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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 CHROMEOS_DBUS_PERMISSION_BROKER_CLIENT_H_
#define CHROMEOS_DBUS_PERMISSION_BROKER_CLIENT_H_
#include <string>
#include "base/basictypes.h"
#include "base/callback.h"
#include "chromeos/chromeos_export.h"
#include "chromeos/dbus/dbus_client.h"
namespace chromeos {
// PermissionBrokerClient is used to communicate with the permission broker, a
// process that allows requesting permission to access specific device nodes.
// For example, one place that this client is used is within the USB extension
// API code, where it is used to request explicit access to USB peripherals
// which the user the browser runs under normally wouldn't have access to. For
// more details on the permission broker see:
// http://git.chromium.org/gitweb/?p=chromiumos/platform/permission_broker.git
class CHROMEOS_EXPORT PermissionBrokerClient : public DBusClient {
public:
// The ResultCallback is used for both the RequestPathAccess and
// RequestUsbAcess methods. Its boolean parameter represents the result of the
// operation that it was submitted alongside.
typedef base::Callback<void(bool)> ResultCallback;
virtual ~PermissionBrokerClient();
static PermissionBrokerClient* Create();
// RequestPathAccess requests access to a single device node identified by
// |path|. If |interface_id| value is passed (different than
// UsbDevicePermissionData::ANY_INTERFACE), the request will check if a
// specific interface is claimed while requesting access.
// This allows devices with multiple interfaces to be accessed even if
// some of them are already claimed by kernel.
virtual void RequestPathAccess(const std::string& path,
int interface_id,
const ResultCallback& callback) = 0;
// RequestUsbAccess attempts to request access to _all_ USB devices attached
// to the system that match |vendor_id| and |product_id|. If |interface_id| is
// passed (not -1), the request will check if a specific interface is claimed
// while requesting access. This allows devices with multiple interfaces to be
// accessed even if some of them are already claimed by kernel.
// This call makes no attempt to guarantee atomicity, and partial failure is
// indistinguishable from complete failure.
virtual void RequestUsbAccess(uint16_t vendor_id,
uint16_t product_id,
int interface_id,
const ResultCallback& callback) = 0;
protected:
PermissionBrokerClient();
private:
DISALLOW_COPY_AND_ASSIGN(PermissionBrokerClient);
};
} // namespace chromeos
#endif // CHROMEOS_DBUS_PERMISSION_BROKER_CLIENT_H_
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