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

webrtc/libjingle/xmpp/chatroommoduleimpl.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 <algorithm>
+#include <iostream>
+#include <map>
+#include <memory>
+#include <sstream>
+#include <string>
+#include <vector>
+#include "webrtc/libjingle/xmpp/chatroommodule.h"
+#include "webrtc/libjingle/xmpp/constants.h"
+#include "webrtc/libjingle/xmpp/moduleimpl.h"
+#include "webrtc/base/arraysize.h"
+#include "webrtc/base/common.h"
+
+namespace buzz {
+
+// forward declarations
+class XmppChatroomImpl;
+class XmppChatroomMemberImpl;
+
+//! Module that encapsulates multiple chatrooms.
+//! Each chatroom is represented by an XmppChatroomImpl instance
+class XmppChatroomModuleImpl : public XmppChatroomModule,
+  public XmppModuleImpl, public XmppIqHandler {
+public:
+  IMPLEMENT_XMPPMODULE
+
+   // Creates a chatroom with specified Jid
+  XmppChatroomModuleImpl();
+  ~XmppChatroomModuleImpl();
+
+  // XmppChatroomModule
+  virtual XmppReturnStatus set_chatroom_handler(XmppChatroomHandler* handler);
+  virtual XmppChatroomHandler* chatroom_handler();
+  virtual XmppReturnStatus set_chatroom_jid(const Jid& chatroom_jid);
+  virtual const Jid& chatroom_jid() const;
+  virtual XmppReturnStatus set_nickname(const std::string& nickname);
+  virtual const std::string& nickname() const;
+  virtual const Jid member_jid() const;
+  virtual XmppReturnStatus RequestEnterChatroom(const std::string& password,
+      const std::string& client_version,
+      const std::string& locale);
+  virtual XmppReturnStatus RequestExitChatroom();
+  virtual XmppReturnStatus RequestConnectionStatusChange(
+      XmppPresenceConnectionStatus connection_status);
+  virtual size_t GetChatroomMemberCount();
+  virtual XmppReturnStatus CreateMemberEnumerator(XmppChatroomMemberEnumerator** enumerator);
+  virtual const std::string subject();
+  virtual XmppChatroomState state() { return chatroom_state_; }
+  virtual XmppReturnStatus SendMessage(const XmlElement& message);
+
+  // XmppModule
+  virtual void IqResponse(XmppIqCookie cookie, const XmlElement * pelStanza) {RTC_UNUSED2(cookie, pelStanza);}
+  virtual bool HandleStanza(const XmlElement *);
+
+private:
+  friend class XmppChatroomMemberEnumeratorImpl;
+
+  XmppReturnStatus ServerChangeMyPresence(const XmlElement& presence);
+  XmppReturnStatus ClientChangeMyPresence(XmppChatroomState new_state);
+  XmppReturnStatus ChangePresence(XmppChatroomState new_state, const XmlElement* presence, bool isServer);
+  XmppReturnStatus ServerChangedOtherPresence(const XmlElement& presence_element);
+  XmppChatroomEnteredStatus GetEnterFailureFromXml(const XmlElement* presence);
+  XmppChatroomExitedStatus GetExitFailureFromXml(const XmlElement* presence);
+
+  bool CheckEnterChatroomStateOk();
+
+  void FireEnteredStatus(const XmlElement* presence,
+                         XmppChatroomEnteredStatus status);
+  void FireExitStatus(XmppChatroomExitedStatus status);
+  void FireMessageReceived(const XmlElement& message);
+  void FireMemberEntered(const XmppChatroomMember* entered_member);
+  void FireMemberChanged(const XmppChatroomMember* changed_member);
+  void FireMemberExited(const XmppChatroomMember* exited_member);
+
+
+  typedef std::map<Jid, XmppChatroomMemberImpl*> JidMemberMap;
+
+  XmppChatroomHandler*              chatroom_handler_;
+  Jid                               chatroom_jid_;
+  std::string                       nickname_;
+  XmppChatroomState                 chatroom_state_;
+  JidMemberMap                      chatroom_jid_members_;
+  int                               chatroom_jid_members_version_;
