src/content/browser/download/download_manager_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 #include "content/browser/download/download_manager_impl.h"
   6
   7 #include <iterator>
   8
   9 #include "base/bind.h"
  10 #include "base/callback.h"
  11 #include "base/debug/alias.h"
  12 #include "base/i18n/case_conversion.h"
  13 #include "base/logging.h"
  14 #include "base/message_loop/message_loop.h"
  15 #include "base/stl_util.h"
  16 #include "base/strings/stringprintf.h"
  17 #include "base/strings/sys_string_conversions.h"
  18 #include "base/supports_user_data.h"
  19 #include "base/synchronization/lock.h"
  20 #include "build/build_config.h"
  21 #include "content/browser/byte_stream.h"
  22 #include "content/browser/download/download_create_info.h"
  23 #include "content/browser/download/download_file_factory.h"
  24 #include "content/browser/download/download_item_factory.h"
  25 #include "content/browser/download/download_item_impl.h"
  26 #include "content/browser/download/download_stats.h"
  27 #include "content/browser/loader/resource_dispatcher_host_impl.h"
  28 #include "content/browser/renderer_host/render_view_host_impl.h"
  29 #include "content/browser/web_contents/web_contents_impl.h"
  30 #include "content/public/browser/browser_context.h"
  31 #include "content/public/browser/browser_thread.h"
  32 #include "content/public/browser/content_browser_client.h"
  33 #include "content/public/browser/download_interrupt_reasons.h"
  34 #include "content/public/browser/download_manager_delegate.h"
  35 #include "content/public/browser/download_url_parameters.h"
  36 #include "content/public/browser/notification_service.h"
  37 #include "content/public/browser/notification_types.h"
  38 #include "content/public/browser/render_process_host.h"
  39 #include "content/public/browser/resource_context.h"
  40 #include "content/public/browser/web_contents_delegate.h"
  41 #include "content/public/common/referrer.h"
  42 #include "net/base/load_flags.h"
  43 #include "net/base/request_priority.h"
  44 #include "net/base/upload_bytes_element_reader.h"
  45 #include "net/base/upload_data_stream.h"
  46 #include "net/url_request/url_request_context.h"
  47
  48 namespace content {
  49 namespace {
  50
  51 void BeginDownload(scoped_ptr<DownloadUrlParameters> params,
  52                    uint32 download_id) {
  53   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
  54   // ResourceDispatcherHost{Base} is-not-a URLRequest::Delegate, and
  55   // DownloadUrlParameters can-not include resource_dispatcher_host_impl.h, so
  56   // we must down cast. RDHI is the only subclass of RDH as of 2012 May 4.
  57   scoped_ptr<net::URLRequest> request(
  58       params->resource_context()->GetRequestContext()->CreateRequest(
  59           params->url(), net::DEFAULT_PRIORITY, NULL));
  60   request->set_load_flags(request->load_flags() | params->load_flags());
  61   request->set_method(params->method());
  62   if (!params->post_body().empty()) {
  63     const std::string& body = params->post_body();
  64     scoped_ptr<net::UploadElementReader> reader(
  65         net::UploadOwnedBytesElementReader::CreateWithString(body));
  66     request->set_upload(make_scoped_ptr(
  67         net::UploadDataStream::CreateWithReader(reader.Pass(), 0)));
  68   }
  69   if (params->post_id() >= 0) {
  70     // The POST in this case does not have an actual body, and only works
  71     // when retrieving data from cache. This is done because we don't want
  72     // to do a re-POST without user consent, and currently don't have a good
  73     // plan on how to display the UI for that.
  74     DCHECK(params->prefer_cache());
  75     DCHECK_EQ("POST", params->method());
  76     ScopedVector<net::UploadElementReader> element_readers;
  77     request->set_upload(make_scoped_ptr(
  78         new net::UploadDataStream(element_readers.Pass(), params->post_id())));
  79   }
  80
  81   // If we're not at the beginning of the file, retrieve only the remaining
  82   // portion.
  83   bool has_last_modified = !params->last_modified().empty();
  84   bool has_etag = !params->etag().empty();
  85
  86   // If we've asked for a range, we want to make sure that we only
  87   // get that range if our current copy of the information is good.
  88   // We shouldn't be asked to continue if we don't have a verifier.
