/wp-includes/capabilities.php

<?php

/**

 * WordPress Roles and Capabilities.

 *

 * @package WordPress

 * @subpackage User

 */



/**

 * WordPress User Roles.

 *

 * The role option is simple, the structure is organized by role name that store

 * the name in value of the 'name' key. The capabilities are stored as an array

 * in the value of the 'capability' key.

 *

 * <code>

 * array (

 *		'rolename' => array (

 *			'name' => 'rolename',

 *			'capabilities' => array()

 *		)

 * )

 * </code>

 *

 * @since 2.0.0

 * @package WordPress

 * @subpackage User

 */

class WP_Roles {

	/**

	 * List of roles and capabilities.

	 *

	 * @since 2.0.0

	 * @access public

	 * @var array

	 */

	var $roles;



	/**

	 * List of the role objects.

	 *

	 * @since 2.0.0

	 * @access public

	 * @var array

	 */

	var $role_objects = array();



	/**

	 * List of role names.

	 *

	 * @since 2.0.0

	 * @access public

	 * @var array

	 */

	var $role_names = array();



	/**

	 * Option name for storing role list.

	 *

	 * @since 2.0.0

	 * @access public

	 * @var string

	 */

	var $role_key;



	/**

	 * Whether to use the database for retrieval and storage.

	 *

	 * @since 2.1.0

	 * @access public

	 * @var bool

	 */

	var $use_db = true;



	/**

	 * Constructor

	 *

	 * @since 2.0.0

	 */

	function __construct() {

		$this->_init();

	}



	/**

	 * Set up the object properties.

	 *

	 * The role key is set to the current prefix for the $wpdb object with

	 * 'user_roles' appended. If the $wp_user_roles global is set, then it will

	 * be used and the role option will not be updated or used.

	 *

	 * @since 2.1.0

	 * @access protected

	 * @uses $wpdb Used to get the database prefix.

	 * @global array $wp_user_roles Used to set the 'roles' property value.

	 */

	function _init () {

		global $wpdb, $wp_user_roles;

		$this->role_key = $wpdb->prefix . 'user_roles';

		if ( ! empty( $wp_user_roles ) ) {

			$this->roles = $wp_user_roles;

			$this->use_db = false;

		} else {

			$this->roles = get_option( $this->role_key );

		}



		if ( empty( $this->roles ) )

			return;



		$this->role_objects = array();

		$this->role_names =  array();

		foreach ( (array) $this->roles as $role => $data ) {

			$this->role_objects[$role] = new WP_Role( $role, $this->roles[$role]['capabilities'] );

			$this->role_names[$role] = $this->roles[$role]['name'];

		}

	}



	/**

	 * Add role name with capabilities to list.

	 *

	 * Updates the list of roles, if the role doesn't already exist.

	 *

	 * The capabilities are defined in the following format `array( 'read' => true );`

	 * To explicitly deny a role a capability you set the value for that capability to false.

	 *

	 * @since 2.0.0

	 * @access public

	 *

	 * @param string $role Role name.

	 * @param string $display_name Role display name.

	 * @param array $capabilities List of role capabilities in the above format.

	 * @return null|WP_Role WP_Role object if role is added, null if already exists.

	 */

	function add_role( $role, $display_name, $capabilities = array() ) {

		if ( isset( $this->roles[$role] ) )

			return;



		$this->roles[$role] = array(

			'name' => $display_name,

			'capabilities' => $capabilities

			);

		if ( $this->use_db )

			update_option( $this->role_key, $this->roles );

		$this->role_objects[$role] = new WP_Role( $role, $capabilities );

		$this->role_names[$role] = $display_name;

		return $this->role_objects[$role];

	}



	/**

	 * Remove role by name.

	 *

	 * @since 2.0.0

	 * @access public

	 *

	 * @param string $role Role name.

	 */

	function remove_role( $role ) {

		if ( ! isset( $this->role_objects[$role] ) )

			return;



		unset( $this->role_objects[$role] );

		unset( $this->role_names[$role] );

		unset( $this->roles[$role] );



		if ( $this->use_db )

			update_option( $this->role_key, $this->roles );

	}



	/**

	 * Add capability to role.

	 *

	 * @since 2.0.0

	 * @access public

	 *

	 * @param string $role Role name.

