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