DTGovUserGroupCallbackJetty.java

/**
 * Copyright 2013 JBoss Inc
 *
 * 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.
 */

package org.overlord.dtgov.jbpm.util;

import java.security.Principal;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;

import javax.enterprise.inject.Alternative;
import javax.security.auth.Subject;
import javax.servlet.http.HttpServletRequest;

import org.eclipse.jetty.server.Authentication;
import org.eclipse.jetty.server.Authentication.User;
import org.eclipse.jetty.server.Request;
import org.eclipse.jetty.server.UserIdentity;
import org.kie.internal.task.api.UserGroupCallback;
import org.overlord.commons.auth.filters.HttpRequestThreadLocalFilter;
import org.overlord.commons.auth.filters.SamlBearerTokenAuthFilter;
import org.overlord.commons.auth.filters.SimplePrincipal;
import org.overlord.commons.auth.jetty8.JettyAuthConstants;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Loosely based on org.jbpm.task.identity.JAASUserGroupCallbackImpl
 *
 * @author kstam
 *
 */
@Alternative
public class DTGovUserGroupCallbackJetty implements UserGroupCallback {

	private Logger logger = LoggerFactory.getLogger(this.getClass());

    /**
     * @see org.kie.internal.task.api.UserGroupCallback#existsUser(java.lang.String)
     */
    @Override
    public boolean existsUser(String userId) {
    	// allow everything as there is no way to ask JAAS/JACC for users in the domain
        return true;
    }

    /**
     * @see org.kie.internal.task.api.UserGroupCallback#existsGroup(java.lang.String)
     */
    @Override
    public boolean existsGroup(String groupId) {
    	// allow everything as there is no way to ask JAAS/JACC for groups in the domain
    	return true;
    }

    /**
     * @see org.kie.internal.task.api.UserGroupCallback#getGroupsForUser(java.lang.String, java.util.List, java.util.List)
     */
    @Override
    public List<String> getGroupsForUser(String userId, List<String> groupIds,
            List<String> allExistingGroupIds) {
        // Try our thread local first.  If we're using our own authentication mechanism,
        // we would have stored it in the ThreadLocal for just this purpose.
        SimplePrincipal sp = SamlBearerTokenAuthFilter.TL_principal.get();
        if (sp != null) {
            return new ArrayList<String>(sp.getRoles());
        }

        List<String> roles = new ArrayList<String>();
        try {
            HttpServletRequest request = HttpRequestThreadLocalFilter.TL_request.get();
            Request jettyRequest = (Request) request;
            Authentication authentication = jettyRequest.getAuthentication();
            User userAuth = (User) authentication;
            UserIdentity userIdentity = userAuth.getUserIdentity();
            Subject subject = userIdentity.getSubject();
            for (String cname : JettyAuthConstants.ROLE_CLASSES) {
                try {
                    @SuppressWarnings("unchecked")
                    Class<? extends Principal> c = (Class<? extends Principal>) Thread.currentThread().getContextClassLoader().loadClass(cname);
                    Set<? extends Principal> principals = subject.getPrincipals(c);
                    for (Principal p : principals) {
                        roles.add(p.getName());
                    }
                } catch (ClassNotFoundException e) {
                    // Skip it!
                }
            }
            return roles;
        } catch (Exception e) {
            logger.error("ErrorGettingRoles for user " + userId, e); //$NON-NLS-1$
        }
        return roles;
    }
}