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/frame_host/navigation_request_info.h"
  36 #include "content/browser/loader/async_resource_handler.h"
  37 #include "content/browser/loader/buffered_resource_handler.h"
  38 #include "content/browser/loader/cross_site_resource_handler.h"
  39 #include "content/browser/loader/detachable_resource_handler.h"
  40 #include "content/browser/loader/power_save_block_resource_throttle.h"
  41 #include "content/browser/loader/redirect_to_file_resource_handler.h"
  42 #include "content/browser/loader/resource_message_filter.h"
  43 #include "content/browser/loader/resource_request_info_impl.h"
  44 #include "content/browser/loader/stream_resource_handler.h"
  45 #include "content/browser/loader/sync_resource_handler.h"
  46 #include "content/browser/loader/throttling_resource_handler.h"
  47 #include "content/browser/loader/upload_data_stream_builder.h"
  48 #include "content/browser/plugin_service_impl.h"
  49 #include "content/browser/renderer_host/render_view_host_delegate.h"
  50 #include "content/browser/renderer_host/render_view_host_impl.h"
  51 #include "content/browser/resource_context_impl.h"
  52 #include "content/browser/service_worker/service_worker_request_handler.h"
  53 #include "content/browser/streams/stream.h"
  54 #include "content/browser/streams/stream_context.h"
  55 #include "content/browser/streams/stream_registry.h"
  56 #include "content/browser/worker_host/worker_service_impl.h"
  57 #include "content/browser/web_contents/web_contents_impl.h"
  58 #include "content/common/appcache_interfaces.h"
  59 #include "content/common/resource_messages.h"
  60 #include "content/common/ssl_status_serialization.h"
  61 #include "content/common/view_messages.h"
  62 #include "content/public/browser/browser_thread.h"
  63 #include "content/public/browser/content_browser_client.h"
  64 #include "content/public/browser/download_manager.h"
  65 #include "content/public/browser/download_url_parameters.h"
  66 #include "content/public/browser/global_request_id.h"
  67 #include "content/public/browser/resource_dispatcher_host_delegate.h"
  68 #include "content/public/browser/resource_request_details.h"
  69 #include "content/public/browser/resource_throttle.h"
  70 #include "content/public/browser/stream_handle.h"
  71 #include "content/public/browser/user_metrics.h"
  72 #include "content/public/common/content_switches.h"
  73 #include "content/public/common/process_type.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 "url/url_constants.h"
  92 #include "webkit/common/blob/blob_data.h"
  93 #include "webkit/browser/blob/blob_data_handle.h"
  94 #include "webkit/browser/blob/blob_storage_context.h"
  95 #include "webkit/browser/blob/blob_url_request_job_factory.h"
  96 #include "webkit/browser/fileapi/file_permission_policy.h"
  97 #include "webkit/browser/fileapi/file_system_context.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 webkit_blob::BlobStorageContext* GetBlobStorageContext(
 314     ResourceMessageFilter* filter) {
 315   if (!filter->blob_storage_context())
 316     return NULL;
 317   return filter->blob_storage_context()->context();
 318 }
 319
 320 }  // namespace
 321
 322 // static
 323 ResourceDispatcherHost* ResourceDispatcherHost::Get() {
 324   return g_resource_dispatcher_host;
 325 }
 326
 327 ResourceDispatcherHostImpl::ResourceDispatcherHostImpl()
 328     : save_file_manager_(new SaveFileManager()),
 329       request_id_(-1),
 330       is_shutdown_(false),
 331       num_in_flight_requests_(0),
 332       max_num_in_flight_requests_(base::SharedMemory::GetHandleLimit()),
 333       max_num_in_flight_requests_per_process_(
 334           static_cast<int>(
 335               max_num_in_flight_requests_ * kMaxRequestsPerProcessRatio)),
 336       max_outstanding_requests_cost_per_process_(
 337           kMaxOutstandingRequestsCostPerProcess),
 338       filter_(NULL),
 339       delegate_(NULL),
 340       allow_cross_origin_auth_prompt_(false) {
 341   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 342   DCHECK(!g_resource_dispatcher_host);
 343   g_resource_dispatcher_host = this;
 344
 345   GetContentClient()->browser()->ResourceDispatcherHostCreated();
 346
 347   ANNOTATE_BENIGN_RACE(
 348       &last_user_gesture_time_,
 349       "We don't care about the precise value, see http://crbug.com/92889");
 350
 351   BrowserThread::PostTask(BrowserThread::IO,
 352                           FROM_HERE,
 353                           base::Bind(&ResourceDispatcherHostImpl::OnInit,
 354                                      base::Unretained(this)));
 355
 356   update_load_states_timer_.reset(
 357       new base::RepeatingTimer<ResourceDispatcherHostImpl>());
 358 }
 359
 360 ResourceDispatcherHostImpl::~ResourceDispatcherHostImpl() {
 361   DCHECK(outstanding_requests_stats_map_.empty());
 362   DCHECK(g_resource_dispatcher_host);
 363   g_resource_dispatcher_host = NULL;
 364 }
 365
 366 // static
 367 ResourceDispatcherHostImpl* ResourceDispatcherHostImpl::Get() {
 368   return g_resource_dispatcher_host;
 369 }
 370
 371 void ResourceDispatcherHostImpl::SetDelegate(
 372     ResourceDispatcherHostDelegate* delegate) {
 373   delegate_ = delegate;
 374 }
 375
 376 void ResourceDispatcherHostImpl::SetAllowCrossOriginAuthPrompt(bool value) {
 377   allow_cross_origin_auth_prompt_ = value;
 378 }
 379
 380 void ResourceDispatcherHostImpl::AddResourceContext(ResourceContext* context) {
 381   active_resource_contexts_.insert(context);
 382 }
 383
 384 void ResourceDispatcherHostImpl::RemoveResourceContext(
 385     ResourceContext* context) {
 386   CHECK(ContainsKey(active_resource_contexts_, context));
 387   active_resource_contexts_.erase(context);
 388 }
 389
 390 void ResourceDispatcherHostImpl::ResumeResponseDeferredAtStart(
 391     const GlobalRequestID& id) {
 392   ResourceLoader* loader = GetLoader(id);
 393   if (loader) {
 394     // The response we were meant to resume could have already been canceled.
 395     ResourceRequestInfoImpl* info = loader->GetRequestInfo();
 396     if (info->cross_site_handler())
 397       info->cross_site_handler()->ResumeResponseDeferredAtStart(id.request_id);
 398   }
 399 }
 400
 401 void ResourceDispatcherHostImpl::CancelRequestsForContext(
 402     ResourceContext* context) {
 403   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 404   DCHECK(context);
 405
 406   CHECK(ContainsKey(active_resource_contexts_, context));
 407
 408   // Note that request cancellation has side effects. Therefore, we gather all
 409   // the requests to cancel first, and then we start cancelling. We assert at
 410   // the end that there are no more to cancel since the context is about to go
 411   // away.
 412   typedef std::vector<linked_ptr<ResourceLoader> > LoaderList;
 413   LoaderList loaders_to_cancel;
 414
 415   for (LoaderMap::iterator i = pending_loaders_.begin();
 416        i != pending_loaders_.end();) {
 417     if (i->second->GetRequestInfo()->GetContext() == context) {
 418       loaders_to_cancel.push_back(i->second);
 419       IncrementOutstandingRequestsMemory(-1, *i->second->GetRequestInfo());
 420       pending_loaders_.erase(i++);
 421     } else {
 422       ++i;
 423     }
 424   }
 425
 426   for (BlockedLoadersMap::iterator i = blocked_loaders_map_.begin();
 427        i != blocked_loaders_map_.end();) {
 428     BlockedLoadersList* loaders = i->second;
 429     if (loaders->empty()) {
 430       // This can happen if BlockRequestsForRoute() has been called for a route,
 431       // but we haven't blocked any matching requests yet.
 432       ++i;
 433       continue;
 434     }
 435     ResourceRequestInfoImpl* info = loaders->front()->GetRequestInfo();
 436     if (info->GetContext() == context) {
 437       blocked_loaders_map_.erase(i++);
 438       for (BlockedLoadersList::const_iterator it = loaders->begin();
 439            it != loaders->end(); ++it) {
 440         linked_ptr<ResourceLoader> loader = *it;
 441         info = loader->GetRequestInfo();
 442         // We make the assumption that all requests on the list have the same
 443         // ResourceContext.
 444         DCHECK_EQ(context, info->GetContext());
 445         IncrementOutstandingRequestsMemory(-1, *info);
 446         loaders_to_cancel.push_back(loader);
 447       }
 448       delete loaders;
 449     } else {
 450       ++i;
 451     }
 452   }
 453
 454 #ifndef NDEBUG
 455   for (LoaderList::iterator i = loaders_to_cancel.begin();
 456        i != loaders_to_cancel.end(); ++i) {
 457     // There is no strict requirement that this be the case, but currently
 458     // downloads, streams, detachable requests, and transferred requests are the
 459     // only requests that aren't cancelled when the associated processes go
 460     // away. It may be OK for this invariant to change in the future, but if
 461     // this assertion fires without the invariant changing, then it's indicative
 462     // of a leak.
 463     DCHECK((*i)->GetRequestInfo()->IsDownload() ||
 464            (*i)->GetRequestInfo()->is_stream() ||
 465            ((*i)->GetRequestInfo()->detachable_handler() &&
 466             (*i)->GetRequestInfo()->detachable_handler()->is_detached()) ||
 467            (*i)->is_transferring());
 468   }
 469 #endif
 470
 471   loaders_to_cancel.clear();
 472
 473   // Validate that no more requests for this context were added.
