/*

  * Copyright 2006-2011 The Kuali Foundation

  *

  * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php

  *

  * 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.kuali.rice.core.mail;

 import org.kuali.rice.core.api.config.property.ConfigContext;

 import org.springframework.beans.factory.config.AbstractFactoryBean;

 import org.springframework.mail.javamail.JavaMailSenderImpl;

 import javax.mail.Authenticator;

 import javax.mail.PasswordAuthentication;

 import javax.mail.Session;

 import java.util.Properties;

 /**

  * A factory bean which reads mail-related properties from the Configuration system and

  * generates a Spring Java Mail Sender instance for use by services that send e-mail.

  * 

  * @author Kuali Rice Team (rice.collab@kuali.org)

  *

  */

 @SuppressWarnings("unchecked")

 public class MailSenderFactoryBean extends AbstractFactoryBean {

         protected final org.apache.log4j.Logger LOG = org.apache.log4j.Logger.getLogger(MailSenderFactoryBean.class);

     private static final String MAIL_PREFIX = "mail";

     private static final String USERNAME_PROPERTY = "mail.smtp.username";

     private static final String PASSWORD_PROPERTY = "mail.smtp.password";

     private static final String HOST_PROPERTY = "mail.smtp.host";

     private static final String PORT_PROPERTY = "mail.smtp.port";

     private Session mailSession;

     @Override

         protected  Object createInstance() throws Exception {

             // Retrieve "mail.*" properties from the configuration system and construct a Properties object

                 Properties properties = new Properties();

                 Properties configProps = ConfigContext.getCurrentContextConfig().getProperties();

                 LOG.debug("createInstance(): collecting mail properties.");

                 for (Object keyObj : configProps.keySet()) {

                     if (keyObj instanceof String) {

                             String key = (String)keyObj;

                             if (key.startsWith(MAIL_PREFIX)){

                                     properties.put(key, configProps.get(key));

                             }

                     }

                 }

                 // Construct an appropriate Java Mail Session

                 // If username and password properties are found, construct a Session with SMTP authentication

                 String username = properties.getProperty(USERNAME_PROPERTY);

                 String password = properties.getProperty(PASSWORD_PROPERTY);

                 if (username != null && password != null) {

                         mailSession = Session.getInstance(properties, new SimpleAuthenticator(username, password));

                         LOG.info("createInstance(): Initializing mail session using SMTP authentication.");

                 } else {

                         mailSession = Session.getInstance(properties);

                         LOG.info("createInstance(): Initializing mail session. No SMTP authentication.");

                 }

                 // Construct and return a Spring Java Mail Sender

                 JavaMailSenderImpl mailSender = new JavaMailSenderImpl();

                 LOG.debug("createInstance(): setting SMTP host.");

                 mailSender.setHost(properties.getProperty(HOST_PROPERTY));

                 if (properties.getProperty(PORT_PROPERTY) != null) {

                         LOG.debug("createInstance(): setting SMTP port.");

                         int smtpPort = Integer.parseInt(properties.getProperty(PORT_PROPERTY).trim());

                         mailSender.setPort(smtpPort);

                 }

                 mailSender.setSession(mailSession);

                 LOG.info("createInstance(): Mail Sender Factory Bean initialized.");

                 return mailSender;

     }

     private class SimpleAuthenticator extends Authenticator {

             private final PasswordAuthentication passwordAuthentication;

         private SimpleAuthenticator(String username, String password) {

                 this.passwordAuthentication = new PasswordAuthentication(username, password);

         }

         public PasswordAuthentication getPasswordAuthentication() {

             return passwordAuthentication;

         }

     }

     @SuppressWarnings("unchecked")

         @Override

     public Class getObjectType() {

         return JavaMailSenderImpl.class;

     }

 }