JaasTxtCalbackHandler


1   package org.jacorb.demo.sas;
2   
3   import javax.security.auth.callback.Callback  ;
4   import javax.security.auth.callback.CallbackHandler  ;
5   import javax.security.auth.callback.NameCallback  ;
6   import javax.security.auth.callback.PasswordCallback  ;
7   import javax.security.auth.callback.TextOutputCallback  ;
8   import javax.security.auth.callback.UnsupportedCallbackException  ;
9   
10  public class JaasTxtCalbackHandler implements CallbackHandler   {
11  
12      private String   myUsername = "";
13      private char[] myPassword = null;
14  
15      /**
16       * <p>Creates a callback handler that prompts and reads from the
17       * command line for answers to authentication questions.
18       * This can be used by JAAS applications to instantiate a
19       * CallbackHandler.
20  
21      */
22      public JaasTxtCalbackHandler() {
23      }
24  
25      public void setMyUsername(String   username) {
26          myUsername = username;
27      }
28  
29      public void setMyPassword(char[] password) {
30          myPassword = password;
31      }
32  
33      /**
34       * Handles the specified set of callbacks.
35       *
36       * @param callbacks the callbacks to handle
37       * @throws IOException if an input or output error occurs.
38       * @throws UnsupportedCallbackException if the callback is not an
39       * instance of NameCallback or PasswordCallback
40       */
41      public void handle(Callback  [] callbacks) throws UnsupportedCallbackException   {
42  
43          for (int i = 0; i < callbacks.length; i++) {
44              if (callbacks[i] instanceof TextOutputCallback  ) {
45                  TextOutputCallback   tc = (TextOutputCallback  ) callbacks[i];
46  
47                  String   text;
48                  switch (tc.getMessageType()) {
49                      case TextOutputCallback.INFORMATION :
50                      text = "";
51                      break;
52                      case TextOutputCallback.WARNING :
53                      text = "Warning: ";
54                      break;
55                      case TextOutputCallback.ERROR :
56                      text = "Error: ";
57                      break;
58                      default :
59                      throw new UnsupportedCallbackException  (
60                          callbacks[i],
61                          "Unrecognized message type");
62                  }
63  
64                  String   message = tc.getMessage();
65                  if (message != null) {
66                      text += message;
67                  }
68                  if (text != null) {
69                      System.err.println(text);
70                  }
71  
72              } else if (callbacks[i] instanceof NameCallback  ) {
73                  NameCallback   nc = (NameCallback  ) callbacks[i];
74                  nc.setName(myUsername);
75  
76              } else if (callbacks[i] instanceof PasswordCallback  ) {
77                  PasswordCallback   pc = (PasswordCallback  ) callbacks[i];
78                  pc.setPassword(myPassword);
79  
80              } else {
81                  throw new UnsupportedCallbackException  (callbacks[i], "Unrecognized Callback");
82              }
83          }
84      }
85  
86  }
87
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