	 * @param string $cap Capability name.

	 * @param bool $grant Optional, default is true. Whether role is capable of performing capability.

	 */

	function add_cap( $role, $cap, $grant = true ) {

		$this->roles[$role]['capabilities'][$cap] = $grant;

		if ( $this->use_db )

			update_option( $this->role_key, $this->roles );

	}



	/**

	 * Remove capability from role.

	 *

	 * @since 2.0.0

	 * @access public

	 *

	 * @param string $role Role name.

	 * @param string $cap Capability name.

	 */

	function remove_cap( $role, $cap ) {

		unset( $this->roles[$role]['capabilities'][$cap] );

		if ( $this->use_db )

			update_option( $this->role_key, $this->roles );

	}



	/**

	 * Retrieve role object by name.

	 *

	 * @since 2.0.0

	 * @access public

	 *

	 * @param string $role Role name.

	 * @return object|null Null, if role does not exist. WP_Role object, if found.

	 */

	function &get_role( $role ) {

		if ( isset( $this->role_objects[$role] ) )

			return $this->role_objects[$role];

		else

			return null;

	}



	/**

	 * Retrieve list of role names.

	 *

	 * @since 2.0.0

	 * @access public

	 *

	 * @return array List of role names.

	 */

	function get_names() {

		return $this->role_names;

	}



	/**

	 * Whether role name is currently in the list of available roles.

	 *

	 * @since 2.0.0

	 * @access public

	 *

	 * @param string $role Role name to look up.

	 * @return bool

	 */

	function is_role( $role )

	{

		return isset( $this->role_names[$role] );

	}

}



/**

 * WordPress Role class.

 *

 * @since 2.0.0

 * @package WordPress

 * @subpackage User

 */

class WP_Role {

	/**

	 * Role name.

	 *

	 * @since 2.0.0

	 * @access public

	 * @var string

	 */

	var $name;



	/**

	 * List of capabilities the role contains.

	 *

	 * @since 2.0.0

	 * @access public

	 * @var array

	 */

	var $capabilities;



	/**

	 * Constructor - Set up object properties.

	 *

	 * The list of capabilities, must have the key as the name of the capability

	 * and the value a boolean of whether it is granted to the role.

	 *

	 * @since 2.0.0

	 * @access public

	 *

	 * @param string $role Role name.

	 * @param array $capabilities List of capabilities.

	 */

	function __construct( $role, $capabilities ) {

		$this->name = $role;

		$this->capabilities = $capabilities;

	}



	/**

	 * Assign role a capability.

	 *

	 * @see WP_Roles::add_cap() Method uses implementation for role.

	 * @since 2.0.0

	 * @access public

	 *

	 * @param string $cap Capability name.

	 * @param bool $grant Whether role has capability privilege.

	 */

	function add_cap( $cap, $grant = true ) {

		global $wp_roles;



		if ( ! isset( $wp_roles ) )

			$wp_roles = new WP_Roles();



		$this->capabilities[$cap] = $grant;

		$wp_roles->add_cap( $this->name, $cap, $grant );

	}



	/**

	 * Remove capability from role.

	 *

	 * This is a container for {@link WP_Roles::remove_cap()} to remove the

	 * capability from the role. That is to say, that {@link

	 * WP_Roles::remove_cap()} implements the functionality, but it also makes

	 * sense to use this class, because you don't need to enter the role name.

	 *

	 * @since 2.0.0

	 * @access public

	 *

	 * @param string $cap Capability name.

	 */

	function remove_cap( $cap ) {

		global $wp_roles;



		if ( ! isset( $wp_roles ) )

			$wp_roles = new WP_Roles();



		unset( $this->capabilities[$cap] );

		$wp_roles->remove_cap( $this->name, $cap );

	}



	/**

	 * Whether role has capability.

	 *

	 * The capabilities is passed through the 'role_has_cap' filter. The first

	 * parameter for the hook is the list of capabilities the class has

	 * assigned. The second parameter is the capability name to look for. The

	 * third and final parameter for the hook is the role name.

	 *

	 * @since 2.0.0

	 * @access public

	 *

	 * @param string $cap Capability name.

	 * @return bool True, if user has capability. False, if doesn't have capability.

