ca.uhnresearch.pughlab.tracker.security.LdapRealm.java Source code

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Here is the source code for ca.uhnresearch.pughlab.tracker.security.LdapRealm.java

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package ca.uhnresearch.pughlab.tracker.security;

/*
 * 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.
 */
import java.util.ArrayList;
import java.util.Collection;

import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.AuthenticationInfo;
import org.apache.shiro.authc.AuthenticationToken;
import org.apache.shiro.authc.UsernamePasswordToken;
import org.apache.shiro.realm.AuthenticatingRealm;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class LdapRealm extends AuthenticatingRealm {

    private static final Logger log = LoggerFactory.getLogger(LdapRealm.class);

    /**
     * A collection of contexts. Order is not implied here, and we might well
     * end up iterating at random, which is not at all a bad thing if we have 
     * multople servers
     */
    Collection<LdapContext> ldapContexts = new ArrayList<LdapContext>();

    private Collection<LdapContext> getLdapContextsForToken(AuthenticationToken token) {
        Collection<LdapContext> result = new ArrayList<LdapContext>();
        for (LdapContext context : getLdapContexts()) {
            if (context.canAuthenticate(token, this)) {
                result.add(context);
            }
        }
        return result;
    }

    private AuthenticationInfo queryContexts(AuthenticationToken token, Collection<LdapContext> contexts)
            throws AuthenticationException {
        AuthenticationException exception = null;

        for (LdapContext context : contexts) {
            try {
                return context.query(token, this);
            } catch (AuthenticationException e) {
                if (exception == null) {
                    exception = e;
                }
            }
        }

        throw exception;
    }

    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken token) throws AuthenticationException {

        if (token instanceof UsernamePasswordToken) {
            log.debug("Attempting to authenticate: {}", token);
            Collection<LdapContext> contexts = getLdapContextsForToken(token);
            return queryContexts(token, contexts);
        } else {
            throw new AuthenticationException("Invalid token type: " + token.toString());
        }
    }

    /**
     * @return the ldapContexts
     */
    public Collection<LdapContext> getLdapContexts() {
        return ldapContexts;
    }

    /**
     * @param ldapContexts the ldapContexts to set
     */
    public void setLdapContexts(Collection<LdapContext> ldapContexts) {
        this.ldapContexts = ldapContexts;
    }
}