+};
+
+
+class XmppChatroomMemberImpl : public XmppChatroomMember {
+public:
+  ~XmppChatroomMemberImpl() {}
+  XmppReturnStatus SetPresence(const XmppPresence* presence);
+
+  // XmppChatroomMember
+  const Jid member_jid() const;
+  const Jid full_jid() const;
+  const std::string name() const;
+  const XmppPresence* presence() const;
+
+private:
+  std::unique_ptr<XmppPresence>  presence_;
+};
+
+class XmppChatroomMemberEnumeratorImpl :
+        public XmppChatroomMemberEnumerator  {
+public:
+  XmppChatroomMemberEnumeratorImpl(XmppChatroomModuleImpl::JidMemberMap* chatroom_jid_members,
+                                        int* map_version);
+
+  // XmppChatroomMemberEnumerator
+  virtual XmppChatroomMember* current();
+  virtual bool Next();
+  virtual bool Prev();
+  virtual bool IsValid();
+  virtual bool IsBeforeBeginning();
+  virtual bool IsAfterEnd();
+
+private:
+  XmppChatroomModuleImpl::JidMemberMap*           map_;
+  int                                             map_version_created_;
+  int*                                            map_version_;
+  XmppChatroomModuleImpl::JidMemberMap::iterator  iterator_;
+  bool                                            before_beginning_;
+};
+
+
+// XmppChatroomModuleImpl ------------------------------------------------
+XmppChatroomModule *
+XmppChatroomModule::Create() {
+  return new XmppChatroomModuleImpl();
+}
+
+XmppChatroomModuleImpl::XmppChatroomModuleImpl() :
+  chatroom_handler_(NULL),
+  chatroom_jid_(STR_EMPTY),
+  chatroom_state_(XMPP_CHATROOM_STATE_NOT_IN_ROOM),
+  chatroom_jid_members_version_(0) {
+}
+
+XmppChatroomModuleImpl::~XmppChatroomModuleImpl() {
+  JidMemberMap::iterator iterator = chatroom_jid_members_.begin();
+  while (iterator != chatroom_jid_members_.end()) {
+    delete iterator->second;
+    iterator++;
+  }
+}
+
+
+bool
+XmppChatroomModuleImpl::HandleStanza(const XmlElement* stanza) {
+  ASSERT(engine() != NULL);
+
+  // we handle stanzas that are for one of our chatrooms
+  Jid from_jid = Jid(stanza->Attr(QN_FROM));
+  // see if it's one of our chatrooms
+  if (chatroom_jid_ != from_jid.BareJid()) {
+    return false; // not one of our chatrooms
+  } else {
+    // handle presence stanza
+    if (stanza->Name() == QN_PRESENCE) {
+      if (from_jid == member_jid()) {
+        ServerChangeMyPresence(*stanza);
+      } else {
+        ServerChangedOtherPresence(*stanza);
+      }
+    } else if (stanza->Name() == QN_MESSAGE) {
+      FireMessageReceived(*stanza);
+    }
+    return true;
+  }
+}
+
+
+XmppReturnStatus
+XmppChatroomModuleImpl::set_chatroom_handler(XmppChatroomHandler* handler) {
+  // Calling with NULL removes the handler.
+  chatroom_handler_ = handler;
+  return XMPP_RETURN_OK;
+}
+
+
+XmppChatroomHandler*
+XmppChatroomModuleImpl::chatroom_handler() {
+  return chatroom_handler_;
+}
+
+XmppReturnStatus
+XmppChatroomModuleImpl::set_chatroom_jid(const Jid& chatroom_jid) {
+  if (chatroom_state_ != XMPP_CHATROOM_STATE_NOT_IN_ROOM) {
+    return XMPP_RETURN_BADSTATE; // $TODO - this isn't a bad state, it's a bad call,  diff error code?
+  }
+  if (chatroom_jid != chatroom_jid.BareJid()) {
+    // chatroom_jid must be a bare jid
+    return XMPP_RETURN_BADARGUMENT;
+  }
+
+  chatroom_jid_ = chatroom_jid;
+  return XMPP_RETURN_OK;
+}
+
+const Jid&
+XmppChatroomModuleImpl::chatroom_jid() const {
+  return chatroom_jid_;
+}
+
+ XmppReturnStatus
+ XmppChatroomModuleImpl::set_nickname(const std::string& nickname) {
+  if (chatroom_state_ != XMPP_CHATROOM_STATE_NOT_IN_ROOM) {
+    return XMPP_RETURN_BADSTATE; // $TODO - this isn't a bad state, it's a bad call,  diff error code?
