| /* |
| * Copyright (c) 2000, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| import java.io.*; |
| import java.util.Arrays; |
| import javax.security.auth.callback.*; |
| |
| /** |
| * A default CallbackHandler implementation. |
| */ |
| public class DefaultHandlerImpl implements CallbackHandler { |
| |
| /** |
| * Invoke an array of Callbacks. |
| * |
| * <p> |
| * |
| * @param callbacks an array of <code>Callback</code> objects which contain |
| * the information requested by an underlying security |
| * service to be retrieved or displayed. |
| * |
| * @exception java.io.IOException if an input or output error occurs. <p> |
| * |
| * @exception UnsupportedCallbackException if the implementation of this |
| * method does not support one or more of the Callbacks |
| * specified in the <code>callbacks</code> parameter. |
| */ |
| 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 { |
| |
| char[] lineBuffer; |
| char[] buf; |
| int i; |
| |
| buf = lineBuffer = new char[128]; |
| |
| int room = buf.length; |
| int offset = 0; |
| int c; |
| |
| loop: while (true) { |
| switch (c = in.read()) { |
| case -1: |
| case '\n': |
| break loop; |
| |
| case '\r': |
| int c2 = in.read(); |
| if ((c2 != '\n') && (c2 != -1)) { |
| if (!(in instanceof PushbackInputStream)) { |
| in = new PushbackInputStream(in); |
| } |
| ((PushbackInputStream)in).unread(c2); |
| } else |
| break loop; |
| |
| default: |
| if (--room < 0) { |
| buf = new char[offset + 128]; |
| room = buf.length - offset - 1; |
| System.arraycopy(lineBuffer, 0, buf, 0, offset); |
| Arrays.fill(lineBuffer, ' '); |
| lineBuffer = buf; |
| } |
| buf[offset++] = (char) c; |
| break; |
| } |
| } |
| |
| if (offset == 0) { |
| return null; |
| } |
| |
| char[] ret = new char[offset]; |
| System.arraycopy(buf, 0, ret, 0, offset); |
| Arrays.fill(buf, ' '); |
| |
| return ret; |
| } |
| } |