<?php
/*
Plugin Name: Nav Menu Roles
Plugin URI: http://www.kathyisawesome.com/449/nav-menu-roles/
Description: Hide custom menu items based on user roles.
Version: 1.10.1
Author: Kathy Darling
Author URI: http://www.kathyisawesome.com
License: GPL-3.0
Text Domain: nav-menu-roles

Copyright 2020 Kathy Darling

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, MA02110-1301USA
*/


// Don't load directly.
if ( ! function_exists( 'is_admin' ) ) {
	header( 'Status: 403 Forbidden' );
	header( 'HTTP/1.1 403 Forbidden' );
	exit();
}


if ( ! class_exists( "Nav_Menu_Roles" ) ) :

class Nav_Menu_Roles {

	/**
	* @var Nav_Menu_Roles The single instance of the class
	* @since 1.5
	*/
	protected static $_instance = null;

	/**
	* @constant string donate url
	* @since 1.9.1
	*/
	CONST DONATE_URL = "https://www.paypal.com/fundraiser/charity/1451316";

	/**
	* @constant string version number
	* @since 1.7.0
	*/
	CONST VERSION = '1.10.1';

	/**
	* Main Nav Menu Roles Instance
	*
	* Ensures only one instance of Nav Menu Roles is loaded or can be loaded.
	*
	* @since 1.5
	* @static
	* @see Nav_Menu_Roles()
	* @return Nav_Menu_Roles - Main instance
	*/
	public static function instance() {
		if ( is_null( self::$_instance ) ) {
			self::$_instance = new self();
		}
		return self::$_instance;
	}

	/**
	* Cloning is forbidden.
	*
	* @since 1.5
	*/
	public function __clone() {
		_doing_it_wrong( __FUNCTION__, __( 'Cloning this object is forbidden.' , 'nav-menu-roles' ), '1.5' );
	}

	/**
	* Unserializing instances of this class is forbidden.
	*
	* @since 1.5
	*/
	public function __wakeup() {
		_doing_it_wrong( __FUNCTION__, __( 'Unserializing instances of this class is forbidden.' , 'nav-menu-roles' ), '1.5' );
	}

	/**
	* Nav_Menu_Roles Constructor.
	* @access public
	* @return Nav_Menu_Roles
	* @since  1.0
	*/
	public function __construct(){

		// Admin functions.
		add_action( 'admin_init', array( $this, 'admin_init' ) );

		// Load the textdomain.
		add_action( 'init', array( $this, 'load_text_domain' ) );

		// Add FAQ and Donate link to plugin.
		add_filter( 'plugin_row_meta', array( $this, 'add_action_links' ), 10, 2 );

		// Maybe switch the admin walker.
		if( ! self::is_wp_gte( '5.4' ) ) {
			add_filter( 'wp_edit_nav_menu_walker', array( $this, 'edit_nav_menu_walker' ) );
		}

		// Add new fields via hook.
		add_action( 'wp_nav_menu_item_custom_fields', array( $this, 'custom_fields' ), 10, 4 );

		// Add some JS.
		add_action( 'admin_enqueue_scripts' , array( $this, 'enqueue_scripts' ) );

		// Save the menu item meta.
		add_action( 'wp_update_nav_menu_item', array( $this, 'nav_update'), 10, 2 );

		// Add meta to menu item.
		add_filter( 'wp_setup_nav_menu_item', array( $this, 'setup_nav_item' ) );

		// Exclude items via filter instead of via custom Walker.
		if ( ! is_admin() ) {
			// Because WP_Customize_Nav_Menu_Item_Setting::filter_wp_get_nav_menu_items() runs at 10.
			add_filter( 'wp_get_nav_menu_items', array( $this, 'exclude_menu_items' ), 20 );
		}

		// Upgrade routine.
		add_action( 'plugins_loaded', array( $this, 'maybe_upgrade' ) );

	}

	/**
	* Include the custom admin walker
	*
	* @access public
	* @return void
	*/
	public function admin_init() {

		// Register Importer.
		$this->register_importer();

