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

webrtc/libjingle/xmpp/xmppengine.h

Index: webrtc/libjingle/xmpp/xmppengine.h
diff --git a/webrtc/libjingle/xmpp/xmppengine.h b/webrtc/libjingle/xmpp/xmppengine.h
new file mode 100644
index 0000000000000000000000000000000000000000..2bc2453ce6006cd01524b3759a6d7e814ca9c4b7
--- /dev/null
+++ b/webrtc/libjingle/xmpp/xmppengine.h
@@ -0,0 +1,332 @@
+/*
+ *  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_XMPPENGINE_H_
+#define WEBRTC_LIBJINGLE_XMPP_XMPPENGINE_H_
+
+// also part of the API
+#include "webrtc/libjingle/xmllite/qname.h"
+#include "webrtc/libjingle/xmllite/xmlelement.h"
+#include "webrtc/libjingle/xmpp/jid.h"
+
+
+namespace buzz {
+
+class XmppEngine;
+class SaslHandler;
+typedef void * XmppIqCookie;
+
+//! XMPP stanza error codes.
+//! Used in XmppEngine.SendStanzaError().
+enum XmppStanzaError {
+  XSE_BAD_REQUEST,
+  XSE_CONFLICT,
+  XSE_FEATURE_NOT_IMPLEMENTED,
+  XSE_FORBIDDEN,
+  XSE_GONE,
+  XSE_INTERNAL_SERVER_ERROR,
+  XSE_ITEM_NOT_FOUND,
+  XSE_JID_MALFORMED,
+  XSE_NOT_ACCEPTABLE,
+  XSE_NOT_ALLOWED,
+  XSE_PAYMENT_REQUIRED,
+  XSE_RECIPIENT_UNAVAILABLE,
+  XSE_REDIRECT,
+  XSE_REGISTRATION_REQUIRED,
+  XSE_SERVER_NOT_FOUND,
+  XSE_SERVER_TIMEOUT,
+  XSE_RESOURCE_CONSTRAINT,
+  XSE_SERVICE_UNAVAILABLE,
+  XSE_SUBSCRIPTION_REQUIRED,
+  XSE_UNDEFINED_CONDITION,
+  XSE_UNEXPECTED_REQUEST,
+};
+
+// XmppReturnStatus
+//    This is used by API functions to synchronously return status.
+enum XmppReturnStatus {
+  XMPP_RETURN_OK,
+  XMPP_RETURN_BADARGUMENT,
+  XMPP_RETURN_BADSTATE,
+  XMPP_RETURN_PENDING,
+  XMPP_RETURN_UNEXPECTED,
+  XMPP_RETURN_NOTYETIMPLEMENTED,
+};
+
+// TlsOptions
+//    This is used by API to identify TLS setting.
+enum TlsOptions {
+  TLS_DISABLED,
+  TLS_ENABLED,
+  TLS_REQUIRED
+};
+
+//! Callback for socket output for an XmppEngine connection.
+//! Register via XmppEngine.SetOutputHandler.  An XmppEngine
+//! can call back to this handler while it is processing
+//! Connect, SendStanza, SendIq, Disconnect, or HandleInput.
+class XmppOutputHandler {
+public:
+  virtual ~XmppOutputHandler() {}
+
+  //! Deliver the specified bytes to the XMPP socket.
+  virtual void WriteOutput(const char * bytes, size_t len) = 0;
+
+  //! Initiate TLS encryption on the socket.
+  //! The implementation must verify that the SSL
+  //! certificate matches the given domainname.
+  virtual void StartTls(const std::string & domainname) = 0;
+
+  //! Called when engine wants the connecton closed.
+  virtual void CloseConnection() = 0;
+};
+
+//! Callback to deliver engine state change notifications
+//! to the object managing the engine.
+class XmppSessionHandler {
+public:
+  virtual ~XmppSessionHandler() {}
+  //! Called when engine changes state. Argument is new state.
+  virtual void OnStateChange(int state) = 0;
+};
+
+//! Callback to deliver stanzas to an Xmpp application module.
+//! Register via XmppEngine.SetDefaultSessionHandler or via
+//! XmppEngine.AddSessionHAndler.  
+class XmppStanzaHandler {
+public:
+  virtual ~XmppStanzaHandler() {}
+  //! Process the given stanza.
+  //! The handler must return true if it has handled the stanza.
+  //! A false return value causes the stanza to be passed on to
+  //! the next registered handler.
+  virtual bool HandleStanza(const XmlElement * stanza) = 0;
+};
+
+//! Callback to deliver iq responses (results and errors).
+//! Register while sending an iq via XmppEngine.SendIq.
+//! Iq responses are routed to matching XmppIqHandlers in preference
+//! to sending to any registered SessionHandlers.
