Update to Authorizer Wordpress plugin. Solves "Network Super Admin denied access to site" and "All site users (regardless of role) get pending user emails if option not set"

authorizer.php

<?php
/*
Plugin Name: Authorizer
Plugin URI: https://github.com/figureone/authorizer
Description: Authorizer limits login attempts, restricts access to specified users, and authenticates against external sources (e.g., Google, LDAP, or CAS).
Version: 2.6.3
Author: Paul Ryan
Author URI: http://www.linkedin.com/in/paulrryan/
Text Domain: authorizer
Domain Path: /languages
License: GPL2
*/


/*
Copyright 2014  Paul Ryan  (email: prar@hawaii.edu)

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2, as
published by the Free Software Foundation.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/


/*
Portions forked from Restricted Site Access plugin: http://wordpress.org/plugins/restricted-site-access/
Portions forked from wpCAS plugin: http://wordpress.org/extend/plugins/cas-authentication/
Portions forked from Limit Login Attempts: http://wordpress.org/plugins/limit-login-attempts/
*/


define( 'MULTISITE_ADMIN', 'multisite_admin' );
define( 'SINGLE_ADMIN', 'single_admin' );


// Add phpCAS library if it's not included.
// @see https://wiki.jasig.org/display/CASC/phpCAS+installation+guide
if ( ! defined( 'PHPCAS_VERSION' ) ) {
	require_once dirname( __FILE__ ) . '/inc/CAS-1.3.4/CAS.php';
}


if ( ! class_exists( 'WP_Plugin_Authorizer' ) ) {
	/**
	 * Define class for plugin: Authorizer.
	 *
	 * @category Authentication
	 * @package  Authorizer
	 * @author   Paul Ryan <prar@hawaii.edu>
	 * @license  http://www.gnu.org/licenses/gpl-2.0.html GPL2
	 * @link     http://hawaii.edu/coe/dcdc/wordpress/authorizer/doc/
	 */
	class WP_Plugin_Authorizer {


		/**
		 * Constructor.
		 */
		public function __construct() {
			// Installation and uninstallation hooks.
			register_activation_hook( __FILE__, array( $this, 'activate' ) );
			register_deactivation_hook( __FILE__, array( $this, 'deactivate' ) );

			// Register filters.

			// Custom wp authentication routine using external service.
			add_filter( 'authenticate', array( $this, 'custom_authenticate' ), 1, 3 );

			// Custom logout action using external service.
			add_action( 'wp_logout', array( $this, 'custom_logout' ) );

			// Removing this bypasses Wordpress authentication (so if external auth fails,
			// no one can log in); with it enabled, it will run if external auth fails.
			//remove_filter('authenticate', 'wp_authenticate_username_password', 20, 3);

			// Create settings link on Plugins page
			add_filter( 'plugin_action_links_' . plugin_basename( __FILE__ ), array( $this, 'plugin_settings_link' ) );
			add_filter( 'network_admin_plugin_action_links_' . plugin_basename( __FILE__ ), array( $this, 'network_admin_plugin_settings_link' ) );

			// Modify login page with a custom password url (if option is set).
			add_filter( 'lostpassword_url', array( $this, 'custom_lostpassword_url' ) );

			// If we have a custom login error, add the filter to show it.
			$error = get_option( 'auth_settings_advanced_login_error' );
			if ( $error && strlen( $error ) > 0 ) {
				add_filter( 'login_errors', array( $this, 'show_advanced_login_error' ) );
			}

			// Register actions.

			// Enable localization. Translation files stored in /languages.
			add_action( 'plugins_loaded', array( $this, 'load_textdomain' ) );

			// Perform plugin updates if newer version installed.
			add_action( 'plugins_loaded', array( $this, 'auth_update_check' ) );

			// Update the user meta with this user's failed login attempt.
			add_action( 'wp_login_failed', array( $this, 'update_login_failed_count' ) );

			// Add users who successfully login to the approved list.
			add_action( 'wp_login', array( $this, 'ensure_wordpress_user_in_approved_list_on_login' ), 10, 2 );

			// Create menu item in Settings
			add_action( 'admin_menu', array( $this, 'add_plugin_page' ) );

			// Create options page
			add_action( 'admin_init', array( $this, 'page_init' ) );

			// Update user role in approved list if it's changed in the WordPress edit user page.
			add_action( 'edit_user_profile_update', array( $this, 'edit_user_profile_update_role' ) );
			add_action( 'personal_options_update', array( $this, 'edit_user_profile_update_role' ) );

			// Enqueue javascript and css on the plugin's options page, the
			// dashboard (for the widget), and the network admin.
			add_action( 'load-settings_page_authorizer', array( $this, 'load_options_page' ) );
			add_action( 'admin_head-index.php', array( $this, 'load_options_page' ) );
			add_action( 'load-toplevel_page_authorizer', array( $this, 'load_options_page' ) );

			// Add custom css and js to wp-login.php
			add_action( 'login_enqueue_scripts', array( $this, 'login_enqueue_scripts_and_styles' ) );
			add_action( 'login_footer', array( $this, 'load_login_footer_js' ) );

			// Modify login page with external auth links (if enabled; e.g., google or cas)
			add_action( 'login_form', array( $this, 'login_form_add_external_service_links' ) );

			// Redirect to CAS login when visiting login page (only if option is
			// enabled, CAS is the only service, and WordPress logins are hidden).
			add_action( 'login_head', array( $this, 'login_head_maybe_redirect_to_cas' ) );

			// Verify current user has access to page they are visiting
			add_action( 'parse_request', array( $this, 'restrict_access' ), 9 );

			// ajax save options from dashboard widget
			add_action( 'wp_ajax_update_auth_user', array( $this, 'ajax_update_auth_user' ) );

			// ajax save options from multisite options page
			add_action( 'wp_ajax_save_auth_multisite_settings', array( $this, 'ajax_save_auth_multisite_settings' ) );

			// ajax save usermeta from options page
			add_action( 'wp_ajax_update_auth_usermeta', array( $this, 'ajax_update_auth_usermeta' ) );

			// ajax verify google login
			add_action( 'wp_ajax_process_google_login', array( $this, 'ajax_process_google_login' ) );
			add_action( 'wp_ajax_nopriv_process_google_login', array( $this, 'ajax_process_google_login' ) );

			// Add dashboard widget so instructors can add/edit users with access.
			// Hint: For Multisite Network Admin Dashboard use wp_network_dashboard_setup instead of wp_dashboard_setup.
			add_action( 'wp_dashboard_setup', array( $this, 'add_dashboard_widgets' ) );

			// If we have a custom admin message, add the action to show it.
			$notice = get_option( 'auth_settings_advanced_admin_notice' );
			if ( $notice && strlen( $notice ) > 0 ) {
				add_action( 'admin_notices', array( $this, 'show_advanced_admin_notice' ) );
				add_action( 'network_admin_notices', array( $this, 'show_advanced_admin_notice' ) );
			}

			// Load custom javascript for the main site (e.g., for displaying alerts).
			add_action( 'wp_enqueue_scripts', array( $this, 'auth_public_scripts' ), 20 );

			// Multisite-specific actions.
			if ( is_multisite() ) {
				// Add network admin options page (global settings for all sites)
				add_action( 'network_admin_menu', array( $this, 'network_admin_menu' ) );
			}

			// Create login cookie (used by google login)
			if ( ! isset( $_COOKIE['login_unique'] ) ) {
				setcookie( 'login_unique', $this->get_cookie_value(), time()+1800, '/', defined( 'COOKIE_DOMAIN' ) ? COOKIE_DOMAIN : '' );
			}

			// Remove user from authorizer lists when that user is deleted in WordPress.
			add_action( 'delete_user', array( $this, 'remove_user_from_authorizer_when_deleted' ) );
			if ( is_multisite() ) {
				// Remove multisite user from authorizer lists when that user is deleted from Network Users.
				add_action( 'remove_user_from_blog', array( $this, 'remove_network_user_from_site_when_removed' ), 10, 2 );
				add_action( 'wpmu_delete_user', array( $this, 'remove_network_user_from_authorizer_when_deleted' ) );
			}

			// Add user to authorizer approved list when that user is added to a blog from the Users screen.
			// Multisite: invite_user action fired when adding (inviting) an existing network user to the current site (with email confirmation).
			add_action( 'invite_user', array( $this, 'add_existing_user_to_authorizer_when_created' ), 10, 3 );
			// Multisite: added_existing_user action fired when adding an existing network user to the current site (without email confirmation).
			add_action( 'added_existing_user', array( $this, 'add_existing_user_to_authorizer_when_created_noconfirmation' ), 10, 2 );
			// Multisite: after_signup_user action fired when adding a new user to the site (with or without email confirmation).
			add_action( 'after_signup_user', array( $this, 'add_new_user_to_authorizer_when_created' ), 10, 4 );
			// Single site: edit_user_created_user action fired when adding a new user to the site (with or without email notification).
			add_action( 'edit_user_created_user', array( $this, 'add_new_user_to_authorizer_when_created_single_site' ), 10, 2 );

		}


		/**
		 * Plugin activation hook.
		 * Will also activate the plugin for all sites/blogs if this is a "Network enable."
		 *
		 * @return void
		 */
		public function activate() {
			global $wpdb;

			// If we're in a multisite environment, run the plugin activation for each site when network enabling
			if ( is_multisite() && isset( $_GET['networkwide'] ) && $_GET['networkwide'] == 1 ) {

				// Add super admins to the multisite approved list.
				$auth_multisite_settings_access_users_approved = get_blog_option( BLOG_ID_CURRENT_SITE, 'auth_multisite_settings_access_users_approved', array() );
				$should_update_auth_multisite_settings_access_users_approved = false;
				foreach ( get_super_admins() as $super_admin ) {
					$user = get_user_by( 'login', $super_admin );
					// Add to approved list if not there.
					if ( ! $this->in_multi_array( $user->user_email, $auth_multisite_settings_access_users_approved ) ) {
						$approved_user = array(
							'email' => $user->user_email,
							'role' => count( $user->roles ) > 0 ? $user->roles[0] : 'administrator',
							'date_added' => date( 'M Y', strtotime( $user->user_registered ) ),
							'local_user' => true,
						);
						array_push( $auth_multisite_settings_access_users_approved, $approved_user );
						$should_update_auth_multisite_settings_access_users_approved = true;
					}
				}
				if ( $should_update_auth_multisite_settings_access_users_approved ) {
					update_blog_option( BLOG_ID_CURRENT_SITE, 'auth_multisite_settings_access_users_approved', $auth_multisite_settings_access_users_approved );
				}

				// Run plugin activation on each site in the network.
				$current_blog_id = $wpdb->blogid;
				$sites = function_exists( 'get_sites' ) ? get_sites() : wp_get_sites( array( 'limit' => 999999 ) );
				foreach ( $sites as $site ) {
					$blog_id = function_exists( 'get_sites' ) ? $site->blog_id : $site['blog_id'];
					switch_to_blog( $blog_id );
					// Set default plugin options and add current users to approved list.
					$this->set_default_options();
					$this->add_wp_users_to_approved_list();
				}
				switch_to_blog( $current_blog_id );

			} else {
				// Set default plugin options and add current users to approved list.
				$this->set_default_options();
				$this->add_wp_users_to_approved_list();
			}

		}


		/**
		 * Adds all WordPress users in the current site to the approved list,
		 * unless they are already in the blocked list. Also removes them
		 * from the pending list if they are there.
		 *
		 * Runs in plugin activation hook.
		 *
		 * @return void
		 */
		private function add_wp_users_to_approved_list() {
			// Add current WordPress users to the approved list.
			$auth_multisite_settings_access_users_approved = is_multisite() ? get_blog_option( BLOG_ID_CURRENT_SITE, 'auth_multisite_settings_access_users_approved', array() ) : array();
			$auth_settings_access_users_pending = $this->get_plugin_option( 'access_users_pending', SINGLE_ADMIN );
			$auth_settings_access_users_approved = $this->get_plugin_option( 'access_users_approved', SINGLE_ADMIN );
			$auth_settings_access_users_blocked = $this->get_plugin_option( 'access_users_blocked', SINGLE_ADMIN );
			$updated = false;
			foreach ( get_users() as $user ) {
				// Skip if user is in blocked list.
				if ( $this->in_multi_array( $user->user_email, $auth_settings_access_users_blocked ) ) {
					continue;
				}
				// Remove from pending list if there.
				foreach ( $auth_settings_access_users_pending as $key => $pending_user ) {
					if ( $pending_user['email'] == $user->user_email ) {
						unset( $auth_settings_access_users_pending[$key] );
						$updated = true;
					}
				}
				// Skip if user is in multisite approved list.
				if ( $this->in_multi_array( $user->user_email, $auth_multisite_settings_access_users_approved ) ) {
					continue;
				}
				// Add to approved list if not there.
				if ( ! $this->in_multi_array( $user->user_email, $auth_settings_access_users_approved ) ) {
					$approved_user = array(
						'email' => $user->user_email,
						'role' => count( $user->roles ) > 0 ? $user->roles[0] : '',
						'date_added' => date( 'M Y', strtotime( $user->user_registered ) ),
						'local_user' => true,
					);
					array_push( $auth_settings_access_users_approved, $approved_user );
					$updated = true;
				}
			}
			if ( $updated ) {
				update_option( 'auth_settings_access_users_pending', $auth_settings_access_users_pending );
				update_option( 'auth_settings_access_users_approved', $auth_settings_access_users_approved );
			}
		}


		/**
		 * Plugin deactivation.
		 *
		 * @return void
		 */
		public function deactivate() {
			// Do nothing.
		}



		/**
		 * ***************************
		 * External Authentication
		 * ***************************
		 */



		/**
		 * Authenticate against an external service.
		 *
		 * @param WP_User $user     user to authenticate
		 * @param string  $username optional username to authenticate.
		 * @param string  $password optional password to authenticate.
		 *
		 * @return WP_User or WP_Error
		 */
		public function custom_authenticate( $user, $username, $password ) {
			// Pass through if already authenticated.
			if ( is_a( $user, 'WP_User' ) ) {
				return $user;
			} else {
				$user = null;
			}

			// If username and password are blank, this isn't a log in attempt
			$is_login_attempt = strlen( $username ) > 0 && strlen( $password ) > 0;

			// Check to make sure that $username is not locked out due to too
			// many invalid login attempts. If it is, tell the user how much
			// time remains until they can try again.
			$unauthenticated_user = $is_login_attempt ? get_user_by( 'login', $username ) : false;
			$unauthenticated_user_is_blocked = false;
			if ( $is_login_attempt && $unauthenticated_user !== false ) {
				$last_attempt = get_user_meta( $unauthenticated_user->ID, 'auth_settings_advanced_lockouts_time_last_failed', true );
				$num_attempts = get_user_meta( $unauthenticated_user->ID, 'auth_settings_advanced_lockouts_failed_attempts', true );
				// Also check the auth_blocked user_meta flag (users in blocked list will get this flag)
				$unauthenticated_user_is_blocked = get_user_meta( $unauthenticated_user->ID, 'auth_blocked', true ) === 'yes';
			} else {
				$last_attempt = get_option( 'auth_settings_advanced_lockouts_time_last_failed' );
				$num_attempts = get_option( 'auth_settings_advanced_lockouts_failed_attempts' );
			}

			// Inactive users should be treated like deleted users (we just
			// do this to preserve any content they created, but here we should
			// pretend they don't exist).
			if ( $unauthenticated_user_is_blocked ) {
				remove_filter( 'authenticate', 'wp_authenticate_username_password', 20, 3 );
				return new WP_Error( 'empty_password', __( '<strong>ERROR</strong>: Incorrect username or password.', 'authorizer' ) );
			}

			// Grab plugin settings.
			$auth_settings = $this->get_plugin_options( SINGLE_ADMIN, 'allow override' );

			// Make sure $last_attempt (time) and $num_attempts are positive integers.
			// Note: this addresses resetting them if either is unset from above.
			$last_attempt = abs( intval( $last_attempt ) );
			$num_attempts = abs( intval( $num_attempts ) );

			// Create semantic lockout variables.
			$lockouts = $auth_settings['advanced_lockouts'];
			$time_since_last_fail = time() - $last_attempt;
			$reset_duration = $lockouts['reset_duration'] * 60; // minutes to seconds
			$num_attempts_long_lockout = $lockouts['attempts_1'] + $lockouts['attempts_2'];
			$num_attempts_short_lockout = $lockouts['attempts_1'];
			$seconds_remaining_long_lockout = $lockouts['duration_2'] * 60 - $time_since_last_fail;
			$seconds_remaining_short_lockout = $lockouts['duration_1'] * 60 - $time_since_last_fail;

			// Check if we need to institute a lockout delay
			if ( $is_login_attempt && $time_since_last_fail > $reset_duration ) {
				// Enough time has passed since the last invalid attempt and
				// now that we can reset the failed attempt count, and let this
				// login attempt go through.
				$num_attempts = 0; // This does nothing, but include it for semantic meaning.
			} elseif ( $is_login_attempt && $num_attempts > $num_attempts_long_lockout && $seconds_remaining_long_lockout > 0 ) {
				// Stronger lockout (1st/2nd round of invalid attempts reached)
				// Note: set the error code to 'empty_password' so it doesn't
				// trigger the wp_login_failed hook, which would continue to
				// increment the failed attempt count.
				remove_filter( 'authenticate', 'wp_authenticate_username_password', 20, 3 );
				return new WP_Error(
					'empty_password',
					sprintf(
						__( '<strong>ERROR</strong>: There have been too many invalid login attempts for the username <strong>%1$s</strong>. Please wait <strong id="seconds_remaining" data-seconds="%2$s">%3$s</strong> before trying again. <a href="%4$s" title="Password Lost and Found">Lost your password</a>?', 'authorizer' ),
						$username,
						$seconds_remaining_long_lockout,
						$this->seconds_as_sentence( $seconds_remaining_long_lockout ),
						wp_lostpassword_url()
					)
				);
			} elseif ( $is_login_attempt && $num_attempts > $num_attempts_short_lockout && $seconds_remaining_short_lockout > 0 ) {
				// Normal lockout (1st round of invalid attempts reached)
				// Note: set the error code to 'empty_password' so it doesn't
				// trigger the wp_login_failed hook, which would continue to
				// increment the failed attempt count.
				remove_filter( 'authenticate', 'wp_authenticate_username_password', 20, 3 );
				return new WP_Error(
					'empty_password',
					sprintf(
						__( '<strong>ERROR</strong>: There have been too many invalid login attempts for the username <strong>%1$s</strong>. Please wait <strong id="seconds_remaining" data-seconds="%2$s">%3$s</strong> before trying again. <a href="%4$s" title="Password Lost and Found">Lost your password</a>?', 'authorizer' ),
						$username,
						$seconds_remaining_short_lockout,
						$this->seconds_as_sentence( $seconds_remaining_short_lockout ),
						wp_lostpassword_url()
					)
				);
			}

			// Start external authentication.
			$externally_authenticated_emails = array();
			$authenticated_by = '';
			$result = null;

			// Try Google authentication if it's enabled and we don't have a
			// successful login yet.
			if (
				$auth_settings['google'] === '1' &&
				count( $externally_authenticated_emails ) === 0 &&
				! is_wp_error( $result )
			) {
				$result = $this->custom_authenticate_google( $auth_settings );
				if ( ! is_null( $result ) && ! is_wp_error( $result ) ) {
					if ( is_array( $result['email'] ) ) {
						$externally_authenticated_emails = $result['email'];
					} else {
						$externally_authenticated_emails[] = $result['email'];
					}
					$authenticated_by = $result['authenticated_by'];
				}
			}

			// Try CAS authentication if it's enabled and we don't have a
			// successful login yet.
			if (
				$auth_settings['cas'] === '1' &&
				count( $externally_authenticated_emails ) === 0 &&
				! is_wp_error( $result )
			) {
				$result = $this->custom_authenticate_cas( $auth_settings );
				if ( ! is_null( $result ) && ! is_wp_error( $result ) ) {
					if ( is_array( $result['email'] ) ) {
						$externally_authenticated_emails = $result['email'];
					} else {
						$externally_authenticated_emails[] = $result['email'];
					}
					$authenticated_by = $result['authenticated_by'];
				}
			}

			// Try LDAP authentication if it's enabled and we don't have an
			// authenticated user yet.
			if (
				$auth_settings['ldap'] === '1' &&
				count( $externally_authenticated_emails ) === 0 &&
				! is_wp_error( $result )
			) {
				$result = $this->custom_authenticate_ldap( $auth_settings, $username, $password );
				if ( ! is_null( $result ) && ! is_wp_error( $result ) ) {
					if ( is_array( $result['email'] ) ) {
						$externally_authenticated_emails = $result['email'];
					} else {
						$externally_authenticated_emails[] = $result['email'];
					}
					$authenticated_by = $result['authenticated_by'];
				}
			}

			// Skip to WordPress authentication if we don't have an externally
			// authenticated user.
			if ( count( array_filter( $externally_authenticated_emails ) ) < 1 ) {
				return $result;
			}

			// Remove duplicate and blank emails, if any.
			$externally_authenticated_emails = array_filter( array_unique( $externally_authenticated_emails ) );

			// If we've made it this far, we should have an externally
			// authenticated user. The following should be set:
			//   $externally_authenticated_emails
			//   $authenticated_by

			// Get the external user's WordPress account by email address.
			foreach ( $externally_authenticated_emails as $externally_authenticated_email ) {
				$user = get_user_by( 'email', $externally_authenticated_email );

				// If we've already found a WordPress user associated with one
				// of the supplied email addresses, don't keep examining other
				// email addresses associated with the externally authenticated user.
				if ( $user !== FALSE ) {
					break;
				}
			}

			// Check this external user's access against the access lists
			// (pending, approved, blocked)
			$result = $this->check_user_access( $user, $externally_authenticated_emails, $result );

			// Fail with message if there was an error creating/adding the user.
			if ( is_wp_error( $result ) || $result === 0 ) {
				return $result;
			}

			// If we created a new user in check_user_access(), log that user in.
			if ( get_class( $result ) === 'WP_User' ) {
				$user = $result;
			}

			// We'll track how this user was authenticated in user meta.
			if ( $user ) {
				update_user_meta( $user->ID, 'authenticated_by', $authenticated_by );
			}

			// If we haven't exited yet, we have a valid/approved user, so authenticate them.
			return $user;
		}


		/**
		 * This function will fail with a wp_die() message to the user if they
		 * don't have access.
		 *
		 * @param WP_User $user       User to check
		 * @param [type]  $user_emails Array of user's plaintext emails (in case current user doesn't have a WP account)
		 * @param [type]  $user_data Array of keys for email, username, first_name, last_name,
		 *    authenticated_by, google_attributes, cas_attributes, ldap_attributes.
		 * @return  WP_Error if there was an error on user creation / adding user to blog
		 *    wp_die() if user does not have access
		 *    null if user has access (success)
		 *    WP_User if user has access and a new account was created for them
		 */
		private function check_user_access( $user, $user_emails, $user_data = array() ) {
			// Grab plugin settings.
			$auth_settings = $this->get_plugin_options( SINGLE_ADMIN, 'allow override' );

			$auth_settings_access_users_pending = $this->sanitize_user_list(
				$this->get_plugin_option( 'access_users_pending', SINGLE_ADMIN )
			);
			$auth_settings_access_users_approved = $this->sanitize_user_list(
				array_merge(
					$this->get_plugin_option( 'access_users_approved', SINGLE_ADMIN ),
					$this->get_plugin_option( 'access_users_approved', MULTISITE_ADMIN )
				)
			);

			/**
			 * Filter whether to block the currently logging in user based on any of
			 * their user attributes.
			 *
			 * @param bool $user_is_blocked Whether to block the currently logging in user.
			 * @param array $user_data User data returned from external service.
			 */
			$allow_login = apply_filters( 'authorizer_allow_login', true, $user_data );
			if(is_super_admin( $user->ID)){
				$allow_login = true;
			}

			// Check our externally authenticated user against the block list.
			// If they are blocked, set the relevant user meta field, and show
			// them an error screen.
			foreach ( $user_emails as $user_email ) {
				if ( ! $allow_login || $this->is_email_in_list( $user_email, 'blocked' ) ) {

					// Add user to blocked list if it was blocked via the filter.
					if ( ! $allow_login && ! $this->is_email_in_list( $user_email, 'blocked' ) ) {
						$auth_settings_access_users_blocked = $this->sanitize_user_list(
							$this->get_plugin_option( 'access_users_blocked', SINGLE_ADMIN )
						);
						array_push( $auth_settings_access_users_blocked, array(
							'email' => $user_email,
							'date_added' => date( 'M Y' ),
						));
						update_option( 'auth_settings_access_users_blocked', $auth_settings_access_users_blocked );
					}

					// If the blocked external user has a WordPress account, mark it as
					// blocked (enforce block in this->authenticate()).
					if ( $user ) {
						update_user_meta( $user->ID, 'auth_blocked', 'yes' );
					}

					// Notify user about blocked status and return without authenticating them.
					$redirect_to = ! empty( $_REQUEST['redirect_to'] ) ? $_REQUEST['redirect_to'] : home_url();
					$page_title = sprintf(
						/* TRANSLATORS: %s: Name of blog */
						__( '%s - Access Restricted', 'authorizer' ),
						get_bloginfo( 'name' )
					);
					$error_message =
						apply_filters( 'the_content', $auth_settings['access_blocked_redirect_to_message'] ) .
						'<hr />' .
						'<p style="text-align: center;">' .
						'<a class="button" href="' . wp_logout_url( $redirect_to ) . '">' .
						__( 'Back', 'authorizer' ) .
						'</a></p>';
					update_option( 'auth_settings_advanced_login_error', $error_message );
					wp_die( $error_message, $page_title );
				}
			}

			// Get the default role for this new user.
			$default_role = $user && is_array( $user->roles ) && count( $user->roles ) > 0 ? $user->roles[0] : $auth_settings['access_default_role'];
			/**
			 * Filter the role of the user currently logging in. The role will be
			 * set to the default (specified in Authorizer options) for new users,
			 * or the user's current role for existing users. This filter allows
			 * changing user roles based on custom CAS/LDAP attributes.
			 * @param bool $role Role of the user currently logging in.
			 * @param array $user_data User data returned from external service.
			 */
			$approved_role = apply_filters( 'authorizer_custom_role', $default_role, $user_data );

			// Iterate through each of the email addresses provided by the external
			// service and determine if any of them have access.
			$last_email = end( $user_emails );
			reset( $user_emails );
			foreach ( $user_emails as $user_email ) {
				$is_newly_approved_user = false;

				// If this externally authenticated user isn't in the approved list
				// and login access is set to "All authenticated users," add them
				// to the approved list (they'll get an account created below if
				// they don't have one yet).
				if ( (! $this->is_email_in_list( $user_email, 'approved' ) && $auth_settings['access_who_can_login'] === 'external_users')
					// * Added to fix login for super_admin.
					&& !(is_super_admin( $user->ID)) ) {
					$is_newly_approved_user = true;

					// If this user happens to be in the pending list (rare),
					// remove them from pending before adding them to approved.
					if ( $this->is_email_in_list( $user_email, 'pending' ) ) {
						foreach ( $auth_settings_access_users_pending as $key => $pending_user ) {
							if ( $pending_user['email'] === $user_email ) {
								unset( $auth_settings_access_users_pending[ $key ] );
								update_option( 'auth_settings_access_users_pending', $auth_settings_access_users_pending );
								break;
							}
						}
					}

					// Add this user to the approved list.
					$approved_user = array(
						'email' => $user_email,
						'role' => $approved_role,
						'date_added' => date( "Y-m-d H:i:s" ),
					);
					array_push( $auth_settings_access_users_approved, $approved_user );
					update_option( 'auth_settings_access_users_approved', $auth_settings_access_users_approved );
				}

				// Check our externally authenticated user against the approved
				// list. If they are approved, log them in (and create their account
				// if necessary).
				if ( $is_newly_approved_user || $this->is_email_in_list( $user_email, 'approved' )
					// * Added to fix issue with super_admin.
					|| (is_super_admin( $user->ID)) ) {
					$user_info = $is_newly_approved_user ? $approved_user : $this->get_user_info_from_list( $user_email, $auth_settings_access_users_approved );

					// If this user's role was modified above (in the
					// authorizer_custom_role filter), use that value instead of
					// whatever is specified in the approved list.
					if ( $default_role !== $approved_role ) {
						$user_info['role'] = $approved_role;
					}

					// If the approved external user does not have a WordPress account, create it
					if ( ! $user ) {
						// If there's already a user with this username (e.g.,
						// johndoe/johndoe@gmail.com exists, and we're trying to add
						// johndoe/johndoe@example.com), use the full email address
						// as the username.
						if ( array_key_exists( 'username', $user_data ) ) {
							$username = $user_data['username'];
						} else {
							$username = explode( '@', $user_info['email'] );
							$username = $username[0];
						}
						if ( get_user_by( 'login', $username ) !== false ) {
							$username = $approved_user['email'];
						}
						$result = wp_insert_user(
							array(
								'user_login' => strtolower( $username ),
								'user_pass' => wp_generate_password(), // random password
								'first_name' => array_key_exists( 'first_name', $user_data ) ? $user_data['first_name'] : '',
								'last_name' => array_key_exists( 'last_name', $user_data ) ? $user_data['last_name'] : '',
								'user_email' => strtolower( $user_info['email'] ),
								'user_registered' => date( 'Y-m-d H:i:s' ),
								'role' => $user_info['role'],
							)
						);

						// Fail with message if error.
						if ( is_wp_error( $result ) || $result === 0 ) {
							return $result;
						}

						// Authenticate as new user
						$user = new WP_User( $result );

						// If multisite, iterate through all sites in the network and add the user
						// currently logging in to any of them that have the user on the approved list.
						// Note: this is useful for first-time logins--some users will have access
						// to multiple sites, and this prevents them from having to log into each
						// site individually to get access.
						if ( is_multisite() ) {
							$site_ids_of_user = array_map(
								function ( $site_of_user ) { return $site_of_user->userblog_id; },
								get_blogs_of_user( $user->ID )
							);

							$sites = function_exists( 'get_sites' ) ? get_sites() : wp_get_sites( array( 'limit' => 999999 ) );
							foreach ( $sites as $site ) {
								$blog_id = function_exists( 'get_sites' ) ? $site->blog_id : $site['blog_id'];

								// Skip if user is already added to this site.
								if ( in_array( $blog_id, $site_ids_of_user ) ) {
									continue;
								}

								// Check if user is on the approved list of this site they are not added to.
								$other_auth_settings_access_users_approved = get_blog_option( $blog_id, 'auth_settings_access_users_approved', array() );
								if ( $this->in_multi_array( $user->user_email, $other_auth_settings_access_users_approved )
									// * Added to fix issue with super_admin.
									|| is_super_admin( $user->ID) ) {
									$other_user_info = $this->get_user_info_from_list( $user->user_email, $other_auth_settings_access_users_approved );
									// Add user to other site.
									add_user_to_blog( $blog_id, $user->ID, $other_user_info['role'] );
								}
							}
						}

						// Check if this new user has any preassigned usermeta
						// values in their approved list entry, and apply them to
						// their new WordPress account.
						if ( array_key_exists( 'usermeta', $user_info ) && is_array( $user_info['usermeta'] ) ) {
							$meta_key = $this->get_plugin_option( 'advanced_usermeta' );

							if ( array_key_exists( 'meta_key', $user_info['usermeta'] ) && array_key_exists( 'meta_value', $user_info['usermeta'] ) ) {
								// Only update the usermeta if the stored value matches
								// the option set in authorizer settings (if they don't
								// match it's probably old data).
								if ( $meta_key === $user_info['usermeta']['meta_key'] ) {
									// Update user's usermeta value for usermeta key stored in authorizer options.
									if ( strpos( $meta_key, 'acf___' ) === 0 && class_exists( 'acf' ) ) {
										// We have an ACF field value, so use the ACF function to update it.
										update_field( str_replace('acf___', '', $meta_key ), $user_info['usermeta']['meta_value'], 'user_' . $user->ID );
									} else {
										// We have a normal usermeta value, so just update it via the WordPress function.
										update_user_meta( $user->ID, $meta_key, $user_info['usermeta']['meta_value'] );
									}
								}
							} elseif ( is_multisite() && count( $user_info['usermeta'] ) > 0 ) {
								// Update usermeta for each multisite blog defined for this user.
								foreach ( $user_info['usermeta'] as $blog_id => $usermeta ) {
									if ( array_key_exists( 'meta_key', $usermeta ) && array_key_exists( 'meta_value', $usermeta ) ) {
										// Add this new user to the blog before we create their user meta (this step typically happens below, but we need it to happen early so we can create user meta here).
										if ( ! is_user_member_of_blog( $user->ID, $blog_id ) ) {
											add_user_to_blog( $blog_id, $user->ID, $user_info['role'] );
										}
										switch_to_blog( $blog_id );
										// Update user's usermeta value for usermeta key stored in authorizer options.
										if ( strpos( $meta_key, 'acf___' ) === 0 && class_exists( 'acf' ) ) {
											// We have an ACF field value, so use the ACF function to update it.
											update_field( str_replace('acf___', '', $meta_key ), $usermeta['meta_value'], 'user_' . $user->ID );
										} else {
											// We have a normal usermeta value, so just update it via the WordPress function.
											update_user_meta( $user->ID, $meta_key, $usermeta['meta_value'] );
										}
										restore_current_blog();
									}
								}
							}
						}
					} else {
						// Update first/last names of WordPress user from external
						// service if that option is set.
						if ( ( array_key_exists( 'authenticated_by', $user_data ) && $user_data['authenticated_by'] === 'cas' && array_key_exists( 'cas_attr_update_on_login', $auth_settings )  && $auth_settings['cas_attr_update_on_login'] == 1 ) || ( array_key_exists( 'authenticated_by', $user_data ) && $user_data['authenticated_by'] === 'ldap' && array_key_exists( 'ldap_attr_update_on_login', $auth_settings )  && $auth_settings['ldap_attr_update_on_login'] == 1 ) ) {
							if ( array_key_exists( 'first_name', $user_data ) && strlen( $user_data['first_name'] ) > 0 ) {
								wp_update_user( array(
									'ID' => $user->ID,
									'first_name' => $user_data['first_name'],
								));
							}
							if ( array_key_exists( 'last_name', $user_data ) && strlen( $user_data['last_name'] ) > 0 ) {
								wp_update_user( array(
									'ID' => $user->ID,
									'last_name' => $user_data['last_name'],
								));
							}
						}

						// Update this user's role if it was modified in the
						// authorizer_custom_role filter.
						if ( $default_role !== $approved_role ) {
							wp_update_user( array(
								'ID' => $user->ID,
								'role' => $approved_role,
							));
						}
					}