	 */

	function has_cap( $cap ) {

		$capabilities = apply_filters( 'role_has_cap', $this->capabilities, $cap, $this->name );

		if ( !empty( $capabilities[$cap] ) )

			return $capabilities[$cap];

		else

			return false;

	}



}



/**

 * WordPress User class.

 *

 * @since 2.0.0

 * @package WordPress

 * @subpackage User

 */

class WP_User {

	/**

	 * User data container.

	 *

	 * This will be set as properties of the object.

	 *

	 * @since 2.0.0

	 * @access private

	 * @var array

	 */

	var $data;



	/**

	 * The user's ID.

	 *

	 * @since 2.1.0

	 * @access public

	 * @var int

	 */

	var $ID = 0;



	/**

	 * The deprecated user's ID.

	 *

	 * @since 2.0.0

	 * @access public

	 * @deprecated Use WP_User::$ID

	 * @see WP_User::$ID

	 * @var int

	 */

	var $id = 0;



	/**

	 * The individual capabilities the user has been given.

	 *

	 * @since 2.0.0

	 * @access public

	 * @var array

	 */

	var $caps = array();



	/**

	 * User metadata option name.

	 *

	 * @since 2.0.0

	 * @access public

	 * @var string

	 */

	var $cap_key;



	/**

	 * The roles the user is part of.

	 *

	 * @since 2.0.0

	 * @access public

	 * @var array

	 */

	var $roles = array();



	/**

	 * All capabilities the user has, including individual and role based.

	 *

	 * @since 2.0.0

	 * @access public

	 * @var array

	 */

	var $allcaps = array();



	/**

	 * First name of the user.

	 *

	 * Created to prevent notices.

	 *

	 * @since 2.7.0

	 * @access public

	 * @var string

	 */

	var $first_name = '';



	/**

	 * Last name of the user.

	 *

	 * Created to prevent notices.

	 *

	 * @since 2.7.0

	 * @access public

	 * @var string

	 */

	var $last_name = '';



	/**

	 * The filter context applied to user data fields.

	 *

	 * @since 2.9.0

	 * @access private

	 * @var string

	 */

	var $filter = null;



	/**

	 * Constructor - Sets up the object properties.

	 *

	 * Retrieves the userdata and then assigns all of the data keys to direct

	 * properties of the object. Calls {@link WP_User::_init_caps()} after

	 * setting up the object's user data properties.

	 *

	 * @since 2.0.0

	 * @access public

	 *

	 * @param int|string $id User's ID or username

	 * @param int $name Optional. User's username

	 * @param int $blog_id Optional Blog ID, defaults to current blog.

	 * @return WP_User

	 */

	function __construct( $id, $name = '', $blog_id = '' ) {



		if ( empty( $id ) && empty( $name ) )

			return;



		if ( ! is_numeric( $id ) ) {

			$name = $id;

			$id = 0;

		}



		if ( ! empty( $id ) )

			$this->data = get_userdata( $id );

		else

			$this->data = get_userdatabylogin( $name );



		if ( empty( $this->data->ID ) )

			return;



		foreach ( get_object_vars( $this->data ) as $key => $value ) {

			$this->{$key} = $value;

		}



		$this->id = $this->ID;

		$this->for_blog( $blog_id );

	}



	/**

	 * Set up capability object properties.

	 *

	 * Will set the value for the 'cap_key' property to current database table

	 * prefix, followed by 'capabilities'. Will then check to see if the

	 * property matching the 'cap_key' exists and is an array. If so, it will be

	 * used.

	 *

	 * @since 2.1.0

	 *

	 * @param string $cap_key Optional capability key

	 * @access protected

	 */

	function _init_caps( $cap_key = '' ) {

		global $wpdb;

		if ( empty($cap_key) )

			$this->cap_key = $wpdb->prefix . 'capabilities';

		else

			$this->cap_key = $cap_key;

		$this->caps = &$this->{$this->cap_key};

		if ( ! is_array( $this->caps ) )

			$this->caps = array();

		$this->get_role_caps();

	}



	/**

	 * Retrieve all of the role capabilities and merge with individual capabilities.

	 *

	 * All of the capabilities of the roles the user belongs to are merged with

	 * the users individual roles. This also means that the user can be denied

	 * specific roles that their role might have, but the specific user isn't

	 * granted permission to.

