client/src/main/java/envoy/client/ui/controller/LoginScene.java

@@ -1,5 +1,6 @@
 package envoy.client.ui.controller;
 
+import java.time.Instant;
 import java.util.logging.*;
 
 import javafx.fxml.FXML;
@@ -74,16 +75,20 @@ public final class LoginScene implements EventListener {
 
 	@FXML
 	private void loginButtonPressed() {
+		final String user = userTextField.getText(), pass = passwordField.getText(), repeatPass = repeatPasswordField.getText();
 
 		// Prevent registration with unequal passwords
-		if (registration && !passwordField.getText().equals(repeatPasswordField.getText())) {
+		if (registration && !pass.equals(repeatPass)) {
 			new Alert(AlertType.ERROR, "The entered password is unequal to the repeated one").showAndWait();
 			repeatPasswordField.clear();
-		} else if (!Bounds.isValidContactName(userTextField.getText())) {
+		} else if (!Bounds.isValidContactName(user)) {
 			new Alert(AlertType.ERROR, "The entered user name is not valid (" + Bounds.CONTACT_NAME_PATTERN + ")").showAndWait();
 			userTextField.clear();
-		} else Startup.performHandshake(new LoginCredentials(userTextField.getText(), passwordField.getText(), registration, Startup.VERSION,
-				Startup.loadLastSync(userTextField.getText())));
+		} else {
+			Instant lastSync = Startup.loadLastSync(userTextField.getText());
+			Startup.performHandshake(registration ? LoginCredentials.registration(user, pass, Startup.VERSION, lastSync)
+					: LoginCredentials.login(user, pass, Startup.VERSION, lastSync));
+		}
 	}
 
 	@FXML

common/src/main/java/envoy/data/LoginCredentials.java

@@ -7,6 +7,9 @@ import java.time.Instant;
  * Contains a {@link User}'s login / registration information as well as the
  * client version.
  * <p>
+ * If the authentication is performed with a token, the token is stored instead
+ * of the password.
+ * <p>
  * Project: <strong>envoy-common</strong><br>
  * File: <strong>LoginCredentials.java</strong><br>
  * Created: <strong>29.12.2019</strong><br>
@@ -17,35 +20,68 @@ import java.time.Instant;
 public final class LoginCredentials implements Serializable {
 
 	private final String	identifier, password, clientVersion;
-	private final boolean	registration;
+	private final boolean	registration, token;
 	private final Instant	lastSync;
 
 	private static final long serialVersionUID = 3;
 
-	/**
-	 * Initializes login credentials for a handshake.
-	 *
-	 * @param identifier    the identifier of the user
-	 * @param password      the password of the user
-	 * @param registration  signifies that these credentials are used for user
-	 *                      registration instead of user login
-	 * @param clientVersion the version of the client sending these credentials
-	 * @param lastSync      the time stamp of the last synchronization
-	 * @since Envoy Common v0.2-beta
-	 */
-	public LoginCredentials(String identifier, String password, boolean registration, String clientVersion, Instant lastSync) {
+	private LoginCredentials(String identifier, String password, boolean registration, boolean token, String clientVersion, Instant lastSync) {
 		this.identifier		= identifier;
 		this.password		= password;
 		this.registration	= registration;
+		this.token			= token;
 		this.clientVersion	= clientVersion;
 		this.lastSync		= lastSync;
 	}
 
+	/**
+	 * Creates login credentials for a regular login.
+	 *
+	 * @param identifier    the identifier of the user
+	 * @param password      the password of the user
+	 * @param clientVersion the version of the client sending these credentials
+	 * @param lastSync      the timestamp of the last synchronization
+	 * @return the created login credentials
+	 * @since Envoy Common v0.2-beta
+	 */
+	public static LoginCredentials login(String identifier, String password, String clientVersion, Instant lastSync) {
+		return new LoginCredentials(identifier, password, false, false, clientVersion, lastSync);
+	}
+
+	/**
+	 * Creates login credentials for a login with an authentication token.
+	 *
+	 * @param identifier    the identifier of the user
+	 * @param token         the authentication token of the user
+	 * @param clientVersion the version of the client sending these credentials
+	 * @param lastSync      the timestamp of the last synchronization
+	 * @return the created login credentials
+	 * @since Envoy Common v0.2-beta
+	 */
+	public static LoginCredentials loginWithToken(String identifier, String token, String clientVersion, Instant lastSync) {
+		return new LoginCredentials(identifier, token, false, true, clientVersion, lastSync);
+	}
+
+	/**
+	 * Creates login credentials for a registration.
+	 *
+	 * @param identifier    the identifier of the user
+	 * @param password      the password of the user
+	 * @param clientVersion the version of the client sending these credentials
+	 * @param lastSync      the timestamp of the last synchronization
+	 * @return the created login credentials
+	 * @since Envoy Common v0.2-beta
+	 */
+	public static LoginCredentials registration(String identifier, String password, String clientVersion, Instant lastSync) {
+		return new LoginCredentials(identifier, password, true, false, clientVersion, lastSync);
+	}
+
 	@Override
 	public String toString() {
-		return String.format("LoginCredentials[identifier=%s,registration=%b,clientVersion=%s,lastSync=%s]",
+		return String.format("LoginCredentials[identifier=%s,registration=%b,token=%b,clientVersion=%s,lastSync=%s]",
 				identifier,
 				registration,
+				token,
 				clientVersion,
 				lastSync);
 	}
@@ -69,6 +105,13 @@ public final class LoginCredentials implements Serializable {
 	 */
 	public boolean isRegistration() { return registration; }
 
+	/**
+	 * @return {@code true} if these credentials use an authentication token instead
+	 *         of a password
+	 * @since Envoy Common v0.2-beta
+	 */
+	public boolean usesToken() { return token; }
+
 	/**
 	 * @return the version of the client sending these credentials
 	 * @since Envoy Common v0.1-beta

server/src/main/java/envoy/server/data/User.java

@@ -65,6 +65,12 @@ public final class User extends Contact {
 	@Column(name = "password_hash")
 	private String passwordHash;
 
+	@Column(name = "auth_token")
+	private String authToken;
+
+	@Column(name = "auth_token_expiration")
+	private Instant authTokenExpiration;
+
 	@Column(name = "last_seen")
 	private Instant lastSeen;
 
@@ -90,6 +96,31 @@ public final class User extends Contact {
 	 */
 	public void setPasswordHash(String passwordHash) { this.passwordHash = passwordHash; }
 
+	/**
+	 * @return the authentication token
+	 * @since Envoy Server v0.2-beta
+	 */
+	public String getAuthToken() { return authToken; }
+
+	/**
+	 * @param authToken the authentication token to set
+	 * @since Envoy Server v0.2-beta
+	 */
+	public void setAuthToken(String authToken) { this.authToken = authToken; }
+
+	/**
+	 * @return the time at which the authentication token expires
+	 * @since Envoy Server v0.2-beta
+	 */
+	public Instant getAuthTokenExpiration() { return authTokenExpiration; }
+
+	/**
+	 * @param authTokenExpiration the authentication token expiration timestamp to
+	 *                            set
+	 * @since Envoy Server v0.2-beta
+	 */
+	public void setAuthTokenExpiration(Instant authTokenExpiration) { this.authTokenExpiration = authTokenExpiration; }
+
 	/**
 	 * @return the last date the user has been online
 	 * @since Envoy Server Standalone v0