EDIT

/**

* Copyright (C) 2021 EDIT

* European Distributed Institute of Taxonomy

* http://www.e-taxonomy.eu

*

* The contents of this file are subject to the Mozilla Public License Version 1.1

* See LICENSE.TXT at the top of this package for the full license terms.

*/

package eu.etaxonomy.cdm.api.config;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.List;

import java.util.Properties;

import org.apache.logging.log4j.LogManager;import org.apache.logging.log4j.Logger;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;

import org.springframework.core.env.Environment;

import org.springframework.mail.javamail.JavaMailSenderImpl;

/**

 * This class replaces the {@code org.springframework.boot.autoconfigure.mail.MailSenderAutoConfiguration} which can not

 * yet used in this project.

 * <p>

 * The configurations keys contained in here explicitly are not placed in {@link CdmConfigurationKeys} since this class here

 * does only replace missing functionality which otherwise would be provided by the spring boot <code>MailSenderAutoConfiguration</code>.

 *

 * @author a.kohlbecker

 * @since Sep 14, 2021

 */

@Configuration

@AppConfigurationProperties

public class SendEmailConfigurer {

    private static final Logger logger = LogManager.getLogger(SendEmailConfigurer.class);

    @Autowired

    Environment env;

    // conforms to spring boot config

    private static final String HOST = "mail.host";

    public static final String PORT = "mail.port";

    private static final String USERNAME = "mail.username";

    private static final String PASSWORD = "mail.password";

    public static final String FROM_ADDRESS = "mail.from-address";

    private static final String DEFAULT_ENCODING = "mail.default-encoding";

    private static final String[] SMTP_PROPERTY_KEYS = new String[] {"mail.smtp.auth", "mail.smtp.starttls.enable"};

    /**

     * Disables the configuration of the mail system

     * integration tests of the mail system are skipped if this property is set true

     */

    public static final String DISABLED = "mail.disabled";

    public static final String INT_TEST_SERVER = "mail.int-test-server";

    public SendEmailConfigurer() {

    }

    @Bean

    public JavaMailSenderImpl mailSender() {

        reportMailConfiguration();

        boolean disabled = false;

        try {

           disabled = Boolean.valueOf(env.getProperty(DISABLED));

        } catch (Exception e) {

            logger.error("Invalid  property '" + DISABLED + "=" + env.getProperty(DISABLED) + "' for JavaMailSenderImpl configuration");

        }

        if(disabled) {

            logger.warn("JavaMailSenderImpl configuration explictly disabled by property '" + DISABLED + "=true'");

            return null;

        } else {

            JavaMailSenderImpl sender = new JavaMailSenderImpl();

            applyProperties(sender);

            return sender;

        }

    }

    private void applyProperties(JavaMailSenderImpl sender) {

        sender.setHost(env.getProperty(HOST));

        if (env.getProperty(PORT) != null) {

            sender.setPort(Integer.parseInt(env.getProperty(PORT)));

        }

        if (env.getProperty(USERNAME) != null) {

            sender.setUsername(env.getProperty(USERNAME));

        }

        if (env.getProperty(PASSWORD) != null) {

        sender.setPassword(env.getProperty(PASSWORD));

        }

        // sender.setProtocol(this.properties.getProtocol());

        if (env.getProperty(DEFAULT_ENCODING) != null) {

            sender.setDefaultEncoding(env.getProperty(DEFAULT_ENCODING));

        }

        Properties smtpProperties = new Properties();

        for(String key : SMTP_PROPERTY_KEYS) {

            String value = env.getProperty(key);

            if(value != null) {

                smtpProperties.put(key, value);

            }

        }

        sender.setJavaMailProperties(smtpProperties);

    }

    private void reportMailConfiguration() {

        logger.info("+-------------------------------------------");

        logger.info("|          SendEmail Configuration            ");

        configKeys().stream().forEach(key -> logger.info("| " + key + " : " + env.getProperty(key, "[NULL]")));

        logger.info("+--------------------------------------------");

    }

    private List<String> configKeys() {

        List<String> configKeys = new ArrayList<>(Arrays.asList(HOST, PORT, USERNAME, PASSWORD, DISABLED, FROM_ADDRESS, INT_TEST_SERVER));

        configKeys.addAll(Arrays.asList(SMTP_PROPERTY_KEYS));

        return configKeys;

    }

}