	 *

	 * @since 2.0.0

	 * @uses $wp_roles

	 * @access public

	 */

	function get_role_caps() {

		global $wp_roles;



		if ( ! isset( $wp_roles ) )

			$wp_roles = new WP_Roles();



		//Filter out caps that are not role names and assign to $this->roles

		if ( is_array( $this->caps ) )

			$this->roles = array_filter( array_keys( $this->caps ), array( &$wp_roles, 'is_role' ) );



		//Build $allcaps from role caps, overlay user's $caps

		$this->allcaps = array();

		foreach ( (array) $this->roles as $role ) {

			$the_role =& $wp_roles->get_role( $role );

			$this->allcaps = array_merge( (array) $this->allcaps, (array) $the_role->capabilities );

		}

		$this->allcaps = array_merge( (array) $this->allcaps, (array) $this->caps );

	}



	/**

	 * Add role to user.

	 *

	 * Updates the user's meta data option with capabilities and roles.

	 *

	 * @since 2.0.0

	 * @access public

	 *

	 * @param string $role Role name.

	 */

	function add_role( $role ) {

		$this->caps[$role] = true;

		update_user_meta( $this->ID, $this->cap_key, $this->caps );

		$this->get_role_caps();

		$this->update_user_level_from_caps();

	}



	/**

	 * Remove role from user.

	 *

	 * @since 2.0.0

	 * @access public

	 *

	 * @param string $role Role name.

	 */

	function remove_role( $role ) {

		if ( !in_array($role, $this->roles) )

			return;

		unset( $this->caps[$role] );

		update_user_meta( $this->ID, $this->cap_key, $this->caps );

		$this->get_role_caps();

		$this->update_user_level_from_caps();

	}



	/**

	 * Set the role of the user.

	 *

	 * This will remove the previous roles of the user and assign the user the

	 * new one. You can set the role to an empty string and it will remove all

	 * of the roles from the user.

	 *

	 * @since 2.0.0

	 * @access public

	 *

	 * @param string $role Role name.

	 */

	function set_role( $role ) {

		foreach ( (array) $this->roles as $oldrole )

			unset( $this->caps[$oldrole] );



		if ( 1 == count( $this->roles ) && $role == $this->roles[0] )

			return;



		if ( !empty( $role ) ) {

			$this->caps[$role] = true;

			$this->roles = array( $role => true );

		} else {

			$this->roles = false;

		}

		update_user_meta( $this->ID, $this->cap_key, $this->caps );

		$this->get_role_caps();

		$this->update_user_level_from_caps();

		do_action( 'set_user_role', $this->ID, $role );

	}



	/**

	 * Choose the maximum level the user has.

	 *

	 * Will compare the level from the $item parameter against the $max

	 * parameter. If the item is incorrect, then just the $max parameter value

	 * will be returned.

	 *

	 * Used to get the max level based on the capabilities the user has. This

	 * is also based on roles, so if the user is assigned the Administrator role

	 * then the capability 'level_10' will exist and the user will get that

	 * value.

	 *

	 * @since 2.0.0

	 * @access public

	 *

	 * @param int $max Max level of user.

	 * @param string $item Level capability name.

	 * @return int Max Level.

	 */

	function level_reduction( $max, $item ) {

		if ( preg_match( '/^level_(10|[0-9])$/i', $item, $matches ) ) {

			$level = intval( $matches[1] );

			return max( $max, $level );

		} else {

			return $max;

		}

	}



	/**

	 * Update the maximum user level for the user.

	 *

	 * Updates the 'user_level' user metadata (includes prefix that is the

	 * database table prefix) with the maximum user level. Gets the value from

	 * the all of the capabilities that the user has.

	 *

	 * @since 2.0.0

	 * @access public

	 */

	function update_user_level_from_caps() {

		global $wpdb;

		$this->user_level = array_reduce( array_keys( $this->allcaps ), array( &$this, 'level_reduction' ), 0 );

		update_user_meta( $this->ID, $wpdb->prefix . 'user_level', $this->user_level );

	}



	/**

	 * Add capability and grant or deny access to capability.

	 *

	 * @since 2.0.0

	 * @access public

	 *

	 * @param string $cap Capability name.

	 * @param bool $grant Whether to grant capability to user.

