net/tools/quic/spdy_utils.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/tools/quic/spdy_utils.h"
   6
   7 #include <string>
   8
   9 #include "base/memory/scoped_ptr.h"
  10 #include "base/strings/string_number_conversions.h"
  11 #include "base/strings/string_piece.h"
  12 #include "base/strings/string_util.h"
  13 #include "net/spdy/spdy_frame_builder.h"
  14 #include "net/spdy/spdy_framer.h"
  15 #include "net/spdy/spdy_protocol.h"
  16 #include "net/tools/balsa/balsa_headers.h"
  17 #include "url/gurl.h"
  18
  19 using base::StringPiece;
  20 using std::pair;
  21 using std::string;
  22
  23 namespace net {
  24 namespace tools {
  25
  26 const char* const kV3Host = ":host";
  27 const char* const kV3Path = ":path";
  28 const char* const kV3Scheme = ":scheme";
  29 const char* const kV3Status = ":status";
  30 const char* const kV3Method = ":method";
  31 const char* const kV3Version = ":version";
  32
  33 void PopulateSpdyHeaderBlock(const BalsaHeaders& headers,
  34                              SpdyHeaderBlock* block,
  35                              bool allow_empty_values) {
  36   for (BalsaHeaders::const_header_lines_iterator hi =
  37        headers.header_lines_begin();
  38        hi != headers.header_lines_end();
  39        ++hi) {
  40     if ((hi->second.length() == 0) && !allow_empty_values) {
  41       DVLOG(1) << "Dropping empty header " << hi->first.as_string()
  42                << " from headers";
  43       continue;
  44     }
  45
  46     // This unfortunately involves loads of copying, but its the simplest way
  47     // to sort the headers and leverage the framer.
  48     string name = hi->first.as_string();
  49     base::StringToLowerASCII(&name);
  50     SpdyHeaderBlock::iterator it = block->find(name);
  51     if (it != block->end()) {
  52       it->second.reserve(it->second.size() + 1 + hi->second.size());
  53       it->second.append("\0", 1);
  54       it->second.append(hi->second.data(), hi->second.size());
  55     } else {
  56       block->insert(make_pair(name, hi->second.as_string()));
  57     }
  58   }
  59 }
  60
  61 void PopulateSpdy3RequestHeaderBlock(const BalsaHeaders& headers,
  62                                      const string& scheme,
  63                                      const string& host_and_port,
  64                                      const string& path,
  65                                      SpdyHeaderBlock* block) {
  66   PopulateSpdyHeaderBlock(headers, block, true);
  67   StringPiece host_header = headers.GetHeader("Host");
  68   if (!host_header.empty()) {
  69     DCHECK(host_and_port.empty() || host_header == host_and_port);
  70     block->insert(make_pair(kV3Host, host_header.as_string()));
  71   } else {
  72     block->insert(make_pair(kV3Host, host_and_port));
  73   }
  74   block->insert(make_pair(kV3Path, path));
  75   block->insert(make_pair(kV3Scheme, scheme));
  76
  77   if (!headers.request_method().empty()) {
  78     block->insert(make_pair(kV3Method, headers.request_method().as_string()));
  79   }
  80
  81   if (!headers.request_version().empty()) {
  82     (*block)[kV3Version] = headers.request_version().as_string();
  83   }
  84 }
  85
  86 void PopulateSpdyResponseHeaderBlock(const BalsaHeaders& headers,
  87                                      SpdyHeaderBlock* block) {
  88   string status = headers.response_code().as_string();
  89   status.append(" ");
  90   status.append(headers.response_reason_phrase().as_string());
  91   (*block)[kV3Status] = status;
  92   (*block)[kV3Version] =
  93       headers.response_version().as_string();
  94
  95   // Empty header values are only allowed because this is spdy3.