  89   DCHECK(params->offset() == 0 || has_etag || has_last_modified);
  90
  91   if (params->offset() > 0) {
  92     request->SetExtraRequestHeaderByName(
  93         "Range",
  94         base::StringPrintf("bytes=%" PRId64 "-", params->offset()),
  95         true);
  96
  97     if (has_last_modified) {
  98       request->SetExtraRequestHeaderByName("If-Unmodified-Since",
  99                                            params->last_modified(),
 100                                            true);
 101     }
 102     if (has_etag) {
 103       request->SetExtraRequestHeaderByName("If-Match", params->etag(), true);
 104     }
 105   }
 106
 107   for (DownloadUrlParameters::RequestHeadersType::const_iterator iter
 108            = params->request_headers_begin();
 109        iter != params->request_headers_end();
 110        ++iter) {
 111     request->SetExtraRequestHeaderByName(
 112         iter->first, iter->second, false /*overwrite*/);
 113   }
 114
 115   scoped_ptr<DownloadSaveInfo> save_info(new DownloadSaveInfo());
 116   save_info->file_path = params->file_path();
 117   save_info->suggested_name = params->suggested_name();
 118   save_info->offset = params->offset();
 119   save_info->hash_state = params->hash_state();
 120   save_info->prompt_for_save_location = params->prompt();
 121   save_info->file_stream = params->GetFileStream();
 122
 123   ResourceDispatcherHost::Get()->BeginDownload(
 124       request.Pass(),
 125       params->referrer(),
 126       params->content_initiated(),
 127       params->resource_context(),
 128       params->render_process_host_id(),
 129       params->render_view_host_routing_id(),
 130       params->prefer_cache(),
 131       save_info.Pass(),
 132       download_id,
 133       params->callback());
 134 }
 135
 136 class MapValueIteratorAdapter {
 137  public:
 138   explicit MapValueIteratorAdapter(
 139       base::hash_map<int64, DownloadItem*>::const_iterator iter)
 140     : iter_(iter) {
 141   }
 142   ~MapValueIteratorAdapter() {}
 143
 144   DownloadItem* operator*() { return iter_->second; }
 145
 146   MapValueIteratorAdapter& operator++() {
 147     ++iter_;
 148     return *this;
 149   }
 150
 151   bool operator!=(const MapValueIteratorAdapter& that) const {
 152     return iter_ != that.iter_;
 153   }
 154
 155  private:
 156   base::hash_map<int64, DownloadItem*>::const_iterator iter_;
 157   // Allow copy and assign.
 158 };
 159
 160 void EnsureNoPendingDownloadJobsOnFile(bool* result) {
 161   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
 162   *result = (DownloadFile::GetNumberOfDownloadFiles() == 0);
 163   BrowserThread::PostTask(
 164       BrowserThread::UI, FROM_HERE, base::MessageLoop::QuitClosure());
 165 }
 166
 167 class DownloadItemFactoryImpl : public DownloadItemFactory {
 168  public:
 169   DownloadItemFactoryImpl() {}
 170   virtual ~DownloadItemFactoryImpl() {}
 171
 172   virtual DownloadItemImpl* CreatePersistedItem(
 173       DownloadItemImplDelegate* delegate,
 174       uint32 download_id,
 175       const base::FilePath& current_path,
 176       const base::FilePath& target_path,
 177       const std::vector<GURL>& url_chain,
 178       const GURL& referrer_url,
 179       const base::Time& start_time,
 180       const base::Time& end_time,
 181       const std::string& etag,
 182       const std::string& last_modified,
 183       int64 received_bytes,
 184       int64 total_bytes,
 185       DownloadItem::DownloadState state,
 186       DownloadDangerType danger_type,
 187       DownloadInterruptReason interrupt_reason,
 188       bool opened,
 189       const net::BoundNetLog& bound_net_log) OVERRIDE {
 190     return new DownloadItemImpl(
 191         delegate,
 192         download_id,
 193         current_path,
 194         target_path,
 195         url_chain,
 196         referrer_url,
 197         start_time,
 198         end_time,
 199         etag,
 200         last_modified,
 201         received_bytes,
 202         total_bytes,
 203         state,
 204         danger_type,
 205         interrupt_reason,
 206         opened,
 207         bound_net_log);
 208   }
 209
 210   virtual DownloadItemImpl* CreateActiveItem(
