content/browser/download/download_item_impl.h

   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 #ifndef CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_ITEM_IMPL_H_
   6 #define CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_ITEM_IMPL_H_
   7
   8 #include <string>
   9
  10 #include "base/basictypes.h"
  11 #include "base/callback_forward.h"
  12 #include "base/files/file_path.h"
  13 #include "base/memory/scoped_ptr.h"
  14 #include "base/memory/weak_ptr.h"
  15 #include "base/observer_list.h"
  16 #include "base/time/time.h"
  17 #include "content/browser/download/download_net_log_parameters.h"
  18 #include "content/browser/download/download_request_handle.h"
  19 #include "content/common/content_export.h"
  20 #include "content/public/browser/download_destination_observer.h"
  21 #include "content/public/browser/download_interrupt_reasons.h"
  22 #include "content/public/browser/download_item.h"
  23 #include "net/log/net_log.h"
  24 #include "url/gurl.h"
  25
  26 namespace content {
  27 class DownloadFile;
  28 class DownloadItemImplDelegate;
  29
  30 // See download_item.h for usage.
  31 class CONTENT_EXPORT DownloadItemImpl
  32     : public DownloadItem,
  33       public DownloadDestinationObserver {
  34  public:
  35   enum ResumeMode {
  36     RESUME_MODE_INVALID = 0,
  37     RESUME_MODE_IMMEDIATE_CONTINUE,
  38     RESUME_MODE_IMMEDIATE_RESTART,
  39     RESUME_MODE_USER_CONTINUE,
  40     RESUME_MODE_USER_RESTART
  41   };
  42
  43   // The maximum number of attempts we will make to resume automatically.
  44   static const int kMaxAutoResumeAttempts;
  45
  46   // Note that it is the responsibility of the caller to ensure that a
  47   // DownloadItemImplDelegate passed to a DownloadItemImpl constructor
  48   // outlives the DownloadItemImpl.
  49
  50   // Constructing from persistent store:
  51   // |bound_net_log| is constructed externally for our use.
  52   DownloadItemImpl(DownloadItemImplDelegate* delegate,
  53                    uint32 id,
  54                    const base::FilePath& current_path,
  55                    const base::FilePath& target_path,
  56                    const std::vector<GURL>& url_chain,
  57                    const GURL& referrer_url,
  58                    const std::string& mime_type,
  59                    const std::string& original_mime_type,
  60                    const base::Time& start_time,
  61                    const base::Time& end_time,
  62                    const std::string& etag,
  63                    const std::string& last_modified,
  64                    int64 received_bytes,
  65                    int64 total_bytes,
  66                    DownloadItem::DownloadState state,
  67                    DownloadDangerType danger_type,
  68                    DownloadInterruptReason interrupt_reason,
  69                    bool opened,
  70                    const net::BoundNetLog& bound_net_log);
  71
  72   // Constructing for a regular download.
  73   // |bound_net_log| is constructed externally for our use.
  74   DownloadItemImpl(DownloadItemImplDelegate* delegate,
  75                    uint32 id,
  76                    const DownloadCreateInfo& info,
  77                    const net::BoundNetLog& bound_net_log);
  78
  79   // Constructing for the "Save Page As..." feature:
  80   // |bound_net_log| is constructed externally for our use.
