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

webrtc/libjingle/xmpp/xmppclient.h

Index: webrtc/libjingle/xmpp/xmppclient.h
diff --git a/webrtc/libjingle/xmpp/xmppclient.h b/webrtc/libjingle/xmpp/xmppclient.h
new file mode 100644
index 0000000000000000000000000000000000000000..dba591cb44a4769e08794ca63379cf031d31e6d0
--- /dev/null
+++ b/webrtc/libjingle/xmpp/xmppclient.h
@@ -0,0 +1,149 @@
+/*
+ *  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_XMPPCLIENT_H_
+#define WEBRTC_LIBJINGLE_XMPP_XMPPCLIENT_H_
+
+#include <memory>
+#include <string>
+
+#include "webrtc/libjingle/xmpp/asyncsocket.h"
+#include "webrtc/libjingle/xmpp/xmppclientsettings.h"
+#include "webrtc/libjingle/xmpp/xmppengine.h"
+#include "webrtc/libjingle/xmpp/xmpptask.h"
+#include "webrtc/base/sigslot.h"
+#include "webrtc/base/task.h"
+
+namespace buzz {
+
+class PreXmppAuth;
+class CaptchaChallenge;
+
+// Just some non-colliding number.  Could have picked "1".
+#define XMPP_CLIENT_TASK_CODE 0x366c1e47
+
+/////////////////////////////////////////////////////////////////////
+//
+// XMPPCLIENT
+//
+/////////////////////////////////////////////////////////////////////
+//
+// See Task first.  XmppClient is a parent task for XmppTasks.
+//
+// XmppClient is a task which is designed to be the parent task for
+// all tasks that depend on a single Xmpp connection.  If you want to,
+// for example, listen for subscription requests forever, then your
+// listener should be a task that is a child of the XmppClient that owns
+// the connection you are using.  XmppClient has all the utility methods
+// that basically drill through to XmppEngine.
+//
+// XmppClient is just a wrapper for XmppEngine, and if I were writing it
+// all over again, I would make XmppClient == XmppEngine.  Why?
+// XmppEngine needs tasks too, for example it has an XmppLoginTask which
+// should just be the same kind of Task instead of an XmppEngine specific
+// thing.  It would help do certain things like GAIA auth cleaner.
+//
+/////////////////////////////////////////////////////////////////////
+
+class XmppClient : public XmppTaskParentInterface,
+                   public XmppClientInterface,
+                   public sigslot::has_slots<>
+{
+public:
+  explicit XmppClient(rtc::TaskParent * parent);
+  virtual ~XmppClient();
+
+  XmppReturnStatus Connect(const XmppClientSettings & settings,
+                           const std::string & lang,
+                           AsyncSocket * socket,
+                           PreXmppAuth * preauth);
+
+  virtual int ProcessStart();
+  virtual int ProcessResponse();
+  XmppReturnStatus Disconnect();
+
+  sigslot::signal1<XmppEngine::State> SignalStateChange;
+  XmppEngine::Error GetError(int *subcode);
+
+  // When there is a <stream:error> stanza, return the stanza
+  // so that they can be handled.
+  const XmlElement *GetStreamError();
+
+  // When there is an authentication error, we may have captcha info
+  // that the user can use to unlock their account
+  CaptchaChallenge GetCaptchaChallenge();
+
+  // When authentication is successful, this returns the service token
+  // (if we used GAIA authentication)
+  std::string GetAuthMechanism();
+  std::string GetAuthToken();
+
+  XmppReturnStatus SendRaw(const std::string & text);
+
+  XmppEngine* engine();
+
+  sigslot::signal2<const char *, int> SignalLogInput;
+  sigslot::signal2<const char *, int> SignalLogOutput;
+
+  // As XmppTaskParentIntreface
+  virtual XmppClientInterface* GetClient() { return this; }
+
+  // As XmppClientInterface
+  virtual XmppEngine::State GetState() const;
+  virtual const Jid& jid() const;
+  virtual std::string NextId();
+  virtual XmppReturnStatus SendStanza(const XmlElement *stanza);
+  virtual XmppReturnStatus SendStanzaError(const XmlElement * pelOriginal,
+                                           XmppStanzaError code,
+                                           const std::string & text);
+  virtual void AddXmppTask(XmppTask *, XmppEngine::HandlerLevel);
+  virtual void RemoveXmppTask(XmppTask *);
+
+ private:
+  friend class XmppTask;
+
+  void OnAuthDone();
+
+  // Internal state management
+  enum {
+    STATE_PRE_XMPP_LOGIN = STATE_NEXT,
+    STATE_START_XMPP_LOGIN = STATE_NEXT + 1,
+  };
+  int Process(int state) {
+    switch (state) {
+      case STATE_PRE_XMPP_LOGIN: return ProcessTokenLogin();
+      case STATE_START_XMPP_LOGIN: return ProcessStartXmppLogin();
+      default: return Task::Process(state);
+    }
+  }
+
+  std::string GetStateName(int state) const {
+    switch (state) {
+      case STATE_PRE_XMPP_LOGIN:      return "PRE_XMPP_LOGIN";
+      case STATE_START_XMPP_LOGIN:  return "START_XMPP_LOGIN";
+      default: return Task::GetStateName(state);
+    }
+  }
+
+  int ProcessTokenLogin();
+  int ProcessStartXmppLogin();
+  void EnsureClosed();
+
+  class Private;
+  friend class Private;
+  std::unique_ptr<Private> d_;
+
+  bool delivering_signal_;
+  bool valid_;
+};
+
+}
+
+#endif  // WEBRTC_LIBJINGLE_XMPP_XMPPCLIENT_H_