src/chrome/browser/extensions/updater/extension_updater.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/extensions/updater/extension_updater.h"
   6
   7 #include <algorithm>
   8 #include <set>
   9
  10 #include "base/bind.h"
  11 #include "base/files/file_util.h"
  12 #include "base/logging.h"
  13 #include "base/metrics/histogram.h"
  14 #include "base/prefs/pref_service.h"
  15 #include "base/rand_util.h"
  16 #include "base/stl_util.h"
  17 #include "base/strings/string_number_conversions.h"
  18 #include "base/strings/string_split.h"
  19 #include "chrome/browser/chrome_notification_types.h"
  20 #include "chrome/browser/extensions/api/module/module.h"
  21 #include "chrome/browser/extensions/crx_installer.h"
  22 #include "chrome/browser/extensions/extension_service.h"
  23 #include "chrome/browser/extensions/pending_extension_manager.h"
  24 #include "chrome/browser/profiles/profile.h"
  25 #include "chrome/common/pref_names.h"
  26 #include "components/omaha_query_params/omaha_query_params.h"
  27 #include "content/public/browser/browser_thread.h"
  28 #include "content/public/browser/notification_details.h"
  29 #include "content/public/browser/notification_service.h"
  30 #include "content/public/browser/notification_source.h"
  31 #include "crypto/sha2.h"
  32 #include "extensions/browser/extension_prefs.h"
  33 #include "extensions/browser/extension_registry.h"
  34 #include "extensions/browser/pref_names.h"
  35 #include "extensions/common/constants.h"
  36 #include "extensions/common/extension.h"
  37 #include "extensions/common/extension_set.h"
  38 #include "extensions/common/manifest.h"
  39 #include "extensions/common/manifest_constants.h"
  40
  41 using base::RandDouble;
  42 using base::RandInt;
  43 using base::Time;
  44 using base::TimeDelta;
  45 using content::BrowserThread;
  46 using extensions::Extension;
  47 using extensions::ExtensionSet;
  48 using omaha_query_params::OmahaQueryParams;
  49
  50 typedef extensions::ExtensionDownloaderDelegate::Error Error;
  51 typedef extensions::ExtensionDownloaderDelegate::PingResult PingResult;
  52
  53 namespace {
  54
  55 // Wait at least 5 minutes after browser startup before we do any checks. If you
  56 // change this value, make sure to update comments where it is used.
  57 const int kStartupWaitSeconds = 60 * 5;
  58
  59 // For sanity checking on update frequency - enforced in release mode only.
  60 #if defined(NDEBUG)
  61 const int kMinUpdateFrequencySeconds = 30;
  62 #endif
  63 const int kMaxUpdateFrequencySeconds = 60 * 60 * 24 * 7;  // 7 days
  64
  65 // Require at least 5 seconds between consecutive non-succesful extension update
  66 // checks.
  67 const int kMinUpdateThrottleTime = 5;
  68
  69 // The installsource query parameter to use when forcing updates due to NaCl
  70 // arch mismatch.
  71 const char kWrongMultiCrxInstallSource[] = "wrong_multi_crx";
  72
  73 // When we've computed a days value, we want to make sure we don't send a
  74 // negative value (due to the system clock being set backwards, etc.), since -1
  75 // is a special sentinel value that means "never pinged", and other negative
  76 // values don't make sense.
  77 int SanitizeDays(int days) {
  78   if (days < 0)
  79     return 0;
  80   return days;
  81 }
  82
  83 // Calculates the value to use for the ping days parameter.