	}


	/**
	* Register the Importer
	* the regular Importer skips post meta for the menu items
	*
	* @access private
	* @return void
	*/
	public function register_importer(){
		// Register the new importer.
		if ( defined( 'WP_LOAD_IMPORTERS' ) ) {

			include_once( plugin_dir_path( __FILE__ ) . 'inc/class.Nav_Menu_Roles_Import.php');
			// Register the custom importer we've created.
			$roles_import = new Nav_Menu_Roles_Import();

			register_importer( 'nav_menu_roles', __( 'Nav Menu Roles', 'nav-menu-roles' ), sprintf( __( 'Import %snav menu roles%s and other menu item meta skipped by the default importer', 'nav-menu-roles' ), '<strong>', '</strong>' ), array( $roles_import, 'dispatch' ) );

		}

	}

	/**
	* Make Plugin Translation-ready
	* 
	* @since 1.0
	*/
	public function load_text_domain() {
		load_plugin_textdomain( 'nav-menu-roles', false, dirname( plugin_basename( __FILE__ ) ) . '/languages/' );
	}


	/**
	* Display a Notice if plugin conflicts with another
	* 
	* @since 1.5
	* @deprecated will removed in 2.0
	*/
	public function admin_notice() {
		_deprecated_function( __METHOD__, '1.7.8' );
	}


	/**
	* Allow the notice to be dismissable
	* 
	* @since 1.6
	* @deprecated will removed in 2.0
	*/
	public function nag_ignore() {
		_deprecated_function( __METHOD__, '1.7.8' );
	}

	/**
	* Delete the transient when a plugin is activated or deactivated
	* 
	* @since 1.5
	* @deprecated will removed in 2.0
	*/
	public function delete_transient() {
		_deprecated_function( __METHOD__, '1.7.8' );
		delete_transient( 'nav_menu_roles_conflicts' );
	}


	/**
	* Add docu link
	*
	* @since 1.7.3
	* @param array $plugin_meta
	* @param string $plugin_file
	*/
	public function add_action_links( $plugin_meta, $plugin_file ) {
		if( $plugin_file == plugin_basename(__FILE__) ){
			$plugin_meta[] = sprintf( '<a class="dashicons-before dashicons-welcome-learn-more" href="https://wordpress.org/plugins/nav-menu-roles/faq/#conflict">%s</a>', __( 'FAQ', 'nav-menu-roles' ) );
			$plugin_meta[] = '<a class="dashicons-before dashicons-admin-generic" href="' . self::DONATE_URL . '" target="_blank">' . __( 'Donate', 'nav-menu-roles' ) . '</a>';
		}
		return $plugin_meta;
	}


	/**
	* Override the Admin Menu Walker
	* 
	* @since 1.0
	*/
	public function edit_nav_menu_walker( $walker ) {
		if( ! class_exists( 'Walker_Nav_Menu_Edit_Roles' ) ) {

		    if ( self::is_wp_gte( '4.7' ) ) {
				require_once( plugin_dir_path( __FILE__ ) . 'inc/class.Walker_Nav_Menu_Edit_Roles_4.7.php' );
			} else if ( self::is_wp_gte( '4.5' ) ) {
				require_once( plugin_dir_path( __FILE__ ) . 'inc/class.Walker_Nav_Menu_Edit_Roles_4.5.php' );
			} else {
				require_once( plugin_dir_path( __FILE__ ) . 'inc/class.Walker_Nav_Menu_Edit_Roles.php' );
			}
        }
		return 'Walker_Nav_Menu_Edit_Roles';
	}


	/**
	* Add fields to hook added in Walker
	* This will allow us to play nicely with any other plugin that is adding the same hook
	* @params obj $item - the menu item
	* @params array $args
	* @since 1.6.0
	*/
	public function custom_fields( $item_id, $item, $depth, $args ) {
		global $wp_roles;

