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, NULL));
  60   request->SetLoadFlags(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 = params->GetFile();
 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 class DownloadItemFactoryImpl : public DownloadItemFactory {
 161  public:
 162   DownloadItemFactoryImpl() {}
 163   virtual ~DownloadItemFactoryImpl() {}
 164
 165   virtual DownloadItemImpl* CreatePersistedItem(
 166       DownloadItemImplDelegate* delegate,
 167       uint32 download_id,
 168       const base::FilePath& current_path,
 169       const base::FilePath& target_path,
 170       const std::vector<GURL>& url_chain,
 171       const GURL& referrer_url,
 172       const std::string& mime_type,
 173       const std::string& original_mime_type,
 174       const base::Time& start_time,
 175       const base::Time& end_time,
 176       const std::string& etag,
 177       const std::string& last_modified,
 178       int64 received_bytes,
 179       int64 total_bytes,
 180       DownloadItem::DownloadState state,
 181       DownloadDangerType danger_type,
 182       DownloadInterruptReason interrupt_reason,
 183       bool opened,
 184       const net::BoundNetLog& bound_net_log) OVERRIDE {
 185     return new DownloadItemImpl(
 186         delegate,
 187         download_id,
 188         current_path,
 189         target_path,
 190         url_chain,
 191         referrer_url,
 192         mime_type,
 193         original_mime_type,
 194         start_time,
 195         end_time,
 196         etag,
 197         last_modified,
 198         received_bytes,
 199         total_bytes,
 200         state,
 201         danger_type,
 202         interrupt_reason,
 203         opened,
 204         bound_net_log);
 205   }
 206
 207   virtual DownloadItemImpl* CreateActiveItem(
 208       DownloadItemImplDelegate* delegate,
 209       uint32 download_id,
 210       const DownloadCreateInfo& info,
 211       const net::BoundNetLog& bound_net_log) OVERRIDE {
 212     return new DownloadItemImpl(delegate, download_id, info, bound_net_log);
 213   }
 214
 215   virtual DownloadItemImpl* CreateSavePageItem(
 216       DownloadItemImplDelegate* delegate,
 217       uint32 download_id,
 218       const base::FilePath& path,
 219       const GURL& url,
 220       const std::string& mime_type,
 221       scoped_ptr<DownloadRequestHandleInterface> request_handle,
 222       const net::BoundNetLog& bound_net_log) OVERRIDE {
 223     return new DownloadItemImpl(delegate, download_id, path, url,
 224                                 mime_type, request_handle.Pass(),
 225                                 bound_net_log);
 226   }
 227 };
 228
 229 }  // namespace
 230
 231 DownloadManagerImpl::DownloadManagerImpl(
 232     net::NetLog* net_log,
 233     BrowserContext* browser_context)
 234     : item_factory_(new DownloadItemFactoryImpl()),
 235       file_factory_(new DownloadFileFactory()),
 236       history_size_(0),
 237       shutdown_needed_(true),
 238       browser_context_(browser_context),
 239       delegate_(NULL),
 240       net_log_(net_log),
 241       weak_factory_(this) {
 242   DCHECK(browser_context);
 243 }
 244
 245 DownloadManagerImpl::~DownloadManagerImpl() {
 246   DCHECK(!shutdown_needed_);
 247 }
 248
 249 DownloadItemImpl* DownloadManagerImpl::CreateActiveItem(
 250     uint32 id, const DownloadCreateInfo& info) {
 251   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 252   DCHECK(!ContainsKey(downloads_, id));
 253   net::BoundNetLog bound_net_log =
 254       net::BoundNetLog::Make(net_log_, net::NetLog::SOURCE_DOWNLOAD);
 255   DownloadItemImpl* download =
 256       item_factory_->CreateActiveItem(this, id, info, bound_net_log);
 257   downloads_[id] = download;
 258   return download;
 259 }
 260
 261 void DownloadManagerImpl::GetNextId(const DownloadIdCallback& callback) {
 262   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 263   if (delegate_) {
 264     delegate_->GetNextId(callback);
 265     return;
 266   }
 267   static uint32 next_id = content::DownloadItem::kInvalidId + 1;
 268   callback.Run(next_id++);
 269 }
 270
 271 void DownloadManagerImpl::DetermineDownloadTarget(
 272     DownloadItemImpl* item, const DownloadTargetCallback& callback) {
 273   // Note that this next call relies on
 274   // DownloadItemImplDelegate::DownloadTargetCallback and
 275   // DownloadManagerDelegate::DownloadTargetCallback having the same
 276   // type.  If the types ever diverge, gasket code will need to
 277   // be written here.