	 */

	function add_cap( $cap, $grant = true ) {

		$this->caps[$cap] = $grant;

		update_user_meta( $this->ID, $this->cap_key, $this->caps );

	}



	/**

	 * Remove capability from user.

	 *

	 * @since 2.0.0

	 * @access public

	 *

	 * @param string $cap Capability name.

	 */

	function remove_cap( $cap ) {

		if ( empty( $this->caps[$cap] ) )

			return;

		unset( $this->caps[$cap] );

		update_user_meta( $this->ID, $this->cap_key, $this->caps );

	}



	/**

	 * Remove all of the capabilities of the user.

	 *

	 * @since 2.1.0

	 * @access public

	 */

	function remove_all_caps() {

		global $wpdb;

		$this->caps = array();

		delete_user_meta( $this->ID, $this->cap_key );

		delete_user_meta( $this->ID, $wpdb->prefix . 'user_level' );

		$this->get_role_caps();

	}



	/**

	 * Whether user has capability or role name.

	 *

	 * This is useful for looking up whether the user has a specific role

	 * assigned to the user. The second optional parameter can also be used to

	 * check for capabilities against a specfic post.

	 *

	 * @since 2.0.0

	 * @access public

	 *

	 * @param string|int $cap Capability or role name to search.

	 * @param int $post_id Optional. Post ID to check capability against specific post.

	 * @return bool True, if user has capability; false, if user does not have capability.

	 */

	function has_cap( $cap ) {

		if ( is_numeric( $cap ) ) {

			_deprecated_argument( __FUNCTION__, '2.0', __('Usage of user levels by plugins and themes is deprecated. Use roles and capabilities instead.') );

			$cap = $this->translate_level_to_cap( $cap );

		}



		$args = array_slice( func_get_args(), 1 );

		$args = array_merge( array( $cap, $this->ID ), $args );

		$caps = call_user_func_array( 'map_meta_cap', $args );



		// Multisite super admin has all caps by definition, Unless specifically denied.

		if ( is_multisite() && is_super_admin( $this->ID ) ) {

			if ( in_array('do_not_allow', $caps) )

				return false;

			return true;

		}



		// Must have ALL requested caps

		$capabilities = apply_filters( 'user_has_cap', $this->allcaps, $caps, $args );

		$capabilities['exist'] = true; // Everyone is allowed to exist

		foreach ( (array) $caps as $cap ) {

			//echo "Checking cap $cap<br />";

			if ( empty( $capabilities[$cap] ) || !$capabilities[$cap] )

				return false;

		}



		return true;

	}



	/**

	 * Convert numeric level to level capability name.

	 *

	 * Prepends 'level_' to level number.

	 *

	 * @since 2.0.0

	 * @access public

	 *

	 * @param int $level Level number, 1 to 10.

	 * @return string

	 */

	function translate_level_to_cap( $level ) {

		return 'level_' . $level;

	}



	/**

	 * Set the blog to operate on. Defaults to the current blog.

	 *

	 * @since 3.0.0

	 *

	 * @param int $blog_id Optional Blog ID, defaults to current blog.

	 */

	function for_blog( $blog_id = '' ) {

		global $wpdb;

		if ( ! empty( $blog_id ) )

			$cap_key = $wpdb->get_blog_prefix( $blog_id ) . 'capabilities';

		else

			$cap_key = '';

		$this->_init_caps( $cap_key );

	}

}



/**

 * Map meta capabilities to primitive capabilities.

 *

 * This does not actually compare whether the user ID has the actual capability,

 * just what the capability or capabilities are. Meta capability list value can

 * be 'delete_user', 'edit_user', 'remove_user', 'promote_user', 'delete_post',

 * 'delete_page', 'edit_post', 'edit_page', 'read_post', or 'read_page'.

 *

 * @since 2.0.0

 *

 * @param string $cap Capability name.

 * @param int $user_id User ID.

 * @return array Actual capabilities for meta capability.

