extensions/browser/api/cast_channel/cast_channel_api.cc

   1 // Copyright 2014 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 "extensions/browser/api/cast_channel/cast_channel_api.h"
   6
   7 #include <limits>
   8 #include <string>
   9
  10 #include "base/json/json_writer.h"
  11 #include "base/lazy_instance.h"
  12 #include "base/memory/scoped_ptr.h"
  13 #include "base/strings/string_number_conversions.h"
  14 #include "base/time/default_tick_clock.h"
  15 #include "base/values.h"
  16 #include "content/public/browser/browser_thread.h"
  17 #include "extensions/browser/api/cast_channel/cast_auth_ica.h"
  18 #include "extensions/browser/api/cast_channel/cast_message_util.h"
  19 #include "extensions/browser/api/cast_channel/cast_socket.h"
  20 #include "extensions/browser/api/cast_channel/keep_alive_delegate.h"
  21 #include "extensions/browser/api/cast_channel/logger.h"
  22 #include "extensions/browser/event_router.h"
  23 #include "extensions/common/api/cast_channel/cast_channel.pb.h"
  24 #include "extensions/common/api/cast_channel/logging.pb.h"
  25 #include "net/base/ip_endpoint.h"
  26 #include "net/base/net_errors.h"
  27 #include "net/base/net_util.h"
  28 #include "url/gurl.h"
  29
  30 // Default timeout interval for connection setup.
  31 // Used if not otherwise specified at ConnectInfo::timeout.
  32 const int kDefaultConnectTimeoutMillis = 5000;  // 5 seconds.
  33
  34 namespace extensions {
  35
  36 namespace Close = cast_channel::Close;
  37 namespace OnError = cast_channel::OnError;
  38 namespace OnMessage = cast_channel::OnMessage;
  39 namespace Open = cast_channel::Open;
  40 namespace Send = cast_channel::Send;
  41 using cast_channel::CastDeviceCapability;
  42 using cast_channel::CastMessage;
  43 using cast_channel::CastSocket;
  44 using cast_channel::ChannelAuthType;
  45 using cast_channel::ChannelError;
  46 using cast_channel::ChannelInfo;
  47 using cast_channel::ConnectInfo;
  48 using cast_channel::ErrorInfo;
  49 using cast_channel::LastErrors;
  50 using cast_channel::Logger;
  51 using cast_channel::MessageInfo;
  52 using cast_channel::ReadyState;
  53 using content::BrowserThread;
  54
  55 namespace {
  56
  57 // T is an extension dictionary (MessageInfo or ChannelInfo)
  58 template <class T>
  59 std::string ParamToString(const T& info) {
  60   scoped_ptr<base::DictionaryValue> dict = info.ToValue();
  61   std::string out;
  62   base::JSONWriter::Write(dict.get(), &out);
  63   return out;
  64 }
  65
  66 // Fills |channel_info| from the destination and state of |socket|.
  67 void FillChannelInfo(const CastSocket& socket, ChannelInfo* channel_info) {
  68   DCHECK(channel_info);
  69   channel_info->channel_id = socket.id();
  70   channel_info->url = socket.cast_url();
  71   const net::IPEndPoint& ip_endpoint = socket.ip_endpoint();
  72   channel_info->connect_info.ip_address = ip_endpoint.ToStringWithoutPort();
  73   channel_info->connect_info.port = ip_endpoint.port();
  74   channel_info->connect_info.auth = socket.channel_auth();
  75   channel_info->ready_state = socket.ready_state();
  76   channel_info->error_state = socket.error_state();
  77   channel_info->keep_alive = socket.keep_alive();
  78 }
  79
  80 // Fills |error_info| from |error_state| and |last_errors|.