 474   for (LoaderMap::const_iterator i = pending_loaders_.begin();
 475        i != pending_loaders_.end(); ++i) {
 476     // http://crbug.com/90971
 477     CHECK_NE(i->second->GetRequestInfo()->GetContext(), context);
 478   }
 479
 480   for (BlockedLoadersMap::const_iterator i = blocked_loaders_map_.begin();
 481        i != blocked_loaders_map_.end(); ++i) {
 482     BlockedLoadersList* loaders = i->second;
 483     if (!loaders->empty()) {
 484       ResourceRequestInfoImpl* info = loaders->front()->GetRequestInfo();
 485       // http://crbug.com/90971
 486       CHECK_NE(info->GetContext(), context);
 487     }
 488   }
 489 }
 490
 491 DownloadInterruptReason ResourceDispatcherHostImpl::BeginDownload(
 492     scoped_ptr<net::URLRequest> request,
 493     const Referrer& referrer,
 494     bool is_content_initiated,
 495     ResourceContext* context,
 496     int child_id,
 497     int route_id,
 498     bool prefer_cache,
 499     scoped_ptr<DownloadSaveInfo> save_info,
 500     uint32 download_id,
 501     const DownloadStartedCallback& started_callback) {
 502   if (is_shutdown_)
 503     return CallbackAndReturn(started_callback,
 504                              DOWNLOAD_INTERRUPT_REASON_USER_SHUTDOWN);
 505
 506   const GURL& url = request->original_url();
 507
 508   // http://crbug.com/90971
 509   char url_buf[128];
 510   base::strlcpy(url_buf, url.spec().c_str(), arraysize(url_buf));
 511   base::debug::Alias(url_buf);
 512   CHECK(ContainsKey(active_resource_contexts_, context));
 513
 514   SetReferrerForRequest(request.get(), referrer);
 515
 516   int extra_load_flags = net::LOAD_IS_DOWNLOAD;
 517   if (prefer_cache) {
 518     // If there is upload data attached, only retrieve from cache because there
 519     // is no current mechanism to prompt the user for their consent for a
 520     // re-post. For GETs, try to retrieve data from the cache and skip
 521     // validating the entry if present.
 522     if (request->get_upload() != NULL)
 523       extra_load_flags |= net::LOAD_ONLY_FROM_CACHE;
 524     else
 525       extra_load_flags |= net::LOAD_PREFERRING_CACHE;
 526   } else {
 527     extra_load_flags |= net::LOAD_DISABLE_CACHE;
 528   }
 529   request->SetLoadFlags(request->load_flags() | extra_load_flags);
 530
 531   // Check if the renderer is permitted to request the requested URL.
 532   if (!ChildProcessSecurityPolicyImpl::GetInstance()->
 533           CanRequestURL(child_id, url)) {
 534     VLOG(1) << "Denied unauthorized download request for "
 535             << url.possibly_invalid_spec();
 536     return CallbackAndReturn(started_callback,
 537                              DOWNLOAD_INTERRUPT_REASON_NETWORK_INVALID_REQUEST);
 538   }
 539
 540   request_id_--;
 541
 542   const net::URLRequestContext* request_context = context->GetRequestContext();
 543   if (!request_context->job_factory()->IsHandledURL(url)) {
 544     VLOG(1) << "Download request for unsupported protocol: "
 545             << url.possibly_invalid_spec();
 546     return CallbackAndReturn(started_callback,
 547                              DOWNLOAD_INTERRUPT_REASON_NETWORK_INVALID_REQUEST);
 548   }
 549
 550   ResourceRequestInfoImpl* extra_info =
 551       CreateRequestInfo(child_id, route_id, true, context);
 552   extra_info->AssociateWithRequest(request.get());  // Request takes ownership.
 553
 554   if (request->url().SchemeIs(url::kBlobScheme)) {
 555     ChromeBlobStorageContext* blob_context =
 556         GetChromeBlobStorageContextForResourceContext(context);
 557     webkit_blob::BlobProtocolHandler::SetRequestedBlobDataHandle(
 558         request.get(),
 559         blob_context->context()->GetBlobDataFromPublicURL(request->url()));
 560   }
 561
 562   // From this point forward, the |DownloadResourceHandler| is responsible for
 563   // |started_callback|.
 564   scoped_ptr<ResourceHandler> handler(
 565       CreateResourceHandlerForDownload(request.get(), is_content_initiated,
 566                                        true, download_id, save_info.Pass(),
 567                                        started_callback));
 568
 569   BeginRequestInternal(request.Pass(), handler.Pass());
 570
 571   return DOWNLOAD_INTERRUPT_REASON_NONE;
 572 }
 573
 574 void ResourceDispatcherHostImpl::ClearLoginDelegateForRequest(
 575     net::URLRequest* request) {
 576   ResourceRequestInfoImpl* info = ResourceRequestInfoImpl::ForRequest(request);
 577   if (info) {
 578     ResourceLoader* loader = GetLoader(info->GetGlobalRequestID());
 579     if (loader)
 580       loader->ClearLoginDelegate();
 581   }
 582 }
 583
 584 void ResourceDispatcherHostImpl::Shutdown() {
 585   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 586   BrowserThread::PostTask(BrowserThread::IO,
 587                           FROM_HERE,
 588                           base::Bind(&ResourceDispatcherHostImpl::OnShutdown,
 589                                      base::Unretained(this)));
 590 }
 591
 592 scoped_ptr<ResourceHandler>
 593 ResourceDispatcherHostImpl::CreateResourceHandlerForDownload(
 594     net::URLRequest* request,
 595     bool is_content_initiated,
 596     bool must_download,
 597     uint32 id,
 598     scoped_ptr<DownloadSaveInfo> save_info,
 599     const DownloadUrlParameters::OnStartedCallback& started_cb) {
 600   scoped_ptr<ResourceHandler> handler(
 601       new DownloadResourceHandler(id, request, started_cb, save_info.Pass()));
 602   if (delegate_) {
 603     const ResourceRequestInfo* request_info(
 604         ResourceRequestInfo::ForRequest(request));
 605
 606     ScopedVector<ResourceThrottle> throttles;
 607     delegate_->DownloadStarting(
 608         request, request_info->GetContext(), request_info->GetChildID(),
 609         request_info->GetRouteID(), request_info->GetRequestID(),
 610         is_content_initiated, must_download, &throttles);
 611     if (!throttles.empty()) {
 612       handler.reset(
 613           new ThrottlingResourceHandler(
 614               handler.Pass(), request, throttles.Pass()));
 615     }
 616   }
 617   return handler.Pass();
 618 }
 619
 620 scoped_ptr<ResourceHandler>
 621 ResourceDispatcherHostImpl::MaybeInterceptAsStream(net::URLRequest* request,
 622                                                    ResourceResponse* response,
 623                                                    std::string* payload) {
 624   ResourceRequestInfoImpl* info = ResourceRequestInfoImpl::ForRequest(request);
 625   const std::string& mime_type = response->head.mime_type;
 626
 627   GURL origin;
 628   if (!delegate_ ||
 629       !delegate_->ShouldInterceptResourceAsStream(request,
 630                                                   mime_type,
 631                                                   &origin,
 632                                                   payload)) {
 633     return scoped_ptr<ResourceHandler>();
 634   }
 635
 636   StreamContext* stream_context =
 637       GetStreamContextForResourceContext(info->GetContext());
 638
 639   scoped_ptr<StreamResourceHandler> handler(
 640       new StreamResourceHandler(request,
 641                                 stream_context->registry(),
 642                                 origin));
 643
 644   info->set_is_stream(true);
 645   delegate_->OnStreamCreated(
 646       request,
 647       handler->stream()->CreateHandle(
 648           request->url(),
 649           mime_type,
 650           response->head.headers));
 651   return handler.PassAs<ResourceHandler>();
 652 }
 653
 654 void ResourceDispatcherHostImpl::ClearSSLClientAuthHandlerForRequest(
 655     net::URLRequest* request) {
 656   ResourceRequestInfoImpl* info = ResourceRequestInfoImpl::ForRequest(request);
 657   if (info) {
 658     ResourceLoader* loader = GetLoader(info->GetGlobalRequestID());
 659     if (loader)
 660       loader->ClearSSLClientAuthHandler();
 661   }
 662 }
 663
 664 ResourceDispatcherHostLoginDelegate*
 665 ResourceDispatcherHostImpl::CreateLoginDelegate(
 666     ResourceLoader* loader,
 667     net::AuthChallengeInfo* auth_info) {
 668   if (!delegate_)
 669     return NULL;
 670
 671   return delegate_->CreateLoginDelegate(auth_info, loader->request());
 672 }
 673
 674 bool ResourceDispatcherHostImpl::HandleExternalProtocol(ResourceLoader* loader,
 675                                                         const GURL& url) {
 676   if (!delegate_)
 677     return false;
 678
 679   ResourceRequestInfoImpl* info = loader->GetRequestInfo();
 680
 681   if (!ResourceType::IsFrame(info->GetResourceType()))
 682     return false;
 683
 684   const net::URLRequestJobFactory* job_factory =
 685       info->GetContext()->GetRequestContext()->job_factory();
 686   if (job_factory->IsHandledURL(url))
 687     return false;
 688
 689   bool initiated_by_user_gesture =
 690       (loader->request()->load_flags() & net::LOAD_MAYBE_USER_GESTURE) != 0;
 691   bool handled = delegate_->HandleExternalProtocol(url, info->GetChildID(),
 692                                                    info->GetRouteID(),
 693                                                    initiated_by_user_gesture);
 694   // Consume the user gesture if the external protocol dialog is shown.
