| 1 | /* | |
| 2 | * Copyright 2002-2009 the original author or authors. | |
| 3 | * | |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); | |
| 5 | * you may not use this file except in compliance with the License. | |
| 6 | * You may obtain a copy of the License at | |
| 7 | * | |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 | |
| 9 | * | |
| 10 | * Unless required by applicable law or agreed to in writing, software | |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, | |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| 13 | * See the License for the specific language governing permissions and | |
| 14 | * limitations under the License. | |
| 15 | */ | |
| 16 | ||
| 17 | package net.sf.json.util; | |
| 18 | ||
| 19 | /** | |
| 20 | * Defines base implementations for preventing WebHijack in AJAX applications. | |
| 21 | * The default implementations are: | |
| 22 | * <ul> | |
| 23 | * <li>COMMENTS - wraps the string with /* *\/</li> | |
| 24 | * <li>INFINITE_LOOP - prepends "while(1);"</li> | |
| 25 | * </ul> | |
| 26 | * | |
| 27 | * @author Andres Almiray <aalmiray@users.sourceforge.net> | |
| 28 | */ | |
| 29 | 0 | public abstract class WebHijackPreventionStrategy { |
| 30 | /** Wraps the string with /* *\/ */ | |
| 31 | 0 | public static final WebHijackPreventionStrategy COMMENTS = new CommentWebHijackPreventionStrategy(); |
| 32 | /** Prepends "while(1);" */ | |
| 33 | 0 | public static final WebHijackPreventionStrategy INFINITE_LOOP = new InfiniteLoopWebHijackPreventionStrategy(); |
| 34 | ||
| 35 | /** | |
| 36 | * Transforms the input with the desired strategy.<br> | |
| 37 | * | |
| 38 | * @param str a json string | |
| 39 | * @return String - the transformed json string | |
| 40 | */ | |
| 41 | public abstract String protect( String str ); | |
| 42 | ||
| 43 | 0 | private static final class CommentWebHijackPreventionStrategy extends |
| 44 | WebHijackPreventionStrategy { | |
| 45 | public String protect( String str ) { | |
| 46 | 0 | return "/*" + str + "*/"; |
| 47 | } | |
| 48 | } | |
| 49 | ||
| 50 | 0 | private static final class InfiniteLoopWebHijackPreventionStrategy extends |
| 51 | WebHijackPreventionStrategy { | |
| 52 | public String protect( String str ) { | |
| 53 | 0 | return "while(1);" + str; |
| 54 | } | |
| 55 | } | |
| 56 | } |