1 // Copyright 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.
5 #include "chrome/browser/chromeos/fileapi/file_system_backend.h"
7 #include "base/logging.h"
8 #include "base/memory/scoped_ptr.h"
9 #include "base/message_loop/message_loop.h"
10 #include "base/strings/stringprintf.h"
11 #include "base/strings/utf_string_conversions.h"
12 #include "base/synchronization/lock.h"
13 #include "chrome/browser/chromeos/fileapi/file_access_permissions.h"
14 #include "chrome/browser/chromeos/fileapi/file_system_backend_delegate.h"
15 #include "chromeos/dbus/cros_disks_client.h"
16 #include "webkit/browser/blob/file_stream_reader.h"
17 #include "webkit/browser/fileapi/async_file_util.h"
18 #include "webkit/browser/fileapi/external_mount_points.h"
19 #include "webkit/browser/fileapi/file_stream_writer.h"
20 #include "webkit/browser/fileapi/file_system_context.h"
21 #include "webkit/browser/fileapi/file_system_operation.h"
22 #include "webkit/browser/fileapi/file_system_operation_context.h"
23 #include "webkit/browser/fileapi/file_system_url.h"
24 #include "webkit/browser/fileapi/isolated_context.h"
28 const char kChromeUIScheme[] = "chrome";
35 bool FileSystemBackend::CanHandleURL(const fileapi::FileSystemURL& url) {
38 return url.type() == fileapi::kFileSystemTypeNativeLocal ||
39 url.type() == fileapi::kFileSystemTypeRestrictedNativeLocal ||
40 url.type() == fileapi::kFileSystemTypeDrive;
43 FileSystemBackend::FileSystemBackend(
44 FileSystemBackendDelegate* drive_delegate,
45 scoped_refptr<quota::SpecialStoragePolicy> special_storage_policy,
46 scoped_refptr<fileapi::ExternalMountPoints> mount_points,
47 fileapi::ExternalMountPoints* system_mount_points)
48 : special_storage_policy_(special_storage_policy),
49 file_access_permissions_(new FileAccessPermissions()),
50 local_file_util_(fileapi::AsyncFileUtil::CreateForLocalFileSystem()),
51 drive_delegate_(drive_delegate),
52 mount_points_(mount_points),
53 system_mount_points_(system_mount_points) {
56 FileSystemBackend::~FileSystemBackend() {
59 void FileSystemBackend::AddSystemMountPoints() {
60 // RegisterFileSystem() is no-op if the mount point with the same name
61 // already exists, hence it's safe to call without checking if a mount
62 // point already exists or not.
63 system_mount_points_->RegisterFileSystem(
65 fileapi::kFileSystemTypeNativeLocal,
66 fileapi::FileSystemMountOption(),
67 chromeos::CrosDisksClient::GetArchiveMountPoint());
68 system_mount_points_->RegisterFileSystem(
70 fileapi::kFileSystemTypeNativeLocal,
71 fileapi::FileSystemMountOption(fileapi::COPY_SYNC_OPTION_SYNC),
72 chromeos::CrosDisksClient::GetRemovableDiskMountPoint());
73 system_mount_points_->RegisterFileSystem(
75 fileapi::kFileSystemTypeRestrictedNativeLocal,
76 fileapi::FileSystemMountOption(),
77 base::FilePath(FILE_PATH_LITERAL("/usr/share/oem")));
80 bool FileSystemBackend::CanHandleType(fileapi::FileSystemType type) const {
82 case fileapi::kFileSystemTypeExternal:
83 case fileapi::kFileSystemTypeDrive:
84 case fileapi::kFileSystemTypeRestrictedNativeLocal:
85 case fileapi::kFileSystemTypeNativeLocal:
86 case fileapi::kFileSystemTypeNativeForPlatformApp:
93 void FileSystemBackend::Initialize(fileapi::FileSystemContext* context) {
96 void FileSystemBackend::OpenFileSystem(
97 const GURL& origin_url,
98 fileapi::FileSystemType type,
99 fileapi::OpenFileSystemMode mode,
100 const OpenFileSystemCallback& callback) {
101 // TODO(nhiroki): Deprecate OpenFileSystem for non-sandboxed filesystem.
102 // (http://crbug.com/297412)
104 callback.Run(GURL(), std::string(), base::File::FILE_ERROR_SECURITY);
107 fileapi::FileSystemQuotaUtil* FileSystemBackend::GetQuotaUtil() {
112 bool FileSystemBackend::IsAccessAllowed(
113 const fileapi::FileSystemURL& url) const {
117 // Permit access to mount points from internal WebUI.
118 const GURL& origin_url = url.origin();
119 if (origin_url.SchemeIs(kChromeUIScheme))
122 // No extra check is needed for isolated file systems.
123 if (url.mount_type() == fileapi::kFileSystemTypeIsolated)
126 if (!CanHandleURL(url))
129 std::string extension_id = origin_url.host();
130 // TODO(mtomasz): Temporarily whitelist TimeScapes. Remove this in M-31.
131 // See: crbug.com/271946
132 if (extension_id == "mlbmkoenclnokonejhlfakkeabdlmpek" &&
133 url.type() == fileapi::kFileSystemTypeRestrictedNativeLocal) {
137 // Check first to make sure this extension has fileBrowserHander permissions.
