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// Copyright (c) 2013 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_RENDERER_HOST_PEPPER_DEVICE_ID_FETCHER_H_
#define CHROME_BROWSER_RENDERER_HOST_PEPPER_DEVICE_ID_FETCHER_H_
#include <string>
#include "base/basictypes.h"
#include "base/callback.h"
#include "base/compiler_specific.h"
#include "base/files/file_path.h"
#include "base/memory/ref_counted.h"
#include "ppapi/c/pp_instance.h"
class Profile;
namespace content {
class BrowserPpapiHost;
}
namespace user_prefs {
class PrefRegistrySyncable;
}
namespace chrome {
// This class allows asynchronously fetching a unique device ID. The callback
// passed in when calling Start() will be called when the ID has been fetched
// or on error.
class DeviceIDFetcher : public base::RefCountedThreadSafe<DeviceIDFetcher> {
public:
typedef base::Callback<void(const std::string&, int32_t)> IDCallback;
explicit DeviceIDFetcher(int render_process_id);
// Schedules the request operation. Returns false if a request is in progress,
// true otherwise.
bool Start(const IDCallback& callback);
// Called to register the |kEnableDRM| and |kDRMSalt| preferences.
static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* prefs);
// Return the path where the legacy device ID is stored (for ChromeOS only).
static base::FilePath GetLegacyDeviceIDPath(
const base::FilePath& profile_path);
private:
~DeviceIDFetcher();
// Checks the preferences for DRM (whether DRM is enabled and getting the drm
// salt) on the UI thread.
void CheckPrefsOnUIThread();
// Compute the device ID on the UI thread with the given salt and machine ID.
void ComputeOnUIThread(const std::string& salt,
const std::string& machine_id);
// Legacy method used to get the device ID for ChromeOS.
void LegacyComputeOnBlockingPool(const base::FilePath& profile_path,
const std::string& salt);
// Runs the callback passed into Start() on the IO thread with the device ID
// or the empty string on failure.
void RunCallbackOnIOThread(const std::string& id,
int32_t result);
friend class base::RefCountedThreadSafe<DeviceIDFetcher>;
// The callback to run when the ID has been fetched.
IDCallback callback_;
// Whether a request is in progress.
bool in_progress_;
int render_process_id_;
DISALLOW_COPY_AND_ASSIGN(DeviceIDFetcher);
};
} // namespace chrome
#endif // CHROME_BROWSER_RENDERER_HOST_PEPPER_DEVICE_ID_FETCHER_H_
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