Wordpress 3.6
[autoinstalls/wordpress.git] / wp-includes / capabilities.php
index 2b4fd79ce74873ec9a5e0d24f0180730e8092b3f..c3bb58f627a7895a16711012b9ca013868835b9b 100644 (file)
@@ -73,19 +73,16 @@ class WP_Roles {
        var $use_db = true;
 
        /**
-        * PHP4 Constructor - Call {@link WP_Roles::_init()} method.
+        * Constructor
         *
         * @since 2.0.0
-        * @access public
-        *
-        * @return WP_Roles
         */
-       function WP_Roles() {
+       function __construct() {
                $this->_init();
        }
 
        /**
-        * Setup the object properties.
+        * 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
@@ -97,8 +94,7 @@ class WP_Roles {
         * @global array $wp_user_roles Used to set the 'roles' property value.
         */
        function _init () {
-               global $wpdb;
-               global $wp_user_roles;
+               global $wpdb, $wp_user_roles;
                $this->role_key = $wpdb->prefix . 'user_roles';
                if ( ! empty( $wp_user_roles ) ) {
                        $this->roles = $wp_user_roles;
@@ -112,7 +108,37 @@ class WP_Roles {
 
                $this->role_objects = array();
                $this->role_names =  array();
-               foreach ( (array) $this->roles as $role => $data ) {
+               foreach ( array_keys( $this->roles ) as $role ) {
+                       $this->role_objects[$role] = new WP_Role( $role, $this->roles[$role]['capabilities'] );
+                       $this->role_names[$role] = $this->roles[$role]['name'];
+               }
+       }
+
+       /**
+        * Reinitialize the object
+        *
+        * Recreates the role objects. This is typically called only by switch_to_blog()
+        * after switching wpdb to a new blog ID.
+        *
+        * @since 3.5.0
+        * @access public
+        */
+       function reinit() {
+               // There is no need to reinit if using the wp_user_roles global.
+               if ( ! $this->use_db )
+                       return;
+
+               global $wpdb, $wp_user_roles;
+
+               // Duplicated from _init() to avoid an extra function call.
+               $this->role_key = $wpdb->prefix . 'user_roles';
+               $this->roles = get_option( $this->role_key );
+               if ( empty( $this->roles ) )
+                       return;
+
+               $this->role_objects = array();
+               $this->role_names =  array();
+               foreach ( array_keys( $this->roles ) as $role ) {
                        $this->role_objects[$role] = new WP_Role( $role, $this->roles[$role]['capabilities'] );
                        $this->role_names[$role] = $this->roles[$role]['name'];
                }
@@ -123,13 +149,16 @@ class WP_Roles {
         *
         * 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.
-        * @return null|WP_Role WP_Role object if role is added, null if already exists.
+        * @param array $capabilities List of role capabilities in the above format.
+        * @return WP_Role|null WP_Role object if role is added, null if already exists.
         */
        function add_role( $role, $display_name, $capabilities = array() ) {
                if ( isset( $this->roles[$role] ) )
@@ -174,9 +203,12 @@ class WP_Roles {
         *
         * @param string $role Role name.
         * @param string $cap Capability name.
-        * @param bool $grant Optional, default is true. Whether role is capable of preforming capability.
+        * @param bool $grant Optional, default is true. Whether role is capable of performing capability.
         */
        function add_cap( $role, $cap, $grant = true ) {
+               if ( ! isset( $this->roles[$role] ) )
+                       return;
+
                $this->roles[$role]['capabilities'][$cap] = $grant;
                if ( $this->use_db )
                        update_option( $this->role_key, $this->roles );
@@ -192,6 +224,9 @@ class WP_Roles {
         * @param string $cap Capability name.
         */
        function remove_cap( $role, $cap ) {
+               if ( ! isset( $this->roles[$role] ) )
+                       return;
+
                unset( $this->roles[$role]['capabilities'][$cap] );
                if ( $this->use_db )
                        update_option( $this->role_key, $this->roles );
@@ -204,9 +239,9 @@ class WP_Roles {
         * @access public
         *
         * @param string $role Role name.
-        * @return object|null Null, if role does not exist. WP_Role object, if found.
+        * @return WP_Role|null WP_Role object if found, null if the role does not exist.
         */
-       function &get_role( $role ) {
+       function get_role( $role ) {
                if ( isset( $this->role_objects[$role] ) )
                        return $this->role_objects[$role];
                else
@@ -234,8 +269,7 @@ class WP_Roles {
         * @param string $role Role name to look up.
         * @return bool
         */
-       function is_role( $role )
-       {
+       function is_role( $role ) {
                return isset( $this->role_names[$role] );
        }
 }
@@ -267,19 +301,18 @@ class WP_Role {
        var $capabilities;
 
