1 files changed, 62 insertions, 0 deletions
diff --git a/plugins/jetpack/sync/class.jetpack-sync-module-meta.php b/plugins/jetpack/sync/class.jetpack-sync-module-meta.php
new file mode 100644
index 00000000..e3d43544
--- /dev/null
+++ b/plugins/jetpack/sync/class.jetpack-sync-module-meta.php
@@ -0,0 +1,62 @@
+<?php
+
+class Jetpack_Sync_Module_Meta extends Jetpack_Sync_Module {
+
+	public function name() {
+		return 'meta';
+	}
+
+	/**
+	 * This implementation of get_objects_by_id() is a bit hacky since we're not passing in an array of meta IDs,
+	 * but instead an array of post or comment IDs for which to retrieve meta for. On top of that,
+	 * we also pass in an associative array where we expect there to be 'meta_key' and 'ids' keys present.
+	 *
+	 * This seemed to be required since if we have missing meta on WP.com and need to fetch it, we don't know what
+	 * the meta key is, but we do know that we have missing meta for a given post or comment.
+	 *
+	 * @param string $object_type The type of object for which we retrieve meta. Either 'post' or 'comment'
+	 * @param array  $config Must include 'meta_key' and 'ids' keys
+	 *
+	 * @return array
+	 */
+	public function get_objects_by_id( $object_type, $config ) {
+		global $wpdb;
+
+		$table = _get_meta_table( $object_type );
+
+		if ( ! $table ) {
+			return array();
+		}
+
+		if ( ! isset( $config['meta_key'] ) || ! isset( $config['ids'] ) || ! is_array( $config['ids'] ) ) {
+			return array();
+		}
+
+		$meta_key         = $config['meta_key'];
+		$ids              = $config['ids'];
+		$object_id_column = $object_type . '_id';
+
+		// Sanitize so that the array only has integer values
+		$ids_string = implode( ', ', array_map( 'intval', $ids ) );
+		$metas      = $wpdb->get_results(
+			$wpdb->prepare(
+				"SELECT * FROM {$table} WHERE {$object_id_column} IN ( {$ids_string} ) AND meta_key = %s",
+				$meta_key
+			)
+		);
+
+		$meta_objects = array();
+		foreach ( (array) $metas as $meta_object ) {
+			$meta_object                                       = (array) $meta_object;
+			$meta_objects[ $meta_object[ $object_id_column ] ] = array(
+				'meta_type'  => $object_type,
+				'meta_id'    => $meta_object['meta_id'],
+				'meta_key'   => $meta_key,
+				'meta_value' => $meta_object['meta_value'],
+				'object_id'  => $meta_object[ $object_id_column ],
+			);
+		}
+
+		return $meta_objects;
+	}
+}