 211       DownloadItemImplDelegate* delegate,
 212       uint32 download_id,
 213       const DownloadCreateInfo& info,
 214       const net::BoundNetLog& bound_net_log) OVERRIDE {
 215     return new DownloadItemImpl(delegate, download_id, info, bound_net_log);
 216   }
 217
 218   virtual DownloadItemImpl* CreateSavePageItem(
 219       DownloadItemImplDelegate* delegate,
 220       uint32 download_id,
 221       const base::FilePath& path,
 222       const GURL& url,
 223       const std::string& mime_type,
 224       scoped_ptr<DownloadRequestHandleInterface> request_handle,
 225       const net::BoundNetLog& bound_net_log) OVERRIDE {
 226     return new DownloadItemImpl(delegate, download_id, path, url,
 227                                 mime_type, request_handle.Pass(),
 228                                 bound_net_log);
 229   }
 230 };
 231
 232 }  // namespace
 233
 234 DownloadManagerImpl::DownloadManagerImpl(
 235     net::NetLog* net_log,
 236     BrowserContext* browser_context)
 237     : item_factory_(new DownloadItemFactoryImpl()),
 238       file_factory_(new DownloadFileFactory()),
 239       history_size_(0),
 240       shutdown_needed_(true),
 241       browser_context_(browser_context),
 242       delegate_(NULL),
 243       net_log_(net_log),
 244       weak_factory_(this) {
 245   DCHECK(browser_context);
 246 }
 247
 248 DownloadManagerImpl::~DownloadManagerImpl() {
 249   DCHECK(!shutdown_needed_);
 250 }
 251
 252 DownloadItemImpl* DownloadManagerImpl::CreateActiveItem(
 253     uint32 id, const DownloadCreateInfo& info) {
 254   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 255   DCHECK(!ContainsKey(downloads_, id));
 256   net::BoundNetLog bound_net_log =
 257       net::BoundNetLog::Make(net_log_, net::NetLog::SOURCE_DOWNLOAD);
 258   DownloadItemImpl* download =
 259       item_factory_->CreateActiveItem(this, id, info, bound_net_log);
 260   downloads_[id] = download;
 261   return download;
 262 }
 263
 264 void DownloadManagerImpl::GetNextId(const DownloadIdCallback& callback) {
 265   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 266   if (delegate_) {
 267     delegate_->GetNextId(callback);
 268     return;
 269   }
 270   static uint32 next_id = content::DownloadItem::kInvalidId + 1;
 271   callback.Run(next_id++);
 272 }
 273
 274 void DownloadManagerImpl::DetermineDownloadTarget(
 275     DownloadItemImpl* item, const DownloadTargetCallback& callback) {
 276   // Note that this next call relies on
 277   // DownloadItemImplDelegate::DownloadTargetCallback and
 278   // DownloadManagerDelegate::DownloadTargetCallback having the same
 279   // type.  If the types ever diverge, gasket code will need to
 280   // be written here.
 281   if (!delegate_ || !delegate_->DetermineDownloadTarget(item, callback)) {
 282     base::FilePath target_path = item->GetForcedFilePath();
 283     // TODO(asanka): Determine a useful path if |target_path| is empty.
 284     callback.Run(target_path,
 285                  DownloadItem::TARGET_DISPOSITION_OVERWRITE,
 286                  DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS,
 287                  target_path);
 288   }
 289 }
 290
 291 bool DownloadManagerImpl::ShouldCompleteDownload(
 292     DownloadItemImpl* item, const base::Closure& complete_callback) {
 293   if (!delegate_ ||
 294       delegate_->ShouldCompleteDownload(item, complete_callback)) {
 295     return true;
 296   }
 297   // Otherwise, the delegate has accepted responsibility to run the
 298   // callback when the download is ready for completion.
 299   return false;
 300 }
 301
 302 bool DownloadManagerImpl::ShouldOpenFileBasedOnExtension(
 303     const base::FilePath& path) {
 304   if (!delegate_)
 305     return false;
 306
 307   return delegate_->ShouldOpenFileBasedOnExtension(path);
 308 }
 309
 310 bool DownloadManagerImpl::ShouldOpenDownload(
 311     DownloadItemImpl* item, const ShouldOpenDownloadCallback& callback) {
 312   if (!delegate_)
 313     return true;
 314
 315   // Relies on DownloadItemImplDelegate::ShouldOpenDownloadCallback and
 316   // DownloadManagerDelegate::DownloadOpenDelayedCallback "just happening"
 317   // to have the same type :-}.
