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package org.apache.james.mailets;

import static org.apache.james.MemoryJamesServerMain.SMTP_AND_IMAP_MODULE;
import static org.apache.james.MemoryJamesServerMain.SMTP_ONLY_MODULE;
import static org.apache.james.mailets.configuration.Constants.DEFAULT_DOMAIN;
import static org.apache.james.mailets.configuration.Constants.LOCALHOST_IP;
import static org.apache.james.mailets.configuration.Constants.PASSWORD;
import static org.apache.james.mailets.configuration.Constants.awaitAtMostOneMinute;
import static org.apache.james.mailets.configuration.MailetConfiguration.LOCAL_DELIVERY;
import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.hasSize;

import java.net.InetAddress;
import java.util.List;

import org.apache.james.dnsservice.api.DNSService;
import org.apache.james.dnsservice.api.InMemoryDNSService;
import org.apache.james.mailets.configuration.CommonProcessors;
import org.apache.james.mailets.configuration.MailetConfiguration;
import org.apache.james.mailets.configuration.MailetContainer;
import org.apache.james.mailets.configuration.ProcessorConfiguration;
import org.apache.james.modules.protocols.ImapGuiceProbe;
import org.apache.james.modules.protocols.SmtpGuiceProbe;
import org.apache.james.probe.DataProbe;
import org.apache.james.transport.matchers.All;
import org.apache.james.utils.DataProbeImpl;
import org.apache.james.utils.FakeSmtp;
import org.apache.james.utils.IMAPMessageReader;
import org.apache.james.utils.SMTPMessageSender;
import org.junit.After;
import org.junit.ClassRule;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.TemporaryFolder;

import com.google.common.collect.ImmutableList;

public class DirectResolutionRemoteDeliveryIntegrationTest {
    private static final String JAMES_ANOTHER_DOMAIN = "james.com";
    private static final String JAMES_ANOTHER_MX_DOMAIN_1 = "mx1.james.com";
    private static final String JAMES_ANOTHER_MX_DOMAIN_2 = "mx2.james.com";
    private static final List<String> JAMES_ANOTHER_MX_DOMAINS = ImmutableList.of(JAMES_ANOTHER_MX_DOMAIN_1, JAMES_ANOTHER_MX_DOMAIN_2);

    private static final String FROM = "from@" + DEFAULT_DOMAIN;
    private static final String RECIPIENT = "touser@" + JAMES_ANOTHER_DOMAIN;

    private static final ImmutableList<InetAddress> ADDRESS_EMPTY_LIST = ImmutableList.of();
    private static final ImmutableList<String> RECORD_EMPTY_LIST = ImmutableList.of();

    @Rule
    public TemporaryFolder temporaryFolder = new TemporaryFolder();
    @Rule
    public IMAPMessageReader imapMessageReader = new IMAPMessageReader();
    @Rule
    public SMTPMessageSender messageSender = new SMTPMessageSender(DEFAULT_DOMAIN);
    @ClassRule
    public static FakeSmtp fakeSmtp = FakeSmtp.withDefaultPort();
    @ClassRule
    public static FakeSmtp fakeSmtpOnPort26 = FakeSmtp.withSmtpPort(26);

    private TemporaryJamesServer jamesServer;
    private DataProbe dataProbe;

    @After
    public void tearDown() {
        fakeSmtp.clean();
        if (jamesServer != null) {
            jamesServer.shutdown();
        }
    }

    @Test
    public void directResolutionShouldBeWellPerformed() throws Exception {
        InMemoryDNSService inMemoryDNSService = new InMemoryDNSService()
            .registerMxRecord(JAMES_ANOTHER_DOMAIN, fakeSmtp.getContainer().getContainerIp());

        jamesServer = TemporaryJamesServer.builder()
            .withBase(SMTP_ONLY_MODULE)
            .withOverrides(binder -> binder.bind(DNSService.class).toInstance(inMemoryDNSService))
            .withMailetContainer(MailetContainer.builder()
                .putProcessor(CommonProcessors.simpleRoot())
                .putProcessor(CommonProcessors.error())
                .putProcessor(directResolutionTransport())
                .putProcessor(CommonProcessors.bounces()))
            .build(temporaryFolder.newFolder());

        dataProbe = jamesServer.getProbe(DataProbeImpl.class);
        dataProbe.addDomain(DEFAULT_DOMAIN);
        dataProbe.addUser(FROM, PASSWORD);

        messageSender.connect(LOCALHOST_IP, jamesServer.getProbe(SmtpGuiceProbe.class).getSmtpPort())
            .sendMessage(FROM, RECIPIENT);

        awaitAtMostOneMinute
            .untilAsserted(this::assertMessageReceivedByTheSmtpServer);
    }

