net/test/embedded_test_server/http_request.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/test/embedded_test_server/http_request.h"
   6
   7 #include <algorithm>
   8
   9 #include "base/logging.h"
  10 #include "base/strings/string_util.h"
  11 #include "base/strings/string_number_conversions.h"
  12 #include "base/strings/string_split.h"
  13 #include "net/http/http_chunked_decoder.h"
  14
  15 namespace net {
  16 namespace test_server {
  17
  18 namespace {
  19
  20 size_t kRequestSizeLimit = 64 * 1024 * 1024;  // 64 mb.
  21
  22 // Helper function used to trim tokens in http request headers.
  23 std::string Trim(const std::string& value) {
  24   std::string result;
  25   base::TrimString(value, " \t", &result);
  26   return result;
  27 }
  28
  29 }  // namespace
  30
  31 HttpRequest::HttpRequest() : method(METHOD_UNKNOWN),
  32                              has_content(false) {
  33 }
  34
  35 HttpRequest::~HttpRequest() {
  36 }
  37
  38 HttpRequestParser::HttpRequestParser()
  39     : http_request_(new HttpRequest()),
  40       buffer_position_(0),
  41       state_(STATE_HEADERS),
  42       declared_content_length_(0) {
  43 }
  44
  45 HttpRequestParser::~HttpRequestParser() {
  46 }
  47
  48 void HttpRequestParser::ProcessChunk(const base::StringPiece& data) {
  49   data.AppendToString(&buffer_);
  50   DCHECK_LE(buffer_.size() + data.size(), kRequestSizeLimit) <<
  51       "The HTTP request is too large.";
  52 }
  53
  54 std::string HttpRequestParser::ShiftLine() {
  55   size_t eoln_position = buffer_.find("\r\n", buffer_position_);
  56   DCHECK_NE(std::string::npos, eoln_position);
  57   const int line_length = eoln_position - buffer_position_;
  58   std::string result = buffer_.substr(buffer_position_, line_length);
  59   buffer_position_ += line_length + 2;
  60   return result;
  61 }
  62
  63 HttpRequestParser::ParseResult HttpRequestParser::ParseRequest() {
  64   DCHECK_NE(STATE_ACCEPTED, state_);
  65   // Parse the request from beginning. However, entire request may not be
  66   // available in the buffer.
  67   if (state_ == STATE_HEADERS) {
  68     if (ParseHeaders() == ACCEPTED)
  69       return ACCEPTED;
  70   }
  71   // This should not be 'else if' of the previous block, as |state_| can be
  72   // changed in ParseHeaders().
  73   if (state_ == STATE_CONTENT) {
  74     if (ParseContent() == ACCEPTED)
  75       return ACCEPTED;
  76   }
  77   return WAITING;
  78 }
  79
  80 HttpRequestParser::ParseResult HttpRequestParser::ParseHeaders() {
  81   // Check if the all request headers are available.
  82   if (buffer_.find("\r\n\r\n", buffer_position_) == std::string::npos)
  83     return WAITING;
  84
  85   // Parse request's the first header line.
  86   // Request main main header, eg. GET /foobar.html HTTP/1.1
  87   std::string request_headers;
  88   {
  89     const std::string header_line = ShiftLine();
  90     http_request_->all_headers += header_line + "\r\n";
  91     std::vector<std::string> header_line_tokens = base::SplitString(
  92         header_line, " ", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
  93     DCHECK_EQ(3u, header_line_tokens.size());
  94     // Method.
  95     http_request_->method_string = header_line_tokens[0];
  96     http_request_->method =
  97         GetMethodType(base::ToLowerASCII(header_line_tokens[0]));
  98     // Address.
  99     // Don't build an absolute URL as the parser does not know (should not
 100     // know) anything about the server address.
 101     http_request_->relative_url = header_line_tokens[1];
 102     // Protocol.
 103     const std::string protocol = base::ToLowerASCII(header_line_tokens[2]);
 104     CHECK(protocol == "http/1.0" || protocol == "http/1.1") <<
 105         "Protocol not supported: " << protocol;
 106   }
 107
 108   // Parse further headers.
 109   {
 110     std::string header_name;
 111     while (true) {
 112       std::string header_line = ShiftLine();
 113       if (header_line.empty())
 114         break;
 115
 116       http_request_->all_headers += header_line + "\r\n";
 117       if (header_line[0] == ' ' || header_line[0] == '\t') {
 118         // Continuation of the previous multi-line header.