  81   DownloadItemImpl(DownloadItemImplDelegate* delegate,
  82                    uint32 id,
  83                    const base::FilePath& path,
  84                    const GURL& url,
  85                    const std::string& mime_type,
  86                    scoped_ptr<DownloadRequestHandleInterface> request_handle,
  87                    const net::BoundNetLog& bound_net_log);
  88
  89   ~DownloadItemImpl() override;
  90
  91   // DownloadItem
  92   void AddObserver(DownloadItem::Observer* observer) override;
  93   void RemoveObserver(DownloadItem::Observer* observer) override;
  94   void UpdateObservers() override;
  95   void ValidateDangerousDownload() override;
  96   void StealDangerousDownload(const AcquireFileCallback& callback) override;
  97   void Pause() override;
  98   void Resume() override;
  99   void Cancel(bool user_cancel) override;
 100   void Remove() override;
 101   void OpenDownload() override;
 102   void ShowDownloadInShell() override;
 103   uint32 GetId() const override;
 104   DownloadState GetState() const override;
 105   DownloadInterruptReason GetLastReason() const override;
 106   bool IsPaused() const override;
 107   bool IsTemporary() const override;
 108   bool CanResume() const override;
 109   bool IsDone() const override;
 110   const GURL& GetURL() const override;
 111   const std::vector<GURL>& GetUrlChain() const override;
 112   const GURL& GetOriginalUrl() const override;
 113   const GURL& GetReferrerUrl() const override;
 114   const GURL& GetTabUrl() const override;
 115   const GURL& GetTabReferrerUrl() const override;
 116   std::string GetSuggestedFilename() const override;
 117   std::string GetContentDisposition() const override;
 118   std::string GetMimeType() const override;
 119   std::string GetOriginalMimeType() const override;
 120   std::string GetRemoteAddress() const override;
 121   bool HasUserGesture() const override;
 122   ui::PageTransition GetTransitionType() const override;
 123   const std::string& GetLastModifiedTime() const override;
 124   const std::string& GetETag() const override;
 125   bool IsSavePackageDownload() const override;
 126   const base::FilePath& GetFullPath() const override;
 127   const base::FilePath& GetTargetFilePath() const override;
 128   const base::FilePath& GetForcedFilePath() const override;
 129   base::FilePath GetFileNameToReportUser() const override;
 130   TargetDisposition GetTargetDisposition() const override;
 131   const std::string& GetHash() const override;
 132   const std::string& GetHashState() const override;
 133   bool GetFileExternallyRemoved() const override;
 134   void DeleteFile(const base::Callback<void(bool)>& callback) override;
 135   bool IsDangerous() const override;
 136   DownloadDangerType GetDangerType() const override;
 137   bool TimeRemaining(base::TimeDelta* remaining) const override;
 138   int64 CurrentSpeed() const override;
 139   int PercentComplete() const override;
 140   bool AllDataSaved() const override;
 141   int64 GetTotalBytes() const override;
 142   int64 GetReceivedBytes() const override;
 143   base::Time GetStartTime() const override;
 144   base::Time GetEndTime() const override;
 145   bool CanShowInFolder() override;
 146   bool CanOpenDownload() override;
 147   bool ShouldOpenFileBasedOnExtension() override;
 148   bool GetOpenWhenComplete() const override;
 149   bool GetAutoOpened() override;
 150   bool GetOpened() const override;
 151   BrowserContext* GetBrowserContext() const override;
 152   WebContents* GetWebContents() const override;
 153   void OnContentCheckCompleted(DownloadDangerType danger_type) override;
 154   void SetOpenWhenComplete(bool open) override;
 155   void SetIsTemporary(bool temporary) override;
 156   void SetOpened(bool opened) override;
 157   void SetDisplayName(const base::FilePath& name) override;
 158   std::string DebugString(bool verbose) const override;
 159
 160   // All remaining public interfaces virtual to allow for DownloadItemImpl
 161   // mocks.
 162
 163   // Determines the resume mode for an interrupted download. Requires
 164   // last_reason_ to be set, but doesn't require the download to be in
 165   // INTERRUPTED state.
 166   virtual ResumeMode GetResumeMode() const;
 167
 168   // Notify the download item that new origin information is available due to a
 169   // resumption request receiving a response.
 170   virtual void MergeOriginInfoOnResume(
 171       const DownloadCreateInfo& new_create_info);
 172
 173   // State transition operations on regular downloads --------------------------
 174
 175   // Start the download.
 176   // |download_file| is the associated file on the storage medium.
