WordPress 4.4
[autoinstalls/wordpress.git] / wp-includes / capabilities.php
index 85eaa7735eb696f89e4cc0df71a415fb0eee3e60..7c570c4a1ddfb5a502bb8582c6a3f7c7683e51fc 100644 (file)
 <?php
+/**
+ * Core User Role & Capabilities API
+ *
+ * @package WordPress
+ * @subpackage Users
+ */
+
+/**
+ * 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.
+ * @param int    $object_id Optional. ID of the specific object to check against if `$cap` is a "meta" cap.
+ *                          "Meta" capabilities, e.g. 'edit_post', 'edit_user', etc., are capabilities used
+ *                          by map_meta_cap() to map to other "primitive" capabilities, e.g. 'edit_posts',
+ *                          'edit_others_posts', etc. The parameter is accessed via func_get_args().
+ * @return array Actual capabilities for meta capability.
+ */
+function map_meta_cap( $cap, $user_id ) {
+       $args = array_slice( func_get_args(), 2 );
+       $caps = array();
 
-class WP_Roles {
-       var $roles;
-
-       var $role_objects = array();
-       var $role_names = array();
-       var $role_key;
-       var $use_db = true;
-
-       function WP_Roles() {
-               $this->_init();
-       }
+       switch ( $cap ) {
+       case 'remove_user':
+               $caps[] = 'remove_users';
+               break;
+       case 'promote_user':
+       case 'add_users':
+               $caps[] = 'promote_users';
+               break;
+       case 'edit_user':
+       case 'edit_users':
+               // Allow user to edit itself
+               if ( 'edit_user' == $cap && isset( $args[0] ) && $user_id == $args[0] )
+                       break;
 
-       function _init () {
-               global $wpdb;
-               global $wp_user_roles;
-               $this->role_key = $wpdb->prefix . 'user_roles';
-               if ( ! empty($wp_user_roles) ) {
-                       $this->roles = $wp_user_roles;
-                       $this->use_db = false;
+               // In multisite the user must have manage_network_users caps. If editing a super admin, the user must be a super admin.
+               if ( is_multisite() && ( ( ! is_super_admin( $user_id ) && 'edit_user' === $cap && is_super_admin( $args[0] ) ) || ! user_can( $user_id, 'manage_network_users' ) ) ) {
+                       $caps[] = 'do_not_allow';
                } else {
-                       $this->roles = get_option($this->role_key);
+                       $caps[] = 'edit_users'; // edit_user maps to edit_users.
                }
-
-               if ( empty($this->roles) )
-                       return;
-
-               $this->role_objects = array();
-               $this->role_names =  array();
-               foreach ($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'];
+               break;
+       case 'delete_post':
+       case 'delete_page':
+               $post = get_post( $args[0] );
+               if ( ! $post ) {
+                       $caps[] = 'do_not_allow';
+                       break;
                }
-       }
-
-       function add_role($role, $display_name, $capabilities = '') {
-               if ( isset($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];
-       }
-
-       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, $this->roles);
-       }
-
-       function add_cap($role, $cap, $grant = true) {
-               $this->roles[$role]['capabilities'][$cap] = $grant;
-               if ( $this->use_db )
-                       update_option($this->role_key, $this->roles);
-       }
-
-       function remove_cap($role, $cap) {
-               unset($this->roles[$role]['capabilities'][$cap]);
-               if ( $this->use_db )
-                       update_option($this->role_key, $this->roles);
-       }
-
-       function &get_role($role) {
-               if ( isset($this->role_objects[$role]) )
-                       return $this->role_objects[$role];
-               else
-                       return null;
-       }
-
-       function get_names() {
-               return $this->role_names;
-       }
-
-       function is_role($role)
-       {
-               return isset($this->role_names[$role]);
-       }
-}
-
-class WP_Role {
-       var $name;
-       var $capabilities;
-
-       function WP_Role($role, $capabilities) {
-               $this->name = $role;
-               $this->capabilities = $capabilities;
-       }
-
-       function add_cap($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, $grant);
-       }
-
-       function remove_cap($cap) {
-               global $wp_roles;
-
-               if ( ! isset($wp_roles) )
-                       $wp_roles = new WP_Roles();
-
-               unset($this->capabilities[$cap]);
-               $wp_roles->remove_cap($this->name, $cap);
-       }
-
-       function has_cap($cap) {
-               $capabilities = apply_filters('role_has_cap', $this->capabilities, $cap, $this->name);
-               if ( !empty($capabilities[$cap]) )
-                       return $capabilities[$cap];
-               else
-                       return false;
-       }
-
-}
-
-class WP_User {
-       var $data;
-       var $ID = 0;
-       var $id = 0; // Deprecated, use $ID instead.
-       var $caps = array();
-       var $cap_key;
-       var $roles = array();
-       var $allcaps = array();
-
-       function WP_User($id, $name = '') {
 