  84 int CalculatePingDays(const Time& last_ping_day) {
  85   int days = extensions::ManifestFetchData::kNeverPinged;
  86   if (!last_ping_day.is_null()) {
  87     days = SanitizeDays((Time::Now() - last_ping_day).InDays());
  88   }
  89   return days;
  90 }
  91
  92 int CalculateActivePingDays(const Time& last_active_ping_day,
  93                             bool hasActiveBit) {
  94   if (!hasActiveBit)
  95     return 0;
  96   if (last_active_ping_day.is_null())
  97     return extensions::ManifestFetchData::kNeverPinged;
  98   return SanitizeDays((Time::Now() - last_active_ping_day).InDays());
  99 }
 100
 101 void RespondWithForcedUpdates(
 102     const base::Callback<void(const std::set<std::string>&)>& callback,
 103     scoped_ptr<std::set<std::string> > forced_updates) {
 104   callback.Run(*forced_updates.get());
 105 }
 106
 107 void DetermineForcedUpdatesOnBlockingPool(
 108     scoped_ptr<std::vector<scoped_refptr<const Extension> > > extensions,
 109     const base::Callback<void(const std::set<std::string>&)>& callback) {
 110   scoped_ptr<std::set<std::string> > forced_updates(
 111       new std::set<std::string>());
 112   DCHECK(!BrowserThread::CurrentlyOn(BrowserThread::UI));
 113   for (std::vector<scoped_refptr<const Extension> >::const_iterator iter =
 114           extensions->begin();
 115        iter != extensions->end();
 116        ++iter) {
 117     scoped_refptr<const Extension> extension = *iter;
 118     base::FilePath platform_specific_path = extension->path().Append(
 119         extensions::kPlatformSpecificFolder);
 120     if (base::PathExists(platform_specific_path)) {
 121       bool force = true;
 122       const base::ListValue* platforms;
 123       if (extension->manifest()->GetList(extensions::manifest_keys::kPlatforms,
 124                                          &platforms)) {
 125         for (size_t i = 0; i < platforms->GetSize(); ++i) {
 126           const base::DictionaryValue* p;
 127           if (platforms->GetDictionary(i, &p)) {
 128             std::string nacl_arch;
 129             if (p->GetString(extensions::manifest_keys::kNaClArch,
 130                              &nacl_arch) &&
 131                 nacl_arch == OmahaQueryParams::GetNaclArch()) {
 132               std::string subpath;
 133               if (p->GetString(extensions::manifest_keys::kSubPackagePath,
 134                                &subpath)) {
 135                 // _platform_specific is part of the sub_package_path entry.
 136                 base::FilePath platform_specific_subpath =
 137                     extension->path().AppendASCII(subpath);
 138                 if (base::PathExists(platform_specific_subpath)) {
 139                   force = false;
 140                 }
 141               }
 142             }
 143           }
 144         }
 145       }
 146
 147       if (force)
 148         forced_updates->insert(extension->id());
 149    }
 150   }
 151   BrowserThread::PostTask(
 152       BrowserThread::UI,
 153       FROM_HERE,
 154       base::Bind(&RespondWithForcedUpdates,
 155                  callback,
 156                  base::Passed(&forced_updates)));
 157 }
 158
 159 void CollectExtensionsFromSet(
 160     const ExtensionSet& extensions,
 161     std::vector<scoped_refptr<const Extension> >* paths) {
 162   std::copy(extensions.begin(), extensions.end(), std::back_inserter(*paths));
 163 }
 164
 165 void DetermineForcedUpdates(
 166     content::BrowserContext* browser_context,
 167     const base::Callback<void(const std::set<std::string>&)>& callback) {
 168   scoped_ptr<std::vector<scoped_refptr<const Extension> > > extensions(
 169       new std::vector<scoped_refptr<const Extension> >());
 170   const extensions::ExtensionRegistry* registry =
 171       extensions::ExtensionRegistry::Get(browser_context);
 172   scoped_ptr<ExtensionSet> installed_extensions =
 173       registry->GenerateInstalledExtensionsSet();
 174   CollectExtensionsFromSet(*installed_extensions.get(), extensions.get());
 175   BrowserThread::PostBlockingPoolTask(
