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.
5 #ifndef WEBKIT_BROWSER_FILEAPI_OBFUSCATED_FILE_UTIL_H_
6 #define WEBKIT_BROWSER_FILEAPI_OBFUSCATED_FILE_UTIL_H_
13 #include "base/callback_forward.h"
14 #include "base/files/file.h"
15 #include "base/files/file_path.h"
16 #include "base/files/file_util_proxy.h"
17 #include "base/gtest_prod_util.h"
18 #include "base/memory/scoped_ptr.h"
19 #include "base/platform_file.h"
20 #include "webkit/browser/fileapi/file_system_file_util.h"
21 #include "webkit/browser/fileapi/file_system_url.h"
22 #include "webkit/browser/fileapi/sandbox_directory_database.h"
23 #include "webkit/browser/fileapi/sandbox_file_system_backend_delegate.h"
24 #include "webkit/browser/webkit_storage_browser_export.h"
25 #include "webkit/common/blob/shareable_file_reference.h"
26 #include "webkit/common/fileapi/file_system_types.h"
29 class SequencedTaskRunner;
34 class ObfuscatedFileUtilTest;
38 class SpecialStoragePolicy;
45 class FileSystemOperationContext;
46 class SandboxOriginDatabaseInterface;
47 class TimedTaskHelper;
49 // This file util stores directory information in LevelDB to obfuscate
50 // and to neutralize virtual file paths given by arbitrary apps.
51 // Files are stored with two-level isolation: per-origin and per-type.
52 // The isolation is done by storing data in separate directory partitions.
53 // For example, a file in Temporary file system for origin 'www.example.com'
54 // is stored in a different partition for a file in Persistent file system
55 // for the same origin, or for Temporary file system for another origin.
57 // * Per-origin directory name information is stored in a separate LevelDB,
58 // which is maintained by SandboxOriginDatabase.
59 // * Per-type directory name information is given by
60 // GetTypeStringForURLCallback that is given in CTOR.
61 // We use a small static mapping (e.g. 't' for Temporary type) for
62 // regular sandbox filesystems.
64 // The overall implementation philosophy of this class is that partial failures
65 // should leave us with an intact database; we'd prefer to leak the occasional
66 // backing file than have a database entry whose backing file is missing. When
67 // doing FSCK operations, if you find a loose backing file with no reference,
68 // you may safely delete it.
70 // This class must be deleted on the FILE thread, because that's where
71 // DropDatabases needs to be called.
72 class WEBKIT_STORAGE_BROWSER_EXPORT_PRIVATE ObfuscatedFileUtil
73 : public FileSystemFileUtil {
75 // Origin enumerator interface.
76 // An instance of this interface is assumed to be called on the file thread.
77 class AbstractOriginEnumerator {
79 virtual ~AbstractOriginEnumerator() {}
81 // Returns the next origin. Returns empty if there are no more origins.
82 virtual GURL Next() = 0;
84 // Returns the current origin's information.
85 // |type_string| must be ascii string.
86 virtual bool HasTypeDirectory(const std::string& type_string) const = 0;
89 typedef base::Callback<std::string(const FileSystemURL&)>
90 GetTypeStringForURLCallback;
92 // |get_type_string_for_url| is user-defined callback that should return
93 // a type string for the given FileSystemURL. The type string is used
94 // to provide per-type isolation in the sandboxed filesystem directory.
95 // Note that this method is called on file_task_runner.
97 // |known_type_strings| are known type string names that this file system
99 // This info is used to determine whether we could delete the entire
100 // origin directory or not in DeleteDirectoryForOriginAndType. If no directory
101 // for any known type exists the origin directory may get deleted when
102 // one origin/type pair is deleted.
105 quota::SpecialStoragePolicy* special_storage_policy,
106 const base::FilePath& file_system_directory,
107 leveldb::Env* env_override,
108 base::SequencedTaskRunner* file_task_runner,
109 const GetTypeStringForURLCallback& get_type_string_for_url,
110 const std::set<std::string>& known_type_strings,
111 SandboxFileSystemBackendDelegate* sandbox_delegate);
112 virtual ~ObfuscatedFileUtil();
114 // FileSystemFileUtil overrides.