  81 void FillErrorInfo(ChannelError error_state,
  82                    const LastErrors& last_errors,
  83                    ErrorInfo* error_info) {
  84   error_info->error_state = error_state;
  85   if (last_errors.event_type != cast_channel::proto::EVENT_TYPE_UNKNOWN)
  86     error_info->event_type.reset(new int(last_errors.event_type));
  87   if (last_errors.challenge_reply_error_type !=
  88       cast_channel::proto::CHALLENGE_REPLY_ERROR_NONE) {
  89     error_info->challenge_reply_error_type.reset(
  90         new int(last_errors.challenge_reply_error_type));
  91   }
  92   if (last_errors.net_return_value <= 0)
  93     error_info->net_return_value.reset(new int(last_errors.net_return_value));
  94   if (last_errors.nss_error_code < 0)
  95     error_info->nss_error_code.reset(new int(last_errors.nss_error_code));
  96 }
  97
  98 bool IsValidConnectInfoPort(const ConnectInfo& connect_info) {
  99   return connect_info.port > 0 && connect_info.port <
 100     std::numeric_limits<uint16_t>::max();
 101 }
 102
 103 bool IsValidConnectInfoAuth(const ConnectInfo& connect_info) {
 104   return connect_info.auth == cast_channel::CHANNEL_AUTH_TYPE_SSL_VERIFIED ||
 105     connect_info.auth == cast_channel::CHANNEL_AUTH_TYPE_SSL;
 106 }
 107
 108 bool IsValidConnectInfoIpAddress(const ConnectInfo& connect_info) {
 109   net::IPAddressNumber ip_address;
 110   return net::ParseIPLiteralToNumber(connect_info.ip_address, &ip_address);
 111 }
 112
 113 }  // namespace
 114
 115 CastChannelAPI::CastChannelAPI(content::BrowserContext* context)
 116     : browser_context_(context),
 117       logger_(
 118           new Logger(scoped_ptr<base::TickClock>(new base::DefaultTickClock),
 119                      base::TimeTicks::UnixEpoch())) {
 120   DCHECK(browser_context_);
 121 }
 122
 123 // static
 124 CastChannelAPI* CastChannelAPI::Get(content::BrowserContext* context) {
 125   return BrowserContextKeyedAPIFactory<CastChannelAPI>::Get(context);
 126 }
 127
 128 scoped_refptr<Logger> CastChannelAPI::GetLogger() {
 129   return logger_;
 130 }
 131
 132 static base::LazyInstance<BrowserContextKeyedAPIFactory<CastChannelAPI> >
 133     g_factory = LAZY_INSTANCE_INITIALIZER;
 134
 135 // static
 136 BrowserContextKeyedAPIFactory<CastChannelAPI>*
 137 CastChannelAPI::GetFactoryInstance() {
 138   return g_factory.Pointer();
 139 }
 140
 141 void CastChannelAPI::SetSocketForTest(scoped_ptr<CastSocket> socket_for_test) {
 142   socket_for_test_ = socket_for_test.Pass();
 143 }
 144
 145 scoped_ptr<CastSocket> CastChannelAPI::GetSocketForTest() {
 146   return socket_for_test_.Pass();
 147 }
 148
 149 content::BrowserContext* CastChannelAPI::GetBrowserContext() const {
 150   return browser_context_;
 151 }
 152
 153 void CastChannelAPI::SetPingTimeoutTimerForTest(scoped_ptr<base::Timer> timer) {
 154   injected_timeout_timer_ = timer.Pass();
 155 }
 156
 157 scoped_ptr<base::Timer> CastChannelAPI::GetInjectedTimeoutTimerForTest() {
 158   return injected_timeout_timer_.Pass();
 159 }
 160
 161 CastChannelAPI::~CastChannelAPI() {}
 162
 163 CastChannelAsyncApiFunction::CastChannelAsyncApiFunction() : manager_(NULL) {
 164 }
 165
 166 CastChannelAsyncApiFunction::~CastChannelAsyncApiFunction() { }
 167
 168 bool CastChannelAsyncApiFunction::PrePrepare() {
 169   manager_ = ApiResourceManager<CastSocket>::Get(browser_context());
 170   return true;
 171 }
 172
