ppapi/proxy/websocket_resource.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 "ppapi/proxy/websocket_resource.h"
   6
   7 #include <set>
   8 #include <string>
   9 #include <vector>
  10
  11 #include "base/bind.h"
  12 #include "ppapi/c/pp_errors.h"
  13 #include "ppapi/proxy/dispatch_reply_message.h"
  14 #include "ppapi/proxy/ppapi_messages.h"
  15 #include "ppapi/shared_impl/ppapi_globals.h"
  16 #include "ppapi/shared_impl/var.h"
  17 #include "ppapi/shared_impl/var_tracker.h"
  18 #include "third_party/WebKit/public/web/WebSocket.h"
  19
  20 namespace {
  21
  22 const uint32_t kMaxReasonSizeInBytes = 123;
  23 const size_t kBaseFramingOverhead = 2;
  24 const size_t kMaskingKeyLength = 4;
  25 const size_t kMinimumPayloadSizeWithTwoByteExtendedPayloadLength = 126;
  26 const size_t kMinimumPayloadSizeWithEightByteExtendedPayloadLength = 0x10000;
  27
  28 uint64_t SaturateAdd(uint64_t a, uint64_t b) {
  29   if (kuint64max - a < b)
  30     return kuint64max;
  31   return a + b;
  32 }
  33
  34 uint64_t GetFrameSize(uint64_t payload_size) {
  35   uint64_t overhead = kBaseFramingOverhead + kMaskingKeyLength;
  36   if (payload_size > kMinimumPayloadSizeWithEightByteExtendedPayloadLength)
  37     overhead += 8;
  38   else if (payload_size > kMinimumPayloadSizeWithTwoByteExtendedPayloadLength)
  39     overhead += 2;
  40   return SaturateAdd(payload_size, overhead);
  41 }
  42
  43 bool InValidStateToReceive(PP_WebSocketReadyState state) {
  44   return state == PP_WEBSOCKETREADYSTATE_OPEN ||
  45          state == PP_WEBSOCKETREADYSTATE_CLOSING;
  46 }
  47
  48 }  // namespace
  49
  50
  51 namespace ppapi {
  52 namespace proxy {
  53
  54 WebSocketResource::WebSocketResource(Connection connection,
  55                                      PP_Instance instance)
  56     : PluginResource(connection, instance),
  57       state_(PP_WEBSOCKETREADYSTATE_INVALID),
  58       error_was_received_(false),
  59       receive_callback_var_(NULL),
  60       empty_string_(new StringVar(std::string())),
  61       close_code_(0),
  62       close_reason_(NULL),
  63       close_was_clean_(PP_FALSE),
  64       extensions_(NULL),
  65       protocol_(NULL),
  66       url_(NULL),
  67       buffered_amount_(0),
  68       buffered_amount_after_close_(0) {
  69 }
  70
  71 WebSocketResource::~WebSocketResource() {
  72 }
  73
  74 thunk::PPB_WebSocket_API* WebSocketResource::AsPPB_WebSocket_API() {
  75   return this;
  76 }
  77
  78 int32_t WebSocketResource::Connect(
  79     const PP_Var& url,
  80     const PP_Var protocols[],
  81     uint32_t protocol_count,
  82     scoped_refptr<TrackedCallback> callback) {
  83   if (TrackedCallback::IsPending(connect_callback_))
  84     return PP_ERROR_INPROGRESS;
  85
  86   // Connect() can be called at most once.
  87   if (state_ != PP_WEBSOCKETREADYSTATE_INVALID)
  88     return PP_ERROR_INPROGRESS;
  89   state_ = PP_WEBSOCKETREADYSTATE_CLOSED;
  90
  91   // Get the URL.
  92   url_ = StringVar::FromPPVar(url);
  93   if (!url_.get())
  94     return PP_ERROR_BADARGUMENT;
  95
  96   // Get the protocols.
  97   std::set<std::string> protocol_set;
  98   std::vector<std::string> protocol_strings;
  99   protocol_strings.reserve(protocol_count);
 100   for (uint32_t i = 0; i < protocol_count; ++i) {
 101     scoped_refptr<StringVar> protocol(StringVar::FromPPVar(protocols[i]));
 102
 103     // Check invalid and empty entries.
 104     if (!protocol.get() || !protocol->value().length())
 105       return PP_ERROR_BADARGUMENT;
 106
 107     // Check duplicated protocol entries.
