A more granlar privacy based on member types

bp-custom.php

<?php
/**
 * BuddyPress Custom
 *
 * A more granlar privacy based on member types
 */

// Exit if accessed directly
defined( 'ABSPATH' ) || exit;

// Do not create a user on registration
define( 'BP_SIGNUPS_SKIP_USER_CREATION', true );

// Only activate Members component
function imath_restrict_default_component( $default = array() ) {
	return array_intersect_key( array(
		'members'       => 1,
	), $default );
}
add_filter( 'bp_new_install_default_components', 'imath_restrict_default_component', 10, 1 );

// Only allow register and activate actions
function imath_disable_members_directory( $bool, $component = '' ) {
	if ( 'register' != $component && 'activate' !=  $component ) {
		return false;
	}

	return $bool;
}
add_filter( 'bp_is_current_component', 'imath_disable_members_directory', 10, 2 );

// Only allow register and activate actions
function imath_disable_buddypress_front_end() {
	if ( is_buddypress() && ! bp_is_register_page() && ! bp_is_activation_page() ) {
		bp_do_404();
		return;
	}
}
add_action( 'bp_actions', 'imath_disable_buddypress_front_end', 1 );

// Exclude members directory from the list of pages
function imath_exclude_members_directory_page( $pages = array() ) {
	$pages[] = buddypress()->pages->members->id;
	return $pages;
}
add_filter( 'bp_core_exclude_pages', 'imath_exclude_members_directory_page', 10, 1 );

// Disallow the submit metabox if current user is not a super admin
function imath_disable_members_admin_major_metabox() {
	if ( bp_current_user_can( 'bp_moderate' ) ) {
		return;
	}

	remove_meta_box( 'submitdiv', get_current_screen(), 'side' );
}
add_action( 'bp_members_admin_user_metaboxes', 'imath_disable_members_admin_major_metabox' );

// Register some member types
function imath_register_member_types() {
	bp_register_member_type( 'lead', array(
		'labels' => array(
			'name'          => 'Lead Developers',
			'singular_name' => 'Lead Developer',
		),
	) );

	bp_register_member_type( 'core', array(
		'labels' => array(
			'name'          => 'Core Developers',
			'singular_name' => 'Core Developer',
		),
	) );
}
add_action( 'bp_init', 'imath_register_member_types' );

// Add a column for Page post type edit screen
function imath_wp_list_table_column_header( $columns = array() ) {
	$columns['restrict_mt'] = __( 'Private allowed for', 'text-domain' );

	return $columns;
}
add_filter( 'manage_pages_columns', 'imath_wp_list_table_column_header', 10, 1 );

// Add data for the member type column
function imath_wp_list_table_column_data( $column_name = '', $post_id = 0 ) {
	if ( 'restrict_mt' !== $column_name ) {
		return;
	}

	$status = get_post_status( $post_id );

	$output = '&#8212;';

	if ( 'private' !== $status ) {
		echo $output;
	} else {
		$member_type_name = get_post_meta( $post_id, '_page_allowed_member_type', true );

		if ( empty( $member_type_name ) ) {
			echo $output;
			return;
		}

		$member_type_object = bp_get_member_type_object( $member_type_name );
		
		if ( empty( $member_type_object ) ) {
			echo $output;
		} else {
			echo esc_html( $member_type_object->labels['name'] );
		}
	}
}
add_action( 'manage_pages_custom_column', 'imath_wp_list_table_column_data', 10, 2 );

// Map capabilities to member type if needed
function imath_map_cap_to_member_type( $caps = array(), $cap = '', $user_id = 0, $args = array() ) {
	if ( empty( $user_id ) ) {
		return $caps;
	}

	$is_private_page_caps = array_flip( $caps );

	if ( ! isset( $is_private_page_caps['read_private_pages'] ) || empty( $args[0] ) ) {
		return $caps;
	}

	$_page = get_post( $args[0] );

	if ( empty( $_page ) || 'page' !== $_page->post_type ) {
		return $caps;
	}

	$allowed_member_type = get_post_meta( $_page->ID, '_page_allowed_member_type', true );

	if ( ! empty( $allowed_member_type ) && $allowed_member_type === bp_get_member_type( $user_id ) ) {
		$caps = array( 'read' );
	}

	return $caps;
}
add_filter( 'map_meta_cap', 'imath_map_cap_to_member_type', 10, 4 );

// Hide private pages from menu if the current user can't access to them
function imath_get_nav_menu_items( $items = array() ) {
	foreach ( $items as $key_item => $item ) {
		if ( 'page' !== $item->object ) {
			continue;
		}

		if ( 'private' !== get_post_status( $item->object_id ) ) {
			continue;
		}

		if ( ! current_user_can( 'read_private_pages', $item->object_id ) ) {
			unset( $items[ $key_item ] );
		}
	}

	return $items;
}
add_filter( 'wp_get_nav_menu_items', 'imath_get_nav_menu_items', 10, 1 );

// Add a quick edit field for pages
function imath_quick_edit_page_member_type( $column_name = '', $post_type = '' ) {
	if ( 'restrict_mt' !== $column_name || 'page' !== $post_type ) {
		return;
	}

	$member_types = bp_get_member_types( array(), 'objects' );

	if ( empty( $member_types ) ) {
		return;
	}
	?>
	<fieldset class="inline-edit-col-right">
		<div class="inline-edit-col">
			<div class="inline-edit-group">
				<label class="alignleft">
					<span class="title"><?php _e( 'Allow private to' ); ?></span>
					<select name="_page_allowed_member_type">
						<option value=""><?php esc_html_e( '&#8212; No change &#8212;', 'text-domain' ) ;?></option>
						<?php foreach ( $member_types as $type_key => $type ) : ?>
							<option value="<?php echo esc_attr( $type_key );?>"><?php echo esc_html( $type->labels['singular_name'] ); ?></option>
						<?php endforeach ; ?>
					</select>
				</label>
			</div>
		</div>
	</fieldset>
	<?php
}
add_action( 'quick_edit_custom_box', 'imath_quick_edit_page_member_type', 10, 2 );

// Save the private page's member type
function imath_save_page_member_type( $post_ID = 0, $page = null, $update = false ) {
	if ( ! isset( $_POST['_page_allowed_member_type'] ) || empty( $page->post_status ) || 'private' !== $page->post_status ) {
		return;
	}

	$member_type = sanitize_key( $_POST['_page_allowed_member_type'] );

	if ( empty( $update ) ) {
		update_post_meta( $page->ID, '_page_allowed_member_type', $member_type );
	} else {
		if ( empty( $_POST['_page_allowed_member_type'] ) ) {
			delete_post_meta( $page->ID, '_page_allowed_member_type' );
		} else {
			update_post_meta( $page->ID, '_page_allowed_member_type', $member_type );
		}
	}
}
add_action( 'save_post_page', 'imath_save_page_member_type', 10, 3 );