From 2af89bf33f400bca7229dc3aa5f0056fd96be8cf Mon Sep 17 00:00:00 2001
From: Burcu Dogan <jbd@google.com>
Date: Thu, 24 Jul 2014 12:09:30 -0700
Subject: [PATCH] pubsub: Adding topic listing.

---
 lib/pubsub/index.js | 29 ++++++++++++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)

diff --git a/lib/pubsub/index.js b/lib/pubsub/index.js
index 30ef4715b63..227bbdb7d7b 100644
--- a/lib/pubsub/index.js
+++ b/lib/pubsub/index.js
@@ -211,7 +211,34 @@ Connection.prototype.subscribe = function(opts, opt_callback) {
   });
 };
 
-// TODO(jbd): Add listTopics.
+/**
+ * Lists topics.
+ * @param  {string}   query.pageToken     Page token.
+ * @param  {Number}   query.maxResults    Max number of results to return.
+ * @param  {Function} callback            Callback function.
+ */
+Connection.prototype.listTopics = function(query, callback) {
+  var that = this;
+  if (arguments.length < 2) {
+    callback = query;
+    query = {};
+  }
+  var q = util.extend({}, query);
+  q.query = 'cloud.googleapis.com/project in (' + this.fullProjectName_() + ')';
+  this.makeReq('GET', 'topics', q, true, function(err, result) {
+    if (err) { return callback(err); }
+    var items = result.topic || [];
+    var topics = items.map(function(item) {
+      return new Topic(that, item.name);
+    });
+    var nextQuery = null;
+    if (result.nextPageToken) {
+      nextQuery = q;
+      nextQuery.pageToken = result.nextPageToken;
+    }
+    callback(null, topics, nextQuery);
+  });
+};
 
 /**
  * Gets a topic.