-               if ( empty($id) && empty($name) )
-                       return;
-
-               if ( ! is_numeric($id) ) {
-                       $name = $id;
-                       $id = 0;
+               if ( 'revision' == $post->post_type ) {
+                       $post = get_post( $post->post_parent );
+                       if ( ! $post ) {
+                               $caps[] = 'do_not_allow';
+                               break;
+                       }
                }
 
-               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;
+               $post_type = get_post_type_object( $post->post_type );
+               if ( ! $post_type ) {
+                       /* translators: 1: post type, 2: capability name */
+                       _doing_it_wrong( __FUNCTION__, sprintf( __( 'The post type %1$s is not registered, so it may not be reliable to check the capability "%2$s" against a post of that type.' ), $post->post_type, $cap ), '4.4.0' );
+                       $caps[] = 'edit_others_posts';
+                       break;
                }
 
-               $this->id = $this->ID;
-               $this->_init_caps();
-       }
-
-       function _init_caps() {
-               global $wpdb;
-               $this->cap_key = $wpdb->prefix . 'capabilities';
-               $this->caps = &$this->{$this->cap_key};
-               if ( ! is_array($this->caps) )
-                       $this->caps = array();
-               $this->get_role_caps();
-       }
-
-       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) {
-                       $role = $wp_roles->get_role($role);
-                       $this->allcaps = array_merge($this->allcaps, $role->capabilities);
+               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;
                }
-               $this->allcaps = array_merge($this->allcaps, $this->caps);
-       }
-
-       function add_role($role) {
-               $this->caps[$role] = true;
-               update_usermeta($this->ID, $this->cap_key, $this->caps);
-               $this->get_role_caps();
-               $this->update_user_level_from_caps();
-       }
-
-       function remove_role($role) {
-               if ( empty($this->roles[$role]) || (count($this->roles) <= 1) )
-                       return;
-               unset($this->caps[$role]);
-               update_usermeta($this->ID, $this->cap_key, $this->caps);
-               $this->get_role_caps();
-       }
 
-       function set_role($role) {
-               foreach($this->roles as $oldrole)
-                       unset($this->caps[$oldrole]);
-               if ( !empty($role) ) {
-                       $this->caps[$role] = true;
-                       $this->roles = array($role => true);
+               // If the post author is set and the user is the author...
+               if ( $post->post_author && $user_id == $post->post_author ) {
+                       // If the post is published or scheduled...
+                       if ( in_array( $post->post_status, array( 'publish', 'future' ), true ) ) {
+                               $caps[] = $post_type->cap->delete_published_posts;
+                       } elseif ( 'trash' == $post->post_status ) {
+                               $status = get_post_meta( $post->ID, '_wp_trash_meta_status', true );
+                               if ( in_array( $status, array( 'publish', 'future' ), true ) ) {
+                                       $caps[] = $post_type->cap->delete_published_posts;
+                               } else {
+                                       $caps[] = $post_type->cap->delete_posts;
+                               }
+                       } else {
+                               // If the post is draft...
+                               $caps[] = $post_type->cap->delete_posts;
+                       }
                } else {
-                       $this->roles = false;
+                       // The user is trying to edit someone else's post.
+                       $caps[] = $post_type->cap->delete_others_posts;
+                       // The post is published or scheduled, extra cap required.
+                       if ( in_array( $post->post_status, array( 'publish', 'future' ), true ) ) {
+                               $caps[] = $post_type->cap->delete_published_posts;
+                       } elseif ( 'private' == $post->post_status ) {
+                               $caps[] = $post_type->cap->delete_private_posts;
+                       }
                }
-               update_usermeta($this->ID, $this->cap_key, $this->caps);
-               $this->get_role_caps();
-               $this->update_user_level_from_caps();
-       }
-
-       function level_reduction($max, $item) {
-               if(preg_match('/^level_(10|[0-9])$/i', $item, $matches)) {
-                       $level = intval($matches[1]);
-                       return max($max, $level);
-               } else {
-                       return $max;
+               break;
+               // edit_post breaks down to edit_posts, edit_published_posts, or
+               // edit_others_posts
+       case 'edit_post':
+       case 'edit_page':
+               $post = get_post( $args[0] );
+               if ( ! $post ) {
+                       $caps[] = 'do_not_allow';
+                       break;
                }
-       }
 
