preparing for sending documents

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

core/src/main/java/de/srsoftware/umbrella/core/Constants.java

@@ -33,9 +33,12 @@ public class Constants {
 	public static final String ESTIMATED_TIME = "estimated_time";
 
 	public static final String EXPIRATION = "expiration";
+	public static final String FALLBACK_LANG = "de";
 	public static final String GET	          = "GET";
 
 	public static final String ID = "id";
+	public static final String JSONARRAY = "json array";
+	public static final String JSONOBJECT = "json object";
 	public static final String KEY = "key";
 	public static final String LANGUAGE = "language";
 	public static final String LOGIN = "login";

core/src/main/java/de/srsoftware/umbrella/core/api/PostBox.java

@@ -1,5 +1,7 @@
 /* © SRSoftware 2025 */
-package de.srsoftware.umbrella.message.model;
+package de.srsoftware.umbrella.core.api;
+
+import de.srsoftware.umbrella.core.model.Envelope;
 
 public interface PostBox {
 	public void send(Envelope envelope);

core/src/main/java/de/srsoftware/umbrella/core/api/Translator.java

@@ -1,7 +1,6 @@
 /* © SRSoftware 2025 */
 package de.srsoftware.umbrella.core.api;
 
-import java.util.HashMap;
 import java.util.Map;
 import java.util.TreeMap;
 

core/src/main/java/de/srsoftware/umbrella/core/model/Attachment.java

@@ -1,5 +1,5 @@
 /* © SRSoftware 2025 */
-package de.srsoftware.umbrella.message.model;
+package de.srsoftware.umbrella.core.model;
 
 import static de.srsoftware.umbrella.core.Constants.*;
 import static de.srsoftware.umbrella.core.exceptions.UmbrellaException.invalidFieldException;
@@ -16,16 +16,6 @@ public record Attachment(String name, String mime, byte[] content) {
 
 	private static final Base64.Decoder BASE64 = Base64.getDecoder();
 
-	public static <T> Attachment of(JSONObject json) throws UmbrellaException {
-		for (var key : Set.of(NAME, MIME, DATA)) {
-			if (!json.has(key)) throw missingFieldException(key);
-		}
-		if (!(json.get(NAME) instanceof String name)) throw invalidFieldException(NAME,STRING);
-		if (!(json.get(MIME) instanceof String mime)) throw invalidFieldException(MIME,STRING);
-		if (!(json.get(DATA) instanceof String data)) throw invalidFieldException(DATA,STRING);
-		return new Attachment(name,mime, BASE64.decode(data));
-	}
-
 	@Override
 	public boolean equals(Object o) {
 		if (!(o instanceof Attachment that)) return false;
@@ -36,4 +26,14 @@ public record Attachment(String name, String mime, byte[] content) {
 	public int hashCode() {
 		return Objects.hash(name, mime, Arrays.hashCode(content));
 	}
+
+	public static <T> Attachment of(JSONObject json) throws UmbrellaException {
+		for (var key : Set.of(NAME, MIME, DATA)) {
+			if (!json.has(key)) throw missingFieldException(key);
+		}
+		if (!(json.get(NAME) instanceof String name)) throw invalidFieldException(NAME,STRING);
+		if (!(json.get(MIME) instanceof String mime)) throw invalidFieldException(MIME,STRING);
+		if (!(json.get(DATA) instanceof String data)) throw invalidFieldException(DATA,STRING);
+		return new Attachment(name,mime, BASE64.decode(data));
+	}
 }

core/src/main/java/de/srsoftware/umbrella/core/model/Envelope.java

@@ -1,14 +1,12 @@
 /* © SRSoftware 2025 */
-package de.srsoftware.umbrella.message.model;
+package de.srsoftware.umbrella.core.model;
 
