src/webkit/browser/fileapi/copy_or_move_operation_delegate.cc

   1 // Copyright (c) 2013 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 "webkit/browser/fileapi/copy_or_move_operation_delegate.h"
   6
   7 #include "base/bind.h"
   8 #include "base/files/file_path.h"
   9 #include "net/base/io_buffer.h"
  10 #include "net/base/net_errors.h"
  11 #include "webkit/browser/blob/file_stream_reader.h"
  12 #include "webkit/browser/fileapi/copy_or_move_file_validator.h"
  13 #include "webkit/browser/fileapi/file_stream_writer.h"
  14 #include "webkit/browser/fileapi/file_system_context.h"
  15 #include "webkit/browser/fileapi/file_system_operation_runner.h"
  16 #include "webkit/browser/fileapi/file_system_url.h"
  17 #include "webkit/browser/fileapi/recursive_operation_delegate.h"
  18 #include "webkit/common/blob/shareable_file_reference.h"
  19 #include "webkit/common/fileapi/file_system_util.h"
  20
  21 namespace fileapi {
  22
  23 class CopyOrMoveOperationDelegate::CopyOrMoveImpl {
  24  public:
  25   virtual ~CopyOrMoveImpl() {}
  26   virtual void Run(
  27       const CopyOrMoveOperationDelegate::StatusCallback& callback) = 0;
  28   virtual void Cancel() = 0;
  29
  30  protected:
  31   CopyOrMoveImpl() {}
  32
  33  private:
  34   DISALLOW_COPY_AND_ASSIGN(CopyOrMoveImpl);
  35 };
  36
  37 namespace {
  38
  39 // Copies a file on a (same) file system. Just delegate the operation to
  40 // |operation_runner|.
  41 class CopyOrMoveOnSameFileSystemImpl
  42     : public CopyOrMoveOperationDelegate::CopyOrMoveImpl {
  43  public:
  44   CopyOrMoveOnSameFileSystemImpl(
  45       FileSystemOperationRunner* operation_runner,
  46       CopyOrMoveOperationDelegate::OperationType operation_type,
  47       const FileSystemURL& src_url,
  48       const FileSystemURL& dest_url,
  49       CopyOrMoveOperationDelegate::CopyOrMoveOption option,
  50       const FileSystemOperation::CopyFileProgressCallback&
  51           file_progress_callback)
  52       : operation_runner_(operation_runner),
  53         operation_type_(operation_type),
  54         src_url_(src_url),
  55         dest_url_(dest_url),
  56         option_(option),
  57         file_progress_callback_(file_progress_callback) {
  58   }
  59
  60   virtual void Run(
  61       const CopyOrMoveOperationDelegate::StatusCallback& callback) OVERRIDE {
  62     if (operation_type_ == CopyOrMoveOperationDelegate::OPERATION_MOVE) {
  63       operation_runner_->MoveFileLocal(src_url_, dest_url_, option_, callback);
  64     } else {
  65       operation_runner_->CopyFileLocal(
  66           src_url_, dest_url_, option_, file_progress_callback_, callback);
  67     }
  68   }
  69
  70   virtual void Cancel() OVERRIDE {
  71     // We can do nothing for the copy/move operation on a local file system.
  72     // Assuming the operation is quickly done, it should be ok to just wait
  73     // for the completion.
  74   }
  75
  76  private:
  77   FileSystemOperationRunner* operation_runner_;
  78   CopyOrMoveOperationDelegate::OperationType operation_type_;
  79   FileSystemURL src_url_;
  80   FileSystemURL dest_url_;
  81   CopyOrMoveOperationDelegate::CopyOrMoveOption option_;
  82   FileSystemOperation::CopyFileProgressCallback file_progress_callback_;
  83   DISALLOW_COPY_AND_ASSIGN(CopyOrMoveOnSameFileSystemImpl);
  84 };
  85
  86 // Specifically for cross file system copy/move operation, this class creates
  87 // a snapshot file, validates it if necessary, runs copying process,
  88 // validates the created file, and removes source file for move (noop for
  89 // copy).
