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