src/chrome/browser/net/chrome_network_delegate.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/net/chrome_network_delegate.h"
   6
   7 #include <stdlib.h>
   8
   9 #include <vector>
  10
  11 #include "base/base_paths.h"
  12 #include "base/debug/trace_event.h"
  13 #include "base/logging.h"
  14 #include "base/metrics/histogram.h"
  15 #include "base/path_service.h"
  16 #include "base/prefs/pref_member.h"
  17 #include "base/prefs/pref_service.h"
  18 #include "base/strings/string_number_conversions.h"
  19 #include "base/strings/string_split.h"
  20 #include "base/time/time.h"
  21 #include "chrome/browser/browser_process.h"
  22 #include "chrome/browser/content_settings/cookie_settings.h"
  23 #include "chrome/browser/content_settings/tab_specific_content_settings.h"
  24 #include "chrome/browser/custom_handlers/protocol_handler_registry.h"
  25 #include "chrome/browser/extensions/api/proxy/proxy_api.h"
  26 #include "chrome/browser/extensions/api/web_request/web_request_api.h"
  27 #include "chrome/browser/extensions/event_router_forwarder.h"
  28 #include "chrome/browser/google/google_util.h"
  29 #include "chrome/browser/net/client_hints.h"
  30 #include "chrome/browser/net/connect_interceptor.h"
  31 #include "chrome/browser/performance_monitor/performance_monitor.h"
  32 #include "chrome/browser/profiles/profile_manager.h"
  33 #include "chrome/browser/task_manager/task_manager.h"
  34 #include "chrome/common/pref_names.h"
  35 #include "chrome/common/url_constants.h"
  36 #include "components/data_reduction_proxy/browser/data_reduction_proxy_metrics.h"
  37 #include "components/domain_reliability/monitor.h"
  38 #include "content/public/browser/browser_thread.h"
  39 #include "content/public/browser/render_frame_host.h"
  40 #include "content/public/browser/render_view_host.h"
  41 #include "content/public/browser/resource_request_info.h"
  42 #include "extensions/browser/extension_system.h"
  43 #include "extensions/browser/info_map.h"
  44 #include "extensions/browser/process_manager.h"
  45 #include "extensions/common/constants.h"
  46 #include "net/base/host_port_pair.h"
  47 #include "net/base/net_errors.h"
  48 #include "net/base/net_log.h"
  49 #include "net/cookies/canonical_cookie.h"
  50 #include "net/cookies/cookie_options.h"
  51 #include "net/http/http_request_headers.h"
  52 #include "net/http/http_response_headers.h"
  53 #include "net/socket_stream/socket_stream.h"
  54 #include "net/url_request/url_request.h"
  55
  56 #if defined(OS_CHROMEOS)
  57 #include "base/command_line.h"
  58 #include "base/sys_info.h"
  59 #include "chrome/common/chrome_switches.h"
  60 #endif
  61
  62 #if defined(ENABLE_CONFIGURATION_POLICY)
  63 #include "components/policy/core/browser/url_blacklist_manager.h"
  64 #endif
  65
  66 #if defined(OS_ANDROID)
  67 #include "chrome/browser/io_thread.h"
  68 #include "components/precache/content/precache_manager.h"
  69 #include "components/precache/content/precache_manager_factory.h"
  70 #endif
  71
  72 using content::BrowserThread;
  73 using content::RenderViewHost;
  74 using content::ResourceRequestInfo;
  75
  76 // By default we don't allow access to all file:// urls on ChromeOS and
  77 // Android.
  78 #if defined(OS_CHROMEOS) || defined(OS_ANDROID)
  79 bool ChromeNetworkDelegate::g_allow_file_access_ = false;
  80 #else
  81 bool ChromeNetworkDelegate::g_allow_file_access_ = true;
  82 #endif
  83
  84 // This remains false unless the --disable-extensions-http-throttling
  85 // flag is passed to the browser.
  86 bool ChromeNetworkDelegate::g_never_throttle_requests_ = false;
  87
  88 namespace {
  89
  90 const char kDNTHeader[] = "DNT";
  91
  92 // If the |request| failed due to problems with a proxy, forward the error to
  93 // the proxy extension API.
  94 void ForwardProxyErrors(net::URLRequest* request,
  95                         extensions::EventRouterForwarder* event_router,
  96                         void* profile) {
  97   if (request->status().status() == net::URLRequestStatus::FAILED) {
  98     switch (request->status().error()) {
  99       case net::ERR_PROXY_AUTH_UNSUPPORTED:
 100       case net::ERR_PROXY_CONNECTION_FAILED:
 101       case net::ERR_TUNNEL_CONNECTION_FAILED:
 102         extensions::ProxyEventRouter::GetInstance()->OnProxyError(
 103             event_router, profile, request->status().error());
 104     }
 105   }
 106 }
 107
 108 // Returns whether a URL parameter, |first_parameter| (e.g. foo=bar), has the
 109 // same key as the the |second_parameter| (e.g. foo=baz). Both parameters
 110 // must be in key=value form.
