http_request.cc revision 868fa2fe829687343ffae624259930155e16dbd8 
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
14namespace net {
15namespace test_server {
16
17namespace {
18
19size_t kRequestSizeLimit = 64 * 1024 * 1024;  // 64 mb.
20
21// Helper function used to trim tokens in http request headers.
22std::string Trim(const std::string& value) {
23  std::string result;
24  TrimString(value, " \t", &result);
25  return result;
26}
27
28}  // namespace
29
30HttpRequest::HttpRequest() : method(METHOD_UNKNOWN),
31                             has_content(false) {
32}
33
34HttpRequest::~HttpRequest() {
35}
36
37HttpRequestParser::HttpRequestParser()
38    : http_request_(new HttpRequest()),
39      buffer_position_(0),
40      state_(STATE_HEADERS),
41      declared_content_length_(0) {
42}
43
44HttpRequestParser::~HttpRequestParser() {
45}
46
47void 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
53std::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
62HttpRequestParser::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
79HttpRequestParser::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
151HttpRequestParser::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
169scoped_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
183HttpMethod 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 net
203