1 /*
   2  * Copyright (c) 2009, 2011, 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 
  26 package sun.net.www.protocol.http;
  27 
  28 import java.io.IOException;
  29 import java.lang.reflect.Constructor;
  30 import 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  */
  36 public 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", true, null);
  52             c = clazz.getConstructor(HttpCallerInfo.class);
  53         } catch (ClassNotFoundException cnfe) {
  54             finest(cnfe);
  55             return null;
  56         } catch (ReflectiveOperationException roe) {
  57             // if the class is there then something seriously wrong if
  58             // the constructor is not.
  59             throw new AssertionError(roe);
  60         }
  61 
  62         try {
  63             return (Negotiator) (c.newInstance(hci));
  64         } catch (ReflectiveOperationException roe) {
  65             finest(roe);
  66             Throwable t = roe.getCause();
  67             if (t != null && t instanceof Exception)
  68                 finest((Exception)t);
  69             return null;
  70         }
  71     }
  72 
  73     public abstract byte[] firstToken() throws IOException;
  74 
  75     public abstract byte[] nextToken(byte[] in) throws IOException;
  76 
  77     private static void finest(Exception e) {
  78         PlatformLogger logger = HttpURLConnection.getHttpLogger();
  79         logger.finest("NegotiateAuthentication: " + e);
  80     }
  81 }
  82