  96   PopulateSpdyHeaderBlock(headers, block, true);
  97 }
  98
  99 // static
 100 SpdyHeaderBlock SpdyUtils::RequestHeadersToSpdyHeaders(
 101     const BalsaHeaders& request_headers) {
 102   string scheme;
 103   string host_and_port;
 104   string path;
 105
 106   string url = request_headers.request_uri().as_string();
 107   if (url.empty() || url[0] == '/') {
 108     path = url;
 109   } else {
 110     GURL request_uri(url);
 111     if (request_headers.request_method() == "CONNECT") {
 112       path = url;
 113     } else {
 114       path = request_uri.path();
 115       if (!request_uri.query().empty()) {
 116         path = path + "?" + request_uri.query();
 117       }
 118       host_and_port = request_uri.host();
 119       scheme = request_uri.scheme();
 120     }
 121   }
 122
 123   DCHECK(!scheme.empty());
 124   DCHECK(!host_and_port.empty());
 125   DCHECK(!path.empty());
 126
 127   SpdyHeaderBlock block;
 128   PopulateSpdy3RequestHeaderBlock(
 129       request_headers, scheme, host_and_port, path, &block);
 130   if (block.find("host") != block.end()) {
 131     block.erase(block.find("host"));
 132   }
 133   return block;
 134 }
 135
 136 // static
 137 string SpdyUtils::SerializeRequestHeaders(const BalsaHeaders& request_headers) {
 138   SpdyHeaderBlock block = RequestHeadersToSpdyHeaders(request_headers);
 139   return SerializeUncompressedHeaders(block);
 140 }
 141
 142 // static
 143 SpdyHeaderBlock SpdyUtils::ResponseHeadersToSpdyHeaders(
 144     const BalsaHeaders& response_headers) {
 145   SpdyHeaderBlock block;
 146   PopulateSpdyResponseHeaderBlock(response_headers, &block);
 147   return block;
 148 }
 149
 150 // static
 151 string SpdyUtils::SerializeResponseHeaders(
 152     const BalsaHeaders& response_headers) {
 153   SpdyHeaderBlock block = ResponseHeadersToSpdyHeaders(response_headers);
 154
 155   return SerializeUncompressedHeaders(block);
 156 }
 157
 158 // static
 159 string SpdyUtils::SerializeUncompressedHeaders(const SpdyHeaderBlock& headers) {
 160   size_t length = SpdyFramer::GetSerializedLength(SPDY3, &headers);
 161   SpdyFrameBuilder builder(length, SPDY3);
 162   SpdyFramer::WriteHeaderBlock(&builder, SPDY3, &headers);
 163   scoped_ptr<SpdyFrame> block(builder.take());
 164   return string(block->data(), length);
 165 }
 166
 167 bool IsSpecialSpdyHeader(SpdyHeaderBlock::const_iterator header,
 168                             BalsaHeaders* headers) {
 169   if (header->first.empty() || header->second.empty()) {
 170     return true;
 171   }
 172   const string& header_name = header->first;
 173   return header_name.c_str()[0] == ':';
 174 }
 175
 176 bool SpdyUtils::FillBalsaRequestHeaders(
 177     const SpdyHeaderBlock& header_block,
 178     BalsaHeaders* request_headers) {
 179   typedef SpdyHeaderBlock::const_iterator BlockIt;
 180
 181   BlockIt host_it = header_block.find(kV3Host);
 182   BlockIt path_it = header_block.find(kV3Path);
 183   BlockIt scheme_it = header_block.find(kV3Scheme);
 184   BlockIt method_it = header_block.find(kV3Method);
 185   BlockIt end_it = header_block.end();
 186   if (host_it == end_it || path_it == end_it || scheme_it == end_it ||
 187       method_it == end_it) {
 188     return false;
 189   }
 190   string url = scheme_it->second;
 191   url.append("://");
 192   url.append(host_it->second);
 193   url.append(path_it->second);
 194   request_headers->SetRequestUri(url);
 195   request_headers->SetRequestMethod(method_it->second);
 196
 197   BlockIt cl_it = header_block.find("content-length");
 198   if (cl_it != header_block.end()) {
 199     int content_length;
 200     if (!base::StringToInt(cl_it->second, &content_length)) {
 201       return false;
 202     }
 203     request_headers->SetContentLength(content_length);
 204   }
 205
 206   for (BlockIt it = header_block.begin(); it != header_block.end(); ++it) {
 207    if (!IsSpecialSpdyHeader(it, request_headers)) {
 208      request_headers->AppendHeader(it->first, it->second);
 209    }
 210   }
 211
 212   return true;
 213 }
 214
 215 // The reason phrase should match regexp [\d\d\d [^\r\n]+].  If not, we will
 216 // fail to parse it.
 217 bool ParseReasonAndStatus(StringPiece status_and_reason,
 218                           BalsaHeaders* headers) {
 219   if (status_and_reason.size() < 5)
 220     return false;
 221
 222   if (status_and_reason[3] != ' ')
 223     return false;
 224
 225   const StringPiece status_str = StringPiece(status_and_reason.data(), 3);
 226   int status;
 227   if (!base::StringToInt(status_str, &status)) {
 228     return false;
 229   }
 230
 231   headers->SetResponseCode(status_str);
 232   headers->set_parsed_response_code(status);
 233
 234   StringPiece reason(status_and_reason.data() + 4,
 235                      status_and_reason.length() - 4);
 236
 237   headers->SetResponseReasonPhrase(reason);
 238   return true;
 239 }
 240
 241 bool SpdyUtils::FillBalsaResponseHeaders(
 242     const SpdyHeaderBlock& header_block,
 243     BalsaHeaders* request_headers) {
 244   typedef SpdyHeaderBlock::const_iterator BlockIt;
 245
 246   BlockIt status_it = header_block.find(kV3Status);
 247   BlockIt version_it = header_block.find(kV3Version);
 248   BlockIt end_it = header_block.end();
 249   if (status_it == end_it || version_it == end_it) {
 250     return false;
 251   }
 252
 253   if (!ParseReasonAndStatus(status_it->second, request_headers)) {
 254     return false;
 255   }
 256   request_headers->SetResponseVersion(version_it->second);
 257   for (BlockIt it = header_block.begin(); it != header_block.end(); ++it) {
 258    if (!IsSpecialSpdyHeader(it, request_headers)) {
 259      request_headers->AppendHeader(it->first, it->second);
 260    }
 261   }
 262   return true;
 263 }
 264
 265 }  // namespace tools
 266 }  // namespace net