 111 bool HasSameParameterKey(const std::string& first_parameter,
 112                          const std::string& second_parameter) {
 113   DCHECK(second_parameter.find("=") != std::string::npos);
 114   // Prefix for "foo=bar" is "foo=".
 115   std::string parameter_prefix = second_parameter.substr(
 116       0, second_parameter.find("=") + 1);
 117   return StartsWithASCII(first_parameter, parameter_prefix, false);
 118 }
 119
 120 // Examines the query string containing parameters and adds the necessary ones
 121 // so that SafeSearch is active. |query| is the string to examine and the
 122 // return value is the |query| string modified such that SafeSearch is active.
 123 std::string AddSafeSearchParameters(const std::string& query) {
 124   std::vector<std::string> new_parameters;
 125   std::string safe_parameter = chrome::kSafeSearchSafeParameter;
 126   std::string ssui_parameter = chrome::kSafeSearchSsuiParameter;
 127
 128   std::vector<std::string> parameters;
 129   base::SplitString(query, '&', &parameters);
 130
 131   std::vector<std::string>::iterator it;
 132   for (it = parameters.begin(); it < parameters.end(); ++it) {
 133     if (!HasSameParameterKey(*it, safe_parameter) &&
 134         !HasSameParameterKey(*it, ssui_parameter)) {
 135       new_parameters.push_back(*it);
 136     }
 137   }
 138
 139   new_parameters.push_back(safe_parameter);
 140   new_parameters.push_back(ssui_parameter);
 141   return JoinString(new_parameters, '&');
 142 }
 143
 144 // If |request| is a request to Google Web Search the function
 145 // enforces that the SafeSearch query parameters are set to active.
 146 // Sets the query part of |new_url| with the new value of the parameters.
 147 void ForceGoogleSafeSearch(net::URLRequest* request,
 148                            GURL* new_url) {
 149   if (!google_util::IsGoogleSearchUrl(request->url()) &&
 150       !google_util::IsGoogleHomePageUrl(request->url()))
 151     return;
 152
 153   std::string query = request->url().query();
 154   std::string new_query = AddSafeSearchParameters(query);
 155   if (query == new_query)
 156     return;
 157
 158   GURL::Replacements replacements;
 159   replacements.SetQueryStr(new_query);
 160   *new_url = request->url().ReplaceComponents(replacements);
 161 }
 162
 163 // Gets called when the extensions finish work on the URL. If the extensions
 164 // did not do a redirect (so |new_url| is empty) then we enforce the
 165 // SafeSearch parameters. Otherwise we will get called again after the
 166 // redirect and we enforce SafeSearch then.
 167 void ForceGoogleSafeSearchCallbackWrapper(
 168     const net::CompletionCallback& callback,
 169     net::URLRequest* request,
 170     GURL* new_url,
 171     int rv) {
 172   if (rv == net::OK && new_url->is_empty())
 173     ForceGoogleSafeSearch(request, new_url);
 174   callback.Run(rv);
 175 }
 176
 177 enum RequestStatus { REQUEST_STARTED, REQUEST_DONE };
 178
 179 // Notifies the extensions::ProcessManager that a request has started or stopped
 180 // for a particular RenderFrame.
 181 void NotifyEPMRequestStatus(RequestStatus status,
 182                             void* profile_id,
 183                             int process_id,
 184                             int render_frame_id) {
 185   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 186   Profile* profile = reinterpret_cast<Profile*>(profile_id);
 187   if (!g_browser_process->profile_manager()->IsValidProfile(profile))
 188     return;
 189
 190   extensions::ProcessManager* process_manager =
 191       extensions::ExtensionSystem::Get(profile)->process_manager();
 192   // This may be NULL in unit tests.
 193   if (!process_manager)
 194     return;
 195
 196   // Will be NULL if the request was not issued on behalf of a renderer (e.g. a
 197   // system-level request).
 198   content::RenderFrameHost* render_frame_host =
 199       content::RenderFrameHost::FromID(process_id, render_frame_id);
 200   if (render_frame_host) {
 201     if (status == REQUEST_STARTED) {
 202       process_manager->OnNetworkRequestStarted(render_frame_host);
 203     } else if (status == REQUEST_DONE) {
 204       process_manager->OnNetworkRequestDone(render_frame_host);
 205     } else {
 206       NOTREACHED();
 207     }
 208   }
 209 }
 210
 211 void ForwardRequestStatus(
 212     RequestStatus status, net::URLRequest* request, void* profile_id) {
 213   const ResourceRequestInfo* info = ResourceRequestInfo::ForRequest(request);
 214   if (!info)
 215     return;
 216
 217   int process_id, render_frame_id;
 218   if (info->GetAssociatedRenderFrame(&process_id, &render_frame_id)) {
 219     BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
 220         base::Bind(&NotifyEPMRequestStatus,
 221                    status, profile_id, process_id, render_frame_id));
 222   }
 223 }
 224
 225 void UpdateContentLengthPrefs(
 226     int received_content_length,
 227     int original_content_length,
 228     data_reduction_proxy::DataReductionProxyRequestType request_type,
 229     Profile* profile) {
 230   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 231   DCHECK_GE(received_content_length, 0);
 232   DCHECK_GE(original_content_length, 0);
 233
 234   // Can be NULL in a unit test.