 108     if (protocol_set.find(protocol->value()) != protocol_set.end())
 109       return PP_ERROR_BADARGUMENT;
 110     protocol_set.insert(protocol->value());
 111
 112     protocol_strings.push_back(protocol->value());
 113   }
 114
 115   // Install callback.
 116   connect_callback_ = callback;
 117
 118   // Create remote host in the renderer, then request to check the URL and
 119   // establish the connection.
 120   state_ = PP_WEBSOCKETREADYSTATE_CONNECTING;
 121   SendCreate(RENDERER, PpapiHostMsg_WebSocket_Create());
 122   PpapiHostMsg_WebSocket_Connect msg(url_->value(), protocol_strings);
 123   Call<PpapiPluginMsg_WebSocket_ConnectReply>(RENDERER, msg,
 124       base::Bind(&WebSocketResource::OnPluginMsgConnectReply, this));
 125
 126   return PP_OK_COMPLETIONPENDING;
 127 }
 128
 129 int32_t WebSocketResource::Close(uint16_t code,
 130                                  const PP_Var& reason,
 131                                  scoped_refptr<TrackedCallback> callback) {
 132   if (TrackedCallback::IsPending(close_callback_))
 133     return PP_ERROR_INPROGRESS;
 134   if (state_ == PP_WEBSOCKETREADYSTATE_INVALID)
 135     return PP_ERROR_FAILED;
 136
 137   // Validate |code| and |reason|.
 138   scoped_refptr<StringVar> reason_string_var;
 139   std::string reason_string;
 140   blink::WebSocket::CloseEventCode event_code =
 141       static_cast<blink::WebSocket::CloseEventCode>(code);
 142   if (code == PP_WEBSOCKETSTATUSCODE_NOT_SPECIFIED) {
 143     // PP_WEBSOCKETSTATUSCODE_NOT_SPECIFIED and CloseEventCodeNotSpecified are
 144     // assigned to different values. A conversion is needed if
 145     // PP_WEBSOCKETSTATUSCODE_NOT_SPECIFIED is specified.
 146     event_code = blink::WebSocket::CloseEventCodeNotSpecified;
 147   } else {
 148     if (!(code == PP_WEBSOCKETSTATUSCODE_NORMAL_CLOSURE ||
 149         (PP_WEBSOCKETSTATUSCODE_USER_REGISTERED_MIN <= code &&
 150         code <= PP_WEBSOCKETSTATUSCODE_USER_PRIVATE_MAX)))
 151       // RFC 6455 limits applications to use reserved connection close code in
 152       // section 7.4.2.. The WebSocket API (http://www.w3.org/TR/websockets/)
 153       // defines this out of range error as InvalidAccessError in JavaScript.
 154       return PP_ERROR_NOACCESS;
 155
 156     // |reason| must be ignored if it is PP_VARTYPE_UNDEFINED or |code| is
 157     // PP_WEBSOCKETSTATUSCODE_NOT_SPECIFIED.
 158     if (reason.type != PP_VARTYPE_UNDEFINED) {
 159       // Validate |reason|.
 160       reason_string_var = StringVar::FromPPVar(reason);
 161       if (!reason_string_var.get() ||
 162           reason_string_var->value().size() > kMaxReasonSizeInBytes)
 163         return PP_ERROR_BADARGUMENT;
 164       reason_string = reason_string_var->value();
 165     }
 166   }
 167
 168   // Check state.
 169   if (state_ == PP_WEBSOCKETREADYSTATE_CLOSING)
 170     return PP_ERROR_INPROGRESS;
 171   if (state_ == PP_WEBSOCKETREADYSTATE_CLOSED)
 172     return PP_OK;
 173
 174   // Install |callback|.
 175   close_callback_ = callback;
 176
 177   // Abort ongoing connect.
 178   if (TrackedCallback::IsPending(connect_callback_)) {
 179     state_ = PP_WEBSOCKETREADYSTATE_CLOSING;
 180     // Need to do a "Post" to avoid reentering the plugin.
 181     connect_callback_->PostAbort();
 182     connect_callback_ = NULL;
 183     Post(RENDERER, PpapiHostMsg_WebSocket_Fail(
 184         "WebSocket was closed before the connection was established."));
 185     return PP_OK_COMPLETIONPENDING;
 186   }
 187
 188   // Abort ongoing receive.
 189   if (TrackedCallback::IsPending(receive_callback_)) {
 190     receive_callback_var_ = NULL;
 191     // Need to do a "Post" to avoid reentering the plugin.