 695   if (handled)
 696     last_user_gesture_time_ = base::TimeTicks();
 697   return handled;
 698 }
 699
 700 void ResourceDispatcherHostImpl::DidStartRequest(ResourceLoader* loader) {
 701   // Make sure we have the load state monitor running
 702   if (!update_load_states_timer_->IsRunning()) {
 703     update_load_states_timer_->Start(FROM_HERE,
 704         TimeDelta::FromMilliseconds(kUpdateLoadStatesIntervalMsec),
 705         this, &ResourceDispatcherHostImpl::UpdateLoadStates);
 706   }
 707 }
 708
 709 void ResourceDispatcherHostImpl::DidReceiveRedirect(ResourceLoader* loader,
 710                                                     const GURL& new_url) {
 711   ResourceRequestInfoImpl* info = loader->GetRequestInfo();
 712
 713   int render_process_id, render_frame_host;
 714   if (!info->GetAssociatedRenderFrame(&render_process_id, &render_frame_host))
 715     return;
 716
 717   // Notify the observers on the UI thread.
 718   scoped_ptr<ResourceRedirectDetails> detail(new ResourceRedirectDetails(
 719       loader->request(),
 720       GetCertID(loader->request(), info->GetChildID()),
 721       new_url));
 722   BrowserThread::PostTask(
 723       BrowserThread::UI, FROM_HERE,
 724       base::Bind(
 725           &NotifyRedirectOnUI,
 726           render_process_id, render_frame_host, base::Passed(&detail)));
 727 }
 728
 729 void ResourceDispatcherHostImpl::DidReceiveResponse(ResourceLoader* loader) {
 730   ResourceRequestInfoImpl* info = loader->GetRequestInfo();
 731
 732   if (loader->request()->was_fetched_via_proxy() &&
 733       loader->request()->was_fetched_via_spdy() &&
 734       loader->request()->url().SchemeIs("http")) {
 735     scheduler_->OnReceivedSpdyProxiedHttpResponse(
 736         info->GetChildID(), info->GetRouteID());
 737   }
 738
 739   int render_process_id, render_frame_host;
 740   if (!info->GetAssociatedRenderFrame(&render_process_id, &render_frame_host))
 741     return;
 742
 743   // Notify the observers on the UI thread.
 744   scoped_ptr<ResourceRequestDetails> detail(new ResourceRequestDetails(
 745       loader->request(),
 746       GetCertID(loader->request(), info->GetChildID())));
 747   BrowserThread::PostTask(
 748       BrowserThread::UI, FROM_HERE,
 749       base::Bind(
 750           &NotifyResponseOnUI,
 751           render_process_id, render_frame_host, base::Passed(&detail)));
 752 }
 753
 754 void ResourceDispatcherHostImpl::DidFinishLoading(ResourceLoader* loader) {
 755   ResourceRequestInfo* info = loader->GetRequestInfo();
 756
 757   // Record final result of all resource loads.
 758   if (info->GetResourceType() == ResourceType::MAIN_FRAME) {
 759     // This enumeration has "3" appended to its name to distinguish it from
 760     // older versions.
 761     UMA_HISTOGRAM_SPARSE_SLOWLY(
 762         "Net.ErrorCodesForMainFrame3",
 763         -loader->request()->status().error());
 764
 765     if (loader->request()->url().SchemeIsSecure()) {
 766       if (loader->request()->url().host() == "www.google.com") {
 767         UMA_HISTOGRAM_SPARSE_SLOWLY("Net.ErrorCodesForHTTPSGoogleMainFrame2",
 768                                     -loader->request()->status().error());
 769       }
 770
 771       int num_valid_scts = std::count_if(
 772           loader->request()->ssl_info().signed_certificate_timestamps.begin(),
 773           loader->request()->ssl_info().signed_certificate_timestamps.end(),
 774           IsValidatedSCT);
 775       UMA_HISTOGRAM_COUNTS_100(
 776           "Net.CertificateTransparency.MainFrameValidSCTCount", num_valid_scts);
 777     }
 778   } else {
 779     if (info->GetResourceType() == ResourceType::IMAGE) {
 780       UMA_HISTOGRAM_SPARSE_SLOWLY(
 781           "Net.ErrorCodesForImages",
 782           -loader->request()->status().error());
 783     }
 784     // This enumeration has "2" appended to distinguish it from older versions.
 785     UMA_HISTOGRAM_SPARSE_SLOWLY(
 786         "Net.ErrorCodesForSubresources2",
 787         -loader->request()->status().error());
 788   }
 789
 790   if (delegate_)
 791     delegate_->RequestComplete(loader->request());
 792
 793   // Destroy the ResourceLoader.
 794   RemovePendingRequest(info->GetChildID(), info->GetRequestID());
 795 }
 796
 797 void ResourceDispatcherHostImpl::OnInit() {
 798   scheduler_.reset(new ResourceScheduler);
 799   AppCacheInterceptor::EnsureRegistered();
 800 }
 801
 802 void ResourceDispatcherHostImpl::OnShutdown() {
 803   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 804
 805   is_shutdown_ = true;
 806   pending_loaders_.clear();
 807
 808   // Make sure we shutdown the timer now, otherwise by the time our destructor
 809   // runs if the timer is still running the Task is deleted twice (once by
 810   // the MessageLoop and the second time by RepeatingTimer).
 811   update_load_states_timer_.reset();
 812
 813   // Clear blocked requests if any left.
 814   // Note that we have to do this in 2 passes as we cannot call
 815   // CancelBlockedRequestsForRoute while iterating over
 816   // blocked_loaders_map_, as it modifies it.
 817   std::set<GlobalRoutingID> ids;
 818   for (BlockedLoadersMap::const_iterator iter = blocked_loaders_map_.begin();
 819        iter != blocked_loaders_map_.end(); ++iter) {
 820     std::pair<std::set<GlobalRoutingID>::iterator, bool> result =
 821         ids.insert(iter->first);
 822     // We should not have duplicates.
 823     DCHECK(result.second);
 824   }
 825   for (std::set<GlobalRoutingID>::const_iterator iter = ids.begin();
 826        iter != ids.end(); ++iter) {
 827     CancelBlockedRequestsForRoute(iter->child_id, iter->route_id);
 828   }
 829
 830   scheduler_.reset();
 831 }
 832
 833 bool ResourceDispatcherHostImpl::OnMessageReceived(
 834     const IPC::Message& message,
 835     ResourceMessageFilter* filter) {
 836   filter_ = filter;
 837   bool handled = true;
 838   IPC_BEGIN_MESSAGE_MAP(ResourceDispatcherHostImpl, message)
 839     IPC_MESSAGE_HANDLER(ResourceHostMsg_RequestResource, OnRequestResource)
 840     IPC_MESSAGE_HANDLER_DELAY_REPLY(ResourceHostMsg_SyncLoad, OnSyncLoad)
 841     IPC_MESSAGE_HANDLER(ResourceHostMsg_ReleaseDownloadedFile,
 842                         OnReleaseDownloadedFile)
 843     IPC_MESSAGE_HANDLER(ResourceHostMsg_DataDownloaded_ACK, OnDataDownloadedACK)
 844     IPC_MESSAGE_HANDLER(ResourceHostMsg_UploadProgress_ACK, OnUploadProgressACK)
 845     IPC_MESSAGE_HANDLER(ResourceHostMsg_CancelRequest, OnCancelRequest)
 846     IPC_MESSAGE_UNHANDLED(handled = false)
 847   IPC_END_MESSAGE_MAP()
 848
 849   if (!handled && IPC_MESSAGE_ID_CLASS(message.type()) == ResourceMsgStart) {
 850     PickleIterator iter(message);
 851     int request_id = -1;
 852     bool ok = iter.ReadInt(&request_id);
 853     DCHECK(ok);
 854     GlobalRequestID id(filter_->child_id(), request_id);
 855     DelegateMap::iterator it = delegate_map_.find(id);
 856     if (it != delegate_map_.end()) {
 857       ObserverList<ResourceMessageDelegate>::Iterator del_it(*it->second);
 858       ResourceMessageDelegate* delegate;
 859       while (!handled && (delegate = del_it.GetNext()) != NULL) {
 860         handled = delegate->OnMessageReceived(message);
 861       }
 862     }
 863
 864     // As the unhandled resource message effectively has no consumer, mark it as
 865     // handled to prevent needless propagation through the filter pipeline.
 866     handled = true;
 867   }
 868
 869   filter_ = NULL;
 870   return handled;
 871 }
 872
 873 void ResourceDispatcherHostImpl::OnRequestResource(
 874     int routing_id,
 875     int request_id,
 876     const ResourceHostMsg_Request& request_data) {
 877   BeginRequest(request_id, request_data, NULL, routing_id);
 878 }
 879
 880 // Begins a resource request with the given params on behalf of the specified
 881 // child process.  Responses will be dispatched through the given receiver. The
 882 // process ID is used to lookup WebContentsImpl from routing_id's in the case of
 883 // a request from a renderer.  request_context is the cookie/cache context to be
 884 // used for this request.
 885 //
 886 // If sync_result is non-null, then a SyncLoad reply will be generated, else
 887 // a normal asynchronous set of response messages will be generated.