 278   if (!delegate_ || !delegate_->DetermineDownloadTarget(item, callback)) {
 279     base::FilePath target_path = item->GetForcedFilePath();
 280     // TODO(asanka): Determine a useful path if |target_path| is empty.
 281     callback.Run(target_path,
 282                  DownloadItem::TARGET_DISPOSITION_OVERWRITE,
 283                  DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS,
 284                  target_path);
 285   }
 286 }
 287
 288 bool DownloadManagerImpl::ShouldCompleteDownload(
 289     DownloadItemImpl* item, const base::Closure& complete_callback) {
 290   if (!delegate_ ||
 291       delegate_->ShouldCompleteDownload(item, complete_callback)) {
 292     return true;
 293   }
 294   // Otherwise, the delegate has accepted responsibility to run the
 295   // callback when the download is ready for completion.
 296   return false;
 297 }
 298
 299 bool DownloadManagerImpl::ShouldOpenFileBasedOnExtension(
 300     const base::FilePath& path) {
 301   if (!delegate_)
 302     return false;
 303
 304   return delegate_->ShouldOpenFileBasedOnExtension(path);
 305 }
 306
 307 bool DownloadManagerImpl::ShouldOpenDownload(
 308     DownloadItemImpl* item, const ShouldOpenDownloadCallback& callback) {
 309   if (!delegate_)
 310     return true;
 311
 312   // Relies on DownloadItemImplDelegate::ShouldOpenDownloadCallback and
 313   // DownloadManagerDelegate::DownloadOpenDelayedCallback "just happening"
 314   // to have the same type :-}.
 315   return delegate_->ShouldOpenDownload(item, callback);
 316 }
 317
 318 void DownloadManagerImpl::SetDelegate(DownloadManagerDelegate* delegate) {
 319   delegate_ = delegate;
 320 }
 321
 322 DownloadManagerDelegate* DownloadManagerImpl::GetDelegate() const {
 323   return delegate_;
 324 }
 325
 326 void DownloadManagerImpl::Shutdown() {
 327   VLOG(20) << __FUNCTION__ << "()"
 328            << " shutdown_needed_ = " << shutdown_needed_;
 329   if (!shutdown_needed_)
 330     return;
 331   shutdown_needed_ = false;
 332
 333   FOR_EACH_OBSERVER(Observer, observers_, ManagerGoingDown(this));
 334   // TODO(benjhayden): Consider clearing observers_.
 335
 336   // If there are in-progress downloads, cancel them. This also goes for
 337   // dangerous downloads which will remain in history if they aren't explicitly
 338   // accepted or discarded. Canceling will remove the intermediate download
 339   // file.
 340   for (DownloadMap::iterator it = downloads_.begin(); it != downloads_.end();
 341        ++it) {
 342     DownloadItemImpl* download = it->second;
 343     if (download->GetState() == DownloadItem::IN_PROGRESS)
 344       download->Cancel(false);
 345   }
 346   STLDeleteValues(&downloads_);
 347   downloads_.clear();
 348
 349   // We'll have nothing more to report to the observers after this point.
 350   observers_.Clear();
 351
 352   if (delegate_)
 353     delegate_->Shutdown();
 354   delegate_ = NULL;
 355 }
 356
 357 void DownloadManagerImpl::StartDownload(
 358     scoped_ptr<DownloadCreateInfo> info,
 359     scoped_ptr<ByteStreamReader> stream,
 360     const DownloadUrlParameters::OnStartedCallback& on_started) {
 361   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 362   DCHECK(info);
 363   uint32 download_id = info->download_id;
 364   const bool new_download = (download_id == content::DownloadItem::kInvalidId);
 365   base::Callback<void(uint32)> got_id(base::Bind(
 366       &DownloadManagerImpl::StartDownloadWithId,
 367       weak_factory_.GetWeakPtr(),
 368       base::Passed(info.Pass()),
 369       base::Passed(stream.Pass()),
 370       on_started,
 371       new_download));
 372   if (new_download) {
 373     GetNextId(got_id);
 374   } else {
 375     got_id.Run(download_id);
 376   }
 377 }
 378
 379 void DownloadManagerImpl::StartDownloadWithId(
 380     scoped_ptr<DownloadCreateInfo> info,
 381     scoped_ptr<ByteStreamReader> stream,
 382     const DownloadUrlParameters::OnStartedCallback& on_started,
 383     bool new_download,
 384     uint32 id) {
 385   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 386   DCHECK_NE(content::DownloadItem::kInvalidId, id);
 387   DownloadItemImpl* download = NULL;
 388   if (new_download) {
 389     download = CreateActiveItem(id, *info);
 390   } else {
 391     DownloadMap::iterator item_iterator = downloads_.find(id);
 392     // Trying to resume an interrupted download.