+class XmppIqHandler {
+public:
+  virtual ~XmppIqHandler() {}
+  //! Called to handle the iq response.
+  //! The response may be either a result or an error, and will have
+  //! an 'id' that matches the request and a 'from' that matches the
+  //! 'to' of the request.  Called no more than once; once this is
+  //! called, the handler is automatically unregistered.
+  virtual void IqResponse(XmppIqCookie cookie, const XmlElement * pelStanza) = 0;
+};
+
+//! The XMPP connection engine.
+//! This engine implements the client side of the 'core' XMPP protocol.
+//! To use it, register an XmppOutputHandler to handle socket output
+//! and pass socket input to HandleInput.  Then application code can
+//! set up the connection with a user, password, and other settings,
+//! and then call Connect() to initiate the connection.
+//! An application can listen for events and receive stanzas by
+//! registering an XmppStanzaHandler via AddStanzaHandler().
+class XmppEngine {
+public:
+  static XmppEngine * Create();
+  virtual ~XmppEngine() {}
+
+  //! Error codes. See GetError().
+  enum Error {
+    ERROR_NONE = 0,         //!< No error
+    ERROR_XML,              //!< Malformed XML or encoding error
+    ERROR_STREAM,           //!< XMPP stream error - see GetStreamError()
+    ERROR_VERSION,          //!< XMPP version error
+    ERROR_UNAUTHORIZED,     //!< User is not authorized (rejected credentials)
+    ERROR_TLS,              //!< TLS could not be negotiated
+    ERROR_AUTH,             //!< Authentication could not be negotiated
+    ERROR_BIND,             //!< Resource or session binding could not be negotiated
+    ERROR_CONNECTION_CLOSED,//!< Connection closed by output handler.
+    ERROR_DOCUMENT_CLOSED,  //!< Closed by </stream:stream>
+    ERROR_SOCKET,           //!< Socket error
+    ERROR_NETWORK_TIMEOUT,  //!< Some sort of timeout (eg., we never got the roster)
+    ERROR_MISSING_USERNAME  //!< User has a Google Account but no nickname
+  };
+
+  //! States.  See GetState().
+  enum State {
+    STATE_NONE = 0,        //!< Nonexistent state
+    STATE_START,           //!< Initial state.
+    STATE_OPENING,         //!< Exchanging stream headers, authenticating and so on.
+    STATE_OPEN,            //!< Authenticated and bound.
+    STATE_CLOSED,          //!< Session closed, possibly due to error.
+  };
+
+  // SOCKET INPUT AND OUTPUT ------------------------------------------------
+
+  //! Registers the handler for socket output
+  virtual XmppReturnStatus SetOutputHandler(XmppOutputHandler *pxoh) = 0;
+
+  //! Provides socket input to the engine
+  virtual XmppReturnStatus HandleInput(const char * bytes, size_t len) = 0;
+
+  //! Advises the engine that the socket has closed
+  virtual XmppReturnStatus ConnectionClosed(int subcode) = 0;
+
+  // SESSION SETUP ---------------------------------------------------------
+
+  //! Indicates the (bare) JID for the user to use.
+  virtual XmppReturnStatus SetUser(const Jid & jid)= 0;
+
+  //! Get the login (bare) JID.
+  virtual const Jid & GetUser() = 0;
+
+  //! Provides different methods for credentials for login.
+  //! Takes ownership of this object; deletes when login is done
+  virtual XmppReturnStatus SetSaslHandler(SaslHandler * h) = 0;
+
+  //! Sets whether TLS will be used within the connection (default true).
+  virtual XmppReturnStatus SetTls(TlsOptions useTls) = 0;
+
+  //! Sets an alternate domain from which we allows TLS certificates.
+  //! This is for use in the case where a we want to allow a proxy to
+  //! serve up its own certificate rather than one owned by the underlying
+  //! domain.
+  virtual XmppReturnStatus SetTlsServer(const std::string & proxy_hostname, 
+                                        const std::string & proxy_domain) = 0;
+
+  //! Gets whether TLS will be used within the connection.
+  virtual TlsOptions GetTls() = 0;
+
+  //! Sets the request resource name, if any (optional).
+  //! Note that the resource name may be overridden by the server; after
+  //! binding, the actual resource name is available as part of FullJid().
+  virtual XmppReturnStatus SetRequestedResource(const std::string& resource) = 0;
+
+  //! Gets the request resource name.
+  virtual const std::string & GetRequestedResource() = 0;
+
+  //! Sets language
+  virtual void SetLanguage(const std::string & lang) = 0;
+
+  // SESSION MANAGEMENT ---------------------------------------------------
+
+  //! Set callback for state changes.