        /**
-        * PHP4 Constructor - Setup object properties.
+        * 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 or not.
+        * 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.
-        * @return WP_Role
         */
-       function WP_Role( $role, $capabilities ) {
+       function __construct( $role, $capabilities ) {
                $this->name = $role;
                $this->capabilities = $capabilities;
        }
@@ -362,8 +395,6 @@ class WP_User {
        /**
         * User data container.
         *
-        * This will be set as properties of the object.
-        *
         * @since 2.0.0
         * @access private
         * @var array
@@ -379,17 +410,6 @@ class WP_User {
         */
        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.
         *
@@ -427,84 +447,277 @@ class WP_User {
        var $allcaps = array();
 
        /**
-        * First name of the user.
+        * The filter context applied to user data fields.
         *
-        * Created to prevent notices.
-        *
-        * @since 2.7.0
-        * @access public
+        * @since 2.9.0
+        * @access private
         * @var string
         */
-       var $first_name = '';
+       var $filter = null;
 
-       /**
-        * Last name of the user.
-        *
-        * Created to prevent notices.
-        *
-        * @since 2.7.0
-        * @access public
-        * @var string
-        */
-       var $last_name = '';
+       private static $back_compat_keys;
 
        /**
-        * PHP4 Constructor - Sets up the object properties.
+        * Constructor
         *
-        * 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.
+        * Retrieves the userdata and passes it to {@link WP_User::init()}.
         *
         * @since 2.0.0
         * @access public
         *
-        * @param int|string $id User's ID or username
-        * @param int $name Optional. User's username
+        * @param int|string|stdClass|WP_User $id User's ID, a WP_User object, or a user object from the DB.
+        * @param string $name Optional. User's username
+        * @param int $blog_id Optional Blog ID, defaults to current blog.
         * @return WP_User
         */
-       function WP_User( $id, $name = '' ) {
+       function __construct( $id = 0, $name = '', $blog_id = '' ) {
+               if ( ! isset( self::$back_compat_keys ) ) {
+                       $prefix = $GLOBALS['wpdb']->prefix;
+                       self::$back_compat_keys = array(
+                               'user_firstname' => 'first_name',
+                               'user_lastname' => 'last_name',
+                               'user_description' => 'description',
+                               'user_level' => $prefix . 'user_level',
+                               $prefix . 'usersettings' => $prefix . 'user-settings',
+                               $prefix . 'usersettingstime' => $prefix . 'user-settings-time',
+                       );
+               }
 
-               if ( empty( $id ) && empty( $name ) )
+               if ( is_a( $id, 'WP_User' ) ) {
+                       $this->init( $id->data, $blog_id );
+                       return;
+               } elseif ( is_object( $id ) ) {
+                       $this->init( $id, $blog_id );
                        return;
+               }
 
-               if ( ! is_numeric( $id ) ) {
+               if ( ! empty( $id ) && ! is_numeric( $id ) ) {
                        $name = $id;
                        $id = 0;
                }
 
-               if ( ! empty( $id ) )
-                       $this->data = get_userdata( $id );
+               if ( $id )
+                       $data = self::get_data_by( 'id', $id );
                else
-                       $this->data = get_userdatabylogin( $name );
+                       $data = self::get_data_by( 'login', $name );
 