 176       FROM_HERE,
 177       base::Bind(&DetermineForcedUpdatesOnBlockingPool,
 178                  base::Passed(&extensions),
 179                  callback));
 180 }
 181
 182 }  // namespace
 183
 184 namespace extensions {
 185
 186 ExtensionUpdater::CheckParams::CheckParams()
 187     : install_immediately(false) {}
 188
 189 ExtensionUpdater::CheckParams::~CheckParams() {}
 190
 191 ExtensionUpdater::FetchedCRXFile::FetchedCRXFile(
 192     const std::string& i,
 193     const base::FilePath& p,
 194     bool file_ownership_passed,
 195     const std::set<int>& request_ids)
 196     : extension_id(i),
 197       path(p),
 198       file_ownership_passed(file_ownership_passed),
 199       request_ids(request_ids) {}
 200
 201 ExtensionUpdater::FetchedCRXFile::FetchedCRXFile()
 202     : path(), file_ownership_passed(true) {}
 203
 204 ExtensionUpdater::FetchedCRXFile::~FetchedCRXFile() {}
 205
 206 ExtensionUpdater::InProgressCheck::InProgressCheck()
 207     : install_immediately(false) {}
 208
 209 ExtensionUpdater::InProgressCheck::~InProgressCheck() {}
 210
 211 struct ExtensionUpdater::ThrottleInfo {
 212   ThrottleInfo()
 213       : in_progress(true),
 214         throttle_delay(kMinUpdateThrottleTime),
 215         check_start(Time::Now()) {}
 216
 217   bool in_progress;
 218   int throttle_delay;
 219   Time check_start;
 220 };
 221
 222 ExtensionUpdater::ExtensionUpdater(
 223     ExtensionServiceInterface* service,
 224     ExtensionPrefs* extension_prefs,
 225     PrefService* prefs,
 226     Profile* profile,
 227     int frequency_seconds,
 228     ExtensionCache* cache,
 229     const ExtensionDownloader::Factory& downloader_factory)
 230     : alive_(false),
 231       service_(service),
 232       downloader_factory_(downloader_factory),
 233       frequency_seconds_(frequency_seconds),
 234       will_check_soon_(false),
 235       extension_prefs_(extension_prefs),
 236       prefs_(prefs),
 237       profile_(profile),
 238       next_request_id_(0),
 239       extension_registry_observer_(this),
 240       crx_install_is_running_(false),
 241       extension_cache_(cache),
 242       weak_ptr_factory_(this) {
 243   DCHECK_GE(frequency_seconds_, 5);
 244   DCHECK_LE(frequency_seconds_, kMaxUpdateFrequencySeconds);
 245 #if defined(NDEBUG)
 246   // In Release mode we enforce that update checks don't happen too often.
 247   frequency_seconds_ = std::max(frequency_seconds_, kMinUpdateFrequencySeconds);
 248 #endif
 249   frequency_seconds_ = std::min(frequency_seconds_, kMaxUpdateFrequencySeconds);
 250
 251   extension_registry_observer_.Add(ExtensionRegistry::Get(profile));
 252 }
 253
 254 ExtensionUpdater::~ExtensionUpdater() {
 255   Stop();
 256 }
 257
 258 void ExtensionUpdater::EnsureDownloaderCreated() {
 259   if (!downloader_.get()) {
 260     downloader_ = downloader_factory_.Run(this);
 261   }
 262 }
 263
 264 // The overall goal here is to balance keeping clients up to date while
 265 // avoiding a thundering herd against update servers.
 266 TimeDelta ExtensionUpdater::DetermineFirstCheckDelay() {
 267   DCHECK(alive_);
 268   // If someone's testing with a quick frequency, just allow it.
 269   if (frequency_seconds_ < kStartupWaitSeconds)
 270     return TimeDelta::FromSeconds(frequency_seconds_);
 271
 272   // If we've never scheduled a check before, start at frequency_seconds_.
 273   if (!prefs_->HasPrefPath(pref_names::kNextUpdateCheck))
 274     return TimeDelta::FromSeconds(frequency_seconds_);
 275
 276   // If it's been a long time since our last actual check, we want to do one
 277   // relatively soon.
 278   Time now = Time::Now();
 279   Time last = Time::FromInternalValue(prefs_->GetInt64(
 280       pref_names::kLastUpdateCheck));
 281   int days = (now - last).InDays();
 282   if (days >= 30) {
 283     // Wait 5-10 minutes.
 284     return TimeDelta::FromSeconds(RandInt(kStartupWaitSeconds,
 285                                           kStartupWaitSeconds * 2));
 286   } else if (days >= 14) {
 287     // Wait 10-20 minutes.
