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/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2010, Red Hat Middleware LLC, and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.picketlink.trust.jbossws.handler;

import java.security.Principal;
import java.security.acl.Group;
import java.util.Enumeration;
import org.apache.cxf.phase.PhaseInterceptorChain;
import org.apache.cxf.security.SecurityContext;
import org.picketlink.identity.federation.core.wstrust.SamlCredential;

import javax.xml.ws.handler.MessageContext;

import javax.security.auth.Subject;

/**
 * implementation for {@link AbstractSAML2Handler} specific for the JBoss AS7 binding.
 * 
 * @author Marcus Moyses
 * @author Alessio Soldano
 * @author Anil Saldhana
 * @version $Revision: 1 $
 */
public class SAML2Handler extends AbstractSAML2Handler {

    /* (non-Javadoc)
     * @see org.picketlink.trust.jbossws.handler.AbstractSAML2Handler#propagateSubject(org.picketlink.identity.federation.core.wstrust.SamlCredential, javax.security.auth.Subject, java.security.Principal)
     */
    @Override
    protected void createSecurityContext(SamlCredential credential,final  Subject theSubject, final Principal principal, final MessageContext msgContext) {
        super.createSecurityContext(credential, theSubject, principal, msgContext);
        org.apache.cxf.security.SecurityContext secContext = createCXFSecurityContext(theSubject, principal);
        
        if (PhaseInterceptorChain.getCurrentMessage() != null) {
            PhaseInterceptorChain.getCurrentMessage().put(org.apache.cxf.security.SecurityContext.class, secContext);            
        }
    }

    /**
     * Creates an instance of {@link SecurityContext}.
     * 
     * @param theSubject
     * @param principal
     * @return
     * @return
     */
    private SecurityContext createCXFSecurityContext(final Subject theSubject, final Principal principal) {
        return new org.apache.cxf.security.SecurityContext() {

            public boolean isUserInRole(String role) {
                if (theSubject == null || theSubject.getPrincipals().size() <= 1) {
                    return false;
                }
                for (Principal principal : theSubject.getPrincipals()) {
                    if (principal instanceof Group && checkGroup((Group) principal, role)) {
                        return true;
                    }
                }
                return false;
            }

            public Principal getUserPrincipal() {
                return principal;
            }
        };
    }

    protected boolean checkGroup(Group group, String role) {
        if (group.getName().equals(role)) {
            return true;
        }

        for (Enumeration members = group.members(); members.hasMoreElements();) {
            // this might be a plain role but could represent a group consisting of other groups/roles
            Principal member = members.nextElement();
            if (member.getName().equals(role) || member instanceof Group && checkGroup((Group) member, role)) {
                return true;
            }
        }
        return false;
    }

}