| /* |
| * Copyright (C) 2018 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 com.android.server.appbinding; |
| |
| import android.annotation.NonNull; |
| import android.annotation.Nullable; |
| import android.content.Intent; |
| import android.content.pm.IPackageManager; |
| import android.content.pm.ParceledListSlice; |
| import android.content.pm.ResolveInfo; |
| import android.content.pm.ServiceInfo; |
| import android.os.RemoteException; |
| import android.util.Log; |
| |
| import java.util.List; |
| |
| /** |
| * Utility class to find a persistent bound service within an app. |
| */ |
| public class AppBindingUtils { |
| private static final String TAG = "AppBindingUtils"; |
| private AppBindingUtils() { |
| } |
| |
| /** |
| * Find a service with the action {@code serviceAction} in the package {@code packageName}. |
| * Returns null in any of the following cases. |
| * - No service with the action is found. |
| * - More than 1 service with the action is found. |
| * - Found service is not protected with the permission {@code servicePermission}. |
| */ |
| @Nullable |
| public static ServiceInfo findService(@NonNull String packageName, int userId, |
| String serviceAction, String servicePermission, |
| Class<?> serviceClassForLogging, |
| IPackageManager ipm, |
| StringBuilder errorMessage) { |
| final String simpleClassName = serviceClassForLogging.getSimpleName(); |
| final Intent intent = new Intent(serviceAction); |
| intent.setPackage(packageName); |
| |
| errorMessage.setLength(0); // Clear it. |
| try { |
| final ParceledListSlice<ResolveInfo> pls = ipm |
| .queryIntentServices(intent, null, /* flags=*/ 0, userId); |
| if (pls == null || pls.getList().size() == 0) { |
| errorMessage.append("Service with " + serviceAction + " not found."); |
| return null; |
| } |
| final List<ResolveInfo> list = pls.getList(); |
| // Note if multiple services are found, that's an error, even if only one of them |
| // is exported. |
| if (list.size() > 1) { |
| errorMessage.append("More than one " + simpleClassName + "'s found in package " |
| + packageName + ". They'll all be ignored."); |
| Log.e(TAG, errorMessage.toString()); |
| return null; |
| } |
| final ServiceInfo si = list.get(0).serviceInfo; |
| |
| if (!servicePermission.equals(si.permission)) { |
| errorMessage.append(simpleClassName + " " |
| + si.getComponentName().flattenToShortString() |
| + " must be protected with " + servicePermission |
| + "."); |
| Log.e(TAG, errorMessage.toString()); |
| return null; |
| } |
| return si; |
| } catch (RemoteException e) { |
| // Shouldn't happen |
| } |
| return null; |
| } |
| } |