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
17package com.android.systemui.statusbar.phone;
18
19import android.content.Context;
20
21import com.android.internal.widget.LockPatternUtils;
22import com.android.keyguard.KeyguardUpdateMonitor;
23import com.android.keyguard.KeyguardUpdateMonitorCallback;
24
25import 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29 * might be a little bit out of date and should not be used for actual security decisions; it should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 */
32public 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