 288     return TimeDelta::FromSeconds(RandInt(kStartupWaitSeconds * 2,
 289                                           kStartupWaitSeconds * 4));
 290   } else if (days >= 3) {
 291     // Wait 20-40 minutes.
 292     return TimeDelta::FromSeconds(RandInt(kStartupWaitSeconds * 4,
 293                                           kStartupWaitSeconds * 8));
 294   }
 295
 296   // Read the persisted next check time, and use that if it isn't too soon
 297   // or too late. Otherwise pick something random.
 298   Time saved_next = Time::FromInternalValue(prefs_->GetInt64(
 299       pref_names::kNextUpdateCheck));
 300   Time earliest = now + TimeDelta::FromSeconds(kStartupWaitSeconds);
 301   Time latest = now + TimeDelta::FromSeconds(frequency_seconds_);
 302   if (saved_next >= earliest && saved_next <= latest) {
 303     return saved_next - now;
 304   } else {
 305     return TimeDelta::FromSeconds(RandInt(kStartupWaitSeconds,
 306                                           frequency_seconds_));
 307   }
 308 }
 309
 310 void ExtensionUpdater::Start() {
 311   DCHECK(!alive_);
 312   // If these are NULL, then that means we've been called after Stop()
 313   // has been called.
 314   DCHECK(service_);
 315   DCHECK(extension_prefs_);
 316   DCHECK(prefs_);
 317   DCHECK(profile_);
 318   DCHECK(!weak_ptr_factory_.HasWeakPtrs());
 319   alive_ = true;
 320   // Make sure our prefs are registered, then schedule the first check.
 321   ScheduleNextCheck(DetermineFirstCheckDelay());
 322 }
 323
 324 void ExtensionUpdater::Stop() {
 325   weak_ptr_factory_.InvalidateWeakPtrs();
 326   alive_ = false;
 327   service_ = NULL;
 328   extension_prefs_ = NULL;
 329   prefs_ = NULL;
 330   profile_ = NULL;
 331   timer_.Stop();
 332   will_check_soon_ = false;
 333   downloader_.reset();
 334 }
 335
 336 void ExtensionUpdater::ScheduleNextCheck(const TimeDelta& target_delay) {
 337   DCHECK(alive_);
 338   DCHECK(!timer_.IsRunning());
 339   DCHECK(target_delay >= TimeDelta::FromSeconds(1));
 340
 341   // Add +/- 10% random jitter.
 342   double delay_ms = target_delay.InMillisecondsF();
 343   double jitter_factor = (RandDouble() * .2) - 0.1;
 344   delay_ms += delay_ms * jitter_factor;
 345   TimeDelta actual_delay = TimeDelta::FromMilliseconds(
 346       static_cast<int64>(delay_ms));
 347
 348   // Save the time of next check.
 349   Time next = Time::Now() + actual_delay;
 350   prefs_->SetInt64(pref_names::kNextUpdateCheck, next.ToInternalValue());
 351
 352   timer_.Start(FROM_HERE, actual_delay, this, &ExtensionUpdater::TimerFired);
 353 }
 354
 355 void ExtensionUpdater::TimerFired() {
 356   DCHECK(alive_);
 357   CheckNow(default_params_);
 358
 359   // If the user has overridden the update frequency, don't bother reporting
 360   // this.
 361   if (frequency_seconds_ == extensions::kDefaultUpdateFrequencySeconds) {
 362     Time last = Time::FromInternalValue(prefs_->GetInt64(
 363         pref_names::kLastUpdateCheck));
 364     if (last.ToInternalValue() != 0) {
 365       // Use counts rather than time so we can use minutes rather than millis.
 366       UMA_HISTOGRAM_CUSTOM_COUNTS("Extensions.UpdateCheckGap",
 367           (Time::Now() - last).InMinutes(),
 368           TimeDelta::FromSeconds(kStartupWaitSeconds).InMinutes(),
 369           TimeDelta::FromDays(40).InMinutes(),
 370           50);  // 50 buckets seems to be the default.