  90 class SnapshotCopyOrMoveImpl
  91     : public CopyOrMoveOperationDelegate::CopyOrMoveImpl {
  92  public:
  93   SnapshotCopyOrMoveImpl(
  94       FileSystemOperationRunner* operation_runner,
  95       CopyOrMoveOperationDelegate::OperationType operation_type,
  96       const FileSystemURL& src_url,
  97       const FileSystemURL& dest_url,
  98       CopyOrMoveOperationDelegate::CopyOrMoveOption option,
  99       CopyOrMoveFileValidatorFactory* validator_factory,
 100       const FileSystemOperation::CopyFileProgressCallback&
 101           file_progress_callback)
 102       : operation_runner_(operation_runner),
 103         operation_type_(operation_type),
 104         src_url_(src_url),
 105         dest_url_(dest_url),
 106         option_(option),
 107         validator_factory_(validator_factory),
 108         file_progress_callback_(file_progress_callback),
 109         cancel_requested_(false),
 110         weak_factory_(this) {
 111   }
 112
 113   virtual void Run(
 114       const CopyOrMoveOperationDelegate::StatusCallback& callback) OVERRIDE {
 115     file_progress_callback_.Run(0);
 116     operation_runner_->CreateSnapshotFile(
 117         src_url_,
 118         base::Bind(&SnapshotCopyOrMoveImpl::RunAfterCreateSnapshot,
 119                    weak_factory_.GetWeakPtr(), callback));
 120   }
 121
 122   virtual void Cancel() OVERRIDE {
 123     cancel_requested_ = true;
 124   }
 125
 126  private:
 127   void RunAfterCreateSnapshot(
 128       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 129       base::PlatformFileError error,
 130       const base::PlatformFileInfo& file_info,
 131       const base::FilePath& platform_path,
 132       const scoped_refptr<webkit_blob::ShareableFileReference>& file_ref) {
 133     if (cancel_requested_)
 134       error = base::PLATFORM_FILE_ERROR_ABORT;
 135
 136     if (error != base::PLATFORM_FILE_OK) {
 137       callback.Run(error);
 138       return;
 139     }
 140
 141     // For now we assume CreateSnapshotFile always return a valid local file
 142     // path.
 143     DCHECK(!platform_path.empty());
 144
 145     if (!validator_factory_) {
 146       // No validation is needed.
 147       RunAfterPreWriteValidation(platform_path, file_info, file_ref, callback,
 148                                  base::PLATFORM_FILE_OK);
 149       return;
 150     }
 151
 152     // Run pre write validation.
 153     PreWriteValidation(
 154         platform_path,
 155         base::Bind(&SnapshotCopyOrMoveImpl::RunAfterPreWriteValidation,
 156                    weak_factory_.GetWeakPtr(),
 157                    platform_path, file_info, file_ref, callback));
 158   }
 159
 160   void RunAfterPreWriteValidation(
 161       const base::FilePath& platform_path,
 162       const base::PlatformFileInfo& file_info,
 163       const scoped_refptr<webkit_blob::ShareableFileReference>& file_ref,
 164       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 165       base::PlatformFileError error) {
 166     if (cancel_requested_)
 167       error = base::PLATFORM_FILE_ERROR_ABORT;
 168
 169     if (error != base::PLATFORM_FILE_OK) {
 170       callback.Run(error);
 171       return;
 172     }
 173
 174     // |file_ref| is unused but necessary to keep the file alive until
 175     // CopyInForeignFile() is completed.
 176     operation_runner_->CopyInForeignFile(
 177         platform_path, dest_url_,
 178         base::Bind(&SnapshotCopyOrMoveImpl::RunAfterCopyInForeignFile,
 179                    weak_factory_.GetWeakPtr(), file_info, file_ref, callback));
 180   }
 181
 182   void RunAfterCopyInForeignFile(
 183       const base::PlatformFileInfo& file_info,
 184       const scoped_refptr<webkit_blob::ShareableFileReference>& file_ref,
 185       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 186       base::PlatformFileError error) {
 187     if (cancel_requested_)
 188       error = base::PLATFORM_FILE_ERROR_ABORT;
 189
 190     if (error != base::PLATFORM_FILE_OK) {
 191       callback.Run(error);
 192       return;
 193     }
 194
 195     file_progress_callback_.Run(file_info.size);
 196
 197     if (option_ == FileSystemOperation::OPTION_NONE) {
 198       RunAfterTouchFile(callback, base::PLATFORM_FILE_OK);
 199       return;
 200     }
 201
 202     operation_runner_->TouchFile(
 203         dest_url_, base::Time::Now() /* last_access */,
 204         file_info.last_modified,
 205         base::Bind(&SnapshotCopyOrMoveImpl::RunAfterTouchFile,
 206                    weak_factory_.GetWeakPtr(), callback));
 207   }
 208
 209   void RunAfterTouchFile(
 210       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 211       base::PlatformFileError error) {
 212     // Even if TouchFile is failed, just ignore it.
 213
 214     if (cancel_requested_) {
 215       callback.Run(base::PLATFORM_FILE_ERROR_ABORT);
 216       return;
 217     }
 218
 219     // |validator_| is NULL when the destination filesystem does not do
 220     // validation.
 221     if (!validator_) {
 222       // No validation is needed.
 223       RunAfterPostWriteValidation(callback, base::PLATFORM_FILE_OK);
 224       return;
 225     }
 226
 227     PostWriteValidation(
 228         base::Bind(&SnapshotCopyOrMoveImpl::RunAfterPostWriteValidation,
 229                    weak_factory_.GetWeakPtr(), callback));
 230   }
 231
 232   void RunAfterPostWriteValidation(
 233       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 234       base::PlatformFileError error) {
 235     if (cancel_requested_) {
 236       callback.Run(base::PLATFORM_FILE_ERROR_ABORT);
 237       return;
 238     }
 239
 240     if (error != base::PLATFORM_FILE_OK) {
 241       // Failed to validate. Remove the destination file.
