J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * reserved comment block |
| 3 | * DO NOT REMOVE OR ALTER! |
| 4 | */ |
| 5 | /* |
| 6 | * Copyright 1999-2004 The Apache Software Foundation. |
| 7 | * |
| 8 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 9 | * you may not use this file except in compliance with the License. |
| 10 | * You may obtain a copy of the License at |
| 11 | * |
| 12 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 13 | * |
| 14 | * Unless required by applicable law or agreed to in writing, software |
| 15 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 16 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 17 | * See the License for the specific language governing permissions and |
| 18 | * limitations under the License. |
| 19 | * |
| 20 | */ |
| 21 | package com.sun.org.apache.xml.internal.security.c14n.helper; |
| 22 | |
| 23 | |
| 24 | |
| 25 | import com.sun.org.apache.xml.internal.security.c14n.CanonicalizationException; |
| 26 | import org.w3c.dom.Attr; |
| 27 | import org.w3c.dom.Document; |
| 28 | import org.w3c.dom.Element; |
| 29 | import org.w3c.dom.NamedNodeMap; |
| 30 | |
| 31 | |
| 32 | /** |
| 33 | * Temporary swapped static functions from the normalizer Section |
| 34 | * |
| 35 | * @author Christian Geuer-Pollmann |
| 36 | */ |
| 37 | public class C14nHelper { |
| 38 | |
| 39 | /** |
| 40 | * Constructor C14nHelper |
| 41 | * |
| 42 | */ |
| 43 | private C14nHelper() { |
| 44 | |
| 45 | // don't allow instantiation |
| 46 | } |
| 47 | |
| 48 | /** |
| 49 | * Method namespaceIsRelative |
| 50 | * |
| 51 | * @param namespace |
| 52 | * @return true if the given namespace is relative. |
| 53 | */ |
| 54 | public static boolean namespaceIsRelative(Attr namespace) { |
| 55 | return !namespaceIsAbsolute(namespace); |
| 56 | } |
| 57 | |
| 58 | /** |
| 59 | * Method namespaceIsRelative |
| 60 | * |
| 61 | * @param namespaceValue |
| 62 | * @return true if the given namespace is relative. |
| 63 | */ |
| 64 | public static boolean namespaceIsRelative(String namespaceValue) { |
| 65 | return !namespaceIsAbsolute(namespaceValue); |
| 66 | } |
| 67 | |
| 68 | /** |
| 69 | * Method namespaceIsAbsolute |
| 70 | * |
| 71 | * @param namespace |
| 72 | * @return true if the given namespace is absolute. |
| 73 | */ |
| 74 | public static boolean namespaceIsAbsolute(Attr namespace) { |
| 75 | return namespaceIsAbsolute(namespace.getValue()); |
| 76 | } |
| 77 | |
| 78 | /** |
| 79 | * Method namespaceIsAbsolute |
| 80 | * |
| 81 | * @param namespaceValue |
| 82 | * @return true if the given namespace is absolute. |
| 83 | */ |
| 84 | public static boolean namespaceIsAbsolute(String namespaceValue) { |
| 85 | |
| 86 | // assume empty namespaces are absolute |
| 87 | if (namespaceValue.length() == 0) { |
| 88 | return true; |
| 89 | } |
| 90 | return namespaceValue.indexOf(':')>0; |
| 91 | } |
| 92 | |
| 93 | /** |
| 94 | * This method throws an exception if the Attribute value contains |
| 95 | * a relative URI. |
| 96 | * |
| 97 | * @param attr |
| 98 | * @throws CanonicalizationException |
| 99 | */ |
| 100 | public static void assertNotRelativeNS(Attr attr) |
| 101 | throws CanonicalizationException { |
| 102 | |
| 103 | if (attr == null) { |
| 104 | return; |
| 105 | } |
| 106 | |
| 107 | String nodeAttrName = attr.getNodeName(); |
| 108 | boolean definesDefaultNS = nodeAttrName.equals("xmlns"); |
| 109 | boolean definesNonDefaultNS = nodeAttrName.startsWith("xmlns:"); |
| 110 | |
| 111 | if (definesDefaultNS || definesNonDefaultNS) { |
| 112 | if (namespaceIsRelative(attr)) { |
| 113 | String parentName = attr.getOwnerElement().getTagName(); |
| 114 | String attrValue = attr.getValue(); |
| 115 | Object exArgs[] = { parentName, nodeAttrName, attrValue }; |
| 116 | |
| 117 | throw new CanonicalizationException( |
| 118 | "c14n.Canonicalizer.RelativeNamespace", exArgs); |
| 119 | } |
| 120 | } |
| 121 | } |
| 122 | |
| 123 | /** |
| 124 | * This method throws a CanonicalizationException if the supplied Document |
| 125 | * is not able to be traversed using a TreeWalker. |
| 126 | * |
| 127 | * @param document |
| 128 | * @throws CanonicalizationException |
| 129 | */ |
| 130 | public static void checkTraversability(Document document) |
| 131 | throws CanonicalizationException { |
| 132 | |
| 133 | if (!document.isSupported("Traversal", "2.0")) { |
| 134 | Object exArgs[] = { |
| 135 | document.getImplementation().getClass().getName() }; |
| 136 | |
| 137 | throw new CanonicalizationException( |
| 138 | "c14n.Canonicalizer.TraversalNotSupported", exArgs); |
| 139 | } |
| 140 | } |
| 141 | |
| 142 | /** |
| 143 | * This method throws a CanonicalizationException if the supplied Element |
| 144 | * contains any relative namespaces. |
| 145 | * |
| 146 | * @param ctxNode |
| 147 | * @throws CanonicalizationException |
| 148 | * @see C14nHelper#assertNotRelativeNS(Attr) |
| 149 | */ |
| 150 | public static void checkForRelativeNamespace(Element ctxNode) |
| 151 | throws CanonicalizationException { |
| 152 | |
| 153 | if (ctxNode != null) { |
| 154 | NamedNodeMap attributes = ctxNode.getAttributes(); |
| 155 | |
| 156 | for (int i = 0; i < attributes.getLength(); i++) { |
| 157 | C14nHelper.assertNotRelativeNS((Attr) attributes.item(i)); |
| 158 | } |
| 159 | } else { |
| 160 | throw new CanonicalizationException( |
| 161 | "Called checkForRelativeNamespace() on null"); |
| 162 | } |
| 163 | } |
| 164 | } |