mirror of
https://codeberg.org/Mercury-IM/Smack
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2) Check for null value in error type to handle invalid error types. git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/trunk@5737 b35dd754-fafc-0310-a699-88a17e54d16e
504 lines
18 KiB
Java
504 lines
18 KiB
Java
/**
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* $RCSfile$
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* $Revision$
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* $Date$
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*
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* Copyright 2003-2004 Jive Software.
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*
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* All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.jivesoftware.smack.util;
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import java.io.UnsupportedEncodingException;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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import java.util.Random;
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/**
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* A collection of utility methods for String objects.
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*/
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public class StringUtils {
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private static final char[] QUOTE_ENCODE = """.toCharArray();
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private static final char[] AMP_ENCODE = "&".toCharArray();
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private static final char[] LT_ENCODE = "<".toCharArray();
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private static final char[] GT_ENCODE = ">".toCharArray();
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/**
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* Returns the name portion of a XMPP address. For example, for the
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* address "matt@jivesoftware.com/Smack", "matt" would be returned. If no
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* username is present in the address, the empty string will be returned.
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*
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* @param XMPPAddress the XMPP address.
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* @return the name portion of the XMPP address.
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*/
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public static String parseName(String XMPPAddress) {
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if (XMPPAddress == null) {
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return null;
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}
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int atIndex = XMPPAddress.lastIndexOf("@");
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if (atIndex <= 0) {
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return "";
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}
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else {
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return XMPPAddress.substring(0, atIndex);
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}
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}
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/**
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* Returns the server portion of a XMPP address. For example, for the
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* address "matt@jivesoftware.com/Smack", "jivesoftware.com" would be returned.
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* If no server is present in the address, the empty string will be returned.
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*
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* @param XMPPAddress the XMPP address.
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* @return the server portion of the XMPP address.
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*/
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public static String parseServer(String XMPPAddress) {
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if (XMPPAddress == null) {
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return null;
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}
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int atIndex = XMPPAddress.lastIndexOf("@");
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// If the String ends with '@', return the empty string.
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if (atIndex + 1 > XMPPAddress.length()) {
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return "";
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}
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int slashIndex = XMPPAddress.indexOf("/");
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if (slashIndex > 0 && slashIndex > atIndex) {
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return XMPPAddress.substring(atIndex + 1, slashIndex);
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}
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else {
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return XMPPAddress.substring(atIndex + 1);
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}
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}
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/**
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* Returns the resource portion of a XMPP address. For example, for the
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* address "matt@jivesoftware.com/Smack", "Smack" would be returned. If no
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* resource is present in the address, the empty string will be returned.
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*
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* @param XMPPAddress the XMPP address.
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* @return the resource portion of the XMPP address.
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*/
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public static String parseResource(String XMPPAddress) {
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if (XMPPAddress == null) {
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return null;
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}
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int slashIndex = XMPPAddress.indexOf("/");
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if (slashIndex + 1 > XMPPAddress.length() || slashIndex < 0) {
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return "";
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}
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else {
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return XMPPAddress.substring(slashIndex + 1);
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}
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}
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/**
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* Returns the XMPP address with any resource information removed. For example,
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* for the address "matt@jivesoftware.com/Smack", "matt@jivesoftware.com" would
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* be returned.
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*
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* @param XMPPAddress the XMPP address.
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* @return the bare XMPP address without resource information.
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*/
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public static String parseBareAddress(String XMPPAddress) {
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if (XMPPAddress == null) {
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return null;
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}
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int slashIndex = XMPPAddress.indexOf("/");
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if (slashIndex < 0) {
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return XMPPAddress;
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}
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else if (slashIndex == 0) {
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return "";
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}
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else {
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return XMPPAddress.substring(0, slashIndex);
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}
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}
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/**
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* Escapes the node portion of a JID according to "JID Escaping" (JEP-0106).