 235   if (!g_browser_process)
 236     return;
 237
 238   PrefService* prefs = g_browser_process->local_state();
 239   if (!prefs)
 240     return;
 241
 242   // Ignore off-the-record data.
 243   if (!g_browser_process->profile_manager()->IsValidProfile(profile) ||
 244       profile->IsOffTheRecord()) {
 245     return;
 246   }
 247 #if defined(OS_ANDROID)
 248   // If Android ever goes multi profile, the profile should be passed so that
 249   // the browser preference will be taken.
 250   bool with_data_reduction_proxy_enabled =
 251       ProfileManager::GetActiveUserProfile()->GetPrefs()->GetBoolean(
 252           data_reduction_proxy::prefs::kDataReductionProxyEnabled);
 253 #else
 254   bool with_data_reduction_proxy_enabled = false;
 255 #endif
 256
 257   data_reduction_proxy::UpdateContentLengthPrefs(received_content_length,
 258                                          original_content_length,
 259                                          with_data_reduction_proxy_enabled,
 260                                          request_type, prefs);
 261 }
 262
 263 void StoreAccumulatedContentLength(
 264     int received_content_length,
 265     int original_content_length,
 266     data_reduction_proxy::DataReductionProxyRequestType request_type,
 267     Profile* profile) {
 268   BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
 269       base::Bind(&UpdateContentLengthPrefs,
 270                  received_content_length, original_content_length,
 271                  request_type, profile));
 272 }
 273
 274 void RecordContentLengthHistograms(
 275     int64 received_content_length,
 276     int64 original_content_length,
 277     const base::TimeDelta& freshness_lifetime) {
 278   // Add the current resource to these histograms only when a valid
 279   // X-Original-Content-Length header is present.
 280   if (original_content_length >= 0) {
 281     UMA_HISTOGRAM_COUNTS("Net.HttpContentLengthWithValidOCL",
 282                          received_content_length);
 283     UMA_HISTOGRAM_COUNTS("Net.HttpOriginalContentLengthWithValidOCL",
 284                          original_content_length);
 285     UMA_HISTOGRAM_COUNTS("Net.HttpContentLengthDifferenceWithValidOCL",
 286                          original_content_length - received_content_length);
 287   } else {
 288     // Presume the original content length is the same as the received content
 289     // length if the X-Original-Content-Header is not present.
 290     original_content_length = received_content_length;
 291   }
 292   UMA_HISTOGRAM_COUNTS("Net.HttpContentLength", received_content_length);
 293   UMA_HISTOGRAM_COUNTS("Net.HttpOriginalContentLength",
 294                        original_content_length);
 295   UMA_HISTOGRAM_COUNTS("Net.HttpContentLengthDifference",
 296                        original_content_length - received_content_length);
 297   UMA_HISTOGRAM_CUSTOM_COUNTS("Net.HttpContentFreshnessLifetime",
 298                               freshness_lifetime.InSeconds(),
 299                               base::TimeDelta::FromHours(1).InSeconds(),
 300                               base::TimeDelta::FromDays(30).InSeconds(),
 301                               100);
 302   if (freshness_lifetime.InSeconds() <= 0)
 303     return;
 304   UMA_HISTOGRAM_COUNTS("Net.HttpContentLengthCacheable",
 305                        received_content_length);
 306   if (freshness_lifetime.InHours() < 4)
 307     return;
 308   UMA_HISTOGRAM_COUNTS("Net.HttpContentLengthCacheable4Hours",
 309                        received_content_length);
 310
 311   if (freshness_lifetime.InHours() < 24)
 312     return;
 313   UMA_HISTOGRAM_COUNTS("Net.HttpContentLengthCacheable24Hours",
 314                        received_content_length);
 315 }
 316
 317 #if defined(OS_ANDROID)
 318 void RecordPrecacheStatsOnUIThread(const GURL& url,
 319                                    const base::Time& fetch_time, int64 size,
 320                                    bool was_cached, void* profile_id) {
 321   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 322
 323   Profile* profile = reinterpret_cast<Profile*>(profile_id);
 324   if (!g_browser_process->profile_manager()->IsValidProfile(profile)) {
 325     return;
 326   }
 327
 328   precache::PrecacheManager* precache_manager =
 329       precache::PrecacheManagerFactory::GetForBrowserContext(profile);
 330   if (!precache_manager) {
 331     // This could be NULL if the profile is off the record.
