storage/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 "storage/browser/fileapi/sandbox_file_system_backend.h"
   6
   7 #include "base/bind.h"
   8 #include "base/files/file_util.h"
   9 #include "base/logging.h"
  10 #include "base/metrics/histogram.h"
  11 #include "base/task_runner_util.h"
  12 #include "storage/browser/fileapi/async_file_util_adapter.h"
  13 #include "storage/browser/fileapi/copy_or_move_file_validator.h"
  14 #include "storage/browser/fileapi/file_stream_reader.h"
  15 #include "storage/browser/fileapi/file_stream_writer.h"
  16 #include "storage/browser/fileapi/file_system_context.h"
  17 #include "storage/browser/fileapi/file_system_operation.h"
  18 #include "storage/browser/fileapi/file_system_operation_context.h"
  19 #include "storage/browser/fileapi/file_system_options.h"
  20 #include "storage/browser/fileapi/file_system_usage_cache.h"
  21 #include "storage/browser/fileapi/obfuscated_file_util.h"
  22 #include "storage/browser/fileapi/sandbox_file_system_backend_delegate.h"
  23 #include "storage/browser/fileapi/sandbox_quota_observer.h"
  24 #include "storage/browser/quota/quota_manager.h"
  25 #include "storage/common/fileapi/file_system_types.h"
  26 #include "storage/common/fileapi/file_system_util.h"
  27 #include "url/gurl.h"
  28
  29 using storage::QuotaManagerProxy;
  30 using storage::SpecialStoragePolicy;
  31
  32 namespace storage {
  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(storage::kFileSystemTypeTemporary);
  53   delegate_->AddFileAccessObserver(
  54       storage::kFileSystemTypeTemporary, delegate_->quota_observer(), NULL);
  55
  56   delegate_->RegisterQuotaUpdateObserver(storage::kFileSystemTypePersistent);
  57   delegate_->AddFileAccessObserver(
  58       storage::kFileSystemTypePersistent, delegate_->quota_observer(), NULL);
  59 }
  60
  61 void SandboxFileSystemBackend::ResolveURL(
  62     const FileSystemURL& url,
  63     OpenFileSystemMode mode,
  64     const OpenFileSystemCallback& callback) {
  65   DCHECK(CanHandleType(url.type()));
  66   DCHECK(delegate_);
  67   if (delegate_->file_system_options().is_incognito() &&
  68       !(url.type() == kFileSystemTypeTemporary &&
  69         enable_temporary_file_system_in_incognito_)) {
  70     // TODO(kinuko): return an isolated temporary directory.
  71     callback.Run(GURL(), std::string(), base::File::FILE_ERROR_SECURITY);
  72     return;
  73   }
  74
  75   delegate_->OpenFileSystem(url.origin(),
  76                             url.type(),
  77                             mode,
  78                             callback,
  79                             GetFileSystemRootURI(url.origin(), url.type()));
  80 }
  81
  82 AsyncFileUtil* SandboxFileSystemBackend::GetAsyncFileUtil(
  83     FileSystemType type) {
  84   DCHECK(delegate_);
  85   return delegate_->file_util();
  86 }
  87
  88 WatcherManager* SandboxFileSystemBackend::GetWatcherManager(
  89     FileSystemType type) {
  90   return NULL;
  91 }
  92
  93 CopyOrMoveFileValidatorFactory*
  94 SandboxFileSystemBackend::GetCopyOrMoveFileValidatorFactory(
  95     FileSystemType type,
  96     base::File::Error* error_code) {
  97   DCHECK(error_code);
  98   *error_code = base::File::FILE_OK;
  99   return NULL;
 100 }
 101
 102 FileSystemOperation* SandboxFileSystemBackend::CreateFileSystemOperation(
 103     const FileSystemURL& url,
 104     FileSystemContext* context,
 105     base::File::Error* error_code) const {
 106   DCHECK(CanHandleType(url.type()));
 107   DCHECK(error_code);
 108
 109   DCHECK(delegate_);
 110   scoped_ptr<FileSystemOperationContext> operation_context =
 111       delegate_->CreateFileSystemOperationContext(url, context, error_code);
 112   if (!operation_context)
 113     return NULL;
 114
 115   SpecialStoragePolicy* policy = delegate_->special_storage_policy();
 116   if (policy && policy->IsStorageUnlimited(url.origin()))
 117     operation_context->set_quota_limit_type(storage::kQuotaLimitTypeUnlimited);
 118   else
 119     operation_context->set_quota_limit_type(storage::kQuotaLimitTypeLimited);
 120
 121   return FileSystemOperation::Create(url, context, operation_context.Pass());
 122 }
 123
 124 bool SandboxFileSystemBackend::SupportsStreaming(
 125     const storage::FileSystemURL& url) const {
 126   return false;
 127 }
 128
 129 bool SandboxFileSystemBackend::HasInplaceCopyImplementation(
 130     storage::FileSystemType type) const {
 131   return false;
 132 }
 133
 134 scoped_ptr<storage::FileStreamReader>
 135 SandboxFileSystemBackend::CreateFileStreamReader(
 136     const FileSystemURL& url,
 137     int64 offset,
 138     int64 max_bytes_to_read,
 139     const base::Time& expected_modification_time,
 140     FileSystemContext* context) const {
 141   DCHECK(CanHandleType(url.type()));
 142   DCHECK(delegate_);
 143   return delegate_->CreateFileStreamReader(
 144       url, offset, expected_modification_time, context);
 145 }
 146
 147 scoped_ptr<storage::FileStreamWriter>
 148 SandboxFileSystemBackend::CreateFileStreamWriter(
 149     const FileSystemURL& url,
 150     int64 offset,
 151     FileSystemContext* context) const {
 152   DCHECK(CanHandleType(url.type()));
 153   DCHECK(delegate_);
 154   return delegate_->CreateFileStreamWriter(url, offset, context, url.type());
 155 }
 156
 157 FileSystemQuotaUtil* SandboxFileSystemBackend::GetQuotaUtil() {
 158   return delegate_;
 159 }
 160
 161 const UpdateObserverList* SandboxFileSystemBackend::GetUpdateObservers(
 162     FileSystemType type) const {
 163   return delegate_->GetUpdateObservers(type);
 164 }
 165
 166 const ChangeObserverList* SandboxFileSystemBackend::GetChangeObservers(
 167     FileSystemType type) const {
 168   return delegate_->GetChangeObservers(type);
 169 }
 170
 171 const AccessObserverList* SandboxFileSystemBackend::GetAccessObservers(
 172     FileSystemType type) const {
 173   return delegate_->GetAccessObservers(type);
 174 }
 175
 176 SandboxFileSystemBackendDelegate::OriginEnumerator*
 177 SandboxFileSystemBackend::CreateOriginEnumerator() {
 178   DCHECK(delegate_);
 179   return delegate_->CreateOriginEnumerator();
 180 }
 181
 182 }  // namespace storage