 */

function map_meta_cap( $cap, $user_id ) {

	$args = array_slice( func_get_args(), 2 );

	$caps = array();



	switch ( $cap ) {

	case 'remove_user':

		$caps[] = 'remove_users';

		break;

	case 'promote_user':

		$caps[] = 'promote_users';

		break;

	case 'edit_user':

		// Allow user to edit itself

		if ( isset( $args[0] ) && $user_id == $args[0] )

			break;

		// Fall through

	case 'edit_users':

		// If multisite these caps are allowed only for super admins.

		if ( is_multisite() && !is_super_admin( $user_id ) )

			$caps[] = 'do_not_allow';

		else

			$caps[] = 'edit_users'; // Explicit due to primitive fall through

		break;

	case 'delete_post':

	case 'delete_page':

		$author_data = get_userdata( $user_id );

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



		if ( 'revision' == $post->post_type ) {

			$post = get_post( $post->post_parent );

		}



		$post_type = get_post_type_object( $post->post_type );



		if ( ! $post_type->map_meta_cap ) {

			$caps[] = $post_type->cap->$cap;

			// Prior to 3.1 we would re-call map_meta_cap here.

			if ( 'delete_post' == $cap )

				$cap = $post_type->cap->$cap;

			break;

		}



		if ( '' != $post->post_author ) {

			$post_author_data = get_userdata( $post->post_author );

		} else {

			// No author set yet, so default to current user for cap checks.

			$post_author_data = $author_data;

		}



		// If the user is the author...

		if ( is_object( $post_author_data ) && $user_id == $post_author_data->ID ) {

			// If the post is published...

			if ( 'publish' == $post->post_status ) {

				$caps[] = $post_type->cap->delete_published_posts;

			} elseif ( 'trash' == $post->post_status ) {

				if ('publish' == get_post_meta($post->ID, '_wp_trash_meta_status', true) )

					$caps[] = $post_type->cap->delete_published_posts;

			} else {

				// If the post is draft...

				$caps[] = $post_type->cap->delete_posts;

			}

		} else {

			// The user is trying to edit someone else's post.

			$caps[] = $post_type->cap->delete_others_posts;

			// The post is published, extra cap required.

			if ( 'publish' == $post->post_status )

				$caps[] = $post_type->cap->delete_published_posts;

			elseif ( 'private' == $post->post_status )

				$caps[] = $post_type->cap->delete_private_posts;

		}

		break;

		// edit_post breaks down to edit_posts, edit_published_posts, or

		// edit_others_posts

	case 'edit_post':

	case 'edit_page':

		$author_data = get_userdata( $user_id );

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



		if ( 'revision' == $post->post_type ) {

			$post = get_post( $post->post_parent );

		}



		$post_type = get_post_type_object( $post->post_type );



		if ( ! $post_type->map_meta_cap ) {

			$caps[] = $post_type->cap->$cap;

			// Prior to 3.1 we would re-call map_meta_cap here.

			if ( 'edit_post' == $cap )

				$cap = $post_type->cap->$cap;

			break;

		}



		if ( '' != $post->post_author ) {

			$post_author_data = get_userdata( $post->post_author );

		} else {

			// No author set yet, so default to current user for cap checks.

			$post_author_data = $author_data;

		}



		//echo "current user id : $user_id, post author id: " . $post_author_data->ID . "<br />";

		// If the user is the author...

		if ( is_object( $post_author_data ) && $user_id == $post_author_data->ID ) {

			// If the post is published...

			if ( 'publish' == $post->post_status ) {

				$caps[] = $post_type->cap->edit_published_posts;

			} elseif ( 'trash' == $post->post_status ) {

				if ('publish' == get_post_meta($post->ID, '_wp_trash_meta_status', true) )

					$caps[] = $post_type->cap->edit_published_posts;

			} else {

				// If the post is draft...

				$caps[] = $post_type->cap->edit_posts;

			}

		} else {

			// The user is trying to edit someone else's post.

			$caps[] = $post_type->cap->edit_others_posts;

			// The post is published, extra cap required.

			if ( 'publish' == $post->post_status )

				$caps[] = $post_type->cap->edit_published_posts;

			elseif ( 'private' == $post->post_status )

				$caps[] = $post_type->cap->edit_private_posts;

		}

		break;

	case 'read_post':

	case 'read_page':

		$author_data = get_userdata( $user_id );

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



		if ( 'revision' == $post->post_type ) {

			$post = get_post( $post->post_parent );

		}



		$post_type = get_post_type_object( $post->post_type );



		if ( ! $post_type->map_meta_cap ) {

			$caps[] = $post_type->cap->$cap;

			// Prior to 3.1 we would re-call map_meta_cap here.

			if ( 'read_post' == $cap )

				$cap = $post_type->cap->$cap;

			break;

		}



		if ( 'private' != $post->post_status ) {

			$caps[] = $post_type->cap->read;

			break;

		}



		if ( '' != $post->post_author ) {

			$post_author_data = get_userdata( $post->post_author );

		} else {

			// No author set yet, so default to current user for cap checks.