-       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', $this->user_level);
-       }
-
-       function add_cap($cap, $grant = true) {
-               $this->caps[$cap] = $grant;
-               update_usermeta($this->ID, $this->cap_key, $this->caps);
-       }
-
-       function remove_cap($cap) {
-               if ( empty($this->caps[$cap]) ) return;
-               unset($this->caps[$cap]);
-               update_usermeta($this->ID, $this->cap_key, $this->caps);
-       }
-
-       function remove_all_caps() {
-               global $wpdb;
-               $this->caps = array();
-               update_usermeta($this->ID, $this->cap_key, '');
-               update_usermeta($this->ID, $wpdb->prefix.'user_level', '');
-               $this->get_role_caps();
-       }
-
-       //has_cap(capability_or_role_name) or
-       //has_cap('edit_post', post_id)
-       function has_cap($cap) {
-               if ( is_numeric($cap) )
-                       $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);
-               // Must have ALL requested caps
-               $capabilities = apply_filters('user_has_cap', $this->allcaps, $caps, $args);
-               foreach ($caps as $cap) {
-                       //echo "Checking cap $cap<br />";
-                       if(empty($capabilities[$cap]) || !$capabilities[$cap])
-                               return false;
+               if ( 'revision' == $post->post_type ) {
+                       $post = get_post( $post->post_parent );
+                       if ( ! $post ) {
+                               $caps[] = 'do_not_allow';
+                               break;
+                       }
                }
 