 393     if (item_iterator == downloads_.end() ||
 394         (item_iterator->second->GetState() == DownloadItem::CANCELLED)) {
 395       // If the download is no longer known to the DownloadManager, then it was
 396       // removed after it was resumed. Ignore. If the download is cancelled
 397       // while resuming, then also ignore the request.
 398       info->request_handle.CancelRequest();
 399       if (!on_started.is_null())
 400         on_started.Run(NULL, DOWNLOAD_INTERRUPT_REASON_USER_CANCELED);
 401       return;
 402     }
 403     download = item_iterator->second;
 404     DCHECK_EQ(DownloadItem::INTERRUPTED, download->GetState());
 405     download->MergeOriginInfoOnResume(*info);
 406   }
 407
 408   base::FilePath default_download_directory;
 409   if (delegate_) {
 410     base::FilePath website_save_directory;  // Unused
 411     bool skip_dir_check = false;            // Unused
 412     delegate_->GetSaveDir(GetBrowserContext(), &website_save_directory,
 413                           &default_download_directory, &skip_dir_check);
 414   }
 415
 416   // Create the download file and start the download.
 417   scoped_ptr<DownloadFile> download_file(
 418       file_factory_->CreateFile(
 419           info->save_info.Pass(), default_download_directory,
 420           info->url(), info->referrer_url,
 421           delegate_ && delegate_->GenerateFileHash(),
 422           stream.Pass(), download->GetBoundNetLog(),
 423           download->DestinationObserverAsWeakPtr()));
 424
 425   // Attach the client ID identifying the app to the AV system.
 426   if (download_file.get() && delegate_) {
 427     download_file->SetClientGuid(
 428         delegate_->ApplicationClientIdForFileScanning());
 429   }
 430
 431   scoped_ptr<DownloadRequestHandleInterface> req_handle(
 432       new DownloadRequestHandle(info->request_handle));
 433   download->Start(download_file.Pass(), req_handle.Pass());
 434
 435   // For interrupted downloads, Start() will transition the state to
 436   // IN_PROGRESS and consumers will be notified via OnDownloadUpdated().
 437   // For new downloads, we notify here, rather than earlier, so that
 438   // the download_file is bound to download and all the usual
 439   // setters (e.g. Cancel) work.
 440   if (new_download)
 441     FOR_EACH_OBSERVER(Observer, observers_, OnDownloadCreated(this, download));
 442
 443   if (!on_started.is_null())
 444     on_started.Run(download, DOWNLOAD_INTERRUPT_REASON_NONE);
 445 }
 446
 447 void DownloadManagerImpl::CheckForHistoryFilesRemoval() {
 448   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 449   for (DownloadMap::iterator it = downloads_.begin();
 450        it != downloads_.end(); ++it) {
 451     DownloadItemImpl* item = it->second;
 452     CheckForFileRemoval(item);
 453   }
 454 }
 455
 456 void DownloadManagerImpl::CheckForFileRemoval(DownloadItemImpl* download_item) {
 457   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 458   if ((download_item->GetState() == DownloadItem::COMPLETE) &&
 459       !download_item->GetFileExternallyRemoved() &&
 460       delegate_) {
 461     delegate_->CheckForFileExistence(
 462         download_item,
 463         base::Bind(&DownloadManagerImpl::OnFileExistenceChecked,
 464                    weak_factory_.GetWeakPtr(), download_item->GetId()));
 465   }
 466 }
 467
 468 void DownloadManagerImpl::OnFileExistenceChecked(uint32 download_id,
 469                                                  bool result) {
 470   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 471   if (!result) {  // File does not exist.
