J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2000 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| 13 | * accompanied this code). |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License version |
| 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 18 | * |
| 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 21 | * have any questions. |
| 22 | */ |
| 23 | |
| 24 | import java.io.*; |
| 25 | import java.util.Arrays; |
| 26 | import javax.security.auth.callback.*; |
| 27 | |
| 28 | /** |
| 29 | * A default CallbackHandler implementation. |
| 30 | */ |
| 31 | public class DefaultHandlerImpl implements CallbackHandler { |
| 32 | |
| 33 | /** |
| 34 | * Invoke an array of Callbacks. |
| 35 | * |
| 36 | * <p> |
| 37 | * |
| 38 | * @param callbacks an array of <code>Callback</code> objects which contain |
| 39 | * the information requested by an underlying security |
| 40 | * service to be retrieved or displayed. |
| 41 | * |
| 42 | * @exception java.io.IOException if an input or output error occurs. <p> |
| 43 | * |
| 44 | * @exception UnsupportedCallbackException if the implementation of this |
| 45 | * method does not support one or more of the Callbacks |
| 46 | * specified in the <code>callbacks</code> parameter. |
| 47 | */ |
| 48 | public void handle(Callback[] callbacks) |
| 49 | throws IOException, UnsupportedCallbackException { |
| 50 | |
| 51 | for (int i = 0; i < callbacks.length; i++) { |
| 52 | if (callbacks[i] instanceof TextOutputCallback) { |
| 53 | |
| 54 | // display the message according to the specified type |
| 55 | TextOutputCallback toc = (TextOutputCallback)callbacks[i]; |
| 56 | switch (toc.getMessageType()) { |
| 57 | case TextOutputCallback.INFORMATION: |
| 58 | System.out.println(toc.getMessage()); |
| 59 | break; |
| 60 | case TextOutputCallback.ERROR: |
| 61 | System.out.println("ERROR: " + toc.getMessage()); |
| 62 | break; |
| 63 | case TextOutputCallback.WARNING: |
| 64 | System.out.println("WARNING: " + toc.getMessage()); |
| 65 | break; |
| 66 | default: |
| 67 | throw new IOException("Unsupported message type: " + |
| 68 | toc.getMessageType()); |
| 69 | } |
| 70 | |
| 71 | } else if (callbacks[i] instanceof NameCallback) { |
| 72 | |
| 73 | // prompt the user for a username |
| 74 | NameCallback nc = (NameCallback)callbacks[i]; |
| 75 | |
| 76 | // ignore the provided defaultName |
| 77 | System.err.print(nc.getPrompt()); |
| 78 | System.err.flush(); |
| 79 | nc.setName((new BufferedReader |
| 80 | (new InputStreamReader(System.in))).readLine()); |
| 81 | |
| 82 | } else if (callbacks[i] instanceof PasswordCallback) { |
| 83 | |
| 84 | // prompt the user for sensitive information |
| 85 | PasswordCallback pc = (PasswordCallback)callbacks[i]; |
| 86 | System.err.print(pc.getPrompt()); |
| 87 | System.err.flush(); |
| 88 | pc.setPassword(readPassword(System.in)); |
| 89 | |
| 90 | } else { |
| 91 | throw new UnsupportedCallbackException |
| 92 | (callbacks[i], "Unrecognized Callback"); |
| 93 | } |
| 94 | } |
| 95 | } |
| 96 | |
| 97 | // Reads user password from given input stream. |
| 98 | private char[] readPassword(InputStream in) throws IOException { |
| 99 | |
| 100 | char[] lineBuffer; |
| 101 | char[] buf; |
| 102 | int i; |
| 103 | |
| 104 | buf = lineBuffer = new char[128]; |
| 105 | |
| 106 | int room = buf.length; |
| 107 | int offset = 0; |
| 108 | int c; |
| 109 | |
| 110 | loop: while (true) { |
| 111 | switch (c = in.read()) { |
| 112 | case -1: |
| 113 | case '\n': |
| 114 | break loop; |
| 115 | |
| 116 | case '\r': |
| 117 | int c2 = in.read(); |
| 118 | if ((c2 != '\n') && (c2 != -1)) { |
| 119 | if (!(in instanceof PushbackInputStream)) { |
| 120 | in = new PushbackInputStream(in); |
| 121 | } |
| 122 | ((PushbackInputStream)in).unread(c2); |
| 123 | } else |
| 124 | break loop; |
| 125 | |
| 126 | default: |
| 127 | if (--room < 0) { |
| 128 | buf = new char[offset + 128]; |
| 129 | room = buf.length - offset - 1; |
| 130 | System.arraycopy(lineBuffer, 0, buf, 0, offset); |
| 131 | Arrays.fill(lineBuffer, ' '); |
| 132 | lineBuffer = buf; |
| 133 | } |
| 134 | buf[offset++] = (char) c; |
| 135 | break; |
| 136 | } |
| 137 | } |
| 138 | |
| 139 | if (offset == 0) { |
| 140 | return null; |
| 141 | } |
| 142 | |
| 143 | char[] ret = new char[offset]; |
| 144 | System.arraycopy(buf, 0, ret, 0, offset); |
| 145 | Arrays.fill(buf, ' '); |
| 146 | |
| 147 | return ret; |
| 148 | } |
| 149 | } |