jingle/notifier/communicator/single_login_attempt.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include <string>
   6
   7 #include "jingle/notifier/communicator/single_login_attempt.h"
   8
   9 #include "base/basictypes.h"
  10 #include "base/logging.h"
  11 #include "base/strings/string_number_conversions.h"
  12 #include "base/strings/string_split.h"
  13 #include "jingle/notifier/base/const_communicator.h"
  14 #include "jingle/notifier/base/gaia_token_pre_xmpp_auth.h"
  15 #include "jingle/notifier/listener/xml_element_util.h"
  16 #include "net/base/host_port_pair.h"
  17 #include "third_party/webrtc/libjingle/xmllite/xmlelement.h"
  18 #include "webrtc/libjingle/xmpp/constants.h"
  19 #include "webrtc/libjingle/xmpp/xmppclientsettings.h"
  20
  21 namespace notifier {
  22
  23 SingleLoginAttempt::Delegate::~Delegate() {}
  24
  25 SingleLoginAttempt::SingleLoginAttempt(const LoginSettings& login_settings,
  26                                        Delegate* delegate)
  27     : login_settings_(login_settings),
  28       delegate_(delegate),
  29       settings_list_(
  30           MakeConnectionSettingsList(login_settings_.GetServers(),
  31                                      login_settings_.try_ssltcp_first())),
  32       current_settings_(settings_list_.begin()) {
  33   if (settings_list_.empty()) {
  34     NOTREACHED();
  35     return;
  36   }
  37   TryConnect(*current_settings_);
  38 }
  39
  40 SingleLoginAttempt::~SingleLoginAttempt() {}
  41
  42 // In the code below, we assume that calling a delegate method may end
  43 // up in ourselves being deleted, so we always call it last.
  44 //
  45 // TODO(akalin): Add unit tests to enforce the behavior above.
  46
  47 void SingleLoginAttempt::OnConnect(
  48     base::WeakPtr<buzz::XmppTaskParentInterface> base_task) {
  49   DVLOG(1) << "Connected to " << current_settings_->ToString();
  50   delegate_->OnConnect(base_task);
  51 }
  52
  53 namespace {
  54
  55 // This function is more permissive than
  56 // net::HostPortPair::FromString().  If the port is missing or
  57 // unparseable, it assumes the default XMPP port.  The hostname may be
  58 // empty.
  59 net::HostPortPair ParseRedirectText(const std::string& redirect_text) {
  60   std::vector<std::string> parts;
  61   base::SplitString(redirect_text, ':', &parts);
  62   net::HostPortPair redirect_server;
  63   redirect_server.set_port(kDefaultXmppPort);
  64   if (parts.empty()) {
  65     return redirect_server;
  66   }
  67   redirect_server.set_host(parts[0]);
  68   if (parts.size() <= 1) {
  69     return redirect_server;
  70   }
  71   // Try to parse the port, falling back to kDefaultXmppPort.
  72   int port = kDefaultXmppPort;
  73   if (!base::StringToInt(parts[1], &port)) {
  74     port = kDefaultXmppPort;
  75   }
  76   if (port <= 0 || port > kuint16max) {
  77     port = kDefaultXmppPort;
  78   }
  79   redirect_server.set_port(port);
  80   return redirect_server;
  81 }
  82
  83 }  // namespace
  84
  85 void SingleLoginAttempt::OnError(buzz::XmppEngine::Error error, int subcode,
  86                                  const buzz::XmlElement* stream_error) {
  87   DVLOG(1) << "Error: " << error << ", subcode: " << subcode
  88            << (stream_error
  89                    ? (", stream error: " + XmlElementToString(*stream_error))
  90                    : std::string());
  91
  92   DCHECK_EQ(error == buzz::XmppEngine::ERROR_STREAM, stream_error != NULL);
  93
  94   // Check for redirection.  We expect something like:
  95   //
  96   // <stream:error><see-other-host xmlns="urn:ietf:params:xml:ns:xmpp-streams"/><str:text xmlns:str="urn:ietf:params:xml:ns:xmpp-streams">talk.google.com</str:text></stream:error> [2]
  97   //
  98   // There are some differences from the spec [1]:
  99   //
 100   //   - we expect a separate text element with the redirection info
 101   //     (which is the format Google Talk's servers use), whereas the
 102   //     spec puts the redirection info directly in the see-other-host
 103   //     element;
 104   //   - we check for redirection only during login, whereas the
 105   //     server can send down a redirection at any time according to
 106   //     the spec. (TODO(akalin): Figure out whether we need to handle
 107   //     redirection at any other point.)
 108   //
 109   // [1]: http://xmpp.org/internet-drafts/draft-saintandre-rfc3920bis-08.html#streams-error-conditions-see-other-host
 110   // [2]: http://forums.miranda-im.org/showthread.php?24376-GoogleTalk-drops
 111   if (stream_error) {
 112     const buzz::XmlElement* other =
 113         stream_error->FirstNamed(buzz::QN_XSTREAM_SEE_OTHER_HOST);
 114     if (other) {
 115       const buzz::XmlElement* text =
 116           stream_error->FirstNamed(buzz::QN_XSTREAM_TEXT);
 117       if (text) {
 118         // Yep, its a "stream:error" with "see-other-host" text,
 119         // let's parse out the server:port, and then reconnect
 120         // with that.
 121         const net::HostPortPair& redirect_server =
 122             ParseRedirectText(text->BodyText());
 123         // ParseRedirectText shouldn't return a zero port.
 124         DCHECK_NE(redirect_server.port(), 0u);
 125         // If we don't have a host, ignore the redirection and treat
 126         // it like a regular error.
 127         if (!redirect_server.host().empty()) {
 128           delegate_->OnRedirect(
 129               ServerInformation(
 130                   redirect_server,
 131                   current_settings_->ssltcp_support));
 132           // May be deleted at this point.
 133           return;
 134         }
 135       }
 136     }
 137   }
 138
 139   if (error == buzz::XmppEngine::ERROR_UNAUTHORIZED) {
 140     DVLOG(1) << "Credentials rejected";
 141     delegate_->OnCredentialsRejected();
 142     return;
 143   }
 144
 145   if (current_settings_ == settings_list_.end()) {
 146     NOTREACHED();
 147     return;
 148   }
 149
 150   ++current_settings_;
 151   if (current_settings_ == settings_list_.end()) {
 152     DVLOG(1) << "Could not connect to any XMPP server";
 153     delegate_->OnSettingsExhausted();
 154     return;
 155   }
 156
 157   TryConnect(*current_settings_);
 158 }
 159
 160 void SingleLoginAttempt::TryConnect(
 161     const ConnectionSettings& connection_settings) {
 162   DVLOG(1) << "Trying to connect to " << connection_settings.ToString();
 163   // Copy the user settings and fill in the connection parameters from
 164   // |connection_settings|.
 165   buzz::XmppClientSettings client_settings = login_settings_.user_settings();
 166   connection_settings.FillXmppClientSettings(&client_settings);
 167
 168   buzz::Jid jid(client_settings.user(), client_settings.host(),
 169                 buzz::STR_EMPTY);
 170   buzz::PreXmppAuth* pre_xmpp_auth =
 171       new GaiaTokenPreXmppAuth(
 172           jid.Str(), client_settings.auth_token(),
 173           client_settings.token_service(),
 174           login_settings_.auth_mechanism());
 175   xmpp_connection_.reset(
 176       new XmppConnection(client_settings,
 177                          login_settings_.request_context_getter(),
 178                          this,
 179                          pre_xmpp_auth));
 180 }
 181
 182 }  // namespace notifier