 472     if (ContainsKey(downloads_, download_id))
 473       downloads_[download_id]->OnDownloadedFileRemoved();
 474   }
 475 }
 476
 477 BrowserContext* DownloadManagerImpl::GetBrowserContext() const {
 478   return browser_context_;
 479 }
 480
 481 void DownloadManagerImpl::CreateSavePackageDownloadItem(
 482     const base::FilePath& main_file_path,
 483     const GURL& page_url,
 484     const std::string& mime_type,
 485     scoped_ptr<DownloadRequestHandleInterface> request_handle,
 486     const DownloadItemImplCreated& item_created) {
 487   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 488   GetNextId(base::Bind(
 489       &DownloadManagerImpl::CreateSavePackageDownloadItemWithId,
 490       weak_factory_.GetWeakPtr(),
 491       main_file_path,
 492       page_url,
 493       mime_type,
 494       base::Passed(request_handle.Pass()),
 495       item_created));
 496 }
 497
 498 void DownloadManagerImpl::CreateSavePackageDownloadItemWithId(
 499     const base::FilePath& main_file_path,
 500     const GURL& page_url,
 501     const std::string& mime_type,
 502     scoped_ptr<DownloadRequestHandleInterface> request_handle,
 503     const DownloadItemImplCreated& item_created,
 504     uint32 id) {
 505   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 506   DCHECK_NE(content::DownloadItem::kInvalidId, id);
 507   DCHECK(!ContainsKey(downloads_, id));
 508   net::BoundNetLog bound_net_log =
 509       net::BoundNetLog::Make(net_log_, net::NetLog::SOURCE_DOWNLOAD);
 510   DownloadItemImpl* download_item = item_factory_->CreateSavePageItem(
 511       this,
 512       id,
 513       main_file_path,
 514       page_url,
 515       mime_type,
 516       request_handle.Pass(),
 517       bound_net_log);
 518   downloads_[download_item->GetId()] = download_item;
 519   FOR_EACH_OBSERVER(Observer, observers_, OnDownloadCreated(
 520       this, download_item));
 521   if (!item_created.is_null())
 522     item_created.Run(download_item);
 523 }
 524
 525 void DownloadManagerImpl::OnSavePackageSuccessfullyFinished(
 526     DownloadItem* download_item) {
 527   FOR_EACH_OBSERVER(Observer, observers_,
 528                     OnSavePackageSuccessfullyFinished(this, download_item));
 529 }
 530
 531 // Resume a download of a specific URL. We send the request to the
 532 // ResourceDispatcherHost, and let it send us responses like a regular
 533 // download.
 534 void DownloadManagerImpl::ResumeInterruptedDownload(
 535     scoped_ptr<content::DownloadUrlParameters> params,
 536     uint32 id) {
 537   RecordDownloadSource(INITIATED_BY_RESUMPTION);
 538   BrowserThread::PostTask(
 539       BrowserThread::IO,
 540       FROM_HERE,
 541       base::Bind(&BeginDownload, base::Passed(&params), id));
 542 }
 543
 544 void DownloadManagerImpl::SetDownloadItemFactoryForTesting(
 545     scoped_ptr<DownloadItemFactory> item_factory) {
 546   item_factory_ = item_factory.Pass();
 547 }
 548
 549 void DownloadManagerImpl::SetDownloadFileFactoryForTesting(
 550     scoped_ptr<DownloadFileFactory> file_factory) {
 551   file_factory_ = file_factory.Pass();
 552 }
 553
 554 DownloadFileFactory* DownloadManagerImpl::GetDownloadFileFactoryForTesting() {
 555   return file_factory_.get();
 556 }
 557
 558 void DownloadManagerImpl::DownloadRemoved(DownloadItemImpl* download) {
 559   if (!download)
 560     return;
 561
 562   uint32 download_id = download->GetId();
 563   if (downloads_.erase(download_id) == 0)
 564     return;
 565   delete download;
 566 }
 567
 568 int DownloadManagerImpl::RemoveDownloadsBetween(base::Time remove_begin,
 569                                                 base::Time remove_end) {
 570   int count = 0;
 571   DownloadMap::const_iterator it = downloads_.begin();
 572   while (it != downloads_.end()) {
 573     DownloadItemImpl* download = it->second;
 574
 575     // Increment done here to protect against invalidation below.
 576     ++it;
 577
 578     if (download->GetStartTime() >= remove_begin &&
 579         (remove_end.is_null() || download->GetStartTime() < remove_end) &&
 580         (download->GetState() != DownloadItem::IN_PROGRESS)) {
 581       // Erases the download from downloads_.
 582       download->Remove();
 583       count++;
 584     }
 585   }
 586   return count;
 587 }
 588
 589 int DownloadManagerImpl::RemoveDownloads(base::Time remove_begin) {
 590   return RemoveDownloadsBetween(remove_begin, base::Time());
 591 }
 592
 593 int DownloadManagerImpl::RemoveAllDownloads() {
 594   // The null times make the date range unbounded.