+  }
+  nickname_ = nickname;
+  return XMPP_RETURN_OK;
+ }
+
+ const std::string&
+ XmppChatroomModuleImpl::nickname() const {
+  return nickname_;
+ }
+
+const Jid
+XmppChatroomModuleImpl::member_jid() const {
+  return Jid(chatroom_jid_.node(), chatroom_jid_.domain(), nickname_);
+}
+
+
+bool
+XmppChatroomModuleImpl::CheckEnterChatroomStateOk() {
+  if (chatroom_jid_.IsValid() == false) {
+    ASSERT(0);
+    return false;
+  }
+  if (nickname_ == STR_EMPTY) {
+    ASSERT(0);
+    return false;
+  }
+  return true;
+}
+
+std::string GetAttrValueFor(XmppPresenceConnectionStatus connection_status) {
+  switch (connection_status) {
+    default:
+    case XMPP_CONNECTION_STATUS_UNKNOWN:
+      return "";
+    case XMPP_CONNECTION_STATUS_CONNECTING:
+      return STR_PSTN_CONFERENCE_STATUS_CONNECTING;
+    case XMPP_CONNECTION_STATUS_CONNECTED:
+      return STR_PSTN_CONFERENCE_STATUS_CONNECTED;
+  }
+}
+
+XmppReturnStatus
+XmppChatroomModuleImpl::RequestEnterChatroom(
+    const std::string& password,
+    const std::string& client_version,
+    const std::string& locale) {
+  RTC_UNUSED(password);
+  if (!engine())
+    return XMPP_RETURN_BADSTATE;
+
+  if (chatroom_state_ != XMPP_CHATROOM_STATE_NOT_IN_ROOM)
+    return XMPP_RETURN_BADSTATE; // $TODO - this isn't a bad state, it's a bad call,  diff error code?
+
+  if (CheckEnterChatroomStateOk() == false) {
+    return XMPP_RETURN_BADSTATE;
+  }
+
+  // entering a chatroom is a presence request to the server
+  XmlElement element(QN_PRESENCE);
+  element.AddAttr(QN_TO, member_jid().Str());
+
+  XmlElement* muc_x = new XmlElement(QN_MUC_X);
+  element.AddElement(muc_x);
+
+  if (!client_version.empty()) {
+    XmlElement* client_version_element = new XmlElement(QN_CLIENT_VERSION,
+                                                        false);
+    client_version_element->SetBodyText(client_version);
+    muc_x->AddElement(client_version_element);
+  }
+
+  if (!locale.empty()) {
+    XmlElement* locale_element = new XmlElement(QN_LOCALE, false);
+
+    locale_element->SetBodyText(locale);
+    muc_x->AddElement(locale_element);
+  }
+
+  XmppReturnStatus status = engine()->SendStanza(&element);
+  if (status == XMPP_RETURN_OK) {
+    return ClientChangeMyPresence(XMPP_CHATROOM_STATE_REQUESTED_ENTER);
+  }
+  return status;
+}
+
+XmppReturnStatus
+XmppChatroomModuleImpl::RequestExitChatroom() {
+  if (!engine())
+    return XMPP_RETURN_BADSTATE;
+
+  // exiting a chatroom is a presence request to the server
+  XmlElement element(QN_PRESENCE);
+  element.AddAttr(QN_TO, member_jid().Str());
+  element.AddAttr(QN_TYPE, "unavailable");
+  XmppReturnStatus status = engine()->SendStanza(&element);
+  if (status == XMPP_RETURN_OK &&
+      chatroom_state_ == XMPP_CHATROOM_STATE_IN_ROOM) {
+    return ClientChangeMyPresence(XMPP_CHATROOM_STATE_REQUESTED_EXIT);
+  }
+  return status;
+}
+
+XmppReturnStatus
+XmppChatroomModuleImpl::RequestConnectionStatusChange(
+    XmppPresenceConnectionStatus connection_status) {
+  if (!engine())
+    return XMPP_RETURN_BADSTATE;
+
+  if (chatroom_state_ != XMPP_CHATROOM_STATE_IN_ROOM) {
+    // $TODO - this isn't a bad state, it's a bad call,  diff error code?