115 virtual base::File::Error CreateOrOpen(
116 FileSystemOperationContext* context,
117 const FileSystemURL& url,
119 base::PlatformFile* file_handle,
120 bool* created) OVERRIDE;
121 virtual base::File::Error Close(
122 FileSystemOperationContext* context,
123 base::PlatformFile file) OVERRIDE;
124 virtual base::File::Error EnsureFileExists(
125 FileSystemOperationContext* context,
126 const FileSystemURL& url, bool* created) OVERRIDE;
127 virtual base::File::Error CreateDirectory(
128 FileSystemOperationContext* context,
129 const FileSystemURL& url,
131 bool recursive) OVERRIDE;
132 virtual base::File::Error GetFileInfo(
133 FileSystemOperationContext* context,
134 const FileSystemURL& url,
135 base::File::Info* file_info,
136 base::FilePath* platform_file) OVERRIDE;
137 virtual scoped_ptr<AbstractFileEnumerator> CreateFileEnumerator(
138 FileSystemOperationContext* context,
139 const FileSystemURL& root_url) OVERRIDE;
140 virtual base::File::Error GetLocalFilePath(
141 FileSystemOperationContext* context,
142 const FileSystemURL& file_system_url,
143 base::FilePath* local_path) OVERRIDE;
144 virtual base::File::Error Touch(
145 FileSystemOperationContext* context,
146 const FileSystemURL& url,
147 const base::Time& last_access_time,
148 const base::Time& last_modified_time) OVERRIDE;
149 virtual base::File::Error Truncate(
150 FileSystemOperationContext* context,
151 const FileSystemURL& url,
152 int64 length) OVERRIDE;
153 virtual base::File::Error CopyOrMoveFile(
154 FileSystemOperationContext* context,
155 const FileSystemURL& src_url,
156 const FileSystemURL& dest_url,
157 CopyOrMoveOption option,
159 virtual base::File::Error CopyInForeignFile(
160 FileSystemOperationContext* context,
161 const base::FilePath& src_file_path,
162 const FileSystemURL& dest_url) OVERRIDE;
163 virtual base::File::Error DeleteFile(
164 FileSystemOperationContext* context,
165 const FileSystemURL& url) OVERRIDE;
166 virtual base::File::Error DeleteDirectory(
167 FileSystemOperationContext* context,
168 const FileSystemURL& url) OVERRIDE;
169 virtual webkit_blob::ScopedFile CreateSnapshotFile(
170 FileSystemOperationContext* context,
171 const FileSystemURL& url,
172 base::File::Error* error,
173 base::File::Info* file_info,
174 base::FilePath* platform_path) OVERRIDE;
176 // Same as the other CreateFileEnumerator, but with recursive support.
177 scoped_ptr<AbstractFileEnumerator> CreateFileEnumerator(
178 FileSystemOperationContext* context,
179 const FileSystemURL& root_url,
182 // Returns true if the directory |url| is empty.
183 bool IsDirectoryEmpty(
184 FileSystemOperationContext* context,
185 const FileSystemURL& url);
187 // Gets the topmost directory specific to this origin and type. This will
188 // contain both the directory database's files and all the backing file
190 // Returns the topmost origin directory if |type_string| is empty.
191 // Returns an empty path if the directory is undefined.
192 // If the directory is defined, it will be returned, even if
193 // there is a file system error (e.g. the directory doesn't exist on disk and
194 // |create| is false). Callers should always check |error_code| to make sure
195 // the returned path is usable.
196 base::FilePath GetDirectoryForOriginAndType(
198 const std::string& type_string,
200 base::File::Error* error_code);
202 // Deletes the topmost directory specific to this origin and type. This will
203 // delete its directory database.
204 // Deletes the topmost origin directory if |type_string| is empty.
205 bool DeleteDirectoryForOriginAndType(
207 const std::string& type_string);
209 // This method and all methods of its returned class must be called only on
210 // the FILE thread. The caller is responsible for deleting the returned
212 AbstractOriginEnumerator* CreateOriginEnumerator();
214 // Deletes a directory database from the database list in the ObfuscatedFSFU
215 // and destroys the database on the disk.
216 bool DestroyDirectoryDatabase(const GURL& origin,
217 const std::string& type_string);
219 // Computes a cost for storing a given file in the obfuscated FSFU.
220 // As the cost of a file is independent of the cost of its parent directories,
221 // this ignores all but the BaseName of the supplied path. In order to
222 // compute the cost of adding a multi-segment directory recursively, call this
223 // on each path segment and add the results.
224 static int64 ComputeFilePathCost(const base::FilePath& path);
226 // Tries to prepopulate directory database for the given type strings.
227 // This tries from the first one in the given type_strings and stops
228 // once it succeeds to do so for one database (i.e. it prepopulates
229 // at most one database).
230 void MaybePrepopulateDatabase(
231 const std::vector<std::string>& type_strings_to_prepopulate);
234 typedef SandboxDirectoryDatabase::FileId FileId;
235 typedef SandboxDirectoryDatabase::FileInfo FileInfo;
237 friend class ObfuscatedFileEnumerator;
238 friend class QuotaBackendImplTest;
239 friend class content::ObfuscatedFileUtilTest;
241 // Helper method to create an obfuscated file util for regular
242 // (temporary, persistent) file systems. Used only for testing.