+import static de.srsoftware.umbrella.core.Constants.*;
 import static de.srsoftware.umbrella.core.exceptions.UmbrellaException.invalidFieldException;
 import static de.srsoftware.umbrella.core.exceptions.UmbrellaException.missingFieldException;
-import static de.srsoftware.umbrella.message.Constants.*;
 import static java.text.MessageFormat.format;
 
 import de.srsoftware.umbrella.core.exceptions.UmbrellaException;
-import de.srsoftware.umbrella.core.model.EmailAddress;
-import de.srsoftware.umbrella.core.model.UmbrellaUser;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
@@ -18,13 +16,13 @@ import org.json.JSONObject;
 
 public class Envelope {
 	private Message message;
-	private Set<UmbrellaUser> receivers;
+	private Set<User> receivers;
 
-	public Envelope(Message message, UmbrellaUser receiver){
+	public Envelope(Message message, User receiver){
 		this(message,new HashSet<>(Set.of(receiver)));
 	}
 
-	public Envelope(Message message, HashSet<UmbrellaUser> receivers) {
+	public Envelope(Message message, HashSet<User> receivers) {
 		this.message = message;
 		this.receivers = receivers;
 	}
@@ -40,16 +38,16 @@ public class Envelope {
 		var message = Message.from(json);
 		var obj = json.get(RECEIVERS);
 		if (obj instanceof JSONObject) obj = new JSONArray(List.of(obj));
-		if (!(obj instanceof JSONArray receiverList)) throw invalidFieldException(RECEIVERS,JSONARRAY);
+		if (!(obj instanceof JSONArray receiverList)) throw invalidFieldException(RECEIVERS, JSONARRAY);
-		var receivers = new HashSet<UmbrellaUser>();
+		var receivers = new HashSet<User>();
 		for (var o : receiverList){
-			if (!(o instanceof JSONObject receiverData)) throw invalidFieldException("entries of "+RECEIVERS,JSONOBJECT);
+			if (!(o instanceof JSONObject receiverData)) throw invalidFieldException("entries of "+ RECEIVERS, JSONOBJECT);
-			receivers.add(UmbrellaUser.of(receiverData));
+			receivers.add(User.of(receiverData));
 		}
 		return new Envelope(message,receivers);
 	}
 
-	public boolean isFor(UmbrellaUser receiver) {
+	public boolean isFor(User receiver) {
 		return receivers.contains(receiver);
 	}
 
@@ -57,12 +55,12 @@ public class Envelope {
 		return message;
 	}
 
-	public Set<UmbrellaUser> receivers(){
+	public Set<User> receivers(){
 		return receivers;
 	}
 
 	@Override
 	public String toString() {
-		return format("{0} (to: {1}), subject: {2}",getClass().getSimpleName(),receivers.stream().map(UmbrellaUser::email).map(EmailAddress::toString).collect(Collectors.joining(", ")),message.subject());
+		return format("{0} (to: {1}), subject: {2}",getClass().getSimpleName(),receivers.stream().map(User::email).map(EmailAddress::toString).collect(Collectors.joining(", ")),message.subject());
 	}
 }

core/src/main/java/de/srsoftware/umbrella/core/model/Message.java

@@ -1,25 +1,29 @@
 /* © SRSoftware 2025 */
-package de.srsoftware.umbrella.message.model;
+package de.srsoftware.umbrella.core.model;
 
 import static de.srsoftware.tools.Optionals.isSet;
 import static de.srsoftware.umbrella.core.Constants.*;
 import static de.srsoftware.umbrella.core.exceptions.UmbrellaException.invalidFieldException;
 import static de.srsoftware.umbrella.core.exceptions.UmbrellaException.missingFieldException;
-import static de.srsoftware.umbrella.message.Constants.*;
 import static java.text.MessageFormat.format;
 
 import de.srsoftware.umbrella.core.exceptions.UmbrellaException;
-import de.srsoftware.umbrella.core.model.UmbrellaUser;
 import java.util.*;
 import org.json.JSONArray;
 import org.json.JSONObject;
 