 242       operation_runner_->Remove(
 243           dest_url_, true /* recursive */,
 244           base::Bind(&SnapshotCopyOrMoveImpl::DidRemoveDestForError,
 245                      weak_factory_.GetWeakPtr(), error, callback));
 246       return;
 247     }
 248
 249     if (operation_type_ == CopyOrMoveOperationDelegate::OPERATION_COPY) {
 250       callback.Run(base::PLATFORM_FILE_OK);
 251       return;
 252     }
 253
 254     DCHECK_EQ(CopyOrMoveOperationDelegate::OPERATION_MOVE, operation_type_);
 255
 256     // Remove the source for finalizing move operation.
 257     operation_runner_->Remove(
 258         src_url_, true /* recursive */,
 259         base::Bind(&SnapshotCopyOrMoveImpl::RunAfterRemoveSourceForMove,
 260                    weak_factory_.GetWeakPtr(), callback));
 261   }
 262
 263   void RunAfterRemoveSourceForMove(
 264       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 265       base::PlatformFileError error) {
 266     if (cancel_requested_)
 267       error = base::PLATFORM_FILE_ERROR_ABORT;
 268
 269     if (error == base::PLATFORM_FILE_ERROR_NOT_FOUND)
 270       error = base::PLATFORM_FILE_OK;
 271     callback.Run(error);
 272   }
 273
 274   void DidRemoveDestForError(
 275       base::PlatformFileError prior_error,
 276       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 277       base::PlatformFileError error) {
 278     if (error != base::PLATFORM_FILE_OK) {
 279       VLOG(1) << "Error removing destination file after validation error: "
 280               << error;
 281     }
 282     callback.Run(prior_error);
 283   }
 284
 285   // Runs pre-write validation.
 286   void PreWriteValidation(
 287       const base::FilePath& platform_path,
 288       const CopyOrMoveOperationDelegate::StatusCallback& callback) {
 289     DCHECK(validator_factory_);
 290     validator_.reset(
 291         validator_factory_->CreateCopyOrMoveFileValidator(
 292             src_url_, platform_path));
 293     validator_->StartPreWriteValidation(callback);
 294   }
 295
 296   // Runs post-write validation.
 297   void PostWriteValidation(
 298       const CopyOrMoveOperationDelegate::StatusCallback& callback) {
 299     operation_runner_->CreateSnapshotFile(
 300         dest_url_,
 301         base::Bind(
 302             &SnapshotCopyOrMoveImpl::PostWriteValidationAfterCreateSnapshotFile,
 303             weak_factory_.GetWeakPtr(), callback));
 304   }
 305
 306   void PostWriteValidationAfterCreateSnapshotFile(
 307       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 308       base::PlatformFileError error,
 309       const base::PlatformFileInfo& file_info,
 310       const base::FilePath& platform_path,
 311       const scoped_refptr<webkit_blob::ShareableFileReference>& file_ref) {
 312     if (cancel_requested_)
 313       error = base::PLATFORM_FILE_ERROR_ABORT;
 314
 315     if (error != base::PLATFORM_FILE_OK) {
 316       callback.Run(error);
 317       return;
 318     }
 319
 320     DCHECK(validator_);
 321     // Note: file_ref passed here to keep the file alive until after
 322     // the StartPostWriteValidation operation finishes.
 323     validator_->StartPostWriteValidation(
 324         platform_path,
 325         base::Bind(&SnapshotCopyOrMoveImpl::DidPostWriteValidation,
 326                    weak_factory_.GetWeakPtr(), file_ref, callback));
 327   }
 328
 329   // |file_ref| is unused; it is passed here to make sure the reference is
 330   // alive until after post-write validation is complete.
 331   void DidPostWriteValidation(
 332       const scoped_refptr<webkit_blob::ShareableFileReference>& file_ref,
 333       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 334       base::PlatformFileError error) {
 335     callback.Run(error);
 336   }
 337
 338   FileSystemOperationRunner* operation_runner_;
 339   CopyOrMoveOperationDelegate::OperationType operation_type_;
 340   FileSystemURL src_url_;
 341   FileSystemURL dest_url_;
 342
 343   CopyOrMoveOperationDelegate::CopyOrMoveOption option_;
 344   CopyOrMoveFileValidatorFactory* validator_factory_;
 345   scoped_ptr<CopyOrMoveFileValidator> validator_;
 346   FileSystemOperation::CopyFileProgressCallback file_progress_callback_;
 347   bool cancel_requested_;
 348   base::WeakPtrFactory<SnapshotCopyOrMoveImpl> weak_factory_;
 349   DISALLOW_COPY_AND_ASSIGN(SnapshotCopyOrMoveImpl);
 350 };
 351
 352 // The size of buffer for StreamCopyHelper.
