restructuring, working on password reset email

next steps:
- create reset url and add it to the translation fill map
- implement message translation
- implement otp validation and login

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

@@ -36,6 +36,7 @@ public class Constants {
 	public static final String MIME = "mime";
 	public static final String NUMBER = "number";
 	public static final String OPTIONAL = "optional";
+	public static final String PASS = "pass";
 	public static final String PASSWORD = "password";
 	public static final String POST             = "POST";
 

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

@@ -0,0 +1,20 @@
+/* © SRSoftware 2025 */
+package de.srsoftware.umbrella.core.model;
+
+import static de.srsoftware.tools.Optionals.allSet;
+import static java.text.MessageFormat.format;
+
+public class EmailAddress {
+	private final String email;
+
+	public EmailAddress(String addr){
+		var parts = addr.split("@");
+		if (parts.length != 2 || !allSet(parts[0],parts[1])) throw new IllegalArgumentException(format("{0} is not a valid email address!",addr));
+		email = addr;
+	}
+
+	@Override
+	public String toString() {
+		return email;
+	}
+}

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

@@ -0,0 +1,87 @@
+/* © SRSoftware 2025 */
+package de.srsoftware.umbrella.core.model;
+
+
+import static de.srsoftware.umbrella.core.Constants.*;
+import static java.net.HttpURLConnection.HTTP_BAD_REQUEST;
+
+import de.srsoftware.tools.Mappable;
+import de.srsoftware.umbrella.core.UmbrellaException;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Objects;
+import org.json.JSONObject;
+
+/* © SRSoftware 2025 */
+public class UmbrellaUser implements Mappable {
+
+	private final long id;
+	private final String theme, name, lang;
+	private final EmailAddress email;
+
+	public UmbrellaUser(long id, String name, EmailAddress email, String theme, String languageCode)  {
+		this.email = email;
+		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)
+				&& Objects.equals(name, user.name)
+				&& Objects.equals(id, user.id)
+				&& Objects.equals(lang, user.lang);
+	}
+
+	@Override
+	public int hashCode() {
+		return Objects.hash(email, id, lang, 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 new UmbrellaException(HTTP_BAD_REQUEST,ERROR_MISSING_FIELD,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;
+	}
+
+	@Override
+	public Map<String,Object> toMap() {
+		var map = new HashMap<String,Object>();
+		map.put(ID,id);
+		map.put(LOGIN, name()); // this is still used by old umbrella modules
+		map.put(NAME, name());
+		map.put(EMAIL,email().toString());
+		map.put(THEME,theme);
+		map.put(LANGUAGE,lang);
+		return map;
+	}
+}