-               if ( empty( $this->data->ID ) )
-                       return;
+               if ( $data )
+                       $this->init( $data, $blog_id );
+       }
+
+       /**
+        * Sets up object properties, including capabilities.
+        *
+        * @param object $data User DB row object
+        * @param int $blog_id Optional. The blog id to initialize for
+        */
+       function init( $data, $blog_id = '' ) {
+               $this->data = $data;
+               $this->ID = (int) $data->ID;
+
+               $this->for_blog( $blog_id );
+       }
+
+       /**
+        * Return only the main user fields
+        *
+        * @since 3.3.0
+        *
+        * @param string $field The field to query against: 'id', 'slug', 'email' or 'login'
+        * @param string|int $value The field value
+        * @return object Raw user object
+        */
+       static function get_data_by( $field, $value ) {
+               global $wpdb;
+
+               if ( 'id' == $field ) {
+                       // Make sure the value is numeric to avoid casting objects, for example,
+                       // to int 1.
+                       if ( ! is_numeric( $value ) )
+                               return false;
+                       $value = intval( $value );
+                       if ( $value < 1 )
+                               return false;
+               } else {
+                       $value = trim( $value );
+               }
+
+               if ( !$value )
+                       return false;
+
+               switch ( $field ) {
+                       case 'id':
+                               $user_id = $value;
+                               $db_field = 'ID';
+                               break;
+                       case 'slug':
+                               $user_id = wp_cache_get($value, 'userslugs');
+                               $db_field = 'user_nicename';
+                               break;
+                       case 'email':
+                               $user_id = wp_cache_get($value, 'useremail');
+                               $db_field = 'user_email';
+                               break;
+                       case 'login':
+                               $value = sanitize_user( $value );
+                               $user_id = wp_cache_get($value, 'userlogins');
+                               $db_field = 'user_login';
+                               break;
+                       default:
+                               return false;
+               }
+
+               if ( false !== $user_id ) {
+                       if ( $user = wp_cache_get( $user_id, 'users' ) )
+                               return $user;
+               }
+
+               if ( !$user = $wpdb->get_row( $wpdb->prepare(
+                       "SELECT * FROM $wpdb->users WHERE $db_field = %s", $value
+               ) ) )
+                       return false;
+
+               update_user_caches( $user );
+
+               return $user;
+       }
+
+       /**
+        * Magic method for checking the existence of a certain custom field
+        *
+        * @since 3.3.0
+        */
+       function __isset( $key ) {
+               if ( 'id' == $key ) {
+                       _deprecated_argument( 'WP_User->id', '2.1', __( 'Use <code>WP_User->ID</code> instead.' ) );
+                       $key = 'ID';
+               }
+
+               if ( isset( $this->data->$key ) )
+                       return true;
+
+               if ( isset( self::$back_compat_keys[ $key ] ) )
+                       $key = self::$back_compat_keys[ $key ];
+
+               return metadata_exists( 'user', $this->ID, $key );
+       }
+
+       /**
+        * Magic method for accessing custom fields
+        *
+        * @since 3.3.0
+        */
+       function __get( $key ) {
+               if ( 'id' == $key ) {
+                       _deprecated_argument( 'WP_User->id', '2.1', __( 'Use <code>WP_User->ID</code> instead.' ) );
+                       return $this->ID;
+               }
+
+               if ( isset( $this->data->$key ) ) {
+                       $value = $this->data->$key;
+               } else {
+                       if ( isset( self::$back_compat_keys[ $key ] ) )
+                               $key = self::$back_compat_keys[ $key ];
+                       $value = get_user_meta( $this->ID, $key, true );
+               }
+
+               if ( $this->filter ) {
+                       $value = sanitize_user_field( $key, $value, $this->ID, $this->filter );
+               }
+
+               return $value;
+       }
 
-               foreach ( get_object_vars( $this->data ) as $key => $value ) {
-                       $this->{$key} = $value;
+       /**
+        * Magic method for setting custom fields
+        *
+        * @since 3.3.0
+        */
+       function __set( $key, $value ) {
+               if ( 'id' == $key ) {
+                       _deprecated_argument( 'WP_User->id', '2.1', __( 'Use <code>WP_User->ID</code> instead.' ) );
+                       $this->ID = $value;
+                       return;
                }
 
