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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     29  * might be a little bit out of date and should not be used for actual security decisions; it should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     private boolean mMethodInsecure;
     40     private boolean mTrustManaged;
     41     private boolean mFaceUnlockRunning;
     42 
     43     private UnlockMethodCache(Context ctx) {
     44         mLockPatternUtils = new LockPatternUtils(ctx);
     45         mKeyguardUpdateMonitor = KeyguardUpdateMonitor.getInstance(ctx);
     46         KeyguardUpdateMonitor.getInstance(ctx).registerCallback(mCallback);
     47         updateMethodSecure(true /* updateAlways */);
     48     }
     49 
     50     public static UnlockMethodCache getInstance(Context context) {
     51         if (sInstance == null) {
     52             sInstance = new UnlockMethodCache(context);
     53         }
     54         return sInstance;
     55     }
     56 
     57     /**
     58      * @return whether the current security method is secure, i. e. the bouncer will be shown
     59      */
     60     public boolean isMethodInsecure() {
     61         return mMethodInsecure;
     62     }
     63 
     64     public void addListener(OnUnlockMethodChangedListener listener) {
     65         mListeners.add(listener);
     66     }
     67 
     68     public void removeListener(OnUnlockMethodChangedListener listener) {
     69         mListeners.remove(listener);
     70     }
     71 
     72     private void updateMethodSecure(boolean updateAlways) {
     73         int user = mLockPatternUtils.getCurrentUser();
     74         boolean methodInsecure = !mLockPatternUtils.isSecure() ||
     75                 mKeyguardUpdateMonitor.getUserHasTrust(user);
     76         boolean trustManaged = mKeyguardUpdateMonitor.getUserTrustIsManaged(user);
     77         boolean faceUnlockRunning = mKeyguardUpdateMonitor.isFaceUnlockRunning(user)
     78                 && trustManaged;
     79         boolean changed = methodInsecure != mMethodInsecure || trustManaged != mTrustManaged
     80                 || faceUnlockRunning != mFaceUnlockRunning;
     81         if (changed || updateAlways) {
     82             mMethodInsecure = methodInsecure;
     83             mTrustManaged = trustManaged;
     84             mFaceUnlockRunning = faceUnlockRunning;
     85             notifyListeners(mMethodInsecure);
     86         }
     87     }
     88 
     89     private void notifyListeners(boolean secure) {
     90         for (OnUnlockMethodChangedListener listener : mListeners) {
     91             listener.onMethodSecureChanged(secure);
     92         }
     93     }
     94 
     95     private final KeyguardUpdateMonitorCallback mCallback = new KeyguardUpdateMonitorCallback() {
     96         @Override
     97         public void onUserSwitchComplete(int userId) {
     98             updateMethodSecure(false /* updateAlways */);
     99         }
    100 
    101         @Override
    102         public void onTrustChanged(int userId) {
    103             updateMethodSecure(false /* updateAlways */);
    104         }
    105 
    106         @Override
    107         public void onTrustManagedChanged(int userId) {
    108             updateMethodSecure(false /* updateAlways */);
    109         }
    110 
    111         @Override
    112         public void onScreenTurnedOn() {
    113             updateMethodSecure(false /* updateAlways */);
    114         }
    115 
    116         @Override
    117         public void onFingerprintRecognized(int userId) {
    118             updateMethodSecure(false /* updateAlways */);
    119         }
    120 
    121         @Override
    122         public void onFaceUnlockStateChanged(boolean running, int userId) {
    123             updateMethodSecure(false /* updateAlways */);
    124         }
    125     };
    126 
    127     public boolean isTrustManaged() {
    128         return mTrustManaged;
    129     }
    130 
    131     public boolean isFaceUnlockRunning() {
    132         return mFaceUnlockRunning;
    133     }
    134 
    135     public static interface OnUnlockMethodChangedListener {
    136         void onMethodSecureChanged(boolean methodSecure);
    137     }
    138 }
    139