 371     }
 372   }
 373
 374   // Save the last check time, and schedule the next check.
 375   int64 now = Time::Now().ToInternalValue();
 376   prefs_->SetInt64(pref_names::kLastUpdateCheck, now);
 377   ScheduleNextCheck(TimeDelta::FromSeconds(frequency_seconds_));
 378 }
 379
 380 void ExtensionUpdater::CheckSoon() {
 381   DCHECK(alive_);
 382   if (will_check_soon_)
 383     return;
 384   if (BrowserThread::PostTask(
 385           BrowserThread::UI, FROM_HERE,
 386           base::Bind(&ExtensionUpdater::DoCheckSoon,
 387                      weak_ptr_factory_.GetWeakPtr()))) {
 388     will_check_soon_ = true;
 389   } else {
 390     NOTREACHED();
 391   }
 392 }
 393
 394 bool ExtensionUpdater::WillCheckSoon() const {
 395   return will_check_soon_;
 396 }
 397
 398 void ExtensionUpdater::DoCheckSoon() {
 399   DCHECK(will_check_soon_);
 400   CheckNow(default_params_);
 401   will_check_soon_ = false;
 402 }
 403
 404 void ExtensionUpdater::AddToDownloader(
 405     const ExtensionSet* extensions,
 406     const std::list<std::string>& pending_ids,
 407     int request_id) {
 408   InProgressCheck& request = requests_in_progress_[request_id];
 409   for (ExtensionSet::const_iterator extension_iter = extensions->begin();
 410        extension_iter != extensions->end(); ++extension_iter) {
 411     const Extension& extension = *extension_iter->get();
 412     if (!Manifest::IsAutoUpdateableLocation(extension.location())) {
 413       VLOG(2) << "Extension " << extension.id() << " is not auto updateable";
 414       continue;
 415     }
 416     // An extension might be overwritten by policy, and have its update url
 417     // changed. Make sure existing extensions aren't fetched again, if a
 418     // pending fetch for an extension with the same id already exists.
 419     std::list<std::string>::const_iterator pending_id_iter = std::find(
 420         pending_ids.begin(), pending_ids.end(), extension.id());
 421     if (pending_id_iter == pending_ids.end()) {
 422       if (downloader_->AddExtension(extension, request_id))
 423         request.in_progress_ids_.push_back(extension.id());
 424     }
 425   }
 426 }
 427
 428 void ExtensionUpdater::CheckNow(const CheckParams& params) {
 429   DetermineForcedUpdates(
 430       profile_,
 431       base::Bind(&ExtensionUpdater::OnForcedUpdatesDetermined,
 432                  weak_ptr_factory_.GetWeakPtr(),
 433                  params));
 434 }
 435
 436 void ExtensionUpdater::OnForcedUpdatesDetermined(
 437     const CheckParams& params,
 438     const std::set<std::string>& forced_updates) {
 439   int request_id = next_request_id_++;
 440
 441   VLOG(2) << "Starting update check " << request_id;
 442   if (params.ids.empty())
 443     NotifyStarted();
 444
 445   DCHECK(alive_);
 446
 447   InProgressCheck& request = requests_in_progress_[request_id];
 448   request.callback = params.callback;
 449   request.install_immediately = params.install_immediately;
 450
 451   EnsureDownloaderCreated();
 452
 453   forced_updates_ = forced_updates;
 454
 455   // Add fetch records for extensions that should be fetched by an update URL.
 456   // These extensions are not yet installed. They come from group policy
 457   // and external install sources.
 458   const PendingExtensionManager* pending_extension_manager =
 459       service_->pending_extension_manager();
 460
 461   std::list<std::string> pending_ids;
 462
 463   if (params.ids.empty()) {
 464     // If no extension ids are specified, check for updates for all extensions.