 888 void ResourceDispatcherHostImpl::OnSyncLoad(
 889     int request_id,
 890     const ResourceHostMsg_Request& request_data,
 891     IPC::Message* sync_result) {
 892   BeginRequest(request_id, request_data, sync_result,
 893                sync_result->routing_id());
 894 }
 895
 896 void ResourceDispatcherHostImpl::UpdateRequestForTransfer(
 897     int child_id,
 898     int route_id,
 899     int request_id,
 900     const ResourceHostMsg_Request& request_data,
 901     const linked_ptr<ResourceLoader>& loader) {
 902   ResourceRequestInfoImpl* info = loader->GetRequestInfo();
 903   GlobalRoutingID old_routing_id(
 904       request_data.transferred_request_child_id, info->GetRouteID());
 905   GlobalRequestID old_request_id(request_data.transferred_request_child_id,
 906                                  request_data.transferred_request_request_id);
 907   GlobalRoutingID new_routing_id(child_id, route_id);
 908   GlobalRequestID new_request_id(child_id, request_id);
 909
 910   // Clear out data that depends on |info| before updating it.
 911   IncrementOutstandingRequestsMemory(-1, *info);
 912   OustandingRequestsStats empty_stats = { 0, 0 };
 913   OustandingRequestsStats old_stats = GetOutstandingRequestsStats(*info);
 914   UpdateOutstandingRequestsStats(*info, empty_stats);
 915   pending_loaders_.erase(old_request_id);
 916
 917   // ResourceHandlers should always get state related to the request from the
 918   // ResourceRequestInfo rather than caching it locally.  This lets us update
 919   // the info object when a transfer occurs.
 920   info->UpdateForTransfer(child_id, route_id, request_data.origin_pid,
 921                           request_id, request_data.parent_render_frame_id,
 922                           filter_->GetWeakPtr());
 923
 924   // Update maps that used the old IDs, if necessary.  Some transfers in tests
 925   // do not actually use a different ID, so not all maps need to be updated.
 926   pending_loaders_[new_request_id] = loader;
 927   UpdateOutstandingRequestsStats(*info, old_stats);
 928   IncrementOutstandingRequestsMemory(1, *info);
 929   if (old_routing_id != new_routing_id) {
 930     if (blocked_loaders_map_.find(old_routing_id) !=
 931             blocked_loaders_map_.end()) {
 932       blocked_loaders_map_[new_routing_id] =
 933           blocked_loaders_map_[old_routing_id];
 934       blocked_loaders_map_.erase(old_routing_id);
 935     }
 936   }
 937   if (old_request_id != new_request_id) {
 938     DelegateMap::iterator it = delegate_map_.find(old_request_id);
 939     if (it != delegate_map_.end()) {
 940       // Tell each delegate that the request ID has changed.
 941       ObserverList<ResourceMessageDelegate>::Iterator del_it(*it->second);
 942       ResourceMessageDelegate* delegate;
 943       while ((delegate = del_it.GetNext()) != NULL) {
 944         delegate->set_request_id(new_request_id);
 945       }
 946       // Now store the observer list under the new request ID.
 947       delegate_map_[new_request_id] = delegate_map_[old_request_id];
 948       delegate_map_.erase(old_request_id);
 949     }
 950   }
 951
 952   AppCacheInterceptor::CompleteCrossSiteTransfer(
 953       loader->request(),
 954       child_id,
 955       request_data.appcache_host_id);
 956
 957   // We should have a CrossSiteResourceHandler to finish the transfer.
 958   DCHECK(info->cross_site_handler());
 959 }
 960
 961 void ResourceDispatcherHostImpl::BeginRequest(
 962     int request_id,
 963     const ResourceHostMsg_Request& request_data,
 964     IPC::Message* sync_result,  // only valid for sync
 965     int route_id) {
 966   int process_type = filter_->process_type();
 967   int child_id = filter_->child_id();
 968
 969   // Reject invalid priority.
 970   if (request_data.priority < net::MINIMUM_PRIORITY ||
 971       request_data.priority > net::MAXIMUM_PRIORITY) {
 972     RecordAction(base::UserMetricsAction("BadMessageTerminate_RDH"));
 973     filter_->BadMessageReceived();
 974     return;
 975   }
 976
 977   // If we crash here, figure out what URL the renderer was requesting.
 978   // http://crbug.com/91398
 979   char url_buf[128];
 980   base::strlcpy(url_buf, request_data.url.spec().c_str(), arraysize(url_buf));
 981   base::debug::Alias(url_buf);
 982
 983   // If the request that's coming in is being transferred from another process,
 984   // we want to reuse and resume the old loader rather than start a new one.
 985   {
 986     LoaderMap::iterator it = pending_loaders_.find(
 987         GlobalRequestID(request_data.transferred_request_child_id,
 988                         request_data.transferred_request_request_id));
 989     if (it != pending_loaders_.end()) {
 990       // If the request is transferring to a new process, we can update our
 991       // state and let it resume with its existing ResourceHandlers.
 992       if (it->second->is_transferring()) {
 993         linked_ptr<ResourceLoader> deferred_loader = it->second;
 994         UpdateRequestForTransfer(child_id, route_id, request_id,
 995                                  request_data, deferred_loader);
 996
 997         deferred_loader->CompleteTransfer();
 998       } else {
 999         RecordAction(base::UserMetricsAction("BadMessageTerminate_RDH"));
1000         filter_->BadMessageReceived();
1001       }
1002       return;
1003     }
1004   }
1005
1006   ResourceContext* resource_context = NULL;
1007   net::URLRequestContext* request_context = NULL;
1008   filter_->GetContexts(request_data, &resource_context, &request_context);
1009   // http://crbug.com/90971
1010   CHECK(ContainsKey(active_resource_contexts_, resource_context));
1011
1012   if (is_shutdown_ ||
1013       !ShouldServiceRequest(process_type, child_id, request_data,
1014                             filter_->file_system_context())) {
1015     AbortRequestBeforeItStarts(filter_, sync_result, request_id);
1016     return;
1017   }
1018
1019   // Allow the observer to block/handle the request.
1020   if (delegate_ && !delegate_->ShouldBeginRequest(child_id,
1021                                                   route_id,
1022                                                   request_data.method,
1023                                                   request_data.url,
1024                                                   request_data.resource_type,
1025                                                   resource_context)) {
1026     AbortRequestBeforeItStarts(filter_, sync_result, request_id);
1027     return;
1028   }
1029
1030   bool is_sync_load = sync_result != NULL;
1031   int load_flags =
1032       BuildLoadFlagsForRequest(request_data, child_id, is_sync_load);
1033
1034   // Sync loads should have maximum priority and should be the only
1035   // requets that have the ignore limits flag set.
1036   if (is_sync_load) {
1037     DCHECK_EQ(request_data.priority, net::MAXIMUM_PRIORITY);
1038     DCHECK_NE(load_flags & net::LOAD_IGNORE_LIMITS, 0);
1039   } else {
1040     DCHECK_EQ(load_flags & net::LOAD_IGNORE_LIMITS, 0);
1041   }
1042
1043   // Construct the request.
1044   net::CookieStore* cookie_store =
1045       GetContentClient()->browser()->OverrideCookieStoreForRenderProcess(
1046           child_id);
1047   scoped_ptr<net::URLRequest> new_request;
1048   new_request = request_context->CreateRequest(
1049       request_data.url, request_data.priority, NULL, cookie_store);
1050
1051   new_request->set_method(request_data.method);
1052   new_request->set_first_party_for_cookies(
1053       request_data.first_party_for_cookies);
1054
1055   const Referrer referrer(request_data.referrer, request_data.referrer_policy);
1056   SetReferrerForRequest(new_request.get(), referrer);
1057
1058   net::HttpRequestHeaders headers;
1059   headers.AddHeadersFromString(request_data.headers);
1060   new_request->SetExtraRequestHeaders(headers);
1061
1062   new_request->SetLoadFlags(load_flags);
1063
1064   // Resolve elements from request_body and prepare upload data.
1065   if (request_data.request_body.get()) {
1066     new_request->set_upload(UploadDataStreamBuilder::Build(
1067         request_data.request_body.get(),
1068         GetBlobStorageContext(filter_),
1069         filter_->file_system_context(),
1070         BrowserThread::GetMessageLoopProxyForThread(BrowserThread::FILE)
1071             .get()));
1072   }
1073
1074   bool allow_download = request_data.allow_download &&
1075       ResourceType::IsFrame(request_data.resource_type);
1076
1077   // Make extra info and read footer (contains request ID).
1078   ResourceRequestInfoImpl* extra_info =
1079       new ResourceRequestInfoImpl(
1080           process_type,
1081           child_id,
1082           route_id,
1083           request_data.origin_pid,
1084           request_id,
1085           request_data.render_frame_id,
1086           request_data.is_main_frame,
1087           request_data.parent_is_main_frame,
1088           request_data.parent_render_frame_id,
1089           request_data.resource_type,
1090           request_data.transition_type,
1091           request_data.should_replace_current_entry,
1092           false,  // is download
1093           false,  // is stream
1094           allow_download,
1095           request_data.has_user_gesture,
1096           request_data.referrer_policy,
1097           request_data.visiblity_state,
1098           resource_context,
1099           filter_->GetWeakPtr(),
1100           !is_sync_load);
1101   // Request takes ownership.
1102   extra_info->AssociateWithRequest(new_request.get());
1103
1104   if (new_request->url().SchemeIs(url::kBlobScheme)) {
1105     // Hang on to a reference to ensure the blob is not released prior
1106     // to the job being started.
1107     webkit_blob::BlobProtocolHandler::SetRequestedBlobDataHandle(
1108         new_request.get(),
1109         filter_->blob_storage_context()->context()->
1110             GetBlobDataFromPublicURL(new_request->url()));
1111   }
1112
1113   // Initialize the service worker handler for the request.
1114   ServiceWorkerRequestHandler::InitializeHandler(
1115       new_request.get(),
1116       filter_->service_worker_context(),
1117       GetBlobStorageContext(filter_),
1118       child_id,
1119       request_data.service_worker_provider_id,
1120       request_data.resource_type);
1121
1122   // Have the appcache associate its extra info with the request.
