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      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 "webkit/browser/fileapi/isolated_file_system_backend.h"
      6 
      7 #include <string>
      8 
      9 #include "base/bind.h"
     10 #include "base/files/file_path.h"
     11 #include "base/files/file_util_proxy.h"
     12 #include "base/logging.h"
     13 #include "base/message_loop/message_loop_proxy.h"
     14 #include "base/platform_file.h"
     15 #include "base/sequenced_task_runner.h"
     16 #include "webkit/browser/blob/file_stream_reader.h"
     17 #include "webkit/browser/fileapi/async_file_util_adapter.h"
     18 #include "webkit/browser/fileapi/copy_or_move_file_validator.h"
     19 #include "webkit/browser/fileapi/dragged_file_util.h"
     20 #include "webkit/browser/fileapi/file_stream_writer.h"
     21 #include "webkit/browser/fileapi/file_system_context.h"
     22 #include "webkit/browser/fileapi/file_system_operation.h"
     23 #include "webkit/browser/fileapi/file_system_operation_context.h"
     24 #include "webkit/browser/fileapi/isolated_context.h"
     25 #include "webkit/browser/fileapi/native_file_util.h"
     26 #include "webkit/browser/fileapi/transient_file_util.h"
     27 #include "webkit/common/fileapi/file_system_types.h"
     28 #include "webkit/common/fileapi/file_system_util.h"
     29 
     30 namespace fileapi {
     31 
     32 IsolatedFileSystemBackend::IsolatedFileSystemBackend()
     33     : isolated_file_util_(new AsyncFileUtilAdapter(new LocalFileUtil())),
     34       dragged_file_util_(new AsyncFileUtilAdapter(new DraggedFileUtil())),
     35       transient_file_util_(new AsyncFileUtilAdapter(new TransientFileUtil())) {
     36 }
     37 
     38 IsolatedFileSystemBackend::~IsolatedFileSystemBackend() {
     39 }
     40 
     41 bool IsolatedFileSystemBackend::CanHandleType(FileSystemType type) const {
     42   switch (type) {
     43     case kFileSystemTypeIsolated:
     44     case kFileSystemTypeDragged:
     45     case kFileSystemTypeForTransientFile:
     46       return true;
     47 #if !defined(OS_CHROMEOS)
     48     case kFileSystemTypeNativeLocal:
     49     case kFileSystemTypeNativeForPlatformApp:
     50       return true;
     51 #endif
     52     default:
     53       return false;
     54   }
     55 }
     56 
     57 void IsolatedFileSystemBackend::Initialize(FileSystemContext* context) {
     58 }
     59 
     60 void IsolatedFileSystemBackend::OpenFileSystem(
     61     const GURL& origin_url,
     62     FileSystemType type,
     63     OpenFileSystemMode mode,
     64     const OpenFileSystemCallback& callback) {
     65   // We never allow opening a new isolated FileSystem via usual OpenFileSystem.
     66   base::MessageLoopProxy::current()->PostTask(
     67       FROM_HERE,
     68       base::Bind(callback,
     69                  GetFileSystemRootURI(origin_url, type),
     70                  GetFileSystemName(origin_url, type),
     71                  base::PLATFORM_FILE_ERROR_SECURITY));
     72 }
     73 
     74 AsyncFileUtil* IsolatedFileSystemBackend::GetAsyncFileUtil(
     75     FileSystemType type) {
     76   switch (type) {
     77     case kFileSystemTypeNativeLocal:
     78       return isolated_file_util_.get();
     79     case kFileSystemTypeDragged:
     80       return dragged_file_util_.get();
     81     case kFileSystemTypeForTransientFile:
     82       return transient_file_util_.get();
     83     default:
     84       NOTREACHED();
     85   }
     86   return NULL;
     87 }
     88 
     89 CopyOrMoveFileValidatorFactory*
     90 IsolatedFileSystemBackend::GetCopyOrMoveFileValidatorFactory(
     91     FileSystemType type, base::PlatformFileError* error_code) {
     92   DCHECK(error_code);
     93   *error_code = base::PLATFORM_FILE_OK;
     94   return NULL;
     95 }
     96 
     97 FileSystemOperation* IsolatedFileSystemBackend::CreateFileSystemOperation(
     98     const FileSystemURL& url,
     99     FileSystemContext* context,
    100     base::PlatformFileError* error_code) const {
    101   return FileSystemOperation::Create(
    102       url, context, make_scoped_ptr(new FileSystemOperationContext(context)));
    103 }
    104 
    105 scoped_ptr<webkit_blob::FileStreamReader>
    106 IsolatedFileSystemBackend::CreateFileStreamReader(
    107     const FileSystemURL& url,
    108     int64 offset,
    109     const base::Time& expected_modification_time,
    110     FileSystemContext* context) const {
    111   return scoped_ptr<webkit_blob::FileStreamReader>(
    112       webkit_blob::FileStreamReader::CreateForLocalFile(
    113           context->default_file_task_runner(),
    114           url.path(), offset, expected_modification_time));
    115 }
    116 
    117 scoped_ptr<FileStreamWriter> IsolatedFileSystemBackend::CreateFileStreamWriter(
    118     const FileSystemURL& url,
    119     int64 offset,
    120     FileSystemContext* context) const {
    121   return scoped_ptr<FileStreamWriter>(FileStreamWriter::CreateForLocalFile(
    122       context->default_file_task_runner(), url.path(), offset));
    123 }
    124 
    125 FileSystemQuotaUtil* IsolatedFileSystemBackend::GetQuotaUtil() {
    126   // No quota support.
    127   return NULL;
    128 }
    129 
    130 }  // namespace fileapi
    131