-               $this->id = $this->ID;
-               $this->_init_caps();
+               $this->data->$key = $value;
+       }
+
+       /**
+        * Determine whether the user exists in the database.
+        *
+        * @since 3.4.0
+        * @access public
+        *
+        * @return bool True if user exists in the database, false if not.
+        */
+       function exists() {
+               return ! empty( $this->ID );
+       }
+
+       /**
+        * Retrieve the value of a property or meta key.
+        *
+        * Retrieves from the users and usermeta table.
+        *
+        * @since 3.3.0
+        *
+        * @param string $key Property
+        */
+       function get( $key ) {
+               return $this->__get( $key );
+       }
+
+       /**
+        * Determine whether a property or meta key is set
+        *
+        * Consults the users and usermeta tables.
+        *
+        * @since 3.3.0
+        *
+        * @param string $key Property
+        */
+       function has_prop( $key ) {
+               return $this->__isset( $key );
+       }
+
+       /*
+        * Return an array representation.
+        *
+        * @since 3.5.0
+        *
+        * @return array Array representation.
+        */
+       function to_array() {
+               return get_object_vars( $this->data );
        }
 
        /**
-        * Setup capability object properties.
+        * 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
         * @access protected
+        * @since 2.1.0
+        *
+        * @param string $cap_key Optional capability key
         */
-       function _init_caps() {
+       function _init_caps( $cap_key = '' ) {
                global $wpdb;
-               $this->cap_key = $wpdb->prefix . 'capabilities';
-               $this->caps = &$this->{$this->cap_key};
+
+               if ( empty($cap_key) )
+                       $this->cap_key = $wpdb->prefix . 'capabilities';
+               else
+                       $this->cap_key = $cap_key;
+
+               $this->caps = get_user_meta( $this->ID, $this->cap_key, true );
+
                if ( ! is_array( $this->caps ) )
                        $this->caps = array();
+
                $this->get_role_caps();
        }
 
@@ -528,13 +741,13 @@ class WP_User {
 
                //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' ) );
+                       $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 ) {
-                       $role =& $wp_roles->get_role( $role );
-                       $this->allcaps = array_merge( (array) $this->allcaps, (array) $role->capabilities );
+                       $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 );
        }
@@ -551,7 +764,7 @@ class WP_User {
         */
        function add_role( $role ) {
                $this->caps[$role] = true;
-               update_usermeta( $this->ID, $this->cap_key, $this->caps );
+               update_user_meta( $this->ID, $this->cap_key, $this->caps );
                $this->get_role_caps();
                $this->update_user_level_from_caps();
        }
@@ -565,11 +778,12 @@ class WP_User {
         * @param string $role Role name.
         */
        function remove_role( $role ) {
-               if ( empty( $this->roles[$role] ) || ( count( $this->roles ) <= 1 ) )
+               if ( !in_array($role, $this->roles) )
                        return;
                unset( $this->caps[$role] );
-               update_usermeta( $this->ID, $this->cap_key, $this->caps );
+               update_user_meta( $this->ID, $this->cap_key, $this->caps );
                $this->get_role_caps();
+               $this->update_user_level_from_caps();
        }
 
        /**
@@ -585,17 +799,23 @@ class WP_User {
         * @param string $role Role name.
         */
        function set_role( $role ) {
+               if ( 1 == count( $this->roles ) && $role == current( $this->roles ) )
+                       return;
+
                foreach ( (array) $this->roles as $oldrole )
                        unset( $this->caps[$oldrole] );
+
+               $old_roles = $this->roles;
                if ( !empty( $role ) ) {
                        $this->caps[$role] = true;
                        $this->roles = array( $role => true );
                } else {
                        $this->roles = false;
                }
-               update_usermeta( $this->ID, $this->cap_key, $this->caps );
+               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, $old_roles );
        }
 
        /**
@@ -638,8 +858,8 @@ class WP_User {
         */
        function update_user_level_from_caps() {
                global $wpdb;
-               $this->user_level = array_reduce( array_keys( $this->allcaps ), array( &$this, 'level_reduction' ), 0 );
-               update_usermeta( $this->ID, $wpdb->prefix.'user_level', $this->user_level );
+               $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 );
        }
 