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* Escaping replaces characters prohibited by node-prep with escape sequences,
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* as follows:<p>
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*
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* <table border="1">
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* <tr><td><b>Unescaped Character</b></td><td><b>Encoded Sequence</b></td></tr>
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* <tr><td><space></td><td>\20</td></tr>
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* <tr><td>"</td><td>\22</td></tr>
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* <tr><td>&</td><td>\26</td></tr>
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* <tr><td>'</td><td>\27</td></tr>
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* <tr><td>/</td><td>\2f</td></tr>
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* <tr><td>:</td><td>\3a</td></tr>
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* <tr><td><</td><td>\3c</td></tr>
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* <tr><td>></td><td>\3e</td></tr>
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* <tr><td>@</td><td>\40</td></tr>
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* <tr><td>\</td><td>\5c</td></tr>
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* </table><p>
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*
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* This process is useful when the node comes from an external source that doesn't
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* conform to nodeprep. For example, a username in LDAP may be "Joe Smith". Because
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* the <space> character isn't a valid part of a node, the username should
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* be escaped to "Joe\20Smith" before being made into a JID (e.g. "joe\20smith@example.com"
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* after case-folding, etc. has been applied).<p>
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*
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* All node escaping and un-escaping must be performed manually at the appropriate
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* time; the JID class will not escape or un-escape automatically.
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*
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* @param node the node.
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* @return the escaped version of the node.
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*/
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public static String escapeNode(String node) {
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if (node == null) {
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return null;
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}
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StringBuilder buf = new StringBuilder(node.length() + 8);
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for (int i=0, n=node.length(); i<n; i++) {
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char c = node.charAt(i);
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switch (c) {
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case '"': buf.append("\\22"); break;
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case '&': buf.append("\\26"); break;
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case '\'': buf.append("\\27"); break;
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case '/': buf.append("\\2f"); break;
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case ':': buf.append("\\3a"); break;
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case '<': buf.append("\\3c"); break;
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case '>': buf.append("\\3e"); break;
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case '@': buf.append("\\40"); break;
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case '\\': buf.append("\\5c"); break;
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default: {
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if (Character.isWhitespace(c)) {
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buf.append("\\20");
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}
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else {
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buf.append(c);
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}
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}
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}
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}
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return buf.toString();
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}
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/**
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* Un-escapes the node portion of a JID according to "JID Escaping" (JEP-0106).<p>
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* Escaping replaces characters prohibited by node-prep with escape sequences,
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* as follows:<p>
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*
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* <table border="1">
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* <tr><td><b>Unescaped Character</b></td><td><b>Encoded Sequence</b></td></tr>
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* <tr><td><space></td><td>\20</td></tr>
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* <tr><td>"</td><td>\22</td></tr>
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* <tr><td>&</td><td>\26</td></tr>
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* <tr><td>'</td><td>\27</td></tr>
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* <tr><td>/</td><td>\2f</td></tr>
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* <tr><td>:</td><td>\3a</td></tr>
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* <tr><td><</td><td>\3c</td></tr>
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* <tr><td>></td><td>\3e</td></tr>
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* <tr><td>@</td><td>\40</td></tr>
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* <tr><td>\</td><td>\5c</td></tr>
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* </table><p>
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*
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* This process is useful when the node comes from an external source that doesn't
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* conform to nodeprep. For example, a username in LDAP may be "Joe Smith". Because
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* the <space> character isn't a valid part of a node, the username should
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* be escaped to "Joe\20Smith" before being made into a JID (e.g. "joe\20smith@example.com"
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* after case-folding, etc. has been applied).<p>
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*
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* All node escaping and un-escaping must be performed manually at the appropriate
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* time; the JID class will not escape or un-escape automatically.
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*
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* @param node the escaped version of the node.
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* @return the un-escaped version of the node.
