src/content/browser/loader/resource_dispatcher_host_impl.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 // See http://dev.chromium.org/developers/design-documents/multi-process-resource-loading
   6
   7 #include "content/browser/loader/resource_dispatcher_host_impl.h"
   8
   9 #include <algorithm>
  10 #include <set>
  11 #include <vector>
  12
  13 #include "base/bind.h"
  14 #include "base/bind_helpers.h"
  15 #include "base/command_line.h"
  16 #include "base/compiler_specific.h"
  17 #include "base/debug/alias.h"
  18 #include "base/logging.h"
  19 #include "base/memory/scoped_ptr.h"
  20 #include "base/memory/shared_memory.h"
  21 #include "base/message_loop/message_loop.h"
  22 #include "base/metrics/histogram.h"
  23 #include "base/metrics/sparse_histogram.h"
  24 #include "base/stl_util.h"
  25 #include "base/third_party/dynamic_annotations/dynamic_annotations.h"
  26 #include "content/browser/appcache/appcache_interceptor.h"
  27 #include "content/browser/appcache/chrome_appcache_service.h"
  28 #include "content/browser/cert_store_impl.h"
  29 #include "content/browser/child_process_security_policy_impl.h"
  30 #include "content/browser/cross_site_request_manager.h"
  31 #include "content/browser/download/download_resource_handler.h"
  32 #include "content/browser/download/save_file_manager.h"
  33 #include "content/browser/download/save_file_resource_handler.h"
  34 #include "content/browser/fileapi/chrome_blob_storage_context.h"
  35 #include "content/browser/loader/async_resource_handler.h"
  36 #include "content/browser/loader/buffered_resource_handler.h"
  37 #include "content/browser/loader/cross_site_resource_handler.h"
  38 #include "content/browser/loader/detachable_resource_handler.h"
  39 #include "content/browser/loader/power_save_block_resource_throttle.h"
  40 #include "content/browser/loader/redirect_to_file_resource_handler.h"
  41 #include "content/browser/loader/resource_message_filter.h"
  42 #include "content/browser/loader/resource_request_info_impl.h"
  43 #include "content/browser/loader/stream_resource_handler.h"
  44 #include "content/browser/loader/sync_resource_handler.h"
  45 #include "content/browser/loader/throttling_resource_handler.h"
  46 #include "content/browser/loader/upload_data_stream_builder.h"
  47 #include "content/browser/plugin_service_impl.h"
  48 #include "content/browser/renderer_host/render_view_host_delegate.h"
  49 #include "content/browser/renderer_host/render_view_host_impl.h"
  50 #include "content/browser/resource_context_impl.h"
  51 #include "content/browser/service_worker/service_worker_request_handler.h"
  52 #include "content/browser/streams/stream.h"
  53 #include "content/browser/streams/stream_context.h"
  54 #include "content/browser/streams/stream_registry.h"
  55 #include "content/browser/worker_host/worker_service_impl.h"
  56 #include "content/browser/web_contents/web_contents_impl.h"
  57 #include "content/common/resource_messages.h"
  58 #include "content/common/resource_request_body.h"
  59 #include "content/common/ssl_status_serialization.h"
  60 #include "content/common/view_messages.h"
  61 #include "content/public/browser/browser_thread.h"
  62 #include "content/public/browser/content_browser_client.h"
  63 #include "content/public/browser/download_manager.h"
  64 #include "content/public/browser/download_url_parameters.h"
  65 #include "content/public/browser/global_request_id.h"
  66 #include "content/public/browser/resource_dispatcher_host_delegate.h"
  67 #include "content/public/browser/resource_request_details.h"
  68 #include "content/public/browser/resource_throttle.h"
  69 #include "content/public/browser/stream_handle.h"
  70 #include "content/public/browser/user_metrics.h"
  71 #include "content/public/common/content_switches.h"
  72 #include "content/public/common/process_type.h"
  73 #include "content/public/common/url_constants.h"
  74 #include "ipc/ipc_message_macros.h"
  75 #include "ipc/ipc_message_start.h"
  76 #include "net/base/auth.h"
  77 #include "net/base/load_flags.h"
  78 #include "net/base/mime_util.h"
  79 #include "net/base/net_errors.h"
  80 #include "net/base/registry_controlled_domains/registry_controlled_domain.h"
  81 #include "net/base/request_priority.h"
  82 #include "net/base/upload_data_stream.h"
  83 #include "net/cert/cert_status_flags.h"
  84 #include "net/cookies/cookie_monster.h"
  85 #include "net/http/http_response_headers.h"
  86 #include "net/http/http_response_info.h"
  87 #include "net/ssl/ssl_cert_request_info.h"
  88 #include "net/url_request/url_request.h"
  89 #include "net/url_request/url_request_context.h"
  90 #include "net/url_request/url_request_job_factory.h"
  91 #include "webkit/common/blob/blob_data.h"
  92 #include "webkit/browser/blob/blob_data_handle.h"
  93 #include "webkit/browser/blob/blob_storage_context.h"
  94 #include "webkit/browser/blob/blob_url_request_job_factory.h"
  95 #include "webkit/browser/fileapi/file_permission_policy.h"
  96 #include "webkit/browser/fileapi/file_system_context.h"
  97 #include "webkit/common/appcache/appcache_interfaces.h"
  98 #include "webkit/common/blob/shareable_file_reference.h"
  99
 100 using base::Time;
 101 using base::TimeDelta;
 102 using base::TimeTicks;
 103 using webkit_blob::ShareableFileReference;
 104
 105 // ----------------------------------------------------------------------------
 106
 107 namespace content {
 108
 109 namespace {
 110
 111 static ResourceDispatcherHostImpl* g_resource_dispatcher_host;
 112
 113 // The interval for calls to ResourceDispatcherHostImpl::UpdateLoadStates
 114 const int kUpdateLoadStatesIntervalMsec = 100;
 115
 116 // Maximum byte "cost" of all the outstanding requests for a renderer.
 117 // See delcaration of |max_outstanding_requests_cost_per_process_| for details.
 118 // This bound is 25MB, which allows for around 6000 outstanding requests.
 119 const int kMaxOutstandingRequestsCostPerProcess = 26214400;
 120
 121 // The number of milliseconds after noting a user gesture that we will
 122 // tag newly-created URLRequest objects with the
 123 // net::LOAD_MAYBE_USER_GESTURE load flag. This is a fairly arbitrary
 124 // guess at how long to expect direct impact from a user gesture, but
 125 // this should be OK as the load flag is a best-effort thing only,
 126 // rather than being intended as fully accurate.
 127 const int kUserGestureWindowMs = 3500;
 128
 129 // Ratio of |max_num_in_flight_requests_| that any one renderer is allowed to
 130 // use. Arbitrarily chosen.
 131 const double kMaxRequestsPerProcessRatio = 0.45;
 132
 133 // TODO(jkarlin): The value is high to reduce the chance of the detachable
 134 // request timing out, forcing a blocked second request to open a new connection
 135 // and start over. Reduce this value once we have a better idea of what it
 136 // should be and once we stop blocking multiple simultaneous requests for the
 137 // same resource (see bugs 46104 and 31014).
 138 const int kDefaultDetachableCancelDelayMs = 30000;
 139
 140 bool IsDetachableResourceType(ResourceType::Type type) {
 141   switch (type) {
 142     case ResourceType::PREFETCH:
 143     case ResourceType::PING:
 144       return true;
 145     default:
 146       return false;
 147   }
 148 }
 149
 150 // Aborts a request before an URLRequest has actually been created.
 151 void AbortRequestBeforeItStarts(ResourceMessageFilter* filter,
 152                                 IPC::Message* sync_result,
 153                                 int request_id) {
 154   if (sync_result) {
 155     SyncLoadResult result;
 156     result.error_code = net::ERR_ABORTED;
 157     ResourceHostMsg_SyncLoad::WriteReplyParams(sync_result, result);
 158     filter->Send(sync_result);
 159   } else {
 160     // Tell the renderer that this request was disallowed.
 161     ResourceMsg_RequestCompleteData request_complete_data;
 162     request_complete_data.error_code = net::ERR_ABORTED;
 163     request_complete_data.was_ignored_by_handler = false;
 164     request_complete_data.exists_in_cache = false;
 165     // No security info needed, connection not established.
 166     request_complete_data.completion_time = base::TimeTicks();
 167     request_complete_data.encoded_data_length = 0;
 168     filter->Send(new ResourceMsg_RequestComplete(
 169         request_id, request_complete_data));
 170   }
 171 }
 172
 173 void SetReferrerForRequest(net::URLRequest* request, const Referrer& referrer) {
 174   if (!referrer.url.is_valid() ||
 175       CommandLine::ForCurrentProcess()->HasSwitch(switches::kNoReferrers)) {
 176     request->SetReferrer(std::string());
 177   } else {
 178     request->SetReferrer(referrer.url.spec());
 179   }
 180
 181   net::URLRequest::ReferrerPolicy net_referrer_policy =
 182       net::URLRequest::CLEAR_REFERRER_ON_TRANSITION_FROM_SECURE_TO_INSECURE;
 183   switch (referrer.policy) {
 184     case blink::WebReferrerPolicyDefault:
 185       net_referrer_policy =
 186           net::URLRequest::CLEAR_REFERRER_ON_TRANSITION_FROM_SECURE_TO_INSECURE;
 187       break;
 188     case blink::WebReferrerPolicyAlways:
 189     case blink::WebReferrerPolicyNever:
 190     case blink::WebReferrerPolicyOrigin:
 191       net_referrer_policy = net::URLRequest::NEVER_CLEAR_REFERRER;
 192       break;
 193   }
 194   request->set_referrer_policy(net_referrer_policy);
 195 }
 196
 197 // Consults the RendererSecurity policy to determine whether the
 198 // ResourceDispatcherHostImpl should service this request.  A request might be
 199 // disallowed if the renderer is not authorized to retrieve the request URL or
 200 // if the renderer is attempting to upload an unauthorized file.
 201 bool ShouldServiceRequest(int process_type,
 202                           int child_id,
 203                           const ResourceHostMsg_Request& request_data,
 204                           fileapi::FileSystemContext* file_system_context)  {
 205   if (process_type == PROCESS_TYPE_PLUGIN)
 206     return true;
 207
 208   ChildProcessSecurityPolicyImpl* policy =
 209       ChildProcessSecurityPolicyImpl::GetInstance();
 210
 211   // Check if the renderer is permitted to request the requested URL.
 212   if (!policy->CanRequestURL(child_id, request_data.url)) {
 213     VLOG(1) << "Denied unauthorized request for "
 214             << request_data.url.possibly_invalid_spec();
 215     return false;
 216   }
 217
 218   // Check if the renderer is permitted to upload the requested files.
