1/*
2 * Copyright (c) 2009, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26package sun.net.www.protocol.http;
27
28import java.io.IOException;
29import java.lang.reflect.Constructor;
30import sun.util.logging.PlatformLogger;
31
32/**
33 * This abstract class is a bridge to connect NegotiteAuthentication and
34 * NegotiatorImpl, so that JAAS and JGSS calls can be made
35 */
36public abstract class Negotiator {
37    static Negotiator getNegotiator(HttpCallerInfo hci) {
38
39        // These lines are equivalent to
40        // return new NegotiatorImpl(hci);
41        // The current implementation will make sure NegotiatorImpl is not
42        // directly referenced when compiling, thus smooth the way of building
43        // the J2SE platform where HttpURLConnection is a bootstrap class.
44        //
45        // Makes NegotiatorImpl, and the security classes it references, a
46        // runtime dependency rather than a static one.
47
48        Class<?> clazz;
49        Constructor<?> c;
50        try {
51            clazz = Class.forName("sun.net.www.protocol.http.spnego.NegotiatorImpl",
52                                  true,
53                                  ClassLoader.getPlatformClassLoader());
54            c = clazz.getConstructor(HttpCallerInfo.class);
55        } catch (ClassNotFoundException cnfe) {
56            finest(cnfe);
57            return null;
58        } catch (ReflectiveOperationException roe) {
59            // if the class is there then something seriously wrong if
60            // the constructor is not.
61            throw new AssertionError(roe);
62        }
63
64        try {
65            return (Negotiator) (c.newInstance(hci));
66        } catch (ReflectiveOperationException roe) {
67            finest(roe);
68            Throwable t = roe.getCause();
69            if (t != null && t instanceof Exception)
70                finest((Exception)t);
71            return null;
72        }
73    }
74
75    public abstract byte[] firstToken() throws IOException;
76
77    public abstract byte[] nextToken(byte[] in) throws IOException;
78
79    private static void finest(Exception e) {
80        PlatformLogger logger = HttpURLConnection.getHttpLogger();
81        if (logger.isLoggable(PlatformLogger.Level.FINEST)) {
82            logger.finest("NegotiateAuthentication: " + e);
83        }
84    }
85}
86
87