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

webrtc/libjingle/xmpp/xmppengineimpl.cc

+/*
+ *  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.
+ */
+
+#include "webrtc/libjingle/xmpp/xmppengineimpl.h"
+
+#include <algorithm>
+#include <sstream>
+#include <vector>
+
+#include "webrtc/libjingle/xmllite/xmlelement.h"
+#include "webrtc/libjingle/xmllite/xmlprinter.h"
+#include "webrtc/libjingle/xmpp/constants.h"
+#include "webrtc/libjingle/xmpp/saslhandler.h"
+#include "webrtc/libjingle/xmpp/xmpplogintask.h"
+#include "webrtc/base/common.h"
+
+namespace buzz {
+
+XmppEngine* XmppEngine::Create() {
+  return new XmppEngineImpl();
+}
+
+
+XmppEngineImpl::XmppEngineImpl()
+    : stanza_parse_handler_(this),
+      stanza_parser_(&stanza_parse_handler_),
+      engine_entered_(0),
+      password_(),
+      requested_resource_(STR_EMPTY),
+      tls_option_(buzz::TLS_REQUIRED),
+      login_task_(new XmppLoginTask(this)),
+      next_id_(0),
+      state_(STATE_START),
+      encrypted_(false),
+      error_code_(ERROR_NONE),
+      subcode_(0),
+      stream_error_(),
+      raised_reset_(false),
+      output_handler_(NULL),
+      session_handler_(NULL),
+      iq_entries_(new IqEntryVector()),
+      sasl_handler_(),
+      output_(new std::stringstream()) {
+  for (int i = 0; i < HL_COUNT; i+= 1) {
+    stanza_handlers_[i].reset(new StanzaHandlerVector());
+  }
+
+  // Add XMPP namespaces to XML namespaces stack.
+  xmlns_stack_.AddXmlns("stream", "http://etherx.jabber.org/streams");
+  xmlns_stack_.AddXmlns("", "jabber:client");
+}
+
+XmppEngineImpl::~XmppEngineImpl() {
+  DeleteIqCookies();
+}
+
+XmppReturnStatus XmppEngineImpl::SetOutputHandler(
+    XmppOutputHandler* output_handler) {
+  if (state_ != STATE_START)
+    return XMPP_RETURN_BADSTATE;
+
+  output_handler_ = output_handler;
+
+  return XMPP_RETURN_OK;
+}
+
+XmppReturnStatus XmppEngineImpl::SetSessionHandler(
+    XmppSessionHandler* session_handler) {
+  if (state_ != STATE_START)
+    return XMPP_RETURN_BADSTATE;
+
+  session_handler_ = session_handler;
+
+  return XMPP_RETURN_OK;
+}
+
+XmppReturnStatus XmppEngineImpl::HandleInput(
+    const char* bytes, size_t len) {
+  if (state_ < STATE_OPENING || state_ > STATE_OPEN)
+    return XMPP_RETURN_BADSTATE;
+
+  EnterExit ee(this);
+
+  // TODO: The return value of the xml parser is not checked.
+  stanza_parser_.Parse(bytes, len, false);
+
+  return XMPP_RETURN_OK;
+}
+
+XmppReturnStatus XmppEngineImpl::ConnectionClosed(int subcode) {
+  if (state_ != STATE_CLOSED) {
+    EnterExit ee(this);
+    // If told that connection closed and not already closed,
+    // then connection was unpexectedly dropped.
+    if (subcode) {
+      SignalError(ERROR_SOCKET, subcode);
+    } else {
+      SignalError(ERROR_CONNECTION_CLOSED, 0);  // no subcode
+    }
+  }
+  return XMPP_RETURN_OK;
+}
+
+XmppReturnStatus XmppEngineImpl::SetTls(TlsOptions use_tls) {
+  if (state_ != STATE_START)
+    return XMPP_RETURN_BADSTATE;
+  tls_option_ = use_tls;
+  return XMPP_RETURN_OK;
+}
+
+XmppReturnStatus XmppEngineImpl::SetTlsServer(
+    const std::string& tls_server_hostname,
+    const std::string& tls_server_domain) {
+  if (state_ != STATE_START)
+    return XMPP_RETURN_BADSTATE;
+
+  tls_server_hostname_ = tls_server_hostname;
+  tls_server_domain_= tls_server_domain;
+
+  return XMPP_RETURN_OK;
+}
+
+TlsOptions XmppEngineImpl::GetTls() {
+  return tls_option_;
+}
+
+XmppReturnStatus XmppEngineImpl::SetUser(const Jid& jid) {
+  if (state_ != STATE_START)
+    return XMPP_RETURN_BADSTATE;
+
+  user_jid_ = jid;
+
+  return XMPP_RETURN_OK;
+}
+
+const Jid& XmppEngineImpl::GetUser() {
+  return user_jid_;
+}
+
+XmppReturnStatus XmppEngineImpl::SetSaslHandler(SaslHandler* sasl_handler) {
+  if (state_ != STATE_START)
+    return XMPP_RETURN_BADSTATE;
+
+  sasl_handler_.reset(sasl_handler);
+  return XMPP_RETURN_OK;
+}
+
+XmppReturnStatus XmppEngineImpl::SetRequestedResource(
+    const std::string& resource) {
