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1 files changed, 155 insertions, 0 deletions

diff --git a/libjava/classpath/javax/security/auth/callback/CallbackHandler.java b/libjava/classpath/javax/security/auth/callback/CallbackHandler.java
new file mode 100644
index 000000000..8d22943ca
--- /dev/null
+++ b/libjava/classpath/javax/security/auth/callback/CallbackHandler.java
@@ -0,0 +1,155 @@
+/* CallbackHandler.java -- base interface for callback handlers.
+   Copyright (C) 2003, Free Software Foundation, Inc.
+
+This file is 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, 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; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, 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 javax.security.auth.callback;
+
+import java.io.IOException;
+
+/**
+ * <p>An application implements a <code>CallbackHandler</code> and passes it to
+ * underlying security services so that they may interact with the application
+ * to retrieve specific authentication data, such as usernames and passwords, or
+ * to display certain information, such as error and warning messages.</p>
+ *
+ * <p><code>CallbackHandler</code>s are implemented in an application-dependent
+ * fashion. For example, implementations for an application with a graphical
+ * user interface (GUI) may pop up windows to prompt for requested information
+ * or to display error messages. An implementation may also choose to obtain
+ * requested information from an alternate source without asking the end user.</p>
+ *
+ * <p>Underlying security services make requests for different types of
+ * information by passing individual Callbacks to the <code>CallbackHandler</code>.
+ * The <code>CallbackHandler</code> implementation decides how to retrieve and
+ * display information depending on the {@link Callback}s passed to it. For
+ * example, if the underlying service needs a username and password to
+ * authenticate a user, it uses a {@link NameCallback} and
+ * {@link PasswordCallback}. The <code>CallbackHandler</code> can then choose
+ * to prompt for a username and password serially, or to prompt for both in a
+ * single window.</p>
+ *
+ * <p>A default <code>CallbackHandler</code> class implementation may be
+ * specified in the <code>auth.login.defaultCallbackHandler</code> security
+ * property. The security property can be set in the Java security properties
+ * file located in the file named
+ * <code>&lt;JAVA_HOME>/lib/security/java.security</code>, where
+ * <code>&lt;JAVA_HOME></code> refers to the directory where the SDK was
+ * installed.</p>
+ *
+ * <p>If the security property is set to the fully qualified name of a
+ * <code>CallbackHandler</code> implementation class, then a
+ * <code>LoginContext</code>will load the specified <code>CallbackHandler</code>
+ * and pass it to the underlying <code>LoginModules</code>. The
+ * <code>LoginContext</code> only loads the default handler if one was not
+ * provided.</p>
+ *
+ * <p>All default handler implementations must provide a public zero-argument
+ * constructor.</p>
+ *
+ */
+public interface CallbackHandler
+{
+
+  /**
+   * <p>Retrieve or display the information requested in the provided
+   * {@link Callback}s.</p>
+   *
+   * <p>The <code>handle()</code> method implementation checks the instance(s)
+   * of the {@link Callback} object(s) passed in to retrieve or display the
+   * requested information. The following example is provided to help
+   * demonstrate what an <code>handle()</code> method implementation might look
+   * like. This example code is for guidance only. Many details, including
+   * proper error handling, are left out for simplicity.</p>
+   *
+   * <pre>
+   *public void handle(Callback[] callbacks)
+   *throws IOException, UnsupportedCallbackException {
+   *   for (int i = 0; i < callbacks.length; i++) {
+   *      if (callbacks[i] instanceof TextOutputCallback) {
+   *         // display the message according to the specified type
+   *         TextOutputCallback toc = (TextOutputCallback)callbacks[i];
+   *         switch (toc.getMessageType()) {
+   *         case TextOutputCallback.INFORMATION:
+   *            System.out.println(toc.getMessage());
+   *            break;
+   *         case TextOutputCallback.ERROR:
+   *            System.out.println("ERROR: " + toc.getMessage());
+   *            break;
+   *         case TextOutputCallback.WARNING:
+   *            System.out.println("WARNING: " + toc.getMessage());
+   *            break;
+   *         default:
+   *            throw new IOException("Unsupported message type: "
+   *                  + toc.getMessageType());
+   *         }
+   *      } else if (callbacks[i] instanceof NameCallback) {
+   *         // prompt the user for a username
+   *         NameCallback nc = (NameCallback)callbacks[i];
+   *         // ignore the provided defaultName
+   *         System.err.print(nc.getPrompt());
+   *         System.err.flush();
+   *         nc.setName((new BufferedReader(
+   *               new InputStreamReader(System.in))).readLine());
+   *      } else if (callbacks[i] instanceof PasswordCallback) {
+   *         // prompt the user for sensitive information
+   *         PasswordCallback pc = (PasswordCallback)callbacks[i];
+   *         System.err.print(pc.getPrompt());
+   *         System.err.flush();
+   *         pc.setPassword(readPassword(System.in));
+   *      } else {
+   *         throw new UnsupportedCallbackException(
+   *               callbacks[i], "Unrecognized Callback");
+   *      }
+   *   }
+   *}
+   *
+   * // Reads user password from given input stream.
+   *private char[] readPassword(InputStream in) throws IOException {
+   *   // insert code to read a user password from the input stream
+   *}
+   * </pre>
+   *
+   * @param callbacks an array of {@link Callback} objects provided by an
+   * underlying security service which contains the information requested to
+   * be retrieved or displayed.
+   * @throws IOException if an input or output error occurs.
+   * @throws UnsupportedCallbackException if the implementation of this method
+   * does not support one or more of the Callbacks specified in the
+   * <code>callbacks</code> parameter.
+   */
+  void handle(Callback[] callbacks) throws IOException, UnsupportedCallbackException;
+}