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<title>[40108] trunk: REST API: Shim `post_date_gmt` for drafts / empty dates in the REST API.</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/40108">40108</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/40108","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>jnylen0</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2017-02-24 18:14:21 +0000 (Fri, 24 Feb 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: Shim `post_date_gmt` for drafts / empty dates in the REST API.

Internally, WordPress uses a special `post_date_gmt` value of `0000-00-00 00:00:00` to indicate that a draft's date is "floating" and should be updated whenever the post is saved.  This makes it much more difficult for API clients to know the correct date of a draft post.

This commit provides a best guess at a `date_gmt` value for draft posts in this situation using the `date` field and the site's current timezone offset.

Props joehoyle.
Fixes <a href="https://core.trac.wordpress.org/ticket/38883">#38883</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="#trunktestsphpunitincludestestcaserestposttypecontrollerphp">trunk/tests/phpunit/includes/testcase-rest-post-type-controller.php</a></li>
<li><a href="#trunktestsphpunittestsrestapirestpostscontrollerphp">trunk/tests/phpunit/tests/rest-api/rest-posts-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       2017-02-24 17:47:30 UTC (rev 40107)
+++ trunk/src/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php 2017-02-24 18:14:21 UTC (rev 40108)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1391,7 +1391,16 @@
</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">                if ( ! empty( $schema['properties']['date_gmt'] ) ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        $data['date_gmt'] = $this->prepare_date_response( $post->post_date_gmt );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 // For drafts, `post_date_gmt` may not be set, indicating that the
+                       // date of the draft should be updated each time it is saved (see
+                       // #38883).  In this case, shim the value based on the `post_date`
+                       // field with the site's timezone offset applied.
+                       if ( '0000-00-00 00:00:00' === $post->post_date_gmt ) {
+                               $post_date_gmt = date( 'Y-m-d H:i:s', strtotime( $post->post_date ) - ( get_option( 'gmt_offset' ) * 3600 ) );
+                       } else {
+                               $post_date_gmt = $post->post_date_gmt;
+                       }
+                       $data['date_gmt'] = $this->prepare_date_response( $post_date_gmt );
</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">                if ( ! empty( $schema['properties']['guid'] ) ) {
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1407,7 +1416,16 @@
</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">                if ( ! empty( $schema['properties']['modified_gmt'] ) ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        $data['modified_gmt'] = $this->prepare_date_response( $post->post_modified_gmt );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 // For drafts, `post_modified_gmt` may not be set (see
+                       // `post_date_gmt` comments above).  In this case, shim the value
+                       // based on the `post_modified` field with the site's timezone
+                       // offset applied.
+                       if ( '0000-00-00 00:00:00' === $post->post_modified_gmt ) {
+                               $post_modified_gmt = date( 'Y-m-d H:i:s', strtotime( $post->post_modified ) - ( get_option( 'gmt_offset' ) * 3600 ) );
+                       } else {
+                               $post_modified_gmt = $post->post_modified_gmt;
+                       }
+                       $data['modified_gmt'] = $this->prepare_date_response( $post_modified_gmt );
</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">                if ( ! empty( $schema['properties']['password'] ) ) {
</span></span></pre></div>
<a id="trunktestsphpunitincludestestcaserestposttypecontrollerphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/tests/phpunit/includes/testcase-rest-post-type-controller.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/includes/testcase-rest-post-type-controller.php       2017-02-24 17:47:30 UTC (rev 40107)
+++ trunk/tests/phpunit/includes/testcase-rest-post-type-controller.php 2017-02-24 18:14:21 UTC (rev 40108)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -10,12 +10,18 @@
</span><span class="cx" style="display: block; padding: 0 10px">                $this->assertEquals( $post->post_name, $data['slug'] );
</span><span class="cx" style="display: block; padding: 0 10px">                $this->assertEquals( get_permalink( $post->ID ), $data['link'] );
