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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.
FullPermission()14 base::FilePath FullPermission() { return base::FilePath(); }
15 
16 }  // namespace
17 
FileAccessPermissions()18 FileAccessPermissions::FileAccessPermissions() {}
19 
~FileAccessPermissions()20 FileAccessPermissions::~FileAccessPermissions() {}
21 
GrantFullAccessPermission(const std::string & extension_id)22 void FileAccessPermissions::GrantFullAccessPermission(
23     const std::string& extension_id) {
24   base::AutoLock locker(lock_);
25   path_map_[extension_id].insert(FullPermission());
26 }
27 
GrantAccessPermission(const std::string & extension_id,const base::FilePath & path)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 
HasAccessPermission(const std::string & extension_id,const base::FilePath & path) const35 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 
RevokePermissions(const std::string & extension_id)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