+    return XMPP_RETURN_BADSTATE;
+  }
+
+  if (CheckEnterChatroomStateOk() == false) {
+    return XMPP_RETURN_BADSTATE;
+  }
+
+  // entering a chatroom is a presence request to the server
+  XmlElement element(QN_PRESENCE);
+  element.AddAttr(QN_TO, member_jid().Str());
+  element.AddElement(new XmlElement(QN_MUC_X));
+  if (connection_status != XMPP_CONNECTION_STATUS_UNKNOWN) {
+    XmlElement* con_status_element =
+        new XmlElement(QN_GOOGLE_PSTN_CONFERENCE_STATUS);
+    con_status_element->AddAttr(QN_STATUS, GetAttrValueFor(connection_status));
+    element.AddElement(con_status_element);
+  }
+  XmppReturnStatus status = engine()->SendStanza(&element);
+
+  return status;
+}
+
+size_t
+XmppChatroomModuleImpl::GetChatroomMemberCount() {
+  return chatroom_jid_members_.size();
+}
+
+XmppReturnStatus
+XmppChatroomModuleImpl::CreateMemberEnumerator(XmppChatroomMemberEnumerator** enumerator) {
+  *enumerator = new XmppChatroomMemberEnumeratorImpl(&chatroom_jid_members_, &chatroom_jid_members_version_);
+  return XMPP_RETURN_OK;
+}
+
+const std::string
+XmppChatroomModuleImpl::subject() {
+  return ""; //NYI
+}
+
+XmppReturnStatus
+XmppChatroomModuleImpl::SendMessage(const XmlElement& message) {
+  XmppReturnStatus xmpp_status = XMPP_RETURN_OK;
+
+  // can only send a message if we're in the room
+  if (chatroom_state_ != XMPP_CHATROOM_STATE_IN_ROOM) {
+    return XMPP_RETURN_BADSTATE; // $TODO - this isn't a bad state, it's a bad call,  diff error code?
+  }
+
+  if (message.Name() != QN_MESSAGE) {
+    IFR(XMPP_RETURN_BADARGUMENT);
+  }
+
+  const std::string& type = message.Attr(QN_TYPE);
+  if (type != "groupchat") {
+    IFR(XMPP_RETURN_BADARGUMENT);
+  }
+
+  if (message.HasAttr(QN_FROM)) {
+    IFR(XMPP_RETURN_BADARGUMENT);
+  }
+
+  if (message.Attr(QN_TO) != chatroom_jid_.Str()) {
+    IFR(XMPP_RETURN_BADARGUMENT);
+  }
+
+  IFR(engine()->SendStanza(&message));
+
+  return xmpp_status;
+}
+
+enum TransitionType {
+  TRANSITION_TYPE_NONE                 = 0,
+  TRANSITION_TYPE_ENTER_SUCCESS        = 1,
+  TRANSITION_TYPE_ENTER_FAILURE        = 2,
+  TRANSITION_TYPE_EXIT_VOLUNTARILY     = 3,
+  TRANSITION_TYPE_EXIT_INVOLUNTARILY   = 4,
+};
+
+struct StateTransitionDescription {
+  XmppChatroomState old_state;
+  XmppChatroomState new_state;
+  bool              is_valid_server_transition;
+  bool              is_valid_client_transition;
+  TransitionType    transition_type;
+};
+
+StateTransitionDescription Transitions[] = {
+  { XMPP_CHATROOM_STATE_NOT_IN_ROOM,     XMPP_CHATROOM_STATE_REQUESTED_ENTER, false, true,  TRANSITION_TYPE_NONE, },
+  { XMPP_CHATROOM_STATE_NOT_IN_ROOM,     XMPP_CHATROOM_STATE_IN_ROOM,         false, false, TRANSITION_TYPE_ENTER_SUCCESS, },
+  { XMPP_CHATROOM_STATE_NOT_IN_ROOM,     XMPP_CHATROOM_STATE_REQUESTED_EXIT,  false, false, TRANSITION_TYPE_NONE, },
+  { XMPP_CHATROOM_STATE_REQUESTED_ENTER, XMPP_CHATROOM_STATE_NOT_IN_ROOM,     true,  false, TRANSITION_TYPE_ENTER_FAILURE, },
+  { XMPP_CHATROOM_STATE_REQUESTED_ENTER, XMPP_CHATROOM_STATE_IN_ROOM,         true,  false, TRANSITION_TYPE_ENTER_SUCCESS, },
+  { XMPP_CHATROOM_STATE_REQUESTED_ENTER, XMPP_CHATROOM_STATE_REQUESTED_EXIT,  false, false, TRANSITION_TYPE_NONE, },
+  { XMPP_CHATROOM_STATE_IN_ROOM,         XMPP_CHATROOM_STATE_NOT_IN_ROOM,     true,  false, TRANSITION_TYPE_EXIT_INVOLUNTARILY,  },
