1 /*
2  * Copyright (C) 2015 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 package com.android.settings.applications.appinfo;
17 
18 import android.app.AppOpsManager;
19 import android.app.settings.SettingsEnums;
20 import android.content.Context;
21 import android.content.Intent;
22 import android.content.pm.PackageManager;
23 import android.content.pm.ResolveInfo;
24 import android.os.Bundle;
25 import android.provider.Settings;
26 
27 import androidx.appcompat.app.AlertDialog;
28 import androidx.preference.Preference;
29 import androidx.preference.Preference.OnPreferenceChangeListener;
30 import androidx.preference.Preference.OnPreferenceClickListener;
31 import androidx.preference.SwitchPreference;
32 
33 import com.android.settings.R;
34 import com.android.settings.applications.AppInfoWithHeader;
35 import com.android.settings.applications.AppStateAppOpsBridge.PermissionState;
36 import com.android.settings.applications.AppStateWriteSettingsBridge;
37 import com.android.settings.applications.AppStateWriteSettingsBridge.WriteSettingsState;
38 import com.android.settings.overlay.FeatureFactory;
39 import com.android.settingslib.applications.ApplicationsState.AppEntry;
40 
41 public class WriteSettingsDetails extends AppInfoWithHeader implements OnPreferenceChangeListener,
42         OnPreferenceClickListener {
43 
44     private static final String KEY_APP_OPS_PREFERENCE_SCREEN = "app_ops_preference_screen";
45     private static final String KEY_APP_OPS_SETTINGS_SWITCH = "app_ops_settings_switch";
46     private static final String LOG_TAG = "WriteSettingsDetails";
47 
48     private static final int [] APP_OPS_OP_CODE = {
49             AppOpsManager.OP_WRITE_SETTINGS
50     };
51 
52     // Use a bridge to get the overlay details but don't initialize it to connect with all state.
53     // TODO: Break out this functionality into its own class.
54     private AppStateWriteSettingsBridge mAppBridge;
55     private AppOpsManager mAppOpsManager;
56     private SwitchPreference mSwitchPref;
57     private Intent mSettingsIntent;
58     private WriteSettingsState mWriteSettingsState;
59 
60     @Override
onCreate(Bundle savedInstanceState)61     public void onCreate(Bundle savedInstanceState) {
62         super.onCreate(savedInstanceState);
63 
64         Context context = getActivity();
65         mAppBridge = new AppStateWriteSettingsBridge(context, mState, null);
66         mAppOpsManager = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE);
67 
68         addPreferencesFromResource(R.xml.write_system_settings_permissions_details);
69         mSwitchPref = (SwitchPreference) findPreference(KEY_APP_OPS_SETTINGS_SWITCH);
70 
71         mSwitchPref.setOnPreferenceChangeListener(this);
72 
73         mSettingsIntent = new Intent(Intent.ACTION_MAIN)
74                 .addCategory(Settings.INTENT_CATEGORY_USAGE_ACCESS_CONFIG)
75                 .setPackage(mPackageName);
76     }
77 
78     @Override
onPreferenceClick(Preference preference)79     public boolean onPreferenceClick(Preference preference) {
80         return false;
81     }
82 
83     @Override
onPreferenceChange(Preference preference, Object newValue)84     public boolean onPreferenceChange(Preference preference, Object newValue) {
85         if (preference == mSwitchPref) {
86             if (mWriteSettingsState != null && (Boolean) newValue != mWriteSettingsState
87                     .isPermissible()) {
88                 setCanWriteSettings(!mWriteSettingsState.isPermissible());
89                 refreshUi();
90             }
91             return true;
92         }
93         return false;
94     }
95 
setCanWriteSettings(boolean newState)96     private void setCanWriteSettings(boolean newState) {
97         logSpecialPermissionChange(newState, mPackageName);
98         mAppOpsManager.setMode(AppOpsManager.OP_WRITE_SETTINGS,
99                 mPackageInfo.applicationInfo.uid, mPackageName, newState
100                 ? AppOpsManager.MODE_ALLOWED : AppOpsManager.MODE_ERRORED);
101     }
102 
logSpecialPermissionChange(boolean newState, String packageName)103     void logSpecialPermissionChange(boolean newState, String packageName) {
104         int logCategory = newState ? SettingsEnums.APP_SPECIAL_PERMISSION_SETTINGS_CHANGE_ALLOW
105                 : SettingsEnums.APP_SPECIAL_PERMISSION_SETTINGS_CHANGE_DENY;
106         FeatureFactory.getFactory(getContext()).getMetricsFeatureProvider().action(getContext(),
107                 logCategory, packageName);
108     }
109 
canWriteSettings(String pkgName)110     private boolean canWriteSettings(String pkgName) {
111         int result = mAppOpsManager.noteOpNoThrow(AppOpsManager.OP_WRITE_SETTINGS,
112                 mPackageInfo.applicationInfo.uid, pkgName);
113         if (result == AppOpsManager.MODE_ALLOWED) {
114             return true;
115         }
116 
117         return false;
118     }
119 
120     @Override
refreshUi()121     protected boolean refreshUi() {
122         mWriteSettingsState = mAppBridge.getWriteSettingsInfo(mPackageName,
123                 mPackageInfo.applicationInfo.uid);
124 
125         boolean canWrite = mWriteSettingsState.isPermissible();
126         mSwitchPref.setChecked(canWrite);
127         // you can't ask a user for a permission you didn't even declare!
128         mSwitchPref.setEnabled(mWriteSettingsState.permissionDeclared);
129 
130         ResolveInfo resolveInfo = mPm.resolveActivityAsUser(mSettingsIntent,
131                 PackageManager.GET_META_DATA, mUserId);
132         return true;
133     }
134 
135     @Override
createDialog(int id, int errorCode)136     protected AlertDialog createDialog(int id, int errorCode) {
137         return null;
138     }
139 
140     @Override
getMetricsCategory()141     public int getMetricsCategory() {
142         return SettingsEnums.SYSTEM_ALERT_WINDOW_APPS;
143     }
144 
getSummary(Context context, AppEntry entry)145     public static CharSequence getSummary(Context context, AppEntry entry) {
146         WriteSettingsState state;
147         if (entry.extraInfo instanceof WriteSettingsState) {
148             state = (WriteSettingsState) entry.extraInfo;
149         } else if (entry.extraInfo instanceof PermissionState) {
150             state = new WriteSettingsState((PermissionState) entry.extraInfo);
151         } else {
152             state = new AppStateWriteSettingsBridge(context, null, null).getWriteSettingsInfo(
153                     entry.info.packageName, entry.info.uid);
154         }
155 
156         return getSummary(context, state);
157     }
158 
getSummary(Context context, WriteSettingsState writeSettingsState)159     public static CharSequence getSummary(Context context, WriteSettingsState writeSettingsState) {
160         return context.getString(writeSettingsState.isPermissible()
161                 ? R.string.app_permission_summary_allowed
162                 : R.string.app_permission_summary_not_allowed);
163     }
164 }
165