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| 1 /* | |
| 2 * Copyright 2004 The WebRTC Project Authors. All rights reserved. | |
| 3 * | |
| 4 * Use of this source code is governed by a BSD-style license | |
| 5 * that can be found in the LICENSE file in the root of the source | |
| 6 * tree. An additional intellectual property rights grant can be found | |
| 7 * in the file PATENTS. All contributing project authors may | |
| 8 * be found in the AUTHORS file in the root of the source tree. | |
| 9 */ | |
| 10 | |
| 11 #include <time.h> | |
| 12 #include <algorithm> | |
| 13 #include <memory> | |
| 14 #include "webrtc/base/asyncsocket.h" | |
| 15 #include "webrtc/base/checks.h" | |
| 16 #include "webrtc/base/common.h" | |
| 17 #include "webrtc/base/diskcache.h" | |
| 18 #include "webrtc/base/httpclient.h" | |
| 19 #include "webrtc/base/httpcommon-inl.h" | |
| 20 #include "webrtc/base/logging.h" | |
| 21 #include "webrtc/base/pathutils.h" | |
| 22 #include "webrtc/base/socketstream.h" | |
| 23 #include "webrtc/base/stringencode.h" | |
| 24 #include "webrtc/base/stringutils.h" | |
| 25 #include "webrtc/base/thread.h" | |
| 26 | |
| 27 namespace rtc { | |
| 28 | |
| 29 ////////////////////////////////////////////////////////////////////// | |
| 30 // Helpers | |
| 31 ////////////////////////////////////////////////////////////////////// | |
| 32 | |
| 33 namespace { | |
| 34 | |
| 35 const size_t kCacheHeader = 0; | |
| 36 const size_t kCacheBody = 1; | |
| 37 | |
| 38 // Convert decimal string to integer | |
| 39 bool HttpStringToUInt(const std::string& str, size_t* val) { | |
| 40 RTC_DCHECK(NULL != val); | |
| 41 char* eos = NULL; | |
| 42 *val = strtoul(str.c_str(), &eos, 10); | |
| 43 return (*eos == '\0'); | |
| 44 } | |
| 45 | |
| 46 bool HttpShouldCache(const HttpTransaction& t) { | |
| 47 bool verb_allows_cache = (t.request.verb == HV_GET) | |
| 48 || (t.request.verb == HV_HEAD); | |
| 49 bool is_range_response = t.response.hasHeader(HH_CONTENT_RANGE, NULL); | |
| 50 bool has_expires = t.response.hasHeader(HH_EXPIRES, NULL); | |
| 51 bool request_allows_cache = | |
| 52 has_expires || (std::string::npos != t.request.path.find('?')); | |
| 53 bool response_allows_cache = | |
| 54 has_expires || HttpCodeIsCacheable(t.response.scode); | |
| 55 | |
| 56 bool may_cache = verb_allows_cache | |
| 57 && request_allows_cache | |
| 58 && response_allows_cache | |
| 59 && !is_range_response; | |
| 60 | |
| 61 std::string value; | |
| 62 if (t.response.hasHeader(HH_CACHE_CONTROL, &value)) { | |
| 63 HttpAttributeList directives; | |
| 64 HttpParseAttributes(value.data(), value.size(), directives); | |
| 65 // Response Directives Summary: | |
| 66 // public - always cacheable | |
| 67 // private - do not cache in a shared cache | |
| 68 // no-cache - may cache, but must revalidate whether fresh or stale | |
| 69 // no-store - sensitive information, do not cache or store in any way | |
| 70 // max-age - supplants Expires for staleness | |
| 71 // s-maxage - use as max-age for shared caches, ignore otherwise | |
| 72 // must-revalidate - may cache, but must revalidate after stale | |
| 73 // proxy-revalidate - shared cache must revalidate | |
| 74 if (HttpHasAttribute(directives, "no-store", NULL)) { | |
| 75 may_cache = false; | |
| 76 } else if (HttpHasAttribute(directives, "public", NULL)) { | |
| 77 may_cache = true; | |
| 78 } | |
| 79 } | |
| 80 return may_cache; | |
| 81 } | |
| 82 | |
| 83 enum HttpCacheState { | |
| 84 HCS_FRESH, // In cache, may use | |
| 85 HCS_STALE, // In cache, must revalidate | |
| 86 HCS_NONE // Not in cache | |
| 87 }; | |
| 88 | |
| 89 HttpCacheState HttpGetCacheState(const HttpTransaction& t) { | |
| 90 // Temporaries | |
| 91 std::string s_temp; | |
| 92 time_t u_temp; | |
| 93 | |
| 94 // Current time | |
| 95 time_t now = time(0); | |
| 96 | |
| 97 HttpAttributeList cache_control; | |
