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.os.Bundle;
20 
21 import androidx.fragment.app.Fragment;
22 
23 import com.android.car.settings.common.Logger;
24 import com.android.internal.widget.LockPatternChecker;
25 import com.android.internal.widget.LockPatternUtils;
26 import com.android.internal.widget.LockPatternView;
27 
28 import java.util.List;
29 
30 /**
31  * An invisible retained worker fragment to track the AsyncTask that checks the entered lock
32  * credential (pattern/pin/password).
33  */
34 public class CheckLockWorker extends Fragment implements LockPatternChecker.OnCheckCallback {
35 
36     private static final Logger LOG = new Logger(CheckLockWorker.class);
37 
38     private boolean mHasPendingResult;
39     private boolean mLockMatched;
40     private boolean mCheckInProgress;
41     private Listener mListener;
42     private LockPatternUtils mLockPatternUtils;
43 
44     @Override
onCreate(Bundle savedInstanceState)45     public void onCreate(Bundle savedInstanceState) {
46         super.onCreate(savedInstanceState);
47         setRetainInstance(true);
48         mLockPatternUtils = new LockPatternUtils(getContext());
49     }
50 
51     @Override
onChecked(boolean matched, int throttleTimeoutMs)52     public void onChecked(boolean matched, int throttleTimeoutMs) {
53         mCheckInProgress = false;
54 
55         if (mListener == null) {
56             mHasPendingResult = true;
57             mLockMatched = matched;
58         } else {
59             mListener.onCheckCompleted(matched);
60         }
61     }
62 
63     /**
64      * Sets the listener for callback when lock check is completed.
65      */
setListener(Listener listener)66     public void setListener(Listener listener) {
67         mListener = listener;
68         if (mListener != null && mHasPendingResult) {
69             mHasPendingResult = false;
70             mListener.onCheckCompleted(mLockMatched);
71         }
72     }
73 
74     /** Returns whether a lock check is in progress. */
isCheckInProgress()75     public final boolean isCheckInProgress() {
76         return mCheckInProgress;
77     }
78 
79     /**
80      * Checks lock pattern asynchronously. To receive callback when check is completed,
81      * implement {@link Listener} and call {@link #setListener(Listener)}.
82      */
checkPattern(int userId, List<LockPatternView.Cell> pattern)83     public final void checkPattern(int userId, List<LockPatternView.Cell> pattern) {
84         if (mCheckInProgress) {
85             LOG.w("Check pattern request issued while one is still running");
86             return;
87         }
88 
89         mCheckInProgress = true;
90         LockPatternChecker.checkPattern(mLockPatternUtils, pattern, userId, this);
91     }
92 
93     /**
94      * Checks lock PIN/password asynchronously.  To receive callback when check is completed,
95      * implement {@link Listener} and call {@link #setListener(Listener)}.
96      */
checkPinPassword(int userId, byte[] password)97     public final void checkPinPassword(int userId, byte[] password) {
98         if (mCheckInProgress) {
99             LOG.w("Check pin/password request issued while one is still running");
100             return;
101         }
102         mCheckInProgress = true;
103         LockPatternChecker.checkPassword(mLockPatternUtils, password, userId, this);
104     }
105 
106     /**
107      * Callback when lock check is completed.
108      */
109     interface Listener {
110         /**
111          * @param matched Whether the entered password matches the stored record.
112          */
onCheckCompleted(boolean matched)113         void onCheckCompleted(boolean matched);
114     }
115 }
116 
117