preparing message system:

copied model from previous java implementation

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

@@ -2,9 +2,12 @@
 package de.srsoftware.umbrella.user.model;
 
 import static de.srsoftware.tools.Optionals.nullable;
+import static de.srsoftware.umbrella.core.Constants.*;
+import static de.srsoftware.umbrella.core.Constants.LANGUAGE;
 import static java.text.MessageFormat.format;
 
 import java.util.Objects;
+import org.json.JSONObject;
 
 public class User {
 
@@ -37,4 +40,20 @@ public class User {
 	public String toString() {
 		return format("{1}({0})", nullable(name()).orElse(email()),getClass().getSimpleName());
 	}
+
+	public static User of(JSONObject json){
+		if (json.has(USER)) json = json.getJSONObject(USER);
+		var name = json.has(NAME) ? json.getString(NAME) : null;
+		var email = json.has(EMAIL) ? json.getString(EMAIL) : null;
+		if (json.has(ID) && json.has(THEME)) {
+			return new UmbrellaUser(
+					json.getLong(ID),
+					name,
+					email,
+					json.getString(THEME),
+					json.has(LANGUAGE) ? json.getString(LANGUAGE) : null
+			);
+		}
+		return new User(name,email);
+	}
 }