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/*
 * @(#)CrowdMailAddressResolverImpl.java
 * 
 * The MIT License
 * 
 * Copyright (C)2011 Thorsten Heit.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package de.theit.hudson.crowd;

import hudson.Extension;
import hudson.model.Hudson;
import hudson.model.User;
import hudson.security.SecurityRealm;
import hudson.tasks.MailAddressResolver;

import java.util.logging.Level;
import java.util.logging.Logger;

import org.acegisecurity.userdetails.UsernameNotFoundException;
import org.springframework.dao.DataAccessException;

/**
 * This class resolves email addresses via lookup in Crowd.
 * 
 * @author Thorsten Heit ([email protected])
 * @since 08.09.2011
 * @version $Id$
 */
@Extension
public class CrowdMailAddressResolverImpl extends MailAddressResolver {
	/** For logging purposes. */
	private static final Logger LOG = Logger
			.getLogger(CrowdMailAddressResolverImpl.class.getName());

	/**
	 * {@inheritDoc}
	 * 
	 * @see hudson.tasks.MailAddressResolver#findMailAddressFor(hudson.model.User)
	 */
	@Override
	public String findMailAddressFor(User u) {
		String mail = null;
		SecurityRealm realm = Hudson.getInstance().getSecurityRealm();

		if (realm instanceof CrowdSecurityRealm) {
			try {
				// Workaround:
				// The user object given as parameter contains the user's
				// display name. Looking up a user in Crowd by the full display
				// name doesn't work; we have to use the user's Id instead which
				// is actually appended at the end of the display name in
				// brackets
				String userId = u.getId();
				int pos = userId.lastIndexOf('(');
				if (pos > 0) {
					int pos2 = userId.indexOf(')', pos + 1);
					if (pos2 > pos) {
						userId = userId.substring(pos + 1, pos2);
					}
				}

				if (LOG.isLoggable(Level.FINE)) {
					LOG.fine("Looking up mail address for user: " + userId);
				}
				CrowdUser details = (CrowdUser) realm.getSecurityComponents().userDetails
						.loadUserByUsername(userId);
				mail = details.getEmailAddress();
			} catch (UsernameNotFoundException ex) {
				LOG.info("Failed to look up email address in Crowd");
			} catch (DataAccessException ex) {
				LOG.log(Level.SEVERE,
						"Access exception trying to look up email address in Crowd",
						ex);
			}
		}

		return mail;
	}
}