| 98 if (t.response.hasHeader(HH_CACHE_CONTROL, &s_temp)) { | |
| 99 HttpParseAttributes(s_temp.data(), s_temp.size(), cache_control); | |
| 100 } | |
| 101 | |
| 102 // Compute age of cache document | |
| 103 time_t date; | |
| 104 if (!t.response.hasHeader(HH_DATE, &s_temp) | |
| 105 || !HttpDateToSeconds(s_temp, &date)) | |
| 106 return HCS_NONE; | |
| 107 | |
| 108 // TODO: Timestamp when cache request sent and response received? | |
| 109 time_t request_time = date; | |
| 110 time_t response_time = date; | |
| 111 | |
| 112 time_t apparent_age = 0; | |
| 113 if (response_time > date) { | |
| 114 apparent_age = response_time - date; | |
| 115 } | |
| 116 | |
| 117 time_t corrected_received_age = apparent_age; | |
| 118 size_t i_temp; | |
| 119 if (t.response.hasHeader(HH_AGE, &s_temp) | |
| 120 && HttpStringToUInt(s_temp, (&i_temp))) { | |
| 121 u_temp = static_cast<time_t>(i_temp); | |
| 122 corrected_received_age = std::max(apparent_age, u_temp); | |
| 123 } | |
| 124 | |
| 125 time_t response_delay = response_time - request_time; | |
| 126 time_t corrected_initial_age = corrected_received_age + response_delay; | |
| 127 time_t resident_time = now - response_time; | |
| 128 time_t current_age = corrected_initial_age + resident_time; | |
| 129 | |
| 130 // Compute lifetime of document | |
| 131 time_t lifetime; | |
| 132 if (HttpHasAttribute(cache_control, "max-age", &s_temp)) { | |
| 133 lifetime = atoi(s_temp.c_str()); | |
| 134 } else if (t.response.hasHeader(HH_EXPIRES, &s_temp) | |
| 135 && HttpDateToSeconds(s_temp, &u_temp)) { | |
| 136 lifetime = u_temp - date; | |
| 137 } else if (t.response.hasHeader(HH_LAST_MODIFIED, &s_temp) | |
| 138 && HttpDateToSeconds(s_temp, &u_temp)) { | |
| 139 // TODO: Issue warning 113 if age > 24 hours | |
| 140 lifetime = static_cast<size_t>(now - u_temp) / 10; | |
| 141 } else { | |
| 142 return HCS_STALE; | |
| 143 } | |
| 144 | |
| 145 return (lifetime > current_age) ? HCS_FRESH : HCS_STALE; | |
| 146 } | |
| 147 | |
| 148 enum HttpValidatorStrength { | |
| 149 HVS_NONE, | |
| 150 HVS_WEAK, | |
| 151 HVS_STRONG | |
| 152 }; | |
| 153 | |
| 154 HttpValidatorStrength | |
| 155 HttpRequestValidatorLevel(const HttpRequestData& request) { | |
| 156 if (HV_GET != request.verb) | |
| 157 return HVS_STRONG; | |
| 158 return request.hasHeader(HH_RANGE, NULL) ? HVS_STRONG : HVS_WEAK; | |
| 159 } | |
| 160 | |
| 161 HttpValidatorStrength | |
| 162 HttpResponseValidatorLevel(const HttpResponseData& response) { | |
| 163 std::string value; | |
| 164 if (response.hasHeader(HH_ETAG, &value)) { | |
| 165 bool is_weak = (strnicmp(value.c_str(), "W/", 2) == 0); | |
| 166 return is_weak ? HVS_WEAK : HVS_STRONG; | |
| 167 } | |
| 168 if (response.hasHeader(HH_LAST_MODIFIED, &value)) { | |
| 169 time_t last_modified, date; | |
| 170 if (HttpDateToSeconds(value, &last_modified) | |
| 171 && response.hasHeader(HH_DATE, &value) | |
| 172 && HttpDateToSeconds(value, &date) | |
| 173 && (last_modified + 60 < date)) { | |
| 174 return HVS_STRONG; | |
| 175 } | |
| 176 return HVS_WEAK; | |
| 177 } | |
| 178 return HVS_NONE; | |
| 179 } | |
| 180 | |
| 181 std::string GetCacheID(const HttpRequestData& request) { | |
| 182 std::string id, url; | |
| 183 id.append(ToString(request.verb)); | |
| 184 id.append("_"); | |
| 185 request.getAbsoluteUri(&url); | |
| 186 id.append(url); | |
| 187 return id; | |
| 188 } | |
| 189 | |
| 190 } // anonymous namespace | |
| 191 | |
| 192 ////////////////////////////////////////////////////////////////////// | |
| 193 // Public Helpers | |
| 194 ////////////////////////////////////////////////////////////////////// | |
| 195 | |
| 196 bool HttpWriteCacheHeaders(const HttpResponseData* response, | |
| 197 StreamInterface* output, size_t* size) { | |
| 198 size_t length = 0; | |
| 199 // Write all unknown and end-to-end headers to a cache file | |