 177   // |req_handle| is the new request handle associated with the download.
 178   virtual void Start(scoped_ptr<DownloadFile> download_file,
 179                      scoped_ptr<DownloadRequestHandleInterface> req_handle);
 180
 181   // Needed because of intertwining with DownloadManagerImpl -------------------
 182
 183   // TODO(rdsmith): Unwind DownloadManagerImpl and DownloadItemImpl,
 184   // removing these from the public interface.
 185
 186   // Notify observers that this item is being removed by the user.
 187   virtual void NotifyRemoved();
 188
 189   virtual void OnDownloadedFileRemoved();
 190
 191   // Provide a weak pointer reference to a DownloadDestinationObserver
 192   // for use by download destinations.
 193   virtual base::WeakPtr<DownloadDestinationObserver>
 194       DestinationObserverAsWeakPtr();
 195
 196   // Get the download's BoundNetLog.
 197   virtual const net::BoundNetLog& GetBoundNetLog() const;
 198
 199   // DownloadItemImpl routines only needed by SavePackage ----------------------
 200
 201   // Called by SavePackage to set the total number of bytes on the item.
 202   virtual void SetTotalBytes(int64 total_bytes);
 203
 204   virtual void OnAllDataSaved(const std::string& final_hash);
 205
 206   // Called by SavePackage to display progress when the DownloadItem
 207   // should be considered complete.
 208   virtual void MarkAsComplete();
 209
 210   // DownloadDestinationObserver
 211   void DestinationUpdate(int64 bytes_so_far,
 212                          int64 bytes_per_sec,
 213                          const std::string& hash_state) override;
 214   void DestinationError(DownloadInterruptReason reason) override;
 215   void DestinationCompleted(const std::string& final_hash) override;
 216
 217  private:
 218   // Fine grained states of a download. Note that active downloads are created
 219   // in IN_PROGRESS_INTERNAL state. However, downloads creates via history can
 220   // be created in COMPLETE_INTERNAL, CANCELLED_INTERNAL and
 221   // INTERRUPTED_INTERNAL.
 222
 223   enum DownloadInternalState {
 224     // Includes both before and after file name determination, and paused
 225     // downloads.
 226     // TODO(rdsmith): Put in state variable for file name determination.
 227     // Transitions from:
 228     //   <Initial creation>    Active downloads are created in this state.
 229     //   RESUMING_INTERNAL
 230     // Transitions to:
 231     //   COMPLETING_INTERNAL   On final rename completion.
 232     //   CANCELLED_INTERNAL    On cancel.
 233     //   INTERRUPTED_INTERNAL  On interrupt.
 234     //   COMPLETE_INTERNAL     On SavePackage download completion.
 235     IN_PROGRESS_INTERNAL,
 236
 237     // Between commit point (dispatch of download file release) and completed.
 238     // Embedder may be opening the file in this state.
 239     // Transitions from:
 240     //   IN_PROGRESS_INTERNAL
 241     // Transitions to:
 242     //   COMPLETE_INTERNAL     On successful completion.
 243     COMPLETING_INTERNAL,
 244
 245     // After embedder has had a chance to auto-open.  User may now open
 246     // or auto-open based on extension.
 247     // Transitions from:
 248     //   COMPLETING_INTERNAL
 249     //   IN_PROGRESS_INTERNAL  SavePackage only.
 250     //   <Initial creation>    Completed persisted downloads.
 251     // Transitions to:
 252     //   <none>                Terminal state.
 253     COMPLETE_INTERNAL,
 254
 255     // User has cancelled the download.
 256     // Transitions from:
 257     //   IN_PROGRESS_INTERNAL
 258     //   INTERRUPTED_INTERNAL
 259     //   RESUMING_INTERNAL
 260     //   <Initial creation>    Canceleld persisted downloads.
 261     // Transitions to:
 262     //   <none>                Terminal state.