 173 bool CastChannelAsyncApiFunction::Respond() {
 174   return GetError().empty();
 175 }
 176
 177 CastSocket* CastChannelAsyncApiFunction::GetSocketOrCompleteWithError(
 178     int channel_id) {
 179   CastSocket* socket = GetSocket(channel_id);
 180   if (!socket) {
 181     SetResultFromError(channel_id,
 182                        cast_channel::CHANNEL_ERROR_INVALID_CHANNEL_ID);
 183     AsyncWorkCompleted();
 184   }
 185   return socket;
 186 }
 187
 188 int CastChannelAsyncApiFunction::AddSocket(CastSocket* socket) {
 189   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 190   DCHECK(socket);
 191   DCHECK(manager_);
 192   const int id = manager_->Add(socket);
 193   socket->set_id(id);
 194   return id;
 195 }
 196
 197 void CastChannelAsyncApiFunction::RemoveSocket(int channel_id) {
 198   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 199   DCHECK(manager_);
 200   manager_->Remove(extension_->id(), channel_id);
 201 }
 202
 203 void CastChannelAsyncApiFunction::SetResultFromSocket(
 204     const CastSocket& socket) {
 205   ChannelInfo channel_info;
 206   FillChannelInfo(socket, &channel_info);
 207   ChannelError error = socket.error_state();
 208   if (error != cast_channel::CHANNEL_ERROR_NONE) {
 209     SetError("Channel socket error = " + base::IntToString(error));
 210   }
 211   SetResultFromChannelInfo(channel_info);
 212 }
 213
 214 void CastChannelAsyncApiFunction::SetResultFromError(int channel_id,
 215                                                      ChannelError error) {
 216   ChannelInfo channel_info;
 217   channel_info.channel_id = channel_id;
 218   channel_info.url = "";
 219   channel_info.ready_state = cast_channel::READY_STATE_CLOSED;
 220   channel_info.error_state = error;
 221   channel_info.connect_info.ip_address = "";
 222   channel_info.connect_info.port = 0;
 223   channel_info.connect_info.auth = cast_channel::CHANNEL_AUTH_TYPE_SSL;
 224   SetResultFromChannelInfo(channel_info);
 225   SetError("Channel error = " + base::IntToString(error));
 226 }
 227
 228 CastSocket* CastChannelAsyncApiFunction::GetSocket(int channel_id) const {
 229   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 230   DCHECK(manager_);
 231   return manager_->Get(extension_->id(), channel_id);
 232 }
 233
 234 void CastChannelAsyncApiFunction::SetResultFromChannelInfo(
 235     const ChannelInfo& channel_info) {
 236   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 237   SetResult(channel_info.ToValue().release());
 238 }
 239
 240 CastChannelOpenFunction::CastChannelOpenFunction()
 241   : new_channel_id_(0) { }
 242
 243 CastChannelOpenFunction::~CastChannelOpenFunction() { }
 244
 245 // TODO(mfoltz): Remove URL parsing when clients have converted to use
 246 // ConnectInfo.
 247
 248 // Allowed schemes for Cast device URLs.
 249 const char kCastInsecureScheme[] = "cast";
 250 const char kCastSecureScheme[] = "casts";
 251
 252 bool CastChannelOpenFunction::ParseChannelUrl(const GURL& url,
 253                                               ConnectInfo* connect_info) {
 254   DCHECK(connect_info);
 255   VLOG(2) << "ParseChannelUrl";
 256   bool auth_required = false;
 257   if (url.SchemeIs(kCastSecureScheme)) {
 258     auth_required = true;
 259   } else if (!url.SchemeIs(kCastInsecureScheme)) {
 260     return false;
 261   }
 262   // TODO(mfoltz): Test for IPv6 addresses.  Brackets or no brackets?
