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/*
* Copyright 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.bluetooth;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.annotation.SuppressLint;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.os.Build;
import android.os.IBinder;
import android.os.RemoteException;
import android.os.UserHandle;
import android.util.CloseGuard;
import android.util.Log;
import java.util.List;
/**
* Connector for Bluetooth profile proxies to bind manager service and
* profile services
* @param <T> The Bluetooth profile interface for this connection.
* @hide
*/
@SuppressLint("AndroidFrameworkBluetoothPermission")
public abstract class BluetoothProfileConnector<T> {
private final CloseGuard mCloseGuard = new CloseGuard();
private final int mProfileId;
private BluetoothProfile.ServiceListener mServiceListener;
private final BluetoothProfile mProfileProxy;
private Context mContext;
private final String mProfileName;
private final String mServiceName;
private volatile T mService;
// -3 match with UserHandle.USER_CURRENT_OR_SELF
private static final UserHandle USER_HANDLE_CURRENT_OR_SELF = UserHandle.of(-3);
private final IBluetoothStateChangeCallback mBluetoothStateChangeCallback =
new IBluetoothStateChangeCallback.Stub() {
public void onBluetoothStateChange(boolean up) {
if (up) {
doBind();
} else {
doUnbind();
}
}
};
private @Nullable ComponentName resolveSystemService(@NonNull Intent intent,
@NonNull PackageManager pm, @PackageManager.ComponentInfoFlags int flags) {
List<ResolveInfo> results = pm.queryIntentServices(intent, flags);
if (results == null) {
return null;
}
ComponentName comp = null;
for (int i = 0; i < results.size(); i++) {
ResolveInfo ri = results.get(i);
if ((ri.serviceInfo.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) == 0) {
continue;
}
ComponentName foundComp = new ComponentName(ri.serviceInfo.applicationInfo.packageName,
ri.serviceInfo.name);
if (comp != null) {
throw new IllegalStateException("Multiple system services handle " + intent
+ ": " + comp + ", " + foundComp);
}
comp = foundComp;
}
return comp;
}
private final ServiceConnection mConnection = new ServiceConnection() {
public void onServiceConnected(ComponentName className, IBinder service) {
logDebug("Proxy object connected");
mService = getServiceInterface(service);
if (mServiceListener != null) {
mServiceListener.onServiceConnected(mProfileId, mProfileProxy);
}
}
public void onServiceDisconnected(ComponentName className) {
logDebug("Proxy object disconnected");
doUnbind();
if (mServiceListener != null) {
mServiceListener.onServiceDisconnected(mProfileId);
}
}
};
BluetoothProfileConnector(BluetoothProfile profile, int profileId, String profileName,
String serviceName) {
mProfileId = profileId;
mProfileProxy = profile;
mProfileName = profileName;
mServiceName = serviceName;
}
/** {@hide} */
@Override
public void finalize() {
mCloseGuard.warnIfOpen();
doUnbind();
}
@SuppressLint("AndroidFrameworkRequiresPermission")
private boolean doBind() {
synchronized (mConnection) {
if (mService == null) {
logDebug("Binding service...");
mCloseGuard.open("doUnbind");
try {
Intent intent = new Intent(mServiceName);
ComponentName comp = resolveSystemService(intent, mContext.getPackageManager(),
0);
intent.setComponent(comp);
if (comp == null || !mContext.bindServiceAsUser(intent, mConnection, 0,
USER_HANDLE_CURRENT_OR_SELF)) {
logError("Could not bind to Bluetooth Service with " + intent);
return false;
}
} catch (SecurityException se) {
logError("Failed to bind service. " + se);
return false;
}
}
}
return true;
}
private void doUnbind() {
synchronized (mConnection) {
if (mService != null) {
logDebug("Unbinding service...");
mCloseGuard.close();
try {
mContext.unbindService(mConnection);
} catch (IllegalArgumentException ie) {
logError("Unable to unbind service: " + ie);
} finally {
mService = null;
}
}
}
}
void connect(Context context, BluetoothProfile.ServiceListener listener) {
mContext = context;
mServiceListener = listener;
IBluetoothManager mgr = BluetoothAdapter.getDefaultAdapter().getBluetoothManager();
// Preserve legacy compatibility where apps were depending on
// registerStateChangeCallback() performing a permissions check which
// has been relaxed in modern platform versions
if (context.getApplicationInfo().targetSdkVersion <= Build.VERSION_CODES.R
&& context.checkSelfPermission(android.Manifest.permission.BLUETOOTH)
!= PackageManager.PERMISSION_GRANTED) {
throw new SecurityException("Need BLUETOOTH permission");
}
if (mgr != null) {
try {
mgr.registerStateChangeCallback(mBluetoothStateChangeCallback);
} catch (RemoteException re) {
logError("Failed to register state change callback. " + re);
}
}
doBind();
}
void disconnect() {
mServiceListener = null;
IBluetoothManager mgr = BluetoothAdapter.getDefaultAdapter().getBluetoothManager();
if (mgr != null) {
try {
mgr.unregisterStateChangeCallback(mBluetoothStateChangeCallback);
} catch (RemoteException re) {
logError("Failed to unregister state change callback" + re);
}
}
doUnbind();
}
T getService() {
return mService;
}
/**
* This abstract function is used to implement method to get the
* connected Bluetooth service interface.
* @param service the connected binder service.
* @return T the binder interface of {@code service}.
* @hide
*/
public abstract T getServiceInterface(IBinder service);
private void logDebug(String log) {
Log.d(mProfileName, log);
}
private void logError(String log) {
Log.e(mProfileName, log);
}
}
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