| 200 for (HttpData::const_iterator it = response->begin(); | |
| 201 it != response->end(); ++it) { | |
| 202 HttpHeader header; | |
| 203 if (FromString(header, it->first) && !HttpHeaderIsEndToEnd(header)) | |
| 204 continue; | |
| 205 length += it->first.length() + 2 + it->second.length() + 2; | |
| 206 if (!output) | |
| 207 continue; | |
| 208 std::string formatted_header(it->first); | |
| 209 formatted_header.append(": "); | |
| 210 formatted_header.append(it->second); | |
| 211 formatted_header.append("\r\n"); | |
| 212 StreamResult result = output->WriteAll(formatted_header.data(), | |
| 213 formatted_header.length(), | |
| 214 NULL, NULL); | |
| 215 if (SR_SUCCESS != result) { | |
| 216 return false; | |
| 217 } | |
| 218 } | |
| 219 if (output && (SR_SUCCESS != output->WriteAll("\r\n", 2, NULL, NULL))) { | |
| 220 return false; | |
| 221 } | |
| 222 length += 2; | |
| 223 if (size) | |
| 224 *size = length; | |
| 225 return true; | |
| 226 } | |
| 227 | |
| 228 bool HttpReadCacheHeaders(StreamInterface* input, HttpResponseData* response, | |
| 229 HttpData::HeaderCombine combine) { | |
| 230 while (true) { | |
| 231 std::string formatted_header; | |
| 232 StreamResult result = input->ReadLine(&formatted_header); | |
| 233 if ((SR_EOS == result) || (1 == formatted_header.size())) { | |
| 234 break; | |
| 235 } | |
| 236 if (SR_SUCCESS != result) { | |
| 237 return false; | |
| 238 } | |
| 239 size_t end_of_name = formatted_header.find(':'); | |
| 240 if (std::string::npos == end_of_name) { | |
| 241 LOG_F(LS_WARNING) << "Malformed cache header"; | |
| 242 continue; | |
| 243 } | |
| 244 size_t start_of_value = end_of_name + 1; | |
| 245 size_t end_of_value = formatted_header.length(); | |
| 246 while ((start_of_value < end_of_value) | |
| 247 && isspace(formatted_header[start_of_value])) | |
| 248 ++start_of_value; | |
| 249 while ((start_of_value < end_of_value) | |
| 250 && isspace(formatted_header[end_of_value-1])) | |
| 251 --end_of_value; | |
| 252 size_t value_length = end_of_value - start_of_value; | |
| 253 | |
| 254 std::string name(formatted_header.substr(0, end_of_name)); | |
| 255 std::string value(formatted_header.substr(start_of_value, value_length)); | |
| 256 response->changeHeader(name, value, combine); | |
| 257 } | |
| 258 return true; | |
| 259 } | |
| 260 | |
| 261 ////////////////////////////////////////////////////////////////////// | |
| 262 // HttpClient | |
| 263 ////////////////////////////////////////////////////////////////////// | |
| 264 | |
| 265 const size_t kDefaultRetries = 1; | |
| 266 const size_t kMaxRedirects = 5; | |
| 267 | |
| 268 HttpClient::HttpClient(const std::string& agent, StreamPool* pool, | |
| 269 HttpTransaction* transaction) | |
| 270 : agent_(agent), pool_(pool), | |
| 271 transaction_(transaction), free_transaction_(false), | |
| 272 retries_(kDefaultRetries), attempt_(0), redirects_(0), | |
| 273 redirect_action_(REDIRECT_DEFAULT), | |
| 274 uri_form_(URI_DEFAULT), cache_(NULL), cache_state_(CS_READY), | |
| 275 resolver_(NULL) { | |
| 276 base_.notify(this); | |
| 277 if (NULL == transaction_) { | |
| 278 free_transaction_ = true; | |
| 279 transaction_ = new HttpTransaction; | |
| 280 } | |
| 281 } | |
| 282 | |
| 283 HttpClient::~HttpClient() { | |
| 284 base_.notify(NULL); | |
| 285 base_.abort(HE_SHUTDOWN); | |
| 286 if (resolver_) { | |
| 287 resolver_->Destroy(false); | |
| 288 } | |
| 289 release(); | |
| 290 if (free_transaction_) | |
| 291 delete transaction_; | |
| 292 } | |
| 293 | |
| 294 void HttpClient::reset() { | |
| 295 server_.Clear(); | |
| 296 request().clear(true); | |
| 297 response().clear(true); | |
| 298 context_.reset(); | |
| 299 redirects_ = 0; | |
| 300 base_.abort(HE_OPERATION_CANCELLED); | |
| 301 } | |
| 302 | |
| 303 void HttpClient::OnResolveResult(AsyncResolverInterface* resolver) { | |
| 304 if (resolver != resolver_) { | |