1123   AppCacheInterceptor::SetExtraRequestInfo(
1124       new_request.get(), filter_->appcache_service(), child_id,
1125       request_data.appcache_host_id, request_data.resource_type);
1126
1127   scoped_ptr<ResourceHandler> handler(
1128        CreateResourceHandler(
1129            new_request.get(),
1130            request_data, sync_result, route_id, process_type, child_id,
1131            resource_context));
1132
1133   if (handler)
1134     BeginRequestInternal(new_request.Pass(), handler.Pass());
1135 }
1136
1137 scoped_ptr<ResourceHandler> ResourceDispatcherHostImpl::CreateResourceHandler(
1138     net::URLRequest* request,
1139     const ResourceHostMsg_Request& request_data,
1140     IPC::Message* sync_result,
1141     int route_id,
1142     int process_type,
1143     int child_id,
1144     ResourceContext* resource_context) {
1145   // Construct the IPC resource handler.
1146   scoped_ptr<ResourceHandler> handler;
1147   if (sync_result) {
1148     // download_to_file is not supported for synchronous requests.
1149     if (request_data.download_to_file) {
1150       RecordAction(base::UserMetricsAction("BadMessageTerminate_RDH"));
1151       filter_->BadMessageReceived();
1152       return scoped_ptr<ResourceHandler>();
1153     }
1154
1155     handler.reset(new SyncResourceHandler(request, sync_result, this));
1156   } else {
1157     handler.reset(new AsyncResourceHandler(request, this));
1158
1159     // The RedirectToFileResourceHandler depends on being next in the chain.
1160     if (request_data.download_to_file) {
1161       handler.reset(
1162           new RedirectToFileResourceHandler(handler.Pass(), request));
1163     }
1164   }
1165
1166   // Prefetches and <a ping> requests outlive their child process.
1167   if (!sync_result && IsDetachableResourceType(request_data.resource_type)) {
1168     handler.reset(new DetachableResourceHandler(
1169         request,
1170         base::TimeDelta::FromMilliseconds(kDefaultDetachableCancelDelayMs),
1171         handler.Pass()));
1172   }
1173
1174   // Install a CrossSiteResourceHandler for all main frame requests.  This will
1175   // let us check whether a transfer is required and pause for the unload
1176   // handler either if so or if a cross-process navigation is already under way.
1177   bool is_swappable_navigation =
1178       request_data.resource_type == ResourceType::MAIN_FRAME;
1179   // If we are using --site-per-process, install it for subframes as well.
1180   if (!is_swappable_navigation &&
1181       CommandLine::ForCurrentProcess()->HasSwitch(switches::kSitePerProcess)) {
1182     is_swappable_navigation =
1183         request_data.resource_type == ResourceType::SUB_FRAME;
1184   }
1185   if (is_swappable_navigation && process_type == PROCESS_TYPE_RENDERER)
1186     handler.reset(new CrossSiteResourceHandler(handler.Pass(), request));
1187
1188   // Insert a buffered event handler before the actual one.
1189   handler.reset(
1190       new BufferedResourceHandler(handler.Pass(), this, request));
1191
1192   ScopedVector<ResourceThrottle> throttles;
1193   if (delegate_) {
1194     delegate_->RequestBeginning(request,
1195                                 resource_context,
1196                                 filter_->appcache_service(),
1197                                 request_data.resource_type,
1198                                 child_id,
1199                                 route_id,
1200                                 &throttles);
1201   }
1202
1203   if (request->has_upload()) {
1204     // Block power save while uploading data.
1205     throttles.push_back(new PowerSaveBlockResourceThrottle());
1206   }
1207
1208   throttles.push_back(
1209       scheduler_->ScheduleRequest(child_id, route_id, request).release());
1210
1211   handler.reset(
1212       new ThrottlingResourceHandler(handler.Pass(), request, throttles.Pass()));
1213
1214   return handler.Pass();
1215 }
1216
1217 void ResourceDispatcherHostImpl::OnReleaseDownloadedFile(int request_id) {
1218   UnregisterDownloadedTempFile(filter_->child_id(), request_id);
1219 }
1220
1221 void ResourceDispatcherHostImpl::OnDataDownloadedACK(int request_id) {
1222   // TODO(michaeln): maybe throttle DataDownloaded messages
1223 }
1224
1225 void ResourceDispatcherHostImpl::RegisterDownloadedTempFile(
1226     int child_id, int request_id, const base::FilePath& file_path) {
1227   scoped_refptr<ShareableFileReference> reference =
1228       ShareableFileReference::Get(file_path);
1229   DCHECK(reference);
1230
1231   registered_temp_files_[child_id][request_id] = reference;
1232   ChildProcessSecurityPolicyImpl::GetInstance()->GrantReadFile(
1233       child_id, reference->path());
1234
1235   // When the temp file is deleted, revoke permissions that the renderer has
1236   // to that file. This covers an edge case where the file is deleted and then
1237   // the same name is re-used for some other purpose, we don't want the old
1238   // renderer to still have access to it.
1239   //
1240   // We do this when the file is deleted because the renderer can take a blob
1241   // reference to the temp file that outlives the url loaded that it was
1242   // loaded with to keep the file (and permissions) alive.
1243   reference->AddFinalReleaseCallback(
1244       base::Bind(&RemoveDownloadFileFromChildSecurityPolicy,
1245                  child_id));
1246 }
1247
1248 void ResourceDispatcherHostImpl::UnregisterDownloadedTempFile(
1249     int child_id, int request_id) {
1250   DeletableFilesMap& map = registered_temp_files_[child_id];
1251   DeletableFilesMap::iterator found = map.find(request_id);
1252   if (found == map.end())
1253     return;
1254
1255   map.erase(found);
1256
1257   // Note that we don't remove the security bits here. This will be done
1258   // when all file refs are deleted (see RegisterDownloadedTempFile).
1259 }
1260
1261 bool ResourceDispatcherHostImpl::Send(IPC::Message* message) {
1262   delete message;
1263   return false;
1264 }
1265
1266 void ResourceDispatcherHostImpl::OnUploadProgressACK(int request_id) {
1267   ResourceLoader* loader = GetLoader(filter_->child_id(), request_id);
1268   if (loader)
1269     loader->OnUploadProgressACK();
1270 }
1271
1272 // Note that this cancel is subtly different from the other
1273 // CancelRequest methods in this file, which also tear down the loader.
1274 void ResourceDispatcherHostImpl::OnCancelRequest(int request_id) {
1275   int child_id = filter_->child_id();
1276
1277   // When the old renderer dies, it sends a message to us to cancel its
1278   // requests.
1279   if (IsTransferredNavigation(GlobalRequestID(child_id, request_id)))
1280     return;
1281
1282   ResourceLoader* loader = GetLoader(child_id, request_id);
1283   if (!loader) {
1284     // We probably want to remove this warning eventually, but I wanted to be
1285     // able to notice when this happens during initial development since it
1286     // should be rare and may indicate a bug.
1287     DVLOG(1) << "Canceling a request that wasn't found";
1288     return;
1289   }
1290
1291   loader->CancelRequest(true);
1292 }
1293
1294 ResourceRequestInfoImpl* ResourceDispatcherHostImpl::CreateRequestInfo(
1295     int child_id,
1296     int route_id,
1297     bool download,
1298     ResourceContext* context) {
1299   return new ResourceRequestInfoImpl(
1300       PROCESS_TYPE_RENDERER,
1301       child_id,
1302       route_id,
1303       0,
1304       request_id_,
1305       MSG_ROUTING_NONE,  // render_frame_id
1306       false,     // is_main_frame
1307       false,     // parent_is_main_frame
1308       -1,        // parent_render_frame_id
1309       ResourceType::SUB_RESOURCE,
1310       PAGE_TRANSITION_LINK,
1311       false,     // should_replace_current_entry
1312       download,  // is_download
1313       false,     // is_stream
1314       download,  // allow_download
1315       false,     // has_user_gesture
1316       blink::WebReferrerPolicyDefault,
1317       blink::WebPageVisibilityStateVisible,
1318       context,
1319       base::WeakPtr<ResourceMessageFilter>(),  // filter
1320       true);     // is_async
1321 }
1322
1323 void ResourceDispatcherHostImpl::OnRenderViewHostCreated(
1324     int child_id,
1325     int route_id) {
1326   scheduler_->OnClientCreated(child_id, route_id);
1327 }
1328
1329 void ResourceDispatcherHostImpl::OnRenderViewHostDeleted(
1330     int child_id,
1331     int route_id) {
1332   scheduler_->OnClientDeleted(child_id, route_id);
1333   CancelRequestsForRoute(child_id, route_id);
1334 }
1335
1336 // This function is only used for saving feature.
1337 void ResourceDispatcherHostImpl::BeginSaveFile(
1338     const GURL& url,
1339     const Referrer& referrer,
1340     int child_id,
1341     int route_id,
1342     ResourceContext* context) {
1343   if (is_shutdown_)
1344     return;
1345
1346   // http://crbug.com/90971
1347   char url_buf[128];
1348   base::strlcpy(url_buf, url.spec().c_str(), arraysize(url_buf));
1349   base::debug::Alias(url_buf);
1350   CHECK(ContainsKey(active_resource_contexts_, context));
1351
1352   request_id_--;
1353
1354   const net::URLRequestContext* request_context = context->GetRequestContext();
1355   bool known_proto =
1356       request_context->job_factory()->IsHandledURL(url);
1357   if (!known_proto) {
1358     // Since any URLs which have non-standard scheme have been filtered
1359     // by save manager(see GURL::SchemeIsStandard). This situation
1360     // should not happen.