 219   if (request_data.request_body.get()) {
 220     const std::vector<ResourceRequestBody::Element>* uploads =
 221         request_data.request_body->elements();
 222     std::vector<ResourceRequestBody::Element>::const_iterator iter;
 223     for (iter = uploads->begin(); iter != uploads->end(); ++iter) {
 224       if (iter->type() == ResourceRequestBody::Element::TYPE_FILE &&
 225           !policy->CanReadFile(child_id, iter->path())) {
 226         NOTREACHED() << "Denied unauthorized upload of "
 227                      << iter->path().value();
 228         return false;
 229       }
 230       if (iter->type() == ResourceRequestBody::Element::TYPE_FILE_FILESYSTEM) {
 231         fileapi::FileSystemURL url =
 232             file_system_context->CrackURL(iter->filesystem_url());
 233         if (!policy->CanReadFileSystemFile(child_id, url)) {
 234           NOTREACHED() << "Denied unauthorized upload of "
 235                        << iter->filesystem_url().spec();
 236           return false;
 237         }
 238       }
 239     }
 240   }
 241
 242   return true;
 243 }
 244
 245 void RemoveDownloadFileFromChildSecurityPolicy(int child_id,
 246                                                const base::FilePath& path) {
 247   ChildProcessSecurityPolicyImpl::GetInstance()->RevokeAllPermissionsForFile(
 248       child_id, path);
 249 }
 250
 251 #if defined(OS_WIN)
 252 #pragma warning(disable: 4748)
 253 #pragma optimize("", off)
 254 #endif
 255
 256 #if defined(OS_WIN)
 257 #pragma optimize("", on)
 258 #pragma warning(default: 4748)
 259 #endif
 260
 261 DownloadInterruptReason CallbackAndReturn(
 262     const DownloadUrlParameters::OnStartedCallback& started_cb,
 263     DownloadInterruptReason interrupt_reason) {
 264   if (started_cb.is_null())
 265     return interrupt_reason;
 266   BrowserThread::PostTask(
 267       BrowserThread::UI,
 268       FROM_HERE,
 269       base::Bind(
 270           started_cb, static_cast<DownloadItem*>(NULL), interrupt_reason));
 271
 272   return interrupt_reason;
 273 }
 274
 275 int GetCertID(net::URLRequest* request, int child_id) {
 276   if (request->ssl_info().cert.get()) {
 277     return CertStore::GetInstance()->StoreCert(request->ssl_info().cert.get(),
 278                                                child_id);
 279   }
 280   return 0;
 281 }
 282
 283 void NotifyRedirectOnUI(int render_process_id,
 284                         int render_frame_host,
 285                         scoped_ptr<ResourceRedirectDetails> details) {
 286   RenderFrameHostImpl* host =
 287       RenderFrameHostImpl::FromID(render_process_id, render_frame_host);
 288   WebContentsImpl* web_contents =
 289       static_cast<WebContentsImpl*>(WebContents::FromRenderFrameHost(host));
 290   if (!web_contents)
 291     return;
 292   web_contents->DidGetRedirectForResourceRequest(
 293       host->render_view_host(), *details.get());
 294 }
 295
 296 void NotifyResponseOnUI(int render_process_id,
 297                         int render_frame_host,
 298                         scoped_ptr<ResourceRequestDetails> details) {
 299   RenderFrameHostImpl* host =
 300       RenderFrameHostImpl::FromID(render_process_id, render_frame_host);
 301   WebContentsImpl* web_contents =
 302       static_cast<WebContentsImpl*>(WebContents::FromRenderFrameHost(host));
 303   if (!web_contents)
 304     return;
 305   web_contents->DidGetResourceResponseStart(*details.get());
 306 }
 307
 308 bool IsValidatedSCT(
 309     const net::SignedCertificateTimestampAndStatus& sct_status) {
 310   return sct_status.status == net::ct::SCT_STATUS_OK;
 311 }
 312
 313 }  // namespace
 314
 315 // static
 316 ResourceDispatcherHost* ResourceDispatcherHost::Get() {
 317   return g_resource_dispatcher_host;
 318 }
 319
 320 ResourceDispatcherHostImpl::ResourceDispatcherHostImpl()
 321     : save_file_manager_(new SaveFileManager()),
 322       request_id_(-1),
 323       is_shutdown_(false),
 324       num_in_flight_requests_(0),
 325       max_num_in_flight_requests_(base::SharedMemory::GetHandleLimit()),
 326       max_num_in_flight_requests_per_process_(
 327           static_cast<int>(
 328               max_num_in_flight_requests_ * kMaxRequestsPerProcessRatio)),
 329       max_outstanding_requests_cost_per_process_(
 330           kMaxOutstandingRequestsCostPerProcess),
 331       filter_(NULL),
 332       delegate_(NULL),
 333       allow_cross_origin_auth_prompt_(false) {
 334   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 335   DCHECK(!g_resource_dispatcher_host);
 336   g_resource_dispatcher_host = this;
 337
 338   GetContentClient()->browser()->ResourceDispatcherHostCreated();
 339
 340   ANNOTATE_BENIGN_RACE(
 341       &last_user_gesture_time_,
 342       "We don't care about the precise value, see http://crbug.com/92889");
 343
 344   BrowserThread::PostTask(BrowserThread::IO,
 345                           FROM_HERE,
 346                           base::Bind(&ResourceDispatcherHostImpl::OnInit,
 347                                      base::Unretained(this)));
 348
 349   update_load_states_timer_.reset(
 350       new base::RepeatingTimer<ResourceDispatcherHostImpl>());
 351 }
 352
 353 ResourceDispatcherHostImpl::~ResourceDispatcherHostImpl() {
 354   DCHECK(outstanding_requests_stats_map_.empty());
 355   DCHECK(g_resource_dispatcher_host);
 356   g_resource_dispatcher_host = NULL;
 357 }
 358
 359 // static
 360 ResourceDispatcherHostImpl* ResourceDispatcherHostImpl::Get() {
 361   return g_resource_dispatcher_host;
 362 }
 363
 364 void ResourceDispatcherHostImpl::SetDelegate(
 365     ResourceDispatcherHostDelegate* delegate) {
 366   delegate_ = delegate;
 367 }
 368
 369 void ResourceDispatcherHostImpl::SetAllowCrossOriginAuthPrompt(bool value) {
 370   allow_cross_origin_auth_prompt_ = value;
 371 }
 372
 373 void ResourceDispatcherHostImpl::AddResourceContext(ResourceContext* context) {
 374   active_resource_contexts_.insert(context);
 375 }
 376
 377 void ResourceDispatcherHostImpl::RemoveResourceContext(
 378     ResourceContext* context) {
 379   CHECK(ContainsKey(active_resource_contexts_, context));
 380   active_resource_contexts_.erase(context);
 381 }
 382
 383 void ResourceDispatcherHostImpl::CancelRequestsForContext(
 384     ResourceContext* context) {
 385   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 386   DCHECK(context);
 387
 388   CHECK(ContainsKey(active_resource_contexts_, context));
 389
 390   // Note that request cancellation has side effects. Therefore, we gather all
 391   // the requests to cancel first, and then we start cancelling. We assert at
 392   // the end that there are no more to cancel since the context is about to go
 393   // away.
 394   typedef std::vector<linked_ptr<ResourceLoader> > LoaderList;
 395   LoaderList loaders_to_cancel;
 396
 397   for (LoaderMap::iterator i = pending_loaders_.begin();
 398        i != pending_loaders_.end();) {
 399     if (i->second->GetRequestInfo()->GetContext() == context) {
 400       loaders_to_cancel.push_back(i->second);
 401       IncrementOutstandingRequestsMemory(-1, *i->second->GetRequestInfo());
 402       pending_loaders_.erase(i++);
 403     } else {
 404       ++i;
 405     }
 406   }
 407
 408   for (BlockedLoadersMap::iterator i = blocked_loaders_map_.begin();
 409        i != blocked_loaders_map_.end();) {
 410     BlockedLoadersList* loaders = i->second;
 411     if (loaders->empty()) {
 412       // This can happen if BlockRequestsForRoute() has been called for a route,
 413       // but we haven't blocked any matching requests yet.
 414       ++i;
 415       continue;
 416     }
 417     ResourceRequestInfoImpl* info = loaders->front()->GetRequestInfo();
 418     if (info->GetContext() == context) {
 419       blocked_loaders_map_.erase(i++);
 420       for (BlockedLoadersList::const_iterator it = loaders->begin();
 421            it != loaders->end(); ++it) {
 422         linked_ptr<ResourceLoader> loader = *it;
 423         info = loader->GetRequestInfo();
 424         // We make the assumption that all requests on the list have the same
 425         // ResourceContext.
 426         DCHECK_EQ(context, info->GetContext());
 427         IncrementOutstandingRequestsMemory(-1, *info);
 428         loaders_to_cancel.push_back(loader);
 429       }
 430       delete loaders;
 431     } else {
 432       ++i;
 433     }
 434   }
 435
 436 #ifndef NDEBUG
 437   for (LoaderList::iterator i = loaders_to_cancel.begin();
 438        i != loaders_to_cancel.end(); ++i) {
 439     // There is no strict requirement that this be the case, but currently
 440     // downloads, streams, detachable requests, and transferred requests are the
 441     // only requests that aren't cancelled when the associated processes go
 442     // away. It may be OK for this invariant to change in the future, but if
 443     // this assertion fires without the invariant changing, then it's indicative
 444     // of a leak.
 445     DCHECK((*i)->GetRequestInfo()->IsDownload() ||
 446            (*i)->GetRequestInfo()->is_stream() ||
 447            ((*i)->GetRequestInfo()->detachable_handler() &&
 448             (*i)->GetRequestInfo()->detachable_handler()->is_detached()) ||
 449            (*i)->is_transferring());
 450   }
 451 #endif
 452
 453   loaders_to_cancel.clear();
 454
 455   // Validate that no more requests for this context were added.
 456   for (LoaderMap::const_iterator i = pending_loaders_.begin();
 457        i != pending_loaders_.end(); ++i) {
 458     // http://crbug.com/90971
 459     CHECK_NE(i->second->GetRequestInfo()->GetContext(), context);
 460   }
 461
 462   for (BlockedLoadersMap::const_iterator i = blocked_loaders_map_.begin();
 463        i != blocked_loaders_map_.end(); ++i) {
 464     BlockedLoadersList* loaders = i->second;
 465     if (!loaders->empty()) {
 466       ResourceRequestInfoImpl* info = loaders->front()->GetRequestInfo();
 467       // http://crbug.com/90971
 468       CHECK_NE(info->GetContext(), context);
 469     }
 470   }
 471 }
 472
 473 DownloadInterruptReason ResourceDispatcherHostImpl::BeginDownload(
 474     scoped_ptr<net::URLRequest> request,
 475     const Referrer& referrer,
 476     bool is_content_initiated,
 477     ResourceContext* context,
 478     int child_id,
 479     int route_id,
 480     bool prefer_cache,
 481     scoped_ptr<DownloadSaveInfo> save_info,
 482     uint32 download_id,
 483     const DownloadStartedCallback& started_callback) {
 484   if (is_shutdown_)
 485     return CallbackAndReturn(started_callback,
 486                              DOWNLOAD_INTERRUPT_REASON_USER_SHUTDOWN);
 487
 488   const GURL& url = request->original_url();
 489
 490   // http://crbug.com/90971
 491   char url_buf[128];
 492   base::strlcpy(url_buf, url.spec().c_str(), arraysize(url_buf));
 493   base::debug::Alias(url_buf);
 494   CHECK(ContainsKey(active_resource_contexts_, context));
 495
 496   SetReferrerForRequest(request.get(), referrer);
 497
 498   int extra_load_flags = net::LOAD_IS_DOWNLOAD;
 499   if (prefer_cache) {
 500     // If there is upload data attached, only retrieve from cache because there
 501     // is no current mechanism to prompt the user for their consent for a
 502     // re-post. For GETs, try to retrieve data from the cache and skip
 503     // validating the entry if present.
