chrome/browser/chromeos/fileapi/file_access_permissions.cc

   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