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*/
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public static String unescapeNode(String node) {
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if (node == null) {
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return null;
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}
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char [] nodeChars = node.toCharArray();
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StringBuilder buf = new StringBuilder(nodeChars.length);
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for (int i=0, n=nodeChars.length; i<n; i++) {
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compare: {
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char c = node.charAt(i);
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if (c == '\\' && i+2<n) {
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char c2 = nodeChars[i+1];
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char c3 = nodeChars[i+2];
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if (c2 == '2') {
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switch (c3) {
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case '0': buf.append(' '); i+=2; break compare;
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case '2': buf.append('"'); i+=2; break compare;
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case '6': buf.append('&'); i+=2; break compare;
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case '7': buf.append('\''); i+=2; break compare;
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case 'f': buf.append('/'); i+=2; break compare;
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}
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}
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else if (c2 == '3') {
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switch (c3) {
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case 'a': buf.append(':'); i+=2; break compare;
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case 'c': buf.append('<'); i+=2; break compare;
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case 'e': buf.append('>'); i+=2; break compare;
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}
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}
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else if (c2 == '4') {
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if (c3 == '0') {
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buf.append("@");
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i+=2;
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break compare;
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}
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}
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else if (c2 == '5') {
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if (c3 == 'c') {
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buf.append("\\");
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i+=2;
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break compare;
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}
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}
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}
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buf.append(c);
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}
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}
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return buf.toString();
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}
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/**
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* Escapes all necessary characters in the String so that it can be used
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* in an XML doc.
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*
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* @param string the string to escape.
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* @return the string with appropriate characters escaped.
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*/
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public static String escapeForXML(String string) {
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if (string == null) {
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return null;
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}
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char ch;
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int i=0;
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int last=0;
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char[] input = string.toCharArray();
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int len = input.length;
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StringBuilder out = new StringBuilder((int)(len*1.3));
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for (; i < len; i++) {
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ch = input[i];
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if (ch > '>') {
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}
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else if (ch == '<') {
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if (i > last) {
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out.append(input, last, i - last);
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}
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last = i + 1;
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out.append(LT_ENCODE);
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}
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else if (ch == '>') {
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if (i > last) {
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out.append(input, last, i - last);
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}
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last = i + 1;
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out.append(GT_ENCODE);
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}
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else if (ch == '&') {
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if (i > last) {
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out.append(input, last, i - last);
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}
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// Do nothing if the string is of the form ë (unicode value)
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if (!(len > i + 5
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&& input[i + 1] == '#'
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&& Character.isDigit(input[i + 2])
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&& Character.isDigit(input[i + 3])
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&& Character.isDigit(input[i + 4])
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&& input[i + 5] == ';')) {
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last = i + 1;
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out.append(AMP_ENCODE);
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}
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}
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else if (ch == '"') {
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if (i > last) {
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out.append(input, last, i - last);
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}
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last = i + 1;
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out.append(QUOTE_ENCODE);
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}
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}
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if (last == 0) {
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return string;
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}
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if (i > last) {
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out.append(input, last, i - last);
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}
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return out.toString();
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}
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/**
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* Used by the hash method.
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*/
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private static MessageDigest digest = null;
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/**
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* Hashes a String using the SHA-1 algorithm and returns the result as a
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* String of hexadecimal numbers. This method is synchronized to avoid
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* excessive MessageDigest object creation. If calling this method becomes
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* a bottleneck in your code, you may wish to maintain a pool of
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* MessageDigest objects instead of using this method.
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* <p>
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* A hash is a one-way function -- that is, given an
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* input, an output is easily computed. However, given the output, the
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* input is almost impossible to compute. This is useful for passwords
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* since we can store the hash and a hacker will then have a very hard time
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* determining the original password.
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*
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* @param data the String to compute the hash of.
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* @return a hashed version of the passed-in String
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*/
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public synchronized static String hash(String data) {
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if (digest == null) {
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try {
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digest = MessageDigest.getInstance("SHA-1");
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}
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catch (NoSuchAlgorithmException nsae) {
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System.err.println("Failed to load the SHA-1 MessageDigest. " +
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"Jive will be unable to function normally.");
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}
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}
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// Now, compute hash.