 465     pending_extension_manager->GetPendingIdsForUpdateCheck(&pending_ids);
 466
 467     std::list<std::string>::const_iterator iter;
 468     for (iter = pending_ids.begin(); iter != pending_ids.end(); ++iter) {
 469       const PendingExtensionInfo* info = pending_extension_manager->GetById(
 470           *iter);
 471       if (!Manifest::IsAutoUpdateableLocation(info->install_source())) {
 472         VLOG(2) << "Extension " << *iter << " is not auto updateable";
 473         continue;
 474       }
 475       if (downloader_->AddPendingExtension(*iter, info->update_url(),
 476                                            request_id))
 477         request.in_progress_ids_.push_back(*iter);
 478     }
 479
 480     ExtensionRegistry* registry = ExtensionRegistry::Get(profile_);
 481     AddToDownloader(&registry->enabled_extensions(), pending_ids, request_id);
 482     AddToDownloader(&registry->disabled_extensions(), pending_ids, request_id);
 483   } else {
 484     for (std::list<std::string>::const_iterator it = params.ids.begin();
 485          it != params.ids.end(); ++it) {
 486       const Extension* extension = service_->GetExtensionById(*it, true);
 487       DCHECK(extension);
 488       if (downloader_->AddExtension(*extension, request_id))
 489         request.in_progress_ids_.push_back(extension->id());
 490     }
 491   }
 492
 493   // StartAllPending() might call OnExtensionDownloadFailed/Finished before
 494   // it returns, which would cause NotifyIfFinished to incorrectly try to
 495   // send out a notification. So check before we call StartAllPending if any
 496   // extensions are going to be updated, and use that to figure out if
 497   // NotifyIfFinished should be called.
 498   bool noChecks = request.in_progress_ids_.empty();
 499
 500   // StartAllPending() will call OnExtensionDownloadFailed or
 501   // OnExtensionDownloadFinished for each extension that was checked.
 502   downloader_->StartAllPending(extension_cache_);
 503
 504   if (noChecks)
 505     NotifyIfFinished(request_id);
 506 }
 507
 508 bool ExtensionUpdater::CheckExtensionSoon(const std::string& extension_id,
 509                                           const FinishedCallback& callback) {
 510   bool have_throttle_info = ContainsKey(throttle_info_, extension_id);
 511   ThrottleInfo& info = throttle_info_[extension_id];
 512   if (have_throttle_info) {
 513     // We already had a ThrottleInfo object for this extension, check if the
 514     // update check request should be allowed.
 515
 516     // If another check is in progress, don't start a new check.
 517     if (info.in_progress)
 518       return false;
 519
 520     Time now = Time::Now();
 521     Time last = info.check_start;
 522     // If somehow time moved back, we don't want to infinitely keep throttling.
 523     if (now < last) {
 524       last = now;
 525       info.check_start = now;
 526     }
 527     Time earliest = last + TimeDelta::FromSeconds(info.throttle_delay);
 528     // If check is too soon, throttle.
 529     if (now < earliest)
 530       return false;
 531
 532     // TODO(mek): Somehow increase time between allowing checks when checks
 533     // are repeatedly throttled and don't result in updates being installed.
 534
 535     // It's okay to start a check, update values.
 536     info.check_start = now;
 537     info.in_progress = true;
 538   }
 539
 540   CheckParams params;
 541   params.ids.push_back(extension_id);
 542   params.callback = base::Bind(&ExtensionUpdater::ExtensionCheckFinished,
 543                                weak_ptr_factory_.GetWeakPtr(),
 544                                extension_id, callback);
 545   CheckNow(params);
 546   return true;
 547 }
 548
 549 void ExtensionUpdater::ExtensionCheckFinished(
 550     const std::string& extension_id,
 551     const FinishedCallback& callback) {
 552   std::map<std::string, ThrottleInfo>::iterator it =
 553       throttle_info_.find(extension_id);
 554   if (it != throttle_info_.end()) {
 555     it->second.in_progress = false;
 556   }
 557   callback.Run();
 558 }
 559
 560 void ExtensionUpdater::OnExtensionDownloadFailed(
 561     const std::string& id,
 562     Error error,
 563     const PingResult& ping,
 564     const std::set<int>& request_ids) {
 565   DCHECK(alive_);
 566   UpdatePingData(id, ping);
 567   bool install_immediately = false;
 568   for (std::set<int>::const_iterator it = request_ids.begin();
 569        it != request_ids.end(); ++it) {
 570     InProgressCheck& request = requests_in_progress_[*it];
 571     install_immediately |= request.install_immediately;
 572     request.in_progress_ids_.remove(id);
 573     NotifyIfFinished(*it);
 574   }
 575
 576   // This method is called if no updates were found. However a previous update
 577   // check might have queued an update for this extension already. If a
 578   // current update check has |install_immediately| set the previously
 579   // queued update should be installed now.