138 if (!special_storage_policy_->IsFileHandler(extension_id))
141 return file_access_permissions_->HasAccessPermission(extension_id,
145 void FileSystemBackend::GrantFullAccessToExtension(
146 const std::string& extension_id) {
147 DCHECK(special_storage_policy_->IsFileHandler(extension_id));
148 if (!special_storage_policy_->IsFileHandler(extension_id))
150 file_access_permissions_->GrantFullAccessPermission(extension_id);
153 void FileSystemBackend::GrantFileAccessToExtension(
154 const std::string& extension_id, const base::FilePath& virtual_path) {
155 // All we care about here is access from extensions for now.
156 DCHECK(special_storage_policy_->IsFileHandler(extension_id));
157 if (!special_storage_policy_->IsFileHandler(extension_id))
161 fileapi::FileSystemType type;
163 fileapi::FileSystemMountOption option;
164 if (!mount_points_->CrackVirtualPath(virtual_path,
165 &id, &type, &path, &option) &&
166 !system_mount_points_->CrackVirtualPath(virtual_path,
167 &id, &type, &path, &option)) {
171 if (type == fileapi::kFileSystemTypeRestrictedNativeLocal) {
172 LOG(ERROR) << "Can't grant access for restricted mount point";
176 file_access_permissions_->GrantAccessPermission(extension_id, virtual_path);
179 void FileSystemBackend::RevokeAccessForExtension(
180 const std::string& extension_id) {
181 file_access_permissions_->RevokePermissions(extension_id);
184 std::vector<base::FilePath> FileSystemBackend::GetRootDirectories() const {
185 std::vector<fileapi::MountPoints::MountPointInfo> mount_points;
186 mount_points_->AddMountPointInfosTo(&mount_points);
187 system_mount_points_->AddMountPointInfosTo(&mount_points);
189 std::vector<base::FilePath> root_dirs;
190 for (size_t i = 0; i < mount_points.size(); ++i)
191 root_dirs.push_back(mount_points[i].path);
195 fileapi::AsyncFileUtil* FileSystemBackend::GetAsyncFileUtil(
196 fileapi::FileSystemType type) {
197 if (type == fileapi::kFileSystemTypeDrive)
198 return drive_delegate_->GetAsyncFileUtil(type);
200 DCHECK(type == fileapi::kFileSystemTypeNativeLocal ||
201 type == fileapi::kFileSystemTypeRestrictedNativeLocal);
202 return local_file_util_.get();
205 fileapi::CopyOrMoveFileValidatorFactory*
206 FileSystemBackend::GetCopyOrMoveFileValidatorFactory(
207 fileapi::FileSystemType type, base::File::Error* error_code) {
209 *error_code = base::File::FILE_OK;
213 fileapi::FileSystemOperation* FileSystemBackend::CreateFileSystemOperation(
214 const fileapi::FileSystemURL& url,
215 fileapi::FileSystemContext* context,
216 base::File::Error* error_code) const {
217 DCHECK(url.is_valid());
219 if (!IsAccessAllowed(url)) {
220 *error_code = base::File::FILE_ERROR_SECURITY;
224 DCHECK(url.type() == fileapi::kFileSystemTypeNativeLocal ||
225 url.type() == fileapi::kFileSystemTypeRestrictedNativeLocal ||
226 url.type() == fileapi::kFileSystemTypeDrive);
227 return fileapi::FileSystemOperation::Create(
229 make_scoped_ptr(new fileapi::FileSystemOperationContext(context)));
232 scoped_ptr<webkit_blob::FileStreamReader>
233 FileSystemBackend::CreateFileStreamReader(
234 const fileapi::FileSystemURL& url,
236 const base::Time& expected_modification_time,
237 fileapi::FileSystemContext* context) const {
238 DCHECK(url.is_valid());
240 if (!IsAccessAllowed(url))
241 return scoped_ptr<webkit_blob::FileStreamReader>();
243 if (url.type() == fileapi::kFileSystemTypeDrive) {
244 return drive_delegate_->CreateFileStreamReader(
245 url, offset, expected_modification_time, context);
248 return scoped_ptr<webkit_blob::FileStreamReader>(
249 webkit_blob::FileStreamReader::CreateForFileSystemFile(
250 context, url, offset, expected_modification_time));
253 scoped_ptr<fileapi::FileStreamWriter>
254 FileSystemBackend::CreateFileStreamWriter(
255 const fileapi::FileSystemURL& url,
257 fileapi::FileSystemContext* context) const {
258 DCHECK(url.is_valid());
260 if (!IsAccessAllowed(url))
261 return scoped_ptr<fileapi::FileStreamWriter>();
263 if (url.type() == fileapi::kFileSystemTypeDrive)
264 return drive_delegate_->CreateFileStreamWriter(url, offset, context);
266 if (url.type() == fileapi::kFileSystemTypeRestrictedNativeLocal)
267 return scoped_ptr<fileapi::FileStreamWriter>();
269 DCHECK(url.type() == fileapi::kFileSystemTypeNativeLocal);
270 return scoped_ptr<fileapi::FileStreamWriter>(
271 fileapi::FileStreamWriter::CreateForLocalFile(
272 context->default_file_task_runner(), url.path(), offset));
275 bool FileSystemBackend::GetVirtualPath(
276 const base::FilePath& filesystem_path,
277 base::FilePath* virtual_path) {
278 return mount_points_->GetVirtualPath(filesystem_path, virtual_path) ||
279 system_mount_points_->GetVirtualPath(filesystem_path, virtual_path);
282 } // namespace chromeos