 public record Message(UmbrellaUser sender, String subject, String body, Map<String,String> fills, List<Attachment> attachments) {
+	@Override
+	public boolean equals(Object o) {
+		if (!(o instanceof Message message)) return false;
+		return Objects.equals(sender, message.sender) && Objects.equals(subject, message.subject) && Objects.equals(body, message.body) && Objects.equals(attachments, message.attachments);
+	}
+
 	public static Message from(JSONObject json) throws UmbrellaException {
 		for (var key : Set.of(SENDER, SUBJECT, BODY)) {
 			if (!json.has(key)) throw missingFieldException(key);
 		}
-		if (!(json.get(SENDER) instanceof JSONObject senderObject)) throw invalidFieldException(SENDER,JSONOBJECT);
+		if (!(json.get(SENDER) instanceof JSONObject senderObject)) throw invalidFieldException(SENDER, JSONOBJECT);
 		if (!(json.get(SUBJECT) instanceof String subject && isSet(subject))) throw invalidFieldException(SUBJECT,STRING);
 		if (!(json.get(BODY) instanceof String body && isSet(body))) throw invalidFieldException(BODY,STRING);
 
@@ -40,12 +44,6 @@ public record Message(UmbrellaUser sender, String subject, String body, Map<Stri
 		return new Message(sender,subject,body,null, attachments);
 	}
 
-	@Override
-	public boolean equals(Object o) {
-		if (!(o instanceof Message message)) return false;
-		return Objects.equals(sender, message.sender) && Objects.equals(subject, message.subject) && Objects.equals(body, message.body) && Objects.equals(attachments, message.attachments);
-	}
-
 	@Override
 	public int hashCode() {
 		return Objects.hash(subject, body, attachments);

core/src/main/java/de/srsoftware/umbrella/core/model/UmbrellaUser.java

@@ -3,72 +3,43 @@ package de.srsoftware.umbrella.core.model;
 
 
 import static de.srsoftware.umbrella.core.Constants.*;
-import static de.srsoftware.umbrella.core.exceptions.UmbrellaException.missingFieldException;
 
 import de.srsoftware.tools.Mappable;
-import de.srsoftware.umbrella.core.exceptions.UmbrellaException;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Objects;
-import org.json.JSONObject;
 
 /* © SRSoftware 2025 */
-public class UmbrellaUser implements Mappable {
+public class UmbrellaUser extends User implements Mappable {
 
 	private final long id;
-	private final String theme, name, lang;
+	private final String theme;
-	private final EmailAddress email;
 
 	public UmbrellaUser(long id, String name, EmailAddress email, String theme, String languageCode)  {
-		this.email = email;
+		super(name, email, languageCode);
-		this.name = name;
 		this.id = id;
 		this.theme = theme;
-		this.lang = languageCode;
 	}
 
 
-	public EmailAddress email(){
-		return email;
-	}
-
 	@Override
 	public boolean equals(Object o) {
 		if (!(o instanceof UmbrellaUser user)) return false;
-		return Objects.equals(email, user.email)
+		return Objects.equals(email(), user.email())
-				&& Objects.equals(name, user.name)
+				&& Objects.equals(name(), user.name())
 				&& Objects.equals(id, user.id)
-				&& Objects.equals(lang, user.lang);
+				&& Objects.equals(language(), user.language());
 	}
 
 	@Override
 	public int hashCode() {
-		return Objects.hash(email, id, lang, name);
+		return Objects.hash(email(), id, language(), name());
 	}
 
 	public long id(){
 		return id;
 	}
 
-	public String language(){
-		return lang;
-	}
-
-	public String name(){
-		return name;
-	}
-
-	public static UmbrellaUser of(JSONObject json) throws UmbrellaException {
-		if (json.has(USER)) json = json.getJSONObject(USER);
-		if (!json.has(ID)) throw missingFieldException(ID);
-		var id = json.getLong(ID);
-		var name = json.has(NAME) ? json.getString(NAME) : null;
-		var email = json.has(EMAIL) ? new EmailAddress(json.getString(EMAIL)) : null;
-		var theme = json.has(THEME) ? json.getString(THEME) : null;
-		var lang = json.has(LANGUAGE) ? json.getString(LANGUAGE) : null;
-		return new UmbrellaUser(id, name, email, theme, lang);
-	}
-
 	public String theme(){
 		return theme;
 	}
@@ -81,7 +52,7 @@ public class UmbrellaUser implements Mappable {
 		map.put(NAME, name());
 		map.put(EMAIL,email() instanceof EmailAddress ea ? ea.toString() : null);
 		map.put(THEME,theme);
-		map.put(LANGUAGE,lang);
+		map.put(LANGUAGE,language());
 		return map;
 	}
 }