| 305 return; | |
| 306 } | |
| 307 int error = resolver_->GetError(); | |
| 308 server_ = resolver_->address(); | |
| 309 resolver_->Destroy(false); | |
| 310 resolver_ = NULL; | |
| 311 if (error != 0) { | |
| 312 LOG(LS_ERROR) << "Error " << error << " resolving name: " | |
| 313 << server_; | |
| 314 onHttpComplete(HM_CONNECT, HE_CONNECT_FAILED); | |
| 315 } else { | |
| 316 connect(); | |
| 317 } | |
| 318 } | |
| 319 | |
| 320 void HttpClient::StartDNSLookup() { | |
| 321 resolver_ = new AsyncResolver(); | |
| 322 resolver_->SignalDone.connect(this, &HttpClient::OnResolveResult); | |
| 323 resolver_->Start(server_); | |
| 324 } | |
| 325 | |
| 326 void HttpClient::set_server(const SocketAddress& address) { | |
| 327 server_ = address; | |
| 328 // Setting 'Host' here allows it to be overridden before starting the request, | |
| 329 // if necessary. | |
| 330 request().setHeader(HH_HOST, HttpAddress(server_, false), true); | |
| 331 } | |
| 332 | |
| 333 StreamInterface* HttpClient::GetDocumentStream() { | |
| 334 return base_.GetDocumentStream(); | |
| 335 } | |
| 336 | |
| 337 void HttpClient::start() { | |
| 338 if (base_.mode() != HM_NONE) { | |
| 339 // call reset() to abort an in-progress request | |
| 340 RTC_NOTREACHED(); | |
| 341 return; | |
| 342 } | |
| 343 | |
| 344 RTC_DCHECK(!IsCacheActive()); | |
| 345 | |
| 346 if (request().hasHeader(HH_TRANSFER_ENCODING, NULL)) { | |
| 347 // Exact size must be known on the client. Instead of using chunked | |
| 348 // encoding, wrap data with auto-caching file or memory stream. | |
| 349 RTC_NOTREACHED(); | |
| 350 return; | |
| 351 } | |
| 352 | |
| 353 attempt_ = 0; | |
| 354 | |
| 355 // If no content has been specified, using length of 0. | |
| 356 request().setHeader(HH_CONTENT_LENGTH, "0", false); | |
| 357 | |
| 358 if (!agent_.empty()) { | |
| 359 request().setHeader(HH_USER_AGENT, agent_, false); | |
| 360 } | |
| 361 | |
| 362 UriForm uri_form = uri_form_; | |
| 363 if (PROXY_HTTPS == proxy_.type) { | |
| 364 // Proxies require absolute form | |
| 365 uri_form = URI_ABSOLUTE; | |
| 366 request().version = HVER_1_0; | |
| 367 request().setHeader(HH_PROXY_CONNECTION, "Keep-Alive", false); | |
| 368 } else { | |
| 369 request().setHeader(HH_CONNECTION, "Keep-Alive", false); | |
| 370 } | |
| 371 | |
| 372 if (URI_ABSOLUTE == uri_form) { | |
| 373 // Convert to absolute uri form | |
| 374 std::string url; | |
| 375 if (request().getAbsoluteUri(&url)) { | |
| 376 request().path = url; | |
| 377 } else { | |
| 378 LOG(LS_WARNING) << "Couldn't obtain absolute uri"; | |
| 379 } | |
| 380 } else if (URI_RELATIVE == uri_form) { | |
| 381 // Convert to relative uri form | |
| 382 std::string host, path; | |
| 383 if (request().getRelativeUri(&host, &path)) { | |
| 384 request().setHeader(HH_HOST, host); | |
| 385 request().path = path; | |
| 386 } else { | |
| 387 LOG(LS_WARNING) << "Couldn't obtain relative uri"; | |
| 388 } | |
| 389 } | |
| 390 | |
| 391 if ((NULL != cache_) && CheckCache()) { | |
| 392 return; | |
| 393 } | |
| 394 | |
| 395 connect(); | |
| 396 } | |
| 397 | |
| 398 void HttpClient::connect() { | |
| 399 int stream_err; | |
| 400 if (server_.IsUnresolvedIP()) { | |
| 401 StartDNSLookup(); | |
| 402 return; | |
| 403 } | |
| 404 StreamInterface* stream = pool_->RequestConnectedStream(server_, &stream_err); | |
| 405 if (stream == NULL) { | |
| 406 RTC_DCHECK(0 != stream_err); | |
| 407 LOG(LS_ERROR) << "RequestConnectedStream error: " << stream_err; | |
| 408 onHttpComplete(HM_CONNECT, HE_CONNECT_FAILED); | |
| 409 } else { | |
| 410 base_.attach(stream); | |
| 411 if (stream->GetState() == SS_OPEN) { | |
| 412 base_.send(&transaction_->request); | |
| 413 } | |
| 414 } | |
| 415 } | |
| 416 | |
| 417 void HttpClient::prepare_get(const std::string& url) { | |
| 418 reset(); | |
| 419 Url<char> purl(url); | |