</span><span class="cx" style="display: block; padding: 0 10px">                if ( '0000-00-00 00:00:00' === $post->post_date_gmt ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        $this->assertNull( $data['date_gmt'] );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 $post_date_gmt = date( 'Y-m-d H:i:s', strtotime( $post->post_date ) - ( get_option( 'gmt_offset' ) * 3600 ) );
+                       $this->assertEquals( mysql_to_rfc3339( $post_date_gmt ), $data['date_gmt'] );
+               } else {
+                       $this->assertEquals( mysql_to_rfc3339( $post->post_date_gmt ), $data['date_gmt'] );
</ins><span class="cx" style="display: block; padding: 0 10px">                 }
</span><span class="cx" style="display: block; padding: 0 10px">                $this->assertEquals( mysql_to_rfc3339( $post->post_date ), $data['date'] );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                if ( '0000-00-00 00:00:00' === $post->post_modified_gmt ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        $this->assertNull( $data['modified_gmt'] );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 $post_modified_gmt = date( 'Y-m-d H:i:s', strtotime( $post->post_modified ) - ( get_option( 'gmt_offset' ) * 3600 ) );
+                       $this->assertEquals( mysql_to_rfc3339( $post_modified_gmt ), $data['modified_gmt'] );
+               } else {
+                       $this->assertEquals( mysql_to_rfc3339( $post->post_modified_gmt ), $data['modified_gmt'] );
</ins><span class="cx" style="display: block; padding: 0 10px">                 }
</span><span class="cx" style="display: block; padding: 0 10px">                $this->assertEquals( mysql_to_rfc3339( $post->post_modified ), $data['modified'] );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -139,18 +145,6 @@
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                if ( 'edit' === $context ) {
</span><span class="cx" style="display: block; padding: 0 10px">                        $this->assertEquals( $post->guid, $data['guid']['raw'] );
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-
-                       if ( '0000-00-00 00:00:00' === $post->post_date_gmt ) {
-                               $this->assertNull( $data['date_gmt'] );
-                       } else {
-                               $this->assertEquals( mysql_to_rfc3339( $post->post_date_gmt ), $data['date_gmt'] );
-                       }
-
-                       if ( '0000-00-00 00:00:00' === $post->post_modified_gmt ) {
-                               $this->assertNull( $data['modified_gmt'] );
-                       } else {
-                               $this->assertEquals( mysql_to_rfc3339( $post->post_modified_gmt ), $data['modified_gmt'] );
-                       }
</del><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">                $taxonomies = wp_list_filter( get_object_taxonomies( $post->post_type, 'objects' ), array( 'show_in_rest' => true ) );
</span></span></pre></div>
<a id="trunktestsphpunittestsrestapirestpostscontrollerphp"></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-posts-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-posts-controller.php      2017-02-24 17:47:30 UTC (rev 40107)
+++ trunk/tests/phpunit/tests/rest-api/rest-posts-controller.php        2017-02-24 18:14:21 UTC (rev 40108)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1251,7 +1251,6 @@
</span><span class="cx" style="display: block; padding: 0 10px">                $this->assertEquals( $post_date, $post->post_date );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                $this->assertEquals( $results['date_gmt'], $data['date_gmt'] );
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                // TODO expect null here for drafts (see https://core.trac.wordpress.org/ticket/5698#comment:14)
</del><span class="cx" style="display: block; padding: 0 10px">                 $post_date_gmt = str_replace( 'T', ' ', $results['date_gmt'] );
</span><span class="cx" style="display: block; padding: 0 10px">                $this->assertEquals( $post_date_gmt, $post->post_date_gmt );
</span><span class="cx" style="display: block; padding: 0 10px">        }
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1350,15 +1349,27 @@
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        public function test_create_post_as_contributor() {
</span><span class="cx" style="display: block; padding: 0 10px">                wp_set_current_user( self::$contributor_id );
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                update_option( 'timezone_string', 'America/Chicago' );
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                $request = new WP_REST_Request( 'POST', '/wp/v2/posts' );
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                $params = $this->set_post_data(array(
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         $params = $this->set_post_data( array(
+                       // This results in a special `post_date_gmt` value of
+                       // '0000-00-00 00:00:00'.  See #38883.