 263     CANCELLED_INTERNAL,
 264
 265     // An error has interrupted the download.
 266     // Transitions from:
 267     //   IN_PROGRESS_INTERNAL
 268     //   RESUMING_INTERNAL
 269     //   <Initial creation>    Interrupted persisted downloads.
 270     // Transitions to:
 271     //   RESUMING_INTERNAL     On resumption.
 272     INTERRUPTED_INTERNAL,
 273
 274     // A request to resume this interrupted download is in progress.
 275     // Transitions from:
 276     //   INTERRUPTED_INTERNAL
 277     // Transitions to:
 278     //   IN_PROGRESS_INTERNAL  Once a server response is received from a
 279     //                         resumption.
 280     //   INTERRUPTED_INTERNAL  If the resumption request fails.
 281     //   CANCELLED_INTERNAL    On cancel.
 282     RESUMING_INTERNAL,
 283
 284     MAX_DOWNLOAD_INTERNAL_STATE,
 285   };
 286
 287   // Used with TransitionTo() to indicate whether or not to call
 288   // UpdateObservers() after the state transition.
 289   enum ShouldUpdateObservers {
 290     UPDATE_OBSERVERS,
 291     DONT_UPDATE_OBSERVERS
 292   };
 293
 294   // Normal progression of a download ------------------------------------------
 295
 296   // These are listed in approximately chronological order.  There are also
 297   // public methods involved in normal download progression; see
 298   // the implementation ordering in download_item_impl.cc.
 299
 300   // Construction common to all constructors. |active| should be true for new
 301   // downloads and false for downloads from the history.
 302   // |download_type| indicates to the net log system what kind of download
 303   // this is.
 304   void Init(bool active, DownloadType download_type);
 305
 306   // Called when the target path has been determined. |target_path| is the
 307   // suggested target path. |disposition| indicates how the target path should
 308   // be used (see TargetDisposition). |danger_type| is the danger level of
 309   // |target_path| as determined by the caller. |intermediate_path| is the path
 310   // to use to store the download until OnDownloadCompleting() is called.
 311   virtual void OnDownloadTargetDetermined(
 312       const base::FilePath& target_path,
 313       TargetDisposition disposition,
 314       DownloadDangerType danger_type,
 315       const base::FilePath& intermediate_path);
 316
 317   // Callback from file thread when we initialize the DownloadFile.
 318   void OnDownloadFileInitialized(DownloadInterruptReason result);
 319
 320   void OnDownloadRenamedToIntermediateName(
 321       DownloadInterruptReason reason, const base::FilePath& full_path);
 322
 323   // If all pre-requisites have been met, complete download processing, i.e. do
 324   // internal cleanup, file rename, and potentially auto-open.  (Dangerous
 325   // downloads still may block on user acceptance after this point.)
 326   void MaybeCompleteDownload();
 327
 328   // Called when the download is ready to complete.
 329   // This may perform final rename if necessary and will eventually call
 330   // DownloadItem::Completed().
 331   void OnDownloadCompleting();
 332
 333   void OnDownloadRenamedToFinalName(DownloadInterruptReason reason,
 334                                     const base::FilePath& full_path);
 335
 336   // Called if the embedder took over opening a download, to indicate that
 337   // the download has been opened.
 338   void DelayedDownloadOpened(bool auto_opened);
 339
 340   // Called when the entire download operation (including renaming etc)
 341   // is completed.
 342   void Completed();
 343
 344   // Callback invoked when the URLRequest for a download resumption has started.
 345   void OnResumeRequestStarted(DownloadItem* item,
 346                               DownloadInterruptReason interrupt_reason);
 347
 348   // Helper routines -----------------------------------------------------------
 349
 350   // Indicate that an error has occurred on the download.
