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<title>[40306] trunk: REST API: Confirm the parent post object of an attachment exists in `WP_REST_Posts_Controller::check_read_permission()`.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/40306">40306</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"https://core.trac.wordpress.org/changeset/40306","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>rachelbaker</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2017-03-20 04:29:50 +0000 (Mon, 20 Mar 2017)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>REST API: Confirm the parent post object of an attachment exists in `WP_REST_Posts_Controller::check_read_permission()`.

Avoid a PHP Error when attempting to embed the parent post of an attachment, when the parent post ID is invalid. Instead check if the parent post object exists before checking the read permission for the parent post.

Props GhostToast.
Fixes <a href="https://core.trac.wordpress.org/ticket/39881">#39881</a>. </pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludesrestapiendpointsclasswprestpostscontrollerphp">trunk/src/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php</a></li>
<li><a href="#trunktestsphpunittestsrestapirestattachmentscontrollerphp">trunk/tests/phpunit/tests/rest-api/rest-attachments-controller.php</a></li>
</ul>

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<h3>Diff</h3>
<a id="trunksrcwpincludesrestapiendpointsclasswprestpostscontrollerphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php       2017-03-19 16:21:38 UTC (rev 40305)
+++ trunk/src/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php 2017-03-20 04:29:50 UTC (rev 40306)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1294,7 +1294,9 @@
</span><span class="cx" style="display: block; padding: 0 10px">                // Can we read the parent if we're inheriting?
</span><span class="cx" style="display: block; padding: 0 10px">                if ( 'inherit' === $post->post_status && $post->post_parent > 0 ) {
</span><span class="cx" style="display: block; padding: 0 10px">                        $parent = get_post( $post->post_parent );
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        return $this->check_read_permission( $parent );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 if ( $parent ) {
+                               return $this->check_read_permission( $parent );
+                       }
</ins><span class="cx" style="display: block; padding: 0 10px">                 }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                /*
</span></span></pre></div>
<a id="trunktestsphpunittestsrestapirestattachmentscontrollerphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/tests/phpunit/tests/rest-api/rest-attachments-controller.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/rest-api/rest-attachments-controller.php        2017-03-19 16:21:38 UTC (rev 40305)
+++ trunk/tests/phpunit/tests/rest-api/rest-attachments-controller.php  2017-03-20 04:29:50 UTC (rev 40306)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -480,6 +480,31 @@
</span><span class="cx" style="display: block; padding: 0 10px">                $this->assertEquals( 403, $response->get_status() );
</span><span class="cx" style="display: block; padding: 0 10px">        }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+        public function test_get_item_inherit_status_with_invalid_parent() {
+               $attachment_id = $this->factory->attachment->create_object( $this->test_file, REST_TESTS_IMPOSSIBLY_HIGH_NUMBER, array(
+                       'post_mime_type' => 'image/jpeg',
+                       'post_excerpt'   => 'A sample caption',
+               ) );
+               $request = new WP_REST_Request( 'GET', sprintf( '/wp/v2/media/%d', $attachment_id ) );
+               $response = $this->server->dispatch( $request );
+               $data = $response->get_data();
+
+               $this->assertEquals( 200, $response->get_status() );
+               $this->assertEquals( $attachment_id, $data['id'] );
+       }
+
+       public function test_get_item_auto_status_with_invalid_parent_returns_error() {
+               $attachment_id = $this->factory->attachment->create_object( $this->test_file, REST_TESTS_IMPOSSIBLY_HIGH_NUMBER, array(
+                       'post_mime_type' => 'image/jpeg',
+                       'post_excerpt'   => 'A sample caption',
+                       'post_status'    => 'auto-draft',
+               ) );
+               $request = new WP_REST_Request( 'GET', sprintf( '/wp/v2/media/%d', $attachment_id ) );
+               $response = $this->server->dispatch( $request );
+
+               $this->assertErrorResponse( 'rest_forbidden', $response, 403 );
+       }
+
</ins><span class="cx" style="display: block; padding: 0 10px">         public function test_create_item() {
</span><span class="cx" style="display: block; padding: 0 10px">                wp_set_current_user( self::$author_id );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span></span></pre>
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