 192     receive_callback_->PostAbort();
 193     receive_callback_ = NULL;
 194   }
 195
 196   // Close connection.
 197   state_ = PP_WEBSOCKETREADYSTATE_CLOSING;
 198   PpapiHostMsg_WebSocket_Close msg(static_cast<int32_t>(event_code),
 199                                    reason_string);
 200   Call<PpapiPluginMsg_WebSocket_CloseReply>(RENDERER, msg,
 201       base::Bind(&WebSocketResource::OnPluginMsgCloseReply, this));
 202   return PP_OK_COMPLETIONPENDING;
 203 }
 204
 205 int32_t WebSocketResource::ReceiveMessage(
 206     PP_Var* message,
 207     scoped_refptr<TrackedCallback> callback) {
 208   if (TrackedCallback::IsPending(receive_callback_))
 209     return PP_ERROR_INPROGRESS;
 210
 211   // Check state.
 212   if (state_ == PP_WEBSOCKETREADYSTATE_INVALID ||
 213       state_ == PP_WEBSOCKETREADYSTATE_CONNECTING)
 214     return PP_ERROR_BADARGUMENT;
 215
 216   // Just return received message if any received message is queued.
 217   if (!received_messages_.empty()) {
 218     receive_callback_var_ = message;
 219     return DoReceive();
 220   }
 221
 222   // Check state again. In CLOSED state, no more messages will be received.
 223   if (state_ == PP_WEBSOCKETREADYSTATE_CLOSED)
 224     return PP_ERROR_BADARGUMENT;
 225
 226   // Returns PP_ERROR_FAILED after an error is received and received messages
 227   // is exhausted.
 228   if (error_was_received_)
 229     return PP_ERROR_FAILED;
 230
 231   // Or retain |message| as buffer to store and install |callback|.
 232   receive_callback_var_ = message;
 233   receive_callback_ = callback;
 234
 235   return PP_OK_COMPLETIONPENDING;
 236 }
 237
 238 int32_t WebSocketResource::SendMessage(const PP_Var& message) {
 239   // Check state.
 240   if (state_ == PP_WEBSOCKETREADYSTATE_INVALID ||
 241       state_ == PP_WEBSOCKETREADYSTATE_CONNECTING)
 242     return PP_ERROR_BADARGUMENT;
 243
 244   if (state_ == PP_WEBSOCKETREADYSTATE_CLOSING ||
 245       state_ == PP_WEBSOCKETREADYSTATE_CLOSED) {
 246     // Handle buffered_amount_after_close_.
 247     uint64_t payload_size = 0;
 248     if (message.type == PP_VARTYPE_STRING) {
 249       scoped_refptr<StringVar> message_string = StringVar::FromPPVar(message);
 250       if (message_string.get())
 251         payload_size += message_string->value().length();
 252     } else if (message.type == PP_VARTYPE_ARRAY_BUFFER) {
 253       scoped_refptr<ArrayBufferVar> message_array_buffer =
 254           ArrayBufferVar::FromPPVar(message);
 255       if (message_array_buffer.get())
 256         payload_size += message_array_buffer->ByteLength();
 257     } else {
 258       // TODO(toyoshim): Support Blob.
 259       return PP_ERROR_NOTSUPPORTED;
 260     }
 261
 262     buffered_amount_after_close_ =
 263         SaturateAdd(buffered_amount_after_close_, GetFrameSize(payload_size));
 264
 265     return PP_ERROR_FAILED;
 266   }
 267
 268   // Send the message.
 269   if (message.type == PP_VARTYPE_STRING) {
 270     // Convert message to std::string, then send it.
 271     scoped_refptr<StringVar> message_string = StringVar::FromPPVar(message);
 272     if (!message_string.get())
 273       return PP_ERROR_BADARGUMENT;
 274     Post(RENDERER, PpapiHostMsg_WebSocket_SendText(message_string->value()));
 275   } else if (message.type == PP_VARTYPE_ARRAY_BUFFER) {
 276     // Convert message to std::vector<uint8_t>, then send it.
