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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 #ifndef CHROME_BROWSER_CHROMEOS_EXTENSIONS_DEVICE_LOCAL_ACCOUNT_EXTERNAL_POLICY_LOADER_H_
      6 #define CHROME_BROWSER_CHROMEOS_EXTENSIONS_DEVICE_LOCAL_ACCOUNT_EXTERNAL_POLICY_LOADER_H_
      7 
      8 #include "base/basictypes.h"
      9 #include "base/callback_forward.h"
     10 #include "base/compiler_specific.h"
     11 #include "base/files/file_path.h"
     12 #include "base/memory/ref_counted.h"
     13 #include "base/memory/scoped_ptr.h"
     14 #include "base/sequenced_task_runner.h"
     15 #include "chrome/browser/chromeos/extensions/external_cache.h"
     16 #include "chrome/browser/extensions/external_loader.h"
     17 #include "components/policy/core/common/cloud/cloud_policy_store.h"
     18 
     19 namespace chromeos {
     20 
     21 // A specialization of the ExternalLoader that serves external extensions from
     22 // the enterprise policy force-install list. This class is used for device-local
     23 // accounts in place of the ExternalPolicyLoader. The difference is that while
     24 // the ExternalPolicyLoader requires extensions to be downloaded on-the-fly,
     25 // this class caches them, allowing for offline installation.
     26 class DeviceLocalAccountExternalPolicyLoader
     27     : public extensions::ExternalLoader,
     28       public policy::CloudPolicyStore::Observer,
     29       public ExternalCache::Delegate {
     30  public:
     31   // The list of force-installed extensions will be read from |store| and the
     32   // extensions will be cached in the |cache_dir_|.
     33   DeviceLocalAccountExternalPolicyLoader(policy::CloudPolicyStore* store,
     34                                          const base::FilePath& cache_dir);
     35 
     36   // While running, the cache requires exclusive write access to the
     37   // |cache_dir_|.
     38   bool IsCacheRunning() const;
     39 
     40   // Start the cache. This method must only be invoked when there are no pending
     41   // write operations to |cache_dir_| on any thread and none will be initiated
     42   // while the cache is running.
     43   void StartCache(
     44       const scoped_refptr<base::SequencedTaskRunner>& cache_task_runner);
     45 
     46   // Stop the cache. The |callback| will be invoked when the cache has shut down
     47   // completely and write access to the |cache_dir_| is permitted again.
     48   void StopCache(const base::Closure& callback);
     49 
     50   // extensions::ExternalLoader:
     51   virtual void StartLoading() OVERRIDE;
     52 
     53   // policy::CloudPolicyStore::Observer:
     54   virtual void OnStoreLoaded(policy::CloudPolicyStore* store) OVERRIDE;
     55   virtual void OnStoreError(policy::CloudPolicyStore* store) OVERRIDE;
     56 
     57   // ExternalCache::Delegate:
     58   virtual void OnExtensionListsUpdated(
     59       const base::DictionaryValue* prefs) OVERRIDE;
     60 
     61   ExternalCache* GetExternalCacheForTesting();
     62 
     63  private:
     64   // If the cache was started, it must be stopped before |this| is destroyed.
     65   virtual ~DeviceLocalAccountExternalPolicyLoader();
     66 
     67   // Pass the current list of force-installed extensions from the |store_| to
     68   // the |external_cache_|.
     69   void UpdateExtensionListFromStore();
     70 
     71   policy::CloudPolicyStore* store_;
     72   const base::FilePath cache_dir_;
     73   scoped_ptr<ExternalCache> external_cache_;
     74 
     75   DISALLOW_COPY_AND_ASSIGN(DeviceLocalAccountExternalPolicyLoader);
     76 };
     77 
     78 }  // namespace chromeos
     79 
     80 #endif  // CHROME_BROWSER_CHROMEOS_EXTENSIONS_DEVICE_LOCAL_ACCOUNT_EXTERNAL_POLICY_LOADER_H_
     81