1/*
2 * Copyright (C) 2012 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 */
16package com.android.keyguard;
17
18import android.app.admin.DevicePolicyManager;
19import android.content.Context;
20import android.telephony.SubscriptionManager;
21
22import com.android.internal.telephony.IccCardConstants;
23import com.android.internal.widget.LockPatternUtils;
24
25public class KeyguardSecurityModel {
26
27    /**
28     * The different types of security available.
29     * @see KeyguardSecurityContainer#showSecurityScreen
30     */
31    public enum SecurityMode {
32        Invalid, // NULL state
33        None, // No security enabled
34        Pattern, // Unlock by drawing a pattern.
35        Password, // Unlock by entering an alphanumeric password
36        PIN, // Strictly numeric password
37        SimPin, // Unlock by entering a sim pin.
38        SimPuk // Unlock by entering a sim puk
39    }
40
41    private final Context mContext;
42    private final boolean mIsPukScreenAvailable;
43
44    private LockPatternUtils mLockPatternUtils;
45
46    KeyguardSecurityModel(Context context) {
47        mContext = context;
48        mLockPatternUtils = new LockPatternUtils(context);
49        mIsPukScreenAvailable = mContext.getResources().getBoolean(
50                com.android.internal.R.bool.config_enable_puk_unlock_screen);
51    }
52
53    void setLockPatternUtils(LockPatternUtils utils) {
54        mLockPatternUtils = utils;
55    }
56
57    SecurityMode getSecurityMode() {
58        KeyguardUpdateMonitor monitor = KeyguardUpdateMonitor.getInstance(mContext);
59
60        if (SubscriptionManager.isValidSubscriptionId(
61                monitor.getNextSubIdForState(IccCardConstants.State.PIN_REQUIRED))) {
62            return SecurityMode.SimPin;
63        }
64
65        if (mIsPukScreenAvailable && SubscriptionManager.isValidSubscriptionId(
66                monitor.getNextSubIdForState(IccCardConstants.State.PUK_REQUIRED))) {
67            return SecurityMode.SimPuk;
68        }
69
70        final int security = mLockPatternUtils.getActivePasswordQuality(
71                KeyguardUpdateMonitor.getCurrentUser());
72        switch (security) {
73            case DevicePolicyManager.PASSWORD_QUALITY_NUMERIC:
74            case DevicePolicyManager.PASSWORD_QUALITY_NUMERIC_COMPLEX:
75                return SecurityMode.PIN;
76
77            case DevicePolicyManager.PASSWORD_QUALITY_ALPHABETIC:
78            case DevicePolicyManager.PASSWORD_QUALITY_ALPHANUMERIC:
79            case DevicePolicyManager.PASSWORD_QUALITY_COMPLEX:
80            case DevicePolicyManager.PASSWORD_QUALITY_MANAGED:
81                return SecurityMode.Password;
82
83            case DevicePolicyManager.PASSWORD_QUALITY_SOMETHING:
84                return SecurityMode.Pattern;
85            case DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED:
86                return SecurityMode.None;
87
88            default:
89                throw new IllegalStateException("Unknown security quality:" + security);
90        }
91    }
92}
93