| 420 set_server(SocketAddress(purl.host(), purl.port())); | |
| 421 request().verb = HV_GET; | |
| 422 request().path = purl.full_path(); | |
| 423 } | |
| 424 | |
| 425 void HttpClient::prepare_post(const std::string& url, | |
| 426 const std::string& content_type, | |
| 427 StreamInterface* request_doc) { | |
| 428 reset(); | |
| 429 Url<char> purl(url); | |
| 430 set_server(SocketAddress(purl.host(), purl.port())); | |
| 431 request().verb = HV_POST; | |
| 432 request().path = purl.full_path(); | |
| 433 request().setContent(content_type, request_doc); | |
| 434 } | |
| 435 | |
| 436 void HttpClient::release() { | |
| 437 if (StreamInterface* stream = base_.detach()) { | |
| 438 pool_->ReturnConnectedStream(stream); | |
| 439 } | |
| 440 } | |
| 441 | |
| 442 bool HttpClient::ShouldRedirect(std::string* location) const { | |
| 443 // TODO: Unittest redirection. | |
| 444 if ((REDIRECT_NEVER == redirect_action_) | |
| 445 || !HttpCodeIsRedirection(response().scode) | |
| 446 || !response().hasHeader(HH_LOCATION, location) | |
| 447 || (redirects_ >= kMaxRedirects)) | |
| 448 return false; | |
| 449 return (REDIRECT_ALWAYS == redirect_action_) | |
| 450 || (HC_SEE_OTHER == response().scode) | |
| 451 || (HV_HEAD == request().verb) | |
| 452 || (HV_GET == request().verb); | |
| 453 } | |
| 454 | |
| 455 bool HttpClient::BeginCacheFile() { | |
| 456 RTC_DCHECK(NULL != cache_); | |
| 457 RTC_DCHECK(CS_READY == cache_state_); | |
| 458 | |
| 459 std::string id = GetCacheID(request()); | |
| 460 CacheLock lock(cache_, id, true); | |
| 461 if (!lock.IsLocked()) { | |
| 462 LOG_F(LS_WARNING) << "Couldn't lock cache"; | |
| 463 return false; | |
| 464 } | |
| 465 | |
| 466 if (HE_NONE != WriteCacheHeaders(id)) { | |
| 467 return false; | |
| 468 } | |
| 469 | |
| 470 std::unique_ptr<StreamInterface> stream( | |
| 471 cache_->WriteResource(id, kCacheBody)); | |
| 472 if (!stream) { | |
| 473 LOG_F(LS_ERROR) << "Couldn't open body cache"; | |
| 474 return false; | |
| 475 } | |
| 476 lock.Commit(); | |
| 477 | |
| 478 // Let's secretly replace the response document with Folgers Crystals, | |
| 479 // er, StreamTap, so that we can mirror the data to our cache. | |
| 480 StreamInterface* output = response().document.release(); | |
| 481 if (!output) { | |
| 482 output = new NullStream; | |
| 483 } | |
| 484 StreamTap* tap = new StreamTap(output, stream.release()); | |
| 485 response().document.reset(tap); | |
| 486 return true; | |
| 487 } | |
| 488 | |
| 489 HttpError HttpClient::WriteCacheHeaders(const std::string& id) { | |
| 490 std::unique_ptr<StreamInterface> stream( | |
| 491 cache_->WriteResource(id, kCacheHeader)); | |
| 492 if (!stream) { | |
| 493 LOG_F(LS_ERROR) << "Couldn't open header cache"; | |
| 494 return HE_CACHE; | |
| 495 } | |
| 496 | |
| 497 if (!HttpWriteCacheHeaders(&transaction_->response, stream.get(), NULL)) { | |
| 498 LOG_F(LS_ERROR) << "Couldn't write header cache"; | |
| 499 return HE_CACHE; | |
| 500 } | |
| 501 | |
| 502 return HE_NONE; | |
| 503 } | |
| 504 | |
| 505 void HttpClient::CompleteCacheFile() { | |
| 506 // Restore previous response document | |
| 507 StreamTap* tap = static_cast<StreamTap*>(response().document.release()); | |
| 508 response().document.reset(tap->Detach()); | |
| 509 | |
| 510 int error; | |
| 511 StreamResult result = tap->GetTapResult(&error); | |
| 512 | |
| 513 // Delete the tap and cache stream (which completes cache unlock) | |
| 514 delete tap; | |
| 515 | |
| 516 if (SR_SUCCESS != result) { | |
| 517 LOG(LS_ERROR) << "Cache file error: " << error; | |
| 518 cache_->DeleteResource(GetCacheID(request())); | |
| 519 } | |
| 520 } | |
| 521 | |
| 522 bool HttpClient::CheckCache() { | |
| 523 RTC_DCHECK(NULL != cache_); | |
| 524 RTC_DCHECK(CS_READY == cache_state_); | |
| 525 | |
| 526 std::string id = GetCacheID(request()); | |
| 527 if (!cache_->HasResource(id)) { | |