 263   // TODO(mfoltz): Maybe enforce restriction to IPv4 private and IPv6
 264   // link-local networks
 265   const std::string& path = url.path();
 266   // Shortest possible: //A:B
 267   if (path.size() < 5) {
 268     return false;
 269   }
 270   if (path.find("//") != 0) {
 271     return false;
 272   }
 273   size_t colon = path.find_last_of(':');
 274   if (colon == std::string::npos || colon < 3 || colon > path.size() - 2) {
 275     return false;
 276   }
 277   const std::string& ip_address_str = path.substr(2, colon - 2);
 278   const std::string& port_str = path.substr(colon + 1);
 279   VLOG(2) << "IP: " << ip_address_str << " Port: " << port_str;
 280   int port;
 281   if (!base::StringToInt(port_str, &port))
 282     return false;
 283   connect_info->ip_address = ip_address_str;
 284   connect_info->port = port;
 285   connect_info->auth = auth_required ?
 286     cast_channel::CHANNEL_AUTH_TYPE_SSL_VERIFIED :
 287     cast_channel::CHANNEL_AUTH_TYPE_SSL;
 288   return true;
 289 }
 290
 291 net::IPEndPoint* CastChannelOpenFunction::ParseConnectInfo(
 292     const ConnectInfo& connect_info) {
 293   net::IPAddressNumber ip_address;
 294   CHECK(net::ParseIPLiteralToNumber(connect_info.ip_address, &ip_address));
 295   return new net::IPEndPoint(ip_address,
 296                              static_cast<uint16>(connect_info.port));
 297 }
 298
 299 bool CastChannelOpenFunction::PrePrepare() {
 300   api_ = CastChannelAPI::Get(browser_context());
 301   return CastChannelAsyncApiFunction::PrePrepare();
 302 }
 303
 304 bool CastChannelOpenFunction::Prepare() {
 305   params_ = Open::Params::Create(*args_);
 306   EXTENSION_FUNCTION_VALIDATE(params_.get());
 307   // The connect_info parameter may be a string URL like cast:// or casts:// or
 308   // a ConnectInfo object.
 309   std::string cast_url;
 310   switch (params_->connect_info->GetType()) {
 311     case base::Value::TYPE_STRING:
 312       CHECK(params_->connect_info->GetAsString(&cast_url));
 313       connect_info_.reset(new ConnectInfo);
 314       if (!ParseChannelUrl(GURL(cast_url), connect_info_.get())) {
 315         connect_info_.reset();
 316         SetError("Invalid connect_info (invalid Cast URL " + cast_url + ")");
 317       }
 318       break;
 319     case base::Value::TYPE_DICTIONARY:
 320       connect_info_ = ConnectInfo::FromValue(*(params_->connect_info));
 321       if (!connect_info_.get()) {
 322         SetError("connect_info.auth is required");
 323       }
 324       break;
 325     default:
 326       SetError("Invalid connect_info (unknown type)");
 327       break;
 328   }
 329   if (!connect_info_.get()) {
 330     return false;
 331   }
 332   if (!IsValidConnectInfoPort(*connect_info_)) {
 333     SetError("Invalid connect_info (invalid port)");
 334   } else if (!IsValidConnectInfoAuth(*connect_info_)) {
 335     SetError("Invalid connect_info (invalid auth)");
 336   } else if (!IsValidConnectInfoIpAddress(*connect_info_)) {
 337     SetError("Invalid connect_info (invalid IP address)");
 338   } else {
 339     // Parse timeout parameters if they are set.
 340     if (connect_info_->liveness_timeout) {
 341       liveness_timeout_ =
 342           base::TimeDelta::FromMilliseconds(*connect_info_->liveness_timeout);
 343     }
 344     if (connect_info_->ping_interval) {
 345       ping_interval_ =
 346           base::TimeDelta::FromMilliseconds(*connect_info_->ping_interval);
 347     }
 348
 349     // Validate timeout parameters.
