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::OpenFileSystem(
  64     const GURL& origin_url,
  65     fileapi::FileSystemType type,
  66     OpenFileSystemMode mode,
  67     const OpenFileSystemCallback& callback) {
  68   DCHECK(CanHandleType(type));
  69   DCHECK(delegate_);
  70   if (delegate_->file_system_options().is_incognito() &&
  71       !(type == kFileSystemTypeTemporary &&
  72         enable_temporary_file_system_in_incognito_)) {
  73     // TODO(kinuko): return an isolated temporary directory.
  74     callback.Run(GURL(), std::string(), base::PLATFORM_FILE_ERROR_SECURITY);
  75     return;
  76   }
  77
  78   delegate_->OpenFileSystem(
  79       origin_url, type, mode, callback,
  80       GetFileSystemRootURI(origin_url, type));
  81 }
  82
  83 AsyncFileUtil* SandboxFileSystemBackend::GetAsyncFileUtil(
  84     FileSystemType type) {
  85   DCHECK(delegate_);
  86   return delegate_->file_util();
  87 }
  88
  89 CopyOrMoveFileValidatorFactory*
  90 SandboxFileSystemBackend::GetCopyOrMoveFileValidatorFactory(
  91     FileSystemType type,
  92     base::PlatformFileError* error_code) {
  93   DCHECK(error_code);
  94   *error_code = base::PLATFORM_FILE_OK;
  95   return NULL;
  96 }
  97
  98 FileSystemOperation* SandboxFileSystemBackend::CreateFileSystemOperation(
  99     const FileSystemURL& url,
 100     FileSystemContext* context,
 101     base::PlatformFileError* error_code) const {
 102   DCHECK(CanHandleType(url.type()));
 103   DCHECK(error_code);
 104
 105   DCHECK(delegate_);
 106   scoped_ptr<FileSystemOperationContext> operation_context =
 107       delegate_->CreateFileSystemOperationContext(url, context, error_code);
 108   if (!operation_context)
 109     return NULL;
 110
 111   SpecialStoragePolicy* policy = delegate_->special_storage_policy();
 112   if (policy && policy->IsStorageUnlimited(url.origin()))
 113     operation_context->set_quota_limit_type(quota::kQuotaLimitTypeUnlimited);
 114   else
 115     operation_context->set_quota_limit_type(quota::kQuotaLimitTypeLimited);
 116
 117   return FileSystemOperation::Create(url, context, operation_context.Pass());
 118 }
 119
 120 scoped_ptr<webkit_blob::FileStreamReader>
 121 SandboxFileSystemBackend::CreateFileStreamReader(
 122     const FileSystemURL& url,
 123     int64 offset,
 124     const base::Time& expected_modification_time,
 125     FileSystemContext* context) const {
 126   DCHECK(CanHandleType(url.type()));
 127   DCHECK(delegate_);
 128   return delegate_->CreateFileStreamReader(
 129       url, offset, expected_modification_time, context);
 130 }
 131
 132 scoped_ptr<fileapi::FileStreamWriter>
 133 SandboxFileSystemBackend::CreateFileStreamWriter(
 134     const FileSystemURL& url,
 135     int64 offset,
 136     FileSystemContext* context) const {
 137   DCHECK(CanHandleType(url.type()));
 138   DCHECK(delegate_);
 139   return delegate_->CreateFileStreamWriter(url, offset, context, url.type());
 140 }
 141
 142 FileSystemQuotaUtil* SandboxFileSystemBackend::GetQuotaUtil() {
 143   return delegate_;
 144 }
 145
 146 SandboxFileSystemBackendDelegate::OriginEnumerator*
 147 SandboxFileSystemBackend::CreateOriginEnumerator() {
 148   DCHECK(delegate_);
 149   return delegate_->CreateOriginEnumerator();
 150 }
 151
 152 }  // namespace fileapi