+  virtual XmppReturnStatus SetSessionHandler(XmppSessionHandler* handler) = 0;
+
+  //! Initiates the XMPP connection.
+  //! After supplying connection settings, call this once to initiate,
+  //! (optionally) encrypt, authenticate, and bind the connection.
+  virtual XmppReturnStatus Connect() = 0;
+
+  //! The current engine state.
+  virtual State GetState() = 0;
+
+  //! Returns true if the connection is encrypted (under TLS)
+  virtual bool IsEncrypted() = 0;
+
+  //! The error code.
+  //! Consult this after XmppOutputHandler.OnClose().
+  virtual Error GetError(int *subcode) = 0;
+
+  //! The stream:error stanza, when the error is XmppEngine::ERROR_STREAM.
+  //! Notice the stanza returned is owned by the XmppEngine and
+  //! is deleted when the engine is destroyed.
+  virtual const XmlElement * GetStreamError() = 0;
+
+  //! Closes down the connection.
+  //! Sends CloseConnection to output, and disconnects and registered
+  //! session handlers.  After Disconnect completes, it is guaranteed
+  //! that no further callbacks will be made.
+  virtual XmppReturnStatus Disconnect() = 0;
+
+  // APPLICATION USE -------------------------------------------------------
+
+  enum HandlerLevel {
+    HL_NONE = 0,
+    HL_PEEK,   //!< Sees messages before all other processing; cannot abort
+    HL_SINGLE, //!< Watches for a single message, e.g., by id and sender
+    HL_SENDER, //!< Watches for a type of message from a specific sender
+    HL_TYPE,   //!< Watches a type of message, e.g., all groupchat msgs
+    HL_ALL,    //!< Watches all messages - gets last shot
+    HL_COUNT,  //!< Count of handler levels
+  };
+
+  //! Adds a listener for session events.
+  //! Stanza delivery is chained to session handlers; the first to
+  //! return 'true' is the last to get each stanza.
+  virtual XmppReturnStatus AddStanzaHandler(XmppStanzaHandler* handler, HandlerLevel level = HL_PEEK) = 0;
+
+  //! Removes a listener for session events.
+  virtual XmppReturnStatus RemoveStanzaHandler(XmppStanzaHandler* handler) = 0;
+
+  //! Sends a stanza to the server.
+  virtual XmppReturnStatus SendStanza(const XmlElement * pelStanza) = 0;
+
+  //! Sends raw text to the server
+  virtual XmppReturnStatus SendRaw(const std::string & text) = 0;
+
+  //! Sends an iq to the server, and registers a callback for the result.
+  //! Returns the cookie passed to the result handler.
+  virtual XmppReturnStatus SendIq(const XmlElement* pelStanza,
+                                  XmppIqHandler* iq_handler,
+                                  XmppIqCookie* cookie) = 0;
+
+  //! Unregisters an iq callback handler given its cookie.
+  //! No callback will come to this handler after it's unregistered.
+  virtual XmppReturnStatus RemoveIqHandler(XmppIqCookie cookie,
+                                      XmppIqHandler** iq_handler) = 0;
+
+
+  //! Forms and sends an error in response to the given stanza.
+  //! Swaps to and from, sets type to "error", and adds error information
+  //! based on the passed code.  Text is optional and may be STR_EMPTY.
+  virtual XmppReturnStatus SendStanzaError(const XmlElement * pelOriginal,
+                                           XmppStanzaError code,
+                                           const std::string & text) = 0;
+
+  //! The fullly bound JID.
+  //! This JID is only valid after binding has succeeded.  If the value
+  //! is JID_NULL, the binding has not succeeded.
+  virtual const Jid & FullJid() = 0;
+
+  //! The next unused iq id for this connection.
+  //! Call this when building iq stanzas, to ensure that each iq
+  //! gets its own unique id.
+  virtual std::string NextId() = 0;
+
+};
+
+}
+
+
+// Move these to a better location
+
+#define XMPP_FAILED(x)                      \
+  ( (x) == buzz::XMPP_RETURN_OK ? false : true)   \
+
+
+#define XMPP_SUCCEEDED(x)                   \
+  ( (x) == buzz::XMPP_RETURN_OK ? true : false)   \
+
+#define IFR(x)                        \
+  do {                                \
+    xmpp_status = (x);                \
+    if (XMPP_FAILED(xmpp_status)) {   \
+      return xmpp_status;             \
+    }                                 \
+  } while (false)                     \
+
+
+#define IFC(x)                        \
+  do {                                \
+    xmpp_status = (x);                \
+    if (XMPP_FAILED(xmpp_status)) {   \
+      goto Cleanup;                   \
+    }                                 \
+  } while (false)                     \
+
+
+#endif  // WEBRTC_LIBJINGLE_XMPP_XMPPENGINE_H_