        /**
@@ -653,7 +873,7 @@ class WP_User {
         */
        function add_cap( $cap, $grant = true ) {
                $this->caps[$cap] = $grant;
-               update_usermeta( $this->ID, $this->cap_key, $this->caps );
+               update_user_meta( $this->ID, $this->cap_key, $this->caps );
        }
 
        /**
@@ -665,9 +885,10 @@ class WP_User {
         * @param string $cap Capability name.
         */
        function remove_cap( $cap ) {
-               if ( empty( $this->caps[$cap] ) ) return;
+               if ( ! isset( $this->caps[$cap] ) )
+                       return;
                unset( $this->caps[$cap] );
-               update_usermeta( $this->ID, $this->cap_key, $this->caps );
+               update_user_meta( $this->ID, $this->cap_key, $this->caps );
        }
 
        /**
@@ -679,8 +900,8 @@ class WP_User {
        function remove_all_caps() {
                global $wpdb;
                $this->caps = array();
-               update_usermeta( $this->ID, $this->cap_key, '' );
-               update_usermeta( $this->ID, $wpdb->prefix.'user_level', '' );
+               delete_user_meta( $this->ID, $this->cap_key );
+               delete_user_meta( $this->ID, $wpdb->prefix . 'user_level' );
                $this->get_role_caps();
        }
 
@@ -689,27 +910,36 @@ class WP_User {
         *
         * 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.
+        * check for capabilities against a specific object, such as a post or user.
         *
         * @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 ) )
+               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] )
+                       if ( empty( $capabilities[ $cap ] ) )
                                return false;
                }
 
@@ -731,6 +961,21 @@ class WP_User {
                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 );
+       }
 }
 
 /**
@@ -738,8 +983,8 @@ class WP_User {
  *
  * 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', 'delete_post', 'delete_page', 'edit_post',
- * 'edit_page', 'read_post', or 'read_page'.
+ * 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
  *
@@ -752,161 +997,271 @@ function map_meta_cap( $cap, $user_id ) {
        $caps = array();
 
