| /* AbstractCallbackHandler.java -- |
| Copyright (C) 2005, 2006 Free Software Foundation, Inc. |
| |
| This file is a part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or (at |
| your option) any later version. |
| |
| GNU Classpath is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 |
| USA |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package gnu.javax.security.auth.callback; |
| |
| import gnu.java.security.Engine; |
| |
| import java.io.IOException; |
| import java.lang.reflect.InvocationTargetException; |
| import java.util.PropertyResourceBundle; |
| import java.util.ResourceBundle; |
| |
| import java.security.NoSuchAlgorithmException; |
| import java.security.NoSuchProviderException; |
| import java.security.Provider; |
| import java.security.Security; |
| |
| import javax.security.auth.callback.Callback; |
| import javax.security.auth.callback.CallbackHandler; |
| import javax.security.auth.callback.ChoiceCallback; |
| import javax.security.auth.callback.ConfirmationCallback; |
| import javax.security.auth.callback.LanguageCallback; |
| import javax.security.auth.callback.NameCallback; |
| import javax.security.auth.callback.PasswordCallback; |
| import javax.security.auth.callback.TextInputCallback; |
| import javax.security.auth.callback.TextOutputCallback; |
| import javax.security.auth.callback.UnsupportedCallbackException; |
| |
| public abstract class AbstractCallbackHandler implements CallbackHandler |
| { |
| |
| // Fields. |
| // ------------------------------------------------------------------------- |
| |
| private static final String SERVICE = "CallbackHandler"; |
| |
| protected final ResourceBundle messages; |
| |
| private final String name; |
| |
| // Constructors. |
| // ------------------------------------------------------------------------- |
| |
| protected AbstractCallbackHandler (final String name) |
| { |
| super(); |
| messages = PropertyResourceBundle.getBundle("gnu/javax/security/auth/callback/MessagesBundle"); |
| this.name = name; |
| } |
| |
| // Class methods. |
| // ------------------------------------------------------------------------- |
| |
| public static CallbackHandler getInstance(String type) |
| throws NoSuchAlgorithmException |
| { |
| Provider[] p = Security.getProviders(); |
| for (int i = 0; i < p.length; i++) |
| { |
| try |
| { |
| return getInstance(type, p[i]); |
| } |
| catch (NoSuchAlgorithmException ignored) |
| { |
| } |
| } |
| throw new NoSuchAlgorithmException(type); |
| } |
| |
| public static CallbackHandler getInstance(String type, String provider) |
| throws NoSuchAlgorithmException, NoSuchProviderException |
| { |
| Provider p = Security.getProvider(provider); |
| if (p == null) |
| { |
| throw new NoSuchProviderException(provider); |
| } |
| return getInstance(type, p); |
| } |
| |
| public static CallbackHandler getInstance(String type, Provider provider) |
| throws NoSuchAlgorithmException |
| { |
| try |
| { |
| return (CallbackHandler) Engine.getInstance(SERVICE, type, provider); |
| } |
| catch (InvocationTargetException ite) |
| { |
| Throwable cause = ite.getCause(); |
| if (cause instanceof NoSuchAlgorithmException) |
| throw (NoSuchAlgorithmException) cause; |
| NoSuchAlgorithmException nsae = new NoSuchAlgorithmException(type); |
| if (cause != null) |
| nsae.initCause (cause); |
| throw nsae; |
| } |
| catch (ClassCastException cce) |
| { |
| NoSuchAlgorithmException nsae = new NoSuchAlgorithmException(type); |
| nsae.initCause (cce); |
| throw nsae; |
| } |
| } |
| |
| // Instance methods. |
| // ------------------------------------------------------------------------- |
| |
| public void handle(Callback[] callbacks) |
| throws IOException, UnsupportedCallbackException |
| { |
| if (callbacks == null) |
| throw new NullPointerException(); |
| for (int i = 0; i < callbacks.length; i++) |
| { |
| if (callbacks[i] == null) |
| continue; |
| if (callbacks[i] instanceof ChoiceCallback) |
| handleChoice((ChoiceCallback) callbacks[i]); |
| else if (callbacks[i] instanceof ConfirmationCallback) |
| handleConfirmation((ConfirmationCallback) callbacks[i]); |
| else if (callbacks[i] instanceof LanguageCallback) |
| handleLanguage((LanguageCallback) callbacks[i]); |
| else if (callbacks[i] instanceof NameCallback) |
| handleName((NameCallback) callbacks[i]); |
| else if (callbacks[i] instanceof PasswordCallback) |
| handlePassword((PasswordCallback) callbacks[i]); |
| else if (callbacks[i] instanceof TextInputCallback) |
| handleTextInput((TextInputCallback) callbacks[i]); |
| else if (callbacks[i] instanceof TextOutputCallback) |
| handleTextOutput((TextOutputCallback) callbacks[i]); |
| else |
| handleOther(callbacks[i]); |
| } |
| } |
| |
| public final String getName () |
| { |
| return name; |
| } |
| |
| // Abstract methods. |
| // ------------------------------------------------------------------------- |
| |
| /** |
| * Handles a {@link ChoiceCallback}. |
| * |
| * @param callback The choice callback. |
| * @throws IOException If an I/O error occurs. |
| */ |
| protected abstract void handleChoice(ChoiceCallback callback) |
| throws IOException; |
| |
| /** |
| * Handles a {@link ConfirmationCallback}. |
| * |
| * @param callback The confirmation callback. |
| * @throws IOException If an I/O error occurs. |
| */ |
| protected abstract void handleConfirmation(ConfirmationCallback callback) |
| throws IOException; |
| |
| /** |
| * Handles a {@link LanguageCallback}. |
| * |
| * @param callback The language callback. |
| * @throws IOException If an I/O error occurs. |
| */ |
| protected abstract void handleLanguage(LanguageCallback callback) |
| throws IOException; |
| |
| /** |
| * Handles a {@link NameCallback}. |
| * |
| * @param callback The name callback. |
| * @throws IOException If an I/O error occurs. |
| */ |
| protected abstract void handleName(NameCallback callback) |
| throws IOException; |
| |
| /** |
| * Handles a {@link PasswordCallback}. |
| * |
| * @param callback The password callback. |
| * @throws IOException If an I/O error occurs. |
| */ |
| protected abstract void handlePassword(PasswordCallback callback) |
| throws IOException; |
| |
| /** |
| * Handles a {@link TextInputCallback}. |
| * |
| * @param callback The text input callback. |
| * @throws IOException If an I/O error occurs. |
| */ |
| protected abstract void handleTextInput(TextInputCallback callback) |
| throws IOException; |
| |
| /** |
| * Handles a {@link TextOutputCallback}. |
| * |
| * @param callback The text output callback. |
| * @throws IOException If an I/O error occurs. |
| */ |
| protected abstract void handleTextOutput(TextOutputCallback callback) |
| throws IOException; |
| |
| /** |
| * Handles an unknown callback. The default implementation simply throws |
| * an {@link UnsupportedCallbackException}. |
| * |
| * @param callback The callback to handle. |
| * @throws IOException If an I/O error occurs. |
| * @throws UnsupportedCallbackException If the specified callback is not |
| * supported. |
| */ |
| protected void handleOther(Callback callback) |
| throws IOException, UnsupportedCallbackException |
| { |
| throw new UnsupportedCallbackException(callback); |
| } |
| } |