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

webrtc/libjingle/xmpp/saslplainmechanism.h

+/*
+ *  Copyright 2004 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.
+ */
+
+#ifndef WEBRTC_LIBJINGLE_XMPP_SASLPLAINMECHANISM_H_
+#define WEBRTC_LIBJINGLE_XMPP_SASLPLAINMECHANISM_H_
+
+#include "webrtc/libjingle/xmpp/saslmechanism.h"
+#include "webrtc/base/cryptstring.h"
+
+namespace buzz {
+
+class SaslPlainMechanism : public SaslMechanism {
+
+public:
+  SaslPlainMechanism(const buzz::Jid user_jid, const rtc::CryptString & password) :
+    user_jid_(user_jid), password_(password) {}
+
+  virtual std::string GetMechanismName() { return "PLAIN"; }
+
+  virtual XmlElement * StartSaslAuth() {
+    // send initial request
+    XmlElement * el = new XmlElement(QN_SASL_AUTH, true);
+    el->AddAttr(QN_MECHANISM, "PLAIN");
+
+    rtc::FormatCryptString credential;
+    credential.Append("\0", 1);
+    credential.Append(user_jid_.node());
+    credential.Append("\0", 1);
+    credential.Append(&password_);
+    el->AddText(Base64EncodeFromArray(credential.GetData(), credential.GetLength()));
+    return el;
+  }
+
+private:
+  Jid user_jid_;
+  rtc::CryptString password_;
+};
+
+}
+
+#endif  // WEBRTC_LIBJINGLE_XMPP_SASLPLAINMECHANISM_H_