1361     NOTREACHED();
1362     return;
1363   }
1364
1365   net::CookieStore* cookie_store =
1366       GetContentClient()->browser()->OverrideCookieStoreForRenderProcess(
1367           child_id);
1368   scoped_ptr<net::URLRequest> request(
1369       request_context->CreateRequest(url, net::DEFAULT_PRIORITY, NULL,
1370                                      cookie_store));
1371
1372   request->set_method("GET");
1373   SetReferrerForRequest(request.get(), referrer);
1374
1375   // So far, for saving page, we need fetch content from cache, in the
1376   // future, maybe we can use a configuration to configure this behavior.
1377   request->SetLoadFlags(net::LOAD_PREFERRING_CACHE);
1378
1379   // Since we're just saving some resources we need, disallow downloading.
1380   ResourceRequestInfoImpl* extra_info =
1381       CreateRequestInfo(child_id, route_id, false, context);
1382   extra_info->AssociateWithRequest(request.get());  // Request takes ownership.
1383
1384   scoped_ptr<ResourceHandler> handler(
1385       new SaveFileResourceHandler(request.get(),
1386                                   child_id,
1387                                   route_id,
1388                                   url,
1389                                   save_file_manager_.get()));
1390
1391   BeginRequestInternal(request.Pass(), handler.Pass());
1392 }
1393
1394 void ResourceDispatcherHostImpl::MarkAsTransferredNavigation(
1395     const GlobalRequestID& id) {
1396   GetLoader(id)->MarkAsTransferring();
1397 }
1398
1399 void ResourceDispatcherHostImpl::CancelTransferringNavigation(
1400     const GlobalRequestID& id) {
1401   // Request should still exist and be in the middle of a transfer.
1402   DCHECK(IsTransferredNavigation(id));
1403   RemovePendingRequest(id.child_id, id.request_id);
1404 }
1405
1406 void ResourceDispatcherHostImpl::ResumeDeferredNavigation(
1407     const GlobalRequestID& id) {
1408   ResourceLoader* loader = GetLoader(id);
1409   if (loader) {
1410     // The response we were meant to resume could have already been canceled.
1411     ResourceRequestInfoImpl* info = loader->GetRequestInfo();
1412     if (info->cross_site_handler())
1413       info->cross_site_handler()->ResumeResponse();
1414   }
1415 }
1416
1417 // The object died, so cancel and detach all requests associated with it except
1418 // for downloads and detachable resources, which belong to the browser process
1419 // even if initiated via a renderer.
1420 void ResourceDispatcherHostImpl::CancelRequestsForProcess(int child_id) {
1421   CancelRequestsForRoute(child_id, -1 /* cancel all */);
1422   registered_temp_files_.erase(child_id);
1423 }
1424
1425 void ResourceDispatcherHostImpl::CancelRequestsForRoute(int child_id,
1426                                                         int route_id) {
1427   // Since pending_requests_ is a map, we first build up a list of all of the
1428   // matching requests to be cancelled, and then we cancel them.  Since there
1429   // may be more than one request to cancel, we cannot simply hold onto the map
1430   // iterators found in the first loop.
1431
1432   // Find the global ID of all matching elements.
1433   bool any_requests_transferring = false;
1434   std::vector<GlobalRequestID> matching_requests;
1435   for (LoaderMap::const_iterator i = pending_loaders_.begin();
1436        i != pending_loaders_.end(); ++i) {
1437     if (i->first.child_id != child_id)
1438       continue;
1439
1440     ResourceRequestInfoImpl* info = i->second->GetRequestInfo();
1441
1442     GlobalRequestID id(child_id, i->first.request_id);
1443     DCHECK(id == i->first);
1444     // Don't cancel navigations that are expected to live beyond this process.
1445     if (IsTransferredNavigation(id))
1446       any_requests_transferring = true;
1447     if (info->detachable_handler()) {
1448       info->detachable_handler()->Detach();
1449     } else if (!info->IsDownload() && !info->is_stream() &&
1450                !IsTransferredNavigation(id) &&
1451                (route_id == -1 || route_id == info->GetRouteID())) {
1452       matching_requests.push_back(id);
1453     }
1454   }
1455
1456   // Remove matches.
1457   for (size_t i = 0; i < matching_requests.size(); ++i) {
1458     LoaderMap::iterator iter = pending_loaders_.find(matching_requests[i]);
1459     // Although every matching request was in pending_requests_ when we built
1460     // matching_requests, it is normal for a matching request to be not found
1461     // in pending_requests_ after we have removed some matching requests from
1462     // pending_requests_.  For example, deleting a net::URLRequest that has
1463     // exclusive (write) access to an HTTP cache entry may unblock another
1464     // net::URLRequest that needs exclusive access to the same cache entry, and
1465     // that net::URLRequest may complete and remove itself from
1466     // pending_requests_. So we need to check that iter is not equal to
1467     // pending_requests_.end().
1468     if (iter != pending_loaders_.end())
1469       RemovePendingLoader(iter);
1470   }
1471
1472   // Don't clear the blocked loaders or offline policy maps if any of the
1473   // requests in route_id are being transferred to a new process, since those
1474   // maps will be updated with the new route_id after the transfer.  Otherwise
1475   // we will lose track of this info when the old route goes away, before the
1476   // new one is created.
1477   if (any_requests_transferring)
1478     return;
1479
1480   // Now deal with blocked requests if any.
1481   if (route_id != -1) {
1482     if (blocked_loaders_map_.find(GlobalRoutingID(child_id, route_id)) !=
1483         blocked_loaders_map_.end()) {
1484       CancelBlockedRequestsForRoute(child_id, route_id);
1485     }
1486   } else {
1487     // We have to do all render views for the process |child_id|.
1488     // Note that we have to do this in 2 passes as we cannot call
1489     // CancelBlockedRequestsForRoute while iterating over
1490     // blocked_loaders_map_, as it modifies it.
1491     std::set<int> route_ids;
1492     for (BlockedLoadersMap::const_iterator iter = blocked_loaders_map_.begin();
1493          iter != blocked_loaders_map_.end(); ++iter) {
1494       if (iter->first.child_id == child_id)
1495         route_ids.insert(iter->first.route_id);
1496     }
1497     for (std::set<int>::const_iterator iter = route_ids.begin();
1498         iter != route_ids.end(); ++iter) {
1499       CancelBlockedRequestsForRoute(child_id, *iter);
1500     }
1501   }
1502 }
1503
1504 // Cancels the request and removes it from the list.
1505 void ResourceDispatcherHostImpl::RemovePendingRequest(int child_id,
1506                                                       int request_id) {
1507   LoaderMap::iterator i = pending_loaders_.find(
1508       GlobalRequestID(child_id, request_id));
1509   if (i == pending_loaders_.end()) {
1510     NOTREACHED() << "Trying to remove a request that's not here";
1511     return;
1512   }
1513   RemovePendingLoader(i);
1514 }
1515
1516 void ResourceDispatcherHostImpl::RemovePendingLoader(
1517     const LoaderMap::iterator& iter) {
1518   ResourceRequestInfoImpl* info = iter->second->GetRequestInfo();
1519
1520   // Remove the memory credit that we added when pushing the request onto
1521   // the pending list.
1522   IncrementOutstandingRequestsMemory(-1, *info);
1523
1524   pending_loaders_.erase(iter);
1525
1526   // If we have no more pending requests, then stop the load state monitor
1527   if (pending_loaders_.empty() && update_load_states_timer_)
1528     update_load_states_timer_->Stop();
1529 }
1530
1531 void ResourceDispatcherHostImpl::CancelRequest(int child_id,
1532                                                int request_id) {
1533   ResourceLoader* loader = GetLoader(child_id, request_id);
1534   if (!loader) {
1535     // We probably want to remove this warning eventually, but I wanted to be
1536     // able to notice when this happens during initial development since it
1537     // should be rare and may indicate a bug.
1538     DVLOG(1) << "Canceling a request that wasn't found";
1539     return;
1540   }
1541
1542   RemovePendingRequest(child_id, request_id);
1543 }
1544
1545 ResourceDispatcherHostImpl::OustandingRequestsStats
1546 ResourceDispatcherHostImpl::GetOutstandingRequestsStats(
1547     const ResourceRequestInfoImpl& info) {
1548   OutstandingRequestsStatsMap::iterator entry =
1549       outstanding_requests_stats_map_.find(info.GetChildID());
1550   OustandingRequestsStats stats = { 0, 0 };
1551   if (entry != outstanding_requests_stats_map_.end())
1552     stats = entry->second;
1553   return stats;
1554 }
1555
1556 void ResourceDispatcherHostImpl::UpdateOutstandingRequestsStats(
1557     const ResourceRequestInfoImpl& info,
1558     const OustandingRequestsStats& stats) {
1559   if (stats.memory_cost == 0 && stats.num_requests == 0)
1560     outstanding_requests_stats_map_.erase(info.GetChildID());
1561   else
1562     outstanding_requests_stats_map_[info.GetChildID()] = stats;
1563 }
1564
1565 ResourceDispatcherHostImpl::OustandingRequestsStats
1566 ResourceDispatcherHostImpl::IncrementOutstandingRequestsMemory(
1567     int count,
1568     const ResourceRequestInfoImpl& info) {
1569   DCHECK_EQ(1, abs(count));
1570
1571   // Retrieve the previous value (defaulting to 0 if not found).
1572   OustandingRequestsStats stats = GetOutstandingRequestsStats(info);
1573
1574   // Insert/update the total; delete entries when their count reaches 0.