 580   if (install_immediately && service_->GetPendingExtensionUpdate(id))
 581     service_->FinishDelayedInstallation(id);
 582 }
 583
 584 void ExtensionUpdater::OnExtensionDownloadFinished(
 585     const std::string& id,
 586     const base::FilePath& path,
 587     bool file_ownership_passed,
 588     const GURL& download_url,
 589     const std::string& version,
 590     const PingResult& ping,
 591     const std::set<int>& request_ids) {
 592   DCHECK(alive_);
 593   UpdatePingData(id, ping);
 594
 595   VLOG(2) << download_url << " written to " << path.value();
 596
 597   FetchedCRXFile fetched(id, path, file_ownership_passed, request_ids);
 598   fetched_crx_files_.push(fetched);
 599
 600   // MaybeInstallCRXFile() removes extensions from |in_progress_ids_| after
 601   // starting the crx installer.
 602   MaybeInstallCRXFile();
 603 }
 604
 605 bool ExtensionUpdater::GetPingDataForExtension(
 606     const std::string& id,
 607     ManifestFetchData::PingData* ping_data) {
 608   DCHECK(alive_);
 609   ping_data->rollcall_days = CalculatePingDays(
 610       extension_prefs_->LastPingDay(id));
 611   ping_data->is_enabled = service_->IsExtensionEnabled(id);
 612   ping_data->active_days =
 613       CalculateActivePingDays(extension_prefs_->LastActivePingDay(id),
 614                               extension_prefs_->GetActiveBit(id));
 615   return true;
 616 }
 617
 618 std::string ExtensionUpdater::GetUpdateUrlData(const std::string& id) {
 619   DCHECK(alive_);
 620   return extension::GetUpdateURLData(extension_prefs_, id);
 621 }
 622
 623 bool ExtensionUpdater::IsExtensionPending(const std::string& id) {
 624   DCHECK(alive_);
 625   return service_->pending_extension_manager()->IsIdPending(id);
 626 }
 627
 628 bool ExtensionUpdater::GetExtensionExistingVersion(const std::string& id,
 629                                                    std::string* version) {
 630   DCHECK(alive_);
 631   const Extension* extension = service_->GetExtensionById(id, true);
 632   if (!extension)
 633     return false;
 634   const Extension* update = service_->GetPendingExtensionUpdate(id);
 635   if (update)
 636     *version = update->VersionString();
 637   else
 638     *version = extension->VersionString();
 639   return true;
 640 }
 641
 642 bool ExtensionUpdater::ShouldForceUpdate(
 643     const std::string& extension_id,
 644     std::string* source) {
 645   bool force = forced_updates_.find(extension_id) != forced_updates_.end();
 646   // Currently the only reason to force is a NaCl arch mismatch with the
 647   // installed extension contents.
 648   if (force) {
 649     *source = kWrongMultiCrxInstallSource;
 650   }
 651   return force;
 652 }
 653
 654 void ExtensionUpdater::UpdatePingData(const std::string& id,
 655                                       const PingResult& ping_result) {
 656   DCHECK(alive_);
 657   if (ping_result.did_ping)
 658     extension_prefs_->SetLastPingDay(id, ping_result.day_start);
 659   if (extension_prefs_->GetActiveBit(id)) {
 660     extension_prefs_->SetActiveBit(id, false);
 661     extension_prefs_->SetLastActivePingDay(id, ping_result.day_start);
 662   }
 663 }
 664
 665 void ExtensionUpdater::MaybeInstallCRXFile() {
 666   if (crx_install_is_running_ || fetched_crx_files_.empty())
 667     return;
 668
 669   std::set<int> request_ids;
 670
 671   while (!fetched_crx_files_.empty() && !crx_install_is_running_) {
 672     const FetchedCRXFile& crx_file = fetched_crx_files_.top();
 673
 674     VLOG(2) << "updating " << crx_file.extension_id
 675             << " with " << crx_file.path.value();
 676
 677     // The ExtensionService is now responsible for cleaning up the temp file
 678     // at |crx_file.path|.
