Makoto Onuki | 87d260a | 2018-09-26 16:58:32 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2018 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package com.android.server.appbinding; |
| 18 | |
| 19 | import android.annotation.NonNull; |
| 20 | import android.annotation.Nullable; |
| 21 | import android.content.Intent; |
| 22 | import android.content.pm.IPackageManager; |
| 23 | import android.content.pm.ParceledListSlice; |
| 24 | import android.content.pm.ResolveInfo; |
| 25 | import android.content.pm.ServiceInfo; |
| 26 | import android.os.RemoteException; |
| 27 | import android.util.Log; |
| 28 | |
| 29 | import java.util.List; |
| 30 | |
| 31 | /** |
| 32 | * Utility class to find a persistent bound service within an app. |
| 33 | */ |
| 34 | public class AppBindingUtils { |
| 35 | private static final String TAG = "AppBindingUtils"; |
| 36 | private AppBindingUtils() { |
| 37 | } |
| 38 | |
| 39 | /** |
| 40 | * Find a service with the action {@code serviceAction} in the package {@code packageName}. |
| 41 | * Returns null in any of the following cases. |
| 42 | * - No service with the action is found. |
| 43 | * - More than 1 service with the action is found. |
| 44 | * - Found service is not protected with the permission {@code servicePermission}. |
| 45 | */ |
| 46 | @Nullable |
| 47 | public static ServiceInfo findService(@NonNull String packageName, int userId, |
| 48 | String serviceAction, String servicePermission, |
| 49 | Class<?> serviceClassForLogging, |
| 50 | IPackageManager ipm, |
| 51 | StringBuilder errorMessage) { |
| 52 | final String simpleClassName = serviceClassForLogging.getSimpleName(); |
| 53 | final Intent intent = new Intent(serviceAction); |
| 54 | intent.setPackage(packageName); |
| 55 | |
| 56 | errorMessage.setLength(0); // Clear it. |
| 57 | try { |
| 58 | final ParceledListSlice<ResolveInfo> pls = ipm |
| 59 | .queryIntentServices(intent, null, /* flags=*/ 0, userId); |
| 60 | if (pls == null || pls.getList().size() == 0) { |
| 61 | errorMessage.append("Service with " + serviceAction + " not found."); |
| 62 | return null; |
| 63 | } |
| 64 | final List<ResolveInfo> list = pls.getList(); |
| 65 | // Note if multiple services are found, that's an error, even if only one of them |
| 66 | // is exported. |
| 67 | if (list.size() > 1) { |
| 68 | errorMessage.append("More than one " + simpleClassName + "'s found in package " |
| 69 | + packageName + ". They'll all be ignored."); |
| 70 | Log.e(TAG, errorMessage.toString()); |
| 71 | return null; |
| 72 | } |
| 73 | final ServiceInfo si = list.get(0).serviceInfo; |
| 74 | |
| 75 | if (!servicePermission.equals(si.permission)) { |
| 76 | errorMessage.append(simpleClassName + " " |
| 77 | + si.getComponentName().flattenToShortString() |
| 78 | + " must be protected with " + servicePermission |
| 79 | + "."); |
| 80 | Log.e(TAG, errorMessage.toString()); |
| 81 | return null; |
| 82 | } |
| 83 | return si; |
| 84 | } catch (RemoteException e) { |
| 85 | // Shouldn't happen |
| 86 | } |
| 87 | return null; |
| 88 | } |
| 89 | } |