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Custom menus (and much more) for logged in WordPress users

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members.php
PHP
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<?php
/*
Plugin Name: Gallery Members (for wpse32840)
Description: Only allow members to view one page
Author: Christopher Davis
Author URI: http://www.christopherguitar.net/
*/
 
register_activation_hook( __FILE__, 'wpse32840_activation' );
function wpse32840_activation()
{
flush_rewrite_rules();
}
 
add_action( 'init', 'wpse32840_register_post_type' );
function wpse32840_register_post_type()
{
register_post_type(
'client_gallery',
array(
'label' => __( 'Client Galleries' ), // probably needs better labels
'public' => true, // allow people to see this on the front end
'exclude_from_search' => true, // cant be brought up via a search
'show_in_nav_menus' => false, // not in nav menus (we'll do this manually)
'rewrite' => array( 'slug' => 'gallery' )
)
);
}
 
/**
* When we register a user, add a 'client_gallery' post
* If that fails, set the gallery id to 0, so we can set it later.
*/
add_action( 'user_register', 'wpse32840_capture_register' );
function wpse32840_capture_register( $user_id )
{
$userobj = get_user_by( 'id', $user_id );
$gallery_id = wp_insert_post(
array(
'post_type' => 'client_gallery',
'post_title' => sprintf( '%s gallery', $userobj->user_login )
),
true
);
if( is_wp_error( $gallery_id ) ) $gallery_id = 0;
update_user_meta( $user_id, 'wpse32840_gallery_id', absint( $gallery_id ) );
}
 
/**
* We should also be able to give users acces to gallery manually,
* so let's add some fields to the user profile page
*/
add_action( 'edit_user_profile', 'wpse32840_user_profile' );
function wpse32840_user_profile( $user )
{
$gallery_id = get_user_meta( $user->ID, 'wpse32840_gallery_id', true );
// get all of our galleries!
$galleries = get_posts(
array(
'post_type' => 'client_gallery',
'numberposts' => -1,
'post_status' => 'any'
)
);
// no galleries? bail.
if( ! $galleries ) return;
// nonce
wp_nonce_field( 'wpse32840_nonce', 'wpse32840_nonce', false );
// our fields
echo '<h3>' . __( 'Gallery' ) . '</h3>';
echo '<select name="wpse32840_gallery">';
echo '<option ' . selected( $gallery_id, 0, false ). ' value="0">No gallery</option>';
foreach( $galleries as $g )
{
echo '<option ' . selected( $gallery_id, $g->ID, false ) . ' value="' . absint( $g->ID ) . '">' . esc_html( $g->post_title ) . '</option>';
}
echo '</select>';
}
 
/**
* Save the user's gallery ID from the user edit page.
*/
add_action( 'edit_user_profile_update', 'wpse32840_save_user' );
function wpse32840_save_user( $user_id )
{
if( ! isset( $_POST['wpse32840_nonce'] ) || ! wp_verify_nonce( $_POST['wpse32840_nonce'], 'wpse32840_nonce' ) )
return;
if( ! isset( $_POST['wpse32840_gallery' ] ) )
return;
update_user_meta( $user_id, 'wpse32840_gallery_id', absint( $_POST['wpse32840_gallery'] ) );
}
 
/**
* Hook into template redirect to stop normal visitor from accessing galleries
*/
add_action( 'template_redirect', 'wpse32840_check_user' );
function wpse32840_check_user()
{
// not on a client gallery? bail
if( ! is_singular( 'client_gallery' ) ) return;
// is the is an admin?
if( current_user_can( 'manage_options' ) ) return;
// thrown non logged in users back to the home page
if( ! is_user_logged_in() )
{
wp_redirect( home_url(), 302 );
exit();
}
$user = wp_get_current_user();
$gallery_id = get_queried_object_id();
// if the user isn't an admin or isn't assigned this gallery, send them back to the home page
if( $gallery_id != get_user_meta( $user->ID, 'wpse32840_gallery_id', true ) )
{
wp_redirect( home_url(), 302 );
exit();
}
// By here, the user is authenticated, let them continue on their merry way.
}
 
/**
* Filter the nav menu so logged in users only see certain things
*/
add_filter( 'wp_nav_menu_items', 'wpse32840_filter_nav', 10, 2 );
function wpse32840_filter_nav( $items, $args )
{
/**
* you can check for theme location here via $args... check to see if this is the main nav
* in twenty eleven, we can check to see if this is the "primary" menu
* Other thigns will be different. If we're not in the primary menu, bail
*/
if( 'primary' != $args->theme_location ) return $menu;
// Not logged in? return the menu
if( ! is_user_logged_in() ) return $items;
// if this is an admin, return the menu unaltered.
if( current_user_can( 'manage_options' ) ) return $items;
// our user is logged in an not an admin, build them a new menu
// get our current user
$user = wp_get_current_user();
// get the users gallery
$gallery_id = get_user_meta( $user->ID, 'wpse32840_gallery_id', true );
$gallery = get_post( absint( $gallery_id ) );
$items = '<li class="menu-item"><a href="' . esc_url( home_url() ) . '">Home</a></li>';
$items .= '<li class="menu-item"><a href="' . esc_url( get_permalink( $gallery ) ) . '">Gallery</a></li>';
return $items;
}

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