+  { XMPP_CHATROOM_STATE_IN_ROOM,         XMPP_CHATROOM_STATE_REQUESTED_ENTER, false, false, TRANSITION_TYPE_NONE, },
+  { XMPP_CHATROOM_STATE_IN_ROOM,         XMPP_CHATROOM_STATE_REQUESTED_EXIT,  false, true,  TRANSITION_TYPE_NONE, },
+  { XMPP_CHATROOM_STATE_REQUESTED_EXIT,  XMPP_CHATROOM_STATE_NOT_IN_ROOM,     true,  false, TRANSITION_TYPE_EXIT_VOLUNTARILY, },
+  { XMPP_CHATROOM_STATE_REQUESTED_EXIT,  XMPP_CHATROOM_STATE_REQUESTED_ENTER, false, false, TRANSITION_TYPE_NONE, },
+  { XMPP_CHATROOM_STATE_REQUESTED_EXIT,  XMPP_CHATROOM_STATE_IN_ROOM,         false, false, TRANSITION_TYPE_NONE, },
+};
+
+
+
+void
+XmppChatroomModuleImpl::FireEnteredStatus(const XmlElement* presence,
+                                          XmppChatroomEnteredStatus status) {
+  if (chatroom_handler_) {
+    std::unique_ptr<XmppPresence> xmpp_presence(XmppPresence::Create());
+    xmpp_presence->set_raw_xml(presence);
+    chatroom_handler_->ChatroomEnteredStatus(this, xmpp_presence.get(), status);
+  }
+}
+
+void
+XmppChatroomModuleImpl::FireExitStatus(XmppChatroomExitedStatus status) {
+  if (chatroom_handler_)
+    chatroom_handler_->ChatroomExitedStatus(this, status);
+}
+
+void
+XmppChatroomModuleImpl::FireMessageReceived(const XmlElement& message) {
+  if (chatroom_handler_)
+    chatroom_handler_->MessageReceived(this, message);
+}
+
+void
+XmppChatroomModuleImpl::FireMemberEntered(const XmppChatroomMember* entered_member) {
+  if (chatroom_handler_)
+    chatroom_handler_->MemberEntered(this, entered_member);
+}
+
+void
+XmppChatroomModuleImpl::FireMemberChanged(
+    const XmppChatroomMember* changed_member) {
+  if (chatroom_handler_)
+    chatroom_handler_->MemberChanged(this, changed_member);
+}
+
+void
+XmppChatroomModuleImpl::FireMemberExited(const XmppChatroomMember* exited_member) {
+  if (chatroom_handler_)
+    chatroom_handler_->MemberExited(this, exited_member);
+}
+
+
+XmppReturnStatus
+XmppChatroomModuleImpl::ServerChangedOtherPresence(const XmlElement&
+                                                   presence_element) {
+  XmppReturnStatus xmpp_status = XMPP_RETURN_OK;
+  std::unique_ptr<XmppPresence> presence(XmppPresence::Create());
+  IFR(presence->set_raw_xml(&presence_element));
+
+  JidMemberMap::iterator pos = chatroom_jid_members_.find(presence->jid());
+
+  if (pos == chatroom_jid_members_.end()) {
+    if (presence->available() == XMPP_PRESENCE_AVAILABLE) {
+      XmppChatroomMemberImpl* member = new XmppChatroomMemberImpl();
+      member->SetPresence(presence.get());
+      chatroom_jid_members_.insert(std::make_pair(member->member_jid(), member));
+      chatroom_jid_members_version_++;
+      FireMemberEntered(member);
+    }
+  } else {
+    XmppChatroomMemberImpl* member = pos->second;
+    if (presence->available() == XMPP_PRESENCE_AVAILABLE) {
+      member->SetPresence(presence.get());
+      chatroom_jid_members_version_++;
+      FireMemberChanged(member);
+    }
+    else if (presence->available() == XMPP_PRESENCE_UNAVAILABLE) {
+      member->SetPresence(presence.get());
+      chatroom_jid_members_.erase(pos);
+      chatroom_jid_members_version_++;
+      FireMemberExited(member);
+      delete member;
+    }
+  }
+
+  return xmpp_status;
+}
+
+XmppReturnStatus
+XmppChatroomModuleImpl::ClientChangeMyPresence(XmppChatroomState new_state) {
+  return ChangePresence(new_state, NULL, false);