					// If this is multisite, add new user to current blog.
					if ( is_multisite() && ! is_user_member_of_blog( $user->ID ) ) {
						$result = add_user_to_blog( get_current_blog_id(), $user->ID, $user_info['role'] );

						// Fail with message if error.
						if ( is_wp_error( $result ) ) {
							return $result;
						}
					}

					// Ensure user has the same role as their entry in the approved list.
					// (This is just a precaution, the role should already be set when
					// saving admin options in the sanitizing function.)
					if ( $user_info && ! array_key_exists( $user_info['role'], $user->roles ) ) {
						$user->set_role( $user_info['role'] );
					}

					return $user;

				} elseif ( $user && in_array( 'administrator', $user->roles ) ) {
					// User has a WordPress account, but is not in the blocked or approved
					// list. If they are an administrator, let them in.
					return;

				// Note: only do this for the last email address we are checking (we need
				// to iterate through them all to make sure one of them isn't approved).
				} elseif ( $user_email === $last_email ) {
					// User isn't an admin, is not blocked, and is not approved.
					// Add them to the pending list and notify them and their instructor.
					if ( strlen( $user_email ) > 0 && ! $this->is_email_in_list( $user_email, 'pending' ) ) {
						$pending_user = array();
						$pending_user['email'] = $user_email;
						$pending_user['role'] = $approved_role;
						$pending_user['date_added'] = '';
						array_push( $auth_settings_access_users_pending, $pending_user );
						update_option( 'auth_settings_access_users_pending', $auth_settings_access_users_pending );

						// Create strings used in the email notification.
						$site_name = get_bloginfo( 'name' );
						$site_url = get_bloginfo( 'url' );
						$authorizer_options_url = $auth_settings['advanced_admin_menu'] === 'settings' ? admin_url( 'options-general.php?page=authorizer' ) : admin_url( '?page=authorizer' );

						// Notify instructor about new pending user if that option is set.
            // * Added to skip sending emails if no recepient roles defined.
            if(isset($auth_settings['access_role_receive_pending_emails']) && key_exists('access_role_receive_pending_emails', $auth_settings) && !in_array($auth_settings['access_role_receive_pending_emails'], array('---', NULL)) )
						foreach ( get_users( array( 'role' => $auth_settings['access_role_receive_pending_emails'] ) ) as $user_recipient ) {
							wp_mail(
								$user_recipient->user_email,
								sprintf(
									/* TRANSLATORS: 1: User email 2: Name of site */
									__( 'Action required: Pending user %1$s at %2$s', 'authorizer' ),
									$pending_user['email'],
									$site_name
								),
								sprintf(
									/* TRANSLATORS: 1: Name of site 2: URL of site 3: URL of authorizer */
									__( "A new user has tried to access the %1\$s site you manage at:\n%2\$s\n\nPlease log in to approve or deny their request:\n%3\$s\n", 'authorizer' ),
									$site_name,
									$site_url,
									$authorizer_options_url
								)
							);
						}
					}

					// Notify user about pending status and return without authenticating them.
					$redirect_to = ! empty( $_REQUEST['redirect_to'] ) ? $_REQUEST['redirect_to'] : home_url();
					$page_title = get_bloginfo( 'name' ) . ' - Access Pending';
					$error_message =
						apply_filters( 'the_content', $auth_settings['access_pending_redirect_to_message'] ) .
						'<hr />' .
						'<p style="text-align: center;">' .
						'<a class="button" href="' . wp_logout_url( $redirect_to ) . '">' .
						__( 'Back', 'authorizer' ) .
						'</a></p>';
					update_option( 'auth_settings_advanced_login_error', $error_message );
					wp_die( $error_message, $page_title );
				}
			}

			// Sanity check: if we made it here without returning, something has gone wrong.
			return new WP_Error( 'invalid_login', __( 'Invalid login attempted.', 'authorizer' ) );

		}


		/**
		 * Verify the Google login and set a session token.
		 *
		 * Flow: "Sign in with Google" button clicked; JS Google library
		 * called; JS function signInCallback() fired with results from Google;
		 * signInCallback() posts code and nonce (via AJAX) to this function;
		 * This function checks the token using the Google PHP library, and
		 * saves it to a session variable if it's authentic; control passes
		 * back to signInCallback(), which will reload the current page
		 * (wp-login.php) on success; wp-login.php reloads; custom_authenticate
		 * hooked into authenticate action fires again, and
		 * custom_authenticate_google() runs to verify the token; once verified
		 * custom_authenticate proceeds as normal with the google email address
		 * as a successfully authenticated external user.
		 *
		 * @return void, but die with the value to return to the success() function in AJAX call signInCallback()
		 */
		function ajax_process_google_login() {
			$nonce = array_key_exists( 'nonce', $_POST ) ? $_POST['nonce'] : '';
			$code = array_key_exists( 'code', $_POST ) ? $_POST['code'] : null;

			// Nonce check.
			if ( ! wp_verify_nonce( $nonce, 'google_csrf_nonce' ) ) {
				return '';
			}

			// Grab plugin settings.
			$auth_settings = $this->get_plugin_options( SINGLE_ADMIN, 'allow override' );

			// Add Google API PHP Client.
			// @see https://github.com/google/google-api-php-client branch:v1-master
			require_once dirname( __FILE__ ) . '/inc/google-api-php-client/src/Google/autoload.php';

			// Build the Google Client.
			$client = new Google_Client();
			$client->setApplicationName( 'WordPress' );
			$client->setClientId( $auth_settings['google_clientid'] );
			$client->setClientSecret( $auth_settings['google_clientsecret'] );
			$client->setRedirectUri( 'postmessage' );

			// If the hosted domain parameter is set, restrict logins to that domain.
			if ( array_key_exists( 'google_hosteddomain', $auth_settings ) && strlen( $auth_settings['google_hosteddomain'] ) > 0 ) {
				$client->setHostedDomain( $auth_settings['google_hosteddomain'] );
			}

			// Get one time use token (if it doesn't exist, we'll create one below)
			session_start();
			$token = array_key_exists( 'token', $_SESSION ) ? json_decode( $_SESSION['token'] ) : null;

			if ( empty( $token ) ) {
				// Exchange the OAuth 2.0 authorization code for user credentials.
				$client->authenticate( $code );
				$token = json_decode( $client->getAccessToken() );

				// Store the token in the session for later use.
				$_SESSION['token'] = json_encode( $token );

				$response = "Successfully authenticated.";
			} else {
				$client->setAccessToken( json_encode( $token ) );

				$response = 'Already authenticated.';
			}

			die( $response );
		}


		/**
		 * Validate this user's credentials against Google.
		 *
		 * @param array   $auth_settings Plugin settings
		 * @return [mixed] Array containing email, authenticated_by,
		 *                       first_name, last_name, and username
		 *                       strings for the successfully authenticated
		 *                       user, or WP_Error() object on failure,
		 *                       or null if not attempting a google login.
		 */
		private function custom_authenticate_google( $auth_settings ) {
			// Move on if Google auth hasn't been requested here.
			if ( empty( $_GET['external'] ) || $_GET['external'] !== 'google' ) {
				return null;
			}

			// Get one time use token
			session_start();
			$token = array_key_exists( 'token', $_SESSION ) ? json_decode( $_SESSION['token'] ) : null;

			// No token, so this is not a succesful Google login.
			if ( is_null( $token ) ) {
				return null;
			}

			// Add Google API PHP Client.
			// @see https://github.com/google/google-api-php-client branch:v1-master
			require_once dirname( __FILE__ ) . '/inc/google-api-php-client/src/Google/autoload.php';

			// Build the Google Client.
			$client = new Google_Client();
			$client->setApplicationName( 'WordPress' );
			$client->setClientId( $auth_settings['google_clientid'] );
			$client->setClientSecret( $auth_settings['google_clientsecret'] );
			$client->setRedirectUri( 'postmessage' );

			// If the hosted domain parameter is set, restrict logins to that domain.
			if ( array_key_exists( 'google_hosteddomain', $auth_settings ) && strlen( $auth_settings['google_hosteddomain'] ) > 0 ) {
				$client->setHostedDomain( $auth_settings['google_hosteddomain'] );
			}

			// Verify this is a successful Google authentication
			try {
				$ticket = $client->verifyIdToken( $token->id_token, $auth_settings['google_clientid'] );
			} catch ( Google_Auth_Exception $e ) {
				// Invalid ticket, so this in not a successful Google login.
				return new WP_Error( 'invalid_google_login', __( 'Invalid Google credentials provided.', 'authorizer' ) );
			}

			// Invalid ticket, so this in not a successful Google login.
			if ( ! $ticket ) {
				return new WP_Error( 'invalid_google_login', __( 'Invalid Google credentials provided.', 'authorizer' ) );
			}

			// Get email address
			$attributes = $ticket->getAttributes();
			$email = $attributes['payload']['email'];
			$email_domain = substr( strrchr( $email, '@' ), 1 );
			$username = current( explode( '@', $email ) );

			// Fail if hd param is set and the logging in user's email address doesn't
			// match the allowed hosted domain.
			// See: https://developers.google.com/identity/protocols/OpenIDConnect#hd-param
			// See: https://github.com/google/google-api-php-client/blob/v1-master/src/Google/Client.php#L407-L416
			// Note: Will have to upgrade to google-api-php-client v2 or higher for
			// this to function server-side; it's not complete in v1, so this check
			// is only performed here.
			if (
				array_key_exists( 'google_hosteddomain', $auth_settings ) &&
				strlen( $auth_settings['google_hosteddomain'] ) > 0 &&
				$email_domain !== $auth_settings['google_hosteddomain']
			) {
				$this->custom_logout();
				return new WP_Error( 'invalid_google_login', __( 'Google credentials do not match the allowed hosted domain', 'authorizer' ) . ' (' . $auth_settings['google_hosteddomain'] . ').' );
			}


			return array(
				'email' => $email,
				'username' => $username,
				'first_name' => '',
				'last_name' => '',
				'authenticated_by' => 'google',
				'google_attributes' => $attributes,
			);
		}


		/**
		 * Validate this user's credentials against CAS.
		 *
		 * @param array   $auth_settings Plugin settings
		 * @return [mixed] Array containing 'email' and 'authenticated_by'
		 *                       strings for the successfully authenticated
		 *                       user, or WP_Error() object on failure,
		 *                       or null if not attempting a CAS login.
		 */
		private function custom_authenticate_cas( $auth_settings ) {
			// Move on if CAS hasn't been requested here.
			if ( empty( $_GET['external'] ) || $_GET['external'] !== 'cas' ) {
				return null;
			}

			// Get the CAS server version (default to SAML_VERSION_1_1).
			// See: https://developer.jasig.org/cas-clients/php/1.3.4/docs/api/group__public.html
			$cas_version = SAML_VERSION_1_1;
			if ( $auth_settings['cas_version'] === 'CAS_VERSION_3_0' ) {
				$cas_version = CAS_VERSION_3_0;
			} elseif ( $auth_settings['cas_version'] === 'CAS_VERSION_2_0' ) {
				$cas_version = CAS_VERSION_2_0;
			} elseif ( $auth_settings['cas_version'] === 'CAS_VERSION_1_0' ) {
				$cas_version = CAS_VERSION_1_0;
			}

			// Set the CAS client configuration
			phpCAS::client( $cas_version, $auth_settings['cas_host'], intval( $auth_settings['cas_port'] ), $auth_settings['cas_path'] );

			// Update server certificate bundle if it doesn't exist or is older
			// than 3 months, then use it to ensure CAS server is legitimate.
			// Note: only try to update if the system has the php_openssl extension;
			// otherwise the file_get_contents() call will fail (Unable to find the
			// socket transport "ssl").
			$cacert_path = plugin_dir_path( __FILE__ ) . 'inc/cacert.pem';
			$time_90_days = 90 * 24 * 60 * 60; // days * hours * minutes * seconds
			$time_90_days_ago = time() - $time_90_days;
			if (
				extension_loaded( 'openssl' ) &&
				( ! file_exists( $cacert_path ) || filemtime( $cacert_path ) < $time_90_days_ago )
			) {
				$cacert_url = 'https://curl.haxx.se/ca/cacert.pem';

				// If this WordPress install is behind a proxy, use it to retrieve the updated certs.
				if ( defined( 'WP_PROXY_HOST' ) && defined( 'WP_PROXY_PORT' ) ) {
					$context = stream_context_create( array(
						'http' => array(
							'proxy' => 'tcp://' . WP_PROXY_HOST . ':' . WP_PROXY_PORT,
						),
						'ssl' => array(
							'SNI_enabled' => true,
							'SNI_server_name' => parse_url( $cacert_url, PHP_URL_HOST ),
						),
					));
					$cacert_contents = file_get_contents( $cacert_url, false, $context );
				} else {
					$cacert_contents = file_get_contents( $cacert_url );
				}

				// Write out the updated certs to the plugin directory.
				if ( $cacert_contents !== false ) {
					file_put_contents( $cacert_path, $cacert_contents );
				} else {
					return new WP_Error( 'cannot_update_cacert', __( 'Unable to update outdated server certificates from http://curl.haxx.se/ca/cacert.pem.', 'authorizer' ) );
				}
			}
			phpCAS::setCasServerCACert( $cacert_path );

			// Authenticate against CAS
			try {
				if ( ! phpCAS::isAuthenticated() ) {
					phpCAS::forceAuthentication();
					die();
				}
			} catch ( CAS_AuthenticationException $e ) {
				// CAS server threw an error in isAuthenticated(), potentially because
				// the cached ticket is outdated. Try renewing the authentication.
				try {
					phpCAS::renewAuthentication();
				} catch ( CAS_AuthenticationException $e ) {
					error_log( __( 'CAS server returned an Authentication Exception. Details:', 'authorizer' ) );
					error_log( print_r( $e, true ) );

					// CAS server is throwing errors on this login, so try logging the
					// user out of CAS and redirecting them to the login page.
					phpCAS::logoutWithRedirectService( wp_login_url() );
					die();
				}
			}

			// Get username (as specified by the CAS server).
			$username = phpCAS::getUser();

			// If we can't get the logging in user's email address from a CAS attribute,
			// try to guess the domain from the CAS server hostname. This will only be
			// used if we can't discover the email address from CAS attributes.
			$domain_guess = preg_match( '/[^.]*\.[^.]*$/', $auth_settings['cas_host'], $matches ) === 1 ? $matches[0] : '';

			// Get username that successfully authenticated against the external service (CAS).
			$externally_authenticated_email = strtolower( $username ) . '@' . $domain_guess;

			// Retrieve the user attributes (e.g., email address, first name, last name) from the CAS server.
			$cas_attributes = phpCAS::getAttributes();

			// Get user email if it is specified in another field.
			if ( array_key_exists( 'cas_attr_email', $auth_settings ) && strlen( $auth_settings['cas_attr_email'] ) > 0 ) {
				// If the email attribute starts with an at symbol (@), assume that the
				// email domain is manually entered there (instead of a reference to a
				// CAS attribute), and combine that with the username to create the email.
				// Otherwise, look up the CAS attribute for email.
				if ( substr( $auth_settings['cas_attr_email'], 0, 1 ) === '@' ) {
					$externally_authenticated_email = strtolower( $username . $auth_settings['cas_attr_email'] );
				} elseif (
					// If a CAS attribute has been specified as containing the email address, use that instead.
					// Email attribute can be a string or an array of strings.
					array_key_exists( $auth_settings['cas_attr_email'], $cas_attributes ) && (
						(
							is_array( $cas_attributes[$auth_settings['cas_attr_email']] ) &&
							count( $cas_attributes[$auth_settings['cas_attr_email']] ) > 0
						) || (
							is_string( $cas_attributes[$auth_settings['cas_attr_email']] ) &&
							strlen( $cas_attributes[$auth_settings['cas_attr_email']] ) > 0
						)
					)
				) {
					$externally_authenticated_email = $cas_attributes[$auth_settings['cas_attr_email']];
				}
			}

			// Get user first name and last name.
			$first_name = array_key_exists( 'cas_attr_first_name', $auth_settings ) && strlen( $auth_settings['cas_attr_first_name'] ) > 0 && array_key_exists( $auth_settings['cas_attr_first_name'], $cas_attributes ) && strlen( $cas_attributes[$auth_settings['cas_attr_first_name']] ) > 0 ? $cas_attributes[$auth_settings['cas_attr_first_name']] : '';
			$last_name = array_key_exists( 'cas_attr_last_name', $auth_settings ) && strlen( $auth_settings['cas_attr_last_name'] ) > 0 && array_key_exists( $auth_settings['cas_attr_last_name'], $cas_attributes ) && strlen( $cas_attributes[$auth_settings['cas_attr_last_name']] ) > 0 ? $cas_attributes[$auth_settings['cas_attr_last_name']] : '';

			return array(
				'email' => $externally_authenticated_email,
				'username' => $username,
				'first_name' => $first_name,
				'last_name' => $last_name,
				'authenticated_by' => 'cas',
				'cas_attributes' => $cas_attributes,
			);
		}


		/**
		 * Validate this user's credentials against LDAP.
		 *
		 * @param array   $auth_settings Plugin settings
		 * @param string  $username      Attempted username from authenticate action
		 * @param string  $password      Attempted password from authenticate action
		 * @return [mixed] Array containing 'email' and 'authenticated_by'
		 *                       strings for the successfully authenticated
		 *                       user, or WP_Error() object on failure,
		 *                       or null if skipping LDAP auth and falling back to WP auth.
		 */
		private function custom_authenticate_ldap( $auth_settings, $username, $password ) {
			// Get the FQDN from the LDAP search base domain components (dc). For
			// example, ou=people,dc=example,dc=edu,dc=uk would yield user@example.edu.uk
			$search_base_components = explode( ',', trim( $auth_settings['ldap_search_base'] ) );
			$domain = array();
			foreach ( $search_base_components as $search_base_component ) {
				$component = explode( '=', $search_base_component );
				if ( count( $component ) === 2 && $component[0] === 'dc' ) {
					$domain[] = $component[1];
				}
			}
			$domain = implode( '.', $domain );

			// If we can't get the logging in user's email address from an LDAP attribute,
			// just use the domain from the LDAP host. This will only be used if we
			// can't discover the email address from an LDAP attribute.
			if ( empty( $domain ) ) {
				$domain = preg_match( '/[^.]*\.[^.]*$/', $auth_settings['ldap_host'], $matches ) === 1 ? $matches[0] : '';
			}

			// remove @domain if it exists in the username (i.e., if user entered their email)
			$username = str_replace( '@' . $domain, '', $username );

			// Fail with error message if username or password is blank.
			if ( empty( $username ) ) {
				return new WP_Error( 'empty_username', __( 'You must provide a username or email.', 'authorizer' ) );
			}
			if ( empty( $password ) ) {
				return new WP_Error( 'empty_password', __( 'You must provide a password.', 'authorizer' ) );
			}

			// If php5-ldap extension isn't installed on server, fall back to WP auth.
			if ( ! function_exists( 'ldap_connect' ) ) {
				return null;
			}

			// Authenticate against LDAP using options provided in plugin settings.
			$result = false;
			$ldap_user_dn = '';
			$first_name = '';
			$last_name = '';
			$email = '';

			// Establish LDAP connection.
			$ldap = ldap_connect( $auth_settings['ldap_host'], $auth_settings['ldap_port'] );
			ldap_set_option( $ldap, LDAP_OPT_PROTOCOL_VERSION, 3 );
			if ( $auth_settings['ldap_tls'] == 1 ) {
				ldap_start_tls( $ldap );
			}

			// Set bind credentials; attempt an anonymous bind if not provided.
			$bind_rdn = NULL;
			$bind_password = NULL;
			if ( strlen( $auth_settings['ldap_user'] ) > 0 ) {
				$bind_rdn = $auth_settings['ldap_user'];
				$bind_password = $this->decrypt( base64_decode( $auth_settings['ldap_password'] ) );
			}

			// Attempt LDAP bind.
			$result = @ldap_bind( $ldap, $bind_rdn, $bind_password );
			if ( ! $result ) {
				// Can't connect to LDAP, so fall back to WordPress authentication.
				return null;
			}
			// Look up the bind DN (and first/last name) of the user trying to
			// log in by performing an LDAP search for the login username in
			// the field specified in the LDAP settings. This setup is common.
			$ldap_attributes_to_retrieve = array( 'dn' );
			if ( array_key_exists( 'ldap_attr_first_name', $auth_settings ) && strlen( $auth_settings['ldap_attr_first_name'] ) > 0 ) {
				array_push( $ldap_attributes_to_retrieve, $auth_settings['ldap_attr_first_name'] );
			}
			if ( array_key_exists( 'ldap_attr_last_name', $auth_settings ) && strlen( $auth_settings['ldap_attr_last_name'] ) > 0 ) {
				array_push( $ldap_attributes_to_retrieve, $auth_settings['ldap_attr_last_name'] );
			}
			if ( array_key_exists( 'ldap_attr_email', $auth_settings ) && strlen( $auth_settings['ldap_attr_email'] ) > 0 && substr( $auth_settings['ldap_attr_email'], 0, 1 ) !== '@' ) {
				array_push( $ldap_attributes_to_retrieve, $auth_settings['ldap_attr_email'] );
			}
			$ldap_search = ldap_search(
				$ldap,
				$auth_settings['ldap_search_base'],
				"(" . $auth_settings['ldap_uid'] . "=" . $username . ")",
				$ldap_attributes_to_retrieve
			);
			$ldap_entries = ldap_get_entries( $ldap, $ldap_search );

			// If we didn't find any users in ldap, fall back to WordPress authentication.
			if ( $ldap_entries['count'] < 1 ) {
				return null;
			}

			// Get the bind dn and first/last names; if there are multiple results returned, just get the last one.
			for ( $i = 0; $i < $ldap_entries['count']; $i++ ) {
				$ldap_user_dn = $ldap_entries[$i]['dn'];

				// Get user first name and last name.
				if ( array_key_exists( 'ldap_attr_first_name', $auth_settings ) && strlen( $auth_settings['ldap_attr_first_name'] ) > 0 && array_key_exists( $auth_settings['ldap_attr_first_name'], $ldap_entries[$i] ) && $ldap_entries[$i][$auth_settings['ldap_attr_first_name']]['count'] > 0 && strlen( $ldap_entries[$i][$auth_settings['ldap_attr_first_name']][0] ) > 0 ) {
					$first_name = $ldap_entries[$i][$auth_settings['ldap_attr_first_name']][0];
				}
				if ( array_key_exists( 'ldap_attr_last_name', $auth_settings ) && strlen( $auth_settings['ldap_attr_last_name'] ) > 0 && array_key_exists( $auth_settings['ldap_attr_last_name'], $ldap_entries[$i] ) && $ldap_entries[$i][$auth_settings['ldap_attr_last_name']]['count'] > 0 && strlen( $ldap_entries[$i][$auth_settings['ldap_attr_last_name']][0] ) > 0 ) {
					$last_name = $ldap_entries[$i][$auth_settings['ldap_attr_last_name']][0];
				}
				// Get user email if it is specified in another field.
				if ( array_key_exists( 'ldap_attr_email', $auth_settings ) && strlen( $auth_settings['ldap_attr_email'] ) > 0 ) {
					// If the email attribute starts with an at symbol (@), assume that the
					// email domain is manually entered there (instead of a reference to an
					// LDAP attribute), and combine that with the username to create the email.
					// Otherwise, look up the LDAP attribute for email.
					if ( substr( $auth_settings['ldap_attr_email'], 0, 1 ) === '@' ) {
						$email = strtolower( $username . $auth_settings['ldap_attr_email'] );
					} elseif ( array_key_exists( $auth_settings['ldap_attr_email'], $ldap_entries[$i] ) && $ldap_entries[$i][$auth_settings['ldap_attr_email']]['count'] > 0 && strlen( $ldap_entries[$i][$auth_settings['ldap_attr_email']][0] ) > 0 ) {
						$email = strtolower( $ldap_entries[$i][$auth_settings['ldap_attr_email']][0] );
					}
				}
			}

			$result = @ldap_bind( $ldap, $ldap_user_dn, $password );
			if ( ! $result ) {
				// We have a real ldap user, but an invalid password. Pass
				// through to wp authentication after failing LDAP (since
				// this could be a local account that happens to be the
				// same name as an LDAP user).
				return null;
			}

			// User successfully authenticated against LDAP, so set the relevant variables.
			$externally_authenticated_email = $username . '@' . $domain;

			// If an LDAP attribute has been specified as containing the email address, use that instead.
			if ( strlen( $email ) > 0 ) {
				$externally_authenticated_email = $email;
			}

			return array(
				'email' => $externally_authenticated_email,
				'username' => $username,
				'first_name' => $first_name,
				'last_name' => $last_name,
				'authenticated_by' => 'ldap',
				'ldap_attributes' => $ldap_entries,
			);
		}


		/**
		 * Log out of the attached external service.
		 *
		 * @return void
		 */
		public function custom_logout() {
			// Grab plugin settings.
			$auth_settings = $this->get_plugin_options( SINGLE_ADMIN, 'allow override' );

			// Reset option containing old error messages.
			delete_option( 'auth_settings_advanced_login_error' );

			if ( session_id() == '' ) {
				session_start();
			}

			$current_user_authenticated_by = get_user_meta( get_current_user_id(), 'authenticated_by', true );

			// If logged in to CAS, Log out of CAS.
			if ( $current_user_authenticated_by === 'cas' && $auth_settings['cas'] === '1' ) {
				if ( ! array_key_exists( 'PHPCAS_CLIENT', $GLOBALS ) || ! array_key_exists( 'phpCAS', $_SESSION ) ) {

					// Get the CAS server version (default to SAML_VERSION_1_1).
					// See: https://developer.jasig.org/cas-clients/php/1.3.4/docs/api/group__public.html
					$cas_version = SAML_VERSION_1_1;
					if ( $auth_settings['cas_version'] === 'CAS_VERSION_3_0' ) {
						$cas_version = CAS_VERSION_3_0;
					} elseif ( $auth_settings['cas_version'] === 'CAS_VERSION_2_0' ) {
						$cas_version = CAS_VERSION_2_0;
					} elseif ( $auth_settings['cas_version'] === 'CAS_VERSION_1_0' ) {
						$cas_version = CAS_VERSION_1_0;
					}

					// Set the CAS client configuration if it hasn't been set already.
					phpCAS::client( $cas_version, $auth_settings['cas_host'], intval( $auth_settings['cas_port'] ), $auth_settings['cas_path'] );
					// Restrict logout request origin to the CAS server only (prevent DDOS).
					phpCAS::handleLogoutRequests( true, array( $auth_settings['cas_host'] ) );
				}
				if ( phpCAS::isAuthenticated() ) {
					phpCAS::logoutWithRedirectService( get_option( 'siteurl' ) );
				}
			}

			// If session token set, log out of Google.
			if ( $current_user_authenticated_by === 'google' || array_key_exists( 'token', $_SESSION ) ) {
				$token = json_decode( $_SESSION['token'] )->access_token;

				// Add Google API PHP Client.
				// @see https://github.com/google/google-api-php-client branch:v1-master
				require_once dirname( __FILE__ ) . '/inc/google-api-php-client/src/Google/autoload.php';

				// Build the Google Client.
				$client = new Google_Client();
				$client->setApplicationName( 'WordPress' );
				$client->setClientId( $auth_settings['google_clientid'] );
				$client->setClientSecret( $auth_settings['google_clientsecret'] );
				$client->setRedirectUri( 'postmessage' );

				// If the hosted domain parameter is set, restrict logins to that domain.
				if ( array_key_exists( 'google_hosteddomain', $auth_settings ) && strlen( $auth_settings['google_hosteddomain'] ) > 0 ) {
					$client->setHostedDomain( $auth_settings['google_hosteddomain'] );
				}

				// Revoke the token
				$client->revokeToken( $token );

				// Remove the credentials from the user's session.
				unset( $_SESSION['token'] );
			}

		}



		/**
		 * ***************************
		 * Access Restriction
		 * ***************************
		 */



		/**
		 * Restrict access to WordPress site based on settings (everyone, logged_in_users).
		 * Hook: parse_request http://codex.wordpress.org/Plugin_API/Action_Reference/parse_request
		 *
		 * @param array   $wp WordPress object.
		 *
		 * @return void
		 */
		public function restrict_access( $wp ) {
			// Grab plugin settings.
			$auth_settings = $this->get_plugin_options( SINGLE_ADMIN, 'allow override' );

			// Grab current user.
			$current_user = wp_get_current_user();

			$has_access = (
				// Always allow access if WordPress is installing
				( defined( 'WP_INSTALLING' ) && isset( $_GET['key'] ) ) ||
				// Always allow access to admins
				( current_user_can( 'create_users' ) ) ||
				// Allow access if option is set to 'everyone'
				( $auth_settings['access_who_can_view'] == 'everyone' ) ||
				// Allow access to approved external users and logged in users if option is set to 'logged_in_users'
				( $auth_settings['access_who_can_view'] == 'logged_in_users' && $this->is_user_logged_in_and_blog_user() && $this->is_email_in_list( $current_user->user_email, 'approved' ) ) ||
				// Allow access for requests to /wp-json/oauth1 so oauth clients can authenticate to use the REST API
				( property_exists( $wp, 'matched_query' ) && stripos( $wp->matched_query, "rest_oauth1=" ) === 0 ) ||
				// Allow access for non-GET requests to /wp-json/*, since REST API authentication already covers them
				( property_exists( $wp, 'matched_query' ) && stripos( $wp->matched_query, "rest_route=" ) === 0 && $_SERVER['REQUEST_METHOD'] !== 'GET' ) ||
				// Allow access for GET requests to /wp-json/ (root), since REST API discovery calls rely on this
				( property_exists( $wp, 'matched_query' ) && $wp->matched_query === 'rest_route=/' )
				// Note that GET requests to a rest endpoint will be restricted by authorizer. In that case, error messages will be returned as JSON.
			);

			/**
			 * Developers can use the `authorizer_has_access` filter
			 * to override restricted access on certain pages. Note that the
			 * restriction checks happens before WordPress executes any queries, so
			 * use the global `$wp` variable to investigate what the visitor is
			 * trying to load.
			 *
			 * For example, to unblock an RSS feed, place the following PHP code in
			 * the theme's functions.php file or in a simple plug-in:
			 *
			 *   function my_rsa_feed_access_override( $has_access ) {
			 *     global $wp;
			 *     // check query variables to see if this is the feed
			 *     if ( ! empty( $wp->query_vars['feed'] ) )
			 *       $has_access = true;
			 *     return $has_access;
			 *   }
			 *   add_filter( 'authorizer_has_access', 'my_rsa_feed_access_override' );
			 */
			if ( apply_filters( 'authorizer_has_access', $has_access, $wp ) === true ) {
				// Turn off the public notice about browsing anonymously
				update_option( 'auth_settings_advanced_public_notice', false );

				// We've determined that the current user has access, so simply return to grant access.
				return $wp;
			}

			// Allow HEAD requests to the root (usually discovery from a REST client).
			if ( $_SERVER['REQUEST_METHOD'] === 'HEAD' && empty( $wp->request ) && empty( $wp->matched_query ) ) {
				return $wp;
			}

			// We've determined that the current user doesn't have access, so we deal with them now.