 353 const int kReadBufferSize = 32768;
 354
 355 // To avoid too many progress callbacks, it should be called less
 356 // frequently than 50ms.
 357 const int kMinProgressCallbackInvocationSpanInMilliseconds = 50;
 358
 359 // Specifically for cross file system copy/move operation, this class uses
 360 // stream reader and writer for copying. Validator is not supported, so if
 361 // necessary SnapshotCopyOrMoveImpl should be used.
 362 class StreamCopyOrMoveImpl
 363     : public CopyOrMoveOperationDelegate::CopyOrMoveImpl {
 364  public:
 365   StreamCopyOrMoveImpl(
 366       FileSystemOperationRunner* operation_runner,
 367       CopyOrMoveOperationDelegate::OperationType operation_type,
 368       const FileSystemURL& src_url,
 369       const FileSystemURL& dest_url,
 370       CopyOrMoveOperationDelegate::CopyOrMoveOption option,
 371       scoped_ptr<webkit_blob::FileStreamReader> reader,
 372       scoped_ptr<FileStreamWriter> writer,
 373       const FileSystemOperation::CopyFileProgressCallback&
 374           file_progress_callback)
 375       : operation_runner_(operation_runner),
 376         operation_type_(operation_type),
 377         src_url_(src_url),
 378         dest_url_(dest_url),
 379         option_(option),
 380         reader_(reader.Pass()),
 381         writer_(writer.Pass()),
 382         file_progress_callback_(file_progress_callback),
 383         cancel_requested_(false),
 384         weak_factory_(this) {
 385   }
 386
 387   virtual void Run(
 388       const CopyOrMoveOperationDelegate::StatusCallback& callback) OVERRIDE {
 389     // Reader can be created even if the entry does not exist or the entry is
 390     // a directory. To check errors before destination file creation,
 391     // check metadata first.
 392     operation_runner_->GetMetadata(
 393         src_url_,
 394         base::Bind(&StreamCopyOrMoveImpl::RunAfterGetMetadataForSource,
 395                    weak_factory_.GetWeakPtr(), callback));
 396   }
 397
 398   virtual void Cancel() OVERRIDE {
 399     cancel_requested_ = true;
 400     if (copy_helper_)
 401       copy_helper_->Cancel();
 402   }
 403
 404  private:
 405   void RunAfterGetMetadataForSource(
 406       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 407       base::PlatformFileError error,
 408       const base::PlatformFileInfo& file_info) {
 409     if (cancel_requested_)
 410       error = base::PLATFORM_FILE_ERROR_ABORT;
 411
 412     if (error != base::PLATFORM_FILE_OK) {
 413       callback.Run(error);
 414       return;
 415     }
 416
 417     if (file_info.is_directory) {
 418       // If not a directory, failed with appropriate error code.
 419       callback.Run(base::PLATFORM_FILE_ERROR_NOT_A_FILE);
 420       return;
 421     }
 422
 423     // To use FileStreamWriter, we need to ensure the destination file exists.
 424     operation_runner_->CreateFile(
 425         dest_url_, false /* exclusive */,
 426         base::Bind(&StreamCopyOrMoveImpl::RunAfterCreateFileForDestination,
 427                    weak_factory_.GetWeakPtr(),
 428                    callback, file_info.last_modified));
 429   }
 430
 431   void RunAfterCreateFileForDestination(
 432       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 433       const base::Time& last_modified,
 434       base::PlatformFileError error) {
 435     if (cancel_requested_)
 436       error = base::PLATFORM_FILE_ERROR_ABORT;
 437
 438     if (error != base::PLATFORM_FILE_OK) {
 439       callback.Run(error);
 440       return;
 441     }
 442
 443     DCHECK(!copy_helper_);
 444     copy_helper_.reset(
 445         new CopyOrMoveOperationDelegate::StreamCopyHelper(
 446             reader_.Pass(), writer_.Pass(),
 447             kReadBufferSize,
 448             file_progress_callback_,
 449             base::TimeDelta::FromMilliseconds(
 450                 kMinProgressCallbackInvocationSpanInMilliseconds)));
 451     copy_helper_->Run(
 452         base::Bind(&StreamCopyOrMoveImpl::RunAfterStreamCopy,
 453                    weak_factory_.GetWeakPtr(), callback, last_modified));
 454   }
 455
 456   void RunAfterStreamCopy(
 457       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 458       const base::Time& last_modified,
 459       base::PlatformFileError error) {
 460     if (cancel_requested_)
 461       error = base::PLATFORM_FILE_ERROR_ABORT;
 462
 463     if (error != base::PLATFORM_FILE_OK) {
 464       callback.Run(error);
 465       return;
 466     }
 467
 468     if (option_ == FileSystemOperation::OPTION_NONE) {
 469       RunAfterTouchFile(callback, base::PLATFORM_FILE_OK);
 470       return;
 471     }
 472
 473     operation_runner_->TouchFile(
 474         dest_url_, base::Time::Now() /* last_access */, last_modified,
 475         base::Bind(&StreamCopyOrMoveImpl::RunAfterTouchFile,
 476                    weak_factory_.GetWeakPtr(), callback));
 477   }
 478
 479   void RunAfterTouchFile(
 480       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 481       base::PlatformFileError error) {
 482     // Even if TouchFile is failed, just ignore it.