core/src/main/java/de/srsoftware/umbrella/core/model/User.java

@@ -0,0 +1,52 @@
+/* © SRSoftware 2025 */
+package de.srsoftware.umbrella.core.model;
+
+import static de.srsoftware.umbrella.core.Constants.*;
+import static de.srsoftware.umbrella.core.Constants.EMAIL;
+import static de.srsoftware.umbrella.core.Constants.LANGUAGE;
+import static de.srsoftware.umbrella.core.Constants.NAME;
+import static de.srsoftware.umbrella.core.Constants.THEME;
+import static de.srsoftware.umbrella.core.exceptions.UmbrellaException.missingFieldException;
+
+import de.srsoftware.umbrella.core.exceptions.UmbrellaException;
+import org.json.JSONObject;
+
+public class User {
+	private String lang, name;
+	private EmailAddress email;
+
+	public User(String name, EmailAddress email, String languageCode){
+		lang = languageCode;
+		this.name = name;
+		this.email = email;
+	}
+
+	public EmailAddress email(){
+		return email;
+	}
+
+	public String language(){
+		return lang;
+	}
+
+	public String name(){
+		return name;
+	}
+
+	public static User of(JSONObject json) throws UmbrellaException {
+		if (json.has(USER)) json = json.getJSONObject(USER);
+
+		if (!(json.has(NAME) && json.get(NAME) instanceof String name)) throw missingFieldException(NAME);
+		if (!(json.has(EMAIL) && json.get(EMAIL) instanceof String email)) throw missingFieldException(EMAIL);
+		if (!(json.has(LANGUAGE) && json.get(LANGUAGE) instanceof String lang)) throw missingFieldException(LANGUAGE);
+
+		var addr = new EmailAddress(email);
+		if (json.has(ID) && json.get(ID) instanceof Number id) {
+			var theme = json.has(THEME) ? json.getString(THEME) : null;
+			return new UmbrellaUser(id.longValue(), name, addr, theme, lang);
+		}
+		return new User(name,addr,lang);
+
+
+	}
+}

core/src/test/java/TranslatorTest.java

@@ -1,12 +1,12 @@
+/* © SRSoftware 2025 */
+import static java.text.MessageFormat.format;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
 import de.srsoftware.umbrella.core.api.Translator;
+import java.util.Map;
 import org.json.JSONObject;
 import org.junit.jupiter.api.Test;
 
-import java.util.Map;
-
-import static java.text.MessageFormat.format;
-import static org.junit.jupiter.api.Assertions.assertEquals;
-
 public class TranslatorTest {
 
 	private static final Translator translator = new Translator() {

documents/build.gradle.kts

@@ -5,10 +5,10 @@ dependencies{
     implementation(project(":core"))
 
     implementation("de.srsoftware:configuration.json:1.0.3")
-    implementation("de.srsoftware:document.api:1.0.1")
+    implementation("de.srsoftware:document.api:2.0.0")
-    implementation("de.srsoftware:document.file:1.0.0")
+    implementation("de.srsoftware:document.file:1.0.1")
-    implementation("de.srsoftware:document.processor:1.0.2")
+    implementation("de.srsoftware:document.processor:1.0.3")
-    implementation("de.srsoftware:document.zugferd:1.0.3")
+    implementation("de.srsoftware:document.zugferd:1.0.4")
 