 504     if (request->get_upload() != NULL)
 505       extra_load_flags |= net::LOAD_ONLY_FROM_CACHE;
 506     else
 507       extra_load_flags |= net::LOAD_PREFERRING_CACHE;
 508   } else {
 509     extra_load_flags |= net::LOAD_DISABLE_CACHE;
 510   }
 511   request->SetLoadFlags(request->load_flags() | extra_load_flags);
 512
 513   // No need to get offline load flags for downloads, but make sure
 514   // we have an OfflinePolicy to receive request completions.
 515   GlobalRoutingID id(child_id, route_id);
 516   if (!offline_policy_map_[id])
 517     offline_policy_map_[id] = new OfflinePolicy();
 518
 519   // Check if the renderer is permitted to request the requested URL.
 520   if (!ChildProcessSecurityPolicyImpl::GetInstance()->
 521           CanRequestURL(child_id, url)) {
 522     VLOG(1) << "Denied unauthorized download request for "
 523             << url.possibly_invalid_spec();
 524     return CallbackAndReturn(started_callback,
 525                              DOWNLOAD_INTERRUPT_REASON_NETWORK_INVALID_REQUEST);
 526   }
 527
 528   request_id_--;
 529
 530   const net::URLRequestContext* request_context = context->GetRequestContext();
 531   if (!request_context->job_factory()->IsHandledURL(url)) {
 532     VLOG(1) << "Download request for unsupported protocol: "
 533             << url.possibly_invalid_spec();
 534     return CallbackAndReturn(started_callback,
 535                              DOWNLOAD_INTERRUPT_REASON_NETWORK_INVALID_REQUEST);
 536   }
 537
 538   ResourceRequestInfoImpl* extra_info =
 539       CreateRequestInfo(child_id, route_id, true, context);
 540   extra_info->AssociateWithRequest(request.get());  // Request takes ownership.
 541
 542   if (request->url().SchemeIs(kBlobScheme)) {
 543     ChromeBlobStorageContext* blob_context =
 544         GetChromeBlobStorageContextForResourceContext(context);
 545     webkit_blob::BlobProtocolHandler::SetRequestedBlobDataHandle(
 546         request.get(),
 547         blob_context->context()->GetBlobDataFromPublicURL(request->url()));
 548   }
 549
 550   // From this point forward, the |DownloadResourceHandler| is responsible for
 551   // |started_callback|.
 552   scoped_ptr<ResourceHandler> handler(
 553       CreateResourceHandlerForDownload(request.get(), is_content_initiated,
 554                                        true, download_id, save_info.Pass(),
 555                                        started_callback));
 556
 557   BeginRequestInternal(request.Pass(), handler.Pass());
 558
 559   return DOWNLOAD_INTERRUPT_REASON_NONE;
 560 }
 561
 562 void ResourceDispatcherHostImpl::ClearLoginDelegateForRequest(
 563     net::URLRequest* request) {
 564   ResourceRequestInfoImpl* info = ResourceRequestInfoImpl::ForRequest(request);
 565   if (info) {
 566     ResourceLoader* loader = GetLoader(info->GetGlobalRequestID());
 567     if (loader)
 568       loader->ClearLoginDelegate();
 569   }
 570 }
 571
 572 void ResourceDispatcherHostImpl::Shutdown() {
 573   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 574   BrowserThread::PostTask(BrowserThread::IO,
 575                           FROM_HERE,
 576                           base::Bind(&ResourceDispatcherHostImpl::OnShutdown,
 577                                      base::Unretained(this)));
 578 }
 579
 580 scoped_ptr<ResourceHandler>
 581 ResourceDispatcherHostImpl::CreateResourceHandlerForDownload(
 582     net::URLRequest* request,
 583     bool is_content_initiated,
 584     bool must_download,
 585     uint32 id,
 586     scoped_ptr<DownloadSaveInfo> save_info,
 587     const DownloadUrlParameters::OnStartedCallback& started_cb) {
 588   scoped_ptr<ResourceHandler> handler(
 589       new DownloadResourceHandler(id, request, started_cb, save_info.Pass()));
 590   if (delegate_) {
 591     const ResourceRequestInfo* request_info(
 592         ResourceRequestInfo::ForRequest(request));
 593
 594     ScopedVector<ResourceThrottle> throttles;
 595     delegate_->DownloadStarting(
 596         request, request_info->GetContext(), request_info->GetChildID(),
 597         request_info->GetRouteID(), request_info->GetRequestID(),
 598         is_content_initiated, must_download, &throttles);
 599     if (!throttles.empty()) {
 600       handler.reset(
 601           new ThrottlingResourceHandler(
 602               handler.Pass(), request, throttles.Pass()));
 603     }
 604   }
 605   return handler.Pass();
 606 }
 607
 608 scoped_ptr<ResourceHandler>
 609 ResourceDispatcherHostImpl::MaybeInterceptAsStream(net::URLRequest* request,
 610                                                    ResourceResponse* response) {
 611   ResourceRequestInfoImpl* info = ResourceRequestInfoImpl::ForRequest(request);
 612   const std::string& mime_type = response->head.mime_type;
 613
 614   GURL origin;
 615   std::string target_id;
 616   if (!delegate_ ||
 617       !delegate_->ShouldInterceptResourceAsStream(info->GetContext(),
 618                                                   request->url(),
 619                                                   mime_type,
 620                                                   &origin,
 621                                                   &target_id)) {
 622     return scoped_ptr<ResourceHandler>();
 623   }
 624
 625   StreamContext* stream_context =
 626       GetStreamContextForResourceContext(info->GetContext());
 627
 628   scoped_ptr<StreamResourceHandler> handler(
 629       new StreamResourceHandler(request,
 630                                 stream_context->registry(),
 631                                 origin));
 632
 633   info->set_is_stream(true);
 634   delegate_->OnStreamCreated(
 635       info->GetContext(),
 636       info->GetChildID(),
 637       info->GetRouteID(),
 638       target_id,
 639       handler->stream()->CreateHandle(
 640           request->url(),
 641           mime_type,
 642           response->head.headers),
 643       request->GetExpectedContentSize());
 644   return handler.PassAs<ResourceHandler>();
 645 }
 646
 647 void ResourceDispatcherHostImpl::ClearSSLClientAuthHandlerForRequest(
 648     net::URLRequest* request) {
 649   ResourceRequestInfoImpl* info = ResourceRequestInfoImpl::ForRequest(request);
 650   if (info) {
 651     ResourceLoader* loader = GetLoader(info->GetGlobalRequestID());
 652     if (loader)
 653       loader->ClearSSLClientAuthHandler();
 654   }
 655 }
 656
 657 ResourceDispatcherHostLoginDelegate*
 658 ResourceDispatcherHostImpl::CreateLoginDelegate(
 659     ResourceLoader* loader,
 660     net::AuthChallengeInfo* auth_info) {
 661   if (!delegate_)
 662     return NULL;
 663
 664   return delegate_->CreateLoginDelegate(auth_info, loader->request());
 665 }
 666
 667 bool ResourceDispatcherHostImpl::HandleExternalProtocol(ResourceLoader* loader,
 668                                                         const GURL& url) {
 669   if (!delegate_)
 670     return false;
 671
 672   ResourceRequestInfoImpl* info = loader->GetRequestInfo();
 673
 674   if (!ResourceType::IsFrame(info->GetResourceType()))
 675     return false;
 676
 677   const net::URLRequestJobFactory* job_factory =
 678       info->GetContext()->GetRequestContext()->job_factory();
 679   if (job_factory->IsHandledURL(url))
 680     return false;
 681
 682   bool initiated_by_user_gesture =
 683       (loader->request()->load_flags() & net::LOAD_MAYBE_USER_GESTURE) != 0;
 684   bool handled = delegate_->HandleExternalProtocol(url, info->GetChildID(),
 685                                                    info->GetRouteID(),
 686                                                    initiated_by_user_gesture);
 687   // Consume the user gesture if the external protocol dialog is shown.
 688   if (handled)
 689     last_user_gesture_time_ = base::TimeTicks();
 690   return handled;
 691 }
 692
 693 void ResourceDispatcherHostImpl::DidStartRequest(ResourceLoader* loader) {
 694   // Make sure we have the load state monitor running
 695   if (!update_load_states_timer_->IsRunning()) {
 696     update_load_states_timer_->Start(FROM_HERE,
 697         TimeDelta::FromMilliseconds(kUpdateLoadStatesIntervalMsec),
 698         this, &ResourceDispatcherHostImpl::UpdateLoadStates);
 699   }
 700 }
 701
 702 void ResourceDispatcherHostImpl::DidReceiveRedirect(ResourceLoader* loader,
 703                                                     const GURL& new_url) {
 704   ResourceRequestInfoImpl* info = loader->GetRequestInfo();
 705
 706   int render_process_id, render_frame_host;
 707   if (!info->GetAssociatedRenderFrame(&render_process_id, &render_frame_host))
 708     return;
 709
 710   // Notify the observers on the UI thread.
 711   scoped_ptr<ResourceRedirectDetails> detail(new ResourceRedirectDetails(
 712       loader->request(),
 713       GetCertID(loader->request(), info->GetChildID()),
 714       new_url));
 715   BrowserThread::PostTask(
 716       BrowserThread::UI, FROM_HERE,
 717       base::Bind(
 718           &NotifyRedirectOnUI,
 719           render_process_id, render_frame_host, base::Passed(&detail)));
 720 }
 721
 722 void ResourceDispatcherHostImpl::DidReceiveResponse(ResourceLoader* loader) {
 723   ResourceRequestInfoImpl* info = loader->GetRequestInfo();
 724
 725   if (loader->request()->was_fetched_via_proxy() &&
 726       loader->request()->was_fetched_via_spdy() &&
 727       loader->request()->url().SchemeIs("http")) {
 728     scheduler_->OnReceivedSpdyProxiedHttpResponse(
 729         info->GetChildID(), info->GetRouteID());
 730   }
 731
 732   // There should be an entry in the map created when we dispatched the
 733   // request unless it's been detached and the renderer has died.
 734   OfflineMap::iterator policy_it(
 735       offline_policy_map_.find(info->GetGlobalRoutingID()));
 736   if (offline_policy_map_.end() != policy_it) {
 737     policy_it->second->UpdateStateForSuccessfullyStartedRequest(
 738         loader->request()->response_info());
 739   } else {
 740     // Unless detached, we should have an entry in offline_policy_map_ from
 741     // when this request traversed Begin{Download,SaveFile,Request}.
 742     // TODO(rdsmith): This isn't currently true; see http://crbug.com/241176.
 743     DCHECK(info->detachable_handler() &&
 744            info->detachable_handler()->is_detached());
 745   }
 746
 747   int render_process_id, render_frame_host;
 748   if (!info->GetAssociatedRenderFrame(&render_process_id, &render_frame_host))
 749     return;
 750
 751   // Notify the observers on the UI thread.
 752   scoped_ptr<ResourceRequestDetails> detail(new ResourceRequestDetails(
 753       loader->request(),
 754       GetCertID(loader->request(), info->GetChildID())));
 755   BrowserThread::PostTask(
 756       BrowserThread::UI, FROM_HERE,
 757       base::Bind(
 758           &NotifyResponseOnUI,
 759           render_process_id, render_frame_host, base::Passed(&detail)));
 760 }
 761
 762 void ResourceDispatcherHostImpl::DidFinishLoading(ResourceLoader* loader) {
 763   ResourceRequestInfo* info = loader->GetRequestInfo();
 764
 765   // Record final result of all resource loads.