 679     CrxInstaller* installer = NULL;
 680     if (service_->UpdateExtension(crx_file.extension_id,
 681                                   crx_file.path,
 682                                   crx_file.file_ownership_passed,
 683                                   &installer)) {
 684       crx_install_is_running_ = true;
 685       current_crx_file_ = crx_file;
 686
 687       for (std::set<int>::const_iterator it = crx_file.request_ids.begin();
 688           it != crx_file.request_ids.end(); ++it) {
 689         InProgressCheck& request = requests_in_progress_[*it];
 690         if (request.install_immediately) {
 691           installer->set_install_immediately(true);
 692           break;
 693         }
 694       }
 695
 696       // Source parameter ensures that we only see the completion event for the
 697       // the installer we started.
 698       registrar_.Add(this,
 699                      extensions::NOTIFICATION_CRX_INSTALLER_DONE,
 700                      content::Source<CrxInstaller>(installer));
 701     } else {
 702       for (std::set<int>::const_iterator it = crx_file.request_ids.begin();
 703            it != crx_file.request_ids.end(); ++it) {
 704         InProgressCheck& request = requests_in_progress_[*it];
 705         request.in_progress_ids_.remove(crx_file.extension_id);
 706       }
 707       request_ids.insert(crx_file.request_ids.begin(),
 708                          crx_file.request_ids.end());
 709     }
 710     fetched_crx_files_.pop();
 711   }
 712
 713   for (std::set<int>::const_iterator it = request_ids.begin();
 714        it != request_ids.end(); ++it) {
 715     NotifyIfFinished(*it);
 716   }
 717 }
 718
 719 void ExtensionUpdater::Observe(int type,
 720                                const content::NotificationSource& source,
 721                                const content::NotificationDetails& details) {
 722   DCHECK_EQ(type, extensions::NOTIFICATION_CRX_INSTALLER_DONE);
 723
 724   registrar_.Remove(this, extensions::NOTIFICATION_CRX_INSTALLER_DONE, source);
 725   crx_install_is_running_ = false;
 726
 727   const FetchedCRXFile& crx_file = current_crx_file_;
 728   for (std::set<int>::const_iterator it = crx_file.request_ids.begin();
 729       it != crx_file.request_ids.end(); ++it) {
 730     InProgressCheck& request = requests_in_progress_[*it];
 731     request.in_progress_ids_.remove(crx_file.extension_id);
 732     NotifyIfFinished(*it);
 733   }
 734
 735   // If any files are available to update, start one.
 736   MaybeInstallCRXFile();
 737 }
 738
 739 void ExtensionUpdater::OnExtensionWillBeInstalled(
 740     content::BrowserContext* browser_context,
 741     const Extension* extension,
 742     bool is_update,
 743     bool from_ephemeral,
 744     const std::string& old_name) {
 745   throttle_info_.erase(extension->id());
 746 }
 747
 748 void ExtensionUpdater::NotifyStarted() {
 749   content::NotificationService::current()->Notify(
 750       extensions::NOTIFICATION_EXTENSION_UPDATING_STARTED,
 751       content::Source<Profile>(profile_),
 752       content::NotificationService::NoDetails());
 753 }
 754
 755 void ExtensionUpdater::NotifyIfFinished(int request_id) {
 756   DCHECK(ContainsKey(requests_in_progress_, request_id));
 757   const InProgressCheck& request = requests_in_progress_[request_id];
 758   if (request.in_progress_ids_.empty()) {
 759     VLOG(2) << "Finished update check " << request_id;
 760     if (!request.callback.is_null())
 761       request.callback.Run();
 762     requests_in_progress_.erase(request_id);
 763   }
 764 }
 765
 766 }  // namespace extensions