| 528 // No cache file available | |
| 529 return false; | |
| 530 } | |
| 531 | |
| 532 HttpError error = ReadCacheHeaders(id, true); | |
| 533 | |
| 534 if (HE_NONE == error) { | |
| 535 switch (HttpGetCacheState(*transaction_)) { | |
| 536 case HCS_FRESH: | |
| 537 // Cache content is good, read from cache | |
| 538 break; | |
| 539 case HCS_STALE: | |
| 540 // Cache content may be acceptable. Issue a validation request. | |
| 541 if (PrepareValidate()) { | |
| 542 return false; | |
| 543 } | |
| 544 // Couldn't validate, fall through. | |
| 545 FALLTHROUGH(); | |
| 546 case HCS_NONE: | |
| 547 // Cache content is not useable. Issue a regular request. | |
| 548 response().clear(false); | |
| 549 return false; | |
| 550 } | |
| 551 } | |
| 552 | |
| 553 if (HE_NONE == error) { | |
| 554 error = ReadCacheBody(id); | |
| 555 cache_state_ = CS_READY; | |
| 556 } | |
| 557 | |
| 558 if (HE_CACHE == error) { | |
| 559 LOG_F(LS_WARNING) << "Cache failure, continuing with normal request"; | |
| 560 response().clear(false); | |
| 561 return false; | |
| 562 } | |
| 563 | |
| 564 SignalHttpClientComplete(this, error); | |
| 565 return true; | |
| 566 } | |
| 567 | |
| 568 HttpError HttpClient::ReadCacheHeaders(const std::string& id, bool override) { | |
| 569 std::unique_ptr<StreamInterface> stream( | |
| 570 cache_->ReadResource(id, kCacheHeader)); | |
| 571 if (!stream) { | |
| 572 return HE_CACHE; | |
| 573 } | |
| 574 | |
| 575 HttpData::HeaderCombine combine = | |
| 576 override ? HttpData::HC_REPLACE : HttpData::HC_AUTO; | |
| 577 | |
| 578 if (!HttpReadCacheHeaders(stream.get(), &transaction_->response, combine)) { | |
| 579 LOG_F(LS_ERROR) << "Error reading cache headers"; | |
| 580 return HE_CACHE; | |
| 581 } | |
| 582 | |
| 583 response().scode = HC_OK; | |
| 584 return HE_NONE; | |
| 585 } | |
| 586 | |
| 587 HttpError HttpClient::ReadCacheBody(const std::string& id) { | |
| 588 cache_state_ = CS_READING; | |
| 589 | |
| 590 HttpError error = HE_NONE; | |
| 591 | |
| 592 size_t data_size; | |
| 593 std::unique_ptr<StreamInterface> stream(cache_->ReadResource(id, kCacheBody)); | |
| 594 if (!stream || !stream->GetAvailable(&data_size)) { | |
| 595 LOG_F(LS_ERROR) << "Unavailable cache body"; | |
| 596 error = HE_CACHE; | |
| 597 } else { | |
| 598 error = OnHeaderAvailable(false, false, data_size); | |
| 599 } | |
| 600 | |
| 601 if ((HE_NONE == error) | |
| 602 && (HV_HEAD != request().verb) | |
| 603 && response().document) { | |
| 604 // Allocate on heap to not explode the stack. | |
| 605 const int array_size = 1024 * 64; | |
| 606 std::unique_ptr<char[]> buffer(new char[array_size]); | |
| 607 StreamResult result = Flow(stream.get(), buffer.get(), array_size, | |
| 608 response().document.get()); | |
| 609 if (SR_SUCCESS != result) { | |
| 610 error = HE_STREAM; | |
| 611 } | |
| 612 } | |
| 613 | |
| 614 return error; | |
| 615 } | |
| 616 | |
| 617 bool HttpClient::PrepareValidate() { | |
| 618 RTC_DCHECK(CS_READY == cache_state_); | |
| 619 // At this point, request() contains the pending request, and response() | |
| 620 // contains the cached response headers. Reformat the request to validate | |
| 621 // the cached content. | |
| 622 HttpValidatorStrength vs_required = HttpRequestValidatorLevel(request()); | |
| 623 HttpValidatorStrength vs_available = HttpResponseValidatorLevel(response()); | |
| 624 if (vs_available < vs_required) { | |
| 625 return false; | |
| 626 } | |
| 627 std::string value; | |
| 628 if (response().hasHeader(HH_ETAG, &value)) { | |
| 629 request().addHeader(HH_IF_NONE_MATCH, value); | |
| 630 } | |
| 631 if (response().hasHeader(HH_LAST_MODIFIED, &value)) { | |
| 632 request().addHeader(HH_IF_MODIFIED_SINCE, value); | |
| 633 } | |
| 634 response().clear(false); | |
| 635 cache_state_ = CS_VALIDATING; | |
| 636 return true; | |
| 637 } | |
| 638 | |
| 639 HttpError HttpClient::CompleteValidate() { | |