 277     scoped_refptr<ArrayBufferVar> message_arraybuffer =
 278         ArrayBufferVar::FromPPVar(message);
 279     if (!message_arraybuffer.get())
 280       return PP_ERROR_BADARGUMENT;
 281     uint8_t* message_data = static_cast<uint8_t*>(message_arraybuffer->Map());
 282     uint32 message_length = message_arraybuffer->ByteLength();
 283     std::vector<uint8_t> message_vector(message_data,
 284                                         message_data + message_length);
 285     Post(RENDERER, PpapiHostMsg_WebSocket_SendBinary(message_vector));
 286   } else {
 287     // TODO(toyoshim): Support Blob.
 288     return PP_ERROR_NOTSUPPORTED;
 289   }
 290   return PP_OK;
 291 }
 292
 293 uint64_t WebSocketResource::GetBufferedAmount() {
 294   return SaturateAdd(buffered_amount_, buffered_amount_after_close_);
 295 }
 296
 297 uint16_t WebSocketResource::GetCloseCode() {
 298   return close_code_;
 299 }
 300
 301 PP_Var WebSocketResource::GetCloseReason() {
 302   if (!close_reason_.get())
 303     return empty_string_->GetPPVar();
 304   return close_reason_->GetPPVar();
 305 }
 306
 307 PP_Bool WebSocketResource::GetCloseWasClean() {
 308   return close_was_clean_;
 309 }
 310
 311 PP_Var WebSocketResource::GetExtensions() {
 312   return StringVar::StringToPPVar(std::string());
 313 }
 314
 315 PP_Var WebSocketResource::GetProtocol() {
 316   if (!protocol_.get())
 317     return empty_string_->GetPPVar();
 318   return protocol_->GetPPVar();
 319 }
 320
 321 PP_WebSocketReadyState WebSocketResource::GetReadyState() {
 322   return state_;
 323 }
 324
 325 PP_Var WebSocketResource::GetURL() {
 326   if (!url_.get())
 327     return empty_string_->GetPPVar();
 328   return url_->GetPPVar();
 329 }
 330
 331 void WebSocketResource::OnReplyReceived(
 332     const ResourceMessageReplyParams& params,
 333     const IPC::Message& msg) {
 334   if (params.sequence()) {
 335     PluginResource::OnReplyReceived(params, msg);
 336     return;
 337   }
 338
 339   IPC_BEGIN_MESSAGE_MAP(WebSocketResource, msg)
 340     PPAPI_DISPATCH_PLUGIN_RESOURCE_CALL(
 341         PpapiPluginMsg_WebSocket_ReceiveTextReply,
 342         OnPluginMsgReceiveTextReply)
 343     PPAPI_DISPATCH_PLUGIN_RESOURCE_CALL(
 344         PpapiPluginMsg_WebSocket_ReceiveBinaryReply,
 345         OnPluginMsgReceiveBinaryReply)
 346     PPAPI_DISPATCH_PLUGIN_RESOURCE_CALL_0(
 347         PpapiPluginMsg_WebSocket_ErrorReply,
 348         OnPluginMsgErrorReply)
 349     PPAPI_DISPATCH_PLUGIN_RESOURCE_CALL(
 350         PpapiPluginMsg_WebSocket_BufferedAmountReply,
 351         OnPluginMsgBufferedAmountReply)
 352     PPAPI_DISPATCH_PLUGIN_RESOURCE_CALL(
 353         PpapiPluginMsg_WebSocket_StateReply,
 354         OnPluginMsgStateReply)
 355     PPAPI_DISPATCH_PLUGIN_RESOURCE_CALL(
 356         PpapiPluginMsg_WebSocket_ClosedReply,
 357         OnPluginMsgClosedReply)
 358     PPAPI_DISPATCH_PLUGIN_RESOURCE_CALL_UNHANDLED(NOTREACHED())
 359   IPC_END_MESSAGE_MAP()
 360 }
 361
 362 void WebSocketResource::OnPluginMsgConnectReply(
 363     const ResourceMessageReplyParams& params,
 364     const std::string& url,
 365     const std::string& protocol) {
 366   if (!TrackedCallback::IsPending(connect_callback_) ||
 367       TrackedCallback::IsScheduledToRun(connect_callback_)) {
 368     return;
 369   }
 370
 371   int32_t result = params.result();
 372   if (result == PP_OK) {
 373     state_ = PP_WEBSOCKETREADYSTATE_OPEN;
 374     protocol_ = new StringVar(protocol);
 375     url_ = new StringVar(url);
 376   }
 377   connect_callback_->Run(params.result());
 378 }
 379
 380 void WebSocketResource::OnPluginMsgCloseReply(
 381     const ResourceMessageReplyParams& params,
 382     unsigned long buffered_amount,
 383     bool was_clean,
 384     unsigned short code,
 385     const std::string& reason) {
 386   // Set close related properties.