        switch ( $cap ) {
-       case 'delete_user':
-               $caps[] = 'delete_users';
+       case 'remove_user':
+               $caps[] = 'remove_users';
+               break;
+       case 'promote_user':
+               $caps[] = 'promote_users';
                break;
        case 'edit_user':
-               if ( !isset( $args[0] ) || $user_id != $args[0] ) {
-                       $caps[] = 'edit_users';
-               }
+       case 'edit_users':
+               // Allow user to edit itself
+               if ( 'edit_user' == $cap && isset( $args[0] ) && $user_id == $args[0] )
+                       break;
+
+               // 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'; // edit_user maps to edit_users.
                break;
        case 'delete_post':
-               $author_data = get_userdata( $user_id );
-               //echo "post ID: {$args[0]}<br />";
+       case 'delete_page':
                $post = get_post( $args[0] );
-               if ( 'page' == $post->post_type ) {
-                       $args = array_merge( array( 'delete_page', $user_id ), $args );
-                       return call_user_func_array( 'map_meta_cap', $args );
+
+               if ( 'revision' == $post->post_type ) {
+                       $post = get_post( $post->post_parent );
                }
-               $post_author_data = get_userdata( $post->post_author );
-               //echo "current user id : $user_id, post author id: " . $post_author_data->ID . "<br />";
+
+               $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;
+               }
+
+               $post_author_id = $post->post_author;
+
+               // If no author set yet, default to current user for cap checks.
+               if ( ! $post_author_id )
+                       $post_author_id = $user_id;
+
+               $post_author_data = $post_author_id == get_current_user_id() ? wp_get_current_user() : get_userdata( $post_author_id );
+
                // If the user is the author...
-               if ( $user_id == $post_author_data->ID ) {
+               if ( is_object( $post_author_data ) && $user_id == $post_author_data->ID ) {
                        // If the post is published...
-                       if ( 'publish' == $post->post_status )
-                               $caps[] = 'delete_published_posts';
-                       else
+                       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[] = 'delete_posts';
+                               $caps[] = $post_type->cap->delete_posts;
+                       }
                } else {
                        // The user is trying to edit someone else's post.
-                       $caps[] = 'delete_others_posts';
+                       $caps[] = $post_type->cap->delete_others_posts;
                        // The post is published, extra cap required.
                        if ( 'publish' == $post->post_status )
-                               $caps[] = 'delete_published_posts';
+                               $caps[] = $post_type->cap->delete_published_posts;
                        elseif ( 'private' == $post->post_status )
-                               $caps[] = 'delete_private_posts';
-               }
-               break;
-       case 'delete_page':
-               $author_data = get_userdata( $user_id );
-               //echo "post ID: {$args[0]}<br />";
-               $page = get_page( $args[0] );
-               $page_author_data = get_userdata( $page->post_author );
-               //echo "current user id : $user_id, page author id: " . $page_author_data->ID . "<br />";
-               // If the user is the author...
-               if ( $user_id == $page_author_data->ID ) {
-                       // If the page is published...
-                       if ( $page->post_status == 'publish' )
-                               $caps[] = 'delete_published_pages';
-                       else
-                               // If the page is draft...
-                               $caps[] = 'delete_pages';
-               } else {
-                       // The user is trying to edit someone else's page.
-                       $caps[] = 'delete_others_pages';
-                       // The page is published, extra cap required.
-                       if ( $page->post_status == 'publish' )
-                               $caps[] = 'delete_published_pages';
-                       elseif ( $page->post_status == 'private' )
-                               $caps[] = 'delete_private_pages';
+                               $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':
-               $author_data = get_userdata( $user_id );
-               //echo "post ID: {$args[0]}<br />";
+       case 'edit_page':
                $post = get_post( $args[0] );
-               if ( 'page' == $post->post_type ) {
-                       $args = array_merge( array( 'edit_page', $user_id ), $args );
-                       return call_user_func_array( 'map_meta_cap', $args );
+
+               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;
                }
-               $post_author_data = get_userdata( $post->post_author );
-               //echo "current user id : $user_id, post author id: " . $post_author_data->ID . "<br />";
+
+               $post_author_id = $post->post_author;
+
+               // If no author set yet, default to current user for cap checks.
+               if ( ! $post_author_id )
+                       $post_author_id = $user_id;
+
+               $post_author_data = $post_author_id == get_current_user_id() ? wp_get_current_user() : get_userdata( $post_author_id );
+
                // If the user is the author...
-               if ( $user_id == $post_author_data->ID ) {
+               if ( is_object( $post_author_data ) && $user_id == $post_author_data->ID ) {
                        // If the post is published...
-                       if ( 'publish' == $post->post_status )
-                               $caps[] = 'edit_published_posts';
-                       else
+                       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[] = 'edit_posts';
+                               $caps[] = $post_type->cap->edit_posts;
+                       }
                } else {
                        // The user is trying to edit someone else's post.
-                       $caps[] = 'edit_others_posts';
+                       $caps[] = $post_type->cap->edit_others_posts;
                        // The post is published, extra cap required.
                        if ( 'publish' == $post->post_status )
-                               $caps[] = 'edit_published_posts';
+                               $caps[] = $post_type->cap->edit_published_posts;
                        elseif ( 'private' == $post->post_status )
-                               $caps[] = 'edit_private_posts';
-               }
-               break;
-       case 'edit_page':
-               $author_data = get_userdata( $user_id );
-               //echo "post ID: {$args[0]}<br />";
-               $page = get_page( $args[0] );
-               $page_author_data = get_userdata( $page->post_author );
-               //echo "current user id : $user_id, page author id: " . $page_author_data->ID . "<br />";
-               // If the user is the author...
-               if ( $user_id == $page_author_data->ID ) {
-                       // If the page is published...
-                       if ( 'publish' == $page->post_status )
-                               $caps[] = 'edit_published_pages';
-                       else
-                               // If the page is draft...
-                               $caps[] = 'edit_pages';
-               } else {
-                       // The user is trying to edit someone else's page.
-                       $caps[] = 'edit_others_pages';
-                       // The page is published, extra cap required.
-                       if ( 'publish' == $page->post_status )
-                               $caps[] = 'edit_published_pages';
-                       elseif ( 'private' == $page->post_status )
-                               $caps[] = 'edit_private_pages';
+                               $caps[] = $post_type->cap->edit_private_posts;
                }
                break;
        case 'read_post':
+       case 'read_page':
                $post = get_post( $args[0] );
-               if ( 'page' == $post->post_type ) {
-                       $args = array_merge( array( 'read_page', $user_id ), $args );
-                       return call_user_func_array( 'map_meta_cap', $args );
+
+               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[] = 'read';
+               $status_obj = get_post_status_object( $post->post_status );
+               if ( $status_obj->public ) {
+                       $caps[] = $post_type->cap->read;
                        break;
                }
 
