text: /*
   * libjingle
   * Copyright 2004--2006, Google Inc.
   *
   * Redistribution and use in source and binary forms, with or without 
   * modification, are permitted provided that the following conditions are met:
   *
   *  1. Redistributions of source code must retain the above copyright notice, 
   *     this list of conditions and the following disclaimer.
   *  2. Redistributions in binary form must reproduce the above copyright notice,
   *     this list of conditions and the following disclaimer in the documentation
   *     and/or other materials provided with the distribution.
   *  3. The name of the author may not be used to endorse or promote products 
   *     derived from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
   * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
   * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
   * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 
   * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
   * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #include "talk/xmpp/xmpptask.h"
  #include "talk/xmpp/xmppclient.h"
  #include "talk/xmpp/xmppengine.h"
  #include "talk/xmpp/constants.h"
  #include "talk/xmpp/ratelimitmanager.h"
  
  namespace buzz {
  
  RateLimitManager task_rate_manager;
  
  XmppClientInterface::XmppClientInterface() {
  }
  
  XmppClientInterface::~XmppClientInterface() {
  }
  
  XmppTask::XmppTask(XmppTaskParentInterface* parent,
                     XmppEngine::HandlerLevel level)
      : XmppTaskBase(parent), stopped_(false) {
  #ifdef _DEBUG
    debug_force_timeout_ = false;
  #endif
  
    id_ = GetClient()->NextId();
    GetClient()->AddXmppTask(this, level);
    GetClient()->SignalDisconnected.connect(this, &XmppTask::OnDisconnect);
  }
  
  XmppTask::~XmppTask() {
    StopImpl();
  }
  
  void XmppTask::StopImpl() {
    while (NextStanza() != NULL) {}
    if (!stopped_) {
      GetClient()->RemoveXmppTask(this);
      GetClient()->SignalDisconnected.disconnect(this);
      stopped_ = true;
    }
  }
  
  XmppReturnStatus XmppTask::SendStanza(const XmlElement* stanza) {
    if (stopped_)
      return XMPP_RETURN_BADSTATE;
    return GetClient()->SendStanza(stanza);
  }
  
  XmppReturnStatus XmppTask::SendStanzaError(const XmlElement* element_original,
                                             XmppStanzaError code,
                                             const std::string& text) {
    if (stopped_)
      return XMPP_RETURN_BADSTATE;
    return GetClient()->SendStanzaError(element_original, code, text);
  }
  
  void XmppTask::Stop() {
    StopImpl();
    Task::Stop();
  }
  
  void XmppTask::OnDisconnect() {
    Error();
  }
  
  void XmppTask::QueueStanza(const XmlElement* stanza) {
  #ifdef _DEBUG
    if (debug_force_timeout_)
      return;
  #endif
  
    stanza_queue_.push_back(new XmlElement(*stanza));
    Wake();
  }
  
  const XmlElement* XmppTask::NextStanza() {
    XmlElement* result = NULL;
    if (!stanza_queue_.empty()) {
      result = stanza_queue_.front();
      stanza_queue_.pop_front();
    }
    next_stanza_.reset(result);
    return result;
  }
  
  XmlElement* XmppTask::MakeIq(const std::string& type,
                               const buzz::Jid& to,
                               const std::string& id) {
    XmlElement* result = new XmlElement(QN_IQ);
    if (!type.empty())
      result->AddAttr(QN_TYPE, type);
    if (!to.IsEmpty())
      result->AddAttr(QN_TO, to.Str());
    if (!id.empty())
      result->AddAttr(QN_ID, id);
    return result;
  }
  
  XmlElement* XmppTask::MakeIqResult(const XmlElement * query) {
    XmlElement* result = new XmlElement(QN_IQ);
    result->AddAttr(QN_TYPE, STR_RESULT);
    if (query->HasAttr(QN_FROM)) {
      result->AddAttr(QN_TO, query->Attr(QN_FROM));
    }
    result->AddAttr(QN_ID, query->Attr(QN_ID));
    return result;
  }
  
  bool XmppTask::MatchResponseIq(const XmlElement* stanza,
                                 const Jid& to,
                                 const std::string& id) {
    if (stanza->Name() != QN_IQ)
      return false;
  
    if (stanza->Attr(QN_ID) != id)
      return false;
  
    return MatchStanzaFrom(stanza, to);
  }
  
  bool XmppTask::MatchStanzaFrom(const XmlElement* stanza,
                                 const Jid& to) {
    Jid from(stanza->Attr(QN_FROM));
    if (from == to)
      return true;
  
    // We address the server as "", check if we are doing so here.
    if (!to.IsEmpty())
      return false;
  
    // It is legal for the server to identify itself with "domain" or
    // "myself@domain"
    Jid me = GetClient()->jid();
    return (from == Jid(me.domain())) || (from == me.BareJid());
  }
  
  bool XmppTask::MatchRequestIq(const XmlElement* stanza,
                                const std::string& type,
                                const QName& qn) {
    if (stanza->Name() != QN_IQ)
      return false;
  
    if (stanza->Attr(QN_TYPE) != type)
      return false;
  
    if (stanza->FirstNamed(qn) == NULL)
      return false;
  
    return true;
  }
  
  bool XmppTask::VerifyTaskRateLimit(const std::string task_name, int max_count, 
                                     int per_x_seconds) {
    return task_rate_manager.VerifyRateLimit(task_name, max_count, 
                                             per_x_seconds);
  }
  
  }
  