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. 4 5 #include "chrome/browser/chromeos/fileapi/file_access_permissions.h" 6 7 #include "base/logging.h" 8 9 namespace chromeos { 10 11 namespace { 12 13 // Empty path is prefix of any other paths, hence it represents full permission. 14 base::FilePath FullPermission() { return base::FilePath(); } 15 16 } // namespace 17 18 FileAccessPermissions::FileAccessPermissions() {} 19 20 FileAccessPermissions::~FileAccessPermissions() {} 21 22 void FileAccessPermissions::GrantFullAccessPermission( 23 const std::string& extension_id) { 24 base::AutoLock locker(lock_); 25 path_map_[extension_id].insert(FullPermission()); 26 } 27 28 void FileAccessPermissions::GrantAccessPermission( 29 const std::string& extension_id, const base::FilePath& path) { 30 DCHECK(!path.empty()); 31 base::AutoLock locker(lock_); 32 path_map_[extension_id].insert(path); 33 } 34 35 bool FileAccessPermissions::HasAccessPermission( 36 const std::string& extension_id, const base::FilePath& path) const { 37 base::AutoLock locker(lock_); 38 PathAccessMap::const_iterator path_map_iter = path_map_.find(extension_id); 39 if (path_map_iter == path_map_.end()) 40 return false; 41 const PathSet& path_set = path_map_iter->second; 42 43 if (path_set.find(FullPermission()) != path_set.end()) 44 return true; 45 46 // Check this file and walk up its directory tree to find if this extension 47 // has access to it. 48 base::FilePath current_path = path.StripTrailingSeparators(); 49 base::FilePath last_path; 50 while (current_path != last_path) { 51 if (path_set.find(current_path) != path_set.end()) 52 return true; 53 last_path = current_path; 54 current_path = current_path.DirName(); 55 } 56 return false; 57 } 58 59 void FileAccessPermissions::RevokePermissions( 60 const std::string& extension_id) { 61 base::AutoLock locker(lock_); 62 path_map_.erase(extension_id); 63 } 64 65 } // namespace chromeos 66
