Revert of Remove webrtc/libjingle/{xmllite,xmpp}

webrtc/libjingle/xmpp/mucroomuniquehangoutidtask.cc

+/*
+ *  Copyright 2012 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "webrtc/libjingle/xmpp/mucroomuniquehangoutidtask.h"
+
+#include "webrtc/libjingle/xmpp/constants.h"
+
+namespace buzz {
+
+MucRoomUniqueHangoutIdTask::MucRoomUniqueHangoutIdTask(XmppTaskParentInterface* parent,
+                                             const Jid& lookup_server_jid)
+    : IqTask(parent, STR_GET, lookup_server_jid, MakeUniqueRequestXml()) {
+}
+
+// Construct a stanza to request a unique room id. eg:
+//
+// <unique hangout-id="true" xmlns="http://jabber.org/protocol/muc#unique"/>
+XmlElement* MucRoomUniqueHangoutIdTask::MakeUniqueRequestXml() {
+  XmlElement* xml = new XmlElement(QN_MUC_UNIQUE_QUERY, false);
+  xml->SetAttr(QN_HANGOUT_ID, STR_TRUE);
+  return xml;
+}
+
+// Handle a response like the following:
+//
+// <unique hangout-id="hangout_id"
+//    xmlns="http://jabber.org/protocol/muc#unique"/>
+//  muvc-private-chat-guid@groupchat.google.com
+// </unique>
+void MucRoomUniqueHangoutIdTask::HandleResult(const XmlElement* stanza) {
+
+  const XmlElement* unique_elem = stanza->FirstNamed(QN_MUC_UNIQUE_QUERY);
+  if (unique_elem == NULL ||
+      !unique_elem->HasAttr(QN_HANGOUT_ID)) {
+    SignalError(this, stanza);
+    return;
+  }
+
+  std::string hangout_id = unique_elem->Attr(QN_HANGOUT_ID);
+
+  SignalResult(this, hangout_id);
+}
+
+} // namespace buzz