1575   stats.memory_cost += count * info.memory_cost();
1576   DCHECK_GE(stats.memory_cost, 0);
1577   UpdateOutstandingRequestsStats(info, stats);
1578
1579   return stats;
1580 }
1581
1582 ResourceDispatcherHostImpl::OustandingRequestsStats
1583 ResourceDispatcherHostImpl::IncrementOutstandingRequestsCount(
1584     int count,
1585     const ResourceRequestInfoImpl& info) {
1586   DCHECK_EQ(1, abs(count));
1587   num_in_flight_requests_ += count;
1588
1589   OustandingRequestsStats stats = GetOutstandingRequestsStats(info);
1590   stats.num_requests += count;
1591   DCHECK_GE(stats.num_requests, 0);
1592   UpdateOutstandingRequestsStats(info, stats);
1593
1594   return stats;
1595 }
1596
1597 bool ResourceDispatcherHostImpl::HasSufficientResourcesForRequest(
1598     const net::URLRequest* request_) {
1599   const ResourceRequestInfoImpl* info =
1600       ResourceRequestInfoImpl::ForRequest(request_);
1601   OustandingRequestsStats stats = IncrementOutstandingRequestsCount(1, *info);
1602
1603   if (stats.num_requests > max_num_in_flight_requests_per_process_)
1604     return false;
1605   if (num_in_flight_requests_ > max_num_in_flight_requests_)
1606     return false;
1607
1608   return true;
1609 }
1610
1611 void ResourceDispatcherHostImpl::FinishedWithResourcesForRequest(
1612     const net::URLRequest* request_) {
1613   const ResourceRequestInfoImpl* info =
1614       ResourceRequestInfoImpl::ForRequest(request_);
1615   IncrementOutstandingRequestsCount(-1, *info);
1616 }
1617
1618 void ResourceDispatcherHostImpl::NavigationRequest(
1619     const NavigationRequestInfo& info,
1620     scoped_refptr<ResourceRequestBody> request_body,
1621     int64 frame_node_id) {
1622   NOTIMPLEMENTED();
1623 }
1624
1625 // static
1626 int ResourceDispatcherHostImpl::CalculateApproximateMemoryCost(
1627     net::URLRequest* request) {
1628   // The following fields should be a minor size contribution (experimentally
1629   // on the order of 100). However since they are variable length, it could
1630   // in theory be a sizeable contribution.
1631   int strings_cost = request->extra_request_headers().ToString().size() +
1632                      request->original_url().spec().size() +
1633                      request->referrer().size() +
1634                      request->method().size();
1635
1636   // Note that this expression will typically be dominated by:
1637   // |kAvgBytesPerOutstandingRequest|.
1638   return kAvgBytesPerOutstandingRequest + strings_cost;
1639 }
1640
1641 void ResourceDispatcherHostImpl::BeginRequestInternal(
1642     scoped_ptr<net::URLRequest> request,
1643     scoped_ptr<ResourceHandler> handler) {
1644   DCHECK(!request->is_pending());
1645   ResourceRequestInfoImpl* info =
1646       ResourceRequestInfoImpl::ForRequest(request.get());
1647
1648   if ((TimeTicks::Now() - last_user_gesture_time_) <
1649       TimeDelta::FromMilliseconds(kUserGestureWindowMs)) {
1650     request->SetLoadFlags(
1651         request->load_flags() | net::LOAD_MAYBE_USER_GESTURE);
1652   }
1653
1654   // Add the memory estimate that starting this request will consume.
1655   info->set_memory_cost(CalculateApproximateMemoryCost(request.get()));
1656
1657   // If enqueing/starting this request will exceed our per-process memory
1658   // bound, abort it right away.
1659   OustandingRequestsStats stats = IncrementOutstandingRequestsMemory(1, *info);
1660   if (stats.memory_cost > max_outstanding_requests_cost_per_process_) {
1661     // We call "CancelWithError()" as a way of setting the net::URLRequest's
1662     // status -- it has no effect beyond this, since the request hasn't started.
1663     request->CancelWithError(net::ERR_INSUFFICIENT_RESOURCES);
1664
1665     bool defer = false;
1666     handler->OnResponseCompleted(request->status(), std::string(), &defer);
1667     if (defer) {
1668       // TODO(darin): The handler is not ready for us to kill the request. Oops!
1669       NOTREACHED();
1670     }
1671
1672     IncrementOutstandingRequestsMemory(-1, *info);
1673
1674     // A ResourceHandler must not outlive its associated URLRequest.
1675     handler.reset();
1676     return;
1677   }
1678
1679   linked_ptr<ResourceLoader> loader(
1680       new ResourceLoader(request.Pass(), handler.Pass(), this));
1681
1682   GlobalRoutingID id(info->GetGlobalRoutingID());
1683   BlockedLoadersMap::const_iterator iter = blocked_loaders_map_.find(id);
1684   if (iter != blocked_loaders_map_.end()) {
1685     // The request should be blocked.
1686     iter->second->push_back(loader);
1687     return;
1688   }
1689
1690   StartLoading(info, loader);
1691 }
1692
1693 void ResourceDispatcherHostImpl::StartLoading(
1694     ResourceRequestInfoImpl* info,
1695     const linked_ptr<ResourceLoader>& loader) {
1696   pending_loaders_[info->GetGlobalRequestID()] = loader;
1697
1698   loader->StartRequest();
1699 }
1700
1701 void ResourceDispatcherHostImpl::OnUserGesture(WebContentsImpl* contents) {
1702   last_user_gesture_time_ = TimeTicks::Now();
1703 }
1704
1705 net::URLRequest* ResourceDispatcherHostImpl::GetURLRequest(
1706     const GlobalRequestID& id) {
1707   ResourceLoader* loader = GetLoader(id);
1708   if (!loader)
1709     return NULL;
1710
1711   return loader->request();
1712 }
1713
1714 namespace {
1715
1716 // This function attempts to return the "more interesting" load state of |a|
1717 // and |b|.  We don't have temporal information about these load states
1718 // (meaning we don't know when we transitioned into these states), so we just
1719 // rank them according to how "interesting" the states are.
1720 //
1721 // We take advantage of the fact that the load states are an enumeration listed
1722 // in the order in which they occur during the lifetime of a request, so we can
1723 // regard states with larger numeric values as being further along toward
1724 // completion.  We regard those states as more interesting to report since they
1725 // represent progress.
1726 //
1727 // For example, by this measure "tranferring data" is a more interesting state
1728 // than "resolving host" because when we are transferring data we are actually
1729 // doing something that corresponds to changes that the user might observe,
1730 // whereas waiting for a host name to resolve implies being stuck.
1731 //
1732 const net::LoadStateWithParam& MoreInterestingLoadState(
1733     const net::LoadStateWithParam& a, const net::LoadStateWithParam& b) {
1734   return (a.state < b.state) ? b : a;
1735 }
1736
1737 // Carries information about a load state change.
1738 struct LoadInfo {
1739   GURL url;
1740   net::LoadStateWithParam load_state;
1741   uint64 upload_position;
1742   uint64 upload_size;
1743 };
1744
1745 // Map from ProcessID+RouteID pair to LoadState
1746 typedef std::map<GlobalRoutingID, LoadInfo> LoadInfoMap;
1747
1748 // Used to marshal calls to LoadStateChanged from the IO to UI threads.  We do
1749 // them all as a single callback to avoid spamming the UI thread.
1750 void LoadInfoUpdateCallback(const LoadInfoMap& info_map) {
1751   LoadInfoMap::const_iterator i;
1752   for (i = info_map.begin(); i != info_map.end(); ++i) {
1753     RenderViewHostImpl* view =
1754         RenderViewHostImpl::FromID(i->first.child_id, i->first.route_id);
1755     if (view)  // The view could be gone at this point.
1756       view->LoadStateChanged(i->second.url, i->second.load_state,
1757                              i->second.upload_position,
1758                              i->second.upload_size);
1759   }
1760 }
1761
1762 }  // namespace
1763
1764 void ResourceDispatcherHostImpl::UpdateLoadStates() {
1765   // Populate this map with load state changes, and then send them on to the UI
1766   // thread where they can be passed along to the respective RVHs.
1767   LoadInfoMap info_map;
1768
1769   LoaderMap::const_iterator i;
1770
1771   // Determine the largest upload size of all requests
1772   // in each View (good chance it's zero).
1773   std::map<GlobalRoutingID, uint64> largest_upload_size;
1774   for (i = pending_loaders_.begin(); i != pending_loaders_.end(); ++i) {
1775     net::URLRequest* request = i->second->request();
1776     ResourceRequestInfoImpl* info = i->second->GetRequestInfo();
1777     uint64 upload_size = request->GetUploadProgress().size();
1778     if (request->GetLoadState().state != net::LOAD_STATE_SENDING_REQUEST)
1779       upload_size = 0;
1780     GlobalRoutingID id(info->GetGlobalRoutingID());
1781     if (upload_size && largest_upload_size[id] < upload_size)
1782       largest_upload_size[id] = upload_size;
1783   }
1784
1785   for (i = pending_loaders_.begin(); i != pending_loaders_.end(); ++i) {
1786     net::URLRequest* request = i->second->request();
1787     ResourceRequestInfoImpl* info = i->second->GetRequestInfo();
1788     net::LoadStateWithParam load_state = request->GetLoadState();
1789     net::UploadProgress progress = request->GetUploadProgress();
1790
1791     // We also poll for upload progress on this timer and send upload
1792     // progress ipc messages to the plugin process.
1793     i->second->ReportUploadProgress();
1794
1795     GlobalRoutingID id(info->GetGlobalRoutingID());
1796
1797     // If a request is uploading data, ignore all other requests so that the
1798     // upload progress takes priority for being shown in the status bar.
