Changeset 47178

Timestamp:

02/04/2020 10:13:15 PM (4 years ago)

Author:

SergeyBiryukov

Message:

Posts, Post Types: Fail gracefully when checking mapped cap against unregistered post status.

With map_meta_cap enabled for a post type, the read_post capability for posts with a public status is supposed to be mapped to the post type's read capability.

When a post is left in the database after the post status is no longer present, and WP does a read_post check against it, a PHP notice was thrown, and the cap check always failed.

As a more graceful fallback, the cap is now mapped onto edit_others_posts, which allows highly privileged users to be able to access orphaned content.

A _doing_it_wrong() notice is also added, so that developers and site administrators are aware that the cap mapping is failing in the absence of the registered post status.

Follow-up to [34091], which introduced a similar approach to checking mapped caps against an unregistered post type.

Props roytanck, SergeyBiryukov.
Fixes #48653.

Location:

trunk

Files:

• src/wp-includes/capabilities.php (modified) (1 diff)
• tests/phpunit/tests/user/capabilities.php (modified) (1 diff)

trunk/src/wp-includes/capabilities.php

@@ -242 +242 @@
 
             $status_obj = get_post_status_object( $post->post_status );
+            if ( ! $status_obj ) {
+                /* translators: 1: Post status, 2: Capability name. */
+                _doing_it_wrong( __FUNCTION__, sprintf( __( 'The post status %1$s is not registered, so it may not be reliable to check the capability "%2$s" against a post with that status.' ), $post->post_status, $cap ), '5.4.0' );
+                $caps[] = 'edit_others_posts';
+                break;
+            }
+
             if ( $status_obj->public ) {
                 $caps[] = $post_type->cap->read;

trunk/tests/phpunit/tests/user/capabilities.php

@@ -1775 +1775 @@
 
     /**
+     * @ticket 48653
+     * @expectedIncorrectUsage map_meta_cap
+     */
+    function test_require_edit_others_posts_if_post_status_doesnt_exist() {
+        register_post_status( 'existed' );
+        $post_id = self::factory()->post->create( array( 'post_status' => 'existed' ) );
+        _unregister_post_status( 'existed' );
+
+        $subscriber_id = self::$users['subscriber']->ID;
+        $editor_id     = self::$users['editor']->ID;
+
+        foreach ( array( 'read_post', 'read_page' ) as $cap ) {
+            wp_set_current_user( $subscriber_id );
+            $this->assertSame( array( 'edit_others_posts' ), map_meta_cap( $cap, $subscriber_id, $post_id ) );
+            $this->assertFalse( current_user_can( $cap, $post_id ) );
+
+            wp_set_current_user( $editor_id );
+            $this->assertSame( array( 'edit_others_posts' ), map_meta_cap( $cap, $editor_id, $post_id ) );
+            $this->assertTrue( current_user_can( $cap, $post_id ) );
+        }
+    }
+
+    /**
      * @ticket 17253
      */