			// Fringe case: In a multisite, a user of a different blog can
			// successfully log in, but they aren't on the 'approved' whitelist
			// for this blog. Flag these users, and redirect them to their
			// profile page with a message (so we don't get into a redirect
			// loop on the wp-login.php page).
			if ( is_multisite() && is_user_logged_in() && ! $has_access ) {
				$current_user = wp_get_current_user();

				// Check user access; block if not, add them to pending list if open, let them through otherwise.
				$result = $this->check_user_access( $current_user, array( $current_user->user_email ) );
			}

			// Check to see if the requested page is public. If so, show it.
			$current_page_name = property_exists( $wp, 'query_vars' ) && array_key_exists( 'name', $wp->query_vars ) && strlen( $wp->query_vars['name'] ) > 0 ? $wp->query_vars['name'] : '';
			if ( ! $current_page_name ) {
				// Different WordPress versions store the page slug in different places; look for it elsewhere.
				if ( property_exists( $wp, 'query_vars' ) && array_key_exists( 'pagename', $wp->query_vars ) && strlen( $wp->query_vars['pagename'] ) > 0 ) {
					$current_page_name = $wp->query_vars['pagename'];
				}
			}
			$current_page_id = empty( $wp->request ) ? 'home' : $this->get_id_from_pagename( $current_page_name );
			if ( ! array_key_exists( 'access_public_pages', $auth_settings ) || ! is_array( $auth_settings['access_public_pages'] ) ) {
				$auth_settings['access_public_pages'] = array();
			}
			if ( in_array( $current_page_id, $auth_settings['access_public_pages'] ) ) {
				if ( $auth_settings['access_public_warning'] === 'no_warning' ) {
					update_option( 'auth_settings_advanced_public_notice', false );
				} else {
					update_option( 'auth_settings_advanced_public_notice', true );
				}
				return $wp;
			}

			// Check to see if any category assigned to the requested page is public. If so, show it.
			$current_page_categories = wp_get_post_categories( $current_page_id, array( 'fields' => 'slugs' ) );
			foreach( $current_page_categories as $current_page_category ) {
				if ( in_array( 'cat_' . $current_page_category, $auth_settings['access_public_pages'] ) ) {
					if ( $auth_settings['access_public_warning'] === 'no_warning' ) {
						update_option( 'auth_settings_advanced_public_notice', false );
					} else {
						update_option( 'auth_settings_advanced_public_notice', true );
					}
					return $wp;
				}
			}

			// Check to see if this page can't be found. If so, allow showing the 404 page.
			if ( strlen( $current_page_name ) > 0 && strlen( $current_page_id ) < 1 ) {
				if ( in_array( 'auth_public_404', $auth_settings['access_public_pages'] ) ) {
					if ( $auth_settings['access_public_warning'] === 'no_warning' ) {
						update_option( 'auth_settings_advanced_public_notice', false );
					} else {
						update_option( 'auth_settings_advanced_public_notice', true );
					}
					return $wp;
				}

			}

			// User is denied access, so show them the error message. Render as JSON
			// if this is a REST API call; otherwise, show the error message via
			// wp_die() (rendered html), or redirect to the login URL.
			$current_path = empty( $_SERVER['REQUEST_URI'] ) ? home_url() : $_SERVER['REQUEST_URI'];
			if ( property_exists( $wp, 'matched_query' ) && stripos( $wp->matched_query, "rest_route=" ) === 0 && $_SERVER['REQUEST_METHOD'] === 'GET' ) {
				wp_send_json( array(
					'code' => 'rest_cannot_view',
					'message' => strip_tags( $auth_settings['access_redirect_to_message'] ),
					'data' => array(
						'status' => 401,
					),
				));
			} elseif ( $auth_settings['access_redirect'] === 'message' ) {
				$page_title = sprintf(
					/* TRANSLATORS: %s: Name of blog */
					__( '%s - Access Restricted', 'authorizer' ),
					get_bloginfo( 'name' )
				);
				$error_message =
					apply_filters( 'the_content', $auth_settings['access_redirect_to_message'] ) .
					'<hr />' .
					'<p style="text-align: center;margin-bottom: -15px;">' .
					'<a class="button" href="' . wp_login_url( $current_path ) . '">' .
					__( 'Log In', 'authorizer' ) .
					'</a></p>';
				wp_die( $error_message, $page_title );
			} else { // if ( $auth_settings['access_redirect'] === 'login' ) {
				wp_redirect( wp_login_url( $current_path ), 302 );
				exit;
			}

			// Sanity check: we should never get here
			wp_die( '<p>Access denied.</p>', 'Site Access Restricted' );
		}



		/**
		 * ***************************
		 * Login page (wp-login.php)
		 * ***************************
		 */



		/**
		 * Add custom error message to login screen.
		 * Filter: login_errors
		 */
		function show_advanced_login_error( $errors ) {
			$error = get_option( 'auth_settings_advanced_login_error' );
			delete_option( 'auth_settings_advanced_login_error' );
			$errors = '    ' . $error . "<br />\n";
			return $errors;
		}


		/**
		 * Load external resources for the public-facing site.
		 */
		function auth_public_scripts() {
			// Load (and localize) public scripts
			$current_path = empty( $_SERVER['REQUEST_URI'] ) ? home_url() : $_SERVER['REQUEST_URI'];
			wp_enqueue_script( 'auth_public_scripts', plugins_url( '/js/authorizer-public.js', __FILE__ ), array(), '2.3.2' );
			$auth_localized = array(
				'wp_login_url' => wp_login_url( $current_path ),
				'public_warning' => get_option( 'auth_settings_advanced_public_notice' )
			);
			wp_localize_script( 'auth_public_scripts', 'auth', $auth_localized );
			//update_option( 'auth_settings_advanced_public_notice', false);

			// Load public css
			wp_register_style( 'authorizer-public-css', plugins_url( 'css/authorizer-public.css', __FILE__ ), array(), '2.3.2' );
			wp_enqueue_style( 'authorizer-public-css' );
		}


		/**
		 * Enqueue JS scripts and CSS styles appearing on wp-login.php.
		 *
		 * @return void
		 */
		function login_enqueue_scripts_and_styles() {
			// Grab plugin settings.
			$auth_settings = $this->get_plugin_options( SINGLE_ADMIN, 'allow override' );

			// Enqueue scripts appearing on wp-login.php.
			wp_enqueue_script( 'auth_login_scripts', plugins_url( '/js/authorizer-login.js', __FILE__ ), array( 'jquery' ), '2.3.2' );

			// Enqueue styles appearing on wp-login.php.
			wp_register_style( 'authorizer-login-css', plugins_url( '/css/authorizer-login.css', __FILE__ ), array(), '2.3.2' );
			wp_enqueue_style( 'authorizer-login-css' );

			/**
			 * Developers can use the `authorizer_add_branding_option` filter
			 * to add a radio button for "Custom WordPress login branding"
			 * under the "Advanced" tab in Authorizer options. Example:
			 *
			 * function my_authorizer_add_branding_option( $branding_options ) {
			 *   $new_branding_option = array(
			 *    'value' => 'your_brand'
			 *    'description' => 'Custom Your Brand Login Screen',
			 *    'css_url' => 'http://url/to/your_brand.css',
			 *    'js_url' => 'http://url/to/your_brand.js',
			 *   );
			 *   array_push( $branding_options, $new_branding_option );
			 *   return $branding_options;
			 * }
			 * add_filter( 'authorizer_add_branding_option', 'my_authorizer_add_branding_option' );
			 */
			$branding_options = array();
			$branding_options = apply_filters( 'authorizer_add_branding_option', $branding_options );
			foreach ( $branding_options as $branding_option ) {
				// Make sure the custom brands have the required values
				if ( ! ( is_array( $branding_option ) && array_key_exists( 'value', $branding_option ) && array_key_exists( 'css_url', $branding_option ) && array_key_exists( 'js_url', $branding_option ) ) ) {
					continue;
				}
				if ( $auth_settings['advanced_branding'] === $branding_option['value'] ) {
					wp_enqueue_script( 'auth_login_custom_scripts-' . sanitize_title( $branding_option['value'] ), $branding_option['js_url'], array( 'jquery' ), '2.3.2' );
					wp_register_style( 'authorizer-login-custom-css-' . sanitize_title( $branding_option['value'] ), $branding_option['css_url'], array(), '2.3.2' );
					wp_enqueue_style( 'authorizer-login-custom-css-' . sanitize_title( $branding_option['value'] ) );
				}
			}

			// If we're using Google logins, load those resources.
			if ( $auth_settings['google'] === '1' ) {
				wp_enqueue_script( 'authorizer-login-custom-google', plugins_url( '/js/authorizer-login-custom_google.js', __FILE__ ), array( 'jquery' ), '2.3.2' ); ?>
				<meta name="google-signin-clientid" content="<?php echo $auth_settings['google_clientid']; ?>" />
				<meta name="google-signin-scope" content="email" />
				<meta name="google-signin-cookiepolicy" content="single_host_origin" />
				<?php
			}
		}


		/**
		 * Load external resources in the footer of the wp-login.php page.
		 * Run on action hook: login_footer
		 */
		function load_login_footer_js() {
			// Grab plugin settings.
			$auth_settings = $this->get_plugin_options( SINGLE_ADMIN, 'allow override' ); ?>
			<?php if ( $auth_settings['google'] === '1' ): ?>
				<script type="text/javascript">
					// Reload login page if reauth querystring param exists,
					// since reauth interrupts external logins (e.g., google).
					if ( location.search.indexOf( 'reauth=1' ) >= 0 ) {
						location.href = location.href.replace( 'reauth=1', '' );
					}

					function auth_update_querystring_param( uri, key, value ) {
						var re = new RegExp( '([?&])' + key + '=.*?(&|$)', 'i' );
						var separator = uri.indexOf( '?' ) !== -1 ? '&' : '?';
						if ( uri.match( re ) ) {
							return uri.replace( re, '$1' + key + '=' + value + '$2' );
						} else {
							return uri + separator + key + '=' + value;
						}
					}

					function signInCallback( authResult ) {
						var $ = jQuery;
						if ( authResult['status'] && authResult['status']['signed_in'] ) {
							// Hide the sign-in button now that the user is authorized, for example:
							$( '#googleplus_button' ).attr( 'style', 'display: none' );

							// Send the code to the server
							var ajaxurl = '<?php echo admin_url( "admin-ajax.php" ); ?>';
							$.post(ajaxurl, {
								action: 'process_google_login',
								'code': authResult['code'],
								'nonce': $('#nonce_google_auth-<?php echo $this->get_cookie_value(); ?>' ).val(),
							}, function( response ) {
								// Handle or verify the server response if necessary.
								//console.log( response );

								// Reload wp-login.php to continue the authentication process.
								var new_href = auth_update_querystring_param( location.href, 'external', 'google' );
								if ( location.href === new_href ) {
									location.reload();
								} else {
									location.href = new_href;
								}
							});
						} else {
							// Update the app to reflect a signed out user
							// Possible error values:
							//   "user_signed_out" - User is signed-out
							//   "access_denied" - User denied access to your app
							//   "immediate_failed" - Could not automatically log in the user
							//console.log('Sign-in state: ' + authResult['error']);

							// If user denies access, reload the login page.
							if ( authResult['error'] === 'access_denied' || authResult['error'] === 'user_signed_out' ) {
								window.location.reload();
							}
						}
					}
				</script>
			<?php endif;
		}


		/**
		 * Create links for any external authentication services that are enabled.
		 */
		function login_form_add_external_service_links() {
			// Grab plugin settings.
			$auth_settings = $this->get_plugin_options( SINGLE_ADMIN, 'allow override' ); ?>
			<div id="auth-external-service-login">
				<?php if ( $auth_settings['google'] === '1' ): ?>
					<p><a id="googleplus_button" class="button button-primary button-external button-google"><span class="dashicons dashicons-googleplus"></span><span class="label"><?php _e( 'Sign in with Google', 'authorizer' ); ?></span></a></p>
					<?php wp_nonce_field( 'google_csrf_nonce', 'nonce_google_auth-' . $this->get_cookie_value() ); ?>
				<?php endif; ?>

				<?php if ( $auth_settings['cas'] === '1' ): ?>
					<p><a class="button button-primary button-external button-cas" href="<?php echo $this->modify_current_url_for_cas_login(); ?>">
						<span class="dashicons dashicons-lock"></span>
						<span class="label"><?php
							printf(
								/* TRANSLATORS: %s: Custom CAS label from authorizer options */
								__( 'Sign in with %s', 'authorizer' ),
								$auth_settings['cas_custom_label']
							);
						?></span>
					</a></p>
				<?php endif; ?>

				<?php if ( $auth_settings['advanced_hide_wp_login'] === '1' && strpos( $_SERVER['QUERY_STRING'], 'external=wordpress' ) === false ): ?>
					<style type="text/css">
						#loginform {
							padding-bottom: 8px !important;
						}
						#loginform p>label, #loginform p.forgetmenot, #loginform p.submit, p#nav {
							display: none !important;
						}
					</style>
				<?php elseif ( $auth_settings['cas'] === '1' || $auth_settings['google'] === '1' ): ?>
					<h3> &mdash; <?php _e( 'or', 'authorizer' ); ?> &mdash; </h3>
				<?php endif; ?>
			</div>
			<?php

		}


		/**
		 * Redirect to CAS login when visiting login page (only if option is
		 * enabled, CAS is the only service, and WordPress logins are hidden).
		 */
		function login_head_maybe_redirect_to_cas() {
			// Grab plugin settings.
			$auth_settings = $this->get_plugin_options( SINGLE_ADMIN, 'allow override' );

			// Check whether we should redirect to CAS.
			if (
				strpos( $_SERVER['QUERY_STRING'], 'external=wordpress' ) === false &&
				array_key_exists( 'cas_auto_login', $auth_settings ) && $auth_settings['cas_auto_login'] === '1' &&
				array_key_exists( 'cas', $auth_settings ) && $auth_settings['cas'] === '1' &&
				( ! array_key_exists( 'ldap', $auth_settings ) || $auth_settings['ldap'] !== '1' ) &&
				( ! array_key_exists( 'google', $auth_settings ) || $auth_settings['google'] !== '1' ) &&
				array_key_exists( 'advanced_hide_wp_login', $auth_settings ) && $auth_settings['advanced_hide_wp_login'] === '1'
			) {
				wp_redirect( $this->modify_current_url_for_cas_login() );
				exit;
			}
		}


		/**
		 * Implements hook: do_action( 'wp_login_failed', $username );
		 * Update the user meta for the user that just failed logging in.
		 * Keep track of time of last failed attempt and number of failed attempts.
		 */
		function update_login_failed_count( $username ) {
			// Grab plugin settings.
			$auth_settings = $this->get_plugin_options( SINGLE_ADMIN, 'allow override' );

			// Get user trying to log in.
			// If this isn't a real user, update the global failed attempt
			// variables. We'll use these global variables to institute the
			// lockouts on nonexistent accounts. We do this so an attacker
			// won't be able to determine which accounts are real by which
			// accounts get locked out on multiple invalid attempts.
			$user = get_user_by( 'login', $username );

			if ( $user !== FALSE ) {
				$last_attempt = get_user_meta( $user->ID, 'auth_settings_advanced_lockouts_time_last_failed', true );
				$num_attempts = get_user_meta( $user->ID, 'auth_settings_advanced_lockouts_failed_attempts', true );
			} else {
				$last_attempt = get_option( 'auth_settings_advanced_lockouts_time_last_failed' );
				$num_attempts = get_option( 'auth_settings_advanced_lockouts_failed_attempts' );
			}

			// Make sure $last_attempt (time) and $num_attempts are positive integers.
			// Note: this addresses resetting them if either is unset from above.
			$last_attempt = abs( intval( $last_attempt ) );
			$num_attempts = abs( intval( $num_attempts ) );

			// Reset the failed attempt count if the time since the last
			// failed attempt is greater than the reset duration.
			$time_since_last_fail = time() - $last_attempt;
			$reset_duration = $auth_settings['advanced_lockouts']['reset_duration'] * 60; // minutes to seconds
			if ( $time_since_last_fail > $reset_duration ) {
				$num_attempts = 0;
			}

			// Set last failed time to now and increment last failed count.
			if ( $user !== FALSE ) {
				update_user_meta( $user->ID, 'auth_settings_advanced_lockouts_time_last_failed', time() );
				update_user_meta( $user->ID, 'auth_settings_advanced_lockouts_failed_attempts', $num_attempts + 1 );
			} else {
				update_option( 'auth_settings_advanced_lockouts_time_last_failed', time() );
				update_option( 'auth_settings_advanced_lockouts_failed_attempts', $num_attempts + 1 );
			}
		}


		/**
		 * When they successfully log in, make sure WordPress users are in the approved list.
		 *
		 * @action wp_login
		 *
		 * @param  string $user_login Username of the user logging in.
		 * @param  WP_User $user WP_User object of the user logging in.
		 * @return null
		 */
		function ensure_wordpress_user_in_approved_list_on_login( $user_login, $user ) {
			$this->add_user_to_authorizer_when_created( $user->user_email, $user->user_registered, $user->user_roles );
		}


		/**
		 * Overwrite the URL for the lost password link on the login form.
		 * If we're authenticating against an external service, standard
		 * WordPress password resets won't work.
		 */
		function custom_lostpassword_url( $lostpassword_url ) {
			// Grab plugin settings.
			$auth_settings = $this->get_plugin_options( SINGLE_ADMIN, 'allow override' );

			if (
				array_key_exists( 'ldap_lostpassword_url', $auth_settings ) &&
				filter_var( $auth_settings['ldap_lostpassword_url'], FILTER_VALIDATE_URL )
			) {
				$lostpassword_url = $auth_settings['ldap_lostpassword_url'];
			}
			return $lostpassword_url;
		}



		/**
		 * ***************************
		 * Options page
		 * ***************************
		 */



		/**
		 * Add a link to this plugin's settings page from the WordPress Plugins page.
		 * Called from "plugin_action_links" filter in __construct() above.
		 *
		 * @param array   $links array of links in the admin sidebar
		 *
		 * @return array of links to show in the admin sidebar.
		 */
		public function plugin_settings_link( $links ) {
			$admin_menu = $this->get_plugin_option( 'advanced_admin_menu' );
			$settings_url = $admin_menu === 'settings' ? admin_url( 'options-general.php?page=authorizer' ) : admin_url( 'admin.php?page=authorizer' );
			array_unshift( $links, '<a href="' . $settings_url . '">' . __( 'Settings', 'authorizer' ) . '</a>' );
			return $links;
		}


		/**
		 * Add a link to this plugin's network settings page from the WordPress Plugins page.
		 * Called from "network_admin_plugin_action_links" filter in __construct() above.
		 *
		 * @param array   $links array of links in the network admin sidebar
		 *
		 * @return array of links to show in the network admin sidebar.
		 */
		public function network_admin_plugin_settings_link( $links ) {
			$settings_link = '<a href="admin.php?page=authorizer">' . __( 'Network Settings', 'authorizer' ) . '</a>';
			array_unshift( $links, $settings_link );
			return $links;
		}


		/**
		 * Create the options page under Dashboard > Settings
		 * Run on action hook: admin_menu
		 */
		public function add_plugin_page() {
			$admin_menu = $this->get_plugin_option( 'advanced_admin_menu' );
			if ( $admin_menu === 'settings' ) {
				// @see http://codex.wordpress.org/Function_Reference/add_options_page
				add_options_page(
					'Authorizer', // Page title
					'Authorizer', // Menu title
					'create_users', // Capability
					'authorizer', // Menu slug
					array( $this, 'create_admin_page' ) // function
				);
			} else {
				// @see http://codex.wordpress.org/Function_Reference/add_menu_page
				add_menu_page(
					'Authorizer', // Page title
					'Authorizer', // Menu title
					'create_users', // Capability
					'authorizer', // Menu slug
					array( $this, 'create_admin_page' ), // callback
					'dashicons-groups', // icon
					'99.0018465' // position (decimal is to make overlap with other plugins less likely)
				);
			}
		}


		/**
		 * Output the HTML for the options page
		 */
		public function create_admin_page() { ?>
			<div class="wrap">
				<h2><?php _e( 'Authorizer Settings', 'authorizer' ); ?></h2>
				<form method="post" action="options.php" autocomplete="off"><?php
					// This prints out all hidden settings fields
					// @see http://codex.wordpress.org/Function_Reference/settings_fields
					settings_fields( 'auth_settings_group' );
					// This prints out all the sections
					// @see http://codex.wordpress.org/Function_Reference/do_settings_sections
					do_settings_sections( 'authorizer' );
					submit_button(); ?>
				</form>
			</div><?php
		}


		/**
		 * Load external resources on this plugin's options page.
		 * Run on action hooks: load-settings_page_authorizer, load-toplevel_page_authorizer, admin_head-index.php
		 */
		public function load_options_page() {
			wp_enqueue_script(
				'authorizer',
				plugins_url( 'js/authorizer.js', __FILE__ ),
				array( 'jquery-effects-shake' ), '2.3.2', true
			);
			wp_localize_script( 'authorizer', 'auth_L10n', array(
				'baseurl' => get_bloginfo( 'url' ),
				'saved' => esc_html__( 'Saved', 'authorizer' ),
				'failed' => esc_html__( 'Failed', 'authorizer' ),
				'local_wordpress_user' => esc_html__( 'Local WordPress user', 'authorizer' ),
				'block_ban_user' => esc_html__( 'Block/Ban user', 'authorizer' ),
				'remove_user' => esc_html__( 'Remove user', 'authorizer' ),
				'no_users_in' => esc_html__( 'No users in', 'authorizer' ),
				'save_changes' => esc_html__( 'Save Changes', 'authorizer' ),
				'private_pages' => esc_html__( 'Private Pages', 'authorizer' ),
				'public_pages' => esc_html__( 'Public Pages', 'authorizer' ),
			));

			wp_enqueue_script(
				'jquery.multi-select',
				plugins_url( 'inc/jquery.multi-select/js/jquery.multi-select.js', __FILE__ ),
				array( 'jquery' ), '1.8', true
			);

			wp_register_style( 'authorizer-css', plugins_url( 'css/authorizer.css', __FILE__ ), array(), '2.3.2' );
			wp_enqueue_style( 'authorizer-css' );

			wp_register_style( 'jquery-multi-select-css', plugins_url( 'inc/jquery.multi-select/css/multi-select.css', __FILE__ ), array(), '1.8' );
			wp_enqueue_style( 'jquery-multi-select-css' );

			add_action( 'admin_notices', array( $this, 'admin_notices' ) ); // Add any notices to the top of the options page.
			add_action( 'admin_head', array( $this, 'admin_head' ) ); // Add help documentation to the options page.
		}


		/**
		 * Show custom admin notice.
		 * Filter: admin_notice
		 */
		function show_advanced_admin_notice() {
			$notice = get_option( 'auth_settings_advanced_admin_notice' );
			delete_option( 'auth_settings_advanced_admin_notice' );

			if ( $notice && strlen( $notice ) > 0 ) { ?>
				<div class="error">
					<p><?php echo $notice; ?></p>
				</div><?php
			}
		}


		/**
		 * Add notices to the top of the options page.
		 * Run on action hook chain: load-settings_page_authorizer > admin_notices
		 * Description: Check for invalid settings combinations and show a warning message, e.g.:
		 *   if ( cas url inaccessible ) : ?>
		 *     <div class='updated settings-error'><p>Can't reach CAS server.</p></div>
		 *   <?php endif;
		 */
		public function admin_notices() {
			// Grab plugin settings.
			$auth_settings = $this->get_plugin_options( SINGLE_ADMIN, 'allow override' );

			if ( $auth_settings['cas'] === '1' ) :
				// Check if provided CAS URL is accessible.
				$protocol = in_array( $auth_settings['cas_port'], array( '80', '8080' ) ) ? 'http' : 'https';
				if ( ! $this->url_is_accessible( $protocol . '://' . $auth_settings['cas_host'] . ':' . $auth_settings['cas_port'] . $auth_settings['cas_path'] ) ) :
					$authorizer_options_url = $auth_settings['advanced_admin_menu'] === 'settings' ? admin_url( 'options-general.php?page=authorizer' ) : admin_url( '?page=authorizer' );
					?><div class='notice notice-warning is-dismissible'>
						<p><?php _e( "Can't reach CAS server. Please provide", 'authorizer' ); ?> <a href='<?php echo $authorizer_options_url; ?>&tab=external'><?php _e( 'accurate CAS settings', 'authorizer' ); ?></a> <?php _e( 'if you intend to use it.', 'authorizer' ); ?></p>
					</div><?php
				endif;
			endif;
		}


		/**
		 * Create sections and options
		 * Run on action hook: admin_init
		 */
		public function page_init() {
			// Create one setting that holds all the options (array)
			// @see http://codex.wordpress.org/Function_Reference/register_setting
			// @see http://codex.wordpress.org/Function_Reference/add_settings_section
			// @see http://codex.wordpress.org/Function_Reference/add_settings_field
			register_setting(
				'auth_settings_group', // Option group
				'auth_settings', // Option name
				array( $this, 'sanitize_options' ) // Sanitize callback
			);

			add_settings_section(
				'auth_settings_tabs', // HTML element ID
				'', // HTML element Title
				array( $this, 'print_section_info_tabs' ), // Callback (echos section content)
				'authorizer' // Page this section is shown on (slug)
			);

			// Create Access Lists section
			add_settings_section(
				'auth_settings_lists', // HTML element ID
				'', // HTML element Title
				array( $this, 'print_section_info_access_lists' ), // Callback (echos section content)
				'authorizer' // Page this section is shown on (slug)
			);

			// Create Login Access section
			add_settings_section(
				'auth_settings_access_login', // HTML element ID
				'', // HTML element Title
				array( $this, 'print_section_info_access_login' ), // Callback (echos section content)
				'authorizer' // Page this section is shown on (slug)
			);
			add_settings_field(
				'auth_settings_access_who_can_login', // HTML element ID
				__( 'Who can log into the site?', 'authorizer' ), // HTML element Title
				array( $this, 'print_radio_auth_access_who_can_login' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_access_login' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_access_role_receive_pending_emails', // HTML element ID
				__( 'Which role should receive email notifications about pending users?', 'authorizer' ), // HTML element Title
				array( $this, 'print_select_auth_access_role_receive_pending_emails' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_access_login' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_access_pending_redirect_to_message', // HTML element ID
				__( 'What message should pending users see after attempting to log in?', 'authorizer' ), // HTML element Title
				array( $this, 'print_wysiwyg_auth_access_pending_redirect_to_message' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_access_login' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_access_blocked_redirect_to_message', // HTML element ID
				__( 'What message should blocked users see after attempting to log in?', 'authorizer' ), // HTML element Title
				array( $this, 'print_wysiwyg_auth_access_blocked_redirect_to_message' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_access_login' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_access_should_email_approved_users', // HTML element ID
				__( 'Send welcome email to new approved users?', 'authorizer' ), // HTML element Title
				array( $this, 'print_checkbox_auth_access_should_email_approved_users' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_access_login' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_access_email_approved_users_subject', // HTML element ID
				__( 'Welcome email subject', 'authorizer' ), // HTML element Title
				array( $this, 'print_text_auth_access_email_approved_users_subject' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_access_login' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_access_email_approved_users_body', // HTML element ID
				__( 'Welcome email body', 'authorizer' ), // HTML element Title
				array( $this, 'print_wysiwyg_auth_access_email_approved_users_body' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_access_login' // Section this setting is shown on
			);


			// Create Public Access section
			add_settings_section(
				'auth_settings_access_public', // HTML element ID
				'', // HTML element Title
				array( $this, 'print_section_info_access_public' ), // Callback (echos section content)
				'authorizer' // Page this section is shown on (slug)
			);
			add_settings_field(
				'auth_settings_access_who_can_view', // HTML element ID
				__( 'Who can view the site?', 'authorizer' ), // HTML element Title
				array( $this, 'print_radio_auth_access_who_can_view' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_access_public' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_access_public_pages', // HTML element ID
				__( 'What pages (if any) should be available to everyone?', 'authorizer' ), // HTML element Title
				array( $this, 'print_multiselect_auth_access_public_pages' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_access_public' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_access_redirect', // HTML element ID
				__( 'What happens to people without access when they visit a private page?', 'authorizer' ), // HTML element Title
				array( $this, 'print_radio_auth_access_redirect' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_access_public' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_access_public_warning', // HTML element ID
				__( 'What happens to people without access when they visit a public page?', 'authorizer' ), // HTML element Title
				array( $this, 'print_radio_auth_access_public_warning' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_access_public' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_access_redirect_to_message', // HTML element ID
				__( 'What message should people without access see?', 'authorizer' ), // HTML element Title
				array( $this, 'print_wysiwyg_auth_access_redirect_to_message' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_access_public' // Section this setting is shown on
			);

			// Create External Service Settings section
			add_settings_section(
				'auth_settings_external', // HTML element ID
				'', // HTML element Title
				array( $this, 'print_section_info_external' ), // Callback (echos section content)
				'authorizer' // Page this section is shown on (slug)
			);
			add_settings_field(
				'auth_settings_access_default_role', // HTML element ID
				__( 'Default role for new users', 'authorizer' ), // HTML element Title
				array( $this, 'print_select_auth_access_default_role' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_external' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_external_google', // HTML element ID
				__( 'Google Logins', 'authorizer' ), // HTML element Title
				array( $this, 'print_checkbox_auth_external_google' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_external' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_google_clientid', // HTML element ID
				__( 'Google Client ID', 'authorizer' ), // HTML element Title
				array( $this, 'print_text_google_clientid' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_external' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_google_clientsecret', // HTML element ID
				__( 'Google Client Secret', 'authorizer' ), // HTML element Title
				array( $this, 'print_text_google_clientsecret' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_external' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_google_hosteddomain', // HTML element ID
				__( 'Google Hosted Domain', 'authorizer' ), // HTML element Title
				array( $this, 'print_text_google_hosteddomain' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_external' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_external_cas', // HTML element ID
				__( 'CAS Logins', 'authorizer' ), // HTML element Title
				array( $this, 'print_checkbox_auth_external_cas' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_external' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_cas_custom_label', // HTML element ID
				__( 'CAS custom label', 'authorizer' ), // HTML element Title
				array( $this, 'print_text_cas_custom_label' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_external' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_cas_host', // HTML element ID
				__( 'CAS server hostname', 'authorizer' ), // HTML element Title
				array( $this, 'print_text_cas_host' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_external' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_cas_port', // HTML element ID
				__( 'CAS server port', 'authorizer' ), // HTML element Title
				array( $this, 'print_text_cas_port' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_external' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_cas_path', // HTML element ID
				__( 'CAS server path/context', 'authorizer' ), // HTML element Title
				array( $this, 'print_text_cas_path' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_external' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_cas_version', // HTML element ID
				'CAS server version', // HTML element Title
				array( $this, 'print_select_cas_version' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_external' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_cas_attr_email', // HTML element ID
				__( 'CAS attribute containing email address', 'authorizer' ), // HTML element Title
				array( $this, 'print_text_cas_attr_email' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_external' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_cas_attr_first_name', // HTML element ID
				__( 'CAS attribute containing first name', 'authorizer' ), // HTML element Title
				array( $this, 'print_text_cas_attr_first_name' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_external' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_cas_attr_last_name', // HTML element ID
				__( 'CAS attribute containing last name', 'authorizer' ), // HTML element Title
				array( $this, 'print_text_cas_attr_last_name' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_external' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_cas_attr_update_on_login', // HTML element ID
				__( 'CAS attribute update', 'authorizer' ), // HTML element Title
				array( $this, 'print_checkbox_cas_attr_update_on_login' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_external' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_cas_auto_login', // HTML element ID
				__( 'CAS automatic login', 'authorizer' ), // HTML element Title
				array( $this, 'print_checkbox_cas_auto_login' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_external' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_external_ldap', // HTML element ID
				__( 'LDAP Logins', 'authorizer' ), // HTML element Title
				array( $this, 'print_checkbox_auth_external_ldap' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_external' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_ldap_host', // HTML element ID
				__( 'LDAP Host', 'authorizer' ), // HTML element Title
				array( $this, 'print_text_ldap_host' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_external' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_ldap_port', // HTML element ID
				__( 'LDAP Port', 'authorizer' ), // HTML element Title
				array( $this, 'print_text_ldap_port' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_external' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_ldap_search_base', // HTML element ID
				__( 'LDAP Search Base', 'authorizer' ), // HTML element Title
				array( $this, 'print_text_ldap_search_base' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_external' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_ldap_uid', // HTML element ID
				__( 'LDAP attribute containing username', 'authorizer' ), // HTML element Title
				array( $this, 'print_text_ldap_uid' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_external' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_ldap_attr_email', // HTML element ID
				__( 'LDAP attribute containing email address', 'authorizer' ), // HTML element Title
				array( $this, 'print_text_ldap_attr_email' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_external' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_ldap_user', // HTML element ID
				__( 'LDAP Directory User', 'authorizer' ), // HTML element Title
				array( $this, 'print_text_ldap_user' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_external' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_ldap_password', // HTML element ID
				__( 'LDAP Directory User Password', 'authorizer' ), // HTML element Title
				array( $this, 'print_password_ldap_password' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_external' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_ldap_tls', // HTML element ID
				__( 'Secure Connection (TLS)', 'authorizer' ), // HTML element Title
				array( $this, 'print_checkbox_ldap_tls' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_external' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_ldap_lostpassword_url', // HTML element ID
				__( 'Custom lost password URL', 'authorizer' ), // HTML element Title
				array( $this, 'print_text_ldap_lostpassword_url' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_external' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_ldap_attr_first_name', // HTML element ID
				__( 'LDAP attribute containing first name', 'authorizer' ), // HTML element Title
				array( $this, 'print_text_ldap_attr_first_name' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_external' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_ldap_attr_last_name', // HTML element ID
				__( 'LDAP attribute containing last name', 'authorizer' ), // HTML element Title
				array( $this, 'print_text_ldap_attr_last_name' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_external' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_ldap_attr_update_on_login', // HTML element ID
				__( 'LDAP attribute update', 'authorizer' ), // HTML element Title
				array( $this, 'print_checkbox_ldap_attr_update_on_login' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_external' // Section this setting is shown on
			);

			// Create Advanced Settings section
			add_settings_section(
				'auth_settings_advanced', // HTML element ID
				'', // HTML element Title
				array( $this, 'print_section_info_advanced' ), // Callback (echos section content)
				'authorizer' // Page this section is shown on (slug)
			);
			add_settings_field(
				'auth_settings_advanced_lockouts', // HTML element ID
				__( 'Limit invalid login attempts', 'authorizer' ), // HTML element Title
				array( $this, 'print_text_auth_advanced_lockouts' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_advanced' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_advanced_hide_wp_login', // HTML element ID
				__( 'Hide WordPress Login', 'authorizer' ), // HTML element Title
				array( $this, 'print_checkbox_auth_advanced_hide_wp_login' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_advanced' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_advanced_branding', // HTML element ID
				__( 'Custom WordPress login branding', 'authorizer' ), // HTML element Title
				array( $this, 'print_radio_auth_advanced_branding' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_advanced' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_advanced_admin_menu', // HTML element ID
				__( 'Authorizer admin menu item location', 'authorizer' ), // HTML element Title
				array( $this, 'print_radio_auth_advanced_admin_menu' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_advanced' // Section this setting is shown on
			);
			add_settings_field(
				'auth_settings_advanced_usermeta', // HTML element ID
				__( 'Show custom usermeta in user list', 'authorizer' ), // HTML element Title
				array( $this, 'print_select_auth_advanced_usermeta' ), // Callback (echos form element)
				'authorizer', // Page this setting is shown on (slug)
				'auth_settings_advanced' // Section this setting is shown on
			);
			// On multisite installs, add an option to override all multisite settings on individual sites.
			if ( is_multisite() ) {
				add_settings_field(
					'auth_settings_advanced_override_multisite', // HTML element ID
					__( 'Override multisite options', 'authorizer' ), // HTML element Title
					array( $this, 'print_checkbox_auth_advanced_override_multisite' ), // Callback (echos form element)
					'authorizer', // Page this setting is shown on (slug)
					'auth_settings_advanced' // Section this setting is shown on
				);
			}
		}


		/**
		 * Set meaningful defaults for the plugin options.
		 * Note: This function is called on plugin activation.
		 */
		function set_default_options() {
			global $wp_roles;

			$auth_settings = get_option( 'auth_settings' );
			if ( $auth_settings === FALSE ) {
				$auth_settings = array();
			}

			// Access Lists Defaults.
			$auth_settings_access_users_pending = get_option( 'auth_settings_access_users_pending' );
			if ( $auth_settings_access_users_pending === FALSE ) {
				$auth_settings_access_users_pending = array();
			}
			$auth_settings_access_users_approved = get_option( 'auth_settings_access_users_approved' );
			if ( $auth_settings_access_users_approved === FALSE ) {
				$auth_settings_access_users_approved = array();
			}
			$auth_settings_access_users_blocked = get_option( 'auth_settings_access_users_blocked' );
			if ( $auth_settings_access_users_blocked === FALSE ) {
				$auth_settings_access_users_blocked = array();
			}

			// Login Access Defaults.
			if ( ! array_key_exists( 'access_who_can_login', $auth_settings ) ) {
				$auth_settings['access_who_can_login'] = 'approved_users';
			}
			if ( ! array_key_exists( 'access_role_receive_pending_emails', $auth_settings ) ) {
				$auth_settings['access_role_receive_pending_emails'] = '---';
			}
			if ( ! array_key_exists( 'access_pending_redirect_to_message', $auth_settings ) ) {
				$auth_settings['access_pending_redirect_to_message'] = '<p>' . __( "You're not currently allowed to view this site. Your administrator has been notified, and once he/she has approved your request, you will be able to log in. If you need any other help, please contact your administrator.", 'authorizer' ) . '</p>';
			}
			if ( ! array_key_exists( 'access_blocked_redirect_to_message', $auth_settings ) ) {
				$auth_settings['access_blocked_redirect_to_message'] = '<p>' . __( "You're not currently allowed to log into this site. If you think this is a mistake, please contact your administrator.", 'authorizer' ) . '</p>';
			}
			if ( ! array_key_exists( 'access_should_email_approved_users', $auth_settings ) ) {
				$auth_settings['access_should_email_approved_users'] = '';
			}
			if ( ! array_key_exists( 'access_email_approved_users_subject', $auth_settings ) ) {
				$auth_settings['access_email_approved_users_subject'] = sprintf(
					/* TRANSLATORS: %s: Shortcode for name of site */
					__( 'Welcome to %s!', 'authorizer' ),
					'[site_name]'
				);
			}
			if ( ! array_key_exists( 'access_email_approved_users_body', $auth_settings ) ) {
				$auth_settings['access_email_approved_users_body'] = sprintf(
					/* TRANSLATORS: 1: Shortcode for user email 2: Shortcode for site name 3: Shortcode for site URL */
					__( "Hello %1\$s,\nWelcome to %2\$s! You now have access to all content on the site. Please visit us here:\n%3\$s\n", 'authorizer' ),
					'[user_email]',
					'[site_name]',
					'[site_url]'
				);
			}

