security/runtime/org.argeo.security.core/src/main/java/org/argeo/security/core/ConsoleCallbackHandler.java

   1 package org.argeo.security.core;
   2
   3 import java.io.Console;
   4 import java.io.IOException;
   5 import java.io.PrintWriter;
   6 import java.util.Locale;
   7
   8 import javax.security.auth.callback.Callback;
   9 import javax.security.auth.callback.CallbackHandler;
  10 import javax.security.auth.callback.NameCallback;
  11 import javax.security.auth.callback.PasswordCallback;
  12 import javax.security.auth.callback.TextOutputCallback;
  13 import javax.security.auth.callback.UnsupportedCallbackException;
  14
  15 import org.argeo.ArgeoException;
  16 import org.argeo.util.LocaleCallback;
  17
  18 /** Callback handler to be used with a command line UI. */
  19 public class ConsoleCallbackHandler implements CallbackHandler {
  20
  21         @Override
  22         public void handle(Callback[] callbacks) throws IOException,
  23                         UnsupportedCallbackException {
  24                 Console console = System.console();
  25                 if (console == null)
  26                         throw new ArgeoException("No console available");
  27
  28                 PrintWriter writer = console.writer();
  29                 for (int i = 0; i < callbacks.length; i++) {
  30                         if (callbacks[i] instanceof TextOutputCallback) {
  31                                 TextOutputCallback callback = (TextOutputCallback) callbacks[i];
  32                                 writer.write(callback.getMessage());
  33                         } else if (callbacks[i] instanceof NameCallback) {
  34                                 NameCallback callback = (NameCallback) callbacks[i];
  35                                 writer.write(callback.getPrompt());
  36                                 if (callback.getDefaultName() != null)
  37                                         writer.write(" (" + callback.getDefaultName() + ")");
  38                                 writer.write(" : ");
  39                                 String answer = console.readLine();
  40                                 if (callback.getDefaultName() != null
  41                                                 && answer.trim().equals(""))
  42                                         callback.setName(callback.getDefaultName());
  43                                 else
  44                                         callback.setName(answer);
  45                         } else if (callbacks[i] instanceof PasswordCallback) {
  46                                 PasswordCallback callback = (PasswordCallback) callbacks[i];
  47                                 writer.write(callback.getPrompt());
  48                                 char[] answer = console.readPassword();
  49                                 callback.setPassword(answer);
  50                         } else if (callbacks[i] instanceof LocaleCallback) {
  51                                 LocaleCallback callback = (LocaleCallback) callbacks[i];
  52                                 writer.write(callback.getPrompt());
  53                                 writer.write("\n");
  54                                 for (int j = 0; j < callback.getAvailableLocales().size(); j++) {
  55                                         Locale locale = callback.getAvailableLocales().get(j);
  56                                         writer.print(j + " : " + locale.getDisplayName() + "\n");
  57                                 }
  58                                 writer.write("(" + callback.getDefaultIndex() + ") : ");
  59                                 String answer = console.readLine();
  60                                 if (answer.trim().equals(""))
  61                                         callback.setSelectedIndex(callback.getDefaultIndex());
  62                                 else
  63                                         callback.setSelectedIndex(new Integer(answer.trim()));
  64                         }
  65                 }
  66         }
  67
  68 }