 332     return;
 333   }
 334
 335   precache_manager->RecordStatsForFetch(url, fetch_time, size, was_cached);
 336 }
 337
 338 void RecordIOThreadToRequestStartOnUIThread(
 339     const base::TimeTicks& request_start) {
 340   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 341   base::TimeDelta request_lag = request_start -
 342       g_browser_process->io_thread()->creation_time();
 343   UMA_HISTOGRAM_TIMES("Net.IOThreadCreationToHTTPRequestStart", request_lag);
 344 }
 345 #endif  // defined(OS_ANDROID)
 346
 347 }  // namespace
 348
 349 ChromeNetworkDelegate::ChromeNetworkDelegate(
 350     extensions::EventRouterForwarder* event_router,
 351     BooleanPrefMember* enable_referrers)
 352     : event_router_(event_router),
 353       profile_(NULL),
 354       enable_referrers_(enable_referrers),
 355       enable_do_not_track_(NULL),
 356       force_google_safe_search_(NULL),
 357       url_blacklist_manager_(NULL),
 358       domain_reliability_monitor_(NULL),
 359       received_content_length_(0),
 360       original_content_length_(0),
 361       first_request_(true) {
 362   DCHECK(event_router);
 363   DCHECK(enable_referrers);
 364 }
 365
 366 ChromeNetworkDelegate::~ChromeNetworkDelegate() {}
 367
 368 void ChromeNetworkDelegate::set_extension_info_map(
 369     extensions::InfoMap* extension_info_map) {
 370   extension_info_map_ = extension_info_map;
 371 }
 372
 373 void ChromeNetworkDelegate::set_cookie_settings(
 374     CookieSettings* cookie_settings) {
 375   cookie_settings_ = cookie_settings;
 376 }
 377
 378 void ChromeNetworkDelegate::set_predictor(
 379     chrome_browser_net::Predictor* predictor) {
 380   connect_interceptor_.reset(
 381       new chrome_browser_net::ConnectInterceptor(predictor));
 382 }
 383
 384 void ChromeNetworkDelegate::SetEnableClientHints() {
 385   client_hints_.reset(new ClientHints());
 386   client_hints_->Init();
 387 }
 388
 389 // static
 390 void ChromeNetworkDelegate::NeverThrottleRequests() {
 391   g_never_throttle_requests_ = true;
 392 }
 393
 394 // static
 395 void ChromeNetworkDelegate::InitializePrefsOnUIThread(
 396     BooleanPrefMember* enable_referrers,
 397     BooleanPrefMember* enable_do_not_track,
 398     BooleanPrefMember* force_google_safe_search,
 399     PrefService* pref_service) {
 400   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 401   enable_referrers->Init(prefs::kEnableReferrers, pref_service);
 402   enable_referrers->MoveToThread(
 403       BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO));
 404   if (enable_do_not_track) {
 405     enable_do_not_track->Init(prefs::kEnableDoNotTrack, pref_service);
 406     enable_do_not_track->MoveToThread(
 407         BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO));
 408   }
 409   if (force_google_safe_search) {
 410     force_google_safe_search->Init(prefs::kForceSafeSearch, pref_service);
 411     force_google_safe_search->MoveToThread(
 412         BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO));
 413   }
 414 }
 415
 416 // static
 417 void ChromeNetworkDelegate::AllowAccessToAllFiles() {
 418   g_allow_file_access_ = true;
 419 }
 420
 421 // static
 422 base::Value* ChromeNetworkDelegate::HistoricNetworkStatsInfoToValue() {
 423   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 424   PrefService* prefs = g_browser_process->local_state();
 425   int64 total_received = prefs->GetInt64(
 426       data_reduction_proxy::prefs::kHttpReceivedContentLength);
 427   int64 total_original = prefs->GetInt64(
 428       data_reduction_proxy::prefs::kHttpOriginalContentLength);
 429
 430   base::DictionaryValue* dict = new base::DictionaryValue();
 431   // Use strings to avoid overflow.  base::Value only supports 32-bit integers.
 432   dict->SetString("historic_received_content_length",
 433                   base::Int64ToString(total_received));
 434   dict->SetString("historic_original_content_length",
 435                   base::Int64ToString(total_original));
 436   return dict;
 437 }
 438
 439 base::Value* ChromeNetworkDelegate::SessionNetworkStatsInfoToValue() const {
 440   base::DictionaryValue* dict = new base::DictionaryValue();
 441   // Use strings to avoid overflow.  base::Value only supports 32-bit integers.