     implementation("de.srsoftware:tools.mime:1.1.2")
 }

documents/src/main/java/de/srsoftware/umbrella/documents/DocumentApi.java

@@ -29,7 +29,6 @@ import de.srsoftware.configuration.Configuration;
 import de.srsoftware.document.api.Content;
 import de.srsoftware.document.api.DocumentRegistry;
 import de.srsoftware.document.api.RenderError;
-import de.srsoftware.document.api.RenderResult;
 import de.srsoftware.document.files.DocumentDirectory;
 import de.srsoftware.document.processor.latex.LatexFactory;
 import de.srsoftware.document.processor.weasyprint.WeasyFactory;
@@ -42,12 +41,11 @@ import de.srsoftware.tools.SessionToken;
 import de.srsoftware.tools.Tuple;
 import de.srsoftware.umbrella.core.BaseHandler;
 import de.srsoftware.umbrella.core.api.CompanyService;
+import de.srsoftware.umbrella.core.api.PostBox;
 import de.srsoftware.umbrella.core.api.Translator;
 import de.srsoftware.umbrella.core.api.UserService;
 import de.srsoftware.umbrella.core.exceptions.UmbrellaException;
-import de.srsoftware.umbrella.core.model.Company;
+import de.srsoftware.umbrella.core.model.*;
-import de.srsoftware.umbrella.core.model.Token;
-import de.srsoftware.umbrella.core.model.UmbrellaUser;
 import de.srsoftware.umbrella.documents.model.*;
 import de.srsoftware.umbrella.documents.model.Customer;
 import java.io.File;
@@ -227,7 +225,11 @@ public class DocumentApi extends BaseHandler {
 		if (!(json.has(SUBJECT) && json.get(SUBJECT) instanceof String subject)) throw missingFieldException(SUBJECT);
 		if (!(json.has(CONTENT) && json.get(CONTENT) instanceof String content)) throw missingFieldException(CONTENT);
 
-		postBox.send(…)
+		var attachment = new Attachment(doc.number()+".pdf",rendered.mimeType(),rendered.bytes());
+		var message = new Message(user,subject,content,null,List.of(attachment));
+		var envelope = new Envelope(message,new User(doc.customer().name(),new EmailAddress(email),doc.customer().language()));
+		messages.send(envelope);
+		// TODO postBox.send(…)
 
 		return sendEmptyResponse(HTTP_NOT_IMPLEMENTED,ex);
 	}

documents/src/main/java/de/srsoftware/umbrella/documents/SqliteDb.java

@@ -560,7 +560,7 @@ CREATE TABLE IF NOT EXISTS {0} ( {1} VARCHAR(255) PRIMARY KEY, {2} VARCHAR(255)
 		var customerId = rs.getString(FIELD_CUSTOMER_NUMBER);
 		var customerTaxNumber = rs.getString(FIELD_CUSTOMER_TAX_NUMBER);
 		var customerEmail = rs.getString(FIELD_CUSTOMER_EMAIL);
-		var customer = new Customer(customerId, customerName, customerEmail, customerTaxNumber);
+		var customer = new Customer(customerId, customerName, customerEmail, customerTaxNumber,FALLBACK_LANG);
 		var sender = new Sender(senderName,bankAccount,taxNumber,court);
 		var template = toTemplate(rs);
 		return new Document(id,company,number,type,date, Document.State.of(state).orElse(State.ERROR),template,delivery,head,footer,currency, DEFAULT_THOUSANDS_SEPARATOR,sender,customer,new PositionList());

documents/src/main/java/de/srsoftware/umbrella/documents/TemplateDoc.java

@@ -88,7 +88,7 @@ public abstract class TemplateDoc implements Document {
 				if (MIME_HTML.equals(mimeType())) value = value.replace("\n","<span class=\"break\"></span>\n");
 				source = source.replace("<? "+token+" ?>",value);
 			}
-			return new StringContent(source);
+			return new StringContent(source,content.mimeType());
 		}
 		return precursor;
 	}

documents/src/main/java/de/srsoftware/umbrella/documents/model/Customer.java

@@ -18,13 +18,15 @@ public final class Customer implements Mappable {
 	private String name;
 	private String email;
 	private String taxNumber;
+	private String language;
 	private final Set<String> dirtyFields = new HashSet<>();
 
-	public Customer(String id, String name, String email, String taxNumber) {
+	public Customer(String id, String name, String email, String taxNumber, String language) {
 		this.id = id;
 		this.name = name;
 		this.email = email;
 		this.taxNumber = taxNumber;
+		this.language = language;
 	}
 
 	public void clean() {
@@ -59,6 +61,10 @@ public final class Customer implements Mappable {
 		return !dirtyFields.isEmpty();
 	}
 