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try {
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digest.update(data.getBytes("UTF-8"));
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}
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catch (UnsupportedEncodingException e) {
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System.err.println(e);
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}
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return encodeHex(digest.digest());
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}
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/**
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* Encodes an array of bytes as String representation of hexadecimal.
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*
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* @param bytes an array of bytes to convert to a hex string.
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* @return generated hex string.
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*/
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public static String encodeHex(byte[] bytes) {
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StringBuilder hex = new StringBuilder(bytes.length * 2);
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for (byte aByte : bytes) {
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if (((int) aByte & 0xff) < 0x10) {
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hex.append("0");
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}
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hex.append(Integer.toString((int) aByte & 0xff, 16));
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}
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return hex.toString();
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}
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/**
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* Encodes a String as a base64 String.
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*
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* @param data a String to encode.
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* @return a base64 encoded String.
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*/
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public static String encodeBase64(String data) {
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byte [] bytes = null;
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try {
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bytes = data.getBytes("ISO-8859-1");
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}
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catch (UnsupportedEncodingException uee) {
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uee.printStackTrace();
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}
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return encodeBase64(bytes);
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}
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/**
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* Encodes a byte array into a base64 String.
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*
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* @param data a byte array to encode.
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* @return a base64 encode String.
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*/
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public static String encodeBase64(byte[] data) {
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return encodeBase64(data, false);
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}
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/**
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* Encodes a byte array into a bse64 String.
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*
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* @param data The byte arry to encode.
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* @param lineBreaks True if the encoding should contain line breaks and false if it should not.
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* @return A base64 encoded String.
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*/
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public static String encodeBase64(byte[] data, boolean lineBreaks) {
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return encodeBase64(data, 0, data.length, lineBreaks);
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}
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/**
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* Encodes a byte array into a bse64 String.
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*
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* @param data The byte arry to encode.
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* @param offset the offset of the bytearray to begin encoding at.
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* @param len the length of bytes to encode.
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* @param lineBreaks True if the encoding should contain line breaks and false if it should not.
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* @return A base64 encoded String.
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*/
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public static String encodeBase64(byte[] data, int offset, int len, boolean lineBreaks) {
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return Base64.encodeBytes(data, offset, len, (lineBreaks ? Base64.NO_OPTIONS : Base64.DONT_BREAK_LINES));
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}
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/**
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* Decodes a base64 String.
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*
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* @param data a base64 encoded String to decode.
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* @return the decoded String.
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*/
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public static byte[] decodeBase64(String data) {
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return Base64.decode(data);
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}
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/**
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* Pseudo-random number generator object for use with randomString().
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* The Random class is not considered to be cryptographically secure, so
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* only use these random Strings for low to medium security applications.
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*/
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private static Random randGen = new Random();
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/**
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* Array of numbers and letters of mixed case. Numbers appear in the list
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* twice so that there is a more equal chance that a number will be picked.
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* We can use the array to get a random number or letter by picking a random
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* array index.
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*/
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private static char[] numbersAndLetters = ("0123456789abcdefghijklmnopqrstuvwxyz" +
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"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ").toCharArray();
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/**
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* Returns a random String of numbers and letters (lower and upper case)
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* of the specified length. The method uses the Random class that is
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* built-in to Java which is suitable for low to medium grade security uses.
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* This means that the output is only pseudo random, i.e., each number is
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* mathematically generated so is not truly random.<p>
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*
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* The specified length must be at least one. If not, the method will return
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* null.
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*
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* @param length the desired length of the random String to return.
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* @return a random String of numbers and letters of the specified length.
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*/
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public static String randomString(int length) {
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if (length < 1) {
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return null;
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}
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// Create a char buffer to put random letters and numbers in.
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char [] randBuffer = new char[length];
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for (int i=0; i<randBuffer.length; i++) {
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randBuffer[i] = numbersAndLetters[randGen.nextInt(71)];
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}
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return new String(randBuffer);
|
|
}
|
|
|
|
private StringUtils() {
|
|
// Not instantiable.
|
|
}
|
|
} |