+}
+
+XmppReturnStatus
+XmppChatroomModuleImpl::ServerChangeMyPresence(const XmlElement& presence) {
+   XmppChatroomState new_state;
+
+   if (presence.HasAttr(QN_TYPE) == false) {
+      new_state = XMPP_CHATROOM_STATE_IN_ROOM;
+   } else {
+     new_state = XMPP_CHATROOM_STATE_NOT_IN_ROOM;
+   }
+  return ChangePresence(new_state, &presence, true);
+
+}
+
+XmppReturnStatus
+XmppChatroomModuleImpl::ChangePresence(XmppChatroomState new_state,
+                                       const XmlElement* presence,
+                                       bool isServer) {
+  RTC_UNUSED(presence);
+
+  XmppChatroomState old_state = chatroom_state_;
+
+  // do nothing if state hasn't changed
+  if (old_state == new_state)
+    return XMPP_RETURN_OK;
+
+  // find the right transition description
+  StateTransitionDescription* transition_desc = NULL;
+  for (size_t i = 0; i < arraysize(Transitions); i++) {
+    if (Transitions[i].old_state == old_state &&
+        Transitions[i].new_state == new_state) {
+        transition_desc = &Transitions[i];
+        break;
+    }
+  }
+
+  if (transition_desc == NULL) {
+    ASSERT(0);
+    return XMPP_RETURN_BADSTATE;
+  }
+
+  // we assert for any invalid transition states, and we'll
+  if (isServer) {
+    // $TODO send original stanza back to server and log an error?
+    // Disable the assert because of b/6133072
+    // ASSERT(transition_desc->is_valid_server_transition);
+    if (!transition_desc->is_valid_server_transition) {
+      return XMPP_RETURN_BADSTATE;
+    }
+  } else {
+    if (transition_desc->is_valid_client_transition == false) {
+      ASSERT(0);
+      return XMPP_RETURN_BADARGUMENT;
+    }
+  }
+
+  // set the new state and then fire any notifications to the handler
+  chatroom_state_ = new_state;
+
+  switch (transition_desc->transition_type) {
+    case TRANSITION_TYPE_ENTER_SUCCESS:
+      FireEnteredStatus(presence, XMPP_CHATROOM_ENTERED_SUCCESS);
+      break;
+    case TRANSITION_TYPE_ENTER_FAILURE:
+      FireEnteredStatus(presence, GetEnterFailureFromXml(presence));
+      break;
+    case TRANSITION_TYPE_EXIT_INVOLUNTARILY:
+      FireExitStatus(GetExitFailureFromXml(presence));
+      break;
+    case TRANSITION_TYPE_EXIT_VOLUNTARILY:
+      FireExitStatus(XMPP_CHATROOM_EXITED_REQUESTED);
+      break;
+    case TRANSITION_TYPE_NONE:
+      break;
+  }
+
+  return XMPP_RETURN_OK;
+}
+
+XmppChatroomEnteredStatus
+XmppChatroomModuleImpl::GetEnterFailureFromXml(const XmlElement* presence) {
+  XmppChatroomEnteredStatus status = XMPP_CHATROOM_ENTERED_FAILURE_UNSPECIFIED;
+  const XmlElement* error = presence->FirstNamed(QN_ERROR);
+  if (error != NULL && error->HasAttr(QN_CODE)) {
+    int code = atoi(error->Attr(QN_CODE).c_str());
+    switch (code) {
+      case 401: status = XMPP_CHATROOM_ENTERED_FAILURE_PASSWORD_REQUIRED; break;
+      case 403: {
+        status = XMPP_CHATROOM_ENTERED_FAILURE_MEMBER_BANNED;
+        if (error->FirstNamed(QN_GOOGLE_SESSION_BLOCKED)) {
+          status = XMPP_CHATROOM_ENTERED_FAILURE_MEMBER_BLOCKED;
+        } else if (error->FirstNamed(QN_GOOGLE_SESSION_BLOCKING)) {
+          status = XMPP_CHATROOM_ENTERED_FAILURE_MEMBER_BLOCKING;
+        }
+        break;
+      }
+      case 405: status = XMPP_CHATROOM_ENTERED_FAILURE_ROOM_LOCKED; break;