 318   return delegate_->ShouldOpenDownload(item, callback);
 319 }
 320
 321 void DownloadManagerImpl::SetDelegate(DownloadManagerDelegate* delegate) {
 322   delegate_ = delegate;
 323 }
 324
 325 DownloadManagerDelegate* DownloadManagerImpl::GetDelegate() const {
 326   return delegate_;
 327 }
 328
 329 void DownloadManagerImpl::Shutdown() {
 330   VLOG(20) << __FUNCTION__ << "()"
 331            << " shutdown_needed_ = " << shutdown_needed_;
 332   if (!shutdown_needed_)
 333     return;
 334   shutdown_needed_ = false;
 335
 336   FOR_EACH_OBSERVER(Observer, observers_, ManagerGoingDown(this));
 337   // TODO(benjhayden): Consider clearing observers_.
 338
 339   // If there are in-progress downloads, cancel them. This also goes for
 340   // dangerous downloads which will remain in history if they aren't explicitly
 341   // accepted or discarded. Canceling will remove the intermediate download
 342   // file.
 343   for (DownloadMap::iterator it = downloads_.begin(); it != downloads_.end();
 344        ++it) {
 345     DownloadItemImpl* download = it->second;
 346     if (download->GetState() == DownloadItem::IN_PROGRESS)
 347       download->Cancel(false);
 348   }
 349   STLDeleteValues(&downloads_);
 350   downloads_.clear();
 351
 352   // We'll have nothing more to report to the observers after this point.
 353   observers_.Clear();
 354
 355   if (delegate_)
 356     delegate_->Shutdown();
 357   delegate_ = NULL;
 358 }
 359
 360 void DownloadManagerImpl::StartDownload(
 361     scoped_ptr<DownloadCreateInfo> info,
 362     scoped_ptr<ByteStreamReader> stream,
 363     const DownloadUrlParameters::OnStartedCallback& on_started) {
 364   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 365   DCHECK(info);
 366   uint32 download_id = info->download_id;
 367   const bool new_download = (download_id == content::DownloadItem::kInvalidId);
 368   base::Callback<void(uint32)> got_id(base::Bind(
 369       &DownloadManagerImpl::StartDownloadWithId,
 370       weak_factory_.GetWeakPtr(),
 371       base::Passed(info.Pass()),
 372       base::Passed(stream.Pass()),
 373       on_started,
 374       new_download));
 375   if (new_download) {
 376     GetNextId(got_id);
 377   } else {
 378     got_id.Run(download_id);
 379   }
 380 }
 381
 382 void DownloadManagerImpl::StartDownloadWithId(
 383     scoped_ptr<DownloadCreateInfo> info,
 384     scoped_ptr<ByteStreamReader> stream,
 385     const DownloadUrlParameters::OnStartedCallback& on_started,
 386     bool new_download,
 387     uint32 id) {
 388   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 389   DCHECK_NE(content::DownloadItem::kInvalidId, id);
 390   DownloadItemImpl* download = NULL;
 391   if (new_download) {
 392     download = CreateActiveItem(id, *info);
 393   } else {
 394     DownloadMap::iterator item_iterator = downloads_.find(id);
 395     // Trying to resume an interrupted download.
 396     if (item_iterator == downloads_.end() ||
 397         (item_iterator->second->GetState() == DownloadItem::CANCELLED)) {
 398       // If the download is no longer known to the DownloadManager, then it was
 399       // removed after it was resumed. Ignore. If the download is cancelled
 400       // while resuming, then also ignore the request.
 401       info->request_handle.CancelRequest();
 402       if (!on_started.is_null())
 403         on_started.Run(NULL, net::ERR_ABORTED);
 404       return;
 405     }
 406     download = item_iterator->second;
 407     DCHECK_EQ(DownloadItem::INTERRUPTED, download->GetState());
 408   }
 409
 410   base::FilePath default_download_directory;
 411   if (delegate_) {
 412     base::FilePath website_save_directory;  // Unused
 413     bool skip_dir_check = false;            // Unused
 414     delegate_->GetSaveDir(GetBrowserContext(), &website_save_directory,
 415                           &default_download_directory, &skip_dir_check);
 416   }
 417
 418   // Create the download file and start the download.