+	public String language(){
+		return language;
+	}
+
 	public String name() {
 		return name;
 	}
@@ -68,7 +74,8 @@ public final class Customer implements Mappable {
 		if (!json.has(NAME) || !(json.get(NAME) instanceof String name)) throw missingFieldException(NAME);
 		if (!json.has(EMAIL) || !(json.get(EMAIL) instanceof String email)) throw missingFieldException(EMAIL);
 		if (!json.has(FIELD_TAX_ID) || !(json.get(FIELD_TAX_ID) instanceof String taxId)) throw missingFieldException(FIELD_TAX_ID);
-		return new Customer(id,name,email,taxId);
+		var lang = json.has(LANGUAGE) && json.get(LANGUAGE) instanceof String l ? l : FALLBACK_LANG;
+		return new Customer(id,name,email,taxId,lang);
 	}
 
 	public void patch(JSONObject json) {

documents/src/main/java/de/srsoftware/umbrella/documents/model/CustomerSettings.java

@@ -2,10 +2,9 @@
 package de.srsoftware.umbrella.documents.model;
 
 
-import de.srsoftware.tools.Mappable;
-
 import static de.srsoftware.umbrella.documents.Constants.*;
 
+import de.srsoftware.tools.Mappable;
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.util.Map;

messages/src/main/java/de/srsoftware/umbrella/message/Constants.java

@@ -16,10 +16,7 @@ public class Constants {
 	public static final String FIELD_HOST = "host";
 	public static final String FIELD_PORT = "port";
 	public static final String HOST = "mail.smtp.host";
-	public static final String JSONARRAY = "json array";
-	public static final String JSONOBJECT = "json object";
 	public static final String PORT = "mail.smtp.port";
-	public static final String RECEIVERS = "receivers";
 	public static final String SSL = "mail.smtp.ssl.enable";
 	public static final String SUBMISSION = "submission";
 

messages/src/main/java/de/srsoftware/umbrella/message/MessageSystem.java

@@ -9,12 +9,13 @@ import static de.srsoftware.umbrella.message.Constants.*;
 import static java.lang.System.Logger.Level.*;
 
 import de.srsoftware.configuration.Configuration;
+import de.srsoftware.umbrella.core.api.PostBox;
 import de.srsoftware.umbrella.core.api.Translator;
 import de.srsoftware.umbrella.core.exceptions.UmbrellaException;
+import de.srsoftware.umbrella.core.model.Envelope;
 import de.srsoftware.umbrella.core.model.UmbrellaUser;
+import de.srsoftware.umbrella.core.model.User;
 import de.srsoftware.umbrella.message.model.CombinedMessage;
-import de.srsoftware.umbrella.message.model.Envelope;
-import de.srsoftware.umbrella.message.model.PostBox;
 import jakarta.activation.DataHandler;
 import jakarta.mail.Message;
 import jakarta.mail.MessagingException;
@@ -31,7 +32,7 @@ import java.util.function.BiFunction;
 public class MessageSystem implements PostBox {
 	public static final System.Logger LOG = System.getLogger(MessageSystem.class.getSimpleName());
 	private final Timer timer = new Timer();
-	private record Receiver(UmbrellaUser user, de.srsoftware.umbrella.message.model.Message message){}
+	private record Receiver(User user, de.srsoftware.umbrella.core.model.Message message){}
 
 	private class SubmissionTask extends TimerTask{
 
@@ -99,11 +100,11 @@ public class MessageSystem implements PostBox {
 	private synchronized void processMessages(Integer scheduledHour) {
 		LOG.log(INFO,"Running {0}…",scheduledHour == null ? "instantly" : "scheduled at "+scheduledHour);
 		var queue = new ArrayList<>(this.queue);
-		var dueRecipients = new ArrayList<UmbrellaUser>();
+		var dueRecipients = new ArrayList<User>();
-		List<UmbrellaUser> recipients = queue.stream().map(Envelope::receivers).flatMap(Set::stream).filter(Objects::nonNull).distinct().toList();
+		List<User> recipients = queue.stream().map(Envelope::receivers).flatMap(Set::stream).filter(Objects::nonNull).distinct().toList();
 
