Ticket #20564: 20564.8.diff

src/wp-admin/includes/post.php

@@ -1350 +1350 @@
                 $new_autosave['ID'] = $old_autosave->ID;
                 $new_autosave['post_author'] = $post_author;
 
+                // Auto-save revisioned meta fields.
+                foreach ( _wp_post_revision_meta_keys() as $meta_key ) {
+                        if ( isset( $_POST[ $meta_key ] )
+                                && get_post_meta( $new_autosave['ID'], $meta_key, true ) != $_POST[ $meta_key ] )
+                        {
+                                /*
+                                 * Use the underlying delete_metadata() and add_metadata() functions
+                                 * vs delete_post_meta() and add_post_meta() to make sure we're working
+                                 * with the actual revision meta.
+                                 */
+                                delete_metadata( 'post', $new_autosave['ID'], $meta_key );
+                                if ( ! empty( $_POST[ $meta_key ] ) ) {
+                                        add_metadata( 'post', $new_autosave['ID'], $meta_key, $_POST[ $meta_key ] );
+                                }
+                        }
+                }
+
                 // If the new autosave is the same content as the post, delete the old autosave.
                 $post = get_post( $post_id );
                 $autosave_is_different = false;

src/wp-includes/revision.php

@@ -28 +28 @@
         if ( !$fields ) {
                 // Allow these to be versioned
                 $fields = array(
-                        'post_title' => __( 'Title' ),
+                        'post_title'   => __( 'Title' ),
                         'post_content' => __( 'Content' ),
                         'post_excerpt' => __( 'Excerpt' ),
                 );
 
-                // Runs only once
+                /**
+                 * Filter the list of post fields to be revisioned.
+                 *
+                 * Fields are only revisioned once.
+                 *
+                 * @since 3.9.0
+                 *
+                 * @param array $fields An array of fields to be revisioned.
+                 */
                 $fields = apply_filters( '_wp_post_revision_fields', $fields );
 
                 // WP uses these internally either in versioning or elsewhere - they cannot be versioned
-                foreach ( array( 'ID', 'post_name', 'post_parent', 'post_date', 'post_date_gmt', 'post_status', 'post_type', 'comment_count', 'post_author' ) as $protect )
+                foreach ( array( 'ID', 'post_name', 'post_parent', 'post_date', 'post_date_gmt', 'post_status', 'post_type', 'comment_count', 'post_author' ) as $protect ) {
                         unset( $fields[$protect] );
+                }
         }
 
         if ( !is_array($post) )
@@ -59 +68 @@
 }
 
 /**
+ * Determine which post meta fields should be revisioned.
+ *
+ * @access private
+ * @since 3.9.0
+ *
+ * @return array An array of meta keys to be revisioned.
+ */
+function _wp_post_revision_meta_keys() {
+        /**
+         * Filter the list of post meta keys to be revisioned.
+         *
+         * @since 3.9.0
+         *
+         * @param array $keys An array of default meta fields to be revisioned.
+         */
+        return apply_filters( 'wp_post_revision_meta_keys', array() );
+}
+
+/**
  * Saves an already existing post as a post revision.
  *
  * Typically used immediately after post updates.
@@ -102 +130 @@
                 if ( isset( $last_revision ) && apply_filters( 'wp_save_post_revision_check_for_changes', true, $last_revision, $post ) ) {
                         $post_has_changed = false;
 
+                        // Check whether revisioned post fields have been changed.
                         foreach ( array_keys( _wp_post_revision_fields() ) as $field ) {
                                 if ( normalize_whitespace( $post->$field ) != normalize_whitespace( $last_revision->$field ) ) {
                                         $post_has_changed = true;
                                         break;
                                 }
                         }
-                        //don't save revision if post unchanged
+
+                        // Check whether revisioned post meta fields have changed.
+                        foreach ( _wp_post_revision_meta_keys() as $meta_key ) {
+                                if ( get_post_meta( $post->ID, $meta_key ) != get_post_meta( $last_revision->ID, $meta_key ) ) {
+                                        $post_has_changed = true;
+                                        break;
+                                }
+                        }
+
+                        // Don't save revision if the post is unchanged.
                         if( ! $post_has_changed )
                                 return;
                 }
@@ -240 +278 @@
         if ( $revision_id )
                 do_action( '_wp_put_post_revision', $revision_id );
 
+        // Save revisioned meta fields.
+        foreach ( _wp_post_revision_meta_keys() as $meta_key ) {
+                $meta_value = get_post_meta( $post_id, $meta_key, true );
+                if ( empty( $meta_value ) ) {
+                        continue;
+                }
+
+                /*
+                 * Use the underlying add_metadata() function vs add_post_meta()
+                 * to ensure metadata is added to the revision post and not its parent.
+                 */
+                add_metadata( 'post', $revision_id, $meta_key, wp_slash( $meta_value ) );
+        }
+
         return $revision_id;
 }
 
@@ -308 +360 @@
 
         $update['ID'] = $revision['post_parent'];
 
+        // Restore revisioned meta fields.
+        foreach ( _wp_post_revision_meta_keys() as $meta_key ) {
+                $meta_value = get_post_meta( $revision['ID'], $meta_key, true );
+                if ( empty( $meta_value ) ) {
+                        $meta_value = '';
+                }
+
+                // Add slashes to data pulled from the database.
+                update_post_meta( $update['ID'], $meta_key, wp_slash( $meta_value ) );
+        }
+
         $update = wp_slash( $update ); //since data is from db
 