 766   if (info->GetResourceType() == ResourceType::MAIN_FRAME) {
 767     // This enumeration has "3" appended to its name to distinguish it from
 768     // older versions.
 769     UMA_HISTOGRAM_SPARSE_SLOWLY(
 770         "Net.ErrorCodesForMainFrame3",
 771         -loader->request()->status().error());
 772
 773     if (loader->request()->url().SchemeIsSecure()) {
 774       if (loader->request()->url().host() == "www.google.com") {
 775         UMA_HISTOGRAM_SPARSE_SLOWLY("Net.ErrorCodesForHTTPSGoogleMainFrame2",
 776                                     -loader->request()->status().error());
 777       }
 778
 779       int num_valid_scts = std::count_if(
 780           loader->request()->ssl_info().signed_certificate_timestamps.begin(),
 781           loader->request()->ssl_info().signed_certificate_timestamps.end(),
 782           IsValidatedSCT);
 783       UMA_HISTOGRAM_COUNTS_100(
 784           "Net.CertificateTransparency.MainFrameValidSCTCount", num_valid_scts);
 785     }
 786   } else {
 787     if (info->GetResourceType() == ResourceType::IMAGE) {
 788       UMA_HISTOGRAM_SPARSE_SLOWLY(
 789           "Net.ErrorCodesForImages",
 790           -loader->request()->status().error());
 791     }
 792     // This enumeration has "2" appended to distinguish it from older versions.
 793     UMA_HISTOGRAM_SPARSE_SLOWLY(
 794         "Net.ErrorCodesForSubresources2",
 795         -loader->request()->status().error());
 796   }
 797
 798   if (delegate_)
 799     delegate_->RequestComplete(loader->request());
 800
 801   // Destroy the ResourceLoader.
 802   RemovePendingRequest(info->GetChildID(), info->GetRequestID());
 803 }
 804
 805 void ResourceDispatcherHostImpl::OnInit() {
 806   scheduler_.reset(new ResourceScheduler);
 807   AppCacheInterceptor::EnsureRegistered();
 808 }
 809
 810 void ResourceDispatcherHostImpl::OnShutdown() {
 811   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 812
 813   is_shutdown_ = true;
 814   pending_loaders_.clear();
 815
 816   // Make sure we shutdown the timer now, otherwise by the time our destructor
 817   // runs if the timer is still running the Task is deleted twice (once by
 818   // the MessageLoop and the second time by RepeatingTimer).
 819   update_load_states_timer_.reset();
 820
 821   // Clear blocked requests if any left.
 822   // Note that we have to do this in 2 passes as we cannot call
 823   // CancelBlockedRequestsForRoute while iterating over
 824   // blocked_loaders_map_, as it modifies it.
 825   std::set<GlobalRoutingID> ids;
 826   for (BlockedLoadersMap::const_iterator iter = blocked_loaders_map_.begin();
 827        iter != blocked_loaders_map_.end(); ++iter) {
 828     std::pair<std::set<GlobalRoutingID>::iterator, bool> result =
 829         ids.insert(iter->first);
 830     // We should not have duplicates.
 831     DCHECK(result.second);
 832   }
 833   for (std::set<GlobalRoutingID>::const_iterator iter = ids.begin();
 834        iter != ids.end(); ++iter) {
 835     CancelBlockedRequestsForRoute(iter->child_id, iter->route_id);
 836   }
 837
 838   scheduler_.reset();
 839 }
 840
 841 bool ResourceDispatcherHostImpl::OnMessageReceived(
 842     const IPC::Message& message,
 843     ResourceMessageFilter* filter,
 844     bool* message_was_ok) {
 845   filter_ = filter;
 846   bool handled = true;
 847   IPC_BEGIN_MESSAGE_MAP_EX(ResourceDispatcherHostImpl, message, *message_was_ok)
 848     IPC_MESSAGE_HANDLER(ResourceHostMsg_RequestResource, OnRequestResource)
 849     IPC_MESSAGE_HANDLER_DELAY_REPLY(ResourceHostMsg_SyncLoad, OnSyncLoad)
 850     IPC_MESSAGE_HANDLER(ResourceHostMsg_ReleaseDownloadedFile,
 851                         OnReleaseDownloadedFile)
 852     IPC_MESSAGE_HANDLER(ResourceHostMsg_DataDownloaded_ACK, OnDataDownloadedACK)
 853     IPC_MESSAGE_HANDLER(ResourceHostMsg_UploadProgress_ACK, OnUploadProgressACK)
 854     IPC_MESSAGE_HANDLER(ResourceHostMsg_CancelRequest, OnCancelRequest)
 855     IPC_MESSAGE_UNHANDLED(handled = false)
 856   IPC_END_MESSAGE_MAP_EX()
 857
 858   if (!handled && IPC_MESSAGE_ID_CLASS(message.type()) == ResourceMsgStart) {
 859     PickleIterator iter(message);
 860     int request_id = -1;
 861     bool ok = iter.ReadInt(&request_id);
 862     DCHECK(ok);
 863     GlobalRequestID id(filter_->child_id(), request_id);
 864     DelegateMap::iterator it = delegate_map_.find(id);
 865     if (it != delegate_map_.end()) {
 866       ObserverList<ResourceMessageDelegate>::Iterator del_it(*it->second);
 867       ResourceMessageDelegate* delegate;
 868       while (!handled && (delegate = del_it.GetNext()) != NULL) {
 869         handled = delegate->OnMessageReceived(message, message_was_ok);
 870       }
 871     }
 872
 873     // As the unhandled resource message effectively has no consumer, mark it as
 874     // handled to prevent needless propagation through the filter pipeline.
 875     handled = true;
 876   }
 877
 878   filter_ = NULL;
 879   return handled;
 880 }
 881
 882 void ResourceDispatcherHostImpl::OnRequestResource(
 883     const IPC::Message& message,
 884     int request_id,
 885     const ResourceHostMsg_Request& request_data) {
 886   BeginRequest(request_id, request_data, NULL, message.routing_id());
 887 }
 888
 889 // Begins a resource request with the given params on behalf of the specified
 890 // child process.  Responses will be dispatched through the given receiver. The
 891 // process ID is used to lookup WebContentsImpl from routing_id's in the case of
 892 // a request from a renderer.  request_context is the cookie/cache context to be
 893 // used for this request.
 894 //
 895 // If sync_result is non-null, then a SyncLoad reply will be generated, else
 896 // a normal asynchronous set of response messages will be generated.
 897 void ResourceDispatcherHostImpl::OnSyncLoad(
 898     int request_id,
 899     const ResourceHostMsg_Request& request_data,
 900     IPC::Message* sync_result) {
 901   BeginRequest(request_id, request_data, sync_result,
 902                sync_result->routing_id());
 903 }
 904
 905 void ResourceDispatcherHostImpl::UpdateRequestForTransfer(
 906     int child_id,
 907     int route_id,
 908     int request_id,
 909     const ResourceHostMsg_Request& request_data,
 910     const linked_ptr<ResourceLoader>& loader) {
 911   ResourceRequestInfoImpl* info = loader->GetRequestInfo();
 912   GlobalRoutingID old_routing_id(
 913       request_data.transferred_request_child_id, info->GetRouteID());
 914   GlobalRequestID old_request_id(request_data.transferred_request_child_id,
 915                                  request_data.transferred_request_request_id);
 916   GlobalRoutingID new_routing_id(child_id, route_id);
 917   GlobalRequestID new_request_id(child_id, request_id);
 918
 919   // Clear out data that depends on |info| before updating it.
 920   IncrementOutstandingRequestsMemory(-1, *info);
 921   OustandingRequestsStats empty_stats = { 0, 0 };
 922   OustandingRequestsStats old_stats = GetOutstandingRequestsStats(*info);
 923   UpdateOutstandingRequestsStats(*info, empty_stats);
 924   pending_loaders_.erase(old_request_id);
 925
 926   // ResourceHandlers should always get state related to the request from the
 927   // ResourceRequestInfo rather than caching it locally.  This lets us update
 928   // the info object when a transfer occurs.
 929   info->UpdateForTransfer(child_id, route_id, request_data.origin_pid,
 930                           request_id, request_data.parent_render_frame_id,
 931                           filter_->GetWeakPtr());
 932
 933   // Update maps that used the old IDs, if necessary.  Some transfers in tests
 934   // do not actually use a different ID, so not all maps need to be updated.
 935   pending_loaders_[new_request_id] = loader;
 936   UpdateOutstandingRequestsStats(*info, old_stats);
 937   IncrementOutstandingRequestsMemory(1, *info);
 938   if (old_routing_id != new_routing_id) {
 939     if (offline_policy_map_.find(old_routing_id) != offline_policy_map_.end()) {
 940       if (offline_policy_map_.find(new_routing_id) !=
 941           offline_policy_map_.end())
 942         delete offline_policy_map_[new_routing_id];
 943       offline_policy_map_[new_routing_id] = offline_policy_map_[old_routing_id];
 944       offline_policy_map_.erase(old_routing_id);
 945     }
 946     if (blocked_loaders_map_.find(old_routing_id) !=
 947             blocked_loaders_map_.end()) {
 948       blocked_loaders_map_[new_routing_id] =
 949           blocked_loaders_map_[old_routing_id];
 950       blocked_loaders_map_.erase(old_routing_id);
 951     }
 952   }
 953   if (old_request_id != new_request_id) {
 954     DelegateMap::iterator it = delegate_map_.find(old_request_id);
 955     if (it != delegate_map_.end()) {
 956       // Tell each delegate that the request ID has changed.
 957       ObserverList<ResourceMessageDelegate>::Iterator del_it(*it->second);
 958       ResourceMessageDelegate* delegate;
 959       while ((delegate = del_it.GetNext()) != NULL) {
 960         delegate->set_request_id(new_request_id);
 961       }
 962       // Now store the observer list under the new request ID.
 963       delegate_map_[new_request_id] = delegate_map_[old_request_id];
 964       delegate_map_.erase(old_request_id);
 965     }
 966   }
 967
 968   AppCacheInterceptor::CompleteCrossSiteTransfer(
 969       loader->request(),
 970       child_id,
 971       request_data.appcache_host_id);
 972
 973   // We should have a CrossSiteResourceHandler to finish the transfer.
 974   DCHECK(info->cross_site_handler());
 975 }
 976
 977 void ResourceDispatcherHostImpl::BeginRequest(
 978     int request_id,
 979     const ResourceHostMsg_Request& request_data,
 980     IPC::Message* sync_result,  // only valid for sync
 981     int route_id) {
 982   int process_type = filter_->process_type();
 983   int child_id = filter_->child_id();
 984
 985   // Reject invalid priority.
 986   if (request_data.priority < net::MINIMUM_PRIORITY ||
 987       request_data.priority > net::MAXIMUM_PRIORITY) {
 988     RecordAction(base::UserMetricsAction("BadMessageTerminate_RDH"));
 989     filter_->BadMessageReceived();
 990     return;
 991   }
 992
 993   // If we crash here, figure out what URL the renderer was requesting.