 419   scoped_ptr<DownloadFile> download_file(
 420       file_factory_->CreateFile(
 421           info->save_info.Pass(), default_download_directory,
 422           info->url(), info->referrer_url,
 423           delegate_->GenerateFileHash(),
 424           stream.Pass(), download->GetBoundNetLog(),
 425           download->DestinationObserverAsWeakPtr()));
 426
 427   // Attach the client ID identifying the app to the AV system.
 428   if (download_file.get() && delegate_) {
 429     download_file->SetClientGuid(
 430         delegate_->ApplicationClientIdForFileScanning());
 431   }
 432
 433   scoped_ptr<DownloadRequestHandleInterface> req_handle(
 434       new DownloadRequestHandle(info->request_handle));
 435   download->Start(download_file.Pass(), req_handle.Pass());
 436
 437   // For interrupted downloads, Start() will transition the state to
 438   // IN_PROGRESS and consumers will be notified via OnDownloadUpdated().
 439   // For new downloads, we notify here, rather than earlier, so that
 440   // the download_file is bound to download and all the usual
 441   // setters (e.g. Cancel) work.
 442   if (new_download)
 443     FOR_EACH_OBSERVER(Observer, observers_, OnDownloadCreated(this, download));
 444
 445   if (!on_started.is_null())
 446     on_started.Run(download, net::OK);
 447 }
 448
 449 void DownloadManagerImpl::CheckForHistoryFilesRemoval() {
 450   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 451   for (DownloadMap::iterator it = downloads_.begin();
 452        it != downloads_.end(); ++it) {
 453     DownloadItemImpl* item = it->second;
 454     CheckForFileRemoval(item);
 455   }
 456 }
 457
 458 void DownloadManagerImpl::CheckForFileRemoval(DownloadItemImpl* download_item) {
 459   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 460   if ((download_item->GetState() == DownloadItem::COMPLETE) &&
 461       !download_item->GetFileExternallyRemoved() &&
 462       delegate_) {
 463     delegate_->CheckForFileExistence(
 464         download_item,
 465         base::Bind(&DownloadManagerImpl::OnFileExistenceChecked,
 466                    weak_factory_.GetWeakPtr(), download_item->GetId()));
 467   }
 468 }
 469
 470 void DownloadManagerImpl::OnFileExistenceChecked(uint32 download_id,
 471                                                  bool result) {
 472   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 473   if (!result) {  // File does not exist.
 474     if (ContainsKey(downloads_, download_id))
 475       downloads_[download_id]->OnDownloadedFileRemoved();
 476   }
 477 }
 478
 479 BrowserContext* DownloadManagerImpl::GetBrowserContext() const {
 480   return browser_context_;
 481 }
 482
 483 void DownloadManagerImpl::CreateSavePackageDownloadItem(
 484     const base::FilePath& main_file_path,
 485     const GURL& page_url,
 486     const std::string& mime_type,
 487     scoped_ptr<DownloadRequestHandleInterface> request_handle,
 488     const DownloadItemImplCreated& item_created) {
 489   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 490   GetNextId(base::Bind(
 491       &DownloadManagerImpl::CreateSavePackageDownloadItemWithId,
 492       weak_factory_.GetWeakPtr(),
 493       main_file_path,
 494       page_url,
 495       mime_type,
 496       base::Passed(request_handle.Pass()),
 497       item_created));
 498 }
 499
 500 void DownloadManagerImpl::CreateSavePackageDownloadItemWithId(
 501     const base::FilePath& main_file_path,
 502     const GURL& page_url,
 503     const std::string& mime_type,
 504     scoped_ptr<DownloadRequestHandleInterface> request_handle,
 505     const DownloadItemImplCreated& item_created,
 506     uint32 id) {
 507   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 508   DCHECK_NE(content::DownloadItem::kInvalidId, id);
 509   DCHECK(!ContainsKey(downloads_, id));
 510   net::BoundNetLog bound_net_log =
 511       net::BoundNetLog::Make(net_log_, net::NetLog::SOURCE_DOWNLOAD);
 512   DownloadItemImpl* download_item = item_factory_->CreateSavePageItem(
 513       this,
 514       id,
 515       main_file_path,
 516       page_url,
 517       mime_type,
 518       request_handle.Pass(),
 519       bound_net_log);
 520   downloads_[download_item->GetId()] = download_item;
 521   FOR_EACH_OBSERVER(Observer, observers_, OnDownloadCreated(
 522       this, download_item));
 523   if (!item_created.is_null())
 524     item_created.Run(download_item);
 525 }
 526
 527 void DownloadManagerImpl::OnSavePackageSuccessfullyFinished(
 528     DownloadItem* download_item) {
 529   FOR_EACH_OBSERVER(Observer, observers_,
 530                     OnSavePackageSuccessfullyFinished(this, download_item));
 531 }
 532
 533 // Resume a download of a specific URL. We send the request to the
 534 // ResourceDispatcherHost, and let it send us responses like a regular
 535 // download.