			$post_author_data = $author_data;

		}



		if ( is_object( $post_author_data ) && $user_id == $post_author_data->ID )

			$caps[] = $post_type->cap->read;

		else

			$caps[] = $post_type->cap->read_private_posts;

		break;

	case 'edit_comment':

		$comment = get_comment( $args[0] );

		$post = get_post( $comment->comment_post_ID );

		$post_type_object = get_post_type_object( $post->post_type );



		$caps = map_meta_cap( $post_type_object->cap->edit_post, $user_id, $post->ID );

		break;

	case 'unfiltered_upload':

		if ( defined('ALLOW_UNFILTERED_UPLOADS') && ALLOW_UNFILTERED_UPLOADS && ( !is_multisite() || is_super_admin( $user_id ) )  )

			$caps[] = $cap;

		else

			$caps[] = 'do_not_allow';

		break;

	case 'edit_files':

	case 'edit_plugins':

	case 'edit_themes':

		if ( defined('DISALLOW_FILE_EDIT') && DISALLOW_FILE_EDIT ) {

			$caps[] = 'do_not_allow';

			break;

		}

		// Fall through if not DISALLOW_FILE_EDIT.

	case 'update_plugins':

	case 'delete_plugins':

	case 'install_plugins':

	case 'update_themes':

	case 'delete_themes':

	case 'install_themes':

	case 'update_core':

		// Disallow anything that creates, deletes, or edits core, plugin, or theme files.

		// Files in uploads are excepted.

		if ( defined('DISALLOW_FILE_MODS') && DISALLOW_FILE_MODS ) {

			$caps[] = 'do_not_allow';

			break;

		}

		// Fall through if not DISALLOW_FILE_MODS.

	case 'unfiltered_html':

		// Disallow unfiltered_html for all users, even admins and super admins.

		if ( defined('DISALLOW_UNFILTERED_HTML') && DISALLOW_UNFILTERED_HTML ) {

			$caps[] = 'do_not_allow';

			break;

		}

		// Fall through if not DISALLOW_UNFILTERED_HTML

	case 'delete_user':

	case 'delete_users':

		// If multisite these caps are allowed only for super admins.

		if ( is_multisite() && !is_super_admin( $user_id ) ) {

			$caps[] = 'do_not_allow';

		} else {

			if ( 'delete_user' == $cap )

				$cap = 'delete_users';

			$caps[] = $cap;

		}

		break;

	case 'create_users':

		if ( !is_multisite() )

			$caps[] = $cap;

		elseif ( is_super_admin() || get_site_option( 'add_new_users' ) )

			$caps[] = $cap;

		else

			$caps[] = 'do_not_allow';

		break;

	default:

		// Handle meta capabilities for custom post types.

		$post_type_meta_caps = _post_type_meta_capabilities();

		if ( isset( $post_type_meta_caps[ $cap ] ) ) {

			$args = array_merge( array( $post_type_meta_caps[ $cap ], $user_id ), $args );

			return call_user_func_array( 'map_meta_cap', $args );

		}



		// If no meta caps match, return the original cap.

		$caps[] = $cap;

	}



	return apply_filters('map_meta_cap', $caps, $cap, $user_id, $args);

}



/**

 * Whether current user has capability or role.

 *

 * @since 2.0.0

 *

 * @param string $capability Capability or role name.

 * @return bool

 */

function current_user_can( $capability ) {

	$current_user = wp_get_current_user();



	if ( empty( $current_user ) )

		return false;



	$args = array_slice( func_get_args(), 1 );

	$args = array_merge( array( $capability ), $args );



	return call_user_func_array( array( &$current_user, 'has_cap' ), $args );

}



/**

 * Whether current user has a capability or role for a given blog.

 *

 * @since 3.0.0

 *

 * @param int $blog_id Blog ID

 * @param string $capability Capability or role name.