 442   dict->SetString("session_received_content_length",
 443                   base::Int64ToString(received_content_length_));
 444   dict->SetString("session_original_content_length",
 445                   base::Int64ToString(original_content_length_));
 446   return dict;
 447 }
 448
 449 int ChromeNetworkDelegate::OnBeforeURLRequest(
 450     net::URLRequest* request,
 451     const net::CompletionCallback& callback,
 452     GURL* new_url) {
 453 #if defined(OS_ANDROID)
 454   // This UMA tracks the time to the first user-initiated request start, so
 455   // only non-null profiles are considered.
 456   if (first_request_ && profile_) {
 457     bool record_timing = true;
 458 #if defined(DATA_REDUCTION_PROXY_PROBE_URL)
 459     record_timing = (request->url() != GURL(DATA_REDUCTION_PROXY_PROBE_URL));
 460 #endif
 461     if (record_timing) {
 462       first_request_ = false;
 463       net::LoadTimingInfo timing_info;
 464       request->GetLoadTimingInfo(&timing_info);
 465       BrowserThread::PostTask(
 466           BrowserThread::UI, FROM_HERE,
 467           base::Bind(&RecordIOThreadToRequestStartOnUIThread,
 468                      timing_info.request_start));
 469     }
 470   }
 471 #endif  // defined(OS_ANDROID)
 472
 473 #if defined(ENABLE_CONFIGURATION_POLICY)
 474   // TODO(joaodasilva): This prevents extensions from seeing URLs that are
 475   // blocked. However, an extension might redirect the request to another URL,
 476   // which is not blocked.
 477   int error = net::ERR_BLOCKED_BY_ADMINISTRATOR;
 478   if (url_blacklist_manager_ &&
 479       url_blacklist_manager_->IsRequestBlocked(*request, &error)) {
 480     // URL access blocked by policy.
 481     request->net_log().AddEvent(
 482         net::NetLog::TYPE_CHROME_POLICY_ABORTED_REQUEST,
 483         net::NetLog::StringCallback("url",
 484                                     &request->url().possibly_invalid_spec()));
 485     return error;
 486   }
 487 #endif
 488
 489   ForwardRequestStatus(REQUEST_STARTED, request, profile_);
 490
 491   if (!enable_referrers_->GetValue())
 492     request->SetReferrer(std::string());
 493   if (enable_do_not_track_ && enable_do_not_track_->GetValue())
 494     request->SetExtraRequestHeaderByName(kDNTHeader, "1", true /* override */);
 495
 496   if (client_hints_) {
 497     request->SetExtraRequestHeaderByName(
 498         ClientHints::kDevicePixelRatioHeader,
 499         client_hints_->GetDevicePixelRatioHeader(), true);
 500   }
 501
 502   bool force_safe_search = force_google_safe_search_ &&
 503                            force_google_safe_search_->GetValue();
 504
 505   net::CompletionCallback wrapped_callback = callback;
 506   if (force_safe_search) {
 507     wrapped_callback = base::Bind(&ForceGoogleSafeSearchCallbackWrapper,
 508                                   callback,
 509                                   base::Unretained(request),
 510                                   base::Unretained(new_url));
 511   }
 512
 513   int rv = ExtensionWebRequestEventRouter::GetInstance()->OnBeforeRequest(
 514       profile_, extension_info_map_.get(), request, wrapped_callback,
 515       new_url);
 516
 517   if (force_safe_search && rv == net::OK && new_url->is_empty())
 518     ForceGoogleSafeSearch(request, new_url);
 519
 520   if (connect_interceptor_)
 521     connect_interceptor_->WitnessURLRequest(request);
 522
 523   return rv;
 524 }
 525
 526 int ChromeNetworkDelegate::OnBeforeSendHeaders(
 527     net::URLRequest* request,
 528     const net::CompletionCallback& callback,
 529     net::HttpRequestHeaders* headers) {
 530   TRACE_EVENT_ASYNC_STEP_PAST0("net", "URLRequest", request, "SendRequest");
 531   return ExtensionWebRequestEventRouter::GetInstance()->OnBeforeSendHeaders(
 532       profile_, extension_info_map_.get(), request, callback, headers);
 533 }
 534
 535 void ChromeNetworkDelegate::OnSendHeaders(
 536     net::URLRequest* request,
 537     const net::HttpRequestHeaders& headers) {
 538   ExtensionWebRequestEventRouter::GetInstance()->OnSendHeaders(
 539       profile_, extension_info_map_.get(), request, headers);
 540 }
 541
 542 int ChromeNetworkDelegate::OnHeadersReceived(
 543     net::URLRequest* request,
 544     const net::CompletionCallback& callback,
 545     const net::HttpResponseHeaders* original_response_headers,
 546     scoped_refptr<net::HttpResponseHeaders>* override_response_headers,
 547     GURL* allowed_unsafe_redirect_url) {
 548   return ExtensionWebRequestEventRouter::GetInstance()->OnHeadersReceived(
 549       profile_,
 550       extension_info_map_.get(),
 551       request,
 552       callback,
 553       original_response_headers,
 554       override_response_headers,
 555       allowed_unsafe_redirect_url);
 556 }