1799     if (largest_upload_size.find(id) != largest_upload_size.end() &&
1800         progress.size() < largest_upload_size[id])
1801       continue;
1802
1803     net::LoadStateWithParam to_insert = load_state;
1804     LoadInfoMap::iterator existing = info_map.find(id);
1805     if (existing != info_map.end()) {
1806       to_insert =
1807           MoreInterestingLoadState(existing->second.load_state, load_state);
1808       if (to_insert.state == existing->second.load_state.state)
1809         continue;
1810     }
1811     LoadInfo& load_info = info_map[id];
1812     load_info.url = request->url();
1813     load_info.load_state = to_insert;
1814     load_info.upload_size = progress.size();
1815     load_info.upload_position = progress.position();
1816   }
1817
1818   if (info_map.empty())
1819     return;
1820
1821   BrowserThread::PostTask(
1822       BrowserThread::UI, FROM_HERE,
1823       base::Bind(&LoadInfoUpdateCallback, info_map));
1824 }
1825
1826 void ResourceDispatcherHostImpl::BlockRequestsForRoute(int child_id,
1827                                                        int route_id) {
1828   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
1829   GlobalRoutingID key(child_id, route_id);
1830   DCHECK(blocked_loaders_map_.find(key) == blocked_loaders_map_.end()) <<
1831       "BlockRequestsForRoute called  multiple time for the same RVH";
1832   blocked_loaders_map_[key] = new BlockedLoadersList();
1833 }
1834
1835 void ResourceDispatcherHostImpl::ResumeBlockedRequestsForRoute(int child_id,
1836                                                                int route_id) {
1837   ProcessBlockedRequestsForRoute(child_id, route_id, false);
1838 }
1839
1840 void ResourceDispatcherHostImpl::CancelBlockedRequestsForRoute(int child_id,
1841                                                                int route_id) {
1842   ProcessBlockedRequestsForRoute(child_id, route_id, true);
1843 }
1844
1845 void ResourceDispatcherHostImpl::ProcessBlockedRequestsForRoute(
1846     int child_id,
1847     int route_id,
1848     bool cancel_requests) {
1849   BlockedLoadersMap::iterator iter = blocked_loaders_map_.find(
1850       GlobalRoutingID(child_id, route_id));
1851   if (iter == blocked_loaders_map_.end()) {
1852     // It's possible to reach here if the renderer crashed while an interstitial
1853     // page was showing.
1854     return;
1855   }
1856
1857   BlockedLoadersList* loaders = iter->second;
1858
1859   // Removing the vector from the map unblocks any subsequent requests.
1860   blocked_loaders_map_.erase(iter);
1861
1862   for (BlockedLoadersList::iterator loaders_iter = loaders->begin();
1863        loaders_iter != loaders->end(); ++loaders_iter) {
1864     linked_ptr<ResourceLoader> loader = *loaders_iter;
1865     ResourceRequestInfoImpl* info = loader->GetRequestInfo();
1866     if (cancel_requests) {
1867       IncrementOutstandingRequestsMemory(-1, *info);
1868     } else {
1869       StartLoading(info, loader);
1870     }
1871   }
1872
1873   delete loaders;
1874 }
1875
1876 ResourceDispatcherHostImpl::HttpAuthRelationType
1877 ResourceDispatcherHostImpl::HttpAuthRelationTypeOf(
1878     const GURL& request_url,
1879     const GURL& first_party) {
1880   if (!first_party.is_valid())
1881     return HTTP_AUTH_RELATION_TOP;
1882
1883   if (net::registry_controlled_domains::SameDomainOrHost(
1884           first_party, request_url,
1885           net::registry_controlled_domains::INCLUDE_PRIVATE_REGISTRIES))
1886     return HTTP_AUTH_RELATION_SAME_DOMAIN;
1887
1888   if (allow_cross_origin_auth_prompt())
1889     return HTTP_AUTH_RELATION_ALLOWED_CROSS;
1890
1891   return HTTP_AUTH_RELATION_BLOCKED_CROSS;
1892 }
1893
1894 bool ResourceDispatcherHostImpl::allow_cross_origin_auth_prompt() {
1895   return allow_cross_origin_auth_prompt_;
1896 }
1897
1898 bool ResourceDispatcherHostImpl::IsTransferredNavigation(
1899     const GlobalRequestID& id) const {
1900   ResourceLoader* loader = GetLoader(id);
1901   return loader ? loader->is_transferring() : false;
1902 }
1903
1904 ResourceLoader* ResourceDispatcherHostImpl::GetLoader(
1905     const GlobalRequestID& id) const {
1906   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
1907
1908   LoaderMap::const_iterator i = pending_loaders_.find(id);
1909   if (i == pending_loaders_.end())
1910     return NULL;
1911
1912   return i->second.get();
1913 }
1914
1915 ResourceLoader* ResourceDispatcherHostImpl::GetLoader(int child_id,
1916                                                       int request_id) const {
1917   return GetLoader(GlobalRequestID(child_id, request_id));
1918 }
1919
1920 void ResourceDispatcherHostImpl::RegisterResourceMessageDelegate(
1921     const GlobalRequestID& id, ResourceMessageDelegate* delegate) {
1922   DelegateMap::iterator it = delegate_map_.find(id);
1923   if (it == delegate_map_.end()) {
1924     it = delegate_map_.insert(
1925         std::make_pair(id, new ObserverList<ResourceMessageDelegate>)).first;
1926   }
1927   it->second->AddObserver(delegate);
1928 }
1929
1930 void ResourceDispatcherHostImpl::UnregisterResourceMessageDelegate(
1931     const GlobalRequestID& id, ResourceMessageDelegate* delegate) {
1932   DCHECK(ContainsKey(delegate_map_, id));
1933   DelegateMap::iterator it = delegate_map_.find(id);
1934   DCHECK(it->second->HasObserver(delegate));
1935   it->second->RemoveObserver(delegate);
1936   if (!it->second->might_have_observers()) {
1937     delete it->second;
1938     delegate_map_.erase(it);
1939   }
1940 }
1941
1942 int ResourceDispatcherHostImpl::BuildLoadFlagsForRequest(
1943     const ResourceHostMsg_Request& request_data,
1944     int child_id,
1945     bool is_sync_load) {
1946   int load_flags = request_data.load_flags;
1947
1948   // Although EV status is irrelevant to sub-frames and sub-resources, we have
1949   // to perform EV certificate verification on all resources because an HTTP
1950   // keep-alive connection created to load a sub-frame or a sub-resource could
1951   // be reused to load a main frame.
1952   load_flags |= net::LOAD_VERIFY_EV_CERT;
1953   if (request_data.resource_type == ResourceType::MAIN_FRAME) {
1954     load_flags |= net::LOAD_MAIN_FRAME;
1955   } else if (request_data.resource_type == ResourceType::SUB_FRAME) {
1956     load_flags |= net::LOAD_SUB_FRAME;
1957   } else if (request_data.resource_type == ResourceType::PREFETCH) {
1958     load_flags |= (net::LOAD_PREFETCH | net::LOAD_DO_NOT_PROMPT_FOR_LOGIN);
1959   } else if (request_data.resource_type == ResourceType::FAVICON) {
1960     load_flags |= net::LOAD_DO_NOT_PROMPT_FOR_LOGIN;
1961   } else if (request_data.resource_type == ResourceType::IMAGE) {
1962     // Prevent third-party image content from prompting for login, as this
1963     // is often a scam to extract credentials for another domain from the user.
1964     // Only block image loads, as the attack applies largely to the "src"
1965     // property of the <img> tag. It is common for web properties to allow
1966     // untrusted values for <img src>; this is considered a fair thing for an
1967     // HTML sanitizer to do. Conversely, any HTML sanitizer that didn't
1968     // filter sources for <script>, <link>, <embed>, <object>, <iframe> tags
1969     // would be considered vulnerable in and of itself.
1970     HttpAuthRelationType relation_type = HttpAuthRelationTypeOf(
1971         request_data.url, request_data.first_party_for_cookies);
1972     if (relation_type == HTTP_AUTH_RELATION_BLOCKED_CROSS) {
1973       load_flags |= (net::LOAD_DO_NOT_USE_EMBEDDED_IDENTITY |
1974                      net::LOAD_DO_NOT_PROMPT_FOR_LOGIN);
1975     }
1976   }
1977
1978   if (is_sync_load)
1979     load_flags |= net::LOAD_IGNORE_LIMITS;
1980
1981   ChildProcessSecurityPolicyImpl* policy =
1982       ChildProcessSecurityPolicyImpl::GetInstance();
1983   if (!policy->CanSendCookiesForOrigin(child_id, request_data.url)) {
1984     load_flags |= (net::LOAD_DO_NOT_SEND_COOKIES |
1985                    net::LOAD_DO_NOT_SEND_AUTH_DATA |
1986                    net::LOAD_DO_NOT_SAVE_COOKIES);
1987   }
1988
1989   // Raw headers are sensitive, as they include Cookie/Set-Cookie, so only
1990   // allow requesting them if requester has ReadRawCookies permission.
1991   if ((load_flags & net::LOAD_REPORT_RAW_HEADERS)
1992       && !policy->CanReadRawCookies(child_id)) {
1993     VLOG(1) << "Denied unauthorized request for raw headers";
1994     load_flags &= ~net::LOAD_REPORT_RAW_HEADERS;
1995   }
1996
1997   // Add a flag to selectively bypass the data reduction proxy if the resource
1998   // type is not an image.
1999   if (request_data.resource_type != ResourceType::IMAGE)
2000     load_flags |= net::LOAD_BYPASS_DATA_REDUCTION_PROXY;
2001
2002   return load_flags;
2003 }
2004
2005 }  // namespace content