1 /*
2  * Copyright (C) 2019 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.settings.notification;
18 
19 import static android.app.admin.DevicePolicyManager.KEYGUARD_DISABLE_SECURE_NOTIFICATIONS;
20 import static android.app.admin.DevicePolicyManager.KEYGUARD_DISABLE_UNREDACTED_NOTIFICATIONS;
21 import static android.provider.Settings.Secure.LOCK_SCREEN_ALLOW_PRIVATE_NOTIFICATIONS;
22 
23 import android.app.KeyguardManager;
24 import android.content.Context;
25 import android.content.pm.UserInfo;
26 import android.database.ContentObserver;
27 import android.os.Handler;
28 import android.os.Looper;
29 import android.os.UserHandle;
30 import android.os.UserManager;
31 import android.provider.Settings;
32 
33 import androidx.preference.PreferenceScreen;
34 
35 import com.android.internal.widget.LockPatternUtils;
36 import com.android.settings.R;
37 import com.android.settings.core.TogglePreferenceController;
38 import com.android.settings.overlay.FeatureFactory;
39 import com.android.settingslib.RestrictedLockUtils;
40 import com.android.settingslib.RestrictedLockUtilsInternal;
41 import com.android.settingslib.RestrictedSwitchPreference;
42 import com.android.settingslib.core.lifecycle.LifecycleObserver;
43 import com.android.settingslib.core.lifecycle.events.OnStart;
44 import com.android.settingslib.core.lifecycle.events.OnStop;
45 
46 import java.util.List;
47 
48 /**
49  * The controller of the sensitive notifications.
50  */
51 public class RedactNotificationPreferenceController extends TogglePreferenceController implements
52         LifecycleObserver, OnStart, OnStop {
53     private static final String TAG = "LockScreenNotifPref";
54 
55     static final String KEY_LOCKSCREEN_REDACT = "lock_screen_redact";
56     static final String KEY_LOCKSCREEN_WORK_PROFILE_REDACT = "lock_screen_work_redact";
57 
58     private UserManager mUm;
59     private KeyguardManager mKm;
60     int mProfileUserId;
61     private RestrictedSwitchPreference mPreference;
62     private ContentObserver mContentObserver =
63             new ContentObserver(new Handler(Looper.getMainLooper())) {
64                 @Override
65                 public void onChange(boolean selfChange) {
66                     if (mPreference != null) {
67                         mPreference.setEnabled(
68                                 getAvailabilityStatus() != DISABLED_DEPENDENT_SETTING);
69                     }
70                 }
71             };
72 
RedactNotificationPreferenceController(Context context, String settingKey)73     public RedactNotificationPreferenceController(Context context, String settingKey) {
74         super(context, settingKey);
75 
76         mUm = context.getSystemService(UserManager.class);
77         mKm = context.getSystemService(KeyguardManager.class);
78 
79         mProfileUserId = UserHandle.myUserId();
80         final List<UserInfo> profiles = mUm.getProfiles(UserHandle.myUserId());
81         final int count = profiles.size();
82         for (int i = 0; i < count; i++) {
83             final UserInfo profile = profiles.get(i);
84             if (profile.isManagedProfile()
85                     && profile.getUserHandle().getIdentifier() !=  UserHandle.myUserId()) {
86                 mProfileUserId = profile.getUserHandle().getIdentifier();
87             }
88         }
89     }
90 
91     @Override
displayPreference(PreferenceScreen screen)92     public void displayPreference(PreferenceScreen screen) {
93         super.displayPreference(screen);
94         mPreference = screen.findPreference(getPreferenceKey());
95 
96         int userId = KEY_LOCKSCREEN_REDACT.equals(getPreferenceKey())
97                 ? UserHandle.myUserId() : mProfileUserId;
98         if (userId != UserHandle.USER_NULL) {
99             mPreference.setDisabledByAdmin(getEnforcedAdmin(userId));
100         }
101     }
102 
103     @Override
isChecked()104     public boolean isChecked() {