-               return true;
-       }
-
-       function translate_level_to_cap($level) {
-               return 'level_' . $level;
-       }
-
-}
-
-// Map meta capabilities to primitive capabilities.
-function map_meta_cap($cap, $user_id) {
-       $args = array_slice(func_get_args(), 2);
-       $caps = array();
-
-       switch ($cap) {
-       case 'delete_user':
-               $caps[] = 'delete_users';
-               break;
-       case 'edit_user':
-               if ( !isset($args[0]) || $user_id != $args[0] ) {
-                       $caps[] = 'edit_users';
+               $post_type = get_post_type_object( $post->post_type );
+               if ( ! $post_type ) {
+                       /* translators: 1: post type, 2: capability name */
+                       _doing_it_wrong( __FUNCTION__, sprintf( __( 'The post type %1$s is not registered, so it may not be reliable to check the capability "%2$s" against a post of that type.' ), $post->post_type, $cap ), '4.4.0' );
+                       $caps[] = 'edit_others_posts';
+                       break;
                }
-               break;
-       case 'delete_post':
-               $author_data = get_userdata($user_id);
-               //echo "post ID: {$args[0]}<br />";
-               $post = get_post($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 ( ! $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: " . $post_author_data->ID . "<br />";
-               // If the user is the author...
-               if ($user_id == $post_author_data->ID) {
-                       // If the post is published...
-                       if ($post->post_status == 'publish')
-                               $caps[] = 'delete_published_posts';
-                       else
+
+               // If the post author is set and the user is the author...
+               if ( $post->post_author && $user_id == $post->post_author ) {
+                       // If the post is published or scheduled...
+                       if ( in_array( $post->post_status, array( 'publish', 'future' ), true ) ) {
+                               $caps[] = $post_type->cap->edit_published_posts;
+                       } elseif ( 'trash' == $post->post_status ) {
+                               $status = get_post_meta( $post->ID, '_wp_trash_meta_status', true );
+                               if ( in_array( $status, array( 'publish', 'future' ), true ) ) {
+                                       $caps[] = $post_type->cap->edit_published_posts;
+                               } else {
+                                       $caps[] = $post_type->cap->edit_posts;
+                               }
+                       } else {
                                // If the post is draft...
-                               $caps[] = 'delete_posts';
+                               $caps[] = $post_type->cap->edit_posts;
+                       }
                } else {
                        // The user is trying to edit someone else's post.
-                       $caps[] = 'delete_others_posts';
-                       // The post is published, extra cap required.
-                       if ($post->post_status == 'publish')
-                               $caps[] = 'delete_published_posts';
-                       else if ($post->post_status == 'private')
-                               $caps[] = 'delete_private_posts';
+                       $caps[] = $post_type->cap->edit_others_posts;
+                       // The post is published or scheduled, extra cap required.
+                       if ( in_array( $post->post_status, array( 'publish', 'future' ), true ) ) {
+                               $caps[] = $post_type->cap->edit_published_posts;
+                       } elseif ( 'private' == $post->post_status ) {
+                               $caps[] = $post_type->cap->edit_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')
-                               $caps[] = 'delete_published_pages';
-                       else if ($page->post_status == 'private')
-                               $caps[] = 'delete_private_pages';
+       case 'read_post':
+       case 'read_page':
+               $post = get_post( $args[0] );
+               if ( ! $post ) {
+                       $caps[] = 'do_not_allow';
+                       break;
                }
-               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 />";
-               $post = get_post($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 );
+                       if ( ! $post ) {
+                               $caps[] = 'do_not_allow';
+                               break;
+                       }
                }
-               $post_author_data = get_userdata($post->post_author);
-               //echo "current user id : $user_id, post author id: " . $post_author_data->ID . "<br />";
-               // If the user is the author...
-               if ($user_id == $post_author_data->ID) {
-                       // If the post is published...
-                       if ($post->post_status == 'publish')
-                               $caps[] = 'edit_published_posts';
-                       else
-                               // If the post is draft...
-                               $caps[] = 'edit_posts';
-               } else {
-                       // The user is trying to edit someone else's post.
+
+               $post_type = get_post_type_object( $post->post_type );
+               if ( ! $post_type ) {
+                       /* translators: 1: post type, 2: capability name */
+                       _doing_it_wrong( __FUNCTION__, sprintf( __( 'The post type %1$s is not registered, so it may not be reliable to check the capability "%2$s" against a post of that type.' ), $post->post_type, $cap ), '4.4.0' );
                        $caps[] = 'edit_others_posts';
-                       // The post is published, extra cap required.
-                       if ($post->post_status == 'publish')
-                               $caps[] = 'edit_published_posts';
-                       else if ($post->post_status == 'private')
-                               $caps[] = 'edit_private_posts';
+                       break;
                }
-               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 == $page_author_data->ID) {
-                       // If the page is published...
-                       if ($page->post_status == 'publish')
-                               $caps[] = 'edit_published_pages';
-                       else
-                               // If the page is draft...
-                               $caps[] = 'edit_pages';
+
+               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;
+               }
+
+               $status_obj = get_post_status_object( $post->post_status );
+               if ( $status_obj->public ) {
+                       $caps[] = $post_type->cap->read;
+                       break;
+               }
+
+               if ( $post->post_author && $user_id == $post->post_author ) {
+                       $caps[] = $post_type->cap->read;
+               } elseif ( $status_obj->private ) {
+                       $caps[] = $post_type->cap->read_private_posts;
                } else {
-                       // The user is trying to edit someone else's page.
-                       $caps[] = 'edit_others_pages';
-                       // The page is published, extra cap required.
-                       if ($page->post_status == 'publish')
-                               $caps[] = 'edit_published_pages';
-                       else if ($page->post_status == 'private')
-                               $caps[] = 'edit_private_pages';
+                       $caps = map_meta_cap( 'edit_post', $user_id, $post->ID );
                }
                break;
-       case 'read_post':
-               $post = get_post($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);
+       case 'publish_post':
+               $post = get_post( $args[0] );
+               if ( ! $post ) {
+                       $caps[] = 'do_not_allow';
+                       break;
                }
 