+        // Restore revisioned meta fields.
+        foreach ( _wp_post_revision_meta_keys() as $meta_key ) {
+                delete_post_meta( $update['ID'], $meta_key );
+                $meta_values = get_post_meta( $revision['ID'], $meta_key );
+                if ( false === $meta_values ) {
+                        continue;
+                }
+
+                foreach ( $meta_values as $meta_value ) {
+                        add_post_meta( $update['ID'], $meta_key, $meta_value );
+                }
+        }
+
         $post_id = wp_update_post( $update );
         if ( ! $post_id || is_wp_error( $post_id ) )
                 return $post_id;
@@ -449 +525 @@
         $post->post_excerpt = $preview->post_excerpt;
 
         add_filter( 'get_the_terms', '_wp_preview_terms_filter', 10, 3 );
+        add_filter( 'get_post_metadata', '_wp_preview_meta_filter', 10, 4 );
 
         return $post;
 }
@@ -472 +549 @@
 }
 
 /**
+ * Filters post meta retrieval to get values from the actual autosave post,
+ * and not its parent.
+ *
+ * Filters revisioned meta keys only.
+ *
+ * @access private
+ * @since 3.9.0
+ *
+ * @param mixed  $value     Meta value to filter.
+ * @param int    $object_id Object ID.
+ * @param string $meta_key  Meta key to filter a value for.
+ * @param bool   $single    Whether to return a single value. Default false.
+ * @return mixed Original meta value if the meta key isn't revisioned, the object doesn't exist,
+ *               the post type is a revisionm or the post ID doesn't match the object ID.
+ *               Otherwise, the revisioned meta value is returned for the preview.
+ */
+function _wp_preview_meta_filter( $value, $object_id, $meta_key, $single ) {
+        $post = get_post();
+        if ( empty( $post )
+                || $post->ID != $object_id
+                || ! in_array( $meta_key, _wp_post_revision_meta_keys() )
+                || 'revision' == $post->post_type )
+        {
+                return $value;
+        }
+
+        // Grab the autosave.
+        $preview = wp_get_post_autosave( $post->ID );
+        if ( ! is_object( $preview ) ) {
+                return $value;
+        }
+
+        return get_post_meta( $preview->ID, $meta_key, $single );
+}
+
+/**
  * Filters terms lookup to set the post format.
  *
  * @since 3.6.0

tests/phpunit/tests/post/revisions.php

@@ -338 +338 @@
                         $this->assertTrue( user_can( $author_user_id, 'read_post', $revision->ID ) );
                 }
         }
+
+        /**
+         * Test the revisions system for storage of meta values
+         * @ticket 20564
+         */
+        function test_revisions_stores_meta_values() {
+                // Set up a new post
+                $original_post_id = $post_id = $this->factory->post->create();
+                // And update to store an initial revision
+                wp_update_post( array( 'post_content'   => 'some initial content', 'ID' => $post_id ) );
+
+                /**
+                 * First set up a meta value
+                 */
+
+                // Store a custom meta value, which is not revisioned by default
+                update_post_meta( $post_id, 'meta_revision_test', 'original' );
+
+                // Update the post, storing a revision
+                wp_update_post( array( 'post_content'   => 'some more content', 'ID' => $post_id ) );
+
+                //  Next, store some updated meta values for the same key
+                update_post_meta( $post_id, 'meta_revision_test', 'update1' );
+
+                // Save the post, changing content to force a revision
+                wp_update_post( array( 'post_content'   => 'some updated content', 'ID' => $post_id ) );
+
+                /**
+                 * Now restore the original revision
+                 */
+
+                // Get all the revisions
+                $revisions = (Array)wp_get_post_revisions( $post_id );
+
+                // Go back two revisions (the 1st 'previous' revision matches the current post)
+                array_pop( $revisions );
+                $last_revision = array_pop( $revisions );
+
+                // Restore!
+                wp_restore_post_revision( $last_revision->ID );
+
+                /**
+                 * Check the meta values to verify they are NOT revisioned - they are not revisioned by default
+                 */
+
+                // Custom post meta should NOT be restored, orignal value should not be restored, value still 'update1'
+                $this->assertEquals( 'update1', get_post_meta( $post_id, 'meta_revision_test', true ) );
+
+                /*
+                 * Now test the revisioning of custom meta when enabled by the wp_post_revision_meta_keys filter
+                 */
+
+                // Add the custom field to be revised via the wp_post_revision_meta_keys filter
+                add_filter( 'wp_post_revision_meta_keys', function( $keys ) {
+                        $keys[] = 'meta_revision_test';
+                        return $keys;
+                });
+
+                /**
+                 * Save new meta in the revisioned field
+                 */
+
+                // Save the post again, custom meta should now be revisioned - note no change in content, revision still saved
+                wp_update_post( array( 'ID' => $post_id ) );
+
+                // Store custom meta values, which should now be revisioned
+                update_post_meta( $post_id, 'meta_revision_test', 'update2' );
+
+                // Save the post again
+                wp_update_post( array( 'ID' => $post_id ) );
+
+                // Retore the previous revision
+                $revisions = wp_get_post_revisions( $post_id );
+
+                // Go back two to load the previous revision
+                array_pop( $revisions );
+                $last_revision = array_pop( $revisions );
+                wp_restore_post_revision( $last_revision->ID );
+
+                // Verify that previous post meta is restored
+                $this->assertEquals( 'update1', get_post_meta( $post_id, 'meta_revision_test', true ) );
+
+                // Cleanup!
+                wp_delete_post( $original_post_id );
+
+        }
 }