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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
package org.apache.harmony.javax.security.auth;
import java.security.DomainCombiner;
import java.security.Principal;
import java.security.ProtectionDomain;
import java.util.Set;
/**
* Merges permissions based on code source and code signers with permissions
* granted to the specified {@link Subject}.
*/
public class SubjectDomainCombiner implements DomainCombiner {
// subject to be associated
private Subject subject;
// permission required to get a subject object
private static final AuthPermission _GET = new AuthPermission(
"getSubjectFromDomainCombiner"); //$NON-NLS-1$
/**
* Creates a domain combiner for the entity provided in {@code subject}.
*
* @param subject
* the entity to which this domain combiner is associated.
*/
public SubjectDomainCombiner(Subject subject) {
super();
if (subject == null) {
throw new NullPointerException();
}
this.subject = subject;
}
/**
* Returns the entity to which this domain combiner is associated.
*
* @return the entity to which this domain combiner is associated.
*/
public Subject getSubject() {
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkPermission(_GET);
}
return subject;
}
/**
* Merges the {@code ProtectionDomain} with the {@code Principal}s
* associated with the subject of this {@code SubjectDomainCombiner}.
*
* @param currentDomains
* the {@code ProtectionDomain}s associated with the context of
* the current thread. The domains must be sorted according to
* the execution order, the most recent residing at the
* beginning.
* @param assignedDomains
* the {@code ProtectionDomain}s from the parent thread based on
* code source and signers.
* @return a single {@code ProtectionDomain} array computed from the two
* provided arrays, or {@code null}.
* @see ProtectionDomain
*/
public ProtectionDomain[] combine(ProtectionDomain[] currentDomains,
ProtectionDomain[] assignedDomains) {
// get array length for combining protection domains
int len = 0;
if (currentDomains != null) {
len += currentDomains.length;
}
if (assignedDomains != null) {
len += assignedDomains.length;
}
if (len == 0) {
return null;
}
ProtectionDomain[] pd = new ProtectionDomain[len];
// for each current domain substitute set of principal with subject's
int cur = 0;
if (currentDomains != null) {
Set<Principal> s = subject.getPrincipals();
Principal[] p = s.toArray(new Principal[s.size()]);
for (cur = 0; cur < currentDomains.length; cur++) {
if (currentDomains[cur] != null) {
ProtectionDomain newPD;
newPD = new ProtectionDomain(currentDomains[cur].getCodeSource(),
currentDomains[cur].getPermissions(), currentDomains[cur]
.getClassLoader(), p);
pd[cur] = newPD;
}
}
}
// copy assigned domains
if (assignedDomains != null) {
System.arraycopy(assignedDomains, 0, pd, cur, assignedDomains.length);
}
return pd;
}
}
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