243 // Note: this is implemented in sandbox_file_system_backend_delegate.cc.
244 static ObfuscatedFileUtil* CreateForTesting(
245 quota::SpecialStoragePolicy* special_storage_policy,
246 const base::FilePath& file_system_directory,
247 leveldb::Env* env_override,
248 base::SequencedTaskRunner* file_task_runner);
250 base::FilePath GetDirectoryForURL(
251 const FileSystemURL& url,
253 base::File::Error* error_code);
255 // This just calls get_type_string_for_url_ callback that is given in ctor.
256 std::string CallGetTypeStringForURL(const FileSystemURL& url);
258 base::File::Error GetFileInfoInternal(
259 SandboxDirectoryDatabase* db,
260 FileSystemOperationContext* context,
261 const FileSystemURL& url,
263 FileInfo* local_info,
264 base::File::Info* file_info,
265 base::FilePath* platform_file_path);
267 // Creates a new file, both the underlying backing file and the entry in the
268 // database. |dest_file_info| is an in-out parameter. Supply the name and
269 // parent_id; data_path is ignored. On success, data_path will
270 // always be set to the relative path [from the root of the type-specific
271 // filesystem directory] of a NEW backing file, and handle, if supplied, will
272 // hold open PlatformFile for the backing file, which the caller is
273 // responsible for closing. If you supply a path in |source_path|, it will be
274 // used as a source from which to COPY data.
275 // Caveat: do not supply handle if you're also supplying a data path. It was
276 // easier not to support this, and no code has needed it so far, so it will
277 // DCHECK and handle will hold base::kInvalidPlatformFileValue.
278 base::File::Error CreateFile(
279 FileSystemOperationContext* context,
280 const base::FilePath& source_file_path,
281 const FileSystemURL& dest_url,
282 FileInfo* dest_file_info,
284 base::PlatformFile* handle);
286 // This converts from a relative path [as is stored in the FileInfo.data_path
287 // field] to an absolute platform path that can be given to the native
289 base::FilePath DataPathToLocalPath(
290 const FileSystemURL& url,
291 const base::FilePath& data_file_path);
293 std::string GetDirectoryDatabaseKey(const GURL& origin,
294 const std::string& type_string);
296 // This returns NULL if |create| flag is false and a filesystem does not
297 // exist for the given |url|.
298 // For read operations |create| should be false.
299 SandboxDirectoryDatabase* GetDirectoryDatabase(const FileSystemURL& url,
302 // Gets the topmost directory specific to this origin. This will
303 // contain both the filesystem type subdirectories.
304 base::FilePath GetDirectoryForOrigin(const GURL& origin,
306 base::File::Error* error_code);
308 void InvalidateUsageCache(FileSystemOperationContext* context,
310 FileSystemType type);
313 void DropDatabases();
315 // Initializes the origin database. |origin_hint| may be used as a hint
316 // for initializing database if it's not empty.
317 bool InitOriginDatabase(const GURL& origin_hint, bool create);
319 base::File::Error GenerateNewLocalPath(
320 SandboxDirectoryDatabase* db,
321 FileSystemOperationContext* context,
322 const FileSystemURL& url,
323 base::FilePath* local_path);
325 base::File::Error CreateOrOpenInternal(
326 FileSystemOperationContext* context,
327 const FileSystemURL& url,
329 base::PlatformFile* file_handle,
332 bool HasIsolatedStorage(const GURL& origin);
334 typedef std::map<std::string, SandboxDirectoryDatabase*> DirectoryMap;
335 DirectoryMap directories_;
336 scoped_ptr<SandboxOriginDatabaseInterface> origin_database_;
337 scoped_refptr<quota::SpecialStoragePolicy> special_storage_policy_;
338 base::FilePath file_system_directory_;
339 leveldb::Env* env_override_;
341 // Used to delete database after a certain period of inactivity.
342 int64 db_flush_delay_seconds_;
344 scoped_refptr<base::SequencedTaskRunner> file_task_runner_;
345 scoped_ptr<TimedTaskHelper> timer_;
347 GetTypeStringForURLCallback get_type_string_for_url_;
348 std::set<std::string> known_type_strings_;
351 SandboxFileSystemBackendDelegate* sandbox_delegate_;
353 DISALLOW_COPY_AND_ASSIGN(ObfuscatedFileUtil);
356 } // namespace fileapi
358 #endif // WEBKIT_BROWSER_FILEAPI_OBFUSCATED_FILE_UTIL_H_