 595   int num_deleted = RemoveDownloadsBetween(base::Time(), base::Time());
 596   RecordClearAllSize(num_deleted);
 597   return num_deleted;
 598 }
 599
 600 void DownloadManagerImpl::DownloadUrl(
 601     scoped_ptr<DownloadUrlParameters> params) {
 602   if (params->post_id() >= 0) {
 603     // Check this here so that the traceback is more useful.
 604     DCHECK(params->prefer_cache());
 605     DCHECK_EQ("POST", params->method());
 606   }
 607   BrowserThread::PostTask(BrowserThread::IO, FROM_HERE, base::Bind(
 608       &BeginDownload, base::Passed(&params),
 609       content::DownloadItem::kInvalidId));
 610 }
 611
 612 void DownloadManagerImpl::AddObserver(Observer* observer) {
 613   observers_.AddObserver(observer);
 614 }
 615
 616 void DownloadManagerImpl::RemoveObserver(Observer* observer) {
 617   observers_.RemoveObserver(observer);
 618 }
 619
 620 DownloadItem* DownloadManagerImpl::CreateDownloadItem(
 621     uint32 id,
 622     const base::FilePath& current_path,
 623     const base::FilePath& target_path,
 624     const std::vector<GURL>& url_chain,
 625     const GURL& referrer_url,
 626     const std::string& mime_type,
 627     const std::string& original_mime_type,
 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       mime_type,
 650       original_mime_type,
 651       start_time,
 652       end_time,
 653       etag,
 654       last_modified,
 655       received_bytes,
 656       total_bytes,
 657       state,
 658       danger_type,
 659       interrupt_reason,
 660       opened,
 661       net::BoundNetLog::Make(net_log_, net::NetLog::SOURCE_DOWNLOAD));
 662   downloads_[id] = item;
 663   FOR_EACH_OBSERVER(Observer, observers_, OnDownloadCreated(this, item));
 664   VLOG(20) << __FUNCTION__ << "() download = " << item->DebugString(true);
 665   return item;
 666 }
 667
 668 int DownloadManagerImpl::InProgressCount() const {
 669   int count = 0;
 670   for (DownloadMap::const_iterator it = downloads_.begin();
 671        it != downloads_.end(); ++it) {
 672     if (it->second->GetState() == DownloadItem::IN_PROGRESS)
 673       ++count;
 674   }
 675   return count;
 676 }
 677
 678 int DownloadManagerImpl::NonMaliciousInProgressCount() const {
 679   int count = 0;
 680   for (DownloadMap::const_iterator it = downloads_.begin();
 681        it != downloads_.end(); ++it) {
 682     if (it->second->GetState() == DownloadItem::IN_PROGRESS &&
 683         it->second->GetDangerType() != DOWNLOAD_DANGER_TYPE_DANGEROUS_URL &&
 684         it->second->GetDangerType() != DOWNLOAD_DANGER_TYPE_DANGEROUS_CONTENT &&
 685         it->second->GetDangerType() != DOWNLOAD_DANGER_TYPE_DANGEROUS_HOST &&
 686         it->second->GetDangerType() !=
 687             DOWNLOAD_DANGER_TYPE_POTENTIALLY_UNWANTED) {
 688       ++count;
 689     }
 690   }
 691   return count;
 692 }
 693
 694 DownloadItem* DownloadManagerImpl::GetDownload(uint32 download_id) {
 695   return ContainsKey(downloads_, download_id) ? downloads_[download_id] : NULL;
 696 }
 697
 698 void DownloadManagerImpl::GetAllDownloads(DownloadVector* downloads) {
 699   for (DownloadMap::iterator it = downloads_.begin();
 700        it != downloads_.end(); ++it) {
 701     downloads->push_back(it->second);
 702   }
 703 }
 704
 705 void DownloadManagerImpl::OpenDownload(DownloadItemImpl* download) {
 706   int num_unopened = 0;
 707   for (DownloadMap::iterator it = downloads_.begin();
 708        it != downloads_.end(); ++it) {
 709     DownloadItemImpl* item = it->second;
 710     if ((item->GetState() == DownloadItem::COMPLETE) &&
 711         !item->GetOpened())
 712       ++num_unopened;
 713   }
 714   RecordOpensOutstanding(num_unopened);
 715
 716   if (delegate_)
 717     delegate_->OpenDownload(download);
 718 }
 719
 720 void DownloadManagerImpl::ShowDownloadInShell(DownloadItemImpl* download) {
 721   if (delegate_)
 722     delegate_->ShowDownloadInShell(download);
 723 }
 724
 725 }  // namespace content