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| 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 | +} | |