1 /*
   2  * Copyright 2009 Sun Microsystems, Inc.  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.  Sun designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  22  * CA 95054 USA or visit www.sun.com if you need additional information or
  23  * have any 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 getSupported(HttpCallerInfo hci)
  38                 throws Exception {
  39 
  40         // These lines are equivalent to
  41         //      return new NegotiatorImpl(hci);
  42         // The current implementation will make sure NegotiatorImpl is not
  43         // directly referenced when compiling, thus smooth the way of building
  44         // the J2SE platform where HttpURLConnection is a bootstrap class.
  45         //
  46             // Makes NegotiatorImpl, and the security classes it references, a
  47         // runtime dependency rather than a static one.
  48 
  49         Class clazz;
  50         Constructor c;
  51         try {
  52             clazz = Class.forName("sun.net.www.protocol.http.spnego.NegotiatorImpl", true, null);
  53             c = clazz.getConstructor(HttpCallerInfo.class);
  54         } catch (ClassNotFoundException cnfe) {
  55             finest(cnfe);
  56             throw cnfe;
  57         } catch (ReflectiveOperationException roe) {
  58             // if the class is there then something seriously wrong if
  59             // the constructor is not.
  60             throw new AssertionError(roe);
  61         }
  62 
  63         try {
  64             return (Negotiator) (c.newInstance(hci));
  65         } catch (ReflectiveOperationException roe) {
  66             finest(roe);
  67             Throwable t = roe.getCause();
  68             if (t != null && t instanceof Exception)
  69             finest((Exception)t);
  70             throw roe;
  71         }
  72     }
  73 
  74     public abstract byte[] firstToken() throws IOException;
  75 
  76     public abstract byte[] nextToken(byte[] in) throws IOException;
  77 
  78     private static void finest(Exception e) {
  79             PlatformLogger logger = HttpURLConnection.getHttpLogger();
  80             logger.finest("NegotiateAuthentication: " + e);
  81     }
  82 }
  83