net/tools/quic/spdy_balsa_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_balsa_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/quic/spdy_utils.h"
  14 #include "net/spdy/spdy_frame_builder.h"
  15 #include "net/spdy/spdy_framer.h"
  16 #include "net/spdy/spdy_protocol.h"
  17 #include "net/tools/balsa/balsa_headers.h"
  18 #include "url/gurl.h"
  19
  20 using base::StringPiece;
  21 using std::make_pair;
  22 using std::pair;
  23 using std::string;
  24
  25 namespace net {
  26 namespace tools {
  27 namespace {
  28
  29 const char kV4Host[] = ":authority";
  30
  31 const char kV3Host[] = ":host";
  32 const char kV3Path[] = ":path";
  33 const char kV3Scheme[] = ":scheme";
  34 const char kV3Method[] = ":method";
  35 const char kV3Status[] = ":status";
  36 const char kV3Version[] = ":version";
  37
  38 void PopulateSpdyHeaderBlock(const BalsaHeaders& headers,
  39                              SpdyHeaderBlock* block,
  40                              bool allow_empty_values) {
  41   for (BalsaHeaders::const_header_lines_iterator hi =
  42            headers.header_lines_begin();
  43        hi != headers.header_lines_end(); ++hi) {
  44     if ((hi->second.length() == 0) && !allow_empty_values) {
  45       DVLOG(1) << "Dropping empty header " << hi->first.as_string()
  46                << " from headers";
  47       continue;
  48     }
  49
  50     // This unfortunately involves loads of copying, but its the simplest way
  51     // to sort the headers and leverage the framer.
  52     string name = hi->first.as_string();
  53     base::StringToLowerASCII(&name);
  54     SpdyHeaderBlock::iterator it = block->find(name);
  55     if (it != block->end()) {
  56       it->second.reserve(it->second.size() + 1 + hi->second.size());
  57       it->second.append("\0", 1);
  58       it->second.append(hi->second.data(), hi->second.size());
  59     } else {
  60       block->insert(make_pair(name, hi->second.as_string()));
  61     }
  62   }
  63 }
  64
  65 void PopulateSpdy3RequestHeaderBlock(const BalsaHeaders& headers,
  66                                      const string& scheme,
  67                                      const string& host_and_port,
  68                                      const string& path,
  69                                      SpdyHeaderBlock* block) {
  70   PopulateSpdyHeaderBlock(headers, block, true);
  71   StringPiece host_header = headers.GetHeader("Host");
  72   if (!host_header.empty()) {
  73     DCHECK(host_and_port.empty() || host_header == host_and_port);
  74     block->insert(make_pair(kV3Host, host_header.as_string()));
  75   } else {
  76     block->insert(make_pair(kV3Host, host_and_port));
  77   }
  78   block->insert(make_pair(kV3Path, path));
  79   block->insert(make_pair(kV3Scheme, scheme));
  80
  81   if (!headers.request_method().empty()) {
  82     block->insert(make_pair(kV3Method, headers.request_method().as_string()));
  83   }
  84
  85   if (!headers.request_version().empty()) {
  86     (*block)[kV3Version] = headers.request_version().as_string();
  87   }
  88 }
  89
  90 void PopulateSpdy4RequestHeaderBlock(const BalsaHeaders& headers,
  91                                      const string& scheme,
  92                                      const string& host_and_port,
  93                                      const string& path,
  94                                      SpdyHeaderBlock* block) {
  95   PopulateSpdyHeaderBlock(headers, block, true);
  96   StringPiece host_header = headers.GetHeader("Host");
  97   if (!host_header.empty()) {
  98     DCHECK(host_and_port.empty() || host_header == host_and_port);
  99     block->insert(make_pair(kV4Host, host_header.as_string()));
 100     // PopulateSpdyHeaderBlock already added the "host" header,
 101     // which is invalid for SPDY4.
 102     block->erase("host");
 103   } else {
 104     block->insert(make_pair(kV4Host, host_and_port));
 105   }
 106   block->insert(make_pair(kV3Path, path));
 107   block->insert(make_pair(kV3Scheme, scheme));
 108
 109   if (!headers.request_method().empty()) {
 110     block->insert(make_pair(kV3Method, headers.request_method().as_string()));
 111   }
 112 }
 113
 114 void PopulateSpdyResponseHeaderBlock(SpdyMajorVersion version,
 115                                      const BalsaHeaders& headers,
 116                                      SpdyHeaderBlock* block) {
 117   if (version <= SPDY3) {
 118     string status = headers.response_code().as_string();
 119     status.append(" ");
 120     status.append(headers.response_reason_phrase().as_string());
 121     (*block)[kV3Status] = status;
 122     (*block)[kV3Version] = headers.response_version().as_string();
 123   } else {
 124     (*block)[kV3Status] = headers.response_code().as_string();
 125   }
 126
 127   PopulateSpdyHeaderBlock(headers, block, true);
 128 }
 129
 130 bool IsSpecialSpdyHeader(SpdyHeaderBlock::const_iterator header,
 131                          BalsaHeaders* headers) {
 132   if (header->first.empty() || header->second.empty()) {
 133     return true;
 134   }
 135   const string& header_name = header->first;
 136   return header_name.c_str()[0] == ':';
 137 }
 138
 139 // The reason phrase should match regexp [\d\d\d [^\r\n]+].  If not, we will
 140 // fail to parse it.