 483     if (cancel_requested_) {
 484       callback.Run(base::PLATFORM_FILE_ERROR_ABORT);
 485       return;
 486     }
 487
 488     if (operation_type_ == CopyOrMoveOperationDelegate::OPERATION_COPY) {
 489       callback.Run(base::PLATFORM_FILE_OK);
 490       return;
 491     }
 492
 493     DCHECK_EQ(CopyOrMoveOperationDelegate::OPERATION_MOVE, operation_type_);
 494
 495     // Remove the source for finalizing move operation.
 496     operation_runner_->Remove(
 497         src_url_, false /* recursive */,
 498         base::Bind(&StreamCopyOrMoveImpl::RunAfterRemoveForMove,
 499                    weak_factory_.GetWeakPtr(), callback));
 500   }
 501
 502   void RunAfterRemoveForMove(
 503       const CopyOrMoveOperationDelegate::StatusCallback& callback,
 504       base::PlatformFileError error) {
 505     if (cancel_requested_)
 506       error = base::PLATFORM_FILE_ERROR_ABORT;
 507     if (error == base::PLATFORM_FILE_ERROR_NOT_FOUND)
 508       error = base::PLATFORM_FILE_OK;
 509     callback.Run(error);
 510   }
 511
 512   FileSystemOperationRunner* operation_runner_;
 513   CopyOrMoveOperationDelegate::OperationType operation_type_;
 514   FileSystemURL src_url_;
 515   FileSystemURL dest_url_;
 516   CopyOrMoveOperationDelegate::CopyOrMoveOption option_;
 517   scoped_ptr<webkit_blob::FileStreamReader> reader_;
 518   scoped_ptr<FileStreamWriter> writer_;
 519   FileSystemOperation::CopyFileProgressCallback file_progress_callback_;
 520   scoped_ptr<CopyOrMoveOperationDelegate::StreamCopyHelper> copy_helper_;
 521   bool cancel_requested_;
 522   base::WeakPtrFactory<StreamCopyOrMoveImpl> weak_factory_;
 523   DISALLOW_COPY_AND_ASSIGN(StreamCopyOrMoveImpl);
 524 };
 525
 526 }  // namespace
 527
 528 CopyOrMoveOperationDelegate::StreamCopyHelper::StreamCopyHelper(
 529     scoped_ptr<webkit_blob::FileStreamReader> reader,
 530     scoped_ptr<FileStreamWriter> writer,
 531     int buffer_size,
 532     const FileSystemOperation::CopyFileProgressCallback&
 533         file_progress_callback,
 534     const base::TimeDelta& min_progress_callback_invocation_span)
 535     : reader_(reader.Pass()),
 536       writer_(writer.Pass()),
 537       file_progress_callback_(file_progress_callback),
 538       io_buffer_(new net::IOBufferWithSize(buffer_size)),
 539       num_copied_bytes_(0),
 540       min_progress_callback_invocation_span_(
 541           min_progress_callback_invocation_span),
 542       cancel_requested_(false),
 543       weak_factory_(this) {
 544 }
 545
 546 CopyOrMoveOperationDelegate::StreamCopyHelper::~StreamCopyHelper() {
 547 }
 548
 549 void CopyOrMoveOperationDelegate::StreamCopyHelper::Run(
 550     const StatusCallback& callback) {
 551   file_progress_callback_.Run(0);
 552   last_progress_callback_invocation_time_ = base::Time::Now();
 553   Read(callback);
 554 }
 555
 556 void CopyOrMoveOperationDelegate::StreamCopyHelper::Cancel() {
 557   cancel_requested_ = true;
 558 }
 559
 560 void CopyOrMoveOperationDelegate::StreamCopyHelper::Read(
 561     const StatusCallback& callback) {
 562   int result = reader_->Read(
 563       io_buffer_.get(), io_buffer_->size(),
 564       base::Bind(&StreamCopyHelper::DidRead,
 565                  weak_factory_.GetWeakPtr(), callback));
 566   if (result != net::ERR_IO_PENDING)
 567     DidRead(callback, result);
 568 }
 569
 570 void CopyOrMoveOperationDelegate::StreamCopyHelper::DidRead(
 571     const StatusCallback& callback, int result) {
 572   if (cancel_requested_) {
 573     callback.Run(base::PLATFORM_FILE_ERROR_ABORT);
 574     return;
 575   }
 576
 577   if (result < 0) {
 578     callback.Run(NetErrorToPlatformFileError(result));
 579     return;
 580   }
 581
 582   if (result == 0) {
 583     // Here is the EOF.