 994   // http://crbug.com/91398
 995   char url_buf[128];
 996   base::strlcpy(url_buf, request_data.url.spec().c_str(), arraysize(url_buf));
 997   base::debug::Alias(url_buf);
 998
 999   // If the request that's coming in is being transferred from another process,
1000   // we want to reuse and resume the old loader rather than start a new one.
1001   {
1002     LoaderMap::iterator it = pending_loaders_.find(
1003         GlobalRequestID(request_data.transferred_request_child_id,
1004                         request_data.transferred_request_request_id));
1005     if (it != pending_loaders_.end()) {
1006       // If the request is transferring to a new process, we can update our
1007       // state and let it resume with its existing ResourceHandlers.
1008       if (it->second->is_transferring()) {
1009         linked_ptr<ResourceLoader> deferred_loader = it->second;
1010         UpdateRequestForTransfer(child_id, route_id, request_id,
1011                                  request_data, deferred_loader);
1012
1013         deferred_loader->CompleteTransfer();
1014       } else {
1015         RecordAction(base::UserMetricsAction("BadMessageTerminate_RDH"));
1016         filter_->BadMessageReceived();
1017       }
1018       return;
1019     }
1020   }
1021
1022   ResourceContext* resource_context = NULL;
1023   net::URLRequestContext* request_context = NULL;
1024   filter_->GetContexts(request_data, &resource_context, &request_context);
1025   // http://crbug.com/90971
1026   CHECK(ContainsKey(active_resource_contexts_, resource_context));
1027
1028   if (is_shutdown_ ||
1029       !ShouldServiceRequest(process_type, child_id, request_data,
1030                             filter_->file_system_context())) {
1031     AbortRequestBeforeItStarts(filter_, sync_result, request_id);
1032     return;
1033   }
1034
1035   // Allow the observer to block/handle the request.
1036   if (delegate_ && !delegate_->ShouldBeginRequest(child_id,
1037                                                   route_id,
1038                                                   request_data.method,
1039                                                   request_data.url,
1040                                                   request_data.resource_type,
1041                                                   resource_context)) {
1042     AbortRequestBeforeItStarts(filter_, sync_result, request_id);
1043     return;
1044   }
1045
1046   bool is_sync_load = sync_result != NULL;
1047   int load_flags =
1048       BuildLoadFlagsForRequest(request_data, child_id, is_sync_load);
1049
1050   GlobalRoutingID id(child_id, route_id);
1051   if (!offline_policy_map_[id])
1052     offline_policy_map_[id] = new OfflinePolicy();
1053   load_flags |= offline_policy_map_[id]->GetAdditionalLoadFlags(
1054       load_flags, request_data.resource_type == ResourceType::MAIN_FRAME);
1055
1056   // Sync loads should have maximum priority and should be the only
1057   // requets that have the ignore limits flag set.
1058   if (is_sync_load) {
1059     DCHECK_EQ(request_data.priority, net::MAXIMUM_PRIORITY);
1060     DCHECK_NE(load_flags & net::LOAD_IGNORE_LIMITS, 0);
1061   } else {
1062     DCHECK_EQ(load_flags & net::LOAD_IGNORE_LIMITS, 0);
1063   }
1064
1065   // Construct the request.
1066   net::CookieStore* cookie_store =
1067       GetContentClient()->browser()->OverrideCookieStoreForRenderProcess(
1068           child_id);
1069   scoped_ptr<net::URLRequest> new_request;
1070   new_request = request_context->CreateRequest(
1071       request_data.url, request_data.priority, NULL, cookie_store);
1072
1073   new_request->set_method(request_data.method);
1074   new_request->set_first_party_for_cookies(
1075       request_data.first_party_for_cookies);
1076
1077   const Referrer referrer(request_data.referrer, request_data.referrer_policy);
1078   SetReferrerForRequest(new_request.get(), referrer);
1079
1080   net::HttpRequestHeaders headers;
1081   headers.AddHeadersFromString(request_data.headers);
1082   new_request->SetExtraRequestHeaders(headers);
1083
1084   new_request->SetLoadFlags(load_flags);
1085
1086   // Resolve elements from request_body and prepare upload data.
1087   if (request_data.request_body.get()) {
1088     webkit_blob::BlobStorageContext* blob_context = NULL;
1089     if (filter_->blob_storage_context())
1090       blob_context = filter_->blob_storage_context()->context();
1091     new_request->set_upload(UploadDataStreamBuilder::Build(
1092         request_data.request_body.get(),
1093         blob_context,
1094         filter_->file_system_context(),
1095         BrowserThread::GetMessageLoopProxyForThread(BrowserThread::FILE)
1096             .get()));
1097   }
1098
1099   bool allow_download = request_data.allow_download &&
1100       ResourceType::IsFrame(request_data.resource_type);
1101
1102   // Make extra info and read footer (contains request ID).
1103   ResourceRequestInfoImpl* extra_info =
1104       new ResourceRequestInfoImpl(
1105           process_type,
1106           child_id,
1107           route_id,
1108           request_data.origin_pid,
1109           request_id,
1110           request_data.render_frame_id,
1111           request_data.is_main_frame,
1112           request_data.parent_is_main_frame,
1113           request_data.parent_render_frame_id,
1114           request_data.resource_type,
1115           request_data.transition_type,
1116           request_data.should_replace_current_entry,
1117           false,  // is download
1118           false,  // is stream
1119           allow_download,
1120           request_data.has_user_gesture,
1121           request_data.referrer_policy,
1122           request_data.visiblity_state,
1123           resource_context,
1124           filter_->GetWeakPtr(),
1125           !is_sync_load);
1126   // Request takes ownership.
1127   extra_info->AssociateWithRequest(new_request.get());
1128
1129   if (new_request->url().SchemeIs(kBlobScheme)) {
1130     // Hang on to a reference to ensure the blob is not released prior
1131     // to the job being started.
1132     webkit_blob::BlobProtocolHandler::SetRequestedBlobDataHandle(
1133         new_request.get(),
1134         filter_->blob_storage_context()->context()->
1135             GetBlobDataFromPublicURL(new_request->url()));
1136   }
1137
1138   // Initialize the service worker handler for the request.
1139   ServiceWorkerRequestHandler::InitializeHandler(
1140       new_request.get(),
1141       filter_->service_worker_context(),
1142       child_id,
1143       request_data.service_worker_provider_id,
1144       request_data.resource_type);
1145
1146   // Have the appcache associate its extra info with the request.
1147   AppCacheInterceptor::SetExtraRequestInfo(
1148       new_request.get(), filter_->appcache_service(), child_id,
1149       request_data.appcache_host_id, request_data.resource_type);
1150
1151   scoped_ptr<ResourceHandler> handler(
1152        CreateResourceHandler(
1153            new_request.get(),
1154            request_data, sync_result, route_id, process_type, child_id,
1155            resource_context));
1156
1157   if (handler)
1158     BeginRequestInternal(new_request.Pass(), handler.Pass());
1159 }
1160
1161 scoped_ptr<ResourceHandler> ResourceDispatcherHostImpl::CreateResourceHandler(
1162     net::URLRequest* request,
1163     const ResourceHostMsg_Request& request_data,
1164     IPC::Message* sync_result,
1165     int route_id,
1166     int process_type,
1167     int child_id,
1168     ResourceContext* resource_context) {
1169   // Construct the IPC resource handler.
1170   scoped_ptr<ResourceHandler> handler;
1171   if (sync_result) {
1172     // download_to_file is not supported for synchronous requests.
1173     if (request_data.download_to_file) {
1174       RecordAction(base::UserMetricsAction("BadMessageTerminate_RDH"));
1175       filter_->BadMessageReceived();
1176       return scoped_ptr<ResourceHandler>();
1177     }
1178
1179     handler.reset(new SyncResourceHandler(request, sync_result, this));
1180   } else {
1181     handler.reset(new AsyncResourceHandler(request, this));
1182
1183     // The RedirectToFileResourceHandler depends on being next in the chain.
1184     if (request_data.download_to_file) {
1185       handler.reset(
1186           new RedirectToFileResourceHandler(handler.Pass(), request));
1187     }
1188   }
1189
1190   // Prefetches and <a ping> requests outlive their child process.
1191   if (!sync_result && IsDetachableResourceType(request_data.resource_type)) {
1192     handler.reset(new DetachableResourceHandler(
1193         request,
1194         base::TimeDelta::FromMilliseconds(kDefaultDetachableCancelDelayMs),
1195         handler.Pass()));
1196   }
1197
1198   // Install a CrossSiteResourceHandler for all main frame requests.  This will
1199   // let us check whether a transfer is required and pause for the unload
1200   // handler either if so or if a cross-process navigation is already under way.
1201   bool is_swappable_navigation =
1202       request_data.resource_type == ResourceType::MAIN_FRAME;
1203   // If we are using --site-per-process, install it for subframes as well.
1204   if (!is_swappable_navigation &&
1205       CommandLine::ForCurrentProcess()->HasSwitch(switches::kSitePerProcess)) {
1206     is_swappable_navigation =
1207         request_data.resource_type == ResourceType::SUB_FRAME;
1208   }
1209   if (is_swappable_navigation && process_type == PROCESS_TYPE_RENDERER)
1210     handler.reset(new CrossSiteResourceHandler(handler.Pass(), request));
1211
1212   // Insert a buffered event handler before the actual one.
1213   handler.reset(
1214       new BufferedResourceHandler(handler.Pass(), this, request));
1215
1216   ScopedVector<ResourceThrottle> throttles;
1217   if (delegate_) {
1218     delegate_->RequestBeginning(request,
1219                                 resource_context,
1220                                 filter_->appcache_service(),
1221                                 request_data.resource_type,
1222                                 child_id,
1223                                 route_id,
1224                                 &throttles);
1225   }
1226
1227   if (request->has_upload()) {
1228     // Block power save while uploading data.
1229     throttles.push_back(new PowerSaveBlockResourceThrottle());
1230   }
1231
1232   throttles.push_back(
1233       scheduler_->ScheduleRequest(child_id, route_id, request).release());
1234
1235   handler.reset(
1236       new ThrottlingResourceHandler(handler.Pass(), request, throttles.Pass()));
1237
1238   return handler.Pass();
1239 }
1240
1241 void ResourceDispatcherHostImpl::OnReleaseDownloadedFile(int request_id) {
1242   UnregisterDownloadedTempFile(filter_->child_id(), request_id);
1243 }
1244
1245 void ResourceDispatcherHostImpl::OnDataDownloadedACK(int request_id) {
1246   // TODO(michaeln): maybe throttle DataDownloaded messages
1247 }
1248
1249 void ResourceDispatcherHostImpl::RegisterDownloadedTempFile(
1250     int child_id, int request_id, const base::FilePath& file_path) {
1251   scoped_refptr<ShareableFileReference> reference =
1252       ShareableFileReference::Get(file_path);
1253   DCHECK(reference);
1254
1255   registered_temp_files_[child_id][request_id] = reference;
1256   ChildProcessSecurityPolicyImpl::GetInstance()->GrantReadFile(
1257       child_id, reference->path());
1258
1259   // When the temp file is deleted, revoke permissions that the renderer has
1260   // to that file. This covers an edge case where the file is deleted and then
1261   // the same name is re-used for some other purpose, we don't want the old
1262   // renderer to still have access to it.
