net/server/web_socket.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 "net/server/web_socket.h"
   6
   7 #include "base/base64.h"
   8 #include "base/logging.h"
   9 #include "base/sha1.h"
  10 #include "base/strings/string_number_conversions.h"
  11 #include "base/strings/stringprintf.h"
  12 #include "base/sys_byteorder.h"
  13 #include "net/server/http_connection.h"
  14 #include "net/server/http_server.h"
  15 #include "net/server/http_server_request_info.h"
  16 #include "net/server/http_server_response_info.h"
  17 #include "net/server/web_socket_encoder.h"
  18
  19 namespace net {
  20
  21 WebSocket::WebSocket(HttpServer* server,
  22                      HttpConnection* connection,
  23                      const HttpServerRequestInfo& request)
  24     : server_(server), connection_(connection), closed_(false) {
  25   std::string request_extensions =
  26       request.GetHeaderValue("sec-websocket-extensions");
  27   encoder_.reset(WebSocketEncoder::CreateServer(request_extensions,
  28                                                 &response_extensions_));
  29   if (!response_extensions_.empty()) {
  30     response_extensions_ =
  31         "Sec-WebSocket-Extensions: " + response_extensions_ + "\r\n";
  32   }
  33 }
  34
  35 WebSocket::~WebSocket() {}
  36
  37 WebSocket* WebSocket::CreateWebSocket(HttpServer* server,
  38                                       HttpConnection* connection,
  39                                       const HttpServerRequestInfo& request) {
  40   std::string version = request.GetHeaderValue("sec-websocket-version");
  41   if (version != "8" && version != "13") {
  42     server->SendResponse(
  43         connection->id(),
  44         HttpServerResponseInfo::CreateFor500(
  45             "Invalid request format. The version is not valid."));
  46     return nullptr;
  47   }
  48
  49   std::string key = request.GetHeaderValue("sec-websocket-key");
  50   if (key.empty()) {
  51     server->SendResponse(
  52         connection->id(),
  53         HttpServerResponseInfo::CreateFor500(
  54             "Invalid request format. Sec-WebSocket-Key is empty or isn't "
  55             "specified."));
  56     return nullptr;
  57   }
  58   return new WebSocket(server, connection, request);
  59 }
  60
  61 void WebSocket::Accept(const HttpServerRequestInfo& request) {
  62   static const char* const kWebSocketGuid =
  63       "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
  64   std::string key = request.GetHeaderValue("sec-websocket-key");
  65   std::string data = base::StringPrintf("%s%s", key.c_str(), kWebSocketGuid);
  66   std::string encoded_hash;
  67   base::Base64Encode(base::SHA1HashString(data), &encoded_hash);
  68
  69   server_->SendRaw(
  70       connection_->id(),
  71       base::StringPrintf("HTTP/1.1 101 WebSocket Protocol Handshake\r\n"
  72                          "Upgrade: WebSocket\r\n"
  73                          "Connection: Upgrade\r\n"
  74                          "Sec-WebSocket-Accept: %s\r\n"
  75                          "%s"
  76                          "\r\n",
  77                          encoded_hash.c_str(), response_extensions_.c_str()));
  78 }
  79
  80 WebSocket::ParseResult WebSocket::Read(std::string* message) {
  81   HttpConnection::ReadIOBuffer* read_buf = connection_->read_buf();
  82   base::StringPiece frame(read_buf->StartOfBuffer(), read_buf->GetSize());
  83   int bytes_consumed = 0;
  84   ParseResult result = encoder_->DecodeFrame(frame, &bytes_consumed, message);
  85   if (result == FRAME_OK)
  86     read_buf->DidConsume(bytes_consumed);
  87   if (result == FRAME_CLOSE)
  88     closed_ = true;
  89   return result;
  90 }
  91
  92 void WebSocket::Send(const std::string& message) {
  93   if (closed_)
  94     return;
  95   std::string encoded;
  96   encoder_->EncodeFrame(message, 0, &encoded);
  97   server_->SendRaw(connection_->id(), encoded);
  98 }
  99
 100 }  // namespace net