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.providers.contacts.util;
17 
18 import android.content.Context;
19 import android.content.Intent;
20 import android.content.pm.PackageManager;
21 import android.net.Uri;
22 import android.os.Binder;
23 import android.os.Process;
24 import android.util.Log;
25 
26 public class ContactsPermissions {
27     private static final String TAG = "ContactsPermissions";
28 
29     private static final boolean DEBUG = false; // DO NOT submit with true
30 
31     // Normally, we allow calls from self, *except* in unit tests, where we clear this flag
32     // to emulate calls from other apps.
33     public static boolean ALLOW_SELF_CALL = true;
34 
ContactsPermissions()35     private ContactsPermissions() {
36     }
37 
hasCallerOrSelfPermission(Context context, String permission)38     public static boolean hasCallerOrSelfPermission(Context context, String permission) {
39         boolean ok = false;
40 
41         if (ALLOW_SELF_CALL && Binder.getCallingPid() == Process.myPid()) {
42             ok = true; // Called by self; always allow.
43         } else {
44             ok = context.checkCallingOrSelfPermission(permission)
45                     == PackageManager.PERMISSION_GRANTED;
46         }
47         if (DEBUG) {
48             Log.d(TAG, "hasCallerOrSelfPermission: "
49                     + " perm=" + permission
50                     + " caller=" + Binder.getCallingPid()
51                     + " self=" + Process.myPid()
52                     + " ok=" + ok);
53         }
54         return ok;
55     }
56 
enforceCallingOrSelfPermission(Context context, String permission)57     public static void enforceCallingOrSelfPermission(Context context, String permission) {
58         final boolean ok = hasCallerOrSelfPermission(context, permission);
59         if (!ok) {
60             throw new SecurityException(String.format("The caller must have the %s permission.",
61                     permission));
62         }
63     }
64 
hasPackagePermission(Context context, String permission, String pkg)65     public static boolean hasPackagePermission(Context context, String permission, String pkg) {
66         boolean ok = false;
67         if (ALLOW_SELF_CALL && context.getPackageName().equals(pkg)) {
68             ok =  true; // Called by self; always allow.
69         } else {
70             ok = context.getPackageManager().checkPermission(permission, pkg)
71                     == PackageManager.PERMISSION_GRANTED;
72         }
73         if (DEBUG) {
74             Log.d(TAG, "hasCallerOrSelfPermission: "
75                     + " perm=" + permission
76                     + " pkg=" + pkg
77                     + " self=" + context.getPackageName()
78                     + " ok=" + ok);
79         }
80         return ok;
81     }
82 
hasCallerUriPermission(Context context, Uri uri, int modeFlags)83     public static boolean hasCallerUriPermission(Context context, Uri uri, int modeFlags) {
84         boolean ok = false;
85         if (ALLOW_SELF_CALL && Binder.getCallingPid() == Process.myPid()) {
86             ok =  true; // Called by self; always allow.
87         } else {
88             ok = context.checkCallingUriPermission(uri, modeFlags)
89                     == PackageManager.PERMISSION_GRANTED;
90         }
91         if (DEBUG) {
92             Log.d(TAG, "hasCallerUriPermission: "
93                     + " uri=" + uri
94                     + " caller=" + Binder.getCallingPid()
95                     + " self=" + Process.myPid()
96                     + " ok=" + ok);
97         }
98         return ok;
99     }
100 }
101