105         int userId = KEY_LOCKSCREEN_REDACT.equals(getPreferenceKey())
106                 ? UserHandle.myUserId() : mProfileUserId;
107 
108         return getAllowPrivateNotifications(userId);
109     }
110 
111     @Override
setChecked(boolean isChecked)112     public boolean setChecked(boolean isChecked) {
113         int userId = KEY_LOCKSCREEN_REDACT.equals(getPreferenceKey())
114                 ? UserHandle.myUserId() : mProfileUserId;
115 
116         Settings.Secure.putIntForUser(mContext.getContentResolver(),
117                 Settings.Secure.LOCK_SCREEN_ALLOW_PRIVATE_NOTIFICATIONS, isChecked ? 1 : 0, userId);
118         return true;
119     }
120 
121     @Override
getAvailabilityStatus()122     public int getAvailabilityStatus() {
123         // hide work profile setting if no work profile
124         if (KEY_LOCKSCREEN_WORK_PROFILE_REDACT.equals(getPreferenceKey())
125                 && mProfileUserId == UserHandle.myUserId()) {
126             return CONDITIONALLY_UNAVAILABLE;
127         }
128 
129         int userId = KEY_LOCKSCREEN_REDACT.equals(getPreferenceKey())
130                 ? UserHandle.myUserId() : mProfileUserId;
131 
132         // hide if lockscreen isn't secure for this user
133         final LockPatternUtils utils = FeatureFactory.getFeatureFactory()
134                 .getSecurityFeatureProvider()
135                 .getLockPatternUtils(mContext);
136         if (!utils.isSecure(userId)) {
137             return CONDITIONALLY_UNAVAILABLE;
138         }
139 
140         // all notifs hidden? disabled
141         if (!getLockscreenNotificationsEnabled(userId)) {
142             return DISABLED_DEPENDENT_SETTING;
143         }
144 
145         // specifically the work profile setting requires the work profile to be unlocked
146         if (KEY_LOCKSCREEN_WORK_PROFILE_REDACT.equals(getPreferenceKey())) {
147             if (mKm.isDeviceLocked(mProfileUserId)) {
148                 return DISABLED_DEPENDENT_SETTING;
149             }
150         }
151 
152         return AVAILABLE;
153     }
154 
155     @Override
getSliceHighlightMenuRes()156     public int getSliceHighlightMenuRes() {
157         return R.string.menu_key_notifications;
158     }
159 
160     @Override
onStart()161     public void onStart() {
162         mContext.getContentResolver().registerContentObserver(
163                 Settings.Secure.getUriFor(Settings.Secure.LOCK_SCREEN_SHOW_NOTIFICATIONS),
164                 false /* notifyForDescendants */, mContentObserver);
165     }
166 
167     @Override
onStop()168     public void onStop() {
169         mContext.getContentResolver().unregisterContentObserver(mContentObserver);
170     }
171 
getEnforcedAdmin(int userId)172     private RestrictedLockUtils.EnforcedAdmin getEnforcedAdmin(int userId) {
173         RestrictedLockUtils.EnforcedAdmin admin =
174                 RestrictedLockUtilsInternal.checkIfKeyguardFeaturesDisabled(
175                         mContext, KEYGUARD_DISABLE_SECURE_NOTIFICATIONS, userId);
176         if (admin != null) {
177             return admin;
178         }
179         admin = RestrictedLockUtilsInternal.checkIfKeyguardFeaturesDisabled(
180                 mContext, KEYGUARD_DISABLE_UNREDACTED_NOTIFICATIONS, userId);
181         return admin;
182     }
183 
getAllowPrivateNotifications(int userId)184     private boolean getAllowPrivateNotifications(int userId) {
185         return Settings.Secure.getIntForUser(mContext.getContentResolver(),
186                 LOCK_SCREEN_ALLOW_PRIVATE_NOTIFICATIONS, 1, userId) != 0
187                 && getEnforcedAdmin(userId) == null;
188     }
189 
getLockscreenNotificationsEnabled(int userId)190     private boolean getLockscreenNotificationsEnabled(int userId) {
191         return Settings.Secure.getIntForUser(mContext.getContentResolver(),
192                 Settings.Secure.LOCK_SCREEN_SHOW_NOTIFICATIONS, 1, userId) != 0;
193     }
194 }
195