server/protocols/webadmin/webadmin-mail-over-web/src/main/java/org/apache/james/webadmin/routes/TransferEmailRoutes.java

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package org.apache.james.webadmin.routes;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.util.UUID;

import jakarta.annotation.PreDestroy;
import jakarta.inject.Inject;
import jakarta.mail.Session;
import jakarta.mail.internet.MimeMessage;

import org.apache.james.queue.api.MailQueue;
import org.apache.james.queue.api.MailQueueFactory;
import org.apache.james.server.core.MailImpl;
import org.apache.james.webadmin.Routes;

import spark.Service;

public class TransferEmailRoutes implements Routes {

    public static final String BASE_URL = "/mail-transfer-service";

    private MailQueue queue;

    @Override
    public String getBasePath() {
        return BASE_URL;
    }

    @Inject
    public TransferEmailRoutes(MailQueueFactory<?> queueFactory) {
        queue = queueFactory.createQueue(MailQueueFactory.SPOOL);
    }

    @PreDestroy
    void tearDown() {
        try {
            queue.close();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    public void define(Service service) {
        defineReceiveMailFromWebService(service);
    }

    public void defineReceiveMailFromWebService(Service service) {
        service.post(BASE_URL, (request, response) -> {
            //parse MimeMessage from request body
            MimeMessage mimeMessage = new MimeMessage(Session.getDefaultInstance(System.getProperties()), new ByteArrayInputStream(request.bodyAsBytes()));
            //create MailImpl object from MimeMessage
            MailImpl mail = MailImpl.fromMimeMessage(UUID.randomUUID().toString(), mimeMessage);
            //Send to queue api for mail processing
            queue.enQueue(mail);
            response.body("");
            response.status(201);

            return response.body();
        });
    }
}