1 /*
2 * Copyright 2004-2009 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 org.springmodules.validation.valang.functions;
18
19 import java.util.Collection;
20
21 import org.springframework.security.core.Authentication;
22 import org.springframework.security.core.GrantedAuthority;
23 import org.springframework.security.core.context.SecurityContextHolder;
24
25 /**
26 * A function that accepts a one string argument that indicates a security role. This function
27 * returns a <code>true</code> if the current user is in the passed in role, and <code>false</code>
28 * otherwise.
29 * <br/><br/>
30 * This method uses Acegi's <code>SecurityContextHolder.getContext().getAuthentication()</code> to
31 * get the current user.
32 * <br/><br/>
33 * This function may be used to apply different validation rules based on the logged in user roles.
34 *
35 * @author Uri Boness
36 * @since May 25, 2006
37 */
38 public class InRoleFunction extends AbstractFunction {
39
40 public InRoleFunction(Function[] arguments, int line, int column) {
41 super(arguments, line, column);
42 definedExactNumberOfArguments(1);
43 }
44
45 protected Object doGetResult(Object target) {
46
47 Object role = getArguments()[0].getResult(target);
48
49 Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
50 if (authentication == null) {
51 return Boolean.FALSE;
52 }
53
54 Collection<? extends GrantedAuthority> authorities = authentication.getAuthorities();
55
56 for (GrantedAuthority authority : authorities) {
57 if (authority.equals(role)) {
58 return Boolean.TRUE;
59 }
60 }
61
62 return Boolean.FALSE;
63 }
64
65 }