			// Public Access to Private Page Defaults.
			if ( ! array_key_exists( 'access_who_can_view', $auth_settings ) ) {
				$auth_settings['access_who_can_view'] = 'everyone';
			}
			if ( ! array_key_exists( 'access_public_pages', $auth_settings ) ) {
				$auth_settings['access_public_pages'] = array();
			}
			if ( ! array_key_exists( 'access_redirect', $auth_settings ) ) {
				$auth_settings['access_redirect'] = 'login';
			}
			if ( ! array_key_exists( 'access_public_warning', $auth_settings ) ) {
				$auth_settings['access_public_warning'] = 'no_warning';
			}
			if ( ! array_key_exists( 'access_redirect_to_message', $auth_settings ) ) {
				$auth_settings['access_redirect_to_message'] = '<p>' . __( 'Notice: You are browsing this site anonymously, and only have access to a portion of its content.', 'authorizer' ) . '</p>';
			}


			// External Service Defaults.
			if ( ! array_key_exists( 'access_default_role', $auth_settings ) ) {
				// Set default role to 'student' if that role exists, 'subscriber' otherwise.
				$all_roles = $wp_roles->roles;
				$editable_roles = apply_filters( 'editable_roles', $all_roles );
				if ( array_key_exists( 'student', $editable_roles ) ) {
					$auth_settings['access_default_role'] = 'student';
				} else {
					$auth_settings['access_default_role'] = 'subscriber';
				}
			}

			if ( ! array_key_exists( 'google', $auth_settings ) ) {
				$auth_settings['google'] = '';
			}
			if ( ! array_key_exists( 'cas', $auth_settings ) ) {
				$auth_settings['cas'] = '';
			}
			if ( ! array_key_exists( 'ldap', $auth_settings ) ) {
				$auth_settings['ldap'] = '';
			}

			if ( ! array_key_exists( 'google_clientid', $auth_settings ) ) {
				$auth_settings['google_clientid'] = '';
			}
			if ( ! array_key_exists( 'google_clientsecret', $auth_settings ) ) {
				$auth_settings['google_clientsecret'] = '';
			}
			if ( ! array_key_exists( 'google_hosteddomain', $auth_settings ) ) {
				$auth_settings['google_hosteddomain'] = '';
			}

			if ( ! array_key_exists( 'cas_custom_label', $auth_settings ) ) {
				$auth_settings['cas_custom_label'] = 'CAS';
			}
			if ( ! array_key_exists( 'cas_host', $auth_settings ) ) {
				$auth_settings['cas_host'] = '';
			}
			if ( ! array_key_exists( 'cas_port', $auth_settings ) ) {
				$auth_settings['cas_port'] = '';
			}
			if ( ! array_key_exists( 'cas_path', $auth_settings ) ) {
				$auth_settings['cas_path'] = '';
			}
			if ( ! array_key_exists( 'cas_version', $auth_settings ) ) {
				$auth_settings['cas_version'] = 'SAML_VERSION_1_1';
			}
			if ( ! array_key_exists( 'cas_attr_email', $auth_settings ) ) {
				$auth_settings['cas_attr_email'] = '';
			}
			if ( ! array_key_exists( 'cas_attr_first_name', $auth_settings ) ) {
				$auth_settings['cas_attr_first_name'] = '';
			}
			if ( ! array_key_exists( 'cas_attr_last_name', $auth_settings ) ) {
				$auth_settings['cas_attr_last_name'] = '';
			}
			if ( ! array_key_exists( 'cas_attr_update_on_login', $auth_settings ) ) {
				$auth_settings['cas_attr_update_on_login'] = '';
			}
			if ( ! array_key_exists( 'cas_auto_login', $auth_settings ) ) {
				$auth_settings['cas_auto_login'] = '';
			}

			if ( ! array_key_exists( 'ldap_host', $auth_settings ) ) {
				$auth_settings['ldap_host'] = '';
			}
			if ( ! array_key_exists( 'ldap_port', $auth_settings ) ) {
				$auth_settings['ldap_port'] = '389';
			}
			if ( ! array_key_exists( 'ldap_search_base', $auth_settings ) ) {
				$auth_settings['ldap_search_base'] = '';
			}
			if ( ! array_key_exists( 'ldap_uid', $auth_settings ) ) {
				$auth_settings['ldap_uid'] = 'uid';
			}
			if ( ! array_key_exists( 'ldap_attr_email', $auth_settings ) ) {
				$auth_settings['ldap_attr_email'] = '';
			}
			if ( ! array_key_exists( 'ldap_user', $auth_settings ) ) {
				$auth_settings['ldap_user'] = '';
			}
			if ( ! array_key_exists( 'ldap_password', $auth_settings ) ) {
				$auth_settings['ldap_password'] = '';
			}
			if ( ! array_key_exists( 'ldap_tls', $auth_settings ) ) {
				$auth_settings['ldap_tls'] = '1';
			}
			if ( ! array_key_exists( 'ldap_lostpassword_url', $auth_settings ) ) {
				$auth_settings['ldap_lostpassword_url'] = '';
			}
			if ( ! array_key_exists( 'ldap_attr_first_name', $auth_settings ) ) {
				$auth_settings['ldap_attr_first_name'] = '';
			}
			if ( ! array_key_exists( 'ldap_attr_last_name', $auth_settings ) ) {
				$auth_settings['ldap_attr_last_name'] = '';
			}
			if ( ! array_key_exists( 'ldap_attr_update_on_login', $auth_settings ) ) {
				$auth_settings['ldap_attr_update_on_login'] = '';
			}

			// Advanced defaults.
			if ( ! array_key_exists( 'advanced_lockouts', $auth_settings ) ) {
				$auth_settings['advanced_lockouts'] = array(
					'attempts_1' => 10,
					'duration_1' => 1,
					'attempts_2' => 10,
					'duration_2' => 10,
					'reset_duration' => 120,
				);
			}
			if ( ! array_key_exists( 'advanced_hide_wp_login', $auth_settings ) ) {
				$auth_settings['advanced_hide_wp_login'] = '';
			}
			if ( ! array_key_exists( 'advanced_branding', $auth_settings ) ) {
				$auth_settings['advanced_branding'] = 'default';
			}
			if ( ! array_key_exists( 'advanced_admin_menu', $auth_settings ) ) {
				$auth_settings['advanced_admin_menu'] = 'top';
			}
			if ( ! array_key_exists( 'advanced_usermeta', $auth_settings ) ) {
				$auth_settings['advanced_usermeta'] = '';
			}
			if ( ! array_key_exists( 'advanced_override_multisite', $auth_settings ) ) {
				$auth_settings['advanced_override_multisite'] = '';
			}

			// Save default options to database.
			update_option( 'auth_settings', $auth_settings );
			update_option( 'auth_settings_access_users_pending', $auth_settings_access_users_pending );
			update_option( 'auth_settings_access_users_approved', $auth_settings_access_users_approved );
			update_option( 'auth_settings_access_users_blocked', $auth_settings_access_users_blocked );

			// Multisite defaults.
			if ( is_multisite() ) {
				$auth_multisite_settings = get_blog_option( BLOG_ID_CURRENT_SITE, 'auth_multisite_settings', array() );

				if ( $auth_multisite_settings === FALSE ) {
					$auth_multisite_settings = array();
				}
				// Global switch for enabling multisite options.
				if ( ! array_key_exists( 'multisite_override', $auth_multisite_settings ) ) {
					$auth_multisite_settings['multisite_override'] = '';
				}
				// Access Lists Defaults.
				$auth_multisite_settings_access_users_approved = get_blog_option( BLOG_ID_CURRENT_SITE, 'auth_multisite_settings_access_users_approved' );
				if ( $auth_multisite_settings_access_users_approved === FALSE ) {
					$auth_multisite_settings_access_users_approved = array();
				}
				// Login Access Defaults.
				if ( ! array_key_exists( 'access_who_can_login', $auth_multisite_settings ) ) {
					$auth_multisite_settings['access_who_can_login'] = 'approved_users';
				}
				// View Access Defaults.
				if ( ! array_key_exists( 'access_who_can_view', $auth_multisite_settings ) ) {
					$auth_multisite_settings['access_who_can_view'] = 'everyone';
				}
				// External Service Defaults.
				if ( ! array_key_exists( 'access_default_role', $auth_multisite_settings ) ) {
					// Set default role to 'student' if that role exists, 'subscriber' otherwise.
					$all_roles = $wp_roles->roles;
					$editable_roles = apply_filters( 'editable_roles', $all_roles );
					if ( array_key_exists( 'student', $editable_roles ) ) {
						$auth_multisite_settings['access_default_role'] = 'student';
					} else {
						$auth_multisite_settings['access_default_role'] = 'subscriber';
					}
				}
				if ( ! array_key_exists( 'google', $auth_multisite_settings ) ) {
					$auth_multisite_settings['google'] = '';
				}
				if ( ! array_key_exists( 'cas', $auth_multisite_settings ) ) {
					$auth_multisite_settings['cas'] = '';
				}
				if ( ! array_key_exists( 'ldap', $auth_multisite_settings ) ) {
					$auth_multisite_settings['ldap'] = '';
				}
				if ( ! array_key_exists( 'google_clientid', $auth_multisite_settings ) ) {
					$auth_multisite_settings['google_clientid'] = '';
				}
				if ( ! array_key_exists( 'google_clientsecret', $auth_multisite_settings ) ) {
					$auth_multisite_settings['google_clientsecret'] = '';
				}
				if ( ! array_key_exists( 'google_hosteddomain', $auth_multisite_settings ) ) {
					$auth_multisite_settings['google_hosteddomain'] = '';
				}
				if ( ! array_key_exists( 'cas_custom_label', $auth_multisite_settings ) ) {
					$auth_multisite_settings['cas_custom_label'] = 'CAS';
				}
				if ( ! array_key_exists( 'cas_host', $auth_multisite_settings ) ) {
					$auth_multisite_settings['cas_host'] = '';
				}
				if ( ! array_key_exists( 'cas_port', $auth_multisite_settings ) ) {
					$auth_multisite_settings['cas_port'] = '';
				}
				if ( ! array_key_exists( 'cas_path', $auth_multisite_settings ) ) {
					$auth_multisite_settings['cas_path'] = '';
				}
				if ( ! array_key_exists( 'cas_version', $auth_multisite_settings ) ) {
					$auth_multisite_settings['cas_version'] = 'SAML_VERSION_1_1';
				}
				if ( ! array_key_exists( 'cas_attr_email', $auth_multisite_settings ) ) {
					$auth_multisite_settings['cas_attr_email'] = '';
				}
				if ( ! array_key_exists( 'cas_attr_first_name', $auth_multisite_settings ) ) {
					$auth_multisite_settings['cas_attr_first_name'] = '';
				}
				if ( ! array_key_exists( 'cas_attr_last_name', $auth_multisite_settings ) ) {
					$auth_multisite_settings['cas_attr_last_name'] = '';
				}
				if ( ! array_key_exists( 'cas_attr_update_on_login', $auth_multisite_settings ) ) {
					$auth_multisite_settings['cas_attr_update_on_login'] = '';
				}
				if ( ! array_key_exists( 'cas_auto_login', $auth_multisite_settings ) ) {
					$auth_multisite_settings['cas_auto_login'] = '';
				}
				if ( ! array_key_exists( 'ldap_host', $auth_multisite_settings ) ) {
					$auth_multisite_settings['ldap_host'] = '';
				}
				if ( ! array_key_exists( 'ldap_port', $auth_multisite_settings ) ) {
					$auth_multisite_settings['ldap_port'] = '389';
				}
				if ( ! array_key_exists( 'ldap_search_base', $auth_multisite_settings ) ) {
					$auth_multisite_settings['ldap_search_base'] = '';
				}
				if ( ! array_key_exists( 'ldap_uid', $auth_multisite_settings ) ) {
					$auth_multisite_settings['ldap_uid'] = 'uid';
				}
				if ( ! array_key_exists( 'ldap_attr_email', $auth_multisite_settings ) ) {
					$auth_multisite_settings['ldap_attr_email'] = '';
				}
				if ( ! array_key_exists( 'ldap_user', $auth_multisite_settings ) ) {
					$auth_multisite_settings['ldap_user'] = '';
				}
				if ( ! array_key_exists( 'ldap_password', $auth_multisite_settings ) ) {
					$auth_multisite_settings['ldap_password'] = '';
				}
				if ( ! array_key_exists( 'ldap_tls', $auth_multisite_settings ) ) {
					$auth_multisite_settings['ldap_tls'] = '1';
				}
				if ( ! array_key_exists( 'ldap_lostpassword_url', $auth_multisite_settings ) ) {
					$auth_multisite_settings['ldap_lostpassword_url'] = '';
				}
				if ( ! array_key_exists( 'ldap_attr_first_name', $auth_multisite_settings ) ) {
					$auth_multisite_settings['ldap_attr_first_name'] = '';
				}
				if ( ! array_key_exists( 'ldap_attr_last_name', $auth_multisite_settings ) ) {
					$auth_multisite_settings['ldap_attr_last_name'] = '';
				}
				if ( ! array_key_exists( 'ldap_attr_update_on_login', $auth_multisite_settings ) ) {
					$auth_multisite_settings['ldap_attr_update_on_login'] = '';
				}
				// Advanced defaults.
				if ( ! array_key_exists( 'advanced_lockouts', $auth_multisite_settings ) ) {
					$auth_multisite_settings['advanced_lockouts'] = array(
						'attempts_1' => 10,
						'duration_1' => 1,
						'attempts_2' => 10,
						'duration_2' => 10,
						'reset_duration' => 120,
					);
				}
				if ( ! array_key_exists( 'advanced_hide_wp_login', $auth_multisite_settings ) ) {
					$auth_multisite_settings['advanced_hide_wp_login'] = '';
				}
				// Save default network options to database.
				update_blog_option( BLOG_ID_CURRENT_SITE, 'auth_multisite_settings', $auth_multisite_settings );
				update_blog_option( BLOG_ID_CURRENT_SITE, 'auth_multisite_settings_access_users_approved', $auth_multisite_settings_access_users_approved );
			}
		}


		/**
		 * List sanitizer.
		 * $side_effect = 'none' or 'update roles' to make sure WP user roles match
		 * $multisite_mode = 'single' or 'multisite' to indicate which user roles to change (this site or all sites)
		 */
		function sanitize_user_list( $list, $side_effect = 'none', $multisite_mode = 'single' ) {
			// If it's not a list, make it so.
			if ( ! is_array( $list ) ) {
				$list = array();
			}
			foreach ( $list as $key => $user_info ) {
				if ( strlen( $user_info['email'] ) < 1 ) {
					// Make sure there are no empty entries in the list
					unset( $list[$key] );
				} elseif ( $side_effect === 'update roles' ) {
					// Make sure the WordPress user accounts have the same role
					// as that indicated in the list.
					$wp_user = get_user_by( 'email', $user_info['email'] );
					if ( $wp_user ) {
						if ( is_multisite() && $multisite_mode === 'multisite' ) {
							foreach ( get_blogs_of_user( $wp_user->ID ) as $blog ) {
								add_user_to_blog( $blog->userblog_id, $wp_user->ID, $user_info['role'] );
							}
						} else {
							$wp_user->set_role( $user_info['role'] );
						}
					}
				}
			}
			return $list;
		}


		/**
		 * Settings sanitizer callback
		 */
		function sanitize_options( $auth_settings ) {
			// Default to "Approved Users" login access restriction.
			if ( ! in_array( $auth_settings['access_who_can_login'], array( 'external_users', 'approved_users' ) ) ) {
				$auth_settings['access_who_can_login'] = 'approved_users';
			}

			// Default to "Everyone" view access restriction.
			if ( ! in_array( $auth_settings['access_who_can_view'], array( 'everyone', 'logged_in_users' ) ) ) {
				$auth_settings['access_who_can_view'] = 'everyone';
			}

			// Default to WordPress login access redirect.
			// Note: this option doesn't exist in multisite options, so we first
			// check to see if it exists.
			if ( array_key_exists( 'access_redirect', $auth_settings ) && ! in_array( $auth_settings['access_redirect'], array( 'login', 'page', 'message' ) ) ) {
				$auth_settings['access_redirect'] = 'login';
			}

			// Default to warning message for anonymous users on public pages.
			// Note: this option doesn't exist in multisite options, so we first
			// check to see if it exists.
			if ( array_key_exists( 'access_public_warning', $auth_settings ) && ! in_array( $auth_settings['access_public_warning'], array( 'no_warning', 'warning' ) ) ) {
				$auth_settings['access_public_warning'] = 'no_warning';
			}

			// Sanitize Send welcome email (checkbox: value can only be '1' or empty string)
			$auth_settings['access_should_email_approved_users'] = array_key_exists( 'access_should_email_approved_users', $auth_settings ) && strlen( $auth_settings['access_should_email_approved_users'] ) > 0 ? '1' : '';

			// Sanitize Enable Google Logins (checkbox: value can only be '1' or empty string)
			$auth_settings['google'] = array_key_exists( 'google', $auth_settings ) && strlen( $auth_settings['google'] ) > 0 ? '1' : '';

			// Sanitize Enable CAS Logins (checkbox: value can only be '1' or empty string)
			$auth_settings['cas'] = array_key_exists( 'cas', $auth_settings ) && strlen( $auth_settings['cas'] ) > 0 ? '1' : '';

			// Sanitize CAS Host setting
			$auth_settings['cas_host'] = filter_var( $auth_settings['cas_host'], FILTER_SANITIZE_URL );

			// Sanitize CAS Port (int)
			$auth_settings['cas_port'] = filter_var( $auth_settings['cas_port'], FILTER_SANITIZE_NUMBER_INT );

			// Sanitize CAS attribute update (checkbox: value can only be '1' or empty string)
			$auth_settings['cas_attr_update_on_login'] = array_key_exists( 'cas_attr_update_on_login', $auth_settings ) && strlen( $auth_settings['cas_attr_update_on_login'] ) > 0 ? '1' : '';

			// Sanitize CAS auto-login (checkbox: value can only be '1' or empty string)
			$auth_settings['cas_auto_login'] = array_key_exists( 'cas_auto_login', $auth_settings ) && strlen( $auth_settings['cas_auto_login'] ) > 0 ? '1' : '';

			// Sanitize Enable LDAP Logins (checkbox: value can only be '1' or empty string)
			$auth_settings['ldap'] = array_key_exists( 'ldap', $auth_settings ) && strlen( $auth_settings['ldap'] ) > 0 ? '1' : '';

			// Sanitize LDAP Host setting
			$auth_settings['ldap_host'] = filter_var( $auth_settings['ldap_host'], FILTER_SANITIZE_URL );

			// Sanitize LDAP Port (int)
			$auth_settings['ldap_port'] = filter_var( $auth_settings['ldap_port'], FILTER_SANITIZE_NUMBER_INT );

			// Sanitize LDAP attributes (basically make sure they don't have any parentheses)
			$auth_settings['ldap_uid'] = filter_var( $auth_settings['ldap_uid'], FILTER_SANITIZE_EMAIL );

			// Sanitize LDAP TLS (checkbox: value can only be '1' or empty string)
			$auth_settings['ldap_tls'] = array_key_exists( 'ldap_tls', $auth_settings ) && strlen( $auth_settings['ldap_tls'] ) > 0 ? '1' : '';

			// Sanitize LDAP Lost Password URL
			$auth_settings['ldap_lostpassword_url'] = filter_var( $auth_settings['ldap_lostpassword_url'], FILTER_SANITIZE_URL );

			// Obfuscate LDAP directory user password
			if ( strlen( $auth_settings['ldap_password'] ) > 0 ) {
				// encrypt the directory user password for some minor obfuscation in the database.
				$auth_settings['ldap_password'] = base64_encode( $this->encrypt( $auth_settings['ldap_password'] ) );
			}

			// Sanitize LDAP attribute update (checkbox: value can only be '1' or empty string)
			$auth_settings['ldap_attr_update_on_login'] = array_key_exists( 'ldap_attr_update_on_login', $auth_settings ) && strlen( $auth_settings['ldap_attr_update_on_login'] ) > 0 ? '1' : '';

			// Make sure public pages is an empty array if it's empty
			// Note: this option doesn't exist in multisite options, so we first
			// check to see if it exists.
			if ( array_key_exists( 'access_public_pages', $auth_settings ) && ! is_array( $auth_settings['access_public_pages'] ) ) {
				$auth_settings['access_public_pages'] = array();
			}

			// Make sure all lockout options are integers (attempts_1,
			// duration_1, attempts_2, duration_2, reset_duration).
			foreach ( $auth_settings['advanced_lockouts'] as $key => $value ) {
				$auth_settings['advanced_lockouts'][$key] = filter_var( $value, FILTER_SANITIZE_NUMBER_INT );
			}

			// Sanitize Hide WordPress logins (checkbox: value can only be '1' or empty string)
			$auth_settings['advanced_hide_wp_login'] = array_key_exists( 'advanced_hide_wp_login', $auth_settings ) && strlen( $auth_settings['advanced_hide_wp_login'] ) > 0 ? '1' : '';

			// Sanitize Override multisite options (checkbox: value can only be '1' or empty string)
			$auth_settings['advanced_override_multisite'] = array_key_exists( 'advanced_override_multisite', $auth_settings ) && strlen( $auth_settings['advanced_override_multisite'] ) > 0 ? '1' : '';

			return $auth_settings;
		}


		/**
		 * Keep authorizer approved users' roles in sync with WordPress roles
		 * if someone changes the role via the WordPress Edit User options page.
		 *
		 * @action edit_user_profile_update
		 * @ref https://codex.wordpress.org/Plugin_API/Action_Reference/edit_user_profile_update
		 * @param int     $user_id The user ID of the user being edited

		 * @action personal_options_update
		 * @ref https://codex.wordpress.org/Plugin_API/Action_Reference/personal_options_update
		 * @param int     $user_id The user ID of the user being edited
		 */
		function edit_user_profile_update_role( $user_id ) {
			if ( ! current_user_can( 'edit_user', $user_id ) ) {
				return;
			}

			// If user is in approved list, update his/her associated role.
			$wp_user = get_user_by( 'id', $user_id );
			if ( $this->is_email_in_list( $wp_user->get( 'user_email' ), 'approved' ) ) {
				$auth_settings_access_users_approved = $this->sanitize_user_list( $this->get_plugin_option( 'access_users_approved', SINGLE_ADMIN ) );
				// Find approved user and sync with the corresponding WP_User.
				foreach ( $auth_settings_access_users_approved as $key => $user ) {
					if ( $user['email'] === $wp_user->user_email ) {
						// Sync user role.
						if ( array_key_exists( 'role', $_REQUEST ) ) {
							$auth_settings_access_users_approved[$key]['role'] = $_REQUEST['role'];
						}
						// Sync email address.
						if ( array_key_exists( 'email', $_REQUEST ) ) {
							$auth_settings_access_users_approved[$key]['email'] = $_REQUEST['email'];
						}
					}
				}

				update_option( 'auth_settings_access_users_approved', $auth_settings_access_users_approved );
			}
		}


		/**
		 * Settings print callbacks
		 */
		function print_section_info_tabs( $args = '' ) {
			if ( MULTISITE_ADMIN === $this->get_admin_mode( $args )): ?>
				<h2 class="nav-tab-wrapper">
					<a class="nav-tab nav-tab-access_lists nav-tab-active" href="javascript:choose_tab('access_lists' );"><?php _e( 'Access Lists', 'authorizer' ); ?></a>
					<a class="nav-tab nav-tab-external" href="javascript:choose_tab('external' );"><?php _e( 'External Service', 'authorizer' ); ?></a>
					<a class="nav-tab nav-tab-advanced" href="javascript:choose_tab('advanced' );"><?php _e( 'Advanced', 'authorizer' ); ?></a>
				</h2>
			<?php else: ?>
				<h2 class="nav-tab-wrapper">
					<a class="nav-tab nav-tab-access_lists nav-tab-active" href="javascript:choose_tab('access_lists' );"><?php _e( 'Access Lists', 'authorizer' ); ?></a>
					<a class="nav-tab nav-tab-access_login" href="javascript:choose_tab('access_login' );"><?php _e( 'Login Access', 'authorizer' ); ?></a>
					<a class="nav-tab nav-tab-access_public" href="javascript:choose_tab('access_public' );"><?php _e( 'Public Access', 'authorizer' ); ?></a>
					<a class="nav-tab nav-tab-external" href="javascript:choose_tab('external' );"><?php _e( 'External Service', 'authorizer' ); ?></a>
					<a class="nav-tab nav-tab-advanced" href="javascript:choose_tab('advanced' );"><?php _e( 'Advanced', 'authorizer' ); ?></a>
				</h2>
			<?php endif;
		}


		function print_section_info_access_lists( $args = '' ) {
			$admin_mode = $this->get_admin_mode( $args );
			?><div id="section_info_access_lists" class="section_info">
				<p><?php _e( 'Manage who has access to this site using these lists.', 'authorizer' ); ?></p>
				<ol>
					<li><?php _e( "<strong>Pending</strong> users are users who have successfully logged in to the site, but who haven't yet been approved (or blocked) by you.", 'authorizer' ); ?></li>
					<li><?php _e( '<strong>Approved</strong> users have access to the site once they successfully log in.', 'authorizer' ); ?></li>
					<li><?php _e( '<strong>Blocked</strong> users will receive an error message when they try to visit the site after authenticating.', 'authorizer' ); ?></li>
				</ol>
			</div>
			<table class="form-table">
				<tbody>
					<tr>
						<th scope="row"><?php _e( 'Pending Users', 'authorizer' ); ?> <em>(<?php echo $this->get_user_count_from_list( 'pending', $admin_mode ); ?>)</em></th>
						<td><?php $this->print_combo_auth_access_users_pending(); ?></td>
					</tr>
					<tr>
						<th scope="row"><?php _e( 'Approved Users', 'authorizer' ); ?> <em>(<?php echo $this->get_user_count_from_list( 'approved', $admin_mode ); ?>)</em></th>
						<td><?php $this->print_combo_auth_access_users_approved(); ?></td>
					</tr>
					<tr>
						<th scope="row"><?php _e( 'Blocked Users', 'authorizer' ); ?> <em>(<?php echo $this->get_user_count_from_list( 'blocked', $admin_mode ); ?>)</em></th>
						<td><?php $this->print_combo_auth_access_users_blocked(); ?></td>
					</tr>
				</tbody>
			</table>
			<?php
		}


		function print_combo_auth_access_users_pending( $args = '' ) {
			// Get plugin option.
			$option = 'access_users_pending';
			$auth_settings_option = $this->get_plugin_option( $option );
			$auth_settings_option = is_array( $auth_settings_option ) ? $auth_settings_option : array();

			// Print option elements.
			?><ul id="list_auth_settings_access_users_pending" style="margin:0;">
				<?php if ( count( $auth_settings_option ) > 0 ) : ?>
					<?php foreach ( $auth_settings_option as $key => $pending_user ): ?>
						<?php if ( empty( $pending_user ) || count( $pending_user ) < 1 ) continue; ?>
						<?php $pending_user['is_wp_user'] = false; ?>
						<li>
							<input type="text" id="auth_settings_<?php echo $option; ?>_<?php echo $key; ?>" value="<?php echo $pending_user['email']; ?>" readonly="true" class="auth-email" />
							<select id="auth_settings_<?php echo $option; ?>_<?php echo $key; ?>_role" class="auth-role">
								<?php $this->wp_dropdown_permitted_roles( $pending_user['role'] ); ?>
							</select>
							<a href="javascript:void(0);" class="button-primary" id="approve_user_<?php echo $key; ?>" onclick="auth_add_user( this, 'approved', false ); auth_ignore_user( this, 'pending' );"><span class="glyphicon glyphicon-ok"></span> <?php _e( 'Approve', 'authorizer' ); ?></a>
							<a href="javascript:void(0);" class="button-primary" id="block_user_<?php echo $key; ?>" onclick="auth_add_user( this, 'blocked', false ); auth_ignore_user( this, 'pending' );"><span class="glyphicon glyphicon-ban-circle"></span> <?php _e( 'Block', 'authorizer' ); ?></a>
							<a href="javascript:void(0);" class="button button-secondary" id="ignore_user_<?php echo $key; ?>" onclick="auth_ignore_user( this, 'pending' );" title="<?php _e( 'Remove user', 'authorizer' ); ?>"><span class="glyphicon glyphicon-remove"></span> <?php _e( 'Ignore', 'authorizer' ); ?></a>
						</li>
					<?php endforeach; ?>
				<?php else: ?>
						<li class="auth-empty"><em><?php _e( 'No pending users', 'authorizer' ); ?></em></li>
				<?php endif; ?>
			</ul>
			<?php
		}


		function print_combo_auth_access_users_approved( $args = '' ) {
			// Get plugin option.
			$option = 'access_users_approved';
			$admin_mode = $this->get_admin_mode( $args );
			$auth_settings_option = $this->get_plugin_option( $option, $admin_mode, 'no override' );
			$auth_settings_option = is_array( $auth_settings_option ) ? $auth_settings_option : array();

			// Get multisite approved users (add them to top of list, greyed out).
			$auth_override_multisite = $this->get_plugin_option( 'advanced_override_multisite' );
			$auth_multisite_settings = $this->get_plugin_options( MULTISITE_ADMIN );
			$auth_settings_option_multisite = array();
			if (
				is_multisite() &&
				$auth_override_multisite != '1' &&
				array_key_exists( 'multisite_override', $auth_multisite_settings ) &&
				$auth_multisite_settings['multisite_override'] === '1'
			) {
				$auth_settings_option_multisite = $this->get_plugin_option( $option, MULTISITE_ADMIN, 'allow override' );
				$auth_settings_option_multisite = is_array( $auth_settings_option_multisite ) ? $auth_settings_option_multisite : array();
			}

			// Get default role for new user dropdown.
			$access_default_role = $this->get_plugin_option( 'access_default_role', SINGLE_ADMIN, 'allow override' );

			// Get custom usermeta field to show.
			$advanced_usermeta = $this->get_plugin_option( 'advanced_usermeta' );

			// Adjust javascript function prefixes if multisite.
			$js_function_prefix = $admin_mode === MULTISITE_ADMIN ? 'auth_multisite_' : 'auth_';
			$multisite_admin_page = $admin_mode === MULTISITE_ADMIN;