 141 bool ParseReasonAndStatus(StringPiece status_and_reason,
 142                           BalsaHeaders* headers,
 143                           QuicVersion quic_version) {
 144   if (quic_version > QUIC_VERSION_24) {
 145     int status;
 146     if (!base::StringToInt(status_and_reason, &status)) {
 147       return false;
 148     }
 149     headers->SetResponseCode(status_and_reason);
 150     headers->SetResponseCode(status_and_reason);
 151     headers->set_parsed_response_code(status);
 152     return true;
 153   }
 154
 155   if (status_and_reason.size() < 5)
 156     return false;
 157
 158   if (status_and_reason[3] != ' ')
 159     return false;
 160
 161   const StringPiece status_str = StringPiece(status_and_reason.data(), 3);
 162   int status;
 163   if (!base::StringToInt(status_str, &status)) {
 164     return false;
 165   }
 166
 167   headers->SetResponseCode(status_str);
 168   headers->set_parsed_response_code(status);
 169
 170   StringPiece reason(status_and_reason.data() + 4,
 171                      status_and_reason.length() - 4);
 172
 173   headers->SetResponseReasonPhrase(reason);
 174   return true;
 175 }
 176
 177 }  // namespace
 178
 179 // static
 180 SpdyHeaderBlock SpdyBalsaUtils::RequestHeadersToSpdyHeaders(
 181     const BalsaHeaders& request_headers,
 182     QuicVersion quic_version) {
 183   string scheme;
 184   string host_and_port;
 185   string path;
 186
 187   string url = request_headers.request_uri().as_string();
 188   if (url.empty() || url[0] == '/') {
 189     path = url;
 190   } else {
 191     GURL request_uri(url);
 192     if (request_headers.request_method() == "CONNECT") {
 193       path = url;
 194     } else {
 195       path = request_uri.path();
 196       if (!request_uri.query().empty()) {
 197         path = path + "?" + request_uri.query();
 198       }
 199       host_and_port = request_uri.host();
 200       scheme = request_uri.scheme();
 201     }
 202   }
 203
 204   DCHECK(!scheme.empty());
 205   DCHECK(!host_and_port.empty());
 206   DCHECK(!path.empty());
 207
 208   SpdyHeaderBlock block;
 209   if (net::SpdyUtils::GetSpdyVersionForQuicVersion(quic_version) == SPDY3) {
 210     PopulateSpdy3RequestHeaderBlock(request_headers, scheme, host_and_port,
 211                                     path, &block);
 212   } else {
 213     PopulateSpdy4RequestHeaderBlock(request_headers, scheme, host_and_port,
 214                                     path, &block);
 215   }
 216   if (block.find("host") != block.end()) {
 217     block.erase(block.find("host"));
 218   }
 219   return block;
 220 }
 221
 222 // static
 223 SpdyHeaderBlock SpdyBalsaUtils::ResponseHeadersToSpdyHeaders(
 224     const BalsaHeaders& response_headers,
 225     QuicVersion quic_version) {
 226   SpdyHeaderBlock block;
 227   PopulateSpdyResponseHeaderBlock(
 228       net::SpdyUtils::GetSpdyVersionForQuicVersion(quic_version),
 229       response_headers, &block);
 230   return block;
 231 }
 232
 233 // static
 234 string SpdyBalsaUtils::SerializeResponseHeaders(
 235     const BalsaHeaders& response_headers,
 236     QuicVersion quic_version) {
 237   SpdyHeaderBlock block =
 238       ResponseHeadersToSpdyHeaders(response_headers, quic_version);
 239
 240   return net::SpdyUtils::SerializeUncompressedHeaders(block, quic_version);
 241 }
 242
 243 // static
 244 void SpdyBalsaUtils::SpdyHeadersToResponseHeaders(
 245     const SpdyHeaderBlock& header_block,
 246     BalsaHeaders* request_headers,
 247     QuicVersion quic_version) {
 248   typedef SpdyHeaderBlock::const_iterator BlockIt;
 249
 250   BlockIt status_it = header_block.find(kV3Status);
 251   BlockIt version_it = header_block.find(kV3Version);
 252   BlockIt end_it = header_block.end();
 253   if (quic_version > QUIC_VERSION_24) {
 254     if (status_it == end_it) {
 255       return;
 256     }
 257   } else {
 258     if (status_it == end_it || version_it == end_it) {
 259       return;
 260     }
 261   }
 262
 263   if (!ParseReasonAndStatus(status_it->second, request_headers, quic_version)) {
 264     return;
 265   }
 266
 267   if (quic_version <= QUIC_VERSION_24) {
 268     request_headers->SetResponseVersion(version_it->second);
 269   }
 270   for (BlockIt it = header_block.begin(); it != header_block.end(); ++it) {
 271     if (!IsSpecialSpdyHeader(it, request_headers)) {
 272       request_headers->AppendHeader(it->first, it->second);
 273     }
 274   }
 275 }
 276
 277 }  // namespace tools
 278 }  // namespace net