 351   void Interrupt(DownloadInterruptReason reason);
 352
 353   // Destroy the DownloadFile object.  If |destroy_file| is true, the file is
 354   // destroyed with it.  Otherwise, DownloadFile::Detach() is called before
 355   // object destruction to prevent file destruction. Destroying the file also
 356   // resets |current_path_|.
 357   void ReleaseDownloadFile(bool destroy_file);
 358
 359   // Check if a download is ready for completion.  The callback provided
 360   // may be called at some point in the future if an external entity
 361   // state has change s.t. this routine should be checked again.
 362   bool IsDownloadReadyForCompletion(const base::Closure& state_change_notify);
 363
 364   // Call to transition state; all state transitions should go through this.
 365   // |notify_action| specifies whether or not to call UpdateObservers() after
 366   // the state transition.
 367   void TransitionTo(DownloadInternalState new_state,
 368                     ShouldUpdateObservers notify_action);
 369
 370   // Set the |danger_type_| and invoke obserers if necessary.
 371   void SetDangerType(DownloadDangerType danger_type);
 372
 373   void SetFullPath(const base::FilePath& new_path);
 374
 375   void AutoResumeIfValid();
 376
 377   void ResumeInterruptedDownload();
 378
 379   static DownloadState InternalToExternalState(
 380       DownloadInternalState internal_state);
 381   static DownloadInternalState ExternalToInternalState(
 382       DownloadState external_state);
 383
 384   // Debugging routines --------------------------------------------------------
 385   static const char* DebugDownloadStateString(DownloadInternalState state);
 386   static const char* DebugResumeModeString(ResumeMode mode);
 387
 388   // Will be false for save package downloads retrieved from the history.
 389   // TODO(rdsmith): Replace with a generalized enum for "download source".
 390   const bool is_save_package_download_;
 391
 392   // The handle to the request information.  Used for operations outside the
 393   // download system.
 394   scoped_ptr<DownloadRequestHandleInterface> request_handle_;
 395
 396   uint32 download_id_;
 397
 398   // Display name for the download. If this is empty, then the display name is
 399   // considered to be |target_path_.BaseName()|.
 400   base::FilePath display_name_;
 401
 402   // Full path to the downloaded or downloading file. This is the path to the
 403   // physical file, if one exists. The final target path is specified by
 404   // |target_path_|. |current_path_| can be empty if the in-progress path hasn't
 405   // been determined.
 406   base::FilePath current_path_;
 407
 408   // Target path of an in-progress download. We may be downloading to a
 409   // temporary or intermediate file (specified by |current_path_|.  Once the
 410   // download completes, we will rename the file to |target_path_|.
 411   base::FilePath target_path_;
 412
 413   // Whether the target should be overwritten, uniquified or prompted for.
 414   TargetDisposition target_disposition_;
 415
 416   // The chain of redirects that leading up to and including the final URL.
 417   std::vector<GURL> url_chain_;
 418
 419   // The URL of the page that initiated the download.
 420   GURL referrer_url_;
 421
 422   // The URL of the tab that initiated the download.
 423   GURL tab_url_;
 424
 425   // The URL of the referrer of the tab that initiated the download.
 426   GURL tab_referrer_url_;
 427
 428   // Filename suggestion from DownloadSaveInfo. It could, among others, be the
 429   // suggested filename in 'download' attribute of an anchor. Details:
 430   // http://www.whatwg.org/specs/web-apps/current-work/#downloading-hyperlinks
 431   std::string suggested_filename_;
 432
 433   // If non-empty, contains an externally supplied path that should be used as
 434   // the target path.
 435   base::FilePath forced_file_path_;
 436
 437   // Page transition that triggerred the download.
 438   ui::PageTransition transition_type_;
 439
 440   // Whether the download was triggered with a user gesture.
 441   bool has_user_gesture_;
 442
 443   // Information from the request.
 444   // Content-disposition field from the header.
 445   std::string content_disposition_;
 446
 447   // Mime-type from the header.  Subject to change.