 350     if (liveness_timeout_ < base::TimeDelta() ||
 351         ping_interval_ < base::TimeDelta()) {
 352       SetError("livenessTimeout and pingInterval must be greater than 0.");
 353     } else if ((liveness_timeout_ > base::TimeDelta()) !=
 354                (ping_interval_ > base::TimeDelta())) {
 355       SetError("livenessTimeout and pingInterval must be set together.");
 356     } else if (liveness_timeout_ < ping_interval_) {
 357       SetError("livenessTimeout must be longer than pingTimeout.");
 358     }
 359   }
 360
 361   if (!GetError().empty()) {
 362     return false;
 363   }
 364
 365   channel_auth_ = connect_info_->auth;
 366   ip_endpoint_.reset(ParseConnectInfo(*connect_info_));
 367   return true;
 368 }
 369
 370 void CastChannelOpenFunction::AsyncWorkStart() {
 371   DCHECK(api_);
 372   DCHECK(ip_endpoint_.get());
 373   CastSocket* socket;
 374   scoped_ptr<CastSocket> test_socket = api_->GetSocketForTest();
 375   if (test_socket.get()) {
 376     socket = test_socket.release();
 377   } else {
 378     socket = new cast_channel::CastSocketImpl(
 379         extension_->id(), *ip_endpoint_, channel_auth_,
 380         ExtensionsBrowserClient::Get()->GetNetLog(),
 381         base::TimeDelta::FromMilliseconds(connect_info_->timeout.get()
 382                                               ? *connect_info_->timeout
 383                                               : kDefaultConnectTimeoutMillis),
 384         liveness_timeout_ > base::TimeDelta(), api_->GetLogger(),
 385         connect_info_->capabilities ? *connect_info_->capabilities
 386                                     : CastDeviceCapability::NONE);
 387   }
 388   new_channel_id_ = AddSocket(socket);
 389   api_->GetLogger()->LogNewSocketEvent(*socket);
 390
 391   // Construct read delegates.
 392   scoped_ptr<core_api::cast_channel::CastTransport::Delegate> delegate(
 393       make_scoped_ptr(new CastMessageHandler(api_, socket)));
 394   if (socket->keep_alive()) {
 395     // Wrap read delegate in a KeepAliveDelegate for timeout handling.
 396     core_api::cast_channel::KeepAliveDelegate* keep_alive =
 397         new core_api::cast_channel::KeepAliveDelegate(
 398             socket, delegate.Pass(), ping_interval_, liveness_timeout_);
 399     scoped_ptr<base::Timer> injected_timer =
 400         api_->GetInjectedTimeoutTimerForTest();
 401     if (injected_timer) {
 402       keep_alive->SetTimersForTest(
 403           make_scoped_ptr(new base::Timer(false, false)),
 404           injected_timer.Pass());
 405     }
 406     delegate.reset(keep_alive);
 407   }
 408
 409   api_->GetLogger()->LogNewSocketEvent(*socket);
 410   socket->Connect(delegate.Pass(),
 411                   base::Bind(&CastChannelOpenFunction::OnOpen, this));
 412 }
 413
 414 void CastChannelOpenFunction::OnOpen(cast_channel::ChannelError result) {
 415   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 416   VLOG(1) << "Connect finished, OnOpen invoked.";
 417   CastSocket* socket = GetSocket(new_channel_id_);
 418   if (!socket) {
 419     SetResultFromError(new_channel_id_, result);
 420   } else {
 421     SetResultFromSocket(*socket);
 422   }
 423   AsyncWorkCompleted();
 424 }
 425
 426 CastChannelSendFunction::CastChannelSendFunction() { }
 427
 428 CastChannelSendFunction::~CastChannelSendFunction() { }
 429