-               $author_data = get_userdata( $user_id );
-               $post_author_data = get_userdata( $post->post_author );
-               if ( $user_id == $post_author_data->ID )
-                       $caps[] = 'read';
+               $post_author_id = $post->post_author;
+
+               // If no author set yet, default to current user for cap checks.
+               if ( ! $post_author_id )
+                       $post_author_id = $user_id;
+
+               $post_author_data = $post_author_id == get_current_user_id() ? wp_get_current_user() : get_userdata( $post_author_id );
+
+               if ( is_object( $post_author_data ) && $user_id == $post_author_data->ID )
+                       $caps[] = $post_type->cap->read;
+               elseif ( $status_obj->private )
+                       $caps[] = $post_type->cap->read_private_posts;
                else
-                       $caps[] = 'read_private_posts';
+                       $caps = map_meta_cap( 'edit_post', $user_id, $post->ID );
                break;
-       case 'read_page':
-               $page = get_page( $args[0] );
+       case 'publish_post':
+               $post = get_post( $args[0] );
+               $post_type = get_post_type_object( $post->post_type );
 
-               if ( 'private' != $page->post_status ) {
-                       $caps[] = 'read';
-                       break;
-               }
+               $caps[] = $post_type->cap->publish_posts;
+               break;
+       case 'edit_post_meta':
+       case 'delete_post_meta':
+       case 'add_post_meta':
+               $post = get_post( $args[0] );
+               $caps = map_meta_cap( 'edit_post', $user_id, $post->ID );
 