| 640 RTC_DCHECK(CS_VALIDATING == cache_state_); | |
| 641 | |
| 642 std::string id = GetCacheID(request()); | |
| 643 | |
| 644 // Merge cached headers with new headers | |
| 645 HttpError error = ReadCacheHeaders(id, false); | |
| 646 if (HE_NONE != error) { | |
| 647 // Rewrite merged headers to cache | |
| 648 CacheLock lock(cache_, id); | |
| 649 error = WriteCacheHeaders(id); | |
| 650 } | |
| 651 if (HE_NONE != error) { | |
| 652 error = ReadCacheBody(id); | |
| 653 } | |
| 654 return error; | |
| 655 } | |
| 656 | |
| 657 HttpError HttpClient::OnHeaderAvailable(bool ignore_data, bool chunked, | |
| 658 size_t data_size) { | |
| 659 // If we are ignoring the data, this is an intermediate header. | |
| 660 // TODO: don't signal intermediate headers. Instead, do all header-dependent | |
| 661 // processing now, and either set up the next request, or fail outright. | |
| 662 // TODO: by default, only write response documents with a success code. | |
| 663 SignalHeaderAvailable(this, !ignore_data, ignore_data ? 0 : data_size); | |
| 664 if (!ignore_data && !chunked && (data_size != SIZE_UNKNOWN) | |
| 665 && response().document) { | |
| 666 // Attempt to pre-allocate space for the downloaded data. | |
| 667 if (!response().document->ReserveSize(data_size)) { | |
| 668 return HE_OVERFLOW; | |
| 669 } | |
| 670 } | |
| 671 return HE_NONE; | |
| 672 } | |
| 673 | |
| 674 // | |
| 675 // HttpBase Implementation | |
| 676 // | |
| 677 | |
| 678 HttpError HttpClient::onHttpHeaderComplete(bool chunked, size_t& data_size) { | |
| 679 if (CS_VALIDATING == cache_state_) { | |
| 680 if (HC_NOT_MODIFIED == response().scode) { | |
| 681 return CompleteValidate(); | |
| 682 } | |
| 683 // Should we remove conditional headers from request? | |
| 684 cache_state_ = CS_READY; | |
| 685 cache_->DeleteResource(GetCacheID(request())); | |
| 686 // Continue processing response as normal | |
| 687 } | |
| 688 | |
| 689 RTC_DCHECK(!IsCacheActive()); | |
| 690 if ((request().verb == HV_HEAD) || !HttpCodeHasBody(response().scode)) { | |
| 691 // HEAD requests and certain response codes contain no body | |
| 692 data_size = 0; | |
| 693 } | |
| 694 if (ShouldRedirect(NULL) | |
| 695 || ((HC_PROXY_AUTHENTICATION_REQUIRED == response().scode) | |
| 696 && (PROXY_HTTPS == proxy_.type))) { | |
| 697 // We're going to issue another request, so ignore the incoming data. | |
| 698 base_.set_ignore_data(true); | |
| 699 } | |
| 700 | |
| 701 HttpError error = OnHeaderAvailable(base_.ignore_data(), chunked, data_size); | |
| 702 if (HE_NONE != error) { | |
| 703 return error; | |
| 704 } | |
| 705 | |
| 706 if ((NULL != cache_) | |
| 707 && !base_.ignore_data() | |
| 708 && HttpShouldCache(*transaction_)) { | |
| 709 if (BeginCacheFile()) { | |
| 710 cache_state_ = CS_WRITING; | |
| 711 } | |
| 712 } | |
| 713 return HE_NONE; | |
| 714 } | |
| 715 | |
| 716 void HttpClient::onHttpComplete(HttpMode mode, HttpError err) { | |
| 717 if (((HE_DISCONNECTED == err) || (HE_CONNECT_FAILED == err) | |
| 718 || (HE_SOCKET_ERROR == err)) | |
| 719 && (HC_INTERNAL_SERVER_ERROR == response().scode) | |
| 720 && (attempt_ < retries_)) { | |
| 721 // If the response code has not changed from the default, then we haven't | |
| 722 // received anything meaningful from the server, so we are eligible for a | |
| 723 // retry. | |
| 724 ++attempt_; | |
| 725 if (request().document && !request().document->Rewind()) { | |
| 726 // Unable to replay the request document. | |
| 727 err = HE_STREAM; | |
| 728 } else { | |
| 729 release(); | |
| 730 connect(); | |
| 731 return; | |
| 732 } | |
| 733 } else if (err != HE_NONE) { | |
| 734 // fall through | |
| 735 } else if (mode == HM_CONNECT) { | |
| 736 base_.send(&transaction_->request); | |
| 737 return; | |
| 738 } else if ((mode == HM_SEND) || HttpCodeIsInformational(response().scode)) { | |
