SSLUtils.java revision 724c3a81cd3649b48ab47c6e49cb42f73f20c815 
1/*
2 * Copyright (C) 2010 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
17package com.android.emailcommon.utility;
18
19import android.net.SSLCertificateSocketFactory;
20
21import javax.net.ssl.SSLSocketFactory;
22
23public class SSLUtils {
24    private static SSLSocketFactory sInsecureFactory;
25    private static SSLSocketFactory sSecureFactory;
26
27    /**
28     * Returns a {@link SSLSocketFactory}.  Optionally bypass all SSL certificate checks.
29     *
30     * @param insecure if true, bypass all SSL certificate checks
31     */
32    public synchronized static final SSLSocketFactory getSSLSocketFactory(boolean insecure) {
33        if (insecure) {
34            if (sInsecureFactory == null) {
35                sInsecureFactory = SSLCertificateSocketFactory.getInsecure(0, null);
36            }
37            return sInsecureFactory;
38        } else {
39            if (sSecureFactory == null) {
40                sSecureFactory = SSLCertificateSocketFactory.getDefault(0, null);
41            }
42            return sSecureFactory;
43        }
44    }
45
46    /**
47     * Escapes the contents a string to be used as a safe scheme name in the URI according to
48     * http://tools.ietf.org/html/rfc3986#section-3.1
49     *
50     * This does not ensure that the first character is a letter (which is required by the RFC).
51     */
52    public static String escapeForSchemeName(String s) {
53        // According to the RFC, scheme names are case-insensitive.
54        s = s.toLowerCase();
55
56        StringBuilder sb = new StringBuilder();
57        for (int i = 0; i < s.length(); i++) {
58            char c = s.charAt(i);
59            if (Character.isLetter(c) || Character.isDigit(c)
60                    || ('-' == c) || ('.' == c)) {
61                // Safe - use as is.
62                sb.append(c);
63            } else if ('+' == c) {
64                // + is used as our escape character, so double it up.
65                sb.append("++");
66            } else {
67                // Unsafe - escape.
68                sb.append('+').append((int) c);
69            }
70        }
71        return sb.toString();
72    }
73}
74