 557
 558 void ChromeNetworkDelegate::OnBeforeRedirect(net::URLRequest* request,
 559                                              const GURL& new_location) {
 560   if (domain_reliability_monitor_)
 561     domain_reliability_monitor_->OnBeforeRedirect(request);
 562   ExtensionWebRequestEventRouter::GetInstance()->OnBeforeRedirect(
 563       profile_, extension_info_map_.get(), request, new_location);
 564 }
 565
 566
 567 void ChromeNetworkDelegate::OnResponseStarted(net::URLRequest* request) {
 568   TRACE_EVENT_ASYNC_STEP_PAST0("net", "URLRequest", request, "ResponseStarted");
 569   ExtensionWebRequestEventRouter::GetInstance()->OnResponseStarted(
 570       profile_, extension_info_map_.get(), request);
 571   ForwardProxyErrors(request, event_router_.get(), profile_);
 572 }
 573
 574 void ChromeNetworkDelegate::OnRawBytesRead(const net::URLRequest& request,
 575                                            int bytes_read) {
 576   TRACE_EVENT_ASYNC_STEP_PAST1("net", "URLRequest", &request, "DidRead",
 577                                "bytes_read", bytes_read);
 578   performance_monitor::PerformanceMonitor::GetInstance()->BytesReadOnIOThread(
 579       request, bytes_read);
 580
 581 #if defined(ENABLE_TASK_MANAGER)
 582   // This is not completely accurate, but as a first approximation ignore
 583   // requests that are served from the cache. See bug 330931 for more info.
 584   if (!request.was_cached())
 585     TaskManager::GetInstance()->model()->NotifyBytesRead(request, bytes_read);
 586 #endif  // defined(ENABLE_TASK_MANAGER)
 587 }
 588
 589 void ChromeNetworkDelegate::OnCompleted(net::URLRequest* request,
 590                                         bool started) {
 591   TRACE_EVENT_ASYNC_END0("net", "URLRequest", request);
 592   if (request->status().status() == net::URLRequestStatus::SUCCESS) {
 593     // For better accuracy, we use the actual bytes read instead of the length
 594     // specified with the Content-Length header, which may be inaccurate,
 595     // or missing, as is the case with chunked encoding.
 596     int64 received_content_length = request->received_response_content_length();
 597
 598 #if defined(OS_ANDROID)
 599     if (precache::PrecacheManager::IsPrecachingEnabled()) {
 600       // Record precache metrics when a fetch is completed successfully, if
 601       // precaching is enabled.
 602       BrowserThread::PostTask(
 603           BrowserThread::UI, FROM_HERE,
 604           base::Bind(&RecordPrecacheStatsOnUIThread, request->url(),
 605                      base::Time::Now(), received_content_length,
 606                      request->was_cached(), profile_));
 607     }
 608 #endif  // defined(OS_ANDROID)
 609
 610     // Only record for http or https urls.
 611     bool is_http = request->url().SchemeIs("http");
 612     bool is_https = request->url().SchemeIs("https");
 613
 614     if (!request->was_cached() &&         // Don't record cached content
 615         received_content_length &&        // Zero-byte responses aren't useful.
 616         (is_http || is_https)) {          // Only record for HTTP or HTTPS urls.
 617       int64 original_content_length =
 618           request->response_info().headers->GetInt64HeaderValue(
 619               "x-original-content-length");
 620       data_reduction_proxy::DataReductionProxyRequestType request_type =
 621           data_reduction_proxy::GetDataReductionProxyRequestType(request);
 622
 623       base::TimeDelta freshness_lifetime =
 624           request->response_info().headers->GetFreshnessLifetime(
 625               request->response_info().response_time);
 626       int64 adjusted_original_content_length =
 627           data_reduction_proxy::GetAdjustedOriginalContentLength(
 628               request_type, original_content_length,
 629               received_content_length);
 630       AccumulateContentLength(received_content_length,
 631                               adjusted_original_content_length,
 632                               request_type);
 633       RecordContentLengthHistograms(received_content_length,
 634                                     original_content_length,
 635                                     freshness_lifetime);
 636       DVLOG(2) << __FUNCTION__
 637           << " received content length: " << received_content_length
 638           << " original content length: " << original_content_length
 639           << " url: " << request->url();
 640     }
 641
 642     bool is_redirect = request->response_headers() &&
 643         net::HttpResponseHeaders::IsRedirectResponseCode(
 644             request->response_headers()->response_code());
 645     if (!is_redirect) {
 646       ExtensionWebRequestEventRouter::GetInstance()->OnCompleted(