		/**
		* Pass the menu item to the filter function.
		* This change is suggested as it allows the use of information from the menu item (and
		* by extension the target object) to further customize what filters appear during menu
		* construction.
		*/
		$display_roles = apply_filters( 'nav_menu_roles', $wp_roles->role_names, $item );

		/**
		* If no roles are being used, don't display the role selection radio buttons at all.
		* Unless something deliberately removes the WordPress roles from this list, nothing will
		* be functionally altered to the end user.
		* This change is suggested for the benefit of users constructing granular admin permissions
		* using extensive custom roles as it is an effective means of stopping admins with partial
		* permissions to the menu from accidentally removing all restrictions from a menu item to
		* which they do not have access.
		*/
		if( ! $display_roles ) return;

		/* Get the roles saved for the post. */
		$roles = get_post_meta( $item->ID, '_nav_menu_role', true );

		// By default nothing is checked (will match "everyone" radio).
		$logged_in_out = '';

		// Specific roles are saved as an array, so "in" or an array equals "in" is checked.
		if( is_array( $roles ) || $roles == 'in' ){
			$logged_in_out = 'in';
		} else if ( $roles == 'out' ){
			$logged_in_out = 'out';
		}

		// The specific roles to check.
		$checked_roles = is_array( $roles ) ? $roles : false;

		// Whether to display the role checkboxes.
		$hidden = $logged_in_out == 'in' ? '' : 'display: none;';

		?>

		<input type="hidden" name="nav-menu-role-nonce" value="<?php echo wp_create_nonce( 'nav-menu-nonce-name' ); ?>" />

		<div class="field-nav_menu_role nav_menu_logged_in_out_field description-wide" style="margin: 5px 0;">
		    <span class="description"><?php _e( "Display Mode", 'nav-menu-roles' ); ?></span>
		    <br />

		    <input type="hidden" class="nav-menu-id" value="<?php echo $item->ID ;?>" />

		    <div class="logged-input-holder" style="float: left; width: 35%;">
		        <input type="radio" class="nav-menu-logged-in-out" name="nav-menu-logged-in-out[<?php echo $item->ID ;?>]" id="nav_menu_logged_in-for-<?php echo $item->ID ;?>" <?php checked( 'in', $logged_in_out ); ?> value="in" />
		        <label for="nav_menu_logged_in-for-<?php echo $item->ID ;?>">
		            <?php _e( 'Logged In Users', 'nav-menu-roles'); ?>
		        </label>
		    </div>

		    <div class="logged-input-holder" style="float: left; width: 35%;">
		        <input type="radio" class="nav-menu-logged-in-out" name="nav-menu-logged-in-out[<?php echo $item->ID ;?>]" id="nav_menu_logged_out-for-<?php echo $item->ID ;?>" <?php checked( 'out', $logged_in_out ); ?> value="out" />
		        <label for="nav_menu_logged_out-for-<?php echo $item->ID ;?>">
		            <?php _e( 'Logged Out Users', 'nav-menu-roles'); ?>
		        </label>
		    </div>

		    <div class="logged-input-holder" style="float: left; width: 30%;">
		        <input type="radio" class="nav-menu-logged-in-out" name="nav-menu-logged-in-out[<?php echo $item->ID ;?>]" id="nav_menu_by_role-for-<?php echo $item->ID ;?>" <?php checked( '', $logged_in_out ); ?> value="" />
		        <label for="nav_menu_by_role-for-<?php echo $item->ID ;?>">
		            <?php _e( 'Everyone', 'nav-menu-roles'); ?>
		        </label>
		    </div>

		</div>

		<div class="field-nav_menu_role nav_menu_role_field description-wide" style="margin: 5px 0; <?php echo $hidden;?>">
		    <span class="description"><?php _e( "Restrict menu item to a minimum role", 'nav-menu-roles' ); ?></span>
		    <br />

		    <?php

		    $i = 1;

		    /* Loop through each of the available roles. */
		    foreach ( $display_roles as $role => $name ) {

		        /* If the role has been selected, make sure it's checked. */
		        $checked = checked( true, ( is_array( $checked_roles ) && in_array( $role, $checked_roles ) ), false );

