/*
 *  RapidMiner
 *
 *  Copyright (C) 2001-2014 by RapidMiner and the contributors
 *
 *  Complete list of developers available at our web site:
 *
 *       http://rapidminer.com
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with this program.  If not, see http://www.gnu.org/licenses/.
 */
package com.rapidminer.tools;

import java.util.Properties;
import java.util.logging.Level;

import javax.mail.Authenticator;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;

import com.rapidminer.RapidMiner;
import com.rapidminer.tools.cipher.CipherException;
import com.rapidminer.tools.cipher.CipherTools;

/** Makes a session based on RapidMiner properties.
 * 
 * @author Simon Fischer
 *
 */
public class DefaultMailSessionFactory implements MailSessionFactory {

    @Override
    public Session makeSession() {
        String host = ParameterService.getParameterValue(RapidMiner.PROPERTY_RAPIDMINER_TOOLS_SMTP_HOST);
        if (host == null) {
            //LogService.getRoot().warning("Must specify SMTP host in "+RapidMiner.PROPERTY_RAPIDMINER_TOOLS_SMTP_HOST+" to use SMTP.");
            LogService.getRoot().log(Level.WARNING, "com.rapidminer.tools.DefaultMailSessionFactory.smtp_host_must_be_specified", RapidMiner.PROPERTY_RAPIDMINER_TOOLS_SMTP_HOST);
            return null;
        } else {
            Properties props = new Properties();
            props.put("mail.smtp.host", host);
            props.put("mail.from", "no-reply@rapidminer.com");
            final String user = ParameterService.getParameterValue(RapidMiner.PROPERTY_RAPIDMINER_TOOLS_SMTP_USER);
            props.put("mail.user", user);
            Authenticator authenticator = null;
            final String passwd;
            try {
            	if (CipherTools.isKeyAvailable()) {
            		passwd = CipherTools.decrypt(ParameterService.getParameterValue(RapidMiner.PROPERTY_RAPIDMINER_TOOLS_SMTP_PASSWD));
        		} else {
        			passwd = "";
        			LogService.getRoot().log(Level.WARNING, "com.rapidminer.tools.DefaultMailSessionFactory.smtp_password_cipher_missing");
        		}
            	if (passwd.length() > 0) {
            		props.setProperty("mail.smtp.submitter", user);
            		props.setProperty("mail.smtp.auth", "true");
            		authenticator = new Authenticator() {
            			@Override
            			protected PasswordAuthentication getPasswordAuthentication() {
            				return new PasswordAuthentication(user, passwd);
            			}
            		};
            	}
            } catch (CipherException e) {
            	LogService.getRoot().log(Level.WARNING, "com.rapidminer.tools.DefaultMailSessionFactory.smtp_password_decode_failed");
            }
            String port = ParameterService.getParameterValue(RapidMiner.PROPERTY_RAPIDMINER_TOOLS_SMTP_PORT);
            if (port != null) {
                props.setProperty("mail.smtp.port", port);
            }
            return Session.getInstance(props, authenticator);
        }
    }

}