 647           profile_, extension_info_map_.get(), request);
 648     }
 649   } else if (request->status().status() == net::URLRequestStatus::FAILED ||
 650              request->status().status() == net::URLRequestStatus::CANCELED) {
 651     ExtensionWebRequestEventRouter::GetInstance()->OnErrorOccurred(
 652             profile_, extension_info_map_.get(), request, started);
 653   } else {
 654     NOTREACHED();
 655   }
 656   if (domain_reliability_monitor_)
 657     domain_reliability_monitor_->OnCompleted(request, started);
 658   ForwardProxyErrors(request, event_router_.get(), profile_);
 659
 660   ForwardRequestStatus(REQUEST_DONE, request, profile_);
 661 }
 662
 663 void ChromeNetworkDelegate::OnURLRequestDestroyed(net::URLRequest* request) {
 664   ExtensionWebRequestEventRouter::GetInstance()->OnURLRequestDestroyed(
 665       profile_, request);
 666 }
 667
 668 void ChromeNetworkDelegate::OnPACScriptError(int line_number,
 669                                              const base::string16& error) {
 670   extensions::ProxyEventRouter::GetInstance()->OnPACScriptError(
 671       event_router_.get(), profile_, line_number, error);
 672 }
 673
 674 net::NetworkDelegate::AuthRequiredResponse
 675 ChromeNetworkDelegate::OnAuthRequired(
 676     net::URLRequest* request,
 677     const net::AuthChallengeInfo& auth_info,
 678     const AuthCallback& callback,
 679     net::AuthCredentials* credentials) {
 680   return ExtensionWebRequestEventRouter::GetInstance()->OnAuthRequired(
 681       profile_, extension_info_map_.get(), request, auth_info,
 682       callback, credentials);
 683 }
 684
 685 bool ChromeNetworkDelegate::OnCanGetCookies(
 686     const net::URLRequest& request,
 687     const net::CookieList& cookie_list) {
 688   // NULL during tests, or when we're running in the system context.
 689   if (!cookie_settings_.get())
 690     return true;
 691
 692   bool allow = cookie_settings_->IsReadingCookieAllowed(
 693       request.url(), request.first_party_for_cookies());
 694
 695   int render_process_id = -1;
 696   int render_frame_id = -1;
 697
 698   // |is_for_blocking_resource| indicates whether the cookies read were for a
 699   // blocking resource (eg script, css). It is only temporarily added for
 700   // diagnostic purposes, per bug 353678. Will be removed again once data
 701   // collection is finished.
 702   bool is_for_blocking_resource = false;
 703   const ResourceRequestInfo* info = ResourceRequestInfo::ForRequest(&request);
 704   if (info && ((!info->IsAsync()) ||
 705                info->GetResourceType() == ResourceType::STYLESHEET ||
 706                info->GetResourceType() == ResourceType::SCRIPT)) {
 707     is_for_blocking_resource = true;
 708   }
 709
 710   if (content::ResourceRequestInfo::GetRenderFrameForRequest(
 711           &request, &render_process_id, &render_frame_id)) {
 712     BrowserThread::PostTask(
 713         BrowserThread::UI, FROM_HERE,
 714         base::Bind(&TabSpecificContentSettings::CookiesRead,
 715                    render_process_id, render_frame_id,
 716                    request.url(), request.first_party_for_cookies(),
 717                    cookie_list, !allow, is_for_blocking_resource));
 718   }
 719
 720   return allow;
 721 }
 722
 723 bool ChromeNetworkDelegate::OnCanSetCookie(const net::URLRequest& request,
 724                                            const std::string& cookie_line,
 725                                            net::CookieOptions* options) {
 726   // NULL during tests, or when we're running in the system context.
 727   if (!cookie_settings_.get())
 728     return true;
 729
 730   bool allow = cookie_settings_->IsSettingCookieAllowed(
 731       request.url(), request.first_party_for_cookies());
 732
 733   int render_process_id = -1;
 734   int render_frame_id = -1;
 735   if (content::ResourceRequestInfo::GetRenderFrameForRequest(
 736           &request, &render_process_id, &render_frame_id)) {
 737     BrowserThread::PostTask(
 738         BrowserThread::UI, FROM_HERE,
 739         base::Bind(&TabSpecificContentSettings::CookieChanged,
 740                    render_process_id, render_frame_id,
 741                    request.url(), request.first_party_for_cookies(),
 742                    cookie_line, *options, !allow));
 743   }
 744
 745   return allow;
 746 }
 747
 748 bool ChromeNetworkDelegate::OnCanAccessFile(const net::URLRequest& request,
 749                                             const base::FilePath& path) const {
 750   if (g_allow_file_access_)
 751     return true;
 752
 753 #if !defined(OS_CHROMEOS) && !defined(OS_ANDROID)
 754   return true;
 755 #else
 756 #if defined(OS_CHROMEOS)
 757   // If we're running Chrome for ChromeOS on Linux, we want to allow file
 758   // access.