 119         std::string header_value =
 120             Trim(header_line.substr(1, header_line.size() - 1));
 121         http_request_->headers[header_name] += " " + header_value;
 122       } else {
 123         // New header.
 124         size_t delimiter_pos = header_line.find(":");
 125         DCHECK_NE(std::string::npos, delimiter_pos) << "Syntax error.";
 126         header_name = Trim(header_line.substr(0, delimiter_pos));
 127         std::string header_value = Trim(header_line.substr(
 128             delimiter_pos + 1,
 129             header_line.size() - delimiter_pos - 1));
 130         http_request_->headers[header_name] = header_value;
 131       }
 132     }
 133   }
 134
 135   // Headers done. Is any content data attached to the request?
 136   declared_content_length_ = 0;
 137   if (http_request_->headers.count("Content-Length") > 0) {
 138     http_request_->has_content = true;
 139     const bool success = base::StringToSizeT(
 140         http_request_->headers["Content-Length"],
 141         &declared_content_length_);
 142     DCHECK(success) << "Malformed Content-Length header's value.";
 143   } else if (http_request_->headers.count("Transfer-Encoding") > 0) {
 144     if (http_request_->headers["Transfer-Encoding"] == "chunked") {
 145       http_request_->has_content = true;
 146       chunked_decoder_.reset(new HttpChunkedDecoder());
 147       state_ = STATE_CONTENT;
 148       return WAITING;
 149     }
 150   }
 151   if (declared_content_length_ == 0) {
 152     // No content data, so parsing is finished.
 153     state_ = STATE_ACCEPTED;
 154     return ACCEPTED;
 155   }
 156
 157   // The request has not yet been parsed yet, content data is still to be
 158   // processed.
 159   state_ = STATE_CONTENT;
 160   return WAITING;
 161 }
 162
 163 HttpRequestParser::ParseResult HttpRequestParser::ParseContent() {
 164   const size_t available_bytes = buffer_.size() - buffer_position_;
 165   if (chunked_decoder_.get()) {
 166     int bytes_written = chunked_decoder_->FilterBuf(
 167         const_cast<char*>(buffer_.data()) + buffer_position_, available_bytes);
 168     http_request_->content.append(buffer_.data() + buffer_position_,
 169                                   bytes_written);
 170
 171     if (chunked_decoder_->reached_eof()) {
 172       buffer_ =
 173           buffer_.substr(buffer_.size() - chunked_decoder_->bytes_after_eof());
 174       buffer_position_ = 0;
 175       state_ = STATE_ACCEPTED;
 176       return ACCEPTED;
 177     }
 178     buffer_ = "";
 179     buffer_position_ = 0;
 180     state_ = STATE_CONTENT;
 181     return WAITING;
 182   }
 183
 184   const size_t fetch_bytes = std::min(
 185       available_bytes,
 186       declared_content_length_ - http_request_->content.size());
 187   http_request_->content.append(buffer_.data() + buffer_position_,
 188                                 fetch_bytes);
 189   buffer_position_ += fetch_bytes;
 190
 191   if (declared_content_length_ == http_request_->content.size()) {
 192     state_ = STATE_ACCEPTED;
 193     return ACCEPTED;
 194   }
 195
 196   state_ = STATE_CONTENT;
 197   return WAITING;
 198 }
 199
 200 scoped_ptr<HttpRequest> HttpRequestParser::GetRequest() {
 201   DCHECK_EQ(STATE_ACCEPTED, state_);
 202   scoped_ptr<HttpRequest> result = http_request_.Pass();
 203
 204   // Prepare for parsing a new request.
 205   state_ = STATE_HEADERS;
 206   http_request_.reset(new HttpRequest());
 207   buffer_.clear();
 208   buffer_position_ = 0;
 209   declared_content_length_ = 0;
 210
 211   return result.Pass();
 212 }
 213
 214 HttpMethod HttpRequestParser::GetMethodType(const std::string& token) const {
 215   if (token == "get") {
 216     return METHOD_GET;
 217   } else if (token == "head") {
 218     return METHOD_HEAD;
 219   } else if (token == "post") {
 220     return METHOD_POST;
 221   } else if (token == "put") {
 222     return METHOD_PUT;
 223   } else if (token == "delete") {
 224     return METHOD_DELETE;
 225   } else if (token == "patch") {
 226     return METHOD_PATCH;
 227   }
 228   NOTREACHED() << "Method not implemented: " << token;
 229   return METHOD_UNKNOWN;
 230 }
 231
 232 }  // namespace test_server
 233 }  // namespace net