+  if (state_ != STATE_START)
+    return XMPP_RETURN_BADSTATE;
+
+  requested_resource_ = resource;
+
+  return XMPP_RETURN_OK;
+}
+
+const std::string& XmppEngineImpl::GetRequestedResource() {
+  return requested_resource_;
+}
+
+XmppReturnStatus XmppEngineImpl::AddStanzaHandler(
+    XmppStanzaHandler* stanza_handler,
+    XmppEngine::HandlerLevel level) {
+  if (state_ == STATE_CLOSED)
+    return XMPP_RETURN_BADSTATE;
+
+  stanza_handlers_[level]->push_back(stanza_handler);
+
+  return XMPP_RETURN_OK;
+}
+
+XmppReturnStatus XmppEngineImpl::RemoveStanzaHandler(
+    XmppStanzaHandler* stanza_handler) {
+  bool found = false;
+
+  for (int level = 0; level < HL_COUNT; level += 1) {
+    StanzaHandlerVector::iterator new_end =
+      std::remove(stanza_handlers_[level]->begin(),
+      stanza_handlers_[level]->end(),
+      stanza_handler);
+
+    if (new_end != stanza_handlers_[level]->end()) {
+      stanza_handlers_[level]->erase(new_end, stanza_handlers_[level]->end());
+      found = true;
+    }
+  }
+
+  if (!found)
+    return XMPP_RETURN_BADARGUMENT;
+
+  return XMPP_RETURN_OK;
+}
+
+XmppReturnStatus XmppEngineImpl::Connect() {
+  if (state_ != STATE_START)
+    return XMPP_RETURN_BADSTATE;
+
+  EnterExit ee(this);
+
+  // get the login task started
+  state_ = STATE_OPENING;
+  if (login_task_) {
+    login_task_->IncomingStanza(NULL, false);
+    if (login_task_->IsDone())
+      login_task_.reset();
+  }
+
+  return XMPP_RETURN_OK;
+}
+
+XmppReturnStatus XmppEngineImpl::SendStanza(const XmlElement* element) {
+  if (state_ == STATE_CLOSED)
+    return XMPP_RETURN_BADSTATE;
+
+  EnterExit ee(this);
+
+  if (login_task_) {
+    // still handshaking - then outbound stanzas are queued
+    login_task_->OutgoingStanza(element);
+  } else {
+    // handshake done - send straight through
+    InternalSendStanza(element);
+  }
+
+  return XMPP_RETURN_OK;
+}
+
+XmppReturnStatus XmppEngineImpl::SendRaw(const std::string& text) {
+  if (state_ == STATE_CLOSED || login_task_)
+    return XMPP_RETURN_BADSTATE;
+
+  EnterExit ee(this);
+
+  (*output_) << text;
+
+  return XMPP_RETURN_OK;
+}
+
+std::string XmppEngineImpl::NextId() {
+  std::stringstream ss;
+  ss << next_id_++;
+  return ss.str();
+}
+
+XmppReturnStatus XmppEngineImpl::Disconnect() {
+  if (state_ != STATE_CLOSED) {
+    EnterExit ee(this);
+    if (state_ == STATE_OPEN)
+      *output_ << "</stream:stream>";
+    state_ = STATE_CLOSED;
+  }
+
+  return XMPP_RETURN_OK;
+}
+
+void XmppEngineImpl::IncomingStart(const XmlElement* start) {
+  if (HasError() || raised_reset_)
+    return;
+
+  if (login_task_) {
+    // start-stream should go to login task
+    login_task_->IncomingStanza(start, true);
+    if (login_task_->IsDone())
+      login_task_.reset();
+  }
+  else {
+    // if not logging in, it's an error to see a start
+    SignalError(ERROR_XML, 0);
+  }
+}
+
+void XmppEngineImpl::IncomingStanza(const XmlElement* stanza) {
+  if (HasError() || raised_reset_)
+    return;
+
+  if (stanza->Name() == QN_STREAM_ERROR) {
+    // Explicit XMPP stream error
+    SignalStreamError(stanza);
+  } else if (login_task_) {
+    // Handle login handshake
+    login_task_->IncomingStanza(stanza, false);
+    if (login_task_->IsDone())
+      login_task_.reset();
+  } else if (HandleIqResponse(stanza)) {
+    // iq is handled by above call
+  } else {
+    // give every "peek" handler a shot at all stanzas
+    for (size_t i = 0; i < stanza_handlers_[HL_PEEK]->size(); i += 1) {
+      (*stanza_handlers_[HL_PEEK])[i]->HandleStanza(stanza);
+    }
+
+    // give other handlers a shot in precedence order, stopping after handled
+    for (int level = HL_SINGLE; level <= HL_ALL; level += 1) {
+      for (size_t i = 0; i < stanza_handlers_[level]->size(); i += 1) {
+        if ((*stanza_handlers_[level])[i]->HandleStanza(stanza))
+          return;
+      }
+    }
+
+    // If nobody wants to handle a stanza then send back an error.