1263   //
1264   // We do this when the file is deleted because the renderer can take a blob
1265   // reference to the temp file that outlives the url loaded that it was
1266   // loaded with to keep the file (and permissions) alive.
1267   reference->AddFinalReleaseCallback(
1268       base::Bind(&RemoveDownloadFileFromChildSecurityPolicy,
1269                  child_id));
1270 }
1271
1272 void ResourceDispatcherHostImpl::UnregisterDownloadedTempFile(
1273     int child_id, int request_id) {
1274   DeletableFilesMap& map = registered_temp_files_[child_id];
1275   DeletableFilesMap::iterator found = map.find(request_id);
1276   if (found == map.end())
1277     return;
1278
1279   map.erase(found);
1280
1281   // Note that we don't remove the security bits here. This will be done
1282   // when all file refs are deleted (see RegisterDownloadedTempFile).
1283 }
1284
1285 bool ResourceDispatcherHostImpl::Send(IPC::Message* message) {
1286   delete message;
1287   return false;
1288 }
1289
1290 void ResourceDispatcherHostImpl::OnUploadProgressACK(int request_id) {
1291   ResourceLoader* loader = GetLoader(filter_->child_id(), request_id);
1292   if (loader)
1293     loader->OnUploadProgressACK();
1294 }
1295
1296 // Note that this cancel is subtly different from the other
1297 // CancelRequest methods in this file, which also tear down the loader.
1298 void ResourceDispatcherHostImpl::OnCancelRequest(int request_id) {
1299   int child_id = filter_->child_id();
1300
1301   // When the old renderer dies, it sends a message to us to cancel its
1302   // requests.
1303   if (IsTransferredNavigation(GlobalRequestID(child_id, request_id)))
1304     return;
1305
1306   ResourceLoader* loader = GetLoader(child_id, request_id);
1307   if (!loader) {
1308     // We probably want to remove this warning eventually, but I wanted to be
1309     // able to notice when this happens during initial development since it
1310     // should be rare and may indicate a bug.
1311     DVLOG(1) << "Canceling a request that wasn't found";
1312     return;
1313   }
1314
1315   loader->CancelRequest(true);
1316 }
1317
1318 ResourceRequestInfoImpl* ResourceDispatcherHostImpl::CreateRequestInfo(
1319     int child_id,
1320     int route_id,
1321     bool download,
1322     ResourceContext* context) {
1323   return new ResourceRequestInfoImpl(
1324       PROCESS_TYPE_RENDERER,
1325       child_id,
1326       route_id,
1327       0,
1328       request_id_,
1329       MSG_ROUTING_NONE,  // render_frame_id
1330       false,     // is_main_frame
1331       false,     // parent_is_main_frame
1332       -1,        // parent_render_frame_id
1333       ResourceType::SUB_RESOURCE,
1334       PAGE_TRANSITION_LINK,
1335       false,     // should_replace_current_entry
1336       download,  // is_download
1337       false,     // is_stream
1338       download,  // allow_download
1339       false,     // has_user_gesture
1340       blink::WebReferrerPolicyDefault,
1341       blink::WebPageVisibilityStateVisible,
1342       context,
1343       base::WeakPtr<ResourceMessageFilter>(),  // filter
1344       true);     // is_async
1345 }
1346
1347 void ResourceDispatcherHostImpl::OnRenderViewHostCreated(
1348     int child_id,
1349     int route_id) {
1350   scheduler_->OnClientCreated(child_id, route_id);
1351 }
1352
1353 void ResourceDispatcherHostImpl::OnRenderViewHostDeleted(
1354     int child_id,
1355     int route_id) {
1356   scheduler_->OnClientDeleted(child_id, route_id);
1357   CancelRequestsForRoute(child_id, route_id);
1358 }
1359
1360 // This function is only used for saving feature.
1361 void ResourceDispatcherHostImpl::BeginSaveFile(
1362     const GURL& url,
1363     const Referrer& referrer,
1364     int child_id,
1365     int route_id,
1366     ResourceContext* context) {
1367   if (is_shutdown_)
1368     return;
1369
1370   // http://crbug.com/90971
1371   char url_buf[128];
1372   base::strlcpy(url_buf, url.spec().c_str(), arraysize(url_buf));
1373   base::debug::Alias(url_buf);
1374   CHECK(ContainsKey(active_resource_contexts_, context));
1375
1376   scoped_ptr<ResourceHandler> handler(
1377       new SaveFileResourceHandler(child_id,
1378                                   route_id,
1379                                   url,
1380                                   save_file_manager_.get()));
1381   request_id_--;
1382
1383   const net::URLRequestContext* request_context = context->GetRequestContext();
1384   bool known_proto =
1385       request_context->job_factory()->IsHandledURL(url);
1386   if (!known_proto) {
1387     // Since any URLs which have non-standard scheme have been filtered
1388     // by save manager(see GURL::SchemeIsStandard). This situation
1389     // should not happen.
1390     NOTREACHED();
1391     return;
1392   }
1393
1394   net::CookieStore* cookie_store =
1395       GetContentClient()->browser()->OverrideCookieStoreForRenderProcess(
1396           child_id);
1397   scoped_ptr<net::URLRequest> request(
1398       request_context->CreateRequest(url, net::DEFAULT_PRIORITY, NULL,
1399                                      cookie_store));
1400
1401   request->set_method("GET");
1402   SetReferrerForRequest(request.get(), referrer);
1403
1404   // So far, for saving page, we need fetch content from cache, in the
1405   // future, maybe we can use a configuration to configure this behavior.
1406   request->SetLoadFlags(net::LOAD_PREFERRING_CACHE);
1407
1408   // No need to get offline load flags for save files, but make sure
1409   // we have an OfflinePolicy to receive request completions.
1410   GlobalRoutingID id(child_id, route_id);
1411   if (!offline_policy_map_[id])
1412     offline_policy_map_[id] = new OfflinePolicy();
1413
1414   // Since we're just saving some resources we need, disallow downloading.
1415   ResourceRequestInfoImpl* extra_info =
1416       CreateRequestInfo(child_id, route_id, false, context);
1417   extra_info->AssociateWithRequest(request.get());  // Request takes ownership.
1418
1419   BeginRequestInternal(request.Pass(), handler.Pass());
1420 }
1421
1422 void ResourceDispatcherHostImpl::MarkAsTransferredNavigation(
1423     const GlobalRequestID& id) {
1424   GetLoader(id)->MarkAsTransferring();
1425 }
1426
1427 void ResourceDispatcherHostImpl::CancelTransferringNavigation(
1428     const GlobalRequestID& id) {
1429   // Request should still exist and be in the middle of a transfer.
1430   DCHECK(IsTransferredNavigation(id));
1431   RemovePendingRequest(id.child_id, id.request_id);
1432 }
1433
1434 void ResourceDispatcherHostImpl::ResumeDeferredNavigation(
1435     const GlobalRequestID& id) {
1436   ResourceLoader* loader = GetLoader(id);
1437   if (loader) {
1438     // The response we were meant to resume could have already been canceled.
1439     ResourceRequestInfoImpl* info = loader->GetRequestInfo();
1440     if (info->cross_site_handler())
1441       info->cross_site_handler()->ResumeResponse();
1442   }
1443 }
1444
1445 // The object died, so cancel and detach all requests associated with it except
1446 // for downloads and detachable resources, which belong to the browser process
1447 // even if initiated via a renderer.
1448 void ResourceDispatcherHostImpl::CancelRequestsForProcess(int child_id) {
1449   CancelRequestsForRoute(child_id, -1 /* cancel all */);
1450   registered_temp_files_.erase(child_id);
1451 }
1452
1453 void ResourceDispatcherHostImpl::CancelRequestsForRoute(int child_id,
1454                                                         int route_id) {
1455   // Since pending_requests_ is a map, we first build up a list of all of the
1456   // matching requests to be cancelled, and then we cancel them.  Since there
1457   // may be more than one request to cancel, we cannot simply hold onto the map
1458   // iterators found in the first loop.
1459
1460   // Find the global ID of all matching elements.
1461   bool any_requests_transferring = false;
1462   std::vector<GlobalRequestID> matching_requests;
1463   for (LoaderMap::const_iterator i = pending_loaders_.begin();
1464        i != pending_loaders_.end(); ++i) {
1465     if (i->first.child_id != child_id)
1466       continue;
1467
1468     ResourceRequestInfoImpl* info = i->second->GetRequestInfo();
1469
1470     GlobalRequestID id(child_id, i->first.request_id);
1471     DCHECK(id == i->first);
1472     // Don't cancel navigations that are expected to live beyond this process.
1473     if (IsTransferredNavigation(id))
1474       any_requests_transferring = true;
1475     if (info->detachable_handler()) {
1476       info->detachable_handler()->Detach();
1477     } else if (!info->IsDownload() && !info->is_stream() &&
1478                !IsTransferredNavigation(id) &&
1479                (route_id == -1 || route_id == info->GetRouteID())) {
1480       matching_requests.push_back(id);
1481     }
1482   }
1483
1484   // Remove matches.
1485   for (size_t i = 0; i < matching_requests.size(); ++i) {
1486     LoaderMap::iterator iter = pending_loaders_.find(matching_requests[i]);
1487     // Although every matching request was in pending_requests_ when we built
1488     // matching_requests, it is normal for a matching request to be not found
1489     // in pending_requests_ after we have removed some matching requests from
1490     // pending_requests_.  For example, deleting a net::URLRequest that has
1491     // exclusive (write) access to an HTTP cache entry may unblock another
1492     // net::URLRequest that needs exclusive access to the same cache entry, and
1493     // that net::URLRequest may complete and remove itself from
1494     // pending_requests_. So we need to check that iter is not equal to
1495     // pending_requests_.end().
1496     if (iter != pending_loaders_.end())
1497       RemovePendingLoader(iter);
1498   }
1499
1500   // Don't clear the blocked loaders or offline policy maps if any of the
1501   // requests in route_id are being transferred to a new process, since those
1502   // maps will be updated with the new route_id after the transfer.  Otherwise
1503   // we will lose track of this info when the old route goes away, before the
1504   // new one is created.
1505   if (any_requests_transferring)
1506     return;
1507
1508   // Now deal with blocked requests if any.
1509   if (route_id != -1) {
1510     if (blocked_loaders_map_.find(GlobalRoutingID(child_id, route_id)) !=
1511         blocked_loaders_map_.end()) {
1512       CancelBlockedRequestsForRoute(child_id, route_id);
1513     }
1514   } else {
1515     // We have to do all render views for the process |child_id|.
1516     // Note that we have to do this in 2 passes as we cannot call
1517     // CancelBlockedRequestsForRoute while iterating over
1518     // blocked_loaders_map_, as it modifies it.
1519     std::set<int> route_ids;
1520     for (BlockedLoadersMap::const_iterator iter = blocked_loaders_map_.begin();
1521          iter != blocked_loaders_map_.end(); ++iter) {
1522       if (iter->first.child_id == child_id)
1523         route_ids.insert(iter->first.route_id);
1524     }
1525     for (std::set<int>::const_iterator iter = route_ids.begin();
1526         iter != route_ids.end(); ++iter) {
1527       CancelBlockedRequestsForRoute(child_id, *iter);
1528     }
1529   }
1530
1531   // Cleanup the offline state for the route.
