webkit/browser/fileapi/sandbox_file_system_backend.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 "webkit/browser/fileapi/sandbox_file_system_backend.h"
   6
   7 #include "base/bind.h"
   8 #include "base/file_util.h"
   9 #include "base/logging.h"
  10 #include "base/metrics/histogram.h"
  11 #include "base/task_runner_util.h"
  12 #include "url/gurl.h"
  13 #include "webkit/browser/blob/file_stream_reader.h"
  14 #include "webkit/browser/fileapi/async_file_util_adapter.h"
  15 #include "webkit/browser/fileapi/copy_or_move_file_validator.h"
  16 #include "webkit/browser/fileapi/file_stream_writer.h"
  17 #include "webkit/browser/fileapi/file_system_context.h"
  18 #include "webkit/browser/fileapi/file_system_operation.h"
  19 #include "webkit/browser/fileapi/file_system_operation_context.h"
  20 #include "webkit/browser/fileapi/file_system_options.h"
  21 #include "webkit/browser/fileapi/file_system_usage_cache.h"
  22 #include "webkit/browser/fileapi/obfuscated_file_util.h"
  23 #include "webkit/browser/fileapi/sandbox_file_system_backend_delegate.h"
  24 #include "webkit/browser/fileapi/sandbox_quota_observer.h"
  25 #include "webkit/browser/quota/quota_manager.h"
  26 #include "webkit/common/fileapi/file_system_types.h"
  27 #include "webkit/common/fileapi/file_system_util.h"
  28
  29 using quota::QuotaManagerProxy;
  30 using quota::SpecialStoragePolicy;
  31
  32 namespace fileapi {
  33
  34 SandboxFileSystemBackend::SandboxFileSystemBackend(
  35     SandboxFileSystemBackendDelegate* delegate)
  36     : delegate_(delegate),
  37       enable_temporary_file_system_in_incognito_(false) {
  38 }
  39
  40 SandboxFileSystemBackend::~SandboxFileSystemBackend() {
  41 }
  42
  43 bool SandboxFileSystemBackend::CanHandleType(FileSystemType type) const {
  44   return type == kFileSystemTypeTemporary ||
  45          type == kFileSystemTypePersistent;
  46 }
  47
  48 void SandboxFileSystemBackend::Initialize(FileSystemContext* context) {
  49   DCHECK(delegate_);
  50
  51   // Set quota observers.
  52   delegate_->RegisterQuotaUpdateObserver(fileapi::kFileSystemTypeTemporary);
  53   delegate_->AddFileAccessObserver(
  54       fileapi::kFileSystemTypeTemporary,
  55       delegate_->quota_observer(), NULL);
  56
  57   delegate_->RegisterQuotaUpdateObserver(fileapi::kFileSystemTypePersistent);
  58   delegate_->AddFileAccessObserver(
  59       fileapi::kFileSystemTypePersistent,
  60       delegate_->quota_observer(), NULL);
  61 }
  62
  63 void SandboxFileSystemBackend::ResolveURL(
  64     const FileSystemURL& url,
  65     OpenFileSystemMode mode,
  66     const OpenFileSystemCallback& callback) {
  67   DCHECK(CanHandleType(url.type()));
  68   DCHECK(delegate_);
  69   if (delegate_->file_system_options().is_incognito() &&
  70       !(url.type() == kFileSystemTypeTemporary &&
  71         enable_temporary_file_system_in_incognito_)) {
  72     // TODO(kinuko): return an isolated temporary directory.
  73     callback.Run(GURL(), std::string(), base::File::FILE_ERROR_SECURITY);
  74     return;
  75   }
  76
  77   delegate_->OpenFileSystem(url.origin(),
  78                             url.type(),
  79                             mode,
  80                             callback,
  81                             GetFileSystemRootURI(url.origin(), url.type()));
  82 }
  83
  84 AsyncFileUtil* SandboxFileSystemBackend::GetAsyncFileUtil(
  85     FileSystemType type) {
  86   DCHECK(delegate_);
  87   return delegate_->file_util();
  88 }
  89
  90 CopyOrMoveFileValidatorFactory*
  91 SandboxFileSystemBackend::GetCopyOrMoveFileValidatorFactory(
  92     FileSystemType type,
  93     base::File::Error* error_code) {
  94   DCHECK(error_code);
  95   *error_code = base::File::FILE_OK;
  96   return NULL;
  97 }
  98
  99 FileSystemOperation* SandboxFileSystemBackend::CreateFileSystemOperation(
 100     const FileSystemURL& url,
 101     FileSystemContext* context,
 102     base::File::Error* error_code) const {
 103   DCHECK(CanHandleType(url.type()));
 104   DCHECK(error_code);
 105
 106   DCHECK(delegate_);
 107   scoped_ptr<FileSystemOperationContext> operation_context =
 108       delegate_->CreateFileSystemOperationContext(url, context, error_code);
 109   if (!operation_context)
 110     return NULL;
 111
 112   SpecialStoragePolicy* policy = delegate_->special_storage_policy();
 113   if (policy && policy->IsStorageUnlimited(url.origin()))
 114     operation_context->set_quota_limit_type(quota::kQuotaLimitTypeUnlimited);
 115   else
 116     operation_context->set_quota_limit_type(quota::kQuotaLimitTypeLimited);
 117
 118   return FileSystemOperation::Create(url, context, operation_context.Pass());
 119 }
 120
 121 bool SandboxFileSystemBackend::SupportsStreaming(
 122     const fileapi::FileSystemURL& url) const {
 123   return false;
 124 }
 125
 126 scoped_ptr<webkit_blob::FileStreamReader>
 127 SandboxFileSystemBackend::CreateFileStreamReader(
 128     const FileSystemURL& url,
 129     int64 offset,
 130     const base::Time& expected_modification_time,
 131     FileSystemContext* context) const {
 132   DCHECK(CanHandleType(url.type()));
 133   DCHECK(delegate_);
 134   return delegate_->CreateFileStreamReader(
 135       url, offset, expected_modification_time, context);
 136 }
 137
 138 scoped_ptr<fileapi::FileStreamWriter>
 139 SandboxFileSystemBackend::CreateFileStreamWriter(
 140     const FileSystemURL& url,
 141     int64 offset,
 142     FileSystemContext* context) const {
 143   DCHECK(CanHandleType(url.type()));
 144   DCHECK(delegate_);
 145   return delegate_->CreateFileStreamWriter(url, offset, context, url.type());
 146 }
 147
 148 FileSystemQuotaUtil* SandboxFileSystemBackend::GetQuotaUtil() {
 149   return delegate_;
 150 }
 151
 152 SandboxFileSystemBackendDelegate::OriginEnumerator*
 153 SandboxFileSystemBackend::CreateOriginEnumerator() {
 154   DCHECK(delegate_);
 155   return delegate_->CreateOriginEnumerator();
 156 }
 157
 158 }  // namespace fileapi