Java tutorial
/** * Kodo Kojo - Software factory done right * Copyright 2016 Kodo Kojo (infos@kodokojo.io) * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package io.kodokojo.config.module; import com.amazonaws.auth.AWSCredentials; import com.amazonaws.auth.DefaultAWSCredentialsProviderChain; import com.amazonaws.regions.Region; import com.amazonaws.regions.Regions; import com.google.inject.AbstractModule; import com.google.inject.Provides; import com.google.inject.Singleton; import io.kodokojo.config.ApplicationConfig; import io.kodokojo.config.AwsConfig; import io.kodokojo.config.EmailConfig; import io.kodokojo.service.EmailSender; import io.kodokojo.service.NoopEmailSender; import io.kodokojo.service.SmtpEmailSender; import io.kodokojo.service.aws.Route53DnsManager; import io.kodokojo.service.aws.SesEmailSender; import io.kodokojo.service.dns.DnsManager; import io.kodokojo.service.dns.NoOpDnsManager; import org.apache.commons.lang.StringUtils; import org.slf4j.Logger; import org.slf4j.LoggerFactory; public class AwsModule extends AbstractModule { private static final Logger LOGGER = LoggerFactory.getLogger(AwsModule.class); @Override protected void configure() { // Nothing to do. } @Provides @Singleton DnsManager provideDnsManager(ApplicationConfig applicationConfig, AwsConfig awsConfig) { AWSCredentials credentials = null; try { DefaultAWSCredentialsProviderChain defaultAWSCredentialsProviderChain = new DefaultAWSCredentialsProviderChain(); credentials = defaultAWSCredentialsProviderChain.getCredentials(); } catch (RuntimeException e) { LOGGER.warn("Unable to retrieve AWS credentials."); } if (StringUtils.isNotBlank(System.getenv("NO_DNS")) || credentials == null) { LOGGER.info("Using NoOpDnsManager as DnsManger implementation"); return new NoOpDnsManager(); } else { LOGGER.info("Using Route53DnsManager as DnsManger implementation"); return new Route53DnsManager(applicationConfig.domain(), Region.getRegion(Regions.fromName(awsConfig.region()))); } } @Provides @Singleton EmailSender provideEmailSender(AwsConfig awsConfig, EmailConfig emailConfig) { if (StringUtils.isBlank(emailConfig.smtpHost())) { AWSCredentials credentials = null; try { DefaultAWSCredentialsProviderChain defaultAWSCredentialsProviderChain = new DefaultAWSCredentialsProviderChain(); credentials = defaultAWSCredentialsProviderChain.getCredentials(); } catch (RuntimeException e) { LOGGER.warn("Unable to retrieve AWS credentials."); } if (credentials == null) { return new NoopEmailSender(); } else { return new SesEmailSender(emailConfig.smtpFrom(), Region.getRegion(Regions.fromName(awsConfig.region()))); } } else { return new SmtpEmailSender(emailConfig.smtpHost(), emailConfig.smtpPort(), emailConfig.smtpUsername(), emailConfig.smtpPassword(), emailConfig.smtpFrom()); } } }