components/policy/core/common/config_dir_policy_loader.h

   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.
   4
   5 #ifndef COMPONENTS_POLICY_CORE_COMMON_CONFIG_DIR_POLICY_LOADER_H_
   6 #define COMPONENTS_POLICY_CORE_COMMON_CONFIG_DIR_POLICY_LOADER_H_
   7
   8 #include "base/files/file_path.h"
   9 #include "base/files/file_path_watcher.h"
  10 #include "components/policy/core/common/async_policy_loader.h"
  11 #include "components/policy/core/common/policy_types.h"
  12 #include "components/policy/policy_export.h"
  13
  14 namespace base {
  15 class Value;
  16 }
  17
  18 namespace policy {
  19
  20 // A policy loader implementation backed by a set of files in a given
  21 // directory. The files should contain JSON-formatted policy settings. They are
  22 // merged together and the result is returned in a PolicyBundle.
  23 // The files are consulted in lexicographic file name order, so the
  24 // last value read takes precedence in case of policy key collisions.
  25 class POLICY_EXPORT ConfigDirPolicyLoader : public AsyncPolicyLoader {
  26  public:
  27   ConfigDirPolicyLoader(scoped_refptr<base::SequencedTaskRunner> task_runner,
  28                         const base::FilePath& config_dir,
  29                         PolicyScope scope);
  30   virtual ~ConfigDirPolicyLoader();
  31
  32   // AsyncPolicyLoader implementation.
  33   virtual void InitOnBackgroundThread() OVERRIDE;
  34   virtual scoped_ptr<PolicyBundle> Load() OVERRIDE;
  35   virtual base::Time LastModificationTime() OVERRIDE;
  36
  37  private:
  38   // Loads the policy files at |path| into the |bundle|, with the given |level|.
  39   void LoadFromPath(const base::FilePath& path,
  40                     PolicyLevel level,
  41                     PolicyBundle* bundle);
  42
  43   // Merges the 3rd party |policies| into the |bundle|, with the given |level|.
  44   void Merge3rdPartyPolicy(const base::Value* policies,
  45                            PolicyLevel level,
  46                            PolicyBundle* bundle);
  47
  48   // Callback for the FilePathWatchers.
  49   void OnFileUpdated(const base::FilePath& path, bool error);
  50
  51   // The directory containing the policy files.
  52   base::FilePath config_dir_;
  53
  54   // Policies loaded by this provider will have this scope.
  55   PolicyScope scope_;
  56
  57   // Watchers for events on the mandatory and recommended subdirectories of
  58   // |config_dir_|.
  59   base::FilePathWatcher mandatory_watcher_;
  60   base::FilePathWatcher recommended_watcher_;
  61
  62   DISALLOW_COPY_AND_ASSIGN(ConfigDirPolicyLoader);
  63 };
  64
  65 }  // namespace policy
  66
  67 #endif  // COMPONENTS_POLICY_CORE_COMMON_CONFIG_DIR_POLICY_LOADER_H_