+      case 406: status = XMPP_CHATROOM_ENTERED_FAILURE_OUTDATED_CLIENT; break;
+      case 407: status = XMPP_CHATROOM_ENTERED_FAILURE_NOT_A_MEMBER; break;
+      case 409: status = XMPP_CHATROOM_ENTERED_FAILURE_NICKNAME_CONFLICT; break;
+      // http://xmpp.org/extensions/xep-0045.html#enter-maxusers
+      case 503: status = XMPP_CHATROOM_ENTERED_FAILURE_MAX_USERS; break;
+    }
+  }
+  return status;
+}
+
+XmppChatroomExitedStatus
+XmppChatroomModuleImpl::GetExitFailureFromXml(const XmlElement* presence) {
+  XmppChatroomExitedStatus status = XMPP_CHATROOM_EXITED_UNSPECIFIED;
+  const XmlElement* muc_user = presence->FirstNamed(QN_MUC_USER_X);
+  if (muc_user != NULL) {
+    const XmlElement* user_status = muc_user->FirstNamed(QN_MUC_USER_STATUS);
+    if (user_status != NULL && user_status->HasAttr(QN_CODE)) {
+      int code = atoi(user_status->Attr(QN_CODE).c_str());
+      switch (code) {
+        case 307: status = XMPP_CHATROOM_EXITED_KICKED; break;
+        case 322: status = XMPP_CHATROOM_EXITED_NOT_A_MEMBER; break;
+        case 332: status = XMPP_CHATROOM_EXITED_SYSTEM_SHUTDOWN; break;
+      }
+    }
+  }
+  return status;
+}
+
+XmppReturnStatus
+XmppChatroomMemberImpl::SetPresence(const XmppPresence* presence) {
+  ASSERT(presence != NULL);
+
+  // copy presence
+  presence_.reset(XmppPresence::Create());
+  presence_->set_raw_xml(presence->raw_xml());
+  return XMPP_RETURN_OK;
+}
+
+const Jid
+XmppChatroomMemberImpl::member_jid() const {
+  return presence_->jid();
+}
+
+const Jid
+XmppChatroomMemberImpl::full_jid() const {
+  return Jid("");
+}
+
+const std::string
+XmppChatroomMemberImpl::name() const {
+  return member_jid().resource();
+}
+
+const XmppPresence*
+XmppChatroomMemberImpl::presence() const {
+  return presence_.get();
+}
+
+
+// XmppChatroomMemberEnumeratorImpl --------------------------------------
+XmppChatroomMemberEnumeratorImpl::XmppChatroomMemberEnumeratorImpl(
+        XmppChatroomModuleImpl::JidMemberMap* map, int* map_version) {
+  map_ = map;
+  map_version_ = map_version;
+  map_version_created_ = *map_version_;
+  iterator_ = map->begin();
+  before_beginning_ = true;
+}
+
+XmppChatroomMember*
+XmppChatroomMemberEnumeratorImpl::current() {
+  if (IsValid() == false) {
+    return NULL;
+  } else if (IsBeforeBeginning() || IsAfterEnd()) {
+    return NULL;
+  } else {
+    return iterator_->second;
+  }
+}
+
+bool
+XmppChatroomMemberEnumeratorImpl::Prev() {
+  if (IsValid() == false) {
+    return false;
+  } else if (IsBeforeBeginning()) {
+    return false;
+  } else if (iterator_ == map_->begin()) {
+    before_beginning_ = true;
+    return false;
+  } else {
+    iterator_--;
+    return current() != NULL;
+  }
+}
+
+bool
+XmppChatroomMemberEnumeratorImpl::Next() {
+  if (IsValid() == false) {
+    return false;
+  } else if (IsBeforeBeginning()) {
+    before_beginning_ = false;
+    iterator_ = map_->begin();
+    return current() != NULL;
+  } else if (IsAfterEnd()) {
+    return false;
+  } else {
+    iterator_++;
+    return current() != NULL;
+  }
+}
+
+bool
+XmppChatroomMemberEnumeratorImpl::IsValid() {
+  return map_version_created_ == *map_version_;
+}
+
+bool
+XmppChatroomMemberEnumeratorImpl::IsBeforeBeginning() {
+  return before_beginning_;
+}
+
+bool
+XmppChatroomMemberEnumeratorImpl::IsAfterEnd() {
+  return (iterator_ == map_->end());
+}
+
+
+
+} // namespace buzz