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      1 /*
      2  * Copyright (C) 2014 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.systemui.statusbar.phone;
     18 
     19 import android.content.Context;
     20 
     21 import com.android.internal.widget.LockPatternUtils;
     22 import com.android.keyguard.KeyguardUpdateMonitor;
     23 import com.android.keyguard.KeyguardUpdateMonitorCallback;
     24 
     25 import java.util.ArrayList;
     26 
     27 /**
     28  * Caches whether the current unlock method is insecure, taking trust into account. This information
     29  * might be a little bit out of date and should not be used for actual security decisions; it should
     30  * be only used for visual indications.
     31  */
     32 public class UnlockMethodCache {
     33 
     34     private static UnlockMethodCache sInstance;
     35 
     36     private final LockPatternUtils mLockPatternUtils;
     37     private final KeyguardUpdateMonitor mKeyguardUpdateMonitor;
     38     private final ArrayList<OnUnlockMethodChangedListener> mListeners = new ArrayList<>();
     39     /** Whether the user configured a secure unlock method (PIN, password, etc.) */
     40     private boolean mSecure;
     41     /** Whether the unlock method is currently insecure (insecure method or trusted environment) */
     42     private boolean mCanSkipBouncer;
     43     private boolean mTrustManaged;
     44     private boolean mFaceUnlockRunning;
     45     private boolean mTrusted;
     46 
     47     private UnlockMethodCache(Context ctx) {
     48         mLockPatternUtils = new LockPatternUtils(ctx);
     49         mKeyguardUpdateMonitor = KeyguardUpdateMonitor.getInstance(ctx);
     50         KeyguardUpdateMonitor.getInstance(ctx).registerCallback(mCallback);
     51         update(true /* updateAlways */);
     52     }
     53 
     54     public static UnlockMethodCache getInstance(Context context) {
     55         if (sInstance == null) {
     56             sInstance = new UnlockMethodCache(context);
     57         }
     58         return sInstance;
     59     }
     60 
     61     /**
     62      * @return whether the user configured a secure unlock method like PIN, password, etc.
     63      */
     64     public boolean isMethodSecure() {
     65         return mSecure;
     66     }
     67 
     68     public boolean isTrusted() {
     69         return mTrusted;
     70     }
     71 
     72     /**
     73      * @return whether the lockscreen is currently insecure, and the bouncer won't be shown
     74      */
     75     public boolean canSkipBouncer() {
     76         return mCanSkipBouncer;
     77     }
     78 
     79     public void addListener(OnUnlockMethodChangedListener listener) {
     80         mListeners.add(listener);
     81     }
     82 
     83     public void removeListener(OnUnlockMethodChangedListener listener) {
     84         mListeners.remove(listener);
     85     }
     86 
     87     private void update(boolean updateAlways) {
     88         int user = KeyguardUpdateMonitor.getCurrentUser();
     89         boolean secure = mLockPatternUtils.isSecure(user);
     90         boolean canSkipBouncer = !secure ||  mKeyguardUpdateMonitor.getUserCanSkipBouncer(user);
     91         boolean trustManaged = mKeyguardUpdateMonitor.getUserTrustIsManaged(user);
     92         boolean trusted = mKeyguardUpdateMonitor.getUserHasTrust(user);
     93         boolean faceUnlockRunning = mKeyguardUpdateMonitor.isFaceUnlockRunning(user)
     94                 && trustManaged;
     95         boolean changed = secure != mSecure || canSkipBouncer != mCanSkipBouncer ||
     96                 trustManaged != mTrustManaged  || faceUnlockRunning != mFaceUnlockRunning;
     97         if (changed || updateAlways) {
     98             mSecure = secure;
     99             mCanSkipBouncer = canSkipBouncer;
    100             mTrusted = trusted;
    101             mTrustManaged = trustManaged;
    102             mFaceUnlockRunning = faceUnlockRunning;
    103             notifyListeners();
    104         }
    105     }
    106 
    107     private void notifyListeners() {
    108         for (OnUnlockMethodChangedListener listener : mListeners) {
    109             listener.onUnlockMethodStateChanged();
    110         }
    111     }
    112 
    113     private final KeyguardUpdateMonitorCallback mCallback = new KeyguardUpdateMonitorCallback() {
    114         @Override
    115         public void onUserSwitchComplete(int userId) {
    116             update(false /* updateAlways */);
    117         }
    118 
    119         @Override
    120         public void onTrustChanged(int userId) {
    121             update(false /* updateAlways */);
    122         }
    123 
    124         @Override
    125         public void onTrustManagedChanged(int userId) {
    126             update(false /* updateAlways */);
    127         }
    128 
    129         @Override
    130         public void onStartedWakingUp() {
    131             update(false /* updateAlways */);
    132         }
    133 
    134         @Override
    135         public void onFingerprintAuthenticated(int userId, boolean wakeAndUnlocking) {
    136             if (!mKeyguardUpdateMonitor.isUnlockingWithFingerprintAllowed()) {
    137                 return;
    138             }
    139             update(false /* updateAlways */);
    140         }
    141 
    142         @Override
    143         public void onFaceUnlockStateChanged(boolean running, int userId) {
    144             update(false /* updateAlways */);
    145         }
    146     };
    147 
    148     public boolean isTrustManaged() {
    149         return mTrustManaged;
    150     }
    151 
    152     public boolean isFaceUnlockRunning() {
    153         return mFaceUnlockRunning;
    154     }
    155 
    156     public static interface OnUnlockMethodChangedListener {
    157         void onUnlockMethodStateChanged();
    158     }
    159 }
    160