 584     callback.Run(base::PLATFORM_FILE_OK);
 585     return;
 586   }
 587
 588   Write(callback, new net::DrainableIOBuffer(io_buffer_.get(), result));
 589 }
 590
 591 void CopyOrMoveOperationDelegate::StreamCopyHelper::Write(
 592     const StatusCallback& callback,
 593     scoped_refptr<net::DrainableIOBuffer> buffer) {
 594   DCHECK_GT(buffer->BytesRemaining(), 0);
 595
 596   int result = writer_->Write(
 597       buffer.get(), buffer->BytesRemaining(),
 598       base::Bind(&StreamCopyHelper::DidWrite,
 599                  weak_factory_.GetWeakPtr(), callback, buffer));
 600   if (result != net::ERR_IO_PENDING)
 601     DidWrite(callback, buffer, result);
 602 }
 603
 604 void CopyOrMoveOperationDelegate::StreamCopyHelper::DidWrite(
 605     const StatusCallback& callback,
 606     scoped_refptr<net::DrainableIOBuffer> buffer,
 607     int result) {
 608   if (cancel_requested_) {
 609     callback.Run(base::PLATFORM_FILE_ERROR_ABORT);
 610     return;
 611   }
 612
 613   if (result < 0) {
 614     callback.Run(NetErrorToPlatformFileError(result));
 615     return;
 616   }
 617
 618   buffer->DidConsume(result);
 619   num_copied_bytes_ += result;
 620
 621   // Check the elapsed time since last |file_progress_callback_| invocation.
 622   base::Time now = base::Time::Now();
 623   if (now - last_progress_callback_invocation_time_ >=
 624       min_progress_callback_invocation_span_) {
 625     file_progress_callback_.Run(num_copied_bytes_);
 626     last_progress_callback_invocation_time_ = now;
 627   }
 628
 629   if (buffer->BytesRemaining() > 0) {
 630     Write(callback, buffer);
 631     return;
 632   }
 633
 634   Read(callback);
 635 }
 636
 637 CopyOrMoveOperationDelegate::CopyOrMoveOperationDelegate(
 638     FileSystemContext* file_system_context,
 639     const FileSystemURL& src_root,
 640     const FileSystemURL& dest_root,
 641     OperationType operation_type,
 642     CopyOrMoveOption option,
 643     const CopyProgressCallback& progress_callback,
 644     const StatusCallback& callback)
 645     : RecursiveOperationDelegate(file_system_context),
 646       src_root_(src_root),
 647       dest_root_(dest_root),
 648       operation_type_(operation_type),
 649       option_(option),
 650       progress_callback_(progress_callback),
 651       callback_(callback),
 652       weak_factory_(this) {
 653   same_file_system_ = src_root_.IsInSameFileSystem(dest_root_);
 654 }
 655
 656 CopyOrMoveOperationDelegate::~CopyOrMoveOperationDelegate() {
 657   STLDeleteElements(&running_copy_set_);
 658 }
 659
 660 void CopyOrMoveOperationDelegate::Run() {
 661   // Not supported; this should never be called.
 662   NOTREACHED();
 663 }
 664
 665 void CopyOrMoveOperationDelegate::RunRecursively() {
 666   // Perform light-weight checks first.
 667
 668   // It is an error to try to copy/move an entry into its child.
 669   if (same_file_system_ && src_root_.path().IsParent(dest_root_.path())) {
 670     callback_.Run(base::PLATFORM_FILE_ERROR_INVALID_OPERATION);
 671     return;
 672   }
 673
 674   // It is an error to copy/move an entry into the same path.
 675   if (same_file_system_ && src_root_.path() == dest_root_.path()) {
 676     callback_.Run(base::PLATFORM_FILE_ERROR_EXISTS);
 677     return;
 678   }
 679
 680   // Start to process the source directory recursively.
 681   // TODO(kinuko): This could be too expensive for same_file_system_==true
 682   // and operation==MOVE case, probably we can just rename the root directory.
 683   // http://crbug.com/172187
 684   StartRecursiveOperation(src_root_, callback_);
 685 }
 686
 687 void CopyOrMoveOperationDelegate::ProcessFile(
 688     const FileSystemURL& src_url,
 689     const StatusCallback& callback) {
 690   if (!progress_callback_.is_null()) {
 691     progress_callback_.Run(
 692         FileSystemOperation::BEGIN_COPY_ENTRY, src_url, FileSystemURL(), 0);
 693   }
 694
 695   FileSystemURL dest_url = CreateDestURL(src_url);
 696   CopyOrMoveImpl* impl = NULL;
 697   if (same_file_system_) {
 698     impl = new CopyOrMoveOnSameFileSystemImpl(
 699         operation_runner(), operation_type_, src_url, dest_url, option_,
 700         base::Bind(&CopyOrMoveOperationDelegate::OnCopyFileProgress,
 701                    weak_factory_.GetWeakPtr(), src_url));
 702   } else {
 703     // Cross filesystem case.