-               if ( 'private' != $post->post_status ) {
-                       $caps[] = 'read';
+               $post_type = get_post_type_object( $post->post_type );
+               if ( ! $post_type ) {
+                       /* translators: 1: post type, 2: capability name */
+                       _doing_it_wrong( __FUNCTION__, sprintf( __( 'The post type %1$s is not registered, so it may not be reliable to check the capability "%2$s" against a post of that type.' ), $post->post_type, $cap ), '4.4.0' );
+                       $caps[] = 'edit_others_posts';
                        break;
                }
 
-               $author_data = get_userdata($user_id);
-               $post_author_data = get_userdata($post->post_author);
-               if ($user_id == $post_author_data->ID)
-                       $caps[] = 'read';
-               else
-                       $caps[] = 'read_private_posts';
+               $caps[] = $post_type->cap->publish_posts;
                break;
-       case 'read_page':
-               $page = get_page($args[0]);
+       case 'edit_post_meta':
+       case 'delete_post_meta':
+       case 'add_post_meta':
+               $post = get_post( $args[0] );
+               if ( ! $post ) {
+                       $caps[] = 'do_not_allow';
+                       break;
+               }
 
-               if ( 'private' != $page->post_status ) {
-                       $caps[] = 'read';
+               $caps = map_meta_cap( 'edit_post', $user_id, $post->ID );
+
+               $meta_key = isset( $args[ 1 ] ) ? $args[ 1 ] : false;
+
+               if ( $meta_key && has_filter( "auth_post_meta_{$meta_key}" ) ) {
+                       /**
+                        * Filter whether the user is allowed to add post meta to a post.
+                        *
+                        * The dynamic portion of the hook name, `$meta_key`, refers to the
+                        * meta key passed to {@see map_meta_cap()}.
+                        *
+                        * @since 3.3.0
+                        *
+                        * @param bool   $allowed  Whether the user can add the post meta. Default false.
+                        * @param string $meta_key The meta key.
+                        * @param int    $post_id  Post ID.
+                        * @param int    $user_id  User ID.
+                        * @param string $cap      Capability name.
+                        * @param array  $caps     User capabilities.
+                        */
+                       $allowed = apply_filters( "auth_post_meta_{$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] );
+               if ( ! $comment ) {
+                       $caps[] = 'do_not_allow';
                        break;
                }
 
-               $author_data = get_userdata($user_id);
-               $page_author_data = get_userdata($page->post_author);
-               if ($user_id == $page_author_data->ID)
-                       $caps[] = 'read';
+               $post = get_post( $comment->comment_post_ID );
+
+               /*
+                * If the post doesn't exist, we have an orphaned comment.
+                * Fall back to the edit_posts capability, instead.
+                */
+               if ( $post ) {
+                       $caps = map_meta_cap( 'edit_post', $user_id, $post->ID );
+               } else {
+                       $caps = map_meta_cap( 'edit_posts', $user_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 '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[] = 'read_private_pages';
+                       $caps[] = $cap;
+               break;
+       case 'update_plugins':
+       case 'delete_plugins':
+       case 'install_plugins':
+       case 'upload_plugins':
+       case 'update_themes':
+       case 'delete_themes':
+       case 'install_themes':
+       case 'upload_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';
+               } elseif ( 'upload_themes' === $cap ) {
+                       $caps[] = 'install_themes';
+               } elseif ( 'upload_plugins' === $cap ) {
+                       $caps[] = 'install_plugins';
+               } 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( $user_id ) || 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;
+       case 'customize' :
+               $caps[] = 'edit_theme_options';
+               break;
+       case 'delete_site':
+               $caps[] = 'manage_options';
                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 $caps;
+       /**
+        * Filter a user's capabilities depending on specific context and/or privilege.
+        *
+        * @since 2.8.0
+        *
+        * @param array  $caps    Returns the user's actual capabilities.
+        * @param string $cap     Capability name.
+        * @param int    $user_id The user ID.
+        * @param array  $args    Adds the context to the cap. Typically the object ID.
+        */
+       return apply_filters( 'map_meta_cap', $caps, $cap, $user_id, $args );
 }
 