    @Test
    public void directResolutionShouldFailoverOnSecondMxWhenFirstMxFailed() throws Exception {
        InMemoryDNSService inMemoryDNSService = new InMemoryDNSService()
            .registerRecord(JAMES_ANOTHER_DOMAIN, ADDRESS_EMPTY_LIST, JAMES_ANOTHER_MX_DOMAINS, RECORD_EMPTY_LIST)
            .registerMxRecord(JAMES_ANOTHER_MX_DOMAIN_1, fakeSmtpOnPort26.getContainer().getContainerIp())
            .registerMxRecord(JAMES_ANOTHER_MX_DOMAIN_2, fakeSmtp.getContainer().getContainerIp());

        jamesServer = TemporaryJamesServer.builder()
            .withBase(SMTP_ONLY_MODULE)
            .withOverrides(binder -> binder.bind(DNSService.class).toInstance(inMemoryDNSService))
            .withMailetContainer(MailetContainer.builder()
                .putProcessor(CommonProcessors.simpleRoot())
                .putProcessor(CommonProcessors.error())
                .putProcessor(directResolutionTransport())
                .putProcessor(CommonProcessors.bounces()))
            .build(temporaryFolder.newFolder());

        dataProbe = jamesServer.getProbe(DataProbeImpl.class);
        dataProbe.addDomain(DEFAULT_DOMAIN);
        dataProbe.addUser(FROM, PASSWORD);

        messageSender.connect(LOCALHOST_IP, jamesServer.getProbe(SmtpGuiceProbe.class).getSmtpPort())
            .sendMessage(FROM, RECIPIENT);

        awaitAtMostOneMinute
            .untilAsserted(this::assertMessageReceivedByTheSmtpServer);
    }

    @Test
    public void directResolutionShouldBounceUponUnreachableMxRecords() throws Exception {
        InMemoryDNSService inMemoryDNSService = new InMemoryDNSService()
            .registerRecord(JAMES_ANOTHER_DOMAIN, ADDRESS_EMPTY_LIST, ImmutableList.of("unknown"), RECORD_EMPTY_LIST);

        jamesServer = TemporaryJamesServer.builder()
            .withBase(SMTP_AND_IMAP_MODULE)
            .withOverrides(binder -> binder.bind(DNSService.class).toInstance(inMemoryDNSService))
            .withMailetContainer(MailetContainer.builder()
                .putProcessor(CommonProcessors.simpleRoot())
                .putProcessor(CommonProcessors.error())
                .putProcessor(transport())
                .putProcessor(CommonProcessors.bounces()))
            .build(temporaryFolder.newFolder());

        dataProbe = jamesServer.getProbe(DataProbeImpl.class);
        dataProbe.addDomain(DEFAULT_DOMAIN);
        dataProbe.addUser(FROM, PASSWORD);

        messageSender.connect(LOCALHOST_IP, jamesServer.getProbe(SmtpGuiceProbe.class).getSmtpPort())
            .sendMessage(FROM, RECIPIENT);

        imapMessageReader.connect(LOCALHOST_IP, jamesServer.getProbe(ImapGuiceProbe.class).getImapPort())
            .login(FROM, PASSWORD)
            .select(IMAPMessageReader.INBOX)
            .awaitMessage(awaitAtMostOneMinute);
    }

    @Test
    public void directResolutionShouldBounceWhenNoMxRecord() throws Exception {
        InMemoryDNSService inMemoryDNSService = new InMemoryDNSService()
            .registerRecord(JAMES_ANOTHER_DOMAIN, ADDRESS_EMPTY_LIST, RECORD_EMPTY_LIST, RECORD_EMPTY_LIST);

        jamesServer = TemporaryJamesServer.builder()
            .withBase(SMTP_AND_IMAP_MODULE)
            .withOverrides(binder -> binder.bind(DNSService.class).toInstance(inMemoryDNSService))
            .withMailetContainer(MailetContainer.builder()
                .putProcessor(CommonProcessors.simpleRoot())
                .putProcessor(CommonProcessors.error())
                .putProcessor(transport())
                .putProcessor(CommonProcessors.bounces()))
            .build(temporaryFolder.newFolder());

        dataProbe = jamesServer.getProbe(DataProbeImpl.class);
        dataProbe.addDomain(DEFAULT_DOMAIN);
        dataProbe.addUser(FROM, PASSWORD);

        messageSender.connect(LOCALHOST_IP, jamesServer.getProbe(SmtpGuiceProbe.class).getSmtpPort())
            .sendMessage(FROM, RECIPIENT);

        imapMessageReader.connect(LOCALHOST_IP, jamesServer.getProbe(ImapGuiceProbe.class).getImapPort())
            .login(FROM, PASSWORD)
            .select(IMAPMessageReader.INBOX)
            .awaitMessage(awaitAtMostOneMinute);
    }

    private void assertMessageReceivedByTheSmtpServer() {
        fakeSmtp.assertEmailReceived(response -> response
            .body("", hasSize(1))
            .body("[0].from", equalTo(FROM))
            .body("[0].subject", equalTo("test")));
    }

    private ProcessorConfiguration.Builder directResolutionTransport() {
        return ProcessorConfiguration.transport()
            .addMailet(MailetConfiguration.BCC_STRIPPER)
            .addMailet(MailetConfiguration.remoteDeliveryBuilder()
                .matcher(All.class));
    }

    private ProcessorConfiguration.Builder transport() {
        return ProcessorConfiguration.transport()
            .addMailet(MailetConfiguration.BCC_STRIPPER)
            .addMailet(LOCAL_DELIVERY)
            .addMailet(MailetConfiguration.remoteDeliveryBuilder()
                .matcher(All.class));
    }

}