 448   std::string mime_type_;
 449
 450   // The value of the content type header sent with the downloaded item.  It
 451   // may be different from |mime_type_|, which may be set based on heuristics
 452   // which may look at the file extension and first few bytes of the file.
 453   std::string original_mime_type_;
 454
 455   // The remote IP address where the download was fetched from.  Copied from
 456   // DownloadCreateInfo::remote_address.
 457   std::string remote_address_;
 458
 459   // Total bytes expected.
 460   int64 total_bytes_;
 461
 462   // Current received bytes.
 463   int64 received_bytes_;
 464
 465   // Current speed. Calculated by the DownloadFile.
 466   int64 bytes_per_sec_;
 467
 468   // Sha256 hash of the content.  This might be empty either because
 469   // the download isn't done yet or because the hash isn't needed
 470   // (ChromeDownloadManagerDelegate::GenerateFileHash() returned false).
 471   std::string hash_;
 472
 473   // A blob containing the state of the hash algorithm.  Only valid while the
 474   // download is in progress.
 475   std::string hash_state_;
 476
 477   // Server's time stamp for the file.
 478   std::string last_modified_time_;
 479
 480   // Server's ETAG for the file.
 481   std::string etag_;
 482
 483   // Last reason.
 484   DownloadInterruptReason last_reason_;
 485
 486   // Start time for recording statistics.
 487   base::TimeTicks start_tick_;
 488
 489   // The current state of this download.
 490   DownloadInternalState state_;
 491
 492   // Current danger type for the download.
 493   DownloadDangerType danger_type_;
 494
 495   // The views of this item in the download shelf and download contents.
 496   ObserverList<Observer> observers_;
 497
 498   // Time the download was started.
 499   base::Time start_time_;
 500
 501   // Time the download completed.
 502   base::Time end_time_;
 503
 504   // Our delegate.
 505   DownloadItemImplDelegate* delegate_;
 506
 507   // In progress downloads may be paused by the user, we note it here.
 508   bool is_paused_;
 509
 510   // The number of times this download has been resumed automatically.
 511   int auto_resume_count_;
 512
 513   // A flag for indicating if the download should be opened at completion.
 514   bool open_when_complete_;
 515
 516   // A flag for indicating if the downloaded file is externally removed.
 517   bool file_externally_removed_;
 518
 519   // True if the download was auto-opened. We set this rather than using
 520   // an observer as it's frequently possible for the download to be auto opened
 521   // before the observer is added.
 522   bool auto_opened_;
 523
 524   // True if the item was downloaded temporarily.
 525   bool is_temporary_;
 526
 527   // True if we've saved all the data for the download.
 528   bool all_data_saved_;
 529
 530   // Error return from DestinationError.  Stored separately from
 531   // last_reason_ so that we can avoid handling destination errors until
 532   // after file name determination has occurred.
 533   DownloadInterruptReason destination_error_;
 534
 535   // Did the user open the item either directly or indirectly (such as by
 536   // setting always open files of this type)? The shelf also sets this field
 537   // when the user closes the shelf before the item has been opened but should
 538   // be treated as though the user opened it.
 539   bool opened_;
 540
 541   // Did the delegate delay calling Complete on this download?
 542   bool delegate_delayed_complete_;
 543
 544   // DownloadFile associated with this download.  Note that this
 545   // pointer may only be used or destroyed on the FILE thread.
 546   // This pointer will be non-null only while the DownloadItem is in
 547   // the IN_PROGRESS state.
 548   scoped_ptr<DownloadFile> download_file_;
 549
 550   // Net log to use for this download.
 551   const net::BoundNetLog bound_net_log_;
 552
 553   base::WeakPtrFactory<DownloadItemImpl> weak_ptr_factory_;
 554
 555   DISALLOW_COPY_AND_ASSIGN(DownloadItemImpl);
 556 };
 557
 558 }  // namespace content
 559
 560 #endif  // CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_ITEM_IMPL_H_