| 739 // If you're interested in informational headers, catch | |
| 740 // SignalHeaderAvailable. | |
| 741 base_.recv(&transaction_->response); | |
| 742 return; | |
| 743 } else { | |
| 744 if (!HttpShouldKeepAlive(response())) { | |
| 745 LOG(LS_VERBOSE) << "HttpClient: closing socket"; | |
| 746 base_.stream()->Close(); | |
| 747 } | |
| 748 std::string location; | |
| 749 if (ShouldRedirect(&location)) { | |
| 750 Url<char> purl(location); | |
| 751 set_server(SocketAddress(purl.host(), purl.port())); | |
| 752 request().path = purl.full_path(); | |
| 753 if (response().scode == HC_SEE_OTHER) { | |
| 754 request().verb = HV_GET; | |
| 755 request().clearHeader(HH_CONTENT_TYPE); | |
| 756 request().clearHeader(HH_CONTENT_LENGTH); | |
| 757 request().document.reset(); | |
| 758 } else if (request().document && !request().document->Rewind()) { | |
| 759 // Unable to replay the request document. | |
| 760 RTC_DCHECK(REDIRECT_ALWAYS == redirect_action_); | |
| 761 err = HE_STREAM; | |
| 762 } | |
| 763 if (err == HE_NONE) { | |
| 764 ++redirects_; | |
| 765 context_.reset(); | |
| 766 response().clear(false); | |
| 767 release(); | |
| 768 start(); | |
| 769 return; | |
| 770 } | |
| 771 } else if ((HC_PROXY_AUTHENTICATION_REQUIRED == response().scode) | |
| 772 && (PROXY_HTTPS == proxy_.type)) { | |
| 773 std::string authorization, auth_method; | |
| 774 HttpData::const_iterator begin = response().begin(HH_PROXY_AUTHENTICATE); | |
| 775 HttpData::const_iterator end = response().end(HH_PROXY_AUTHENTICATE); | |
| 776 for (HttpData::const_iterator it = begin; it != end; ++it) { | |
| 777 HttpAuthContext *context = context_.get(); | |
| 778 HttpAuthResult res = HttpAuthenticate( | |
| 779 it->second.data(), it->second.size(), | |
| 780 proxy_.address, | |
| 781 ToString(request().verb), request().path, | |
| 782 proxy_.username, proxy_.password, | |
| 783 context, authorization, auth_method); | |
| 784 context_.reset(context); | |
| 785 if (res == HAR_RESPONSE) { | |
| 786 request().setHeader(HH_PROXY_AUTHORIZATION, authorization); | |
| 787 if (request().document && !request().document->Rewind()) { | |
| 788 err = HE_STREAM; | |
| 789 } else { | |
| 790 // Explicitly do not reset the HttpAuthContext | |
| 791 response().clear(false); | |
| 792 // TODO: Reuse socket when authenticating? | |
| 793 release(); | |
| 794 start(); | |
| 795 return; | |
| 796 } | |
| 797 } else if (res == HAR_IGNORE) { | |
| 798 LOG(INFO) << "Ignoring Proxy-Authenticate: " << auth_method; | |
| 799 continue; | |
| 800 } else { | |
| 801 break; | |
| 802 } | |
| 803 } | |
| 804 } | |
| 805 } | |
| 806 if (CS_WRITING == cache_state_) { | |
| 807 CompleteCacheFile(); | |
| 808 cache_state_ = CS_READY; | |
| 809 } else if (CS_READING == cache_state_) { | |
| 810 cache_state_ = CS_READY; | |
| 811 } | |
| 812 release(); | |
| 813 SignalHttpClientComplete(this, err); | |
| 814 } | |
| 815 | |
| 816 void HttpClient::onHttpClosed(HttpError err) { | |
| 817 // This shouldn't occur, since we return the stream to the pool upon command | |
| 818 // completion. | |
| 819 RTC_NOTREACHED(); | |
| 820 } | |
| 821 | |
| 822 ////////////////////////////////////////////////////////////////////// | |
| 823 // HttpClientDefault | |
| 824 ////////////////////////////////////////////////////////////////////// | |
| 825 | |
| 826 HttpClientDefault::HttpClientDefault(SocketFactory* factory, | |
| 827 const std::string& agent, | |
| 828 HttpTransaction* transaction) | |
| 829 : ReuseSocketPool(factory ? factory : Thread::Current()->socketserver()), | |
| 830 HttpClient(agent, NULL, transaction) { | |
| 831 set_pool(this); | |
| 832 } | |
| 833 | |
| 834 ////////////////////////////////////////////////////////////////////// | |
| 835 | |
| 836 } // namespace rtc | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 2694753002:
Delete httpclient.c and related files. (Closed)