 704     base::PlatformFileError error = base::PLATFORM_FILE_ERROR_FAILED;
 705     CopyOrMoveFileValidatorFactory* validator_factory =
 706         file_system_context()->GetCopyOrMoveFileValidatorFactory(
 707             dest_root_.type(), &error);
 708     if (error != base::PLATFORM_FILE_OK) {
 709       callback.Run(error);
 710       return;
 711     }
 712
 713     if (!validator_factory) {
 714       scoped_ptr<webkit_blob::FileStreamReader> reader =
 715           file_system_context()->CreateFileStreamReader(
 716               src_url, 0, base::Time());
 717       scoped_ptr<FileStreamWriter> writer =
 718           file_system_context()->CreateFileStreamWriter(dest_url, 0);
 719       if (reader && writer) {
 720         impl = new StreamCopyOrMoveImpl(
 721             operation_runner(), operation_type_, src_url, dest_url, option_,
 722             reader.Pass(), writer.Pass(),
 723             base::Bind(&CopyOrMoveOperationDelegate::OnCopyFileProgress,
 724                        weak_factory_.GetWeakPtr(), src_url));
 725       }
 726     }
 727
 728     if (!impl) {
 729       impl = new SnapshotCopyOrMoveImpl(
 730           operation_runner(), operation_type_, src_url, dest_url, option_,
 731           validator_factory,
 732           base::Bind(&CopyOrMoveOperationDelegate::OnCopyFileProgress,
 733                      weak_factory_.GetWeakPtr(), src_url));
 734     }
 735   }
 736
 737   // Register the running task.
 738   running_copy_set_.insert(impl);
 739   impl->Run(base::Bind(
 740       &CopyOrMoveOperationDelegate::DidCopyOrMoveFile,
 741       weak_factory_.GetWeakPtr(), src_url, dest_url, callback, impl));
 742 }
 743
 744 void CopyOrMoveOperationDelegate::ProcessDirectory(
 745     const FileSystemURL& src_url,
 746     const StatusCallback& callback) {
 747   if (src_url == src_root_) {
 748     // The src_root_ looks to be a directory.
 749     // Try removing the dest_root_ to see if it exists and/or it is an
 750     // empty directory.
 751     // We do not invoke |progress_callback_| for source root, because it is
 752     // already called in ProcessFile().
 753     operation_runner()->RemoveDirectory(
 754         dest_root_,
 755         base::Bind(&CopyOrMoveOperationDelegate::DidTryRemoveDestRoot,
 756                    weak_factory_.GetWeakPtr(), callback));
 757     return;
 758   }
 759
 760   if (!progress_callback_.is_null()) {
 761     progress_callback_.Run(
 762         FileSystemOperation::BEGIN_COPY_ENTRY, src_url, FileSystemURL(), 0);
 763   }
 764
 765   ProcessDirectoryInternal(src_url, CreateDestURL(src_url), callback);
 766 }
 767
 768 void CopyOrMoveOperationDelegate::PostProcessDirectory(
 769     const FileSystemURL& src_url,
 770     const StatusCallback& callback) {
 771   if (option_ == FileSystemOperation::OPTION_NONE) {
 772     PostProcessDirectoryAfterTouchFile(
 773         src_url, callback, base::PLATFORM_FILE_OK);
 774     return;
 775   }
 776
 777   operation_runner()->GetMetadata(
 778       src_url,
 779       base::Bind(
 780           &CopyOrMoveOperationDelegate::PostProcessDirectoryAfterGetMetadata,
 781           weak_factory_.GetWeakPtr(), src_url, callback));
 782 }
 783
 784 void CopyOrMoveOperationDelegate::OnCancel() {
 785   // Request to cancel all running Copy/Move file.
 786   for (std::set<CopyOrMoveImpl*>::iterator iter = running_copy_set_.begin();
 787        iter != running_copy_set_.end(); ++iter)
 788     (*iter)->Cancel();
 789 }
 790
 791 void CopyOrMoveOperationDelegate::DidCopyOrMoveFile(
 792     const FileSystemURL& src_url,
 793     const FileSystemURL& dest_url,
 794     const StatusCallback& callback,
 795     CopyOrMoveImpl* impl,
 796     base::PlatformFileError error) {
 797   running_copy_set_.erase(impl);
 798   delete impl;
 799
 800   if (!progress_callback_.is_null() && error == base::PLATFORM_FILE_OK) {
 801     progress_callback_.Run(
 802         FileSystemOperation::END_COPY_ENTRY, src_url, dest_url, 0);
 803   }
 804
 805   callback.Run(error);
 806 }
 807
 808 void CopyOrMoveOperationDelegate::DidTryRemoveDestRoot(
 809     const StatusCallback& callback,
 810     base::PlatformFileError error) {
 811   if (error == base::PLATFORM_FILE_ERROR_NOT_A_DIRECTORY) {
 812     callback_.Run(base::PLATFORM_FILE_ERROR_INVALID_OPERATION);
 813     return;
 814   }
 815   if (error != base::PLATFORM_FILE_OK &&
 816       error != base::PLATFORM_FILE_ERROR_NOT_FOUND) {
 817     callback_.Run(error);
 818     return;
 819   }
 820
 821   ProcessDirectoryInternal(src_root_, dest_root_, callback);
 822 }
 823
 824 void CopyOrMoveOperationDelegate::ProcessDirectoryInternal(
 825     const FileSystemURL& src_url,
 826     const FileSystemURL& dest_url,
 827     const StatusCallback& callback) {
 828   // If operation_type == Move we may need to record directories and
 829   // restore directory timestamps in the end, though it may have
 830   // negative performance impact.