 * @return bool

 */

function current_user_can_for_blog( $blog_id, $capability ) {

	$current_user = wp_get_current_user();



	if ( empty( $current_user ) )

		return false;



	// Create new object to avoid stomping the global current_user.

	$user = new WP_User( $current_user->id) ;



	// Set the blog id.  @todo add blog id arg to WP_User constructor?

	$user->for_blog( $blog_id );



	$args = array_slice( func_get_args(), 2 );

	$args = array_merge( array( $capability ), $args );



	return call_user_func_array( array( &$user, 'has_cap' ), $args );

}



/**

 * Whether author of supplied post has capability or role.

 *

 * @since 2.9.0

 *

 * @param int|object $post Post ID or post object.

 * @param string $capability Capability or role name.

 * @return bool

 */

function author_can( $post, $capability ) {

	if ( !$post = get_post($post) )

		return false;



	$author = new WP_User( $post->post_author );



	if ( empty( $author->ID ) )

		return false;



	$args = array_slice( func_get_args(), 2 );

	$args = array_merge( array( $capability ), $args );



	return call_user_func_array( array( &$author, 'has_cap' ), $args );

}



/**

 * Whether a particular user has capability or role.

 *

 * @since 3.1.0

 *

 * @param int|object $user User ID or object.

 * @param string $capability Capability or role name.

 * @return bool

 */

function user_can( $user, $capability ) {

	if ( ! is_object( $user ) )

		$user = new WP_User( $user );



	if ( ! $user || ! $user->ID )

		return false;



	$args = array_slice( func_get_args(), 2 );

	$args = array_merge( array( $capability ), $args );



	return call_user_func_array( array( &$user, 'has_cap' ), $args );

}



/**

 * Retrieve role object.

 *

 * @see WP_Roles::get_role() Uses method to retrieve role object.

 * @since 2.0.0

 *

 * @param string $role Role name.

 * @return object

 */

function get_role( $role ) {

	global $wp_roles;



	if ( ! isset( $wp_roles ) )

		$wp_roles = new WP_Roles();



	return $wp_roles->get_role( $role );

}



/**

 * Add role, if it does not exist.

 *

 * @see WP_Roles::add_role() Uses method to add role.

 * @since 2.0.0

 *

 * @param string $role Role name.

 * @param string $display_name Display name for role.

 * @param array $capabilities List of capabilities, e.g. array( 'edit_posts' => true, 'delete_posts' => false );

 * @return null|WP_Role WP_Role object if role is added, null if already exists.

 */

function add_role( $role, $display_name, $capabilities = array() ) {

	global $wp_roles;



	if ( ! isset( $wp_roles ) )

		$wp_roles = new WP_Roles();



	return $wp_roles->add_role( $role, $display_name, $capabilities );

}



/**

 * Remove role, if it exists.

 *

 * @see WP_Roles::remove_role() Uses method to remove role.

 * @since 2.0.0

 *

 * @param string $role Role name.

 * @return null

 */

function remove_role( $role ) {

	global $wp_roles;



	if ( ! isset( $wp_roles ) )

		$wp_roles = new WP_Roles();



	return $wp_roles->remove_role( $role );

}



/**

 * Retrieve a list of super admins.

 *

 * @since 3.0.0

 *

 * @uses $super_admins Super admins global variable, if set.

 *

 * @return array List of super admin logins

 */

function get_super_admins() {

	global $super_admins;



	if ( isset($super_admins) )

		return $super_admins;

	else

		return get_site_option( 'site_admins', array('admin') );

}



/**

 * Determine if user is a site admin.

 *

 * @since 3.0.0

 *

 * @param int $user_id (Optional) The ID of a user. Defaults to the current user.

 * @return bool True if the user is a site admin.

 */

function is_super_admin( $user_id = false ) {

	if ( $user_id )

		$user = new WP_User( $user_id );

	else

		$user = wp_get_current_user();



	if ( empty( $user->id ) )

		return false;



	if ( is_multisite() ) {

		$super_admins = get_super_admins();

		if ( is_array( $super_admins ) && in_array( $user->user_login, $super_admins ) )

			return true;

	} else {

		if ( $user->has_cap('delete_users') )

			return true;

	}



	return false;

}



?>