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.packageinstaller.permission.utils;
18 
19 import static android.Manifest.permission.READ_EXTERNAL_STORAGE;
20 import static android.Manifest.permission.WRITE_EXTERNAL_STORAGE;
21 import static android.content.pm.PackageManager.FLAG_PERMISSION_RESTRICTION_INSTALLER_EXEMPT;
22 import static android.content.pm.PackageManager.FLAG_PERMISSION_RESTRICTION_SYSTEM_EXEMPT;
23 import static android.content.pm.PackageManager.FLAG_PERMISSION_RESTRICTION_UPGRADE_EXEMPT;
24 
25 import android.content.pm.PackageInfo;
26 import android.os.Build;
27 
28 import androidx.annotation.NonNull;
29 
30 import com.android.packageinstaller.permission.model.Permission;
31 
32 /**
33  * The behavior of soft restricted permissions is different for each permission. This class collects
34  * the policies in one place.
35  *
36  * This is the twin of {@link com.android.server.policy.SoftRestrictedPermissionPolicy}
37  */
38 public abstract class SoftRestrictedPermissionPolicy {
39     private static final int FLAGS_PERMISSION_RESTRICTION_ANY_EXEMPT =
40             FLAG_PERMISSION_RESTRICTION_SYSTEM_EXEMPT
41                     | FLAG_PERMISSION_RESTRICTION_UPGRADE_EXEMPT
42                     | FLAG_PERMISSION_RESTRICTION_INSTALLER_EXEMPT;
43 
44     /**
45      * Check if the permission should be shown in the UI.
46      *
47      * @param pkg the package the permission belongs to
48      * @param permission the permission
49      *
50      * @return {@code true} iff the permission should be shown in the UI.
51      */
shouldShow(@onNull PackageInfo pkg, @NonNull Permission permission)52     public static boolean shouldShow(@NonNull PackageInfo pkg, @NonNull Permission permission) {
53         switch (permission.getName()) {
54             case READ_EXTERNAL_STORAGE:
55             case WRITE_EXTERNAL_STORAGE: {
56                 boolean isWhiteListed =
57                         (permission.getFlags() & FLAGS_PERMISSION_RESTRICTION_ANY_EXEMPT) != 0;
58                 int targetSDK = pkg.applicationInfo.targetSdkVersion;
59 
60                 return isWhiteListed || targetSDK >= Build.VERSION_CODES.Q;
61             }
62             default:
63                 return true;
64         }
65     }
66 }
67