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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_EXTENSIONS_EXTERNAL_PREF_EXTENSION_LOADER_H_
#define CHROME_BROWSER_EXTENSIONS_EXTERNAL_PREF_EXTENSION_LOADER_H_
#include "chrome/browser/extensions/external_extension_loader.h"
#include <string>
#include "base/compiler_specific.h"
#include "base/memory/scoped_ptr.h"
#include "base/values.h"
// A specialization of the ExternalExtensionLoader that uses a json file to
// look up which external extensions are registered.
// Instances of this class are expected to be created and destroyed on the UI
// thread and they are expecting public method calls from the UI thread.
class ExternalPrefExtensionLoader : public ExternalExtensionLoader {
public:
enum Options {
NONE = 0,
// Ensure that only root can force an external install by checking
// that all components of the path to external extensions files are
// owned by root and not writable by any non-root user.
ENSURE_PATH_CONTROLLED_BY_ADMIN = 1 << 0
};
// |base_path_id| is the directory containing the external_extensions.json
// file or the standalone extension manifest files. Relative file paths to
// extension files are resolved relative to this path.
explicit ExternalPrefExtensionLoader(int base_path_id, Options options);
virtual const FilePath GetBaseCrxFilePath() OVERRIDE;
protected:
virtual void StartLoading() OVERRIDE;
bool IsOptionSet(Options option) {
return (options_ & option) != 0;
}
private:
friend class base::RefCountedThreadSafe<ExternalExtensionLoader>;
virtual ~ExternalPrefExtensionLoader() {}
// Actually searches for and loads candidate standalone extension preference
// files in the path corresponding to |base_path_id|.
// Must be called on the file thread.
void LoadOnFileThread();
// Extracts the information contained in an external_extension.json file
// regarding which extensions to install. |prefs| will be modified to
// receive the extracted extension information.
// Must be called from the File thread.
void ReadExternalExtensionPrefFile(DictionaryValue * prefs);
// Extracts the information contained in standalone external extension
// json files (<extension id>.json) regarding what external extensions
// to install. |prefs| will be modified to receive the extracted extension
// information.
// Must be called from the File thread.
void ReadStandaloneExtensionPrefFiles(DictionaryValue * prefs);
// The resource id of the base path with the information about the json
// file containing which extensions to load.
int base_path_id_;
Options options_;
// The path (coresponding to |base_path_id_| containing the json files
// describing which extensions to load.
FilePath base_path_;
DISALLOW_COPY_AND_ASSIGN(ExternalPrefExtensionLoader);
};
// A simplified version of ExternalPrefExtensionLoader that loads the dictionary
// from json data specified in a string.
class ExternalTestingExtensionLoader : public ExternalExtensionLoader {
public:
ExternalTestingExtensionLoader(
const std::string& json_data,
const FilePath& fake_base_path);
virtual const FilePath GetBaseCrxFilePath() OVERRIDE;
protected:
virtual void StartLoading() OVERRIDE;
private:
friend class base::RefCountedThreadSafe<ExternalExtensionLoader>;
virtual ~ExternalTestingExtensionLoader();
FilePath fake_base_path_;
scoped_ptr<DictionaryValue> testing_prefs_;
DISALLOW_COPY_AND_ASSIGN(ExternalTestingExtensionLoader);
};
#endif // CHROME_BROWSER_EXTENSIONS_EXTERNAL_PREF_EXTENSION_LOADER_H_
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