1 /*
2  * Copyright (C) 2020 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.systemui.car.toast;
18 
19 import android.app.ActivityManager;
20 import android.app.ITransientNotificationCallback;
21 import android.content.Context;
22 import android.content.pm.ApplicationInfo;
23 import android.content.pm.PackageManager;
24 import android.content.res.Resources;
25 import android.os.IBinder;
26 import android.util.Log;
27 
28 import androidx.annotation.Nullable;
29 
30 import com.android.systemui.R;
31 import com.android.systemui.dagger.SysUISingleton;
32 import com.android.systemui.dagger.qualifiers.Main;
33 import com.android.systemui.statusbar.CommandQueue;
34 import com.android.systemui.toast.ToastFactory;
35 import com.android.systemui.toast.ToastLogger;
36 import com.android.systemui.toast.ToastUI;
37 
38 import java.util.Arrays;
39 import java.util.HashSet;
40 import java.util.Set;
41 
42 import javax.inject.Inject;
43 
44 /**
45  * Controls display of text toasts in AAOS.
46  */
47 @SysUISingleton
48 public class CarToastUI extends ToastUI {
49     private static final boolean DEBUG = false;
50     private static final String TAG = "CarToastUI";
51 
52     private final PackageManager mPackageManager;
53     private final Set<String> mPackageNameAllowList;
54 
55     @Inject
CarToastUI(Context context, @Main Resources resources, CommandQueue commandQueue, ToastFactory toastFactory, ToastLogger toastLogger, PackageManager packageManager)56     public CarToastUI(Context context, @Main Resources resources, CommandQueue commandQueue,
57             ToastFactory toastFactory, ToastLogger toastLogger, PackageManager packageManager) {
58         super(context, commandQueue, toastFactory, toastLogger);
59         mPackageManager = packageManager;
60 
61         String[] allowList = resources.getStringArray(
62                 R.array.config_restrictedToastsPackageNameAllowList);
63         mPackageNameAllowList = new HashSet<>(Arrays.asList(allowList));
64     }
65 
66     @Override
showToast(int uid, String packageName, IBinder token, CharSequence text, IBinder windowToken, int duration, @Nullable ITransientNotificationCallback callback)67     public void showToast(int uid, String packageName, IBinder token, CharSequence text,
68             IBinder windowToken, int duration, @Nullable ITransientNotificationCallback callback) {
69         if (!isAllowListed(packageName) && !isSystemPrivilegedOrPlatformKey(packageName)) {
70             if (DEBUG) {
71                 Log.w(TAG, packageName
72                         + " cannot show a Toast since it is not allow listed and it isn't "
73                         + "privileged.");
74             }
75             return;
76         }
77         if (DEBUG) {
78             Log.d(TAG,
79                     packageName
80                             + " is a system privileged app or has been signed with platform key.");
81         }
82 
83         super.showToast(uid, packageName, token, text, windowToken, duration, callback);
84     }
85 
isAllowListed(String packageName)86     private boolean isAllowListed(String packageName) {
87         return mPackageNameAllowList.contains(packageName);
88     }
89 
isSystemPrivilegedOrPlatformKey(String packageName)90     private boolean isSystemPrivilegedOrPlatformKey(String packageName) {
91         ApplicationInfo applicationInfo = getApplicationInfo(packageName);
92         if (applicationInfo == null) return false;
93 
94         return (applicationInfo.isSignedWithPlatformKey() || (
95                 applicationInfo.isSystemApp()
96                         && applicationInfo.isPrivilegedApp()));
97     }
98 
getApplicationInfo(String packageName)99     private ApplicationInfo getApplicationInfo(String packageName) {
100         ApplicationInfo applicationInfo = null;
101         try {
102             applicationInfo = mPackageManager.getApplicationInfoAsUser(packageName, /* flags= */ 0,
103                     ActivityManager.getCurrentUser());
104         } catch (PackageManager.NameNotFoundException ex) {
105             Log.e(TAG, "package not found: " + packageName);
106         }
107         return applicationInfo;
108     }
109 }
110