 		{ // for known users: get notification preferences, fallback to _immediately_ for unknown users
-			for (UmbrellaUser recv : recipients) {
+			for (User recv : recipients) {
 				if (recv instanceof UmbrellaUser uu) {
 					try {
 						if (!db.getSettings(uu).sendAt(scheduledHour)) continue;
@@ -157,7 +158,7 @@ public class MessageSystem implements PostBox {
 	}
 
 
-	private void send(CombinedMessage message, UmbrellaUser receiver, Date date) throws MessagingException {
+	private void send(CombinedMessage message, User receiver, Date date) throws MessagingException {
 		LOG.log(TRACE,"Sending combined message to {0}…",receiver);
 		session = session();
 		MimeMessage msg = new MimeMessage(session);

messages/src/main/java/de/srsoftware/umbrella/message/model/CombinedMessage.java

@@ -5,6 +5,8 @@ import static java.lang.System.Logger.Level.DEBUG;
 import static java.lang.System.Logger.Level.TRACE;
 import static java.text.MessageFormat.format;
 
+import de.srsoftware.umbrella.core.model.Attachment;
+import de.srsoftware.umbrella.core.model.Message;
 import de.srsoftware.umbrella.core.model.UmbrellaUser;
 import java.util.*;
 import java.util.function.BiFunction;

user/src/main/java/de/srsoftware/umbrella/user/UserModule.java

@@ -30,14 +30,14 @@ import de.srsoftware.configuration.Configuration;
 import de.srsoftware.tools.Path;
 import de.srsoftware.tools.SessionToken;
 import de.srsoftware.umbrella.core.BaseHandler;
+import de.srsoftware.umbrella.core.api.PostBox;
 import de.srsoftware.umbrella.core.api.UserService;
 import de.srsoftware.umbrella.core.exceptions.UmbrellaException;
 import de.srsoftware.umbrella.core.model.EmailAddress;
+import de.srsoftware.umbrella.core.model.Envelope;
+import de.srsoftware.umbrella.core.model.Message;
 import de.srsoftware.umbrella.core.model.Token;
 import de.srsoftware.umbrella.core.model.UmbrellaUser;
-import de.srsoftware.umbrella.message.MessageSystem;
-import de.srsoftware.umbrella.message.model.Envelope;
-import de.srsoftware.umbrella.message.model.Message;
 import de.srsoftware.umbrella.user.api.LoginServiceDb;
 import de.srsoftware.umbrella.user.api.UserDb;
 import de.srsoftware.umbrella.user.model.*;
@@ -74,7 +74,7 @@ public class UserModule extends BaseHandler implements UserService {
 	private final LoginServiceDb logins;
 	private final HashMap<String, State> stateMap = new HashMap<>(); // map from state to OIDC provider name
 	private final HashMap<String,String> tokenMap = new HashMap<>();
-	private final MessageSystem messages;
+	private final PostBox messages;
 
 	static {
 		try {
@@ -84,7 +84,7 @@ public class UserModule extends BaseHandler implements UserService {
 		}
 	}
 
-	public UserModule(Configuration config, MessageSystem messageSystem) throws UmbrellaException {
+	public UserModule(Configuration config, PostBox messageSystem) throws UmbrellaException {
 		var dbFile = config.get(CONFIG_DATABASE).orElseThrow(() -> missingConfigException(CONFIG_DATABASE));
 		// may be splitted in separate db files later
 		logins   = new SqliteDB(connect(dbFile));
@@ -443,6 +443,11 @@ public class UserModule extends BaseHandler implements UserService {
 		}
 	}
 
+	@Override
+	public PostBox postBox() {
+		return messages;
+	}
+
 	private boolean postCreate(HttpExchange ex) throws IOException, UmbrellaException {
 		var optUser = loadUser(ex);
 		if (!(optUser.isPresent() && optUser.get() instanceof DbUser dbUser)) return unauthorized(ex);