+    // Only do this for IQ stanzas as messages should probably just be dropped
+    // and presence stanzas should certainly be dropped.
+    std::string type = stanza->Attr(QN_TYPE);
+    if (stanza->Name() == QN_IQ &&
+        !(type == "error" || type == "result")) {
+      SendStanzaError(stanza, XSE_FEATURE_NOT_IMPLEMENTED, STR_EMPTY);
+    }
+  }
+}
+
+void XmppEngineImpl::IncomingEnd(bool isError) {
+  if (HasError() || raised_reset_)
+    return;
+
+  SignalError(isError ? ERROR_XML : ERROR_DOCUMENT_CLOSED, 0);
+}
+
+void XmppEngineImpl::InternalSendStart(const std::string& to) {
+  std::string hostname = tls_server_hostname_;
+  if (hostname.empty())
+    hostname = to;
+
+  // If not language is specified, the spec says use *
+  std::string lang = lang_;
+  if (lang.length() == 0)
+    lang = "*";
+
+  // send stream-beginning
+  // note, we put a \r\n at tne end fo the first line to cause non-XMPP
+  // line-oriented servers (e.g., Apache) to reveal themselves more quickly.
+  *output_ << "<stream:stream to=\"" << hostname << "\" "
+           << "xml:lang=\"" << lang << "\" "
+           << "version=\"1.0\" "
+           << "xmlns:stream=\"http://etherx.jabber.org/streams\" "
+           << "xmlns=\"jabber:client\">\r\n";
+}
+
+void XmppEngineImpl::InternalSendStanza(const XmlElement* element) {
+  // It should really never be necessary to set a FROM attribute on a stanza.
+  // It is implied by the bind on the stream and if you get it wrong
+  // (by flipping from/to on a message?) the server will close the stream.
+  ASSERT(!element->HasAttr(QN_FROM));
+
+  XmlPrinter::PrintXml(output_.get(), element, &xmlns_stack_);
+}
+
+std::string XmppEngineImpl::ChooseBestSaslMechanism(
+    const std::vector<std::string>& mechanisms, bool encrypted) {
+  return sasl_handler_->ChooseBestSaslMechanism(mechanisms, encrypted);
+}
+
+SaslMechanism* XmppEngineImpl::GetSaslMechanism(const std::string& name) {
+  return sasl_handler_->CreateSaslMechanism(name);
+}
+
+void XmppEngineImpl::SignalBound(const Jid& fullJid) {
+  if (state_ == STATE_OPENING) {
+    bound_jid_ = fullJid;
+    state_ = STATE_OPEN;
+  }
+}
+
+void XmppEngineImpl::SignalStreamError(const XmlElement* stream_error) {
+  if (state_ != STATE_CLOSED) {
+    stream_error_.reset(new XmlElement(*stream_error));
+    SignalError(ERROR_STREAM, 0);
+  }
+}
+
+void XmppEngineImpl::SignalError(Error error_code, int sub_code) {
+  if (state_ != STATE_CLOSED) {
+    error_code_ = error_code;
+    subcode_ = sub_code;
+    state_ = STATE_CLOSED;
+  }
+}
+
+bool XmppEngineImpl::HasError() {
+  return error_code_ != ERROR_NONE;
+}
+
+void XmppEngineImpl::StartTls(const std::string& domain) {
+  if (output_handler_) {
+    // As substitute for the real (login jid's) domain, we permit
+    // verifying a tls_server_domain_ instead, if one was passed.
+    // This allows us to avoid running a proxy that needs to handle
+    // valuable certificates.
+    output_handler_->StartTls(
+      tls_server_domain_.empty() ? domain : tls_server_domain_);
+    encrypted_ = true;
+  }
+}
+
+XmppEngineImpl::EnterExit::EnterExit(XmppEngineImpl* engine)
+    : engine_(engine),
+      state_(engine->state_) {
+  engine->engine_entered_ += 1;
+}
+
+XmppEngineImpl::EnterExit::~EnterExit()  {
+ XmppEngineImpl* engine = engine_;
+
+ engine->engine_entered_ -= 1;
+
+ bool closing = (engine->state_ != state_ &&
+       engine->state_ == STATE_CLOSED);
+ bool flushing = closing || (engine->engine_entered_ == 0);
+
+ if (engine->output_handler_ && flushing) {
+   std::string output = engine->output_->str();
+   if (output.length() > 0)
+     engine->output_handler_->WriteOutput(output.c_str(), output.length());
+   engine->output_->str("");
+
+   if (closing) {
+     engine->output_handler_->CloseConnection();
+     engine->output_handler_ = 0;
+   }
+ }
+
+ if (engine->engine_entered_)
+   return;
+
+ if (engine->raised_reset_) {
+   engine->stanza_parser_.Reset();
+   engine->raised_reset_ = false;
+ }
+
+ if (engine->session_handler_) {
+   if (engine->state_ != state_)
+     engine->session_handler_->OnStateChange(engine->state_);
+   // Note: Handling of OnStateChange(CLOSED) should allow for the
+   // deletion of the engine, so no members should be accessed
+   // after this line.
+ }
+}
+
+}  // namespace buzz