1 /* 2 * Copyright (c) 1998, 2004, Oracle and/or its affiliates. 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. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package sun.security.util; 27 28 import java.net.URI; 29 import java.net.URISyntaxException; 30 import java.security.GeneralSecurityException; 31 32 /** 33 * A utility class to expand properties embedded in a string. 34 * Strings of the form ${some.property.name} are expanded to 35 * be the value of the property. Also, the special ${/} property 36 * is expanded to be the same as file.separator. If a property 37 * is not set, a GeneralSecurityException will be thrown. 38 * 39 * @author Roland Schemers 40 */ 41 public class PropertyExpander { 42 43 44 public static class ExpandException extends GeneralSecurityException { 45 46 private static final long serialVersionUID = -7941948581406161702L; 47 48 public ExpandException(String msg) { 49 super(msg); 50 } 51 } 52 53 public static String expand(String value) 54 throws ExpandException 55 { 56 return expand(value, false); 57 } 58 59 public static String expand(String value, boolean encodeURL) 60 throws ExpandException 61 { 62 if (value == null) 63 return null; 64 65 int p = value.indexOf("${", 0); 66 67 // no special characters 68 if (p == -1) return value; 69 70 StringBuffer sb = new StringBuffer(value.length()); 71 int max = value.length(); 72 int i = 0; // index of last character we copied 73 74 scanner: 75 while (p < max) { 76 if (p > i) { 77 // copy in anything before the special stuff 78 sb.append(value.substring(i, p)); 79 i = p; 80 } 81 int pe = p+2; 82 83 // do not expand ${{ ... }} 84 if (pe < max && value.charAt(pe) == '{') { 85 pe = value.indexOf("}}", pe); 86 if (pe == -1 || pe+2 == max) { 87 // append remaining chars 88 sb.append(value.substring(p)); 89 break scanner; 90 } else { 91 // append as normal text 92 pe++; 93 sb.append(value.substring(p, pe+1)); 94 } 95 } else { 96 while ((pe < max) && (value.charAt(pe) != '}')) { 97 pe++; 98 } 99 if (pe == max) { 100 // no matching '}' found, just add in as normal text 101 sb.append(value.substring(p, pe)); 102 break scanner; 103 } 104 String prop = value.substring(p+2, pe); 105 if (prop.equals("/")) { 106 sb.append(java.io.File.separatorChar); 107 } else { 108 String val = System.getProperty(prop); 109 if (val != null) { 110 if (encodeURL) { 111 // encode 'val' unless it's an absolute URI 112 // at the beginning of the string buffer 113 try { 114 if (sb.length() > 0 || 115 !(new URI(val)).isAbsolute()) { 116 val = sun.net.www.ParseUtil.encodePath(val); 117 } 118 } catch (URISyntaxException use) { 119 val = sun.net.www.ParseUtil.encodePath(val); 120 } 121 } 122 sb.append(val); 123 } else { 124 throw new ExpandException( 125 "unable to expand property " + 126 prop); 127 } 128 } 129 } 130 i = pe+1; 131 p = value.indexOf("${", i); 132 if (p == -1) { 133 // no more to expand. copy in any extra 134 if (i < max) { 135 sb.append(value.substring(i, max)); 136 } 137 // break out of loop 138 break scanner; 139 } 140 } 141 return sb.toString(); 142 } 143 } 144
