1 /*
2  * Copyright (C) 2011 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 
18 package com.android.emailcommon.utility;
19 
20 import android.app.Activity;
21 import android.content.Intent;
22 import android.net.Uri;
23 import android.os.Bundle;
24 import android.security.KeyChain;
25 import android.security.KeyChainAliasCallback;
26 
27 /**
28  * A headless Activity which simply calls into the framework {@link KeyChain} service to select
29  * a certificate to use for establishing secure connections in the Email app.
30  */
31 public class CertificateRequestor extends Activity implements KeyChainAliasCallback {
32     public static final String EXTRA_HOST = "CertificateRequestor.host";
33     public static final String EXTRA_PORT = "CertificateRequestor.port";
34 
35     public static final String RESULT_ALIAS = "CertificateRequestor.alias";
36 
37     public static final Uri CERTIFICATE_REQUEST_URI =
38             Uri.parse("eas://com.android.emailcommon/certrequest");
39 
40     @Override
onCreate(Bundle savedInstanceState)41     protected void onCreate(Bundle savedInstanceState) {
42         super.onCreate(savedInstanceState);
43 
44         Intent i = getIntent();
45         String host = i.getStringExtra(EXTRA_HOST);
46         int port = i.getIntExtra(EXTRA_PORT, -1);
47 
48         if (savedInstanceState == null) {
49             KeyChain.choosePrivateKeyAlias(
50                     this, this,
51                     null /* keytypes */, null /* issuers */,
52                     host, port,
53                     null /* alias */);
54         }
55     }
56 
57     /**
58      * Callback for the certificate request. Does not happen on the UI thread.
59      */
60     @Override
alias(String alias)61     public void alias(String alias) {
62         if (alias == null) {
63             setResult(RESULT_CANCELED);
64         } else {
65             Intent data = new Intent();
66             data.putExtra(RESULT_ALIAS, alias);
67             setResult(RESULT_OK, data);
68         }
69         finish();
70     }
71 }
72