1/*
2 * Copyright (C) 2017 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.settings.security.screenlock;
18
19import static android.provider.Settings.System.SCREEN_OFF_TIMEOUT;
20
21import android.app.admin.DevicePolicyManager;
22import android.content.Context;
23import android.os.UserHandle;
24import android.provider.Settings;
25import android.support.v7.preference.Preference;
26import android.text.TextUtils;
27import android.util.Log;
28
29import com.android.internal.widget.LockPatternUtils;
30import com.android.settings.R;
31import com.android.settings.TimeoutListPreference;
32import com.android.settings.core.PreferenceControllerMixin;
33import com.android.settings.overlay.FeatureFactory;
34import com.android.settings.security.trustagent.TrustAgentManager;
35import com.android.settingslib.RestrictedLockUtils;
36import com.android.settingslib.core.AbstractPreferenceController;
37
38public class LockAfterTimeoutPreferenceController extends AbstractPreferenceController
39        implements PreferenceControllerMixin, Preference.OnPreferenceChangeListener {
40
41    private static final String KEY_LOCK_AFTER_TIMEOUT = "lock_after_timeout";
42
43    private final int mUserId;
44    private final LockPatternUtils mLockPatternUtils;
45    private final TrustAgentManager mTrustAgentManager;
46    private final DevicePolicyManager mDPM;
47
48    public LockAfterTimeoutPreferenceController(Context context, int userId,
49            LockPatternUtils lockPatternUtils) {
50        super(context);
51        mUserId = userId;
52        mLockPatternUtils = lockPatternUtils;
53        mDPM = (DevicePolicyManager) context.getSystemService(Context.DEVICE_POLICY_SERVICE);
54        mTrustAgentManager = FeatureFactory.getFactory(context)
55                .getSecurityFeatureProvider().getTrustAgentManager();
56    }
57
58    @Override
59    public boolean isAvailable() {
60        if (!mLockPatternUtils.isSecure(mUserId)) {
61            return false;
62        }
63        switch (mLockPatternUtils.getKeyguardStoredPasswordQuality(mUserId)) {
64            case DevicePolicyManager.PASSWORD_QUALITY_SOMETHING:
65            case DevicePolicyManager.PASSWORD_QUALITY_NUMERIC:
66            case DevicePolicyManager.PASSWORD_QUALITY_NUMERIC_COMPLEX:
67            case DevicePolicyManager.PASSWORD_QUALITY_ALPHABETIC:
68            case DevicePolicyManager.PASSWORD_QUALITY_ALPHANUMERIC:
69            case DevicePolicyManager.PASSWORD_QUALITY_COMPLEX:
70            case DevicePolicyManager.PASSWORD_QUALITY_MANAGED:
71                return true;
72            default:
73                return false;
74        }
75    }
76
77    @Override
78    public String getPreferenceKey() {
79        return KEY_LOCK_AFTER_TIMEOUT;
80    }
81
82    @Override
83    public void updateState(Preference preference) {
84        setupLockAfterPreference((TimeoutListPreference) preference);
85        updateLockAfterPreferenceSummary((TimeoutListPreference) preference);
86    }
87
88    @Override
89    public boolean onPreferenceChange(Preference preference, Object newValue) {
90        try {
91            final int timeout = Integer.parseInt((String) newValue);
92            Settings.Secure.putInt(mContext.getContentResolver(),
93                    Settings.Secure.LOCK_SCREEN_LOCK_AFTER_TIMEOUT, timeout);
94            updateState(preference);
95        } catch (NumberFormatException e) {
96            Log.e(TAG, "could not persist lockAfter timeout setting", e);
97        }
98        return true;
99    }
100
101    private void setupLockAfterPreference(TimeoutListPreference preference) {
102        // Compatible with pre-Froyo
103        long currentTimeout = Settings.Secure.getLong(mContext.getContentResolver(),
104                Settings.Secure.LOCK_SCREEN_LOCK_AFTER_TIMEOUT, 5000);
105        preference.setValue(String.valueOf(currentTimeout));
106        if (mDPM != null) {
107            final RestrictedLockUtils.EnforcedAdmin admin =
108                    RestrictedLockUtils.checkIfMaximumTimeToLockIsSet(mContext);
109            final long adminTimeout =
110                    mDPM.getMaximumTimeToLock(null /* admin */, UserHandle.myUserId());
111            final long displayTimeout = Math.max(0,
112                    Settings.System.getInt(mContext.getContentResolver(), SCREEN_OFF_TIMEOUT, 0));
113            // This setting is a slave to display timeout when a device policy is enforced.
114            // As such, maxLockTimeout = adminTimeout - displayTimeout.
115            // If there isn't enough time, shows "immediately" setting.
116            final long maxTimeout = Math.max(0, adminTimeout - displayTimeout);
117            preference.removeUnusableTimeouts(maxTimeout, admin);
118        }
119    }
120
121    private void updateLockAfterPreferenceSummary(TimeoutListPreference preference) {
122        final CharSequence summary;
123        if (preference.isDisabledByAdmin()) {
124            summary = mContext.getText(R.string.disabled_by_policy_title);
125        } else {
126            // Update summary message with current value
127            long currentTimeout = Settings.Secure.getLong(mContext.getContentResolver(),
128                    Settings.Secure.LOCK_SCREEN_LOCK_AFTER_TIMEOUT, 5000);
129            final CharSequence[] entries = preference.getEntries();
130            final CharSequence[] values = preference.getEntryValues();
131            int best = 0;
132            for (int i = 0; i < values.length; i++) {
133                long timeout = Long.valueOf(values[i].toString());
134                if (currentTimeout >= timeout) {
135                    best = i;
136                }
137            }
138
139            final CharSequence trustAgentLabel = mTrustAgentManager
140                    .getActiveTrustAgentLabel(mContext, mLockPatternUtils);
141            if (!TextUtils.isEmpty(trustAgentLabel)) {
142                if (Long.valueOf(values[best].toString()) == 0) {
143                    summary = mContext.getString(R.string.lock_immediately_summary_with_exception,
144                            trustAgentLabel);
145                } else {
146                    summary = mContext.getString(R.string.lock_after_timeout_summary_with_exception,
147                            entries[best], trustAgentLabel);
148                }
149            } else {
150                summary = mContext.getString(R.string.lock_after_timeout_summary, entries[best]);
151            }
152        }
153        preference.setSummary(summary);
154    }
155}
156