			?><ul id="list_auth_settings_access_users_approved" style="margin:0;">
				<?php if ( ! $multisite_admin_page ) :
					foreach ( $auth_settings_option_multisite as $key => $approved_user ) :
						if ( empty( $approved_user ) || count( $approved_user ) < 1 ) :
							continue;
						endif;
						$approved_wp_user = get_user_by( 'email', $approved_user['email'] );
						if ( $approved_wp_user ) :
							$approved_user['email'] = $approved_wp_user->user_email;
							$approved_user['role'] = $multisite_admin_page || count( $approved_wp_user->roles ) === 0 ? $approved_user['role'] : array_shift( $approved_wp_user->roles );
							$approved_user['date_added'] = $approved_wp_user->user_registered;
							// Get usermeta field from the WordPress user's real usermeta.
							if ( strlen( $advanced_usermeta ) > 0 ) :
								if ( strpos( $advanced_usermeta, 'acf___' ) === 0 && class_exists( 'acf' ) ) :
									// Get ACF Field value for the user
									$approved_user['usermeta'] = get_field( str_replace('acf___', '', $advanced_usermeta ), 'user_' . $approved_wp_user->ID );
								else :
									// Get regular usermeta value for the user.
									$approved_user['usermeta'] = get_user_meta( $approved_wp_user->ID, $advanced_usermeta, true );
								endif;

								if ( is_array( $approved_user['usermeta'] ) || is_object( $approved_user['usermeta'] ) ) :
									$approved_user['usermeta'] = serialize( $approved_user['usermeta'] );
								endif;
							endif;
						endif;
						if ( ! array_key_exists( 'usermeta', $approved_user ) ) :
							$approved_user['usermeta'] = '';
						endif; ?>
						<li>
							<input type="text" id="auth_multisite_settings_<?php echo $option; ?>_<?php echo $key; ?>" value="<?php echo $approved_user['email']; ?>" readonly="true" class="auth-email auth-multisite-email" />
							<select id="auth_multisite_settings_<?php echo $option; ?>_<?php echo $key; ?>_role" class="auth-role auth-multisite-role" disabled="disabled">
								<?php $this->wp_dropdown_permitted_roles( $approved_user['role'] ); ?>
							</select>
							<input type="text" id="auth_multisite_settings_<?php echo $option; ?>_<?php echo $key; ?>_date_added" value="<?php echo date( 'M Y', strtotime( $approved_user['date_added'] ) ); ?>" readonly="true" class="auth-date-added auth-multisite-date-added" disabled="disabled" />
							<?php if ( strlen( $advanced_usermeta ) > 0 ) :
								$should_show_usermeta_in_text_field = true; // Fallback renderer for usermeta; try to use a select first.
								if ( strpos( $advanced_usermeta, 'acf___' ) === 0 && class_exists( 'acf' ) ) :
									$field_object = get_field_object( str_replace('acf___', '', $advanced_usermeta ) );
									if ( is_array( $field_object ) && array_key_exists( 'type', $field_object ) && $field_object['type'] === 'select' ) :
										$should_show_usermeta_in_text_field = false; ?>
										<select id="auth_settings_<?php echo $option; ?>_<?php echo $key; ?>_usermeta" class="auth-usermeta auth-multisite-usermeta" onchange="<?php echo $js_function_prefix; ?>update_usermeta( this );">
											<option value=""<?php if ( empty( $approved_user['usermeta'] ) ) echo ' selected="selected"'; ?>><?php _e( '-- None --', 'authorizer' ); ?></option>
											<?php foreach ( $field_object['choices'] as $key => $label ) : ?>
												<option value="<?php echo $key; ?>"<?php if ( $key === $approved_user['usermeta'] || ( is_array( $approved_user['usermeta'] ) && array_key_exists( get_current_blog_id(), $approved_user['usermeta'] ) && $key === $approved_user['usermeta'][get_current_blog_id()]['meta_value'] ) ) echo ' selected="selected"'; ?>><?php echo $label; ?></option>
											<?php endforeach; ?>
										</select>
									<?php endif; ?>
								<?php endif; ?>
								<?php if ( $should_show_usermeta_in_text_field ) : ?>
									<input type="text" id="auth_multisite_settings_<?php echo $option; ?>_<?php echo $key; ?>_usermeta" value="<?php echo htmlspecialchars( $approved_user['usermeta'], ENT_COMPAT ); ?>" class="auth-usermeta auth-multisite-usermeta" />
									<a class="button button-small button-primary update-usermeta" id="update_usermeta_<?php echo $key; ?>" onclick="<?php echo $js_function_prefix; ?>update_usermeta( this );" title="Update usermeta"><span class="glyphicon glyphicon-floppy-saved"></span></a>
								<?php endif; ?>
							<?php endif; ?>
							&nbsp;&nbsp;<a title="WordPress Multisite user" class="auth-multisite-user"><span class="glyphicon glyphicon-globe"></span></a>
						</li>
					<?php endforeach;
				endif;
				foreach ( $auth_settings_option as $key => $approved_user ):
					$is_current_user = false;
					$local_user_icon = array_key_exists( 'local_user', $approved_user ) && $approved_user['local_user'] === 'true' ? '&nbsp;<a title="Local WordPress user" class="auth-local-user"><span class="glyphicon glyphicon-user"></span></a>' : '';
					if ( empty( $approved_user ) || count( $approved_user ) < 1 ) :
						continue;
					endif;
					$approved_wp_user = get_user_by( 'email', $approved_user['email'] );
					if ( $approved_wp_user ) :
						$approved_user['email'] = $approved_wp_user->user_email;
						$approved_user['role'] = $multisite_admin_page || count( $approved_wp_user->roles ) === 0 ? $approved_user['role'] : array_shift( $approved_wp_user->roles );
						$approved_user['date_added'] = $approved_wp_user->user_registered;
						$approved_user['is_wp_user'] = true;
						$is_current_user = $approved_wp_user->ID === get_current_user_id();
						// Get usermeta field from the WordPress user's real usermeta.
						if ( strlen( $advanced_usermeta ) > 0 ) :
							if ( strpos( $advanced_usermeta, 'acf___' ) === 0 && class_exists( 'acf' ) ) :
								// Get ACF Field value for the user
								$approved_user['usermeta'] = get_field( str_replace('acf___', '', $advanced_usermeta ), 'user_' . $approved_wp_user->ID );
							else :
								// Get regular usermeta value for the user.
								$approved_user['usermeta'] = get_user_meta( $approved_wp_user->ID, $advanced_usermeta, true );
							endif;

							if ( is_array( $approved_user['usermeta'] ) || is_object( $approved_user['usermeta'] ) ) :
								$approved_user['usermeta'] = serialize( $approved_user['usermeta'] );
							endif;
						endif;
					else :
						$approved_user['is_wp_user'] = false;
					endif;
					if ( ! array_key_exists( 'usermeta', $approved_user ) ) :
						$approved_user['usermeta'] = '';
					endif; ?>
					<li>
						<input type="text" id="auth_settings_<?php echo $option; ?>_<?php echo $key; ?>" value="<?php echo $approved_user['email']; ?>" readonly="true" class="auth-email" />
						<select id="auth_settings_<?php echo $option; ?>_<?php echo $key; ?>_role" class="auth-role" onchange="<?php echo $js_function_prefix; ?>change_role( this );">
							<?php $disable_input = $is_current_user ? 'disabled' : null; ?>
							<?php $this->wp_dropdown_permitted_roles( $approved_user['role'], $disable_input ); ?>
						</select>
						<input type="text" id="auth_settings_<?php echo $option; ?>_<?php echo $key; ?>_date_added" value="<?php echo date( 'M Y', strtotime( $approved_user['date_added'] ) ); ?>" readonly="true" class="auth-date-added" />
						<?php if ( strlen( $advanced_usermeta ) > 0 ) :
							$should_show_usermeta_in_text_field = true; // Fallback renderer for usermeta; try to use a select first.
							if ( strpos( $advanced_usermeta, 'acf___' ) === 0 && class_exists( 'acf' ) ) :
								$field_object = get_field_object( str_replace('acf___', '', $advanced_usermeta ) );
								if ( is_array( $field_object ) && array_key_exists( 'type', $field_object ) && $field_object['type'] === 'select' ) :
									$should_show_usermeta_in_text_field = false; ?>
									<select id="auth_settings_<?php echo $option; ?>_<?php echo $key; ?>_usermeta" class="auth-usermeta" onchange="<?php echo $js_function_prefix; ?>update_usermeta( this );" >
										<option value=""<?php if ( empty( $approved_user['usermeta'] ) ) echo ' selected="selected"'; ?>><?php _e( '-- None --', 'authorizer' ); ?></option>
										<?php foreach ( $field_object['choices'] as $key => $label ) : ?>
											<option value="<?php echo $key; ?>"<?php if ( $key === $approved_user['usermeta'] || ( is_array( $approved_user['usermeta'] ) && $key === $approved_user['usermeta']['meta_value'] ) ) echo ' selected="selected"'; ?>><?php echo $label; ?></option>
										<?php endforeach; ?>
									</select>
								<?php endif; ?>
							<?php endif; ?>
							<?php if ( $should_show_usermeta_in_text_field ) : ?>
								<input type="text" id="auth_settings_<?php echo $option; ?>_<?php echo $key; ?>_usermeta" value="<?php echo htmlspecialchars( $approved_user['usermeta'], ENT_COMPAT ); ?>" class="auth-usermeta" />
								<a class="button button-small button-primary update-usermeta" id="update_usermeta_<?php echo $key; ?>" onclick="<?php echo $js_function_prefix; ?>update_usermeta( this );" title="Update usermeta"><span class="glyphicon glyphicon-floppy-saved"></span></a>
							<?php endif; ?>
						<?php endif; ?>
						<?php if ( ! $is_current_user ): ?>
							<?php if ( ! $multisite_admin_page ) : ?>
								<a class="button" id="block_user_<?php echo $key; ?>" onclick="<?php echo $js_function_prefix; ?>add_user( this, 'blocked', false ); <?php echo $js_function_prefix; ?>ignore_user( this, 'approved' );" title="<?php _e( 'Block/Ban user', 'authorizer' ); ?>"><span class="glyphicon glyphicon-ban-circle"></span></a>
							<?php endif; ?>
							<a class="button" id="ignore_user_<?php echo $key; ?>" onclick="<?php echo $js_function_prefix; ?>ignore_user(this, 'approved' );" title="<?php _e( 'Remove user', 'authorizer' ); ?>"><span class="glyphicon glyphicon-remove"></span></a>
						<?php endif; ?>
						<?php echo $local_user_icon; ?>
					</li>
				<?php endforeach; ?>
			</ul>
			<div id="new_auth_settings_<?php echo $option; ?>">
				<input type="text" id="new_approved_user_email" placeholder="<?php _e( 'email address', 'authorizer' ); ?>" class="auth-email new" />
				<select id="new_approved_user_role" class="auth-role">
					<?php $this->wp_dropdown_permitted_roles( $access_default_role ); ?>
				</select>
				<div class="btn-group">
					<a href="javascript:void(0);" class="btn button-primary dropdown-toggle" id="approve_user_new" onclick="<?php echo $js_function_prefix; ?>add_user(this, 'approved' );"><span class="glyphicon glyphicon-ok"></span> <?php _e( 'Approve', 'authorizer' ); ?></a>
					<button type="button" class="btn button-primary dropdown-toggle" data-toggle="dropdown">
						<span class="caret"></span>
						<span class="sr-only"><?php _e( 'Toggle Dropdown', 'authorizer' ); ?></span>
					</button>
					<ul class="dropdown-menu" role="menu">
						<li><a href="javascript:void(0);" onclick="<?php echo $js_function_prefix; ?>add_user( document.getElementById('approve_user_new' ), 'approved', true);"><?php _e( 'Create a local WordPress <br />account instead, and email <br />the user their password.', 'authorizer' ); ?></a></li>
					</ul>
				</div>
			</div>
			<?php
		}


		function print_combo_auth_access_users_blocked( $args = '' ) {
			// Get plugin option.
			$option = 'access_users_blocked';
			$auth_settings_option = $this->get_plugin_option( $option );
			$auth_settings_option = is_array( $auth_settings_option ) ? $auth_settings_option : array();

			// Get default role for new blocked user dropdown.
			$access_default_role = $this->get_plugin_option( 'access_default_role', SINGLE_ADMIN, 'allow override' );

			// Print option elements.
			?><ul id="list_auth_settings_<?php echo $option; ?>" style="margin:0;">
				<?php foreach ( $auth_settings_option as $key => $blocked_user ): ?>
					<?php if ( empty( $blocked_user ) || count( $blocked_user ) < 1 ) continue; ?>
					<?php if ( $blocked_wp_user = get_user_by( 'email', $blocked_user['email'] ) ): ?>
						<?php $blocked_user['email'] = $blocked_wp_user->user_email; ?>
						<?php $blocked_user['role'] = array_shift( $blocked_wp_user->roles ); ?>
						<?php $blocked_user['date_added'] = $blocked_wp_user->user_registered; ?>
						<?php $blocked_user['is_wp_user'] = true; ?>
					<?php else: ?>
						<?php $blocked_user['is_wp_user'] = false; ?>
					<?php endif; ?>
					<li>
						<input type="text" id="auth_settings_<?php echo $option; ?>_<?php echo $key; ?>" value="<?php echo $blocked_user['email']; ?>" readonly="true" class="auth-email" />
						<select id="auth_settings_<?php echo $option; ?>_<?php echo $key; ?>_role" class="auth-role">
							<?php $this->wp_dropdown_permitted_roles( $blocked_user['role'] ); ?>
						</select>
						<input type="text" id="auth_settings_<?php echo $option; ?>_<?php echo $key; ?>_date_added" value="<?php echo date( 'M Y', strtotime( $blocked_user['date_added'] ) ); ?>" readonly="true" class="auth-date-added" />
						<a class="button" id="ignore_user_<?php echo $key; ?>" onclick="auth_ignore_user(this, 'blocked' );" title="<?php _e( 'Remove user', 'authorizer' ); ?>"><span class="glyphicon glyphicon-remove"></span></a>
					</li>
				<?php endforeach; ?>
			</ul>
			<div id="new_auth_settings_<?php echo $option; ?>">
				<input type="text" id="new_blocked_user_email" placeholder="<?php _e( 'email address', 'authorizer' ); ?>" class="auth-email new" />
				<select id="new_blocked_user_role" class="auth-role">
					<option value="<?php echo $access_default_role; ?>"><?php echo ucfirst( $access_default_role ); ?></option>
				</select>
				<a href="javascript:void(0);" class="button-primary" id="block_user_new" onclick="auth_add_user(this, 'blocked' );"><span class="glyphicon glyphicon-ban-circle"></span> <?php _e( 'Block', 'authorizer' ); ?></a>
			</div>
			<?php
		}


		function print_section_info_access_login( $args = '' ) {
			?><div id="section_info_access_login" class="section_info">
				<?php wp_nonce_field( 'save_auth_settings', 'nonce_save_auth_settings' ); ?>
				<p><?php _e( 'Choose who is able to log into this site below.', 'authorizer' ); ?></p>
			</div><?php
		}


		function print_radio_auth_access_who_can_login( $args = '' ) {
			// Get plugin option.
			$option = 'access_who_can_login';
			$admin_mode = $this->get_admin_mode( $args );
			$auth_settings_option = $this->get_plugin_option( $option, $admin_mode, 'allow override', 'print overlay' );

			// If this site is configured independently of any multisite overrides, make sure we are not grabbing the multisite value; otherwise, grab the multisite value to show behind the disabled overlay.
			if ( is_multisite() && $this->get_plugin_option( 'advanced_override_multisite' ) == '1' ) {
				$auth_settings_option = $this->get_plugin_option( $option );
			} elseif ( is_multisite() && $admin_mode === SINGLE_ADMIN && $this->get_plugin_option( 'multisite_override', MULTISITE_ADMIN ) === '1' ) {
				// Workaround: javascript code hides/shows other settings based
				// on the selection in this option. If this option is overridden
				// by a multisite option, it should show that value in order to
				// correctly display the other appropriate options.
				// Side effect: this site option will be overwritten by the
				// multisite option on save. Since this is a 2-item radio, we
				// determined this was acceptable.
				$auth_settings_option = $this->get_plugin_option( $option, MULTISITE_ADMIN );
			}

			// Print option elements.
			?><input type="radio" id="radio_auth_settings_<?php echo $option; ?>_external_users" name="auth_settings[<?php echo $option; ?>]" value="external_users"<?php checked( 'external_users' == $auth_settings_option ); ?> /><label for="radio_auth_settings_<?php echo $option; ?>_external_users"><?php _e( 'All authenticated users (All external service users and all WordPress users)', 'authorizer' ); ?></label><br />
			<input type="radio" id="radio_auth_settings_<?php echo $option; ?>_approved_users" name="auth_settings[<?php echo $option; ?>]" value="approved_users"<?php checked( 'approved_users' == $auth_settings_option ); ?> /><label for="radio_auth_settings_<?php echo $option; ?>_approved_users"><?php _e( 'Only', 'authorizer' ); ?> <a href="javascript:choose_tab('access_lists' );" id="dashboard_link_approved_users"><?php _e( 'approved users', 'authorizer' ); ?></a> <?php _e( '(Approved external users and all WordPress users)', 'authorizer' ); ?></label><br /><?php
		}


		function print_select_auth_access_role_receive_pending_emails( $args = '' ) {
			// Get plugin option.
			$option = 'access_role_receive_pending_emails';
			$auth_settings_option = $this->get_plugin_option( $option );

			// Print option elements.
			?><select id="auth_settings_<?php echo $option; ?>" name="auth_settings[<?php echo $option; ?>]">
				<option value="---" <?php selected( $auth_settings_option, '---' ); ?>><?php _e( "None (Don't send notification emails)", 'authorizer' ); ?></option>
				<?php wp_dropdown_roles( $auth_settings_option ); ?>
			</select><?php
		}


		function print_wysiwyg_auth_access_pending_redirect_to_message( $args = '' ) {
			// Get plugin option.
			$option = 'access_pending_redirect_to_message';
			$auth_settings_option = $this->get_plugin_option( $option );

			// Print option elements.
			wp_editor(
				wpautop( $auth_settings_option ),
				"auth_settings_$option",
				array(
					'media_buttons' => false,
					'textarea_name' => "auth_settings[$option]",
					'textarea_rows' => 5,
					'tinymce' => true,
					'teeny' => true,
					'quicktags' => false,
				)
			);
		}


		function print_wysiwyg_auth_access_blocked_redirect_to_message( $args = '' ) {
			// Get plugin option.
			$option = 'access_blocked_redirect_to_message';
			$auth_settings_option = $this->get_plugin_option( $option );

			// Print option elements.
			wp_editor(
				wpautop( $auth_settings_option ),
				"auth_settings_$option",
				array(
					'media_buttons' => false,
					'textarea_name' => "auth_settings[$option]",
					'textarea_rows' => 5,
					'tinymce' => true,
					'teeny' => true,
					'quicktags' => false,
				)
			);
		}


		function print_checkbox_auth_access_should_email_approved_users( $args = '' ) {
			// Get plugin option.
			$option = 'access_should_email_approved_users';
			$auth_settings_option = $this->get_plugin_option( $option );

			// Print option elements.
			?><input type="checkbox" id="auth_settings_<?php echo $option; ?>" name="auth_settings[<?php echo $option; ?>]" value="1"<?php checked( 1 == $auth_settings_option ); ?> /><label for="auth_settings_<?php echo $option; ?>"><?php _e( 'Send a welcome email when approving a new user', 'authorizer' ); ?></label><?php
		}


		function print_text_auth_access_email_approved_users_subject( $args = '' ) {
			// Get plugin option.
			$option = 'access_email_approved_users_subject';
			$auth_settings_option = $this->get_plugin_option( $option );

			// Print option elements.
			?><input type="text" id="auth_settings_<?php echo $option; ?>" name="auth_settings[<?php echo $option; ?>]" value="<?php echo $auth_settings_option; ?>" placeholder="Welcome to [site_name]!" style="width:320px;" /><br /><small><?php _e( 'You can use the <b>[site_name]</b> shortcode.', 'authorizer' ); ?></small><?php
		}


		function print_wysiwyg_auth_access_email_approved_users_body( $args = '' ) {
			// Get plugin option.
			$option = 'access_email_approved_users_body';
			$auth_settings_option = $this->get_plugin_option( $option );

			// Print option elements.
			wp_editor(
				wpautop( $auth_settings_option ),
				"auth_settings_$option",
				array(
					'media_buttons' => false,
					'textarea_name' => "auth_settings[$option]",
					'textarea_rows' => 9,
					'tinymce' => true,
					'teeny' => true,
					'quicktags' => false,
				)
			);

			?><small><?php printf(
				/* TRANSLATORS: 1: Shortcode for site name 2: Shortcode for site URL 3: Shortcode for user email */
				__( 'You can use %1$s, %2$s, and %3$s shortcodes.', 'authorizer' ),
				'<b>[site_name]</b>',
				'<b>[site_url]</b>',
				'<b>[user_email]</b>'
			); ?></small><?php

		}


		function print_section_info_access_public( $args = '' ) {
			?><div id="section_info_access_public" class="section_info">
				<p><?php _e( 'Choose your public access options here.', 'authorizer' ); ?></p>
			</div><?php
		}


		function print_radio_auth_access_who_can_view( $args = '' ) {
			// Get plugin option.
			$option = 'access_who_can_view';
			$admin_mode = $this->get_admin_mode( $args );
			$auth_settings_option = $this->get_plugin_option( $option, $admin_mode, 'allow override', 'print overlay' );

			// If this site is configured independently of any multisite overrides, make sure we are not grabbing the multisite value; otherwise, grab the multisite value to show behind the disabled overlay.
			if ( is_multisite() && $this->get_plugin_option( 'advanced_override_multisite' ) == '1' ) {
				$auth_settings_option = $this->get_plugin_option( $option );
			} elseif ( is_multisite() && $admin_mode === SINGLE_ADMIN && $this->get_plugin_option( 'multisite_override', MULTISITE_ADMIN ) === '1' ) {
				// Workaround: javascript code hides/shows other settings based
				// on the selection in this option. If this option is overridden
				// by a multisite option, it should show that value in order to
				// correctly display the other appropriate options.
				// Side effect: this site option will be overwritten by the
				// multisite option on save. Since this is a 2-item radio, we
				// determined this was acceptable.
				$auth_settings_option = $this->get_plugin_option( $option, MULTISITE_ADMIN );
			}

			// Print option elements.
			?><input type="radio" id="radio_auth_settings_<?php echo $option; ?>_everyone" name="auth_settings[<?php echo $option; ?>]" value="everyone"<?php checked( 'everyone' == $auth_settings_option ); ?> /><label for="radio_auth_settings_<?php echo $option; ?>_everyone"><?php _e( 'Everyone can see the site', 'authorizer' ); ?></label><br />
			<input type="radio" id="radio_auth_settings_<?php echo $option; ?>_logged_in_users" name="auth_settings[<?php echo $option; ?>]" value="logged_in_users"<?php checked( 'logged_in_users' == $auth_settings_option ); ?> /><label for="radio_auth_settings_<?php echo $option; ?>_logged_in_users"><?php _e( 'Only logged in users can see the site', 'authorizer' ); ?></label><br /><?php
		}


		function print_radio_auth_access_redirect( $args = '' ) {
			// Get plugin option.
			$option = 'access_redirect';
			$auth_settings_option = $this->get_plugin_option( $option );

			// Print option elements.
			?><input type="radio" id="radio_auth_settings_<?php echo $option; ?>_to_login" name="auth_settings[<?php echo $option; ?>]" value="login"<?php checked( 'login' == $auth_settings_option ); ?> /><label for="radio_auth_settings_<?php echo $option; ?>_to_login"><?php _e( 'Send them to the login screen', 'authorizer' ); ?></label><br />
			<input type="radio" id="radio_auth_settings_<?php echo $option; ?>_to_message" name="auth_settings[<?php echo $option; ?>]" value="message"<?php checked( 'message' == $auth_settings_option ); ?> /><label for="radio_auth_settings_<?php echo $option; ?>_to_message"><?php _e( 'Show them the anonymous access message (below)', 'authorizer' ); ?></label><?php
		}


		function print_radio_auth_access_public_warning( $args = '' ) {
			// Get plugin option.
			$option = 'access_public_warning';
			$auth_settings_option = $this->get_plugin_option( $option );

			// Print option elements.
			?><input type="radio" id="radio_auth_settings_<?php echo $option; ?>_no" name="auth_settings[<?php echo $option; ?>]" value="no_warning"<?php checked( 'no_warning' == $auth_settings_option ); ?> /><label for="radio_auth_settings_<?php echo $option; ?>_no"><?php _e( 'Show them the page <strong>without</strong> the anonymous access message', 'authorizer' ); ?></label><br />
			<input type="radio" id="radio_auth_settings_<?php echo $option; ?>" name="auth_settings[<?php echo $option; ?>]" value="warning"<?php checked( 'warning' == $auth_settings_option ); ?> /><label for="radio_auth_settings_<?php echo $option; ?>"><?php _e( 'Show them the page <strong>with</strong> the anonymous access message (marked up as a <a href="http://getbootstrap.com/components/#alerts-dismissible" target="_blank">Bootstrap Dismissible Alert</a>)', 'authorizer' ); ?></label><?php
		}


		function print_wysiwyg_auth_access_redirect_to_message( $args = '' ) {
			// Get plugin option.
			$option = 'access_redirect_to_message';
			$auth_settings_option = $this->get_plugin_option( $option );

			// Print option elements.
			wp_editor(
				wpautop( $auth_settings_option ),
				"auth_settings_$option",
				array(
					'media_buttons' => false,
					'textarea_name' => "auth_settings[$option]",
					'textarea_rows' => 5,
					'tinymce' => true,
					'teeny' => true,
					'quicktags' => false,
				)
			);
		}


		function print_multiselect_auth_access_public_pages( $args = '' ) {
			// Get plugin option.
			$option = 'access_public_pages';
			$auth_settings_option = $this->get_plugin_option( $option );
			$auth_settings_option = is_array( $auth_settings_option ) ? $auth_settings_option : array();

			$post_types = array_merge( array( 'page', 'post' ), get_post_types( array( '_builtin' => false ), 'names' ) );
			$post_types = is_array( $post_types ) ? $post_types : array();

			// Print option elements.
			?><select id="auth_settings_<?php echo $option; ?>" multiple="multiple" name="auth_settings[<?php echo $option; ?>][]">
				<optgroup label="<?php _e( 'Home', 'authorizer' ); ?>">
					<option value="home" <?php echo in_array( 'home', $auth_settings_option ) ? 'selected="selected"' : ''; ?>><?php _e( 'Home Page', 'authorizer' ); ?></option>
					<option value="auth_public_404" <?php echo in_array( 'auth_public_404', $auth_settings_option ) ? 'selected="selected"' : ''; ?>><?php _e( 'Nonexistent (404) Pages', 'authorizer' ); ?></option>
				</optgroup>
				<?php foreach ( $post_types as $post_type ): ?>
					<optgroup label="<?php echo ucfirst( $post_type ); ?>">
					<?php $pages = get_posts( array( 'post_type' => $post_type, 'posts_per_page' => -1 ) ); ?>
					<?php $pages = is_array( $pages ) ? $pages : array(); ?>
					<?php foreach ( $pages as $page ): ?>
						<option value="<?php echo $page->ID; ?>" <?php echo in_array( $page->ID, $auth_settings_option ) ? 'selected="selected"' : ''; ?>><?php echo $page->post_title; ?></option>
					<?php endforeach; ?>
					</optgroup>
				<?php endforeach; ?>
				<optgroup label="<?php _e( 'Categories', 'authorizer' ); ?>">
					<?php foreach ( get_categories() as $category ) : ?>
						<option value="<?php echo 'cat_' . $category->slug; ?>" <?php echo in_array( 'cat_' . $category->slug, $auth_settings_option ) ? 'selected="selected"' : ''; ?>><?php echo $category->name; ?></option>
					<?php endforeach; ?>
				</optgroup>
			<optgroup label="<?php _e( 'Categories', 'authorizer' ); ?>">
				<?php foreach ( get_categories() as $category ) : ?>
					<option value="<?php echo 'cat_' . $category->slug; ?>" <?php echo in_array( 'cat_' . $category->slug, $auth_settings_option ) ? 'selected="selected"' : ''; ?>><?php echo $category->name; ?></option>
				<?php endforeach; ?>
			</optgroup>
			</select><?php
		}


		function print_section_info_external( $args = '' ) {
			?><div id="section_info_external" class="section_info">
				<p><?php _e( 'Enter your external server settings below.', 'authorizer' ); ?></p>
			</div><?php
		}


		function get_admin_mode( $args ) {
			if ( is_array( $args ) && array_key_exists( MULTISITE_ADMIN, $args ) && $args[MULTISITE_ADMIN] === true ) {
				return MULTISITE_ADMIN;
			} else {
				return SINGLE_ADMIN;
			}
		}


		function print_select_auth_access_default_role( $args = '' ) {
			// Get plugin option.
			$option = 'access_default_role';
			$auth_settings_option = $this->get_plugin_option( $option, $this->get_admin_mode( $args ), 'allow override', 'print overlay' );

			// Print option elements.
			?><select id="auth_settings_<?php echo $option; ?>" name="auth_settings[<?php echo $option; ?>]">
				<?php wp_dropdown_roles( $auth_settings_option ); ?>
			</select><?php
		}


		function print_checkbox_auth_external_google( $args = '' ) {
			// Get plugin option.
			$option = 'google';
			$auth_settings_option = $this->get_plugin_option( $option, $this->get_admin_mode( $args ), 'allow override', 'print overlay' );

			// Make sure php5-curl extension is installed on server.
			$curl_installed_message = ! function_exists( 'curl_init' ) ? '<span style="color: red;">(' . __( 'Warning: <a href="http://www.php.net//manual/en/curl.installation.php" target="_blank" style="color: red;">PHP CURL extension</a> is <strong>not</strong> installed', 'authorizer' ) . ')</span>' : '';

			// Print option elements.
			?><input type="checkbox" id="auth_settings_<?php echo $option; ?>" name="auth_settings[<?php echo $option; ?>]" value="1"<?php checked( 1 == $auth_settings_option ); ?> /><label for="auth_settings_<?php echo $option; ?>"><?php _e( 'Enable Google Logins', 'authorizer' ); ?></label> <?php echo $curl_installed_message; ?><?php
		}


		function print_text_google_clientid( $args = '' ) {
			// Get plugin option.
			$option = 'google_clientid';
			$auth_settings_option = $this->get_plugin_option( $option, $this->get_admin_mode( $args ), 'allow override', 'print overlay' );

			// Print option elements.
			$site_url_parts = parse_url( get_site_url() );
			$site_url_host = $site_url_parts['scheme'] . '://' . $site_url_parts['host'] . '/';
			?><?php _e( "If you don't have a Google Client ID and Secret, generate them by following these instructions:", 'authorizer' ); ?>
			<ol>
				<li><?php _e( 'Click <strong>Create a Project</strong> on the <a href="https://cloud.google.com/console" target="_blank">Google Developers Console</a>. You can name it whatever you want.', 'authorizer' ); ?></li>
				<li><?php _e( 'Within the project, navigate to <em>APIs and Auth</em> &gt; <em>Credentials</em>, then click <strong>Create New Client ID</strong> under OAuth. Use these settings:', 'authorizer' ); ?>
					<ul>
						<li><?php _e( 'Application Type: <strong>Web application</strong>', 'authorizer' ); ?></li>
						<li><?php _e( 'Authorized Javascript Origins:', 'authorizer' ); ?> <strong><?php echo $site_url_host; ?></strong></li>
						<li><?php _e( 'Authorized Redirect URI: <em>none</em>', 'authorizer' ); ?></li>
					</ul>
				</li>
				<li><?php _e( 'Copy/paste your new Client ID/Secret pair into the fields below.', 'authorizer' ); ?></li>
				<li><?php _e( '<strong>Note</strong>: Navigate to <em>APIs and Auth</em> &gt; <em>Consent screen</em> to change the way the Google consent screen appears after a user has successfully entered their password, but before they are redirected back to WordPress.', 'authorizer' ); ?></li>
				<li><?php _e( 'Note: Google may have a more recent version of these instructions in their <a href="https://developers.google.com/identity/sign-in/web/devconsole-project" target="_blank">developer documentation</a>.', 'authorizer' ); ?></li>
			</ol>
			<input type="text" id="auth_settings_<?php echo $option; ?>" name="auth_settings[<?php echo $option; ?>]" value="<?php echo $auth_settings_option; ?>" placeholder="1234567890123-kdjr85yt6vjr6d8g7dhr8g7d6durjf7g.apps.googleusercontent.com" style="width:560px;" /><?php
		}


		function print_text_google_clientsecret( $args = '' ) {
			// Get plugin option.
			$option = 'google_clientsecret';
			$auth_settings_option = $this->get_plugin_option( $option, $this->get_admin_mode( $args ), 'allow override', 'print overlay' );

			// Print option elements.
			?><input type="text" id="auth_settings_<?php echo $option; ?>" name="auth_settings[<?php echo $option; ?>]" value="<?php echo $auth_settings_option; ?>" placeholder="sDNgX5_pr_5bly-frKmvp8jT" style="width:220px;" /><?php
		}


		function print_text_google_hosteddomain( $args = '' ) {
			// Get plugin option.
			$option = 'google_hosteddomain';
			$auth_settings_option = $this->get_plugin_option( $option, $this->get_admin_mode( $args ), 'allow override', 'print overlay' );

			// Print option elements.
			?><input type="text" id="auth_settings_<?php echo $option; ?>" name="auth_settings[<?php echo $option; ?>]" value="<?php echo $auth_settings_option; ?>" placeholder="" style="width:220px;" /><br />
			<small><?php _e( 'Restrict Google logins to a specific Google Apps hosted domain (for example, mycollege.edu). Leave blank to allow all Google sign-ins.', 'authorizer' ); ?></small>
			<?php
		}


		function print_checkbox_auth_external_cas( $args = '' ) {
			// Get plugin option.
			$option = 'cas';
			$auth_settings_option = $this->get_plugin_option( $option, $this->get_admin_mode( $args ), 'allow override', 'print overlay' );

			// Make sure php5-curl extension is installed on server.
			$curl_installed_message = ! function_exists( 'curl_init' ) ? __( '<a href="http://www.php.net//manual/en/curl.installation.php" target="_blank" style="color: red;">PHP CURL extension</a> is not installed', 'authorizer' ) : '';

			// Make sure php_openssl extension is installed on server.
			$openssl_installed_message = ! extension_loaded( 'openssl' ) ? __( '<a href="http://stackoverflow.com/questions/23424459/enable-php-openssl-not-working" target="_blank" style="color: red;">PHP openssl extension</a> is not installed', 'authorizer' ) : '';

			// Build error message string.
			$error_message = '';
			if ( strlen( $curl_installed_message ) > 0 || strlen( $openssl_installed_message ) > 0 ) {
				$error_message = '<span style="color: red;">(' .
					__( 'Warning', 'authorizer' ) . ': ' .
					$curl_installed_message .
					( strlen( $curl_installed_message ) > 0 && strlen( $openssl_installed_message ) > 0 ? '; ' : '' ) .
					$openssl_installed_message .
					')</span>';
			}

			// Print option elements.
			?><input type="checkbox" id="auth_settings_<?php echo $option; ?>" name="auth_settings[<?php echo $option; ?>]" value="1"<?php checked( 1 == $auth_settings_option ); ?> /><label for="auth_settings_<?php echo $option; ?>"><?php _e( 'Enable CAS Logins', 'authorizer' ); ?></label> <?php echo $error_message; ?><?php
		}


		function print_text_cas_custom_label( $args = '' ) {
			// Get plugin option.
			$option = 'cas_custom_label';
			$auth_settings_option = $this->get_plugin_option( $option, $this->get_admin_mode( $args ), 'allow override', 'print overlay' );

			// Print option elements.
			?><?php _e( 'The button on the login page will read:', 'authorizer' ); ?><p><a class="button-primary button-large" style="padding: 3px 16px; height: 36px;"><span class="dashicons dashicons-lock" style="margin: 4px 4px 0 0;"></span> <strong><?php _e( 'Sign in with', 'authorizer' ); ?> </strong><input type="text" id="auth_settings_<?php echo $option; ?>" name="auth_settings[<?php echo $option; ?>]" value="<?php echo $auth_settings_option; ?>" placeholder="CAS" style="width: 100px;" /></a></p><?php
		}


		function print_text_cas_host( $args = '' ) {
			// Get plugin option.
			$option = 'cas_host';
			$auth_settings_option = $this->get_plugin_option( $option, $this->get_admin_mode( $args ), 'allow override', 'print overlay' );

			// Print option elements.
			?><input type="text" id="auth_settings_<?php echo $option; ?>" name="auth_settings[<?php echo $option; ?>]" value="<?php echo $auth_settings_option; ?>" placeholder="authn.example.edu" /><?php
		}


		function print_text_cas_port( $args = '' ) {
			// Get plugin option.
			$option = 'cas_port';
			$auth_settings_option = $this->get_plugin_option( $option, $this->get_admin_mode( $args ), 'allow override', 'print overlay' );

			// Print option elements.
			?><input type="text" id="auth_settings_<?php echo $option; ?>" name="auth_settings[<?php echo $option; ?>]" value="<?php echo $auth_settings_option; ?>" placeholder="443" style="width:50px;" /><?php
		}


		function print_text_cas_path( $args = '' ) {
			// Get plugin option.
			$option = 'cas_path';
			$auth_settings_option = $this->get_plugin_option( $option, $this->get_admin_mode( $args ), 'allow override', 'print overlay' );

			// Print option elements.
			?><input type="text" id="auth_settings_<?php echo $option; ?>" name="auth_settings[<?php echo $option; ?>]" value="<?php echo $auth_settings_option; ?>" placeholder="/cas" /><?php
		}


		function print_select_cas_version( $args = '' ) {
			// Get plugin option.
			$option = 'cas_version';
			$auth_settings_option = $this->get_plugin_option( $option, $this->get_admin_mode( $args ), 'allow_override', 'print overlay' );

