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 
17 package com.android.voicemail;
18 
19 import android.Manifest.permission;
20 import android.content.Context;
21 import android.content.pm.PackageManager;
22 import android.support.annotation.NonNull;
23 import java.util.ArrayList;
24 import java.util.List;
25 
26 /**
27  * Handles permission checking for the voicemail module. Currently "phone" and "sms" permissions are
28  * required.
29  */
30 public class VoicemailPermissionHelper {
31 
32   /** *_VOICEMAIL permissions are auto-granted by being the default dialer. */
33   private static final String[] VOICEMAIL_PERMISSIONS = {
34     permission.ADD_VOICEMAIL,
35     permission.WRITE_VOICEMAIL,
36     permission.READ_VOICEMAIL,
37     permission.READ_PHONE_STATE,
38     permission.SEND_SMS
39   };
40 
41   /**
42    * Returns {@code true} if the app has all permissions required for the voicemail module to
43    * operate.
44    */
hasPermissions(Context context)45   public static boolean hasPermissions(Context context) {
46     return getMissingPermissions(context).isEmpty();
47   }
48 
49   /** Returns a list of permission that is missing for the voicemail module to operate. */
50   @NonNull
getMissingPermissions(Context context)51   public static List<String> getMissingPermissions(Context context) {
52     List<String> result = new ArrayList<>();
53     for (String permission : VOICEMAIL_PERMISSIONS) {
54       if (context.checkSelfPermission(permission) != PackageManager.PERMISSION_GRANTED) {
55         result.add(permission);
56       }
57     }
58     return result;
59   }
60 }
61