 430 bool CastChannelSendFunction::Prepare() {
 431   params_ = Send::Params::Create(*args_);
 432   EXTENSION_FUNCTION_VALIDATE(params_.get());
 433   if (params_->message.namespace_.empty()) {
 434     SetError("message_info.namespace_ is required");
 435     return false;
 436   }
 437   if (params_->message.source_id.empty()) {
 438     SetError("message_info.source_id is required");
 439     return false;
 440   }
 441   if (params_->message.destination_id.empty()) {
 442     SetError("message_info.destination_id is required");
 443     return false;
 444   }
 445   switch (params_->message.data->GetType()) {
 446     case base::Value::TYPE_STRING:
 447     case base::Value::TYPE_BINARY:
 448       break;
 449     default:
 450       SetError("Invalid type of message_info.data");
 451       return false;
 452   }
 453   return true;
 454 }
 455
 456 void CastChannelSendFunction::AsyncWorkStart() {
 457   CastSocket* socket = GetSocket(params_->channel.channel_id);
 458   if (!socket) {
 459     SetResultFromError(params_->channel.channel_id,
 460                        cast_channel::CHANNEL_ERROR_INVALID_CHANNEL_ID);
 461     AsyncWorkCompleted();
 462     return;
 463   }
 464   CastMessage message_to_send;
 465   if (!MessageInfoToCastMessage(params_->message, &message_to_send)) {
 466     SetResultFromError(params_->channel.channel_id,
 467                        cast_channel::CHANNEL_ERROR_INVALID_MESSAGE);
 468     AsyncWorkCompleted();
 469     return;
 470   }
 471   socket->transport()->SendMessage(
 472       message_to_send, base::Bind(&CastChannelSendFunction::OnSend, this));
 473 }
 474
 475 void CastChannelSendFunction::OnSend(int result) {
 476   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 477   int channel_id = params_->channel.channel_id;
 478   CastSocket* socket = GetSocket(channel_id);
 479   if (result < 0 || !socket) {
 480     SetResultFromError(channel_id,
 481                        cast_channel::CHANNEL_ERROR_SOCKET_ERROR);
 482   } else {
 483     SetResultFromSocket(*socket);
 484   }
 485   AsyncWorkCompleted();
 486 }
 487
 488 CastChannelCloseFunction::CastChannelCloseFunction() { }
 489
 490 CastChannelCloseFunction::~CastChannelCloseFunction() { }
 491
 492 bool CastChannelCloseFunction::Prepare() {
 493   params_ = Close::Params::Create(*args_);
 494   EXTENSION_FUNCTION_VALIDATE(params_.get());
 495   return true;
 496 }
 497
 498 void CastChannelCloseFunction::AsyncWorkStart() {
 499   CastSocket* socket = GetSocket(params_->channel.channel_id);
 500   if (!socket) {
 501     SetResultFromError(params_->channel.channel_id,
 502                        cast_channel::CHANNEL_ERROR_INVALID_CHANNEL_ID);
 503     AsyncWorkCompleted();
 504   } else {
 505     socket->Close(base::Bind(&CastChannelCloseFunction::OnClose, this));
 506   }
 507 }
 508
 509 void CastChannelCloseFunction::OnClose(int result) {
 510   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 511   VLOG(1) << "CastChannelCloseFunction::OnClose result = " << result;
 512   int channel_id = params_->channel.channel_id;
 513   CastSocket* socket = GetSocket(channel_id);
 514   if (result < 0 || !socket) {
 515     SetResultFromError(channel_id,
 516                        cast_channel::CHANNEL_ERROR_SOCKET_ERROR);
 517   } else {
 518     SetResultFromSocket(*socket);
 519     // This will delete |socket|.
