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<title>[49302] trunk: REST API: Don't validate status if it hasn't changed.</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/49302">49302</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/49302","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>TimothyBlynJacobs</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2020-10-24 16:02:34 +0000 (Sat, 24 Oct 2020)</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: Don't validate status if it hasn't changed.

In particular, this allows for sending `status=inherit` to an attachment if it's current status is `inherit`. This status would be rejected because it is an "internal" post status which isn't exposed.

As a general rule, a developer should always be able to PUT back a GET response without error.

Props dfenton, pputzer, TimothyBlynJacobs.
Fixes <a href="https://core.trac.wordpress.org/ticket/40399">#40399</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>

</div>
<div id="patch">
<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       2020-10-24 14:10:26 UTC (rev 49301)
+++ trunk/src/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php 2020-10-24 16:02:34 UTC (rev 49302)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1052,7 +1052,8 @@
</span><span class="cx" style="display: block; padding: 0 10px">         * @return stdClass|WP_Error Post object or WP_Error.
</span><span class="cx" style="display: block; padding: 0 10px">         */
</span><span class="cx" style="display: block; padding: 0 10px">        protected function prepare_item_for_database( $request ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                $prepared_post = new stdClass();
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         $prepared_post  = new stdClass();
+               $current_status = '';
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                // Post ID.
</span><span class="cx" style="display: block; padding: 0 10px">                if ( isset( $request['id'] ) ) {
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1062,6 +1063,7 @@
</span><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">                        $prepared_post->ID = $existing_post->ID;
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                        $current_status    = $existing_post->post_status;
</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">                $schema = $this->get_item_schema();
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1105,7 +1107,11 @@
</span><span class="cx" style="display: block; padding: 0 10px">                $post_type = get_post_type_object( $prepared_post->post_type );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                // Post status.
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                if ( ! empty( $schema['properties']['status'] ) && isset( $request['status'] ) ) {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         if (
+                       ! empty( $schema['properties']['status'] ) &&
+                       isset( $request['status'] ) &&
+                       ( ! $current_status || $current_status !== $request['status'] )
+               ) {
</ins><span class="cx" style="display: block; padding: 0 10px">                         $status = $this->handle_status_param( $request['status'], $post_type );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                        if ( is_wp_error( $status ) ) {
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1256,6 +1262,32 @@
</span><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><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         * Checks whether the status is valid for the given post.
+        *
+        * Allows for sending an update request with the current status, even if that status would not be acceptable.
+        *
+        * @since 5.6.0
+        *
+        * @param string          $status  The provided status.
+        * @param WP_REST_Request $request The request object.
+        * @param string          $param   The parameter name.
+        * @return true|WP_Error True if the status is valid, or WP_Error if not.
+        */
+       public function check_status( $status, $request, $param ) {
+               if ( $request['id'] ) {
+                       $post = $this->get_post( $request['id'] );
+
+                       if ( ! is_wp_error( $post ) && $post->post_status === $status ) {
+                               return true;
+                       }
+               }
+
+               $args = $request->get_attributes()['args'][ $param ];
+
+               return rest_validate_value_from_schema( $status, $args, $param );
+       }
+
+       /**
</ins><span class="cx" style="display: block; padding: 0 10px">          * Determines validity and normalizes the given status parameter.
</span><span class="cx" style="display: block; padding: 0 10px">         *
</span><span class="cx" style="display: block; padding: 0 10px">         * @since 4.7.0
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2115,6 +2147,9 @@
</span><span class="cx" style="display: block; padding: 0 10px">                                        'type'        => 'string',
</span><span class="cx" style="display: block; padding: 0 10px">                                        'enum'        => array_keys( get_post_stati( array( 'internal' => false ) ) ),
</span><span class="cx" style="display: block; padding: 0 10px">                                        'context'     => array( 'view', 'edit' ),
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                                        'arg_options' => array(
+                                               'validate_callback' => array( $this, 'check_status' ),
+                                       ),
</ins><span class="cx" style="display: block; padding: 0 10px">                                 ),
</span><span class="cx" style="display: block; padding: 0 10px">                                'type'         => array(
</span><span class="cx" style="display: block; padding: 0 10px">                                        'description' => __( 'Type of Post for the object.' ),
</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        2020-10-24 14:10:26 UTC (rev 49301)
+++ trunk/tests/phpunit/tests/rest-api/rest-attachments-controller.php  2020-10-24 16:02:34 UTC (rev 49302)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1007,6 +1007,53 @@
</span><span class="cx" style="display: block; padding: 0 10px">                $this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
</span><span class="cx" style="display: block; padding: 0 10px">        }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+        /**
+        * @ticket 40399
+        */
+       public function test_update_item_with_existing_inherit_status() {
+               wp_set_current_user( self::$editor_id );
+               $parent_id     = self::factory()->post->create( array() );
+               $attachment_id = self::factory()->attachment->create_object(
+                       $this->test_file,
+                       $parent_id,
+                       array(
+                               'post_mime_type' => 'image/jpeg',
+                               'post_excerpt'   => 'A sample caption',
+                               'post_author'    => self::$editor_id,
+                       )
+               );
+
+               $request = new WP_REST_Request( 'POST', '/wp/v2/media/' . $attachment_id );
+               $request->set_param( 'status', 'inherit' );
+               $response = rest_get_server()->dispatch( $request );
+
+               $this->assertNotWPError( $response->as_error() );
+               $this->assertEquals( 'inherit', $response->get_data()['status'] );
+       }
+
+       /**
+        * @ticket 40399
+        */
+       public function test_update_item_with_new_inherit_status() {
+               wp_set_current_user( self::$editor_id );
+               $attachment_id = self::factory()->attachment->create_object(
+                       $this->test_file,
+                       0,
+                       array(
+                               'post_mime_type' => 'image/jpeg',
+                               'post_excerpt'   => 'A sample caption',
+                               'post_author'    => self::$editor_id,
+                               'post_status'    => 'private',
+                       )
+               );
+
+               $request = new WP_REST_Request( 'POST', '/wp/v2/media/' . $attachment_id );
+               $request->set_param( 'status', 'inherit' );
+               $response = rest_get_server()->dispatch( $request );
+
+               $this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
+       }
+
</ins><span class="cx" style="display: block; padding: 0 10px">         public function verify_attachment_roundtrip( $input = array(), $expected_output = array() ) {
</span><span class="cx" style="display: block; padding: 0 10px">                // Create the post.
</span><span class="cx" style="display: block; padding: 0 10px">                $request = new WP_REST_Request( 'POST', '/wp/v2/media' );
</span></span></pre>
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