			// Print option elements.
			?><select id="auth_settings_<?php echo $option; ?>" name="auth_settings[<?php echo $option; ?>]">
				<option value="SAML_VERSION_1_1" <?php selected( $auth_settings_option, 'SAML_VERSION_1_1' ); ?>>SAML_VERSION_1_1</option>
				<option value="CAS_VERSION_3_0" <?php selected( $auth_settings_option, 'CAS_VERSION_3_0' ); ?>>CAS_VERSION_3_0</option>
				<option value="CAS_VERSION_2_0" <?php selected( $auth_settings_option, 'CAS_VERSION_2_0' ); ?>>CAS_VERSION_2_0</option>
				<option value="CAS_VERSION_1_0" <?php selected( $auth_settings_option, 'CAS_VERSION_1_0' ); ?>>CAS_VERSION_1_0</option>
			</select><?php
		}


		function print_text_cas_attr_email( $args = '' ) {
			// Get plugin option.
			$option = 'cas_attr_email';
			$auth_settings_option = $this->get_plugin_option( $option, $this->get_admin_mode( $args ), 'allow override', 'print overlay' );

			// Print option elements.
			?><input type="text" id="auth_settings_<?php echo $option; ?>" name="auth_settings[<?php echo $option; ?>]" value="<?php echo $auth_settings_option; ?>" placeholder="mail" />
			<br /><small><?php _e( "Note: If your CAS server doesn't return an attribute containing an email, you can specify the @domain portion of the email address here, and the email address will be constructed from it and the username. For example, if user 'bob' logs in and his email address should be bob@example.edu, then enter <strong>@example.edu</strong> in this field.", 'authorizer' ); ?></small><?php
		}


		function print_text_cas_attr_first_name( $args = '' ) {
			// Get plugin option.
			$option = 'cas_attr_first_name';
			$auth_settings_option = $this->get_plugin_option( $option, $this->get_admin_mode( $args ), 'allow override', 'print overlay' );

			// Print option elements.
			?><input type="text" id="auth_settings_<?php echo $option; ?>" name="auth_settings[<?php echo $option; ?>]" value="<?php echo $auth_settings_option; ?>" placeholder="givenName" /><?php
		}


		function print_text_cas_attr_last_name( $args = '' ) {
			// Get plugin option.
			$option = 'cas_attr_last_name';
			$auth_settings_option = $this->get_plugin_option( $option, $this->get_admin_mode( $args ), 'allow override', 'print overlay' );

			// Print option elements.
			?><input type="text" id="auth_settings_<?php echo $option; ?>" name="auth_settings[<?php echo $option; ?>]" value="<?php echo $auth_settings_option; ?>" placeholder="sn" /><?php
		}


		function print_checkbox_cas_attr_update_on_login( $args = '' ) {
			// Get plugin option.
			$option = 'cas_attr_update_on_login';
			$auth_settings_option = $this->get_plugin_option( $option, $this->get_admin_mode( $args ), 'allow override', 'print overlay' );

			// Print option elements.
			?><input type="checkbox" id="auth_settings_<?php echo $option; ?>" name="auth_settings[<?php echo $option; ?>]" value="1"<?php checked( 1 == $auth_settings_option ); ?> /><label for="auth_settings_<?php echo $option; ?>"><?php _e( 'Update first and last name fields on login (will overwrite any name the user has supplied in their profile)', 'authorizer' ); ?></label><?php
		}


		function print_checkbox_cas_auto_login( $args = '' ) {
			// Get plugin option.
			$option = 'cas_auto_login';
			$auth_settings_option = $this->get_plugin_option( $option, $this->get_admin_mode( $args ), 'allow override', 'print overlay' );

			// Print option elements.
			?><input type="checkbox" id="auth_settings_<?php echo $option; ?>" name="auth_settings[<?php echo $option; ?>]" value="1"<?php checked( 1 == $auth_settings_option ); ?> /><label for="auth_settings_<?php echo $option; ?>"><?php _e( "Immediately redirect to CAS login form if it's the only enabled external service and WordPress logins are hidden", 'authorizer' ); ?></label>
			<p><small><?php _e( 'Note: This feature will only work if you have checked "Hide WordPress Logins" in Advanced settings, and if CAS is the only enabled service (i.e., no Google or LDAP). If you have enabled CAS Single Sign-On (SSO), and a user has already logged into CAS elsewhere, enabling this feature will allow automatic logins without any user interaction.', 'authorizer' ); ?></small></p><?php
		}


		function print_checkbox_auth_external_ldap( $args = '' ) {
			// Get plugin option.
			$option = 'ldap';
			$auth_settings_option = $this->get_plugin_option( $option, $this->get_admin_mode( $args ), 'allow override', 'print overlay' );

			// Make sure php5-ldap extension is installed on server.
			$ldap_installed_message = ! function_exists( 'ldap_connect' ) ? '<span style="color: red;">(' . __( 'Warning: <a href="http://www.php.net/manual/en/ldap.installation.php" target="_blank" style="color: red;">PHP LDAP extension</a> is <strong>not</strong> installed', 'authorizer' ) . ')</span>' : '';

			// Print option elements.
			?><input type="checkbox" id="auth_settings_<?php echo $option; ?>" name="auth_settings[<?php echo $option; ?>]" value="1"<?php checked( 1 == $auth_settings_option ); ?> /><label for="auth_settings_<?php echo $option; ?>"><?php _e( 'Enable LDAP Logins', 'authorizer' ); ?></label> <?php echo $ldap_installed_message; ?><?php
		}


		function print_text_ldap_host( $args = '' ) {
			// Get plugin option.
			$option = 'ldap_host';
			$auth_settings_option = $this->get_plugin_option( $option, $this->get_admin_mode( $args ), 'allow override', 'print overlay' );

			// Print option elements.
			?><input type="text" id="auth_settings_<?php echo $option; ?>" name="auth_settings[<?php echo $option; ?>]" value="<?php echo $auth_settings_option; ?>" placeholder="ldap.example.edu" /><?php
		}


		function print_text_ldap_port( $args = '' ) {
			// Get plugin option.
			$option = 'ldap_port';
			$auth_settings_option = $this->get_plugin_option( $option, $this->get_admin_mode( $args ), 'allow override', 'print overlay' );

			// Print option elements.
			?><input type="text" id="auth_settings_<?php echo $option; ?>" name="auth_settings[<?php echo $option; ?>]" value="<?php echo $auth_settings_option; ?>" placeholder="389" style="width:50px;" /><?php
		}


		function print_text_ldap_search_base( $args = '' ) {
			// Get plugin option.
			$option = 'ldap_search_base';
			$auth_settings_option = $this->get_plugin_option( $option, $this->get_admin_mode( $args ), 'allow override', 'print overlay' );

			// Print option elements.
			?><input type="text" id="auth_settings_<?php echo $option; ?>" name="auth_settings[<?php echo $option; ?>]" value="<?php echo $auth_settings_option; ?>" placeholder="ou=people,dc=example,dc=edu" style="width:225px;" /><?php
		}


		function print_text_ldap_uid( $args = '' ) {
			// Get plugin option.
			$option = 'ldap_uid';
			$auth_settings_option = $this->get_plugin_option( $option, $this->get_admin_mode( $args ), 'allow override', 'print overlay' );

			// Print option elements.
			?><input type="text" id="auth_settings_<?php echo $option; ?>" name="auth_settings[<?php echo $option; ?>]" value="<?php echo $auth_settings_option; ?>" placeholder="uid" style="width:80px;" /><?php
		}


		function print_text_ldap_attr_email( $args = '' ) {
			// Get plugin option.
			$option = 'ldap_attr_email';
			$auth_settings_option = $this->get_plugin_option( $option, $this->get_admin_mode( $args ), 'allow override', 'print overlay' );

			// Print option elements.
			?><input type="text" id="auth_settings_<?php echo $option; ?>" name="auth_settings[<?php echo $option; ?>]" value="<?php echo $auth_settings_option; ?>" placeholder="mail" />
			<br /><small><?php _e( "Note: If your LDAP server doesn't return an attribute containing an email, you can specify the @domain portion of the email address here, and the email address will be constructed from it and the username. For example, if user 'bob' logs in and his email address should be bob@example.edu, then enter <strong>@example.edu</strong> in this field.", 'authorizer' ); ?></small><?php
		}


		function print_text_ldap_user( $args = '' ) {
			// Get plugin option.
			$option = 'ldap_user';
			$auth_settings_option = $this->get_plugin_option( $option, $this->get_admin_mode( $args ), 'allow override', 'print overlay' );

			// Print option elements.
			?><input type="text" id="auth_settings_<?php echo $option; ?>" name="auth_settings[<?php echo $option; ?>]" value="<?php echo $auth_settings_option; ?>" placeholder="cn=directory-user,ou=specials,dc=example,dc=edu" style="width:330px;" /><?php
		}


		function print_password_ldap_password( $args = '' ) {
			// Get plugin option.
			$option = 'ldap_password';
			$auth_settings_option = $this->get_plugin_option( $option, $this->get_admin_mode( $args ), 'allow override', 'print overlay' );

			// Print option elements.
			?><input type="password" id="garbage_to_stop_autofill" name="garbage" value="" autocomplete="off" style="display:none;" />
			<input type="password" id="auth_settings_<?php echo $option; ?>" name="auth_settings[<?php echo $option; ?>]" value="<?php echo $this->decrypt( base64_decode( $auth_settings_option ) ); ?>" autocomplete="off" /><?php
		}


		function print_checkbox_ldap_tls( $args = '' ) {
			// Get plugin option.
			$option = 'ldap_tls';
			$auth_settings_option = $this->get_plugin_option( $option, $this->get_admin_mode( $args ), 'allow override', 'print overlay' );

			// Print option elements.
			?><input type="checkbox" id="auth_settings_<?php echo $option; ?>" name="auth_settings[<?php echo $option; ?>]" value="1"<?php checked( 1 == $auth_settings_option ); ?> /><label for="auth_settings_<?php echo $option; ?>"><?php _e( 'Use TLS', 'authorizer' ); ?></label><?php
		}


		function print_text_ldap_lostpassword_url( $args = '' ) {
			// Get plugin option.
			$option = 'ldap_lostpassword_url';
			$auth_settings_option = $this->get_plugin_option( $option, $this->get_admin_mode( $args ), 'allow override', 'print overlay' );

			// Print option elements.
			?><input type="text" id="auth_settings_<?php echo $option; ?>" name="auth_settings[<?php echo $option; ?>]" value="<?php echo $auth_settings_option; ?>" placeholder="https://myschool.example.edu:8888/am-forgot-password" style="width: 400px;" /><?php
		}


		function print_text_ldap_attr_first_name( $args = '' ) {
			// Get plugin option.
			$option = 'ldap_attr_first_name';
			$auth_settings_option = $this->get_plugin_option( $option, $this->get_admin_mode( $args ), 'allow override', 'print overlay' );

			// Print option elements.
			?><input type="text" id="auth_settings_<?php echo $option; ?>" name="auth_settings[<?php echo $option; ?>]" value="<?php echo $auth_settings_option; ?>" placeholder="givenname" /><?php
		}


		function print_text_ldap_attr_last_name( $args = '' ) {
			// Get plugin option.
			$option = 'ldap_attr_last_name';
			$auth_settings_option = $this->get_plugin_option( $option, $this->get_admin_mode( $args ), 'allow override', 'print overlay' );

			// Print option elements.
			?><input type="text" id="auth_settings_<?php echo $option; ?>" name="auth_settings[<?php echo $option; ?>]" value="<?php echo $auth_settings_option; ?>" placeholder="sn" /><?php
		}


		function print_checkbox_ldap_attr_update_on_login( $args = '' ) {
			// Get plugin option.
			$option = 'ldap_attr_update_on_login';
			$auth_settings_option = $this->get_plugin_option( $option, $this->get_admin_mode( $args ), 'allow override', 'print overlay' );

			// Print option elements.
			?><input type="checkbox" id="auth_settings_<?php echo $option; ?>" name="auth_settings[<?php echo $option; ?>]" value="1"<?php checked( 1 == $auth_settings_option ); ?> /><label for="auth_settings_<?php echo $option; ?>"><?php _e( 'Update first and last name fields on login (will overwrite any name the user has supplied in their profile)', 'authorizer' ); ?></label><?php
		}


		function print_section_info_advanced( $args = '' ) {
			?><div id="section_info_advanced" class="section_info">
				<p><?php _e( 'You may optionally specify some advanced settings below.', 'authorizer' ); ?></p>
			</div><?php
		}


		function print_text_auth_advanced_lockouts( $args = '' ) {
			// Get plugin option.
			$option = 'advanced_lockouts';
			$auth_settings_option = $this->get_plugin_option( $option, $this->get_admin_mode( $args ), 'allow override', 'print overlay' );

			// Print option elements.
			?><?php _e( 'After', 'authorizer' ); ?>
			<input type="text" id="auth_settings_<?php echo $option; ?>_attempts_1" name="auth_settings[<?php echo $option; ?>][attempts_1]" value="<?php echo $auth_settings_option['attempts_1']; ?>" placeholder="10" style="width:30px;" />
			<?php _e( 'invalid password attempts, delay further attempts on that user for', 'authorizer' ); ?>
			<input type="text" id="auth_settings_<?php echo $option; ?>_duration_1" name="auth_settings[<?php echo $option; ?>][duration_1]" value="<?php echo $auth_settings_option['duration_1']; ?>" placeholder="1" style="width:30px;" />
			<?php _e( 'minute(s).', 'authorizer' ); ?>
			<br />
			<?php _e( 'After', 'authorizer' ); ?>
			<input type="text" id="auth_settings_<?php echo $option; ?>_attempts_2" name="auth_settings[<?php echo $option; ?>][attempts_2]" value="<?php echo $auth_settings_option['attempts_2']; ?>" placeholder="10" style="width:30px;" />
			<?php _e( 'more invalid attempts, increase the delay to', 'authorizer' ); ?>
			<input type="text" id="auth_settings_<?php echo $option; ?>_duration_2" name="auth_settings[<?php echo $option; ?>][duration_2]" value="<?php echo $auth_settings_option['duration_2']; ?>" placeholder="10" style="width:30px;" />
			<?php _e( 'minutes.', 'authorizer' ); ?>
			<br />
			<?php _e( 'Reset the delays after', 'authorizer' ); ?>
			<input type="text" id="auth_settings_<?php echo $option; ?>_reset_duration" name="auth_settings[<?php echo $option; ?>][reset_duration]" value="<?php echo $auth_settings_option['reset_duration']; ?>" placeholder="240" style="width:40px;" />
			<?php _e( 'minutes with no invalid attempts.', 'authorizer' ); ?><?php
		}


		function print_checkbox_auth_advanced_hide_wp_login( $args = '' ) {
			// Get plugin option.
			$option = 'advanced_hide_wp_login';
			$auth_settings_option = $this->get_plugin_option( $option, $this->get_admin_mode( $args ), 'allow override', 'print overlay' );

			// Print option elements.
			?><input type="checkbox" id="auth_settings_<?php echo $option; ?>" name="auth_settings[<?php echo $option; ?>]" value="1"<?php checked( 1 == $auth_settings_option ); ?> /><label for="auth_settings_<?php echo $option; ?>"><?php _e( 'Hide WordPress Logins', 'authorizer' ); ?></label>
			<p><small><?php _e( 'Note: You can always access the WordPress logins by adding external=wordpress to the wp-login URL, like so:', 'authorizer' ); ?><br /><a href="<?php echo wp_login_url(); ?>?external=wordpress" target="_blank"><?php echo wp_login_url(); ?>?external=wordpress</a>.</p><?php
		}


		function print_radio_auth_advanced_branding( $args = '' ) {
			// Get plugin option.
			$option = 'advanced_branding';
			$auth_settings_option = $this->get_plugin_option( $option );

			// Print option elements.
			?><input type="radio" id="radio_auth_settings_<?php echo $option; ?>_default" name="auth_settings[<?php echo $option; ?>]" value="default"<?php checked( 'default' == $auth_settings_option ); ?> /><label for="radio_auth_settings_<?php echo $option; ?>_default"><?php _e( 'Default WordPress login screen', 'authorizer' ); ?></label><br />
			<?php

			/**
			 * Developers can use the `authorizer_add_branding_option` filter
			 * to add a radio button for "Custom WordPress login branding"
			 * under the "Advanced" tab in Authorizer options. Example:
			 *
			 * function my_authorizer_add_branding_option( $branding_options ) {
			 *   $new_branding_option = array(
			 *    'value' => 'your_brand'
			 *    'description' => 'Custom Your Brand Login Screen',
			 *    'css_url' => 'http://url/to/your_brand.css',
			 *    'js_url' => 'http://url/to/your_brand.js',
			 *   );
			 *   array_push( $branding_options, $new_branding_option );
			 *   return $branding_options;
			 * }
			 * add_filter( 'authorizer_add_branding_option', 'my_authorizer_add_branding_option' );
			 */
			$branding_options = array();
			$branding_options = apply_filters( 'authorizer_add_branding_option', $branding_options );
			foreach ( $branding_options as $branding_option ) {
				// Make sure the custom brands have the required values
				if ( ! ( is_array( $branding_option ) && array_key_exists( 'value', $branding_option ) && array_key_exists( 'description', $branding_option ) ) ) {
					continue;
				}
				?><input type="radio" id="radio_auth_settings_<?php echo $option; ?>_<?php echo sanitize_title( $branding_option['value'] ); ?>" name="auth_settings[<?php echo $option; ?>]" value="<?php echo $branding_option['value']; ?>"<?php checked( $branding_option['value'] == $auth_settings_option ); ?> /><label for="radio_auth_settings_<?php echo $option; ?>_<?php echo sanitize_title( $branding_option['value'] ); ?>"><?php echo $branding_option['description']; ?></label><br /><?php
			}

			// Print message about adding custom brands if there are none.
			if ( count( $branding_options ) === 0 ) {
				?><p><em><?php _e( '<strong>Note for theme developers</strong>: Add more options here by using the `authorizer_add_branding_option` filter in your theme. You can see an example theme that implements this filter in the plugin directory under sample-theme-add-branding.', 'authorizer' ); ?></em></p><?php
			}
		}


		function print_radio_auth_advanced_admin_menu( $args = '' ) {
			// Get plugin option.
			$option = 'advanced_admin_menu';
			$auth_settings_option = $this->get_plugin_option( $option );

			// Print option elements.
			?><input type="radio" id="radio_auth_settings_<?php echo $option; ?>_settings" name="auth_settings[<?php echo $option; ?>]" value="settings"<?php checked( 'settings' == $auth_settings_option ); ?> /><label for="radio_auth_settings_<?php echo $option; ?>_settings"><?php _e( 'Show in Settings menu', 'authorizer' ); ?></label><br />
			<input type="radio" id="radio_auth_settings_<?php echo $option; ?>_top" name="auth_settings[<?php echo $option; ?>]" value="top"<?php checked( 'top' == $auth_settings_option ); ?> /><label for="radio_auth_settings_<?php echo $option; ?>_top"><?php _e( 'Show in sidebar (top level)', 'authorizer' ); ?></label><br /><?php

		}


		function print_select_auth_advanced_usermeta( $args = '' ) {
			// Get plugin option.
			$option = 'advanced_usermeta';
			$auth_settings_option = $this->get_plugin_option( $option );

			// Print option elements.
			?><select id="auth_settings_<?php echo $option; ?>" name="auth_settings[<?php echo $option; ?>]">
				<option value=""><?php _e( '-- None --', 'authorizer' ); ?></option>
				<?php if ( class_exists( 'acf' ) ) :
					// Get ACF 5 fields. Note: it would be much easier to use `get_field_objects()`
					// or `get_field_objects( 'user_' . get_current_user_id() )`, but neither will
					// list fields that have never been given values for users (i.e., new ACF
					// fields). Therefore we fall back on finding any ACF fields applied to users
					// (user_role or user_form location rules in the field group definition).
					$fields = array();
					$acf_field_group_ids = array();
					$acf_field_groups = new WP_Query( array(
						'post_type' => 'acf-field-group',
					));
					while ( $acf_field_groups->have_posts() ) : $acf_field_groups->the_post();
						if ( strpos( get_the_content(), 's:5:"param";s:9:"user_role"' ) !== false || strpos( get_the_content(), 's:5:"param";s:9:"user_form"' ) !== false ) :
							array_push( $acf_field_group_ids, get_the_ID() );
						endif;
					endwhile; wp_reset_postdata();
					foreach ( $acf_field_group_ids as $acf_field_group_id ) :
						$acf_fields = new WP_Query( array(
							'post_type' => 'acf-field',
							'post_parent' => $acf_field_group_id,
						));
						while ( $acf_fields->have_posts() ) : $acf_fields->the_post();
							global $post;
							$fields[$post->post_name] = get_field_object( $post->post_name );
						endwhile; wp_reset_postdata();
					endforeach;
					// Get ACF 4 fields.
					$acf4_field_groups = new WP_Query( array(
						'post_type' => 'acf',
					));
					while ( $acf4_field_groups->have_posts() ) : $acf4_field_groups->the_post();
						$field_group_rules = get_post_meta( get_the_ID(), 'rule', true );
						if ( is_array( $field_group_rules ) && array_key_exists( 'param', $field_group_rules ) && $field_group_rules['param'] === 'ef_user' ) :
							$acf4_fields = get_post_custom( get_the_ID() );
							foreach ( $acf4_fields as $meta_key => $meta_value ) :
								if ( strpos( $meta_key, 'field_' ) === 0 ) :
									$meta_value = unserialize( $meta_value[0] );
									$fields[$meta_key] = $meta_value;
								endif;
							endforeach;
						endif;
					endwhile; wp_reset_postdata(); ?>
					<optgroup label="ACF User Fields:">
						<?php foreach ( (array)$fields as $field => $field_object ) : ?>
							<option value="acf___<?php echo $field_object['key']; ?>"<?php if ( $auth_settings_option === "acf___{$field_object['key']}" ) echo ' selected="selected"'; ?>><?php echo $field_object['label']; ?></option>
						<?php endforeach; ?>
					</optgroup>
				<?php endif; ?>
				<optgroup label="<?php _e( 'All Usermeta:', 'authorizer' ); ?>">
					<?php foreach ( $this->get_all_usermeta_keys() as $meta_key ) : if ( substr( $meta_key, 0, 3 ) === 'wp_' ) continue; ?>
						<option value="<?php echo $meta_key; ?>"<?php if ( $auth_settings_option === $meta_key ) echo ' selected="selected"'; ?>><?php echo $meta_key; ?></option>
					<?php endforeach; ?>
				</optgroup>
			<optgroup label="<?php _e( 'All Usermeta:', 'authorizer' ); ?>">
				<?php foreach ( $this->get_all_usermeta_keys() as $meta_key ) : if ( substr( $meta_key, 0, 3 ) === 'wp_' ) continue; ?>
					<option value="<?php echo $meta_key; ?>"<?php if ( $auth_settings_option === $meta_key ) echo ' selected="selected"'; ?>><?php echo $meta_key; ?></option>
				<?php endforeach; ?>
			</optgroup>
			</select><?php
		}


		function print_checkbox_auth_advanced_override_multisite( $args = '' ) {
			// Get plugin option.
			$option = 'advanced_override_multisite';
			$auth_settings_option = $this->get_plugin_option( $option );

			// Print option elements.
			?><input type="checkbox" id="auth_settings_<?php echo $option; ?>" name="auth_settings[<?php echo $option; ?>]" value="1"<?php checked( 1 == $auth_settings_option ); ?> /><label for="auth_settings_<?php echo $option; ?>"><?php _e( "Configure this site independently (don't inherit any multisite settings)", 'authorizer' ); ?></label><?php
		}



		/**
		 * Add help documentation to the options page.
		 * Run on action hook chain: load-settings_page_authorizer > admin_head
		 */
		public function admin_head() {
			$screen = get_current_screen();

			// Add help tab for Access Lists Settings
			$help_auth_settings_access_lists_content = '
				<p>' . __( "<strong>Pending Users</strong>: Pending users are users who have successfully logged in to the site, but who haven't yet been approved (or blocked) by you.", 'authorizer' ) .'</p>
				<p>' . __( "<strong>Approved Users</strong>: Approved users have access to the site once they successfully log in.", 'authorizer' ) . '</p>
				<p>' . __( "<strong>Blocked Users</strong>: Blocked users will receive an error message when they try to visit the site after authenticating.", 'authorizer' ) . '</p>
				<p>' . __( "Users in the <strong>Pending</strong> list appear automatically after a new user tries to log in from the configured external authentication service. You can add users to the <strong>Approved</strong> or <strong>Blocked</strong> lists by typing them in manually, or by clicking the <em>Approve</em> or <em>Block</em> buttons next to a user in the <strong>Pending</strong> list.", 'authorizer' ) . '</p>
			';
			$screen->add_help_tab(
				array(
					'id' => 'help_auth_settings_access_lists_content',
					'title' => __( 'Access Lists', 'authorizer' ),
					'content' => $help_auth_settings_access_lists_content,
				)
			);

			// Add help tab for Login Access Settings
			$help_auth_settings_access_login_content = '
				<p>' . __( "<strong>Who can log in to the site?</strong>: Choose the level of access restriction you'd like to use on your site here. You can leave the site open to anyone with a WordPress account or an account on an external service like Google, CAS, or LDAP, or restrict it to WordPress users and only the external users that you specify via the <em>Access Lists</em>.", 'authorizer' ) . '</p>
				<p>' . __( "<strong>Which role should receive email notifications about pending users?</strong>: If you've restricted access to <strong>approved users</strong>, you can determine which WordPress users will receive a notification email everytime a new external user successfully logs in and is added to the pending list. All users of the specified role will receive an email, and the external user will get a message (specified below) telling them their access is pending approval.", 'authorizer' ) . '</p>
				<p>' . __( '<strong>What message should pending users see after attempting to log in?</strong>: Here you can specify the exact message a new external user will see once they try to log in to the site for the first time.', 'authorizer' ) . '</p>
			';
			$screen->add_help_tab(
				array(
					'id' => 'help_auth_settings_access_login_content',
					'title' => __( 'Login Access', 'authorizer' ),
					'content' => $help_auth_settings_access_login_content,
				)
			);

			// Add help tab for Public Access Settings
			$help_auth_settings_access_public_content = '
				<p>' . __( "<strong>Who can view the site?</strong>: You can restrict the site's visibility by only allowing logged in users to see pages. If you do so, you can customize the specifics about the site's privacy using the settings below.", 'authorizer' ) . '</p>
				<p>' . __( "<strong>What pages (if any) should be available to everyone?</strong>: If you'd like to declare certain pages on your site as always public (such as the course syllabus, introduction, or calendar), specify those pages here. These pages will always be available no matter what access restrictions exist.", 'authorizer' ) . '</p>
				<p>' . __( "<strong>What happens to people without access when they visit a <em>private</em> page?</strong>: Choose the response anonymous users receive when visiting the site. You can choose between immediately taking them to the <strong>login screen</strong>, or simply showing them a <strong>message</strong>.", 'authorizer' ) . '</p>
				<p>' . __( "<strong>What happens to people without access when they visit a <em>public</em> page?</strong>: Choose the response anonymous users receive when visiting a page on the site marked as public. You can choose between showing them the page without any message, or showing them a the page with a message above the content.", 'authorizer' ) . '</p>
				<p>' . __( "<strong>What message should people without access see?</strong>: If you chose to show new users a <strong>message</strong> above, type that message here.", 'authorizer' ) . '</p>
			';
			$screen->add_help_tab(
				array(
					'id' => 'help_auth_settings_access_public_content',
					'title' => __( 'Public Access', 'authorizer' ),
					'content' => $help_auth_settings_access_public_content,
				)
			);

			// Add help tab for External Service (CAS, LDAP) Settings
			$help_auth_settings_external_content = '
				<p>' . __( "<strong>Type of external service to authenticate against</strong>: Choose which authentication service type you will be using. You'll have to fill out different fields below depending on which service you choose.", 'authorizer' ) . '</p>
				<p>' . __( "<strong>Enable Google Logins</strong>: Choose if you want to allow users to log in with their Google Account credentials. You will need to enter your API Client ID and Secret to enable Google Logins.", 'authorizer' ) . '</p>
				<p>' . __( "<strong>Enable CAS Logins</strong>: Choose if you want to allow users to log in with via CAS (Central Authentication Service). You will need to enter details about your CAS server (host, port, and path) to enable CAS Logins.", 'authorizer' ) . '</p>
				<p>' . __( "<strong>Enable LDAP Logins</strong>: Choose if you want to allow users to log in with their LDAP (Lightweight Directory Access Protocol) credentials. You will need to enter details about your LDAP server (host, port, search base, uid attribute, directory user, directory user password, and whether to use TLS) to enable Google Logins.", 'authorizer' ) . '</p>
				<p>' . __( "<strong>Default role for new CAS users</strong>: Specify which role new external users will get by default. Be sure to choose a role with limited permissions!", 'authorizer' ) . '</p>
				<p><strong><em>' . __( "If you enable Google logins:", 'authorizer' ) . '</em></strong></p>
				<ul>
					<li>' . __( "<strong>Google Client ID</strong>: You can generate this ID by creating a new Project in the <a href='https://cloud.google.com/console'>Google Developers Console</a>. A Client ID typically looks something like this: 1234567890123-kdjr85yt6vjr6d8g7dhr8g7d6durjf7g.apps.googleusercontent.com", 'authorizer' ) . '</li>
					<li>' . __( "<strong>Google Client Secret</strong>: You can generate this secret by creating a new Project in the <a href='https://cloud.google.com/console'>Google Developers Console</a>. A Client Secret typically looks something like this: sDNgX5_pr_5bly-frKmvp8jT", 'authorizer' ) . '</li>
				</ul>
				<p><strong><em>' . __( "If you enable CAS logins:", 'authorizer' ) . '</em></strong></p>
				<ul>
					<li>' . __( "<strong>CAS server hostname</strong>: Enter the hostname of the CAS server you authenticate against (e.g., authn.example.edu).", 'authorizer' ) . '</li>
					<li>' . __( "<strong>CAS server port</strong>: Enter the port on the CAS server to connect to (e.g., 443).", 'authorizer' ) . '</li>
					<li>' . __( "<strong>CAS server path/context</strong>: Enter the path to the login endpoint on the CAS server (e.g., /cas).", 'authorizer' ) . '</li>
					<li>' . __( "<strong>CAS attribute containing first name</strong>: Enter the CAS attribute that has the user's first name. When this user first logs in, their WordPress account will have their first name retrieved from CAS and added to their WordPress profile.", 'authorizer' ) . '</li>
					<li>' . __( "<strong>CAS attribute containing last name</strong>: Enter the CAS attribute that has the user's last name. When this user first logs in, their WordPress account will have their last name retrieved from CAS and added to their WordPress profile.", 'authorizer' ) . '</li>
					<li>' . __( "<strong>CAS attribute update</strong>: Select whether the first and last names retrieved from CAS should overwrite any value the user has entered in the first and last name fields in their WordPress profile. If this is not set, this only happens the first time they log in.", 'authorizer' ) . '</li>
				</ul>
				<p><strong><em>' . __( "If you enable LDAP logins:", 'authorizer' ) . '</em></strong></p>
				<ul>
					<li>' . __( "<strong>LDAP Host</strong>: Enter the URL of the LDAP server you authenticate against.", 'authorizer' ) . '</li>
					<li>' . __( "<strong>LDAP Port</strong>: Enter the port number that the LDAP server listens on.", 'authorizer' ) . '</li>
					<li>' . __( "<strong>LDAP Search Base</strong>: Enter the LDAP string that represents the search base, e.g., ou=people,dc=example,dc=edu", 'authorizer' ) . '</li>
					<li>' . __( "<strong>LDAP attribute containing username</strong>: Enter the name of the LDAP attribute that contains the usernames used by those attempting to log in. The plugin will search on this attribute to find the cn to bind against for login attempts.", 'authorizer' ) . '</li>
					<li>' . __( "<strong>LDAP Directory User</strong>: Enter the name of the LDAP user that has permissions to browse the directory.", 'authorizer' ) . '</li>
					<li>' . __( "<strong>LDAP Directory User Password</strong>: Enter the password for the LDAP user that has permission to browse the directory.", 'authorizer' ) . '</li>
					<li>' . __( "<strong>Secure Connection (TLS)</strong>: Select whether all communication with the LDAP server should be performed over a TLS-secured connection.", 'authorizer' ) . '</li>
					<li>' . __( "<strong>Custom lost password URL</strong>: The WordPress login page contains a link to recover a lost password. If you have external users who shouldn't change the password on their WordPress account, point them to the appropriate location to change the password on their external authentication service here.", 'authorizer' ) . '</li>
					<li>' . __( "<strong>LDAP attribute containing first name</strong>: Enter the LDAP attribute that has the user's first name. When this user first logs in, their WordPress account will have their first name retrieved from LDAP and added to their WordPress profile.", 'authorizer' ) . '</li>
					<li>' . __( "<strong>LDAP attribute containing last name</strong>: Enter the LDAP attribute that has the user's last name. When this user first logs in, their WordPress account will have their last name retrieved from LDAP and added to their WordPress profile.", 'authorizer' ) . '</li>
					<li>' . __( "<strong>LDAP attribute update</strong>: Select whether the first and last names retrieved from LDAP should overwrite any value the user has entered in the first and last name fields in their WordPress profile. If this is not set, this only happens the first time they log in.", 'authorizer' ) . '</li>
				</ul>
			';
			$screen->add_help_tab(
				array(
					'id' => 'help_auth_settings_external_content',
					'title' => __( 'External Service', 'authorizer' ),
					'content' => $help_auth_settings_external_content,
				)
			);

			// Add help tab for Advanced Settings
			$help_auth_settings_advanced_content = '
				<p>' . __( "<strong>Limit invalid login attempts</strong>: Choose how soon (and for how long) to restrict access to individuals (or bots) making repeated invalid login attempts. You may set a shorter delay first, and then a longer delay after repeated invalid attempts; you may also set how much time must pass before the delays will be reset to normal.", 'authorizer' ) . '</p>
				<p>' . __( "<strong>Hide WordPress Logins</strong>: If you want to hide the WordPress username and password fields and the Log In button on the wp-login screen, enable this option. Note: You can always access the WordPress logins by adding external=wordpress to the wp-login URL, like so:", 'authorizer' ) . ' <a href="' . wp_login_url() . '?external=wordpress" target="_blank">' . wp_login_url() . '?external=wordpress</a>.</p>
				<p>' . __( "<strong>Custom WordPress login branding</strong>: If you'd like to use custom branding on the WordPress login page, select that here. You will need to use the `authorizer_add_branding_option` filter in your theme to add it. You can see an example theme that implements this filter in the plugin directory under sample-theme-add-branding.", 'authorizer' ) . '</p>
			';
			$screen->add_help_tab(
				array(
					'id' => 'help_auth_settings_advanced_content',
					'title' => __( 'Advanced', 'authorizer' ),
					'content' => $help_auth_settings_advanced_content,
				)
			);
		}