-// Capability checking wrapper around the global $current_user object.
-function current_user_can($capability) {
+/**
+ * Whether the current user has a specific capability.
+ *
+ * While checking against particular roles in place of a capability is supported
+ * in part, this practice is discouraged as it may produce unreliable results.
+ *
+ * @since 2.0.0
+ *
+ * @see WP_User::has_cap()
+ * @see map_meta_cap()
+ *
+ * @param string $capability Capability name.
+ * @param int    $object_id  Optional. ID of the specific object to check against if `$capability` is a "meta" cap.
+ *                           "Meta" capabilities, e.g. 'edit_post', 'edit_user', etc., are capabilities used
+ *                           by map_meta_cap() to map to other "primitive" capabilities, e.g. 'edit_posts',
+ *                           'edit_others_posts', etc. Accessed via func_get_args() and passed to WP_User::has_cap(),
+ *                           then map_meta_cap().
+ * @return bool Whether the current user has the given capability. If `$capability` is a meta cap and `$object_id` is
+ *              passed, whether the current user has the given meta capability for the given object.
+ */
+function current_user_can( $capability ) {
        $current_user = wp_get_current_user();
 
-       if ( empty($current_user) )
+       if ( empty( $current_user ) )
                return false;
 
-       $args = array_slice(func_get_args(), 1);
-       $args = array_merge(array($capability), $args);
+       $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 );
 }
 
-// Convenience wrappers around $wp_roles.
-function get_role($role) {
-       global $wp_roles;
+/**
+ * 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 ) {
+       $switched = is_multisite() ? switch_to_blog( $blog_id ) : false;
 
-       if ( ! isset($wp_roles) )
-               $wp_roles = new WP_Roles();
+       $current_user = wp_get_current_user();
+
+       if ( empty( $current_user ) ) {
+               if ( $switched ) {
+                       restore_current_blog();
+               }
+               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 ( $switched ) {
+               restore_current_blog();
+       }
 
-       return $wp_roles->get_role($role);
+       return $can;
 }
 
-function add_role($role, $display_name, $capabilities = '') {
-       global $wp_roles;
+/**
+ * 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;
 
-       if ( ! isset($wp_roles) )
-               $wp_roles = new WP_Roles();
+       $author = get_userdata( $post->post_author );
 
-       return $wp_roles->add_role($role, $display_name, $capabilities);
+       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 );
 }
 
-function remove_role($role) {
+/**
+ * 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 );
+}
+
+/**
+ * Retrieves the global WP_Roles instance and instantiates it if necessary.
+ *
+ * @since 4.3.0
+ *
+ * @global WP_Roles $wp_roles WP_Roles global instance.
+ *
+ * @return WP_Roles WP_Roles global instance if not already instantiated.
+ */
+function wp_roles() {
        global $wp_roles;
 
-       if ( ! isset($wp_roles) )
+       if ( ! isset( $wp_roles ) ) {
                $wp_roles = new WP_Roles();
+       }
+       return $wp_roles;
+}
 
-       return $wp_roles->remove_role($role);
+/**
+ * Retrieve role object.
+ *
+ * @since 2.0.0
+ *
+ * @param string $role Role name.
+ * @return WP_Role|null WP_Role object if found, null if the role does not exist.
+ */
+function get_role( $role ) {
+       return wp_roles()->get_role( $role );
 }
 
-?>
+/**
+ * Add role, if it does not exist.
+ *
+ * @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 WP_Role|null WP_Role object if role is added, null if already exists.
+ */
+function add_role( $role, $display_name, $capabilities = array() ) {
+       if ( empty( $role ) ) {
+               return;
+       }
+       return wp_roles()->add_role( $role, $display_name, $capabilities );
+}
+
+/**
+ * Remove role, if it exists.
+ *
+ * @since 2.0.0
+ *
+ * @param string $role Role name.
+ */
+function remove_role( $role ) {
+       wp_roles()->remove_role( $role );
+}
+
+/**
+ * Retrieve a list of super admins.
+ *
+ * @since 3.0.0
+ *
+ * @global array $super_admins
+ *
+ * @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;
+}