		        ?>

		        <div class="role-input-holder" style="margin: 2px 0;">
		        <input type="checkbox" name="nav-menu-role[<?php echo $item->ID ;?>][<?php echo $i; ?>]" id="nav_menu_role-<?php echo $role; ?>-for-<?php echo $item->ID ;?>" <?php echo $checked; ?> value="<?php echo $role; ?>" />
		        <label for="nav_menu_role-<?php echo $role; ?>-for-<?php echo $item->ID ;?>">
		        <?php echo esc_html( $name ); ?>
		        <?php $i++; ?>
		        </label>
		        </div>

		<?php } ?>

		</div>

		<?php
	}


	/**
	* Save the roles as menu item meta
	* 
	* @since 1.4
	* @return null
	*/
	public function enqueue_scripts( $hook ){
		if ( $hook == 'nav-menus.php' ){
			$suffix = defined( 'SCRIPT_DEBUG' ) && SCRIPT_DEBUG ? '' : '.min';
			wp_enqueue_script( 'nav-menu-roles', plugins_url( 'js/nav-menu-roles' . $suffix . '.js' , __FILE__ ), array( 'jquery' ), self::VERSION, true );
		}
	}

	/**
	* Save the roles as menu item meta
	* 
	* @since 1.0
	* @return string	
	*/
	public function nav_update( $menu_id, $menu_item_db_id ) {
		global $wp_roles;

		$allowed_roles = apply_filters( 'nav_menu_roles', $wp_roles->role_names );

		// Verify this came from our screen and with proper authorization.
		if ( ! isset( $_POST['nav-menu-role-nonce'] ) || ! wp_verify_nonce( $_POST['nav-menu-role-nonce'], 'nav-menu-nonce-name' ) ){
			return;
		}
		
		$saved_data = false;

		if ( isset( $_POST['nav-menu-logged-in-out'][$menu_item_db_id]  )  && $_POST['nav-menu-logged-in-out'][$menu_item_db_id] == 'in' && ! empty ( $_POST['nav-menu-role'][$menu_item_db_id] ) ) {
			
			$custom_roles = array();
			
			// Only save allowed roles.
			foreach( (array) $_POST['nav-menu-role'][$menu_item_db_id] as $role ) {
				if ( array_key_exists ( $role, $allowed_roles ) ) {
					$custom_roles[] = $role;
				}
			}
			if ( ! empty ( $custom_roles ) ) {
				$saved_data = $custom_roles;
			}
		} else if ( isset( $_POST['nav-menu-logged-in-out'][$menu_item_db_id]  ) && in_array( $_POST['nav-menu-logged-in-out'][$menu_item_db_id], array( 'in', 'out' ) ) ) {
			$saved_data = $_POST['nav-menu-logged-in-out'][$menu_item_db_id];
		}

		if ( $saved_data ) {
			update_post_meta( $menu_item_db_id, '_nav_menu_role', $saved_data );
		} else {
			delete_post_meta( $menu_item_db_id, '_nav_menu_role' );
		}
	}

	/**
	* Adds value of new field to $item object
	* is be passed to Walker_Nav_Menu_Edit_Custom
	* 
	* @since 1.0
	*/
	public function setup_nav_item( $menu_item ) {

		if( is_object( $menu_item ) && isset( $menu_item->ID ) ) {

			$roles = get_post_meta( $menu_item->ID, '_nav_menu_role', true );

			if ( ! empty( $roles ) ) {
				$menu_item->roles = $roles;

				// Add the NMR roles as CSS info.
				$new_classes = array();

				switch( $roles ) {
					case 'in' :
						$new_classes[] = 'nmr-logged-in';
						break;
					case 'out' :
						$new_classes[] = 'nmr-logged-out';
						break;
					default:
						if ( is_array( $menu_item->roles ) && ! empty( $menu_item->roles ) ) {
							foreach ( $menu_item->roles as $role ) {
								$new_classes[] = 'nmr-' . $role;
							}
						}
						break;
				}

