implemented user login.

next: find a solution for routing

core/build.gradle.kts

@@ -0,0 +1,20 @@
+plugins {
+    id("java")
+}
+
+group = "de.srsoftware"
+version = "unspecified"
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    testImplementation(platform("org.junit:junit-bom:5.10.0"))
+    testImplementation("org.junit.jupiter:junit-jupiter")
+    implementation("org.xerial:sqlite-jdbc:3.49.0.0")
+}
+
+tasks.test {
+    useJUnitPlatform()
+}

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

@@ -0,0 +1,12 @@
+/* © SRSoftware 2025 */
+package de.srsoftware.umbrella.core;
+
+import java.util.HashMap;
+
+public class AddableMap extends HashMap<String,Object> {
+	public AddableMap plus(Object...param){
+		if (param.length % 2 == 1) throw new RuntimeException("Expectirg number of parameters to be even");
+		for (int i=0; i<param.length; i+=2) put(param[i].toString(),param[i+1]);
+		return this;
+	}
+}

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

@@ -0,0 +1,28 @@
+/* © SRSoftware 2025 */
+package de.srsoftware.umbrella.core;
+
+import java.io.File;
+import java.sql.Connection;
+import java.sql.SQLException;
+import java.util.HashMap;
+import org.sqlite.SQLiteDataSource;
+
+public class ConnectionProvider extends HashMap<File, Connection> {
+	public Connection get(Object o) {
+		if (o instanceof String filename) o = new File(filename);
+		if (o instanceof File dbFile) try {
+			var conn = super.get(dbFile);
+			if (conn == null) put(dbFile, conn = open(dbFile));
+			return conn;
+		} catch (SQLException sqle) {
+			throw new RuntimeException(sqle);
+		}
+		return null;
+	}
+
+	private Connection open(File dbFile) throws SQLException {
+		SQLiteDataSource dataSource = new SQLiteDataSource();
+		dataSource.setUrl("jdbc:sqlite:%s".formatted(dbFile));
+		return dataSource.getConnection();
+	}
+}

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

@@ -0,0 +1,60 @@
+/* © SRSoftware 2025 */
+package de.srsoftware.umbrella.core;
+
+
+import static java.nio.charset.StandardCharsets.UTF_8;
+
+public class Constants {
+
+	public static final String ADDRESS = "address";
+	public static final String ATTACHMENTS = "attachments";
+	public static final String BODY = "body";
+	public static final String DATA = "data";
+	public static final String DATE = "date";
+	public static final String DEFAULT_LANGUAGE = "en";
+	public static final String DEFAULT_THEME = "winter";
+	public static final String DESCRIPTION = "description";
+	public static final String DOMAIN = "domain";
+	public static final String EMAIL = "email";
+
+	public static final String ERROR_FAILED_CREATE_TABLE = "Failed to create \"{0}\" table!";
+	public static final String ERROR_INVALID_FIELD = "Expected {0} to be {1}!";
+	public static final String ERROR_MISSING_FIELD = "Json is missing {0} field!";
+	public static final String ERROR_READ_TABLE = "Failed to read {0} from {1} table";
+
+	public static final String EXPIRATION = "expiration";
+	public static final String ID = "id";
+	public static final String KEY = "key";
+	public static final String LANGUAGE = "language";
+	public static final String LOGIN = "login";
+	public static final String MESSAGES = "messages";
+	public static final String NAME = "name";
+	public static final String MIME = "mime";
+	public static final String NUMBER = "number";
+	public static final String OPTIONAL = "optional";
+	public static final String PASSWORD = "password";
+
+	public static final String RECEIVERS = "receivers";
+	public static final String REDIRECT = "redirect";
+	public static final String SENDER = "sender";
+	public static final String SETTINGS = "settings";
+	public static final String STATE = "state";
+	public static final String STATUS_CODE = "code";
+	public static final String STRING = "string";
+	public static final String SUBJECT = "subject";
+
+	public static final String TABLE_SETTINGS = "settings";
+
+	public static final String TEMPLATE = "template";
+	public static final String TEXT = "text";
+	public static final String THEME = "theme";
+	public static final String TITLE = "title";
+	public static final String TOKEN = "token";
+	public static final String UMBRELLA = "Umbrella";
+	public static final String URL = "url";
+	public static final String USER = "user";
+	public static final String USER_ID = "user_id";
+	public static final String USER_LIST = "user_list";
+	public static final String UTF8 = UTF_8.displayName();
+	public static final String VALUE = "value";
+}

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

@@ -0,0 +1,19 @@
+/* © SRSoftware 2025 */
+package de.srsoftware.umbrella.core;
+
+public class Paths {
+	private Paths(){};
+
+	public static final String ADD = "add";
+	public static final String CSS = "css";
+	public static final String JSON = "json";
+	public static final String LEGACY = "legacy";
+	public static final String LIST = "list";
+	public static final String LOGOUT = "logout";
+	public static final String SEARCH = "search";
+	public static final String SERVICE = "service";
+	public static final String SETTINGS = "settings";
+	public static final String SUBMIT = "submit";
+	public static final String TOKEN = "token";
+	public static final String VIEW = "view";
+}

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

@@ -0,0 +1,14 @@
+/* © SRSoftware 2025 */
+package de.srsoftware.umbrella.core;
+
+public class ResponseCode {
+	public static final int OK              = 200;
+	public static final int REDIRECT        = 302;
+	public static final int BAD_REQUEST     = 400;
+	public static final int UNAUTHORIZED    = 401;
+	public static final int FORBIDDEN       = 403;
+	public static final int NOT_FOUND       = 404;
+	public static final int UNPROCESSABLE   = 422;
+	public static final int SERVER_ERROR    = 500;
+	public static final int NOT_IMPLEMENTED = 501;
+}

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

@@ -0,0 +1,27 @@
+/* © SRSoftware 2025 */
+package de.srsoftware.umbrella.core;
+
+import static java.text.MessageFormat.format;
+
+
+public class UmbrellaException extends Exception{
+	private final int statusCode;
+
+	public UmbrellaException(int statusCode, String message){
+		super(message);
+		this.statusCode = statusCode;
+	}
+
+	public UmbrellaException(int statusCode, String message, Object ... fills){
+		this(statusCode,format(message,fills));
+	}
+
+	public UmbrellaException causedBy(Exception e) {
+		initCause(e);
+		return this;
+	}
+
+	public int statusCode(){
+		return statusCode;
+	}
+}