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Simple SMTP sender for java applications
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/*
 * Copyright 2015 Agapsys Tecnologia Ltda-ME.
 *
 * 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 com.agapsys.mail;

import java.util.Properties;
import javax.mail.Authenticator;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.MimeMessage;

/**
 * Mail sender
 * @author Leandro Oliveira ([email protected])
 */
public class SmtpSender {
	private final Properties props;
	private final Authenticator authenticator;

	public SmtpSender() {
		this(new SmtpSettings());
	}

	public SmtpSender(SmtpSettings smtpSettings) {
		if (smtpSettings == null)
			throw new IllegalArgumentException("Null smtpSettings");

		this.props = new Properties();
		props.put("mail.smtp.host", smtpSettings.getServer());
		props.put("mail.smtp.port", String.format("%d", smtpSettings.getPort()));
		props.put("mail.smtp.auth", smtpSettings.isAuthenticationEnabled() ? "true" : "false");
		smtpSettings.getSecurityType().updateProperties(smtpSettings, props);

		final String username = smtpSettings.getUsername();
		final char[] password = smtpSettings.getPassword();

		if (smtpSettings.isAuthenticationEnabled()) {
			authenticator = new Authenticator() {
				@Override
				protected PasswordAuthentication getPasswordAuthentication() {
					return new PasswordAuthentication(username, new String(password));
				}
			};
		} else {
			authenticator = null;
		}
	}

	public void sendMessage(Message message) throws MessagingException {
		Session session;
		if (authenticator != null) {
			session = Session.getInstance(props, authenticator);
		} else {
			session = Session.getInstance(props);
		}

		MimeMessage mimeMessage = message.getMimeMessage(session);
		Transport.send(mimeMessage);
	}
}