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