-               $author_data = get_userdata( $user_id );
-               $page_author_data = get_userdata( $page->post_author );
-               if ( $user_id == $page_author_data->ID )
-                       $caps[] = 'read';
-               else
-                       $caps[] = 'read_private_pages';
+               $meta_key = isset( $args[ 1 ] ) ? $args[ 1 ] : false;
+
+               if ( $meta_key && has_filter( "auth_post_meta_{$meta_key}" ) ) {
+                       $allowed = apply_filters( "auth_post_meta_{$meta_key}", false, $meta_key, $post->ID, $user_id, $cap, $caps );
+                       if ( ! $allowed )
+                               $caps[] = $cap;
+               } elseif ( $meta_key && is_protected_meta( $meta_key, 'post' ) ) {
+                       $caps[] = $cap;
+               }
+               break;
+       case 'edit_comment':
+               $comment = get_comment( $args[0] );
+               $post = get_post( $comment->comment_post_ID );
+               $caps = map_meta_cap( 'edit_post', $user_id, $post->ID );
                break;
        case 'unfiltered_upload':
-               if ( defined('ALLOW_UNFILTERED_UPLOADS') && ALLOW_UNFILTERED_UPLOADS == true )
+               if ( defined('ALLOW_UNFILTERED_UPLOADS') && ALLOW_UNFILTERED_UPLOADS && ( !is_multisite() || is_super_admin( $user_id ) )  )
+                       $caps[] = $cap;
+               else
+                       $caps[] = 'do_not_allow';
+               break;
+       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';
+               elseif ( is_multisite() && ! is_super_admin( $user_id ) )
+                       $caps[] = 'do_not_allow';
+               else
+                       $caps[] = $cap;
+               break;
+       case 'edit_files':
+       case 'edit_plugins':
+       case 'edit_themes':
+               // Disallow the file editors.
+               if ( defined( 'DISALLOW_FILE_EDIT' ) && DISALLOW_FILE_EDIT )
+                       $caps[] = 'do_not_allow';
+               elseif ( defined( 'DISALLOW_FILE_MODS' ) && DISALLOW_FILE_MODS )
+                       $caps[] = 'do_not_allow';
+               elseif ( is_multisite() && ! is_super_admin( $user_id ) )
+                       $caps[] = 'do_not_allow';
+               else
+                       $caps[] = $cap;
+               break;
+       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 updates core, plugin, or theme files.
+               // Files in uploads are excepted.
+               if ( defined( 'DISALLOW_FILE_MODS' ) && DISALLOW_FILE_MODS )
+                       $caps[] = 'do_not_allow';
+               elseif ( is_multisite() && ! is_super_admin( $user_id ) )
+                       $caps[] = 'do_not_allow';
+               else
+                       $caps[] = $cap;
+               break;
+       case 'activate_plugins':
+               $caps[] = $cap;
+               if ( is_multisite() ) {
+                       // update_, install_, and delete_ are handled above with is_super_admin().
+                       $menu_perms = get_site_option( 'menu_items', array() );
+                       if ( empty( $menu_perms['plugins'] ) )
+                               $caps[] = 'manage_network_plugins';
+               }
+               break;
+       case 'delete_user':
+       case 'delete_users':
+               // If multisite only super admins can delete users.
+               if ( is_multisite() && ! is_super_admin( $user_id ) )
+                       $caps[] = 'do_not_allow';
+               else
+                       $caps[] = 'delete_users'; // delete_user maps to delete_users.
+               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;
+       case 'manage_links' :
+               if ( get_option( 'link_manager_enabled' ) )
                        $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;
        }
@@ -931,7 +1286,82 @@ function current_user_can( $capability ) {
        $args = array_slice( func_get_args(), 1 );
        $args = array_merge( array( $capability ), $args );
 
-       return call_user_func_array( array( &$current_user, 'has_cap' ), $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 ) {
+       if ( is_multisite() )
+               switch_to_blog( $blog_id );
+
+       $current_user = wp_get_current_user();
+
+       if ( empty( $current_user ) )
+               return false;
+
+       $args = array_slice( func_get_args(), 2 );
+       $args = array_merge( array( $capability ), $args );
+
+       $can = call_user_func_array( array( $current_user, 'has_cap' ), $args );
+
+       if ( is_multisite() )
+               restore_current_blog();
+
+       return $can;
+}
+
+/**
+ * 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 = get_userdata( $post->post_author );
+
+       if ( ! $author )
+               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 = get_userdata( $user );
+
+       if ( ! $user || ! $user->exists() )
+               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 );
 }
 
 /**
@@ -941,7 +1371,7 @@ function current_user_can( $capability ) {
  * @since 2.0.0
  *
  * @param string $role Role name.
- * @return object
+ * @return WP_Role|null WP_Role object if found, null if the role does not exist.
  */
 function get_role( $role ) {
        global $wp_roles;
@@ -960,8 +1390,8 @@ function get_role( $role ) {
  *
  * @param string $role Role name.
  * @param string $display_name Display name for role.
- * @param array $capabilities List of capabilities.
- * @return null|WP_Role WP_Role object if role is added, null if already exists.
+ * @param array $capabilities List of capabilities, e.g. array( 'edit_posts' => true, 'delete_posts' => false );
+ * @return WP_Role|null WP_Role object if role is added, null if already exists.
  */
 function add_role( $role, $display_name, $capabilities = array() ) {
        global $wp_roles;
@@ -990,4 +1420,49 @@ function remove_role( $role ) {
        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_id == get_current_user_id() )
+               $user = wp_get_current_user();
+       else
+               $user = get_userdata( $user_id );
+
+       if ( ! $user || ! $user->exists() )
+               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;
+}