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.car.settings.security; 18 19 import android.annotation.WorkerThread; 20 import android.os.AsyncTask; 21 import android.os.Bundle; 22 import android.support.annotation.VisibleForTesting; 23 import android.support.v4.app.Fragment; 24 25 import com.android.car.settings.common.Logger; 26 import com.android.internal.widget.LockPatternUtils; 27 28 /** 29 * An invisible retained worker fragment to track the AsyncWork that saves 30 * the chosen lock credential (pattern/pin/password). 31 */ 32 abstract class SaveLockWorkerBase extends Fragment { 33 /** 34 * Callback when lock save has finished 35 */ 36 interface Listener { onChosenLockSaveFinished(boolean isSaveSuccessful)37 void onChosenLockSaveFinished(boolean isSaveSuccessful); 38 } 39 40 private static final Logger LOG = new Logger(SaveLockWorkerBase.class); 41 42 private Listener mListener; 43 private boolean mFinished; 44 private boolean mIsSaveSuccessful; 45 private LockPatternUtils mUtils; 46 private int mUserId; 47 getUtils()48 final LockPatternUtils getUtils() { 49 return mUtils; 50 } 51 getUserId()52 final int getUserId() { 53 return mUserId; 54 } 55 isFinished()56 final boolean isFinished() { 57 return mFinished; 58 } 59 60 @Override onCreate(Bundle savedInstanceState)61 public void onCreate(Bundle savedInstanceState) { 62 super.onCreate(savedInstanceState); 63 setRetainInstance(true); 64 } 65 init(int userId)66 final void init(int userId) { 67 mUtils = new LockPatternUtils(getContext()); 68 mUserId = userId; 69 } 70 71 /** 72 * Start executing the async task. 73 */ start()74 final void start() { 75 mFinished = false; 76 new Task().executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR); 77 } 78 79 /** 80 * Set the listener to get callback when finished saving the chosen lock. 81 */ setListener(Listener listener)82 public void setListener(Listener listener) { 83 if (mListener != listener) { 84 mListener = listener; 85 if (mFinished && mListener != null) { 86 mListener.onChosenLockSaveFinished(mIsSaveSuccessful); 87 } 88 } 89 } 90 91 @VisibleForTesting(otherwise = VisibleForTesting.PRIVATE) saveAndVerifyInBackground(Void... params)92 boolean saveAndVerifyInBackground(Void... params) { 93 boolean isSaveSuccessful = true; 94 95 try { 96 saveLock(); 97 } catch (Exception e) { 98 LOG.e("Save lock exception", e); 99 isSaveSuccessful = false; 100 } 101 102 return isSaveSuccessful; 103 } 104 finish(boolean isSaveSuccessful)105 private void finish(boolean isSaveSuccessful) { 106 mFinished = true; 107 mIsSaveSuccessful = isSaveSuccessful; 108 if (mListener != null) { 109 mListener.onChosenLockSaveFinished(isSaveSuccessful); 110 } 111 } 112 113 /** 114 * Executes the save and verify work in background. 115 */ 116 @WorkerThread saveLock()117 abstract void saveLock(); 118 119 // Save chosen lock task. 120 private class Task extends AsyncTask<Void, Void, Boolean> { 121 @Override doInBackground(Void... params)122 protected Boolean doInBackground(Void... params) { 123 return saveAndVerifyInBackground(); 124 } 125 126 @Override onPostExecute(Boolean isSaveSuccessful)127 protected void onPostExecute(Boolean isSaveSuccessful) { 128 finish(isSaveSuccessful); 129 } 130 } 131 } 132