1532   if (-1 != route_id) {
1533     OfflineMap::iterator it = offline_policy_map_.find(
1534         GlobalRoutingID(child_id, route_id));
1535     if (offline_policy_map_.end() != it) {
1536       delete it->second;
1537       offline_policy_map_.erase(it);
1538     }
1539   } else {
1540     for (OfflineMap::iterator it = offline_policy_map_.begin();
1541          offline_policy_map_.end() != it;) {
1542       // Increment iterator so deletion doesn't invalidate it.
1543       OfflineMap::iterator current_it = it++;
1544
1545       if (child_id == current_it->first.child_id) {
1546         delete current_it->second;
1547         offline_policy_map_.erase(current_it);
1548       }
1549     }
1550   }
1551 }
1552
1553 // Cancels the request and removes it from the list.
1554 void ResourceDispatcherHostImpl::RemovePendingRequest(int child_id,
1555                                                       int request_id) {
1556   LoaderMap::iterator i = pending_loaders_.find(
1557       GlobalRequestID(child_id, request_id));
1558   if (i == pending_loaders_.end()) {
1559     NOTREACHED() << "Trying to remove a request that's not here";
1560     return;
1561   }
1562   RemovePendingLoader(i);
1563 }
1564
1565 void ResourceDispatcherHostImpl::RemovePendingLoader(
1566     const LoaderMap::iterator& iter) {
1567   ResourceRequestInfoImpl* info = iter->second->GetRequestInfo();
1568
1569   // Remove the memory credit that we added when pushing the request onto
1570   // the pending list.
1571   IncrementOutstandingRequestsMemory(-1, *info);
1572
1573   pending_loaders_.erase(iter);
1574
1575   // If we have no more pending requests, then stop the load state monitor
1576   if (pending_loaders_.empty() && update_load_states_timer_)
1577     update_load_states_timer_->Stop();
1578 }
1579
1580 void ResourceDispatcherHostImpl::CancelRequest(int child_id,
1581                                                int request_id) {
1582   ResourceLoader* loader = GetLoader(child_id, request_id);
1583   if (!loader) {
1584     // We probably want to remove this warning eventually, but I wanted to be
1585     // able to notice when this happens during initial development since it
1586     // should be rare and may indicate a bug.
1587     DVLOG(1) << "Canceling a request that wasn't found";
1588     return;
1589   }
1590
1591   RemovePendingRequest(child_id, request_id);
1592 }
1593
1594 ResourceDispatcherHostImpl::OustandingRequestsStats
1595 ResourceDispatcherHostImpl::GetOutstandingRequestsStats(
1596     const ResourceRequestInfoImpl& info) {
1597   OutstandingRequestsStatsMap::iterator entry =
1598       outstanding_requests_stats_map_.find(info.GetChildID());
1599   OustandingRequestsStats stats = { 0, 0 };
1600   if (entry != outstanding_requests_stats_map_.end())
1601     stats = entry->second;
1602   return stats;
1603 }
1604
1605 void ResourceDispatcherHostImpl::UpdateOutstandingRequestsStats(
1606     const ResourceRequestInfoImpl& info,
1607     const OustandingRequestsStats& stats) {
1608   if (stats.memory_cost == 0 && stats.num_requests == 0)
1609     outstanding_requests_stats_map_.erase(info.GetChildID());
1610   else
1611     outstanding_requests_stats_map_[info.GetChildID()] = stats;
1612 }
1613
1614 ResourceDispatcherHostImpl::OustandingRequestsStats
1615 ResourceDispatcherHostImpl::IncrementOutstandingRequestsMemory(
1616     int count,
1617     const ResourceRequestInfoImpl& info) {
1618   DCHECK_EQ(1, abs(count));
1619
1620   // Retrieve the previous value (defaulting to 0 if not found).
1621   OustandingRequestsStats stats = GetOutstandingRequestsStats(info);
1622
1623   // Insert/update the total; delete entries when their count reaches 0.
1624   stats.memory_cost += count * info.memory_cost();
1625   DCHECK_GE(stats.memory_cost, 0);
1626   UpdateOutstandingRequestsStats(info, stats);
1627
1628   return stats;
1629 }
1630
1631 ResourceDispatcherHostImpl::OustandingRequestsStats
1632 ResourceDispatcherHostImpl::IncrementOutstandingRequestsCount(
1633     int count,
1634     const ResourceRequestInfoImpl& info) {
1635   DCHECK_EQ(1, abs(count));
1636   num_in_flight_requests_ += count;
1637
1638   OustandingRequestsStats stats = GetOutstandingRequestsStats(info);
1639   stats.num_requests += count;
1640   DCHECK_GE(stats.num_requests, 0);
1641   UpdateOutstandingRequestsStats(info, stats);
1642
1643   return stats;
1644 }
1645
1646 bool ResourceDispatcherHostImpl::HasSufficientResourcesForRequest(
1647     const net::URLRequest* request_) {
1648   const ResourceRequestInfoImpl* info =
1649       ResourceRequestInfoImpl::ForRequest(request_);
1650   OustandingRequestsStats stats = IncrementOutstandingRequestsCount(1, *info);
1651
1652   if (stats.num_requests > max_num_in_flight_requests_per_process_)
1653     return false;
1654   if (num_in_flight_requests_ > max_num_in_flight_requests_)
1655     return false;
1656
1657   return true;
1658 }
1659
1660 void ResourceDispatcherHostImpl::FinishedWithResourcesForRequest(
1661     const net::URLRequest* request_) {
1662   const ResourceRequestInfoImpl* info =
1663       ResourceRequestInfoImpl::ForRequest(request_);
1664   IncrementOutstandingRequestsCount(-1, *info);
1665 }
1666
1667 // static
1668 int ResourceDispatcherHostImpl::CalculateApproximateMemoryCost(
1669     net::URLRequest* request) {
1670   // The following fields should be a minor size contribution (experimentally
1671   // on the order of 100). However since they are variable length, it could
1672   // in theory be a sizeable contribution.
1673   int strings_cost = request->extra_request_headers().ToString().size() +
1674                      request->original_url().spec().size() +
1675                      request->referrer().size() +
1676                      request->method().size();
1677
1678   // Note that this expression will typically be dominated by:
1679   // |kAvgBytesPerOutstandingRequest|.
1680   return kAvgBytesPerOutstandingRequest + strings_cost;
1681 }
1682
1683 void ResourceDispatcherHostImpl::BeginRequestInternal(
1684     scoped_ptr<net::URLRequest> request,
1685     scoped_ptr<ResourceHandler> handler) {
1686   DCHECK(!request->is_pending());
1687   ResourceRequestInfoImpl* info =
1688       ResourceRequestInfoImpl::ForRequest(request.get());
1689
1690   if ((TimeTicks::Now() - last_user_gesture_time_) <
1691       TimeDelta::FromMilliseconds(kUserGestureWindowMs)) {
1692     request->SetLoadFlags(
1693         request->load_flags() | net::LOAD_MAYBE_USER_GESTURE);
1694   }
1695
1696   // Add the memory estimate that starting this request will consume.
1697   info->set_memory_cost(CalculateApproximateMemoryCost(request.get()));
1698
1699   // If enqueing/starting this request will exceed our per-process memory
1700   // bound, abort it right away.
1701   OustandingRequestsStats stats = IncrementOutstandingRequestsMemory(1, *info);
1702   if (stats.memory_cost > max_outstanding_requests_cost_per_process_) {
1703     // We call "CancelWithError()" as a way of setting the net::URLRequest's
1704     // status -- it has no effect beyond this, since the request hasn't started.
1705     request->CancelWithError(net::ERR_INSUFFICIENT_RESOURCES);
1706
1707     bool defer = false;
1708     handler->OnResponseCompleted(info->GetRequestID(), request->status(),
1709                                  std::string(), &defer);
1710     if (defer) {
1711       // TODO(darin): The handler is not ready for us to kill the request. Oops!
1712       NOTREACHED();
1713     }
1714
1715     IncrementOutstandingRequestsMemory(-1, *info);
1716
1717     // A ResourceHandler must not outlive its associated URLRequest.
1718     handler.reset();
1719     return;
1720   }
1721
1722   linked_ptr<ResourceLoader> loader(
1723       new ResourceLoader(request.Pass(), handler.Pass(), this));
1724
1725   GlobalRoutingID id(info->GetGlobalRoutingID());
1726   BlockedLoadersMap::const_iterator iter = blocked_loaders_map_.find(id);
1727   if (iter != blocked_loaders_map_.end()) {
1728     // The request should be blocked.
1729     iter->second->push_back(loader);
1730     return;
1731   }
1732
1733   StartLoading(info, loader);
1734 }
1735
1736 void ResourceDispatcherHostImpl::StartLoading(
1737     ResourceRequestInfoImpl* info,
1738     const linked_ptr<ResourceLoader>& loader) {
1739   pending_loaders_[info->GetGlobalRequestID()] = loader;
1740
1741   loader->StartRequest();
1742 }
1743
1744 void ResourceDispatcherHostImpl::OnUserGesture(WebContentsImpl* contents) {
1745   last_user_gesture_time_ = TimeTicks::Now();
1746 }
1747
1748 net::URLRequest* ResourceDispatcherHostImpl::GetURLRequest(
1749     const GlobalRequestID& id) {
1750   ResourceLoader* loader = GetLoader(id);
1751   if (!loader)
1752     return NULL;
1753
1754   return loader->request();
1755 }
1756
1757 namespace {
1758
1759 // This function attempts to return the "more interesting" load state of |a|
1760 // and |b|.  We don't have temporal information about these load states
1761 // (meaning we don't know when we transitioned into these states), so we just
1762 // rank them according to how "interesting" the states are.
1763 //
1764 // We take advantage of the fact that the load states are an enumeration listed
1765 // in the order in which they occur during the lifetime of a request, so we can
1766 // regard states with larger numeric values as being further along toward
1767 // completion.  We regard those states as more interesting to report since they
1768 // represent progress.
1769 //
1770 // For example, by this measure "tranferring data" is a more interesting state
1771 // than "resolving host" because when we are transferring data we are actually
1772 // doing something that corresponds to changes that the user might observe,
1773 // whereas waiting for a host name to resolve implies being stuck.
1774 //
1775 const net::LoadStateWithParam& MoreInterestingLoadState(
1776     const net::LoadStateWithParam& a, const net::LoadStateWithParam& b) {
1777   return (a.state < b.state) ? b : a;
1778 }
1779
1780 // Carries information about a load state change.
1781 struct LoadInfo {
1782   GURL url;
1783   net::LoadStateWithParam load_state;
1784   uint64 upload_position;
1785   uint64 upload_size;
1786 };
1787
1788 // Map from ProcessID+RouteID pair to LoadState
1789 typedef std::map<GlobalRoutingID, LoadInfo> LoadInfoMap;
1790
1791 // Used to marshal calls to LoadStateChanged from the IO to UI threads.  We do
1792 // them all as a single callback to avoid spamming the UI thread.
1793 void LoadInfoUpdateCallback(const LoadInfoMap& info_map) {
1794   LoadInfoMap::const_iterator i;
1795   for (i = info_map.begin(); i != info_map.end(); ++i) {
1796     RenderViewHostImpl* view =
1797         RenderViewHostImpl::FromID(i->first.child_id, i->first.route_id);
1798     if (view)  // The view could be gone at this point.