 536 void DownloadManagerImpl::ResumeInterruptedDownload(
 537     scoped_ptr<content::DownloadUrlParameters> params,
 538     uint32 id) {
 539   RecordDownloadSource(INITIATED_BY_RESUMPTION);
 540   BrowserThread::PostTask(
 541       BrowserThread::IO,
 542       FROM_HERE,
 543       base::Bind(&BeginDownload, base::Passed(&params), id));
 544 }
 545
 546 void DownloadManagerImpl::SetDownloadItemFactoryForTesting(
 547     scoped_ptr<DownloadItemFactory> item_factory) {
 548   item_factory_ = item_factory.Pass();
 549 }
 550
 551 void DownloadManagerImpl::SetDownloadFileFactoryForTesting(
 552     scoped_ptr<DownloadFileFactory> file_factory) {
 553   file_factory_ = file_factory.Pass();
 554 }
 555
 556 DownloadFileFactory* DownloadManagerImpl::GetDownloadFileFactoryForTesting() {
 557   return file_factory_.get();
 558 }
 559
 560 void DownloadManagerImpl::DownloadRemoved(DownloadItemImpl* download) {
 561   if (!download)
 562     return;
 563
 564   uint32 download_id = download->GetId();
 565   if (downloads_.erase(download_id) == 0)
 566     return;
 567   delete download;
 568 }
 569
 570 int DownloadManagerImpl::RemoveDownloadsBetween(base::Time remove_begin,
 571                                                 base::Time remove_end) {
 572   int count = 0;
 573   DownloadMap::const_iterator it = downloads_.begin();
 574   while (it != downloads_.end()) {
 575     DownloadItemImpl* download = it->second;
 576
 577     // Increment done here to protect against invalidation below.
 578     ++it;
 579
 580     if (download->GetStartTime() >= remove_begin &&
 581         (remove_end.is_null() || download->GetStartTime() < remove_end) &&
 582         (download->GetState() != DownloadItem::IN_PROGRESS)) {
 583       // Erases the download from downloads_.
 584       download->Remove();
 585       count++;
 586     }
 587   }
 588   return count;
 589 }
 590
 591 int DownloadManagerImpl::RemoveDownloads(base::Time remove_begin) {
 592   return RemoveDownloadsBetween(remove_begin, base::Time());
 593 }
 594
 595 int DownloadManagerImpl::RemoveAllDownloads() {
 596   // The null times make the date range unbounded.
 597   int num_deleted = RemoveDownloadsBetween(base::Time(), base::Time());
 598   RecordClearAllSize(num_deleted);
 599   return num_deleted;
 600 }
 601
 602 void DownloadManagerImpl::DownloadUrl(
 603     scoped_ptr<DownloadUrlParameters> params) {
 604   if (params->post_id() >= 0) {
 605     // Check this here so that the traceback is more useful.