</ins><span class="cx" style="display: block; padding: 0 10px">                         'status' => 'pending',
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                ));
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         ) );
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                $request->set_body_params( $params );
</span><span class="cx" style="display: block; padding: 0 10px">                $response = $this->server->dispatch( $request );
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                $this->assertEquals( 201, $response->get_status() );
+
+               $data = $response->get_data();
+               $post = get_post( $data['id'] );
+               $this->assertEquals( '0000-00-00 00:00:00', $post->post_date_gmt );
+               $this->assertNotEquals( '0000-00-00T00:00:00', $data['date_gmt'] );
+
</ins><span class="cx" style="display: block; padding: 0 10px">                 $this->check_create_post_response( $response );
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+
+               update_option( 'timezone_string', '' );
</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">        public function test_create_post_sticky() {
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1431,9 +1442,12 @@
</span><span class="cx" style="display: block; padding: 0 10px">                $new_post = get_post( $data['id'] );
</span><span class="cx" style="display: block; padding: 0 10px">                $this->assertEquals( 'draft', $data['status'] );
</span><span class="cx" style="display: block; padding: 0 10px">                $this->assertEquals( 'draft', $new_post->post_status );
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                // Confirm dates are null
-               $this->assertNull( $data['date_gmt'] );
-               $this->assertNull( $data['modified_gmt'] );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         // Confirm dates are shimmed for gmt_offset
+               $post_modified_gmt = date( 'Y-m-d H:i:s', strtotime( $new_post->post_modified ) + ( get_option( 'gmt_offset' ) * 3600 ) );
+               $post_date_gmt = date( 'Y-m-d H:i:s', strtotime( $new_post->post_date ) + ( get_option( 'gmt_offset' ) * 3600 ) );
+
+               $this->assertEquals( mysql_to_rfc3339( $post_modified_gmt ), $data['modified_gmt'] );
+               $this->assertEquals( mysql_to_rfc3339( $post_date_gmt ), $data['date_gmt'] );
</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">        public function test_create_post_private() {
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2118,7 +2132,6 @@
</span><span class="cx" style="display: block; padding: 0 10px">                $this->assertEquals( $post_date, $post->post_date );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                $this->assertEquals( $results['date_gmt'], $data['date_gmt'] );
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                // TODO expect null here for drafts (see https://core.trac.wordpress.org/ticket/5698#comment:14)
</del><span class="cx" style="display: block; padding: 0 10px">                 $post_date_gmt = str_replace( 'T', ' ', $results['date_gmt'] );
</span><span class="cx" style="display: block; padding: 0 10px">                $this->assertEquals( $post_date_gmt, $post->post_date_gmt );
</span><span class="cx" style="display: block; padding: 0 10px">        }
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2149,6 +2162,57 @@
</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">+        public function test_empty_post_date_gmt_shimmed_using_post_date() {
+               global $wpdb;
+
+               wp_set_current_user( self::$editor_id );
+               update_option( 'timezone_string', 'America/Chicago' );
+
+               // Need to set dates using wpdb directly because `wp_update_post` and
+               // `wp_insert_post` have additional validation on dates.
+               $post_id = $this->factory->post->create();
+               $wpdb->update(
+                       $wpdb->posts,
+                       array(
+                               'post_date'     => '2016-02-23 12:00:00',
+                               'post_date_gmt' => '0000-00-00 00:00:00',
+                       ),
+                       array(
+                               'ID' => $post_id,
+                       ),
+                       array( '%s', '%s' ),
+                       array( '%d' )
+               );
+               wp_cache_delete( $post_id, 'posts' );
+
+               $post = get_post( $post_id );
+               $this->assertEquals( $post->post_date,     '2016-02-23 12:00:00' );
+               $this->assertEquals( $post->post_date_gmt, '0000-00-00 00:00:00' );
+
+               $request = new WP_REST_Request( 'GET', sprintf( '/wp/v2/posts/%d', $post_id ) );
+               $response = $this->server->dispatch( $request );
+               $this->assertEquals( 200, $response->get_status() );
+               $data = $response->get_data();
+
+               $this->assertEquals( '2016-02-23T12:00:00', $data['date'] );
+               $this->assertEquals( '2016-02-23T18:00:00', $data['date_gmt'] );
+
+               $request = new WP_REST_Request( 'PUT', sprintf( '/wp/v2/posts/%d', $post_id ) );
+               $request->set_param( 'date', '2016-02-23T13:00:00' );
+               $response = $this->server->dispatch( $request );
+               $this->assertEquals( 200, $response->get_status() );
+               $data = $response->get_data();
+
+               $this->assertEquals( '2016-02-23T13:00:00', $data['date'] );
+               $this->assertEquals( '2016-02-23T19:00:00', $data['date_gmt'] );
+
+               $post = get_post( $post_id );
+               $this->assertEquals( $post->post_date,     '2016-02-23 13:00:00' );
+               $this->assertEquals( $post->post_date_gmt, '2016-02-23 19:00:00' );
+
+               update_option( 'timezone_string', '' );
+       }
+
</ins><span class="cx" style="display: block; padding: 0 10px">         public function test_update_post_slug() {
</span><span class="cx" style="display: block; padding: 0 10px">                wp_set_current_user( self::$editor_id );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span></span></pre>
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