 520     RemoveSocket(channel_id);
 521   }
 522   AsyncWorkCompleted();
 523 }
 524
 525 CastChannelGetLogsFunction::CastChannelGetLogsFunction() {
 526 }
 527
 528 CastChannelGetLogsFunction::~CastChannelGetLogsFunction() {
 529 }
 530
 531 bool CastChannelGetLogsFunction::PrePrepare() {
 532   api_ = CastChannelAPI::Get(browser_context());
 533   return CastChannelAsyncApiFunction::PrePrepare();
 534 }
 535
 536 bool CastChannelGetLogsFunction::Prepare() {
 537   return true;
 538 }
 539
 540 void CastChannelGetLogsFunction::AsyncWorkStart() {
 541   DCHECK(api_);
 542
 543   size_t length = 0;
 544   scoped_ptr<char[]> out = api_->GetLogger()->GetLogs(&length);
 545   if (out.get()) {
 546     SetResult(new base::BinaryValue(out.Pass(), length));
 547   } else {
 548     SetError("Unable to get logs.");
 549   }
 550
 551   api_->GetLogger()->Reset();
 552
 553   AsyncWorkCompleted();
 554 }
 555
 556 CastChannelOpenFunction::CastMessageHandler::CastMessageHandler(
 557     CastChannelAPI* api,
 558     cast_channel::CastSocket* socket)
 559     : api(api), socket(socket) {
 560   DCHECK(api);
 561   DCHECK(socket);
 562 }
 563
 564 CastChannelOpenFunction::CastMessageHandler::~CastMessageHandler() {
 565 }
 566
 567 void CastChannelOpenFunction::CastMessageHandler::OnError(
 568     cast_channel::ChannelError error_state,
 569     const cast_channel::LastErrors& last_errors) {
 570   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 571
 572   ChannelInfo channel_info;
 573   FillChannelInfo(*socket, &channel_info);
 574   channel_info.error_state = error_state;
 575   ErrorInfo error_info;
 576   FillErrorInfo(error_state, last_errors, &error_info);
 577
 578   scoped_ptr<base::ListValue> results =
 579       OnError::Create(channel_info, error_info);
 580   scoped_ptr<Event> event(new Event(OnError::kEventName, results.Pass()));
 581   extensions::EventRouter::Get(api->GetBrowserContext())
 582       ->DispatchEventToExtension(socket->owner_extension_id(), event.Pass());
 583 }
 584
 585 void CastChannelOpenFunction::CastMessageHandler::OnMessage(
 586     const CastMessage& message) {
 587   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 588
 589   MessageInfo message_info;
 590   cast_channel::CastMessageToMessageInfo(message, &message_info);
 591   ChannelInfo channel_info;
 592   FillChannelInfo(*socket, &channel_info);
 593   VLOG(1) << "Received message " << ParamToString(message_info)
 594           << " on channel " << ParamToString(channel_info);
 595
 596   scoped_ptr<base::ListValue> results =
 597       OnMessage::Create(channel_info, message_info);
 598   scoped_ptr<Event> event(new Event(OnMessage::kEventName, results.Pass()));
 599   extensions::EventRouter::Get(api->GetBrowserContext())
 600       ->DispatchEventToExtension(socket->owner_extension_id(), event.Pass());
 601 }
 602
 603 void CastChannelOpenFunction::CastMessageHandler::Start() {
 604 }
 605
 606 CastChannelSetAuthorityKeysFunction::CastChannelSetAuthorityKeysFunction() {
 607 }
 608
 609 CastChannelSetAuthorityKeysFunction::~CastChannelSetAuthorityKeysFunction() {
 610 }
 611
 612 bool CastChannelSetAuthorityKeysFunction::Prepare() {
 613   params_ = cast_channel::SetAuthorityKeys::Params::Create(*args_);
 614   EXTENSION_FUNCTION_VALIDATE(params_.get());
 615   return true;
 616 }
 617
 618 void CastChannelSetAuthorityKeysFunction::AsyncWorkStart() {
 619   std::string& keys = params_->keys;
 620   std::string& signature = params_->signature;
 621   if (signature.empty() || keys.empty() ||
 622       !cast_channel::SetTrustedCertificateAuthorities(keys, signature)) {
 623     SetError("Unable to set authority keys.");
 624   }
 625
 626   AsyncWorkCompleted();
 627 }
 628
 629 }  // namespace extensions