		/**
		 * ***************************
		 * Multisite: Network Admin Options page
		 * ***************************
		 */


		/**
		 * Network Admin menu item
		 * Hook: network_admin_menu
		 *
		 * @param none
		 * @return void
		 */
		public function network_admin_menu() {
			// @see http://codex.wordpress.org/Function_Reference/add_menu_page
			add_menu_page(
				'Authorizer', // Page title
				'Authorizer', // Menu title
				'manage_network_options', // Capability
				'authorizer', // Menu slug
				array( $this, 'create_network_admin_page' ),
				'dashicons-groups', // Icon URL
				89 // Position
			);
		}


		/**
		 * Output the HTML for the options page
		 */
		public function create_network_admin_page() {
			if ( ! current_user_can( 'manage_network_options' ) ) {
				wp_die( __( 'You do not have sufficient permissions to access this page.', 'authorizer' ) );
			}
			$auth_settings = get_blog_option( BLOG_ID_CURRENT_SITE, 'auth_multisite_settings', array() ); ?>
			<div class="wrap">
				<form method="post" action="" autocomplete="off">
					<h2><?php _e( 'Authorizer Settings', 'authorizer' ); ?></h2>
					<p><?php _e( 'Most <strong>Authorizer</strong> settings are set in the individual sites, but you can specify a few options here that apply to <strong>all sites in the network</strong>. These settings will override settings in the individual sites.', 'authorizer' ); ?></p>

					<input type="checkbox" id="auth_settings_multisite_override" name="auth_settings[multisite_override]" value="1"<?php checked( 1 == $auth_settings['multisite_override'] ); ?> /><label for="auth_settings_multisite_override"><?php _e( 'Override individual site settings with the settings below', 'authorizer' ); ?></label>

					<div id="auth_multisite_settings_disabled_overlay" style="display: none;"></div>

					<div class="wrap" id="auth_multisite_settings">
						<?php $this->print_section_info_tabs( array( MULTISITE_ADMIN => true ) ); ?>

						<?php wp_nonce_field( 'save_auth_settings', 'nonce_save_auth_settings' ); ?>

						<?php // Custom access lists (for network, we only really want approved list, not pending or blocked) ?>
						<div id="section_info_access_lists" class="section_info">
							<p><?php _e( 'Manage who has access to all sites in the network.', 'authorizer' ); ?></p>
						</div>
						<table class="form-table"><tbody>
							<tr>
								<th scope="row"><?php _e( 'Who can log in to sites in this network?', 'authorizer' ); ?></th>
								<td><?php $this->print_radio_auth_access_who_can_login( array( MULTISITE_ADMIN => true ) ); ?></td>
							</tr>
							<tr>
								<th scope="row"><?php _e( 'Who can view sites in this network?', 'authorizer' ); ?></th>
								<td><?php $this->print_radio_auth_access_who_can_view( array( MULTISITE_ADMIN => true ) ); ?></td>
							</tr>
							<tr>
								<th scope="row"><?php _e( 'Approved Users (All Sites)', 'authorizer' ); ?><br /><small><em><?php _e( 'Note: these users will <strong>not</strong> receive welcome emails when approved. Only users approved from individual sites can receive these messages.', 'authorizer' ); ?></em></small></th>
								<td><?php $this->print_combo_auth_access_users_approved( array( MULTISITE_ADMIN => true ) ); ?></td>
							</tr>
						</tbody></table>

						<?php $this->print_section_info_external(); ?>
						<table class="form-table"><tbody>
							<tr>
								<th scope="row"><?php _e( 'Default role for new users', 'authorizer' ); ?></th>
								<td><?php $this->print_select_auth_access_default_role( array( MULTISITE_ADMIN => true ) ); ?></td>
							</tr>
							<tr>
								<th scope="row"><?php _e( 'Google Logins', 'authorizer' ); ?></th>
								<td><?php $this->print_checkbox_auth_external_google( array( MULTISITE_ADMIN => true ) ); ?></td>
							</tr>
							<tr>
								<th scope="row"><?php _e( 'Google Client ID', 'authorizer' ); ?></th>
								<td><?php $this->print_text_google_clientid( array( MULTISITE_ADMIN => true ) ); ?></td>
							</tr>
							<tr>
								<th scope="row"><?php _e( 'Google Client Secret', 'authorizer' ); ?></th>
								<td><?php $this->print_text_google_clientsecret( array( MULTISITE_ADMIN => true ) ); ?></td>
							</tr>
							<tr>
								<th scope="row"><?php _e( 'Google Hosted Domain', 'authorizer' ); ?></th>
								<td><?php $this->print_text_google_hosteddomain( array( MULTISITE_ADMIN => true ) ); ?></td>
							</tr>
							<tr>
								<th scope="row"><?php _e( 'CAS Logins', 'authorizer' ); ?></th>
								<td><?php $this->print_checkbox_auth_external_cas( array( MULTISITE_ADMIN => true ) ); ?></td>
							</tr>
							<tr>
								<th scope="row"><?php _e( 'CAS Custom Label', 'authorizer' ); ?></th>
								<td><?php $this->print_text_cas_custom_label( array( MULTISITE_ADMIN => true ) ); ?></td>
							</tr>
							<tr>
								<th scope="row"><?php _e( 'CAS server hostname', 'authorizer' ); ?></th>
								<td><?php $this->print_text_cas_host( array( MULTISITE_ADMIN => true ) ); ?></td>
							</tr>
							<tr>
								<th scope="row"><?php _e( 'CAS server port', 'authorizer' ); ?></th>
								<td><?php $this->print_text_cas_port( array( MULTISITE_ADMIN => true ) ); ?></td>
							</tr>
							<tr>
								<th scope="row"><?php _e( 'CAS server path/context', 'authorizer' ); ?></th>
								<td><?php $this->print_text_cas_path( array( MULTISITE_ADMIN => true ) ); ?></td>
							</tr>
							<tr>
								<th scope="row"><?php _e( 'CAS server version', 'authorizer' ); ?></th>
								<td><?php $this->print_select_cas_version( array( MULTISITE_ADMIN => true ) ); ?></td>
							</tr>
							<tr>
								<th scope="row"><?php _e( 'CAS attribute containing email', 'authorizer' ); ?></th>
								<td><?php $this->print_text_cas_attr_email( array( MULTISITE_ADMIN => true ) ); ?></td>
							</tr>
							<tr>
								<th scope="row"><?php _e( 'CAS attribute containing first name', 'authorizer' ); ?></th>
								<td><?php $this->print_text_cas_attr_first_name( array( MULTISITE_ADMIN => true ) ); ?></td>
							</tr>
							<tr>
								<th scope="row"><?php _e( 'CAS attribute containing last name', 'authorizer' ); ?></th>
								<td><?php $this->print_text_cas_attr_last_name( array( MULTISITE_ADMIN => true ) ); ?></td>
							</tr>
							<tr>
								<th scope="row"><?php _e( 'CAS attribute update', 'authorizer' ); ?></th>
								<td><?php $this->print_checkbox_cas_attr_update_on_login( array( MULTISITE_ADMIN => true ) ); ?></td>
							</tr>
							<tr>
								<th scope="row"><?php _e( 'CAS automatic login', 'authorizer' ); ?></th>
								<td><?php $this->print_checkbox_cas_auto_login( array( MULTISITE_ADMIN => true ) ); ?></td>
							</tr>
							<tr>
								<th scope="row"><?php _e( 'LDAP Logins', 'authorizer' ); ?></th>
								<td><?php $this->print_checkbox_auth_external_ldap( array( MULTISITE_ADMIN => true ) ); ?></td>
							</tr>
							<tr>
								<th scope="row"><?php _e( 'LDAP Host', 'authorizer' ); ?></th>
								<td><?php $this->print_text_ldap_host( array( MULTISITE_ADMIN => true ) ); ?></td>
							</tr>
							<tr>
								<th scope="row"><?php _e( 'LDAP Port', 'authorizer' ); ?></th>
								<td><?php $this->print_text_ldap_port( array( MULTISITE_ADMIN => true ) ); ?></td>
							</tr>
							<tr>
								<th scope="row"><?php _e( 'LDAP Search Base', 'authorizer' ); ?></th>
								<td><?php $this->print_text_ldap_search_base( array( MULTISITE_ADMIN => true ) ); ?></td>
							</tr>
							<tr>
								<th scope="row"><?php _e( 'LDAP attribute containing username', 'authorizer' ); ?></th>
								<td><?php $this->print_text_ldap_uid( array( MULTISITE_ADMIN => true ) ); ?></td>
							</tr>
							<tr>
								<th scope="row"><?php _e( 'LDAP attribute containing email', 'authorizer' ); ?></th>
								<td><?php $this->print_text_ldap_attr_email( array( MULTISITE_ADMIN => true ) ); ?></td>
							</tr>
							<tr>
								<th scope="row"><?php _e( 'LDAP Directory User', 'authorizer' ); ?></th>
								<td><?php $this->print_text_ldap_user( array( MULTISITE_ADMIN => true ) ); ?></td>
							</tr>
							<tr>
								<th scope="row"><?php _e( 'LDAP Directory User Password', 'authorizer' ); ?></th>
								<td><?php $this->print_password_ldap_password( array( MULTISITE_ADMIN => true ) ); ?></td>
							</tr>
							<tr>
								<th scope="row"><?php _e( 'Secure Connection (TLS)', 'authorizer' ); ?></th>
								<td><?php $this->print_checkbox_ldap_tls( array( MULTISITE_ADMIN => true ) ); ?></td>
							</tr>
							<tr>
								<th scope="row"><?php _e( 'Custom lost password URL', 'authorizer' ); ?></th>
								<td><?php $this->print_text_ldap_lostpassword_url( array( MULTISITE_ADMIN => true ) ); ?></td>
							</tr>
							<tr>
								<th scope="row"><?php _e( 'LDAP attribute containing first name', 'authorizer' ); ?></th>
								<td><?php $this->print_text_ldap_attr_first_name( array( MULTISITE_ADMIN => true ) ); ?></td>
							</tr>
							<tr>
								<th scope="row"><?php _e( 'LDAP attribute containing last name', 'authorizer' ); ?></th>
								<td><?php $this->print_text_ldap_attr_last_name( array( MULTISITE_ADMIN => true ) ); ?></td>
							</tr>
							<tr>
								<th scope="row"><?php _e( 'LDAP attribute update', 'authorizer' ); ?></th>
								<td><?php $this->print_checkbox_ldap_attr_update_on_login( array( MULTISITE_ADMIN => true ) ); ?></td>
							</tr>
						</tbody></table>

						<?php $this->print_section_info_advanced(); ?>
						<table class="form-table"><tbody>
							<tr>
								<th scope="row"><?php _e( 'Limit invalid login attempts', 'authorizer' ); ?></th>
								<td><?php $this->print_text_auth_advanced_lockouts( array( MULTISITE_ADMIN => true ) ); ?></td>
							</tr>
							<tr>
								<th scope="row"><?php _e( 'Hide WordPress Logins', 'authorizer' ); ?></th>
								<td><?php $this->print_checkbox_auth_advanced_hide_wp_login( array( MULTISITE_ADMIN => true ) ); ?></td>
							</tr>
						</tbody></table>

						<br class="clear" />
					</div>
					<input type="button" name="submit" id="submit" class="button button-primary" value="<?php _e( 'Save Changes', 'authorizer' ); ?>" onclick="save_auth_multisite_settings(this);" />
				</form>
			</div>
			<?php
		}


		/**
		 * Save multisite settings (ajax call).
		 */
		function ajax_save_auth_multisite_settings() {
			// Fail silently if current user doesn't have permissions.
			if ( ! current_user_can( 'manage_network_options' ) ) {
				die( '' );
			}

			// Make sure nonce exists.
			if ( empty( $_POST['nonce_save_auth_settings'] ) ) {
				die( '' );
			}

			// Nonce check.
			if ( ! wp_verify_nonce( $_POST['nonce_save_auth_settings'], 'save_auth_settings' ) ) {
				die( '' );
			}

			// Assert multisite.
			if ( ! is_multisite() ) {
				die( '' );
			}

			// Get multisite settings.
			$auth_multisite_settings = get_blog_option( BLOG_ID_CURRENT_SITE, 'auth_multisite_settings', array() );

			// Sanitize settings
			$auth_multisite_settings = $this->sanitize_options( $_POST );

			// Filter options to only the allowed values (multisite options are a subset of all options)
			$allowed = array(
				'multisite_override',
				'access_who_can_login',
				'access_who_can_view',
				'access_default_role',
				'google',
				'google_clientid',
				'google_clientsecret',
				'google_hosteddomain',
				'cas',
				'cas_custom_label',
				'cas_host',
				'cas_port',
				'cas_path',
				'cas_version',
				'cas_attr_email',
				'cas_attr_first_name',
				'cas_attr_last_name',
				'cas_attr_update_on_login',
				'cas_auto_login',
				'ldap',
				'ldap_host',
				'ldap_port',
				'ldap_search_base',
				'ldap_uid',
				'ldap_attr_email',
				'ldap_user',
				'ldap_password',
				'ldap_tls',
				'ldap_lostpassword_url',
				'ldap_attr_first_name',
				'ldap_attr_last_name',
				'ldap_attr_update_on_login',
				'advanced_lockouts',
				'advanced_hide_wp_login',
			);
			$auth_multisite_settings = array_intersect_key( $auth_multisite_settings, array_flip( $allowed ) );

			// Update multisite settings in database.
			update_blog_option( BLOG_ID_CURRENT_SITE, 'auth_multisite_settings', $auth_multisite_settings );

			// Return 'success' value to AJAX call.
			die( 'success' );
		}



		/**
		 * ***************************
		 * Dashboard widget
		 * ***************************
		 */



		function add_dashboard_widgets() {
			// Only users who can edit can see the authorizer dashboard widget
			if ( current_user_can( 'create_users' ) ) {
				// Add dashboard widget for adding/editing users with access
				wp_add_dashboard_widget( 'auth_dashboard_widget', __( 'Authorizer Settings', 'authorizer' ), array( $this, 'add_auth_dashboard_widget' ) );
			}
		}


		function add_auth_dashboard_widget() {
			?><form method="post" id="auth_settings_access_form" action="">
				<?php $this->print_section_info_access_login(); ?>
				<div>
					<h2><?php _e( 'Pending Users', 'authorizer' ); ?></h2>
					<?php $this->print_combo_auth_access_users_pending(); ?>
				</div>
				<div>
					<h2><?php _e( 'Approved Users', 'authorizer' ); ?></h2>
					<?php $this->print_combo_auth_access_users_approved(); ?>
				</div>
				<div>
					<h2><?php _e( 'Blocked Users', 'authorizer' ); ?></h2>
					<?php $this->print_combo_auth_access_users_blocked(); ?>
				</div>
				<br class="clear" />
			</form><?php
		}


		// Fired on a change event from the optional usermeta field in the
		// approved user list. Updates the selected usermeta value, or saves it
		// in the user's approved list entry if the user hasn't logged in yet
		// and created a WordPress account.
		function ajax_update_auth_usermeta() {
			// Fail silently if current user doesn't have permissions.
			if ( ! current_user_can( 'create_users' ) ) {
				die( '' );
			}

			// Nonce check.
			if ( empty( $_POST['nonce_save_auth_settings'] ) || ! wp_verify_nonce( $_POST['nonce_save_auth_settings'], 'save_auth_settings' ) ) {
				die( '' );
			}

			// Fail if required post data doesn't exist.
			if ( ! array_key_exists( 'email', $_REQUEST ) || ! array_key_exists( 'usermeta', $_REQUEST ) ) {
				die( '' );
			}

			// Get values to update from post data.
			$email = $_REQUEST['email'];
			$meta_value = $_REQUEST['usermeta'];
			$meta_key = $this->get_plugin_option( 'advanced_usermeta' );

			// If user doesn't exist, save usermeta selection to authorizer
			// list. This value will get saved to usermeta when the user first
			// logs in (i.e., when their WordPress account is created).
			if ( ! ( $wp_user = get_user_by( 'email', $email ) ) ) {
				// Look through multisite approved users and add a usermeta
				// reference for the current blog if the user is found.
				$auth_multisite_settings_access_users_approved = is_multisite() ? get_blog_option( BLOG_ID_CURRENT_SITE, 'auth_multisite_settings_access_users_approved', array() ) : array();
				$should_update_auth_multisite_settings_access_users_approved = false;
				foreach ( $auth_multisite_settings_access_users_approved as $index => $approved_user ) {
					if ( $email === $approved_user['email'] ) {
						if ( ! is_array( $auth_multisite_settings_access_users_approved[$index]['usermeta'] ) ) {
							// Initialize the array of usermeta for each blog this user belongs to.
							$auth_multisite_settings_access_users_approved[$index]['usermeta'] = array();
						} else {
							// There is already usermeta associated with this
							// preapproved user; iterate through it and make
							// sure it's not for old meta_keys (delete it if
							// so). This can happen if someone changes the
							// usermeta key in authorizer options, and we don't
							// want to hang on to old data.
							foreach ( $auth_multisite_settings_access_users_approved[$index]['usermeta'] as $blog_id => $usermeta ) {
								if ( array_key_exists( 'meta_key', $usermeta ) && $usermeta['meta_key'] === $meta_key ) {
									continue;
								} else {
									unset( $auth_multisite_settings_access_users_approved[$index]['usermeta'][$blog_id] );
								}
							}
						}
						$auth_multisite_settings_access_users_approved[$index]['usermeta'][get_current_blog_id()] = array(
							'meta_key' => $meta_key,
							'meta_value' => $meta_value,
						);
						$should_update_auth_multisite_settings_access_users_approved = true;
					}
				}
				if ( $should_update_auth_multisite_settings_access_users_approved ) {
					update_blog_option( BLOG_ID_CURRENT_SITE, 'auth_multisite_settings_access_users_approved', $auth_multisite_settings_access_users_approved );
				}

				// Look through the approved users (of the current blog in a
				// multisite install, or just of the single site) and add a
				// usermeta reference if the user is found.
				$auth_settings_access_users_approved = $this->get_plugin_option( 'access_users_approved', SINGLE_ADMIN );
				$should_update_auth_settings_access_users_approved = false;
				foreach ( $auth_settings_access_users_approved as $index => $approved_user ) {
					if ( $email === $approved_user['email'] ) {
						$auth_settings_access_users_approved[$index]['usermeta'] = array(
							'meta_key' => $meta_key,
							'meta_value' => $meta_value,
						);
						$should_update_auth_settings_access_users_approved = true;
					}
				}
				if ( $should_update_auth_settings_access_users_approved ) {
					update_option( 'auth_settings_access_users_approved', $auth_settings_access_users_approved );
				}

			} else {
				// Update user's usermeta value for usermeta key stored in authorizer options.
				if ( strpos( $meta_key, 'acf___' ) === 0 && class_exists( 'acf' ) ) {
					// We have an ACF field value, so use the ACF function to update it.
					update_field( str_replace('acf___', '', $meta_key ), $meta_value, 'user_' . $wp_user->ID );
				} else {
					// We have a normal usermeta value, so just update it via the WordPress function.
					update_user_meta( $wp_user->ID, $meta_key, $meta_value );
				}

			}

			// Return 'success' value to AJAX call.
			die( 'success' );
		}


		function ajax_update_auth_user() {
			// Fail silently if current user doesn't have permissions.
			if ( ! current_user_can( 'create_users' ) ) {
				die( '' );
			}

			// Nonce check.
			if ( empty( $_POST['nonce_save_auth_settings'] ) || ! wp_verify_nonce( $_POST['nonce_save_auth_settings'], 'save_auth_settings' ) ) {
				die( '' );
			}

			// Fail if requesting a change to an invalid setting.
			if ( ! in_array( $_POST['setting'], array( 'access_users_pending', 'access_users_approved', 'access_users_blocked' ) ) ) {
				die( '' );
			}

			// Editing a pending list entry.
			if ( $_POST['setting'] === 'access_users_pending' ) {
				// Initialize posted data if empty.
				if ( ! ( array_key_exists( 'access_users_pending', $_POST ) && is_array( $_POST['access_users_pending'] ) ) ) {
					$_POST['access_users_pending'] = array();
				}

				// Deal with each modified user (add or remove).
				foreach ( $_POST['access_users_pending'] as $pending_user ) {

					if ( $pending_user['edit_action'] === 'add' ) {

						// Add new user to pending list and save (skip if it's
						// already there--someone else might have just done it).
						if ( ! $this->is_email_in_list( $pending_user['email'], 'pending' ) ) {
							$auth_settings_access_users_pending = $this->sanitize_user_list(
								$this->get_plugin_option( 'access_users_pending', SINGLE_ADMIN )
							);
							array_push( $auth_settings_access_users_pending, $pending_user );
							update_option( 'auth_settings_access_users_pending', $auth_settings_access_users_pending );
						}

					} elseif ( $pending_user['edit_action'] === 'remove' ) {

						// Remove user from pending list and save
						if ( $this->is_email_in_list( $pending_user['email'], 'pending' ) ) {
							$auth_settings_access_users_pending = $this->sanitize_user_list(
								$this->get_plugin_option( 'access_users_pending', SINGLE_ADMIN )
							);
							foreach ( $auth_settings_access_users_pending as $key => $existing_user ) {
								if ( $pending_user['email'] == $existing_user['email'] ) {
									unset( $auth_settings_access_users_pending[$key] );
									break;
								}
							}
							update_option( 'auth_settings_access_users_pending', $auth_settings_access_users_pending );
						}

					}
				}
			}

			// Editing an approved list entry.
			if ( $_POST['setting'] === 'access_users_approved' ) {
				// Initialize posted data if empty.
				if ( ! ( array_key_exists( 'access_users_approved', $_POST ) && is_array( $_POST['access_users_approved'] ) ) ) {
					$_POST['access_users_approved'] = array();
				}

				// Deal with each modified user (add, remove, or change_role).
				foreach ( $_POST['access_users_approved'] as $approved_user ) {

					// New user (create user, or add existing user to current site in multisite).
					if ( $approved_user['edit_action'] === 'add' ) {
						$new_user = get_user_by( 'email', $approved_user['email'] );
						if ( $new_user !== false ) {
							// If this user already has an account on another site in the network, add them to this site.
							if ( is_multisite() ) {
								add_user_to_blog( get_current_blog_id(), $new_user->ID, $approved_user['role'] );
							}
						} elseif ( $approved_user['local_user'] === 'true' ) {
							// Create a WP account for this new *local* user and email the password.
							$plaintext_password = wp_generate_password(); // random password
							// If there's already a user with this username (e.g.,
							// johndoe/johndoe@gmail.com exists, and we're trying to add
							// johndoe/johndoe@example.com), use the full email address
							// as the username.
							$username = explode( '@', $approved_user['email'] );
							$username = $username[0];
							if ( get_user_by( 'login', $username ) !== false ) {
								$username = $approved_user['email'];
							}
							if ( $approved_user['multisite_user'] !== 'false' ) {
								$result = wpmu_create_user(
									strtolower( $username ),
									$plaintext_password,
									strtolower( $approved_user['email'] )
								);
							} else {
								$result = wp_insert_user(
									array(
										'user_login' => strtolower( $username ),
										'user_pass' => $plaintext_password,
										'first_name' => '',
										'last_name' => '',
										'user_email' => strtolower( $approved_user['email'] ),
										'user_registered' => date( 'Y-m-d H:i:s' ),
										'role' => $approved_user['role'],
									)
								);
							}
							if ( ! is_wp_error( $result ) ) {
								// Email login credentials to new user.
								wp_new_user_notification( $result, null, 'both' );
							}

						}

						// Email new user welcome message if plugin option is set.
						$this->maybe_email_welcome_message( $approved_user['email'] );

						// Add new user to approved list and save (skip if it's
						// already there--someone else might have just done it).
						if ( $approved_user['multisite_user'] !== 'false' ) {
							if ( ! $this->is_email_in_list( $approved_user['email'], 'approved', 'multisite' ) ) {
								$auth_multisite_settings_access_users_approved = $this->sanitize_user_list(
									$this->get_plugin_option( 'access_users_approved', MULTISITE_ADMIN )
								);
								$approved_user['date_added'] = date( 'M Y' );
								array_push( $auth_multisite_settings_access_users_approved, $approved_user );
								update_blog_option( BLOG_ID_CURRENT_SITE, 'auth_multisite_settings_access_users_approved', $auth_multisite_settings_access_users_approved );
							}
						} else {
							if ( ! $this->is_email_in_list( $approved_user['email'], 'approved' ) ) {
								$auth_settings_access_users_approved = $this->sanitize_user_list(
									$this->get_plugin_option( 'access_users_approved', SINGLE_ADMIN )
								);
								$approved_user['date_added'] = date( 'M Y' );
								array_push( $auth_settings_access_users_approved, $approved_user );
								update_option( 'auth_settings_access_users_approved', $auth_settings_access_users_approved );
							}
						}

						// If we've added a new multisite user, go through all pending/approved/blocked lists
						// on individual sites and remove this user from them (to prevent duplicate entries).
						if ( $approved_user['multisite_user'] !== 'false' && is_multisite() ) {
							$list_names = array( 'access_users_pending', 'access_users_approved', 'access_users_blocked' );
							$sites = function_exists( 'get_sites' ) ? get_sites() : wp_get_sites( array( 'limit' => 999999 ) );
							foreach ( $sites as $site ) {
								$blog_id = function_exists( 'get_sites' ) ? $site->blog_id : $site['blog_id'];
								foreach ( $list_names as $list_name ) {
									$user_list = get_blog_option( $blog_id, 'auth_settings_' . $list_name, array() );
									$list_changed = false;
									foreach ( $user_list as $key => $user ) {
										if ( $user['email'] == $approved_user['email'] ) {
											unset( $user_list[$key] );
											$list_changed = true;
										}
									}
									if ( $list_changed ) {
										update_blog_option( $blog_id, 'auth_settings_' . $list_name, $user_list );
									}
								}
							}
						}

					// Remove user from approved list and save
					} elseif ( $approved_user['edit_action'] === 'remove' ) {
						if ( $approved_user['multisite_user'] !== 'false' ) {
							if ( $this->is_email_in_list( $approved_user['email'], 'approved', 'multisite' ) ) {
								$auth_multisite_settings_access_users_approved = $this->sanitize_user_list(
									$this->get_plugin_option( 'access_users_approved', MULTISITE_ADMIN )
								);
								foreach ( $auth_multisite_settings_access_users_approved as $key => $existing_user ) {
									if ( $approved_user['email'] == $existing_user['email'] ) {
										unset( $auth_multisite_settings_access_users_approved[$key] );
										break;
									}
								}
								update_blog_option( BLOG_ID_CURRENT_SITE, 'auth_multisite_settings_access_users_approved', $auth_multisite_settings_access_users_approved );
							}
						} else {
							if ( $this->is_email_in_list( $approved_user['email'], 'approved' ) ) {
								$auth_settings_access_users_approved = $this->sanitize_user_list(
									$this->get_plugin_option( 'access_users_approved', SINGLE_ADMIN )
								);
								foreach ( $auth_settings_access_users_approved as $key => $existing_user ) {
									if ( $approved_user['email'] == $existing_user['email'] ) {
										unset( $auth_settings_access_users_approved[$key] );
										break;
									}
								}
								update_option( 'auth_settings_access_users_approved', $auth_settings_access_users_approved );
							}
						}

					//  Update user's role in WordPress
					} elseif ( $approved_user['edit_action'] === 'change_role' ) {
						$changed_user = get_user_by( 'email', $approved_user['email'] );
						if ( $changed_user ) {
							if ( is_multisite() && $approved_user['multisite_user'] !== 'false' ) {
								foreach ( get_blogs_of_user( $changed_user->ID ) as $blog ) {
									add_user_to_blog( $blog->userblog_id, $changed_user->ID, $approved_user['role'] );
								}
							} else {
								$changed_user->set_role( $approved_user['role'] );
							}
						}

						if ( $approved_user['multisite_user'] !== 'false' ) {
							if ( $this->is_email_in_list( $approved_user['email'], 'approved', 'multisite' ) ) {
								$auth_multisite_settings_access_users_approved = $this->sanitize_user_list(
									$this->get_plugin_option( 'access_users_approved', MULTISITE_ADMIN )
								);
								foreach ( $auth_multisite_settings_access_users_approved as $key => $existing_user ) {
									if ( $approved_user['email'] == $existing_user['email'] ) {
										$auth_multisite_settings_access_users_approved[$key]['role'] = $approved_user['role'];
										break;
									}
								}
								update_blog_option( BLOG_ID_CURRENT_SITE, 'auth_multisite_settings_access_users_approved', $auth_multisite_settings_access_users_approved );
							}
						} else {
							// Update user's role in approved list and save.
							if ( $this->is_email_in_list( $approved_user['email'], 'approved' ) ) {
								$auth_settings_access_users_approved = $this->sanitize_user_list(
									$this->get_plugin_option( 'access_users_approved', SINGLE_ADMIN )
								);
								foreach ( $auth_settings_access_users_approved as $key => $existing_user ) {
									if ( $approved_user['email'] == $existing_user['email'] ) {
										$auth_settings_access_users_approved[$key]['role'] = $approved_user['role'];
										break;
									}
								}
								update_option( 'auth_settings_access_users_approved', $auth_settings_access_users_approved );
							}
						}

					}
				}
			}

			// Editing a blocked list entry.
			if ( $_POST['setting'] === 'access_users_blocked' ) {
				// Initialize posted data if empty.
				if ( ! ( array_key_exists( 'access_users_blocked', $_POST ) && is_array( $_POST['access_users_blocked'] ) ) ) {
					$_POST['access_users_blocked'] = array();
				}

				// Deal with each modified user (add or remove).
				foreach ( $_POST['access_users_blocked'] as $blocked_user ) {

					if ( $blocked_user['edit_action'] === 'add' ) {

						// Add auth_blocked usermeta for the user.
						$blocked_wp_user = get_user_by( 'email', $blocked_user['email'] );
						if ( $blocked_wp_user !== false ) {
							update_user_meta( $blocked_wp_user->ID, 'auth_blocked', 'yes' );
						}

						// Add new user to blocked list and save (skip if it's
						// already there--someone else might have just done it).
						if ( ! $this->is_email_in_list( $blocked_user['email'], 'blocked' ) ) {
							$auth_settings_access_users_blocked = $this->sanitize_user_list(
								$this->get_plugin_option( 'access_users_blocked', SINGLE_ADMIN )
							);
							$blocked_user['date_added'] = date( 'M Y' );
							array_push( $auth_settings_access_users_blocked, $blocked_user );
							update_option( 'auth_settings_access_users_blocked', $auth_settings_access_users_blocked );
						}

					} elseif ( $blocked_user['edit_action'] === 'remove' ) {

						// Remove auth_blocked usermeta for the user.
						$unblocked_user = get_user_by( 'email', $blocked_user['email'] );
						if ( $unblocked_user !== false ) {
							delete_user_meta( $unblocked_user->ID, 'auth_blocked', 'yes' );
						}

						// Remove user from blocked list and save
						if ( $this->is_email_in_list( $blocked_user['email'], 'blocked' ) ) {
							$auth_settings_access_users_blocked = $this->sanitize_user_list(
								$this->get_plugin_option( 'access_users_blocked', SINGLE_ADMIN )
							);
							foreach ( $auth_settings_access_users_blocked as $key => $existing_user ) {
								if ( $blocked_user['email'] == $existing_user['email'] ) {
									unset( $auth_settings_access_users_blocked[$key] );
									break;
								}
							}
							update_option( 'auth_settings_access_users_blocked', $auth_settings_access_users_blocked );
						}

					}
				}
			}

			// Return 'success' value to AJAX call.
			die( 'success' );
		}



		/**
		 * ***************************
		 * Helper functions
		 * ***************************
		 */


		/**
		 * Retrieves a specific plugin option from db. Multisite enabled.
		 *
		 * @param string  $option        Option name
		 * @param string  $admin_mode    MULTISITE_ADMIN will retrieve the multisite value
		 * @param string  $override_mode 'allow override' will retrieve the multisite value if it exists
		 * @param string  $print_mode    'print overlay' will output overlay that hides this option on the settings page
		 * @return mixed                 Option value, or null on failure
		 */
		private function get_plugin_option( $option, $admin_mode = SINGLE_ADMIN, $override_mode = 'no override', $print_mode = 'no overlay' ) {
			// Special case for user lists (they are saved seperately to prevent concurrency issues).
			if ( in_array( $option, array( 'access_users_pending', 'access_users_approved', 'access_users_blocked' ) ) ) {
				$list = $admin_mode === MULTISITE_ADMIN ? array() : get_option( 'auth_settings_' . $option );
				if ( is_multisite() && $admin_mode === MULTISITE_ADMIN ) {
					$list = get_blog_option( BLOG_ID_CURRENT_SITE, 'auth_multisite_settings_' . $option, array() );
				}
				return $list;
			}

			// Get all plugin options.
			$auth_settings = $this->get_plugin_options( $admin_mode, $override_mode );

			// Set option to null if it wasn't found.
			if ( ! array_key_exists( $option, $auth_settings ) ) {
				return null;
			}

			// If requested and appropriate, print the overlay hiding the
			// single site option that is overridden by a multisite option.
			if (
				$admin_mode !== MULTISITE_ADMIN &&
				$override_mode === 'allow override' &&
				$print_mode === 'print overlay' &&
				array_key_exists( 'multisite_override', $auth_settings ) &&
				$auth_settings['multisite_override'] === '1' &&
				( ! array_key_exists( 'advanced_override_multisite', $auth_settings ) || $auth_settings['advanced_override_multisite'] != '1' )
			) {
				// Get original plugin options (not overridden value). We'll
				// show this old value behind the disabled overlay.
				$auth_settings = $this->get_plugin_options( $admin_mode, 'no override' );

				$name = "auth_settings[$option]";
				$id = "auth_settings_$option"; ?>
				<div id="overlay-hide-auth_settings_<?php echo $option; ?>" class="auth_multisite_override_overlay">
					<span class="overlay-note">
						<?php _e( 'This setting is overridden by a', 'authorizer' ); ?> <a href="<?php echo network_admin_url( 'admin.php?page=authorizer&tab=external' ); ?>"><?php _e( 'multisite option', 'authorizer' ); ?></a>.
					</span>
				</div>
				<?php
			}

			// If we're getting an option in a site that has overridden the multisite override, make
			// sure we are returning the option value from that site (not the multisite value).
			if ( array_key_exists( 'advanced_override_multisite', $auth_settings ) && $auth_settings['advanced_override_multisite'] == '1' ) {
				$auth_settings = $this->get_plugin_options( $admin_mode, 'no override' );
			}

