1/*
2 * Copyright (C) 2014 Dominik Schürmann <dominik@dominikschuermann.de>
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
17package org.openintents.openpgp.util;
18
19import android.content.ComponentName;
20import android.content.Context;
21import android.content.Intent;
22import android.content.ServiceConnection;
23import android.os.IBinder;
24
25import org.openintents.openpgp.IOpenPgpService;
26
27public class OpenPgpServiceConnection {
28
29 // callback interface
30 public interface OnBound {
31 public void onBound(IOpenPgpService service);
32
33 public void onError(Exception e);
34 }
35
36 private Context mApplicationContext;
37
38 private IOpenPgpService mService;
39 private String mProviderPackageName;
40
41 private OnBound mOnBoundListener;
42
43 /**
44 * Create new connection
45 *
46 * @param context
47 * @param providerPackageName specify package name of OpenPGP provider,
48 * e.g., "org.sufficientlysecure.keychain"
49 */
50 public OpenPgpServiceConnection(Context context, String providerPackageName) {
51 this.mApplicationContext = context.getApplicationContext();
52 this.mProviderPackageName = providerPackageName;
53 }
54
55 /**
56 * Create new connection with callback
57 *
58 * @param context
59 * @param providerPackageName specify package name of OpenPGP provider,
60 * e.g., "org.sufficientlysecure.keychain"
61 * @param onBoundListener callback, executed when connection to service has been established
62 */
63 public OpenPgpServiceConnection(Context context, String providerPackageName,
64 OnBound onBoundListener) {
65 this(context, providerPackageName);
66 this.mOnBoundListener = onBoundListener;
67 }
68
69 public IOpenPgpService getService() {
70 return mService;
71 }
72
73 public boolean isBound() {
74 return (mService != null);
75 }
76
77 private ServiceConnection mServiceConnection = new ServiceConnection() {
78 public void onServiceConnected(ComponentName name, IBinder service) {
79 mService = IOpenPgpService.Stub.asInterface(service);
80 if (mOnBoundListener != null) {
81 mOnBoundListener.onBound(mService);
82 }
83 }
84
85 public void onServiceDisconnected(ComponentName name) {
86 mService = null;
87 }
88 };
89
90 /**
91 * If not already bound, bind to service!
92 *
93 * @return
94 */
95 public void bindToService() {
96 // if not already bound...
97 if (mService == null) {
98 try {
99 Intent serviceIntent = new Intent(OpenPgpApi.SERVICE_INTENT);
100 // NOTE: setPackage is very important to restrict the intent to this provider only!
101 serviceIntent.setPackage(mProviderPackageName);
102 boolean connect = mApplicationContext.bindService(serviceIntent, mServiceConnection,
103 Context.BIND_AUTO_CREATE);
104 if (!connect) {
105 throw new Exception("bindService() returned false!");
106 }
107 } catch (Exception e) {
108 if (mOnBoundListener != null) {
109 mOnBoundListener.onError(e);
110 }
111 }
112 } else {
113 // already bound, but also inform client about it with callback
114 if (mOnBoundListener != null) {
115 mOnBoundListener.onBound(mService);
116 }
117 }
118 }
119
120 public void unbindFromService() {
121 mApplicationContext.unbindService(mServiceConnection);
122 }
123
124}