/**
*
*/
package com.thinkbiganalytics.auth;
/*-
* #%L
* thinkbig-security-auth
* %%
* Copyright (C) 2017 ThinkBig Analytics
* %%
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* #L%
*/
import org.springframework.security.authentication.jaas.AuthorityGranter;
import java.security.Principal;
import java.security.acl.Group;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Set;
/**
* A granter that, when presented with a Group principal, returns a set containing the name of that principal (the group's name)
* and another name constructed by prefixing "ROLE_" to the upper case principal name (Spring's default role name format.)
* If the group contains member principals then it will add authorities for those as well; including, recursively, any of the
* member's memberships if they are groups themselves.
*/
public class GroupPrincipalAuthorityGranter implements AuthorityGranter {
/* (non-Javadoc)
* @see org.springframework.security.authentication.jaas.AuthorityGranter#grant(java.security.Principal)
*/
@Override
public Set<String> grant(Principal principal) {
if (principal instanceof Group) {
Set<String> authorities = new HashSet<>();
addAuthorities(principal, authorities);
return authorities;
} else {
return null;
}
}
private void addAuthorities(Principal principal, Set<String> authorities) {
String name = principal.getName();
authorities.add(name);
if (principal instanceof Group) {
String springRole = name.toUpperCase().startsWith("ROLE_") ? name.toUpperCase() : "ROLE_" + name.toUpperCase();
authorities.add(springRole);
Enumeration<? extends Principal> members = ((Group) principal).members();
while (members.hasMoreElements()) {
addAuthorities(members.nextElement(), authorities);
}
}
}
}