 387   state_ = PP_WEBSOCKETREADYSTATE_CLOSED;
 388   buffered_amount_ = buffered_amount;
 389   close_was_clean_ = PP_FromBool(was_clean);
 390   close_code_ = code;
 391   close_reason_ = new StringVar(reason);
 392
 393   if (TrackedCallback::IsPending(receive_callback_)) {
 394     receive_callback_var_ = NULL;
 395     if (!TrackedCallback::IsScheduledToRun(receive_callback_))
 396       receive_callback_->PostRun(PP_ERROR_FAILED);
 397     receive_callback_ = NULL;
 398   }
 399
 400   if (TrackedCallback::IsPending(close_callback_)) {
 401     if (!TrackedCallback::IsScheduledToRun(close_callback_))
 402       close_callback_->PostRun(params.result());
 403     close_callback_ = NULL;
 404   }
 405 }
 406
 407 void WebSocketResource::OnPluginMsgReceiveTextReply(
 408     const ResourceMessageReplyParams& params,
 409     const std::string& message) {
 410   // Dispose packets after receiving an error or in invalid state.
 411   if (error_was_received_ || !InValidStateToReceive(state_))
 412     return;
 413
 414   // Append received data to queue.
 415   received_messages_.push(scoped_refptr<Var>(new StringVar(message)));
 416
 417   if (!TrackedCallback::IsPending(receive_callback_) ||
 418       TrackedCallback::IsScheduledToRun(receive_callback_)) {
 419     return;
 420   }
 421
 422   receive_callback_->Run(DoReceive());
 423 }
 424
 425 void WebSocketResource::OnPluginMsgReceiveBinaryReply(
 426     const ResourceMessageReplyParams& params,
 427     const std::vector<uint8_t>& message) {
 428   // Dispose packets after receiving an error or in invalid state.
 429   if (error_was_received_ || !InValidStateToReceive(state_))
 430     return;
 431
 432   // Append received data to queue.
 433   scoped_refptr<Var> message_var(
 434       PpapiGlobals::Get()->GetVarTracker()->MakeArrayBufferVar(
 435           message.size(),
 436           &message.front()));
 437   received_messages_.push(message_var);
 438
 439   if (!TrackedCallback::IsPending(receive_callback_) ||
 440       TrackedCallback::IsScheduledToRun(receive_callback_)) {
 441     return;
 442   }
 443
 444   receive_callback_->Run(DoReceive());
 445 }
 446
 447 void WebSocketResource::OnPluginMsgErrorReply(
 448     const ResourceMessageReplyParams& params) {
 449   error_was_received_ = true;
 450
 451   if (!TrackedCallback::IsPending(receive_callback_) ||
 452       TrackedCallback::IsScheduledToRun(receive_callback_)) {
 453     return;
 454   }
 455
 456   // No more text or binary messages will be received. If there is ongoing
 457   // ReceiveMessage(), we must invoke the callback with error code here.
 458   receive_callback_var_ = NULL;
 459   receive_callback_->Run(PP_ERROR_FAILED);
 460 }
 461
 462 void WebSocketResource::OnPluginMsgBufferedAmountReply(
 463     const ResourceMessageReplyParams& params,
 464     unsigned long buffered_amount) {
 465   buffered_amount_ = buffered_amount;
 466 }
 467
 468 void WebSocketResource::OnPluginMsgStateReply(
 469     const ResourceMessageReplyParams& params,
 470     int32_t state) {
 471   state_ = static_cast<PP_WebSocketReadyState>(state);
 472 }
 473
 474 void WebSocketResource::OnPluginMsgClosedReply(
 475     const ResourceMessageReplyParams& params,
 476     unsigned long buffered_amount,
 477     bool was_clean,
 478     unsigned short code,
 479     const std::string& reason) {
 480   OnPluginMsgCloseReply(params, buffered_amount, was_clean, code, reason);
 481 }
 482
 483 int32_t WebSocketResource::DoReceive() {
 484   if (!receive_callback_var_)
 485     return PP_OK;
 486
 487   *receive_callback_var_ = received_messages_.front()->GetPPVar();
 488   received_messages_.pop();
 489   receive_callback_var_ = NULL;
 490   return PP_OK;
 491 }
 492
 493 }  // namespace proxy
 494 }  // namespace ppapi