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;
  92     base::SplitString(header_line, ' ', &header_line_tokens);
  93     DCHECK_EQ(3u, header_line_tokens.size());
  94     // Method.
  95     http_request_->method_string = header_line_tokens[0];
  96     http_request_->method = GetMethodType(base::StringToLowerASCII(
  97         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 =
 104         base::StringToLowerASCII(header_line_tokens[2]);
 105     CHECK(protocol == "http/1.0" || protocol == "http/1.1") <<
 106         "Protocol not supported: " << protocol;
 107   }
 108
 109   // Parse further headers.
 110   {
 111     std::string header_name;
 112     while (true) {
 113       std::string header_line = ShiftLine();
 114       if (header_line.empty())
 115         break;
 116
 117       http_request_->all_headers += header_line + "\r\n";
 118       if (header_line[0] == ' ' || header_line[0] == '\t') {
 119         // Continuation of the previous multi-line header.
 120         std::string header_value =
 121             Trim(header_line.substr(1, header_line.size() - 1));
 122         http_request_->headers[header_name] += " " + header_value;
 123       } else {
 124         // New header.
 125         size_t delimiter_pos = header_line.find(":");
 126         DCHECK_NE(std::string::npos, delimiter_pos) << "Syntax error.";
 127         header_name = Trim(header_line.substr(0, delimiter_pos));
 128         std::string header_value = Trim(header_line.substr(
 129             delimiter_pos + 1,
 130             header_line.size() - delimiter_pos - 1));
 131         http_request_->headers[header_name] = header_value;
 132       }
 133     }
 134   }
 135
 136   // Headers done. Is any content data attached to the request?
 137   declared_content_length_ = 0;
 138   if (http_request_->headers.count("Content-Length") > 0) {
 139     http_request_->has_content = true;
 140     const bool success = base::StringToSizeT(
 141         http_request_->headers["Content-Length"],
 142         &declared_content_length_);
 143     DCHECK(success) << "Malformed Content-Length header's value.";
 144   } else if (http_request_->headers.count("Transfer-Encoding") > 0) {
 145     if (http_request_->headers["Transfer-Encoding"] == "chunked") {
 146       http_request_->has_content = true;
 147       chunked_decoder_.reset(new HttpChunkedDecoder());
 148       state_ = STATE_CONTENT;
 149       return WAITING;
 150     }
 151   }
 152   if (declared_content_length_ == 0) {
 153     // No content data, so parsing is finished.
 154     state_ = STATE_ACCEPTED;
 155     return ACCEPTED;
 156   }
 157
 158   // The request has not yet been parsed yet, content data is still to be
 159   // processed.
 160   state_ = STATE_CONTENT;
 161   return WAITING;
 162 }
 163
 164 HttpRequestParser::ParseResult HttpRequestParser::ParseContent() {
 165   const size_t available_bytes = buffer_.size() - buffer_position_;
 166   if (chunked_decoder_.get()) {
 167     int bytes_written = chunked_decoder_->FilterBuf(
 168         const_cast<char*>(buffer_.data()) + buffer_position_, available_bytes);
 169     http_request_->content.append(buffer_.data() + buffer_position_,
 170                                   bytes_written);
 171
 172     if (chunked_decoder_->reached_eof()) {
 173       buffer_ =
 174           buffer_.substr(buffer_.size() - chunked_decoder_->bytes_after_eof());
 175       buffer_position_ = 0;
 176       state_ = STATE_ACCEPTED;
 177       return ACCEPTED;
 178     }
 179     buffer_ = "";
 180     buffer_position_ = 0;
 181     state_ = STATE_CONTENT;
 182     return WAITING;
 183   }
 184
 185   const size_t fetch_bytes = std::min(
 186       available_bytes,
 187       declared_content_length_ - http_request_->content.size());
 188   http_request_->content.append(buffer_.data() + buffer_position_,
 189                                 fetch_bytes);
 190   buffer_position_ += fetch_bytes;
 191
 192   if (declared_content_length_ == http_request_->content.size()) {
 193     state_ = STATE_ACCEPTED;
 194     return ACCEPTED;
 195   }
 196
 197   state_ = STATE_CONTENT;
 198   return WAITING;
 199 }
 200
 201 scoped_ptr<HttpRequest> HttpRequestParser::GetRequest() {
 202   DCHECK_EQ(STATE_ACCEPTED, state_);
 203   scoped_ptr<HttpRequest> result = http_request_.Pass();
 204
 205   // Prepare for parsing a new request.
 206   state_ = STATE_HEADERS;
 207   http_request_.reset(new HttpRequest());
 208   buffer_.clear();
 209   buffer_position_ = 0;
 210   declared_content_length_ = 0;
 211
 212   return result.Pass();
 213 }
 214
 215 HttpMethod HttpRequestParser::GetMethodType(const std::string& token) const {
 216   if (token == "get") {
 217     return METHOD_GET;
 218   } else if (token == "head") {
 219     return METHOD_HEAD;
 220   } else if (token == "post") {
 221     return METHOD_POST;
 222   } else if (token == "put") {
 223     return METHOD_PUT;
 224   } else if (token == "delete") {
 225     return METHOD_DELETE;
 226   } else if (token == "patch") {
 227     return METHOD_PATCH;
 228   }
 229   NOTREACHED() << "Method not implemented: " << token;
 230   return METHOD_UNKNOWN;
 231 }
 232
 233 }  // namespace test_server
 234 }  // namespace net