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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 | } | ||