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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     29  * might be a little bit out of date and should not be used for actual security decisions; it should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 mCurrentlyInsecure;
     43     private boolean mTrustManaged;
     44     private boolean mFaceUnlockRunning;
     45 
     46     private UnlockMethodCache(Context ctx) {
     47         mLockPatternUtils = new LockPatternUtils(ctx);
     48         mKeyguardUpdateMonitor = KeyguardUpdateMonitor.getInstance(ctx);
     49         KeyguardUpdateMonitor.getInstance(ctx).registerCallback(mCallback);
     50         update(true /* updateAlways */);
     51     }
     52 
     53     public static UnlockMethodCache getInstance(Context context) {
     54         if (sInstance == null) {
     55             sInstance = new UnlockMethodCache(context);
     56         }
     57         return sInstance;
     58     }
     59 
     60     /**
     61      * @return whether the user configured a secure unlock method like PIN, password, etc.
     62      */
     63     public boolean isMethodSecure() {
     64         return mSecure;
     65     }
     66 
     67     /**
     68      * @return whether the lockscreen is currently insecure, i. e. the bouncer won't be shown
     69      */
     70     public boolean isCurrentlyInsecure() {
     71         return mCurrentlyInsecure;
     72     }
     73 
     74     public void addListener(OnUnlockMethodChangedListener listener) {
     75         mListeners.add(listener);
     76     }
     77 
     78     public void removeListener(OnUnlockMethodChangedListener listener) {
     79         mListeners.remove(listener);
     80     }
     81 
     82     private void update(boolean updateAlways) {
     83         int user = mLockPatternUtils.getCurrentUser();
     84         boolean secure = mLockPatternUtils.isSecure();
     85         boolean currentlyInsecure = !secure ||  mKeyguardUpdateMonitor.getUserHasTrust(user);
     86         boolean trustManaged = mKeyguardUpdateMonitor.getUserTrustIsManaged(user);
     87         boolean faceUnlockRunning = mKeyguardUpdateMonitor.isFaceUnlockRunning(user)
     88                 && trustManaged;
     89         boolean changed = secure != mSecure || currentlyInsecure != mCurrentlyInsecure ||
     90                 trustManaged != mTrustManaged  || faceUnlockRunning != mFaceUnlockRunning;
     91         if (changed || updateAlways) {
     92             mSecure = secure;
     93             mCurrentlyInsecure = currentlyInsecure;
     94             mTrustManaged = trustManaged;
     95             mFaceUnlockRunning = faceUnlockRunning;
     96             notifyListeners();
     97         }
     98     }
     99 
    100     private void notifyListeners() {
    101         for (OnUnlockMethodChangedListener listener : mListeners) {
    102             listener.onUnlockMethodStateChanged();
    103         }
    104     }
    105 
    106     private final KeyguardUpdateMonitorCallback mCallback = new KeyguardUpdateMonitorCallback() {
    107         @Override
    108         public void onUserSwitchComplete(int userId) {
    109             update(false /* updateAlways */);
    110         }
    111 
    112         @Override
    113         public void onTrustChanged(int userId) {
    114             update(false /* updateAlways */);
    115         }
    116 
    117         @Override
    118         public void onTrustManagedChanged(int userId) {
    119             update(false /* updateAlways */);
    120         }
    121 
    122         @Override
    123         public void onScreenTurnedOn() {
    124             update(false /* updateAlways */);
    125         }
    126 
    127         @Override
    128         public void onFingerprintRecognized(int userId) {
    129             update(false /* updateAlways */);
    130         }
    131 
    132         @Override
    133         public void onFaceUnlockStateChanged(boolean running, int userId) {
    134             update(false /* updateAlways */);
    135         }
    136     };
    137 
    138     public boolean isTrustManaged() {
    139         return mTrustManaged;
    140     }
    141 
    142     public boolean isFaceUnlockRunning() {
    143         return mFaceUnlockRunning;
    144     }
    145 
    146     public static interface OnUnlockMethodChangedListener {
    147         void onUnlockMethodStateChanged();
    148     }
    149 }
    150