1799       view->LoadStateChanged(i->second.url, i->second.load_state,
1800                              i->second.upload_position,
1801                              i->second.upload_size);
1802   }
1803 }
1804
1805 }  // namespace
1806
1807 void ResourceDispatcherHostImpl::UpdateLoadStates() {
1808   // Populate this map with load state changes, and then send them on to the UI
1809   // thread where they can be passed along to the respective RVHs.
1810   LoadInfoMap info_map;
1811
1812   LoaderMap::const_iterator i;
1813
1814   // Determine the largest upload size of all requests
1815   // in each View (good chance it's zero).
1816   std::map<GlobalRoutingID, uint64> largest_upload_size;
1817   for (i = pending_loaders_.begin(); i != pending_loaders_.end(); ++i) {
1818     net::URLRequest* request = i->second->request();
1819     ResourceRequestInfoImpl* info = i->second->GetRequestInfo();
1820     uint64 upload_size = request->GetUploadProgress().size();
1821     if (request->GetLoadState().state != net::LOAD_STATE_SENDING_REQUEST)
1822       upload_size = 0;
1823     GlobalRoutingID id(info->GetGlobalRoutingID());
1824     if (upload_size && largest_upload_size[id] < upload_size)
1825       largest_upload_size[id] = upload_size;
1826   }
1827
1828   for (i = pending_loaders_.begin(); i != pending_loaders_.end(); ++i) {
1829     net::URLRequest* request = i->second->request();
1830     ResourceRequestInfoImpl* info = i->second->GetRequestInfo();
1831     net::LoadStateWithParam load_state = request->GetLoadState();
1832     net::UploadProgress progress = request->GetUploadProgress();
1833
1834     // We also poll for upload progress on this timer and send upload
1835     // progress ipc messages to the plugin process.
1836     i->second->ReportUploadProgress();
1837
1838     GlobalRoutingID id(info->GetGlobalRoutingID());
1839
1840     // If a request is uploading data, ignore all other requests so that the
1841     // upload progress takes priority for being shown in the status bar.
1842     if (largest_upload_size.find(id) != largest_upload_size.end() &&
1843         progress.size() < largest_upload_size[id])
1844       continue;
1845
1846     net::LoadStateWithParam to_insert = load_state;
1847     LoadInfoMap::iterator existing = info_map.find(id);
1848     if (existing != info_map.end()) {
1849       to_insert =
1850           MoreInterestingLoadState(existing->second.load_state, load_state);
1851       if (to_insert.state == existing->second.load_state.state)
1852         continue;
1853     }
1854     LoadInfo& load_info = info_map[id];
1855     load_info.url = request->url();
1856     load_info.load_state = to_insert;
1857     load_info.upload_size = progress.size();
1858     load_info.upload_position = progress.position();
1859   }
1860
1861   if (info_map.empty())
1862     return;
1863
1864   BrowserThread::PostTask(
1865       BrowserThread::UI, FROM_HERE,
1866       base::Bind(&LoadInfoUpdateCallback, info_map));
1867 }
1868
1869 void ResourceDispatcherHostImpl::BlockRequestsForRoute(int child_id,
1870                                                        int route_id) {
1871   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
1872   GlobalRoutingID key(child_id, route_id);
1873   DCHECK(blocked_loaders_map_.find(key) == blocked_loaders_map_.end()) <<
1874       "BlockRequestsForRoute called  multiple time for the same RVH";
1875   blocked_loaders_map_[key] = new BlockedLoadersList();
1876 }
1877
1878 void ResourceDispatcherHostImpl::ResumeBlockedRequestsForRoute(int child_id,
1879                                                                int route_id) {
1880   ProcessBlockedRequestsForRoute(child_id, route_id, false);
1881 }
1882
1883 void ResourceDispatcherHostImpl::CancelBlockedRequestsForRoute(int child_id,
1884                                                                int route_id) {
1885   ProcessBlockedRequestsForRoute(child_id, route_id, true);
1886 }
1887
1888 void ResourceDispatcherHostImpl::ProcessBlockedRequestsForRoute(
1889     int child_id,
1890     int route_id,
1891     bool cancel_requests) {
1892   BlockedLoadersMap::iterator iter = blocked_loaders_map_.find(
1893       GlobalRoutingID(child_id, route_id));
1894   if (iter == blocked_loaders_map_.end()) {
1895     // It's possible to reach here if the renderer crashed while an interstitial
1896     // page was showing.
1897     return;
1898   }
1899
1900   BlockedLoadersList* loaders = iter->second;
1901
1902   // Removing the vector from the map unblocks any subsequent requests.
1903   blocked_loaders_map_.erase(iter);
1904
1905   for (BlockedLoadersList::iterator loaders_iter = loaders->begin();
1906        loaders_iter != loaders->end(); ++loaders_iter) {
1907     linked_ptr<ResourceLoader> loader = *loaders_iter;
1908     ResourceRequestInfoImpl* info = loader->GetRequestInfo();
1909     if (cancel_requests) {
1910       IncrementOutstandingRequestsMemory(-1, *info);
1911     } else {
1912       StartLoading(info, loader);
1913     }
1914   }
1915
1916   delete loaders;
1917 }
1918
1919 ResourceDispatcherHostImpl::HttpAuthRelationType
1920 ResourceDispatcherHostImpl::HttpAuthRelationTypeOf(
1921     const GURL& request_url,
1922     const GURL& first_party) {
1923   if (!first_party.is_valid())
1924     return HTTP_AUTH_RELATION_TOP;
1925
1926   if (net::registry_controlled_domains::SameDomainOrHost(
1927           first_party, request_url,
1928           net::registry_controlled_domains::INCLUDE_PRIVATE_REGISTRIES))
1929     return HTTP_AUTH_RELATION_SAME_DOMAIN;
1930
1931   if (allow_cross_origin_auth_prompt())
1932     return HTTP_AUTH_RELATION_ALLOWED_CROSS;
1933
1934   return HTTP_AUTH_RELATION_BLOCKED_CROSS;
1935 }
1936
1937 bool ResourceDispatcherHostImpl::allow_cross_origin_auth_prompt() {
1938   return allow_cross_origin_auth_prompt_;
1939 }
1940
1941 bool ResourceDispatcherHostImpl::IsTransferredNavigation(
1942     const GlobalRequestID& id) const {
1943   ResourceLoader* loader = GetLoader(id);
1944   return loader ? loader->is_transferring() : false;
1945 }
1946
1947 ResourceLoader* ResourceDispatcherHostImpl::GetLoader(
1948     const GlobalRequestID& id) const {
1949   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
1950
1951   LoaderMap::const_iterator i = pending_loaders_.find(id);
1952   if (i == pending_loaders_.end())
1953     return NULL;
1954
1955   return i->second.get();
1956 }
1957
1958 ResourceLoader* ResourceDispatcherHostImpl::GetLoader(int child_id,
1959                                                       int request_id) const {
1960   return GetLoader(GlobalRequestID(child_id, request_id));
1961 }
1962
1963 void ResourceDispatcherHostImpl::RegisterResourceMessageDelegate(
1964     const GlobalRequestID& id, ResourceMessageDelegate* delegate) {
1965   DelegateMap::iterator it = delegate_map_.find(id);
1966   if (it == delegate_map_.end()) {
1967     it = delegate_map_.insert(
1968         std::make_pair(id, new ObserverList<ResourceMessageDelegate>)).first;
1969   }
1970   it->second->AddObserver(delegate);
1971 }
1972
1973 void ResourceDispatcherHostImpl::UnregisterResourceMessageDelegate(
1974     const GlobalRequestID& id, ResourceMessageDelegate* delegate) {
1975   DCHECK(ContainsKey(delegate_map_, id));
1976   DelegateMap::iterator it = delegate_map_.find(id);
1977   DCHECK(it->second->HasObserver(delegate));
1978   it->second->RemoveObserver(delegate);
1979   if (!it->second->might_have_observers()) {
1980     delete it->second;
1981     delegate_map_.erase(it);
1982   }
1983 }
1984
1985 int ResourceDispatcherHostImpl::BuildLoadFlagsForRequest(
1986     const ResourceHostMsg_Request& request_data,
1987     int child_id,
1988     bool is_sync_load) {
1989   int load_flags = request_data.load_flags;
1990
1991   // Although EV status is irrelevant to sub-frames and sub-resources, we have
1992   // to perform EV certificate verification on all resources because an HTTP
1993   // keep-alive connection created to load a sub-frame or a sub-resource could
1994   // be reused to load a main frame.
1995   load_flags |= net::LOAD_VERIFY_EV_CERT;
1996   if (request_data.resource_type == ResourceType::MAIN_FRAME) {
1997     load_flags |= net::LOAD_MAIN_FRAME;
1998   } else if (request_data.resource_type == ResourceType::SUB_FRAME) {
1999     load_flags |= net::LOAD_SUB_FRAME;
2000   } else if (request_data.resource_type == ResourceType::PREFETCH) {
2001     load_flags |= (net::LOAD_PREFETCH | net::LOAD_DO_NOT_PROMPT_FOR_LOGIN);
2002   } else if (request_data.resource_type == ResourceType::FAVICON) {
2003     load_flags |= net::LOAD_DO_NOT_PROMPT_FOR_LOGIN;
2004   } else if (request_data.resource_type == ResourceType::IMAGE) {
2005     // Prevent third-party image content from prompting for login, as this
2006     // is often a scam to extract credentials for another domain from the user.
2007     // Only block image loads, as the attack applies largely to the "src"
2008     // property of the <img> tag. It is common for web properties to allow
2009     // untrusted values for <img src>; this is considered a fair thing for an
2010     // HTML sanitizer to do. Conversely, any HTML sanitizer that didn't
2011     // filter sources for <script>, <link>, <embed>, <object>, <iframe> tags
2012     // would be considered vulnerable in and of itself.
2013     HttpAuthRelationType relation_type = HttpAuthRelationTypeOf(
2014         request_data.url, request_data.first_party_for_cookies);
2015     if (relation_type == HTTP_AUTH_RELATION_BLOCKED_CROSS) {
2016       load_flags |= (net::LOAD_DO_NOT_USE_EMBEDDED_IDENTITY |
2017                      net::LOAD_DO_NOT_PROMPT_FOR_LOGIN);
2018     }
2019   }
2020
2021   if (is_sync_load)
2022     load_flags |= net::LOAD_IGNORE_LIMITS;
2023
2024   ChildProcessSecurityPolicyImpl* policy =
2025       ChildProcessSecurityPolicyImpl::GetInstance();
2026   if (!policy->CanSendCookiesForOrigin(child_id, request_data.url)) {
2027     load_flags |= (net::LOAD_DO_NOT_SEND_COOKIES |
2028                    net::LOAD_DO_NOT_SEND_AUTH_DATA |
2029                    net::LOAD_DO_NOT_SAVE_COOKIES);
2030   }
2031
2032   // Raw headers are sensitive, as they include Cookie/Set-Cookie, so only
2033   // allow requesting them if requester has ReadRawCookies permission.
2034   if ((load_flags & net::LOAD_REPORT_RAW_HEADERS)
2035       && !policy->CanReadRawCookies(child_id)) {
2036     VLOG(1) << "Denied unauthorized request for raw headers";
2037     load_flags &= ~net::LOAD_REPORT_RAW_HEADERS;
2038   }
2039
2040   return load_flags;
2041 }
2042
2043 }  // namespace content