			// Set option to null if it wasn't found.
			if ( ! array_key_exists( $option, $auth_settings ) ) {
				return null;
			}

			return $auth_settings[$option];
		}

		/**
		 * Retrieves all plugin options from db. Multisite enabled.
		 *
		 * @param string  $admin_mode    MULTISITE_ADMIN will retrieve the multisite value
		 * @param string  $override_mode 'allow override' will retrieve the multisite value if it exists
		 * @return mixed                 Option value, or null on failure
		 */
		private function get_plugin_options( $admin_mode = SINGLE_ADMIN, $override_mode = 'no override' ) {
			// Grab plugin settings (skip if in MULTISITE_ADMIN mode).
			$auth_settings = $admin_mode === MULTISITE_ADMIN ? array() : get_option( 'auth_settings' );

			// Initialize to empty array if the plugin option doesn't exist.
			if ( $auth_settings === FALSE ) {
				$auth_settings = array();
			}

			// Merge multisite options if we're in a network and the current site hasn't overridden multisite settings.
			if ( is_multisite() && ( ! array_key_exists( 'advanced_override_multisite', $auth_settings ) || $auth_settings['advanced_override_multisite'] != '1' ) ) {
				// Get multisite options.
				$auth_multisite_settings = get_blog_option( BLOG_ID_CURRENT_SITE, 'auth_multisite_settings', array() );

				// Return the multisite options if we're viewing the network admin options page.
				// Otherwise override options with their multisite equivalents.
				if ( $admin_mode === MULTISITE_ADMIN ) {
					$auth_settings = $auth_multisite_settings;
				} elseif (
					$override_mode === 'allow override' &&
					array_key_exists( 'multisite_override', $auth_multisite_settings ) &&
					$auth_multisite_settings['multisite_override'] === '1'
				) {
					// Keep track of the multisite override selection.
					$auth_settings['multisite_override'] = $auth_multisite_settings['multisite_override'];

					// Note: the options below should be the complete list of
					// overridden options. It is *not* the complete list of all
					// options (some options don't have a multisite equivalent)

					// Note: access_users_approved, access_users_pending, and
					// access_users_blocked do not get overridden. However,
					// since access_users_approved has a multisite equivalent,
					// you must retrieve them both seperately. This is done
					// because the two lists should be treated differently.
					// $approved_users    = $this->get_plugin_option( 'access_users_approved', SINGLE_ADMIN );
					// $ms_approved_users = $this->get_plugin_option( 'access_users_approved', MULTISITE_ADMIN );

					// Override external services (google, cas, or ldap) and associated options
					$auth_settings['google'] = $auth_multisite_settings['google'];
					$auth_settings['google_clientid'] = $auth_multisite_settings['google_clientid'];
					$auth_settings['google_clientsecret'] = $auth_multisite_settings['google_clientsecret'];
					$auth_settings['google_hosteddomain'] = $auth_multisite_settings['google_hosteddomain'];
					$auth_settings['cas'] = $auth_multisite_settings['cas'];
					$auth_settings['cas_custom_label'] = $auth_multisite_settings['cas_custom_label'];
					$auth_settings['cas_host'] = $auth_multisite_settings['cas_host'];
					$auth_settings['cas_port'] = $auth_multisite_settings['cas_port'];
					$auth_settings['cas_path'] = $auth_multisite_settings['cas_path'];
					$auth_settings['cas_version'] = $auth_multisite_settings['cas_version'];
					$auth_settings['cas_attr_email'] = $auth_multisite_settings['cas_attr_email'];
					$auth_settings['cas_attr_first_name'] = $auth_multisite_settings['cas_attr_first_name'];
					$auth_settings['cas_attr_last_name'] = $auth_multisite_settings['cas_attr_last_name'];
					$auth_settings['cas_attr_update_on_login'] = $auth_multisite_settings['cas_attr_update_on_login'];
					$auth_settings['cas_auto_login'] = $auth_multisite_settings['cas_auto_login'];
					$auth_settings['ldap'] = $auth_multisite_settings['ldap'];
					$auth_settings['ldap_host'] = $auth_multisite_settings['ldap_host'];
					$auth_settings['ldap_port'] = $auth_multisite_settings['ldap_port'];
					$auth_settings['ldap_search_base'] = $auth_multisite_settings['ldap_search_base'];
					$auth_settings['ldap_uid'] = $auth_multisite_settings['ldap_uid'];
					$auth_settings['ldap_attr_email'] = $auth_multisite_settings['ldap_attr_email'];
					$auth_settings['ldap_user'] = $auth_multisite_settings['ldap_user'];
					$auth_settings['ldap_password'] = $auth_multisite_settings['ldap_password'];
					$auth_settings['ldap_tls'] = $auth_multisite_settings['ldap_tls'];
					$auth_settings['ldap_lostpassword_url'] = $auth_multisite_settings['ldap_lostpassword_url'];
					$auth_settings['ldap_attr_first_name'] = $auth_multisite_settings['ldap_attr_first_name'];
					$auth_settings['ldap_attr_last_name'] = $auth_multisite_settings['ldap_attr_last_name'];
					$auth_settings['ldap_attr_update_on_login'] = $auth_multisite_settings['ldap_attr_update_on_login'];

					// Override access_who_can_login and access_who_can_view
					$auth_settings['access_who_can_login'] = $auth_multisite_settings['access_who_can_login'];
					$auth_settings['access_who_can_view'] = $auth_multisite_settings['access_who_can_view'];

					// Override access_default_role
					$auth_settings['access_default_role'] = $auth_multisite_settings['access_default_role'];

					// Override lockouts
					$auth_settings['advanced_lockouts'] = $auth_multisite_settings['advanced_lockouts'];

					// Override Hide WordPress login
					$auth_settings['advanced_hide_wp_login'] = $auth_multisite_settings['advanced_hide_wp_login'];
				}
			}
			return $auth_settings;
		}


		/**
		 * Remove user from authorizer lists when that user is deleted in WordPress.
		 * Run on action hook: delete_user
		 */
		function remove_user_from_authorizer_when_deleted( $user_id ) {
			$userdata = get_userdata( $user_id );
			$deleted_email = $userdata->user_email;

			// Remove user from pending/approved lists and save.
			$list_names = array( 'access_users_pending', 'access_users_approved' );
			foreach ( $list_names as $list_name ) {
				$user_list = $this->sanitize_user_list( $this->get_plugin_option( $list_name, SINGLE_ADMIN ) );
				$list_changed = false;
				foreach ( $user_list as $key => $existing_user ) {
					if ( $deleted_email === $existing_user['email'] ) {
						$list_changed = true;
						unset( $user_list[$key] );
					}
				}
				if ( $list_changed ) {
					update_option( 'auth_settings_' . $list_name, $user_list );
				}
			}
		}


		/**
		 * Remove multisite user from authorizer lists when that user is deleted from Network Users.
		 * Run on action hook: wpmu_delete_user
		 */
		function remove_network_user_from_authorizer_when_deleted( $user_id ) {
			$userdata = get_userdata( $user_id );
			$deleted_email = $userdata->user_email;

			// Go through multisite approved user list and remove this user.
			$auth_multisite_settings_access_users_approved = $this->sanitize_user_list(
				$this->get_plugin_option( 'access_users_approved', MULTISITE_ADMIN )
			);
			$list_changed = false;
			foreach ( $auth_multisite_settings_access_users_approved as $key => $existing_user ) {
				if ( $deleted_email === $existing_user['email'] ) {
					$list_changed = true;
					unset( $auth_multisite_settings_access_users_approved[$key] );
				}
			}
			if ( $list_changed ) {
				update_blog_option( BLOG_ID_CURRENT_SITE, 'auth_multisite_settings_access_users_approved', $auth_multisite_settings_access_users_approved );
			}

			// Go through all pending/approved lists on individual sites and remove this user from them.
			$sites = function_exists( 'get_sites' ) ? get_sites() : wp_get_sites( array( 'limit' => 999999 ) );
			foreach ( $sites as $site ) {
				$blog_id = function_exists( 'get_sites' ) ? $site->blog_id : $site['blog_id'];
				$this->remove_network_user_from_site_when_removed( $user_id, $blog_id );
			}

		}


		/**
		 * Remove multisite user from a specific site's lists when that user is removed from the site.
		 * Run on action hook: remove_user_from_blog
		 */
		function remove_network_user_from_site_when_removed( $user_id, $blog_id ) {
			$userdata = get_userdata( $user_id );
			$deleted_email = $userdata->user_email;

			$list_names = array( 'access_users_pending', 'access_users_approved' );
			foreach ( $list_names as $list_name ) {
				$user_list = get_blog_option( $blog_id, 'auth_settings_' . $list_name, array() );
				$list_changed = false;
				foreach ( $user_list as $key => $existing_user ) {
					if ( $deleted_email === $existing_user['email'] ) {
						$list_changed = true;
						unset( $user_list[$key] );
					}
				}
				if ( $list_changed ) {
					update_blog_option( $blog_id, 'auth_settings_' . $list_name, $user_list );
				}
			}
		}


		/**
		 * Multisite:
		 * When an existing user is invited to the current site (or a new user is created),
		 * add them to the authorizer approved list. This action fires when the admin
		 * doesn't select the "Skip Confirmation Email" option.
		 *
		 * @action invite_user
		 *
		 * @param int $user_id The invited user's ID.
		 * @param array $role The role of the invited user (or none if a new user creation).
		 * @param string $newuser_key The key of the invitation.
		 */
		function add_existing_user_to_authorizer_when_created( $user_id, $role = array(), $newuser_key = '' ) {
			$user = get_user_by( 'id', $user_id );
			$this->add_user_to_authorizer_when_created( $user->user_email, $user->user_registered, $user->user_roles, $role );
		}


		/**
		 * Multisite:
		 * When an existing user is invited to the current site (or a new user is created),
		 * add them to the authorizer approved list. This action fires when the admin
		 * selects the "Skip Confirmation Email" option.
		 *
		 * @action added_existing_user
		 *
		 * @param int $user_id The invited user's ID.
		 * @param mixed $result True on success or a WP_Error object if the user doesn't exist.
		 */
		function add_existing_user_to_authorizer_when_created_noconfirmation( $user_id, $result ) {
			$user = get_user_by( 'id', $user_id );
			$this->add_user_to_authorizer_when_created( $user->user_email, $user->user_registered, $user->user_roles );
		}


		/**
		 * Multisite:
		 * When a new user is invited to the current site (or a new user is created),
		 * add them to the authorizer approved list.
		 *
		 * @action after_signup_user
		 *
		 * @param string $user User's requested login name.
		 * @param string $user_email User's email address.
		 * @param string $key User's activation key.
		 * @param array $meta Additional signup meta.
		 */
		function add_new_user_to_authorizer_when_created( $user, $user_email, $key, $meta ) {
			$this->add_user_to_authorizer_when_created( $user_email, time() );
		}


		/**
		 * Single site:
		 * When a new user is added in single site mode, add them to the authorizer
		 * approved list.
		 *
		 * @action edit_user_created_user
		 *
		 * @param int $user_id ID of the newly created user.
		 * @param string $notify Type of notification that should happen. See wp_send_new_user_notifications()
		 *                       for more information on possible values.
		 */
		function add_new_user_to_authorizer_when_created_single_Site( $user_id, $notify ) {
			$user = get_user_by( 'id', $user_id );
			$this->add_user_to_authorizer_when_created( $user->user_email, $user->user_registered, $user->user_roles );
		}


		/**
		 * Helper: When a new user is added/invited to the current site (or a new
		 * user is created), add them to the authorizer approved list.
		 */
		private function add_user_to_authorizer_when_created( $user_email, $date_registered, $user_roles = array(), $default_role = array() ) {
			$auth_multisite_settings_access_users_approved = is_multisite() ? get_blog_option( BLOG_ID_CURRENT_SITE, 'auth_multisite_settings_access_users_approved', array() ) : array();
			$auth_settings_access_users_pending = $this->get_plugin_option( 'access_users_pending', SINGLE_ADMIN );
			$auth_settings_access_users_approved = $this->get_plugin_option( 'access_users_approved', SINGLE_ADMIN );
			$auth_settings_access_users_blocked = $this->get_plugin_option( 'access_users_blocked', SINGLE_ADMIN );

			// Get default role if one isn't specified.
			if ( count( $default_role ) < 1 ) {
				$default_role = '';
			} else {
				$default_role = strtolower( $default_role['name'] );
			}

			$updated = false;

			// Skip if user is in blocked list.
			if ( $this->in_multi_array( $user_email, $auth_settings_access_users_blocked ) ) {
				return;
			}
			// Remove from pending list if there.
			foreach ( $auth_settings_access_users_pending as $key => $pending_user ) {
				if ( $pending_user['email'] == $user_email ) {
					unset( $auth_settings_access_users_pending[$key] );
					$updated = true;
				}
			}
			// Skip if user is in multisite approved list.
			if ( $this->in_multi_array( $user_email, $auth_multisite_settings_access_users_approved ) ) {
				return;
			}
			// Add to approved list if not there.
			if ( ! $this->in_multi_array( $user_email, $auth_settings_access_users_approved ) ) {
				$approved_user = array(
					'email' => $user_email,
					'role' => is_array( $user_roles ) && count( $user_roles ) > 0 ? $user_roles[0] : $default_role,
					'date_added' => date( 'M Y', strtotime( $date_registered ) ),
					'local_user' => true,
				);
				array_push( $auth_settings_access_users_approved, $approved_user );
				$updated = true;
			}

			if ( $updated ) {
				update_option( 'auth_settings_access_users_pending', $auth_settings_access_users_pending );
				update_option( 'auth_settings_access_users_approved', $auth_settings_access_users_approved );
			}
		}


		private function maybe_email_welcome_message( $email ) {
			// Get option for whether to email welcome messages.
			$should_email_new_approved_users = $this->get_plugin_option( 'access_should_email_approved_users' );

			// Do not send welcome email if option not enabled.
			if ( $should_email_new_approved_users !== '1' ) {
				return false;
			}

			// Make sure we didn't just email this user (can happen with
			// multiple admins saving at the same time, or by clicking
			// Approve button too rapidly).
			$recently_sent_emails = get_option( 'auth_settings_recently_sent_emails' );
			if ( $recently_sent_emails === FALSE ) {
				$recently_sent_emails = array();
			}
			foreach ( $recently_sent_emails as $key => $recently_sent_email ) {
				if ( $recently_sent_email['time'] < strtotime( 'now -1 minutes' ) ) {
					// Remove emails sent more than 1 minute ago.
					unset( $recently_sent_emails[$key] );
				} elseif ( $recently_sent_email['email'] === $email ) {
					// Sent an email to this user within the last 1 minute, so
					// quit without sending.
					return false;
				}
			}
			// Add the email we're about to send to the list.
			$recently_sent_emails[] = array(
				'email' => $email,
				'time' => time(),
			);
			update_option( 'auth_settings_recently_sent_emails', $recently_sent_emails );

			// Get welcome email subject and body text
			$subject = $this->get_plugin_option( 'access_email_approved_users_subject' );
			$body = apply_filters( 'the_content', $this->get_plugin_option( 'access_email_approved_users_body' ) );

			// Fail if the subject/body options don't exist or are empty.
			if ( is_null( $subject ) || is_null( $body ) || strlen( $subject ) === 0 || strlen( $body ) === 0 ) {
				return false;
			}

			// Replace approved shortcode patterns in subject and body.
			$site_name = get_bloginfo( 'name' );
			$site_url = get_site_url();
			$subject = str_replace( '[site_name]', $site_name, $subject );
			$body = str_replace( '[site_name]', $site_name, $body );
			$body = str_replace( '[site_url]', $site_url, $body );
			$body = str_replace( '[user_email]', $email, $body );
			$headers = 'Content-type: text/html' . "\r\n";

			// Send email.
			wp_mail( $email, $subject, $body, $headers );

			// Indicate mail was sent.
			return true;
		}


		/**
		 * Generate a unique cookie to add to nonces to prevent CSRF.
		 */
		protected $cookie_value = null;
		function get_cookie_value() {
			if ( ! $this->cookie_value ) {
				if ( isset( $_COOKIE['login_unique'] ) ) {
					$this->cookie_value = $_COOKIE['login_unique'];
				} else {
					$this->cookie_value = md5( rand() );
				}
			}
			return $this->cookie_value;
		}


		/**
		 * Basic encryption using a public (not secret!) key. Used for general
		 * database obfuscation of passwords.
		 */
		private static $key = "8QxnrvjdtweisvCBKEY!+0\0\0";
		function encrypt( $text ) {
			$result = '';

			// Use mcrypt library (better) if php5-mcrypt extension is enabled.
			if ( function_exists( 'mcrypt_encrypt' ) ) {
				$result = mcrypt_encrypt( MCRYPT_RIJNDAEL_256, self::$key, $text, MCRYPT_MODE_ECB, 'abcdefghijklmnopqrstuvwxyz012345' );
			} else {
				for ( $i = 0; $i < strlen( $text ); $i++ ) {
					$char = substr( $text, $i, 1 );
					$keychar = substr( self::$key, ( $i % strlen( self::$key ) ) - 1, 1 );
					$char = chr( ord( $char ) + ord( $keychar ) );
					$result .= $char;
				}
				$result = base64_encode( $result );
			}

			return $result;
		}


		function decrypt( $secret ) {
			$result = '';

			// Use mcrypt library (better) if php5-mcrypt extension is enabled.
			if ( function_exists( 'mcrypt_decrypt' ) ) {
				$result = rtrim( mcrypt_decrypt( MCRYPT_RIJNDAEL_256, self::$key, $secret, MCRYPT_MODE_ECB, 'abcdefghijklmnopqrstuvwxyz012345' ), "\0$result" );
			} else {
				$secret = base64_decode( $secret );
				for ( $i = 0; $i < strlen( $secret ); $i++ ) {
					$char = substr( $secret, $i, 1 );
					$keychar = substr( self::$key, ( $i % strlen( self::$key ) ) - 1, 1 );
					$char = chr( ord( $char ) - ord( $keychar ) );
					$result .= $char;
				}
			}

			return $result;
		}


		/**
		 * In a multisite environment, returns true if the current user is logged
		 * in and a user of the current blog. In single site mode, simply returns
		 * true if the current user is logged in.
		 */
		function is_user_logged_in_and_blog_user() {
			$is_user_logged_in_and_blog_user = false;
			if ( is_multisite() ) {
				$is_user_logged_in_and_blog_user = is_user_logged_in() && is_user_member_of_blog( get_current_user_id() );
			} else {
				$is_user_logged_in_and_blog_user = is_user_logged_in();
			}
			return $is_user_logged_in_and_blog_user;
		}


		/**
		 * Helper function to determine whether a given email is in one of
		 * the lists (pending, approved, blocked). Defaults to the list of
		 * approved users.
		 */
		function is_email_in_list( $email = '', $list = 'approved', $multisite_mode = 'single' ) {
			if ( empty( $email ) )
				return false;

			switch ( $list ) {
			case 'pending':
				$auth_settings_access_users_pending = $this->get_plugin_option( 'access_users_pending', SINGLE_ADMIN );
				return $this->in_multi_array( $email, $auth_settings_access_users_pending );
				break;
			case 'blocked':
				$auth_settings_access_users_blocked = $this->get_plugin_option( 'access_users_blocked', SINGLE_ADMIN );
				return $this->in_multi_array( $email, $auth_settings_access_users_blocked );
				break;
			case 'approved':
			default:
				if ( $multisite_mode !== 'single' ) {
					// Get multisite users only.
					$auth_settings_access_users_approved = $this->get_plugin_option( 'access_users_approved', MULTISITE_ADMIN );
				} elseif ( is_multisite() && $this->get_plugin_option( 'advanced_override_multisite' ) == '1' ) {
					// This site has overridden any multisite settings, so only get its users.
					$auth_settings_access_users_approved = $this->get_plugin_option( 'access_users_approved', SINGLE_ADMIN );
				} else {
					// Get all site users and all multisite users.
					$auth_settings_access_users_approved = array_merge(
						$this->get_plugin_option( 'access_users_approved', SINGLE_ADMIN ),
						$this->get_plugin_option( 'access_users_approved', MULTISITE_ADMIN )
					);
				}
				return $this->in_multi_array( $email, $auth_settings_access_users_approved );
				break;
			}
		}


		/**
		 * Helper function to get number of users (including multisite users)
		 * in a given list (pending, approved, or blocked).
		 *   @param string $list
		 *   @param string $admin_mode SINGLE_ADMIN or MULTISITE_ADMIN determines whether to include multisite users
		 *   @return int number of users in list
		 */
		function get_user_count_from_list( $list, $admin_mode = SINGLE_ADMIN ) {
			$auth_settings_access_users = array();

			switch ( $list ) {
			case 'pending':
				$auth_settings_access_users = $this->get_plugin_option( 'access_users_pending', SINGLE_ADMIN );
				break;
			case 'blocked':
				$auth_settings_access_users = $this->get_plugin_option( 'access_users_blocked', SINGLE_ADMIN );
				break;
			case 'approved':
				if ( $admin_mode !== SINGLE_ADMIN ) {
					// Get multisite users only.
					$auth_settings_access_users = $this->get_plugin_option( 'access_users_approved', MULTISITE_ADMIN );
				} elseif ( is_multisite() && $this->get_plugin_option( 'advanced_override_multisite' ) == '1' ) {
					// This site has overridden any multisite settings, so only get its users.
					$auth_settings_access_users = $this->get_plugin_option( 'access_users_approved', SINGLE_ADMIN );
				} else {
					// Get all site users and all multisite users.
					$auth_settings_access_users = array_merge(
						$this->get_plugin_option( 'access_users_approved', SINGLE_ADMIN ),
						$this->get_plugin_option( 'access_users_approved', MULTISITE_ADMIN )
					);
				}
			}

			return count( $auth_settings_access_users );
		}


		/**
		 * Helper function to search a multidimensional array for a value.
		 */
		function in_multi_array( $needle = '', $haystack = array(), $strict_mode = 'not strict', $case_sensitivity = 'case insensitive' ) {
			if ( ! is_array( $haystack ) ) {
				return false;
			}
			if ( $case_sensitivity === 'case insensitive' ) {
				$needle = strtolower( $needle );
			}
			foreach ( $haystack as $item ) {
				if ( $case_sensitivity === 'case insensitive' && ! is_array( $item ) ) {
					$item = strtolower( $item );
				}
				if ( ( $strict_mode === 'strict' ? $item === $needle : $item == $needle ) || ( is_array( $item ) && $this->in_multi_array( $needle, $item, $strict_mode, $case_sensitivity ) ) ) {
					return true;
				}
			}
			return false;
		}


		/**
		 * Helper function to get a WordPress page ID from the pagename.
		 *
		 * @param string  $pagename Page Slug
		 * @return int            Page/Post ID
		 */
		function get_id_from_pagename( $pagename = '' ) {
			global $wpdb;
			$page_id = $wpdb->get_var( "SELECT ID FROM $wpdb->posts WHERE post_name = '" . sanitize_title_for_query( $pagename ) . "'" );
			return $page_id;
		}


		/**
		 * Helper function to determine if an URL is accessible.
		 *
		 * @param string  $url URL that should be publicly reachable
		 * @return boolean     Whether the URL is publicly reachable
		 */
		function url_is_accessible( $url ) {
			// Make sure php5-curl extension is installed on server.
			if ( ! function_exists( 'curl_init' ) ) {
				// Note: This will silently fail, saying url is not accessible.
				// Warn user elsewhere that they should install curl.
				return false;
			}

			// Use curl to retrieve the URL.
			$handle = curl_init( $url );
			$cacert_path = plugin_dir_path( __FILE__ ) . 'inc/cacert.pem';
			curl_setopt( $handle, CURLOPT_CAINFO, $cacert_path );
			curl_setopt( $handle, CURLOPT_RETURNTRANSFER, TRUE );
			curl_setopt( $handle, CURLOPT_SSL_VERIFYPEER, FALSE );
			curl_setopt( $handle, CURLOPT_CONNECTTIMEOUT, 5 );
			$response = curl_exec( $handle );
			$http_code = curl_getinfo( $handle, CURLINFO_HTTP_CODE );
			curl_close( $handle );

			// Return true if the document has loaded successfully without any redirection or error
			return $http_code >= 200 && $http_code < 400;
		}


		// Helper function that builds option tags for a select element for all
		// roles the current user has permission to assign.
		function wp_dropdown_permitted_roles( $selected_role = 'subscriber', $disable_input = 'not disabled' ) {
			$roles = get_editable_roles();
			$current_user = wp_get_current_user();

			// If the currently selected role is not in the list of roles, it
			// either doesn't exist or the current user is not permitted to
			// assign it.
			if ( strlen( $selected_role ) > 0 && ! array_key_exists( $selected_role, $roles ) ) {
				?><option value="<?php echo $selected_role; ?>"><?php echo ucfirst( $selected_role ); ?></option><?php

				// If the role exists, that means the user isn't permitted to
				// assign it, so assume they can't edit that user's role at
				// all. Return only the one role for the dropdown list.
				if ( ! is_null( get_role( $selected_role ) ) ) {
					return;
				}
			}

			// Print an option element for each permitted role.
			foreach ( $roles as $name => $role ) {
				$selected = $selected_role === $name ? ' selected="selected"' : '';

				// Don't let a user change their own role
				$disabled = $selected_role !== $name && $disable_input === 'disabled' ? ' disabled="disabled"' : '';

				// But network admins can always change their role.
				if ( is_multisite() && current_user_can( 'manage_network' ) ) {
					$disabled = '';
				}

				?><option value="<?php echo $name; ?>"<?php echo $selected . $disabled; ?>><?php echo $role['name']; ?></option><?php
			}

			// Print default role (no role).
			$selected = $selected_role === '' ? ' selected="selected"' : '';
			$disabled = $selected_role !== '' && $disable_input === 'disabled' ? ' disabled="disabled"' : '';
			if ( is_multisite() && current_user_can( 'manage_network' ) ) {
				$disabled = '';
			}
			?><option value=""<?php echo $selected . $disabled; ?>><?php _e( '&mdash; No role for this site &mdash;', 'authorizer' ); ?></option><?php

		}


		// Helper function to get a single user info array from one of the
		// access control lists (pending, approved, or blocked).
		// Returns: false if not found; otherwise
		//  array( 'email' => '', 'role' => '', 'date_added' => '', ['usermeta' => [''|array()]] );
		function get_user_info_from_list( $email, $list ) {
			foreach ( $list as $user_info ) {
				if ( $user_info['email'] === $email ) {
					return $user_info;
				}
			}
			return false;
		}


		// Helper function to convert seconds to human readable text.
		// Source: http://csl.name/php-secs-to-human-text/
		function seconds_as_sentence( $secs ) {
			$units = array(
				"week"   => 7 * 24 * 3600,
				"day"    =>     24 * 3600,
				"hour"   =>          3600,
				"minute" =>            60,
				"second" =>             1,
			);

			// specifically handle zero
			if ( $secs == 0 ) return "0 seconds";

			$s = "";

			foreach ( $units as $name => $divisor ) {
				if ( $quot = intval( $secs / $divisor ) ) {
					$s .= "$quot $name";
					$s .= ( abs( $quot ) > 1 ? "s" : "" ) . ", ";
					$secs -= $quot * $divisor;
				}
			}

			return substr( $s, 0, -2 );
		}

		// Helper function to get all available usermeta keys as an array.
		function get_all_usermeta_keys() {
			global $wpdb;
			$usermeta_keys = $wpdb->get_col( "SELECT DISTINCT $wpdb->usermeta.meta_key FROM $wpdb->usermeta" );
			return $usermeta_keys;
		}


		/**
		 * Load translated strings from *.mo files in /languages.
		 */
		function load_textdomain() {
			load_plugin_textdomain(
				'authorizer',
				false,
				plugin_basename( dirname( __FILE__ ) ) . '/languages'
			);
		}


		/**
		 * Generate CAS authentication URL (wp-login.php URL with reauth=1 removed
		 * and external=cas added).
		 */
		function modify_current_url_for_cas_login() {
			// Construct the URL of the current page (wp-login.php).
			$url = 'http' . ( isset( $_SERVER['HTTPS'] ) ? 's' : '' ) . '://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];

			// Parse the URL into its components.
			$parsed_url = parse_url( $url );

			// Fix up the querystring values (remove reauth, make sure external=cas).
			$querystring = array();
			if ( array_key_exists( 'query', $parsed_url ) ) {
				parse_str( $parsed_url['query'], $querystring );
			}
			unset( $querystring['reauth'] );
			$querystring['external'] = 'cas';
			$parsed_url['query'] = http_build_query( $querystring );

			// Return the URL as a string.
			return $this->unparse_url( $parsed_url );
		}


		/**
		 * Reconstruct a URL after it has been deconstructed with parse_url().
		 * @param $parsed_url array() with keys from parse_url().
		 * @return string URL constructed from the components in $parsed_url.
		 */
		function unparse_url( $parsed_url = array() ) {
			$scheme = isset( $parsed_url['scheme'] ) ? $parsed_url['scheme'] . '://' : '';
			$host = isset( $parsed_url['host'] ) ? $parsed_url['host'] : '';
			$port = isset( $parsed_url['port'] ) ? ':' . $parsed_url['port'] : '';
			$user = isset( $parsed_url['user'] ) ? $parsed_url['user'] : '';
			$pass = isset( $parsed_url['pass'] ) ? ':' . $parsed_url['pass']  : '';
			$pass = $user || $pass ? "$pass@" : '';
			$path = isset( $parsed_url['path'] ) ? $parsed_url['path'] : '';
			$query = isset( $parsed_url['query'] ) ? '?' . $parsed_url['query'] : '';
			$fragment = isset( $parsed_url['fragment'] ) ? '#' . $parsed_url['fragment'] : '';
			return "$scheme$user$pass$host$port$path$query$fragment";
		}


		/**
		 * Plugin Update Routines.
		 */
		function auth_update_check() {
			// Update: Set default values for newly added options (forgot to do
			// this, so some users are getting debug log notices about undefined
			// indexes in $auth_settings).
			$update_if_older_than = 20160831;
			$auth_version = get_option( 'auth_version' );
			if ( $auth_version === false || intval( $auth_version ) < $update_if_older_than ) {
				// Provide default values for any $auth_settings options that don't exist.
				if ( is_multisite() ) {
					global $wpdb;
					$old_blog = $wpdb->blogid;
					// Get all blog ids
					$sites = function_exists( 'get_sites' ) ? get_sites() : wp_get_sites( array( 'limit' => 999999 ) );
					foreach ( $sites as $site ) {
						$blog_id = function_exists( 'get_sites' ) ? $site->blog_id : $site['blog_id'];
						switch_to_blog( $blog_id );
						// Set meaningful defaults for other sites in the network.
						$this->set_default_options();
					}
					switch_to_blog( $old_blog );
				} else {
					// Set meaningful defaults for this site.
					$this->set_default_options();
				}
				// Update version to reflect this change has been made.
				update_option( 'auth_version', $update_if_older_than );
			}

			// Update: migrate user lists to own options (addresses concurrency
			// when saving plugin options, since user lists are changed often
			// and we don't want to overwrite changes to the lists when an
			// admin saves all of the plugin options.)
			// Note: Pending user list is changed whenever a new user tries to
			// log in; approved and blocked lists are changed whenever an admin
			// changes them from the multisite panel, the dashboard widget, or
			// the plugin options page.
			$update_if_older_than = 20140709;
			$auth_version = get_option( 'auth_version' );
			if ( $auth_version === false || intval( $auth_version ) < $update_if_older_than ) {
				// Copy single site user lists to new options (if they exist).
				$auth_settings = get_option( 'auth_settings' );
				if ( is_array( $auth_settings ) && array_key_exists( 'access_users_pending', $auth_settings ) ) {
					update_option( 'auth_settings_access_users_pending', $auth_settings['access_users_pending'] );
					unset( $auth_settings['access_users_pending'] );
					update_option( 'auth_settings', $auth_settings );
				}
				if ( is_array( $auth_settings ) && array_key_exists( 'access_users_approved', $auth_settings ) ) {
					update_option( 'auth_settings_access_users_approved', $auth_settings['access_users_approved'] );
					unset( $auth_settings['access_users_approved'] );
					update_option( 'auth_settings', $auth_settings );
				}
				if ( is_array( $auth_settings ) && array_key_exists( 'access_users_blocked', $auth_settings ) ) {
					update_option( 'auth_settings_access_users_blocked', $auth_settings['access_users_blocked'] );
					unset( $auth_settings['access_users_blocked'] );
					update_option( 'auth_settings', $auth_settings );
				}
				// Copy multisite user lists to new options (if they exist).
				if ( is_multisite() ) {
					$auth_multisite_settings = get_blog_option( BLOG_ID_CURRENT_SITE, 'auth_multisite_settings', array() );
					if ( is_array( $auth_multisite_settings ) && array_key_exists( 'access_users_pending', $auth_multisite_settings ) ) {
						update_blog_option( BLOG_ID_CURRENT_SITE, 'auth_multisite_settings_access_users_pending', $auth_multisite_settings['access_users_pending'] );
						unset( $auth_multisite_settings['access_users_pending'] );
						update_blog_option( BLOG_ID_CURRENT_SITE, 'auth_multisite_settings', $auth_multisite_settings );
					}
					if ( is_array( $auth_multisite_settings ) && array_key_exists( 'access_users_approved', $auth_multisite_settings ) ) {
						update_blog_option( BLOG_ID_CURRENT_SITE, 'auth_multisite_settings_access_users_approved', $auth_multisite_settings['access_users_approved'] );
						unset( $auth_multisite_settings['access_users_approved'] );
						update_blog_option( BLOG_ID_CURRENT_SITE, 'auth_multisite_settings', $auth_multisite_settings );
					}
					if ( is_array( $auth_multisite_settings ) && array_key_exists( 'access_users_blocked', $auth_multisite_settings ) ) {
						update_blog_option( BLOG_ID_CURRENT_SITE, 'auth_multisite_settings_access_users_blocked', $auth_multisite_settings['access_users_blocked'] );
						unset( $auth_multisite_settings['access_users_blocked'] );
						update_blog_option( BLOG_ID_CURRENT_SITE, 'auth_multisite_settings', $auth_multisite_settings );
					}
				}
				// Update version to reflect this change has been made.
				update_option( 'auth_version', $update_if_older_than );
			}

			// // Update: TEMPLATE
			// $update_if_older_than = YYYYMMDD;
			// $auth_version = get_option( 'auth_version' );
			// if ( $auth_version === false || intval( $auth_version ) < $update_if_older_than ) {
			//  UPDATE CODE HERE
			//  update_option( 'auth_version', $update_if_older_than );
			// }
		}

	}
}

// Instantiate the plugin class.
$wp_plugin_authorizer = new WP_Plugin_Authorizer();