				// Only apply classes on front-end.
				if( ! is_admin() ) {
					$menu_item->classes = array_unique( array_merge( $menu_item->classes, $new_classes ) );
				}
			}
		}
		return $menu_item;
	}

	/**
	 * Exclude menu items via wp_get_nav_menu_items filter
	 * this fixes plugin's incompatibility with theme's that use their own custom Walker
	 * Thanks to Evan Stein @vanpop http://vanpop.com/
	 *
	 * @since 1.2
	 *
	 * @param  WP_Post[] array of Nav Menu Post objects
	 *
	 * Multisite compatibility added in 1.9.0
	 * by @open-dsi https://www.open-dsi.fr/ with props to @fiech
	 */
	public function exclude_menu_items( $items ) {

		$hide_children_of = array();

		if( ! empty( $items ) ) {

			// Iterate over the items to search and destroy.
			foreach ( $items as $key => $item ) {

				$visible = true;

				// Hide any item that is the child of a hidden item.
				if( isset( $item->menu_item_parent ) && in_array( $item->menu_item_parent, $hide_children_of ) ){
					$visible = false;
				}

				// Check any item that has NMR roles set.
				if( $visible && isset( $item->roles ) ) {

					// Check all logged in, all logged out, or role.
					switch( $item->roles ) {
						case 'in' :
							/**
							 * Multisite compatibility.
							 *
							 * For the logged in condition to work,
							 * the user has to be a logged in member of the current blog
							 * or be a logged in super user.
							 */
							$visible = is_user_member_of_blog() || is_super_admin() ? true : false;
							break;
						case 'out' :
							/**
							 * Multisite compatibility.
							 *
							 * For the logged out condition to work,
							 * the user has to be either logged out
							 * or not be a member of the current blog.
							 * But they also may not be a super admin,
							 * because logged in super admins should see the internal stuff, not the external.
							 */
							$visible = ! is_user_member_of_blog() && ! is_super_admin() ? true : false;
							break;
						default:
							$visible = false;
							if ( is_array( $item->roles ) && ! empty( $item->roles ) ) {
								foreach ( $item->roles as $role ) {
									if ( current_user_can( $role ) ) {
										$visible = true;
										break;
									}
								}
							}

							break;
					}

				}

				/*
				 * Filter: nav_menu_roles_item_visibility
				 * Add filter to work with plugins that don't use traditional roles
				 *
				 * @param bool $visible
				 * @param object $item
				 */ 
				$visible = apply_filters( 'nav_menu_roles_item_visibility', $visible, $item );

				// Unset non-visible item.
				if ( ! $visible ) {
					if( isset( $item->ID ) ) {
						$hide_children_of[] = $item->ID; // Store ID of item to hide it's children.
					}
					unset( $items[$key] ) ;
				}

			}

		}

		return $items;
	}


	/**
	* Maybe upgrade
	*
	* @access public
	* @return void
	*/
	public function maybe_upgrade() {
		$db_version = get_option( 'nav_menu_roles_db_version', false );

		// 1.7.7 upgrade: changed the debug notice so the old transient is invalid.
		if ( $db_version === false || version_compare( '1.7.7', $db_version, '<' ) ) {
		    update_option( 'nav_menu_roles_db_version', self::VERSION );
		}
	}

	/**
	* Test WordPress version
	*
	* @access public
	* @param  string $version - A WordPress version to compare against current version.
	* @return boolean
	*/
	public static function is_wp_gte( $version = '5.4' ) {
		global $wp_version;
		return version_compare( strtolower( $wp_version ), strtolower( $version ), '>=' );
	}

} // end class

endif; // class_exists check


/**
 * Launch the whole plugin
 * Returns the main instance of Nav Menu Roles to prevent the need to use globals.
 *
 * @since  1.5
 * @return Nav_Menu_Roles
*/
function Nav_Menu_Roles() {
	return Nav_Menu_Roles::instance();
}

// Global for backwards compatibility.
$GLOBALS['Nav_Menu_Roles'] = Nav_Menu_Roles();