 606     DCHECK(params->prefer_cache());
 607     DCHECK_EQ("POST", params->method());
 608   }
 609   BrowserThread::PostTask(BrowserThread::IO, FROM_HERE, base::Bind(
 610       &BeginDownload, base::Passed(&params),
 611       content::DownloadItem::kInvalidId));
 612 }
 613
 614 void DownloadManagerImpl::AddObserver(Observer* observer) {
 615   observers_.AddObserver(observer);
 616 }
 617
 618 void DownloadManagerImpl::RemoveObserver(Observer* observer) {
 619   observers_.RemoveObserver(observer);
 620 }
 621
 622 DownloadItem* DownloadManagerImpl::CreateDownloadItem(
 623     uint32 id,
 624     const base::FilePath& current_path,
 625     const base::FilePath& target_path,
 626     const std::vector<GURL>& url_chain,
 627     const GURL& referrer_url,
 628     const base::Time& start_time,
 629     const base::Time& end_time,
 630     const std::string& etag,
 631     const std::string& last_modified,
 632     int64 received_bytes,
 633     int64 total_bytes,
 634     DownloadItem::DownloadState state,
 635     DownloadDangerType danger_type,
 636     DownloadInterruptReason interrupt_reason,
 637     bool opened) {
 638   if (ContainsKey(downloads_, id)) {
 639     NOTREACHED();
 640     return NULL;
 641   }
 642   DownloadItemImpl* item = item_factory_->CreatePersistedItem(
 643       this,
 644       id,
 645       current_path,
 646       target_path,
 647       url_chain,
 648       referrer_url,
 649       start_time,
 650       end_time,
 651       etag,
 652       last_modified,
 653       received_bytes,
 654       total_bytes,
 655       state,
 656       danger_type,
 657       interrupt_reason,
 658       opened,
 659       net::BoundNetLog::Make(net_log_, net::NetLog::SOURCE_DOWNLOAD));
 660   downloads_[id] = item;
 661   FOR_EACH_OBSERVER(Observer, observers_, OnDownloadCreated(this, item));
 662   VLOG(20) << __FUNCTION__ << "() download = " << item->DebugString(true);
 663   return item;
 664 }
 665
 666 int DownloadManagerImpl::InProgressCount() const {
 667   int count = 0;
 668   for (DownloadMap::const_iterator it = downloads_.begin();
 669        it != downloads_.end(); ++it) {
 670     if (it->second->GetState() == DownloadItem::IN_PROGRESS)
 671       ++count;
 672   }
 673   return count;
 674 }
 675
 676 int DownloadManagerImpl::NonMaliciousInProgressCount() const {
 677   int count = 0;
 678   for (DownloadMap::const_iterator it = downloads_.begin();
 679        it != downloads_.end(); ++it) {
 680     if (it->second->GetState() == DownloadItem::IN_PROGRESS &&
 681         it->second->GetDangerType() != DOWNLOAD_DANGER_TYPE_DANGEROUS_URL &&
 682         it->second->GetDangerType() != DOWNLOAD_DANGER_TYPE_DANGEROUS_CONTENT &&
 683         it->second->GetDangerType() != DOWNLOAD_DANGER_TYPE_DANGEROUS_HOST &&
 684         it->second->GetDangerType() !=
 685             DOWNLOAD_DANGER_TYPE_POTENTIALLY_UNWANTED) {
 686       ++count;
 687     }
 688   }
 689   return count;
 690 }
 691
 692 DownloadItem* DownloadManagerImpl::GetDownload(uint32 download_id) {
 693   return ContainsKey(downloads_, download_id) ? downloads_[download_id] : NULL;
 694 }
 695
 696 void DownloadManagerImpl::GetAllDownloads(DownloadVector* downloads) {
 697   for (DownloadMap::iterator it = downloads_.begin();
 698        it != downloads_.end(); ++it) {
 699     downloads->push_back(it->second);
 700   }
 701 }
 702
 703 void DownloadManagerImpl::OpenDownload(DownloadItemImpl* download) {
 704   int num_unopened = 0;
 705   for (DownloadMap::iterator it = downloads_.begin();
 706        it != downloads_.end(); ++it) {
 707     DownloadItemImpl* item = it->second;
 708     if ((item->GetState() == DownloadItem::COMPLETE) &&
 709         !item->GetOpened())
 710       ++num_unopened;
 711   }
 712   RecordOpensOutstanding(num_unopened);
 713
 714   if (delegate_)
 715     delegate_->OpenDownload(download);
 716 }
 717
 718 void DownloadManagerImpl::ShowDownloadInShell(DownloadItemImpl* download) {
 719   if (delegate_)
 720     delegate_->ShowDownloadInShell(download);
 721 }
 722
 723 }  // namespace content