 759   if (!base::SysInfo::IsRunningOnChromeOS() ||
 760       CommandLine::ForCurrentProcess()->HasSwitch(switches::kTestType)) {
 761     return true;
 762   }
 763
 764   // Use a whitelist to only allow access to files residing in the list of
 765   // directories below.
 766   static const char* const kLocalAccessWhiteList[] = {
 767       "/home/chronos/user/Downloads",
 768       "/home/chronos/user/log",
 769       "/home/chronos/user/WebRTC Logs",
 770       "/media",
 771       "/opt/oem",
 772       "/usr/share/chromeos-assets",
 773       "/tmp",
 774       "/var/log",
 775   };
 776
 777   // The actual location of "/home/chronos/user/Downloads" is the Downloads
 778   // directory under the profile path ("/home/chronos/user' is a hard link to
 779   // current primary logged in profile.) For the support of multi-profile
 780   // sessions, we are switching to use explicit "$PROFILE_PATH/Downloads" path
 781   // and here whitelist such access.
 782   if (!profile_path_.empty()) {
 783     const base::FilePath downloads = profile_path_.AppendASCII("Downloads");
 784     if (downloads == path.StripTrailingSeparators() || downloads.IsParent(path))
 785       return true;
 786   }
 787 #elif defined(OS_ANDROID)
 788   // Access to files in external storage is allowed.
 789   base::FilePath external_storage_path;
 790   PathService::Get(base::DIR_ANDROID_EXTERNAL_STORAGE, &external_storage_path);
 791   if (external_storage_path.IsParent(path))
 792     return true;
 793
 794   // Whitelist of other allowed directories.
 795   static const char* const kLocalAccessWhiteList[] = {
 796       "/sdcard",
 797       "/mnt/sdcard",
 798   };
 799 #endif
 800
 801   for (size_t i = 0; i < arraysize(kLocalAccessWhiteList); ++i) {
 802     const base::FilePath white_listed_path(kLocalAccessWhiteList[i]);
 803     // base::FilePath::operator== should probably handle trailing separators.
 804     if (white_listed_path == path.StripTrailingSeparators() ||
 805         white_listed_path.IsParent(path)) {
 806       return true;
 807     }
 808   }
 809
 810   DVLOG(1) << "File access denied - " << path.value().c_str();
 811   return false;
 812 #endif  // !defined(OS_CHROMEOS) && !defined(OS_ANDROID)
 813 }
 814
 815 bool ChromeNetworkDelegate::OnCanThrottleRequest(
 816     const net::URLRequest& request) const {
 817   if (g_never_throttle_requests_) {
 818     return false;
 819   }
 820
 821   return request.first_party_for_cookies().scheme() ==
 822       extensions::kExtensionScheme;
 823 }
 824
 825 bool ChromeNetworkDelegate::OnCanEnablePrivacyMode(
 826     const GURL& url,
 827     const GURL& first_party_for_cookies) const {
 828   // NULL during tests, or when we're running in the system context.
 829   if (!cookie_settings_.get())
 830     return false;
 831
 832   bool reading_cookie_allowed = cookie_settings_->IsReadingCookieAllowed(
 833       url, first_party_for_cookies);
 834   bool setting_cookie_allowed = cookie_settings_->IsSettingCookieAllowed(
 835       url, first_party_for_cookies);
 836   bool privacy_mode = !(reading_cookie_allowed && setting_cookie_allowed);
 837   return privacy_mode;
 838 }
 839
 840 int ChromeNetworkDelegate::OnBeforeSocketStreamConnect(
 841     net::SocketStream* socket,
 842     const net::CompletionCallback& callback) {
 843 #if defined(ENABLE_CONFIGURATION_POLICY)
 844   if (url_blacklist_manager_ &&
 845       url_blacklist_manager_->IsURLBlocked(socket->url())) {
 846     // URL access blocked by policy.
 847     socket->net_log()->AddEvent(
 848         net::NetLog::TYPE_CHROME_POLICY_ABORTED_REQUEST,
 849         net::NetLog::StringCallback("url",
 850                                     &socket->url().possibly_invalid_spec()));
 851     return net::ERR_BLOCKED_BY_ADMINISTRATOR;
 852   }
 853 #endif
 854   return net::OK;
 855 }
 856
 857 void ChromeNetworkDelegate::AccumulateContentLength(
 858     int64 received_content_length,
 859     int64 original_content_length,
 860     data_reduction_proxy::DataReductionProxyRequestType request_type) {
 861   DCHECK_GE(received_content_length, 0);
 862   DCHECK_GE(original_content_length, 0);
 863   StoreAccumulatedContentLength(received_content_length,
 864                                 original_content_length,
 865                                 request_type,
 866                                 reinterpret_cast<Profile*>(profile_));
 867   received_content_length_ += received_content_length;
 868   original_content_length_ += original_content_length;
 869 }