 831   // See http://crbug.com/171284 for more details.
 832   operation_runner()->CreateDirectory(
 833       dest_url, false /* exclusive */, false /* recursive */,
 834       base::Bind(&CopyOrMoveOperationDelegate::DidCreateDirectory,
 835                  weak_factory_.GetWeakPtr(), src_url, dest_url, callback));
 836 }
 837
 838 void CopyOrMoveOperationDelegate::DidCreateDirectory(
 839     const FileSystemURL& src_url,
 840     const FileSystemURL& dest_url,
 841     const StatusCallback& callback,
 842     base::PlatformFileError error) {
 843   if (!progress_callback_.is_null() && error == base::PLATFORM_FILE_OK) {
 844     progress_callback_.Run(
 845         FileSystemOperation::END_COPY_ENTRY, src_url, dest_url, 0);
 846   }
 847
 848   callback.Run(error);
 849 }
 850
 851 void CopyOrMoveOperationDelegate::PostProcessDirectoryAfterGetMetadata(
 852     const FileSystemURL& src_url,
 853     const StatusCallback& callback,
 854     base::PlatformFileError error,
 855     const base::PlatformFileInfo& file_info) {
 856   if (error != base::PLATFORM_FILE_OK) {
 857     // Ignore the error, and run post process which should run after TouchFile.
 858     PostProcessDirectoryAfterTouchFile(
 859         src_url, callback, base::PLATFORM_FILE_OK);
 860     return;
 861   }
 862
 863   operation_runner()->TouchFile(
 864       CreateDestURL(src_url), base::Time::Now() /* last access */,
 865       file_info.last_modified,
 866       base::Bind(
 867           &CopyOrMoveOperationDelegate::PostProcessDirectoryAfterTouchFile,
 868           weak_factory_.GetWeakPtr(), src_url, callback));
 869 }
 870
 871 void CopyOrMoveOperationDelegate::PostProcessDirectoryAfterTouchFile(
 872     const FileSystemURL& src_url,
 873     const StatusCallback& callback,
 874     base::PlatformFileError error) {
 875   // Even if the TouchFile is failed, just ignore it.
 876
 877   if (operation_type_ == OPERATION_COPY) {
 878     callback.Run(base::PLATFORM_FILE_OK);
 879     return;
 880   }
 881
 882   DCHECK_EQ(OPERATION_MOVE, operation_type_);
 883
 884   // All files and subdirectories in the directory should be moved here,
 885   // so remove the source directory for finalizing move operation.
 886   operation_runner()->Remove(
 887       src_url, false /* recursive */,
 888       base::Bind(&CopyOrMoveOperationDelegate::DidRemoveSourceForMove,
 889                  weak_factory_.GetWeakPtr(), callback));
 890 }
 891
 892 void CopyOrMoveOperationDelegate::DidRemoveSourceForMove(
 893     const StatusCallback& callback,
 894     base::PlatformFileError error) {
 895   if (error == base::PLATFORM_FILE_ERROR_NOT_FOUND)
 896     error = base::PLATFORM_FILE_OK;
 897   callback.Run(error);
 898 }
 899
 900 void CopyOrMoveOperationDelegate::OnCopyFileProgress(
 901     const FileSystemURL& src_url, int64 size) {
 902   if (!progress_callback_.is_null()) {
 903     progress_callback_.Run(
 904         FileSystemOperation::PROGRESS, src_url, FileSystemURL(), size);
 905   }
 906 }
 907
 908 FileSystemURL CopyOrMoveOperationDelegate::CreateDestURL(
 909     const FileSystemURL& src_url) const {
 910   DCHECK_EQ(src_root_.type(), src_url.type());
 911   DCHECK_EQ(src_root_.origin(), src_url.origin());
 912
 913   base::FilePath relative = dest_root_.virtual_path();
 914   src_root_.virtual_path().AppendRelativePath(src_url.virtual_path(),
 915                                               &relative);
 916   return file_system_context()->CreateCrackedFileSystemURL(
 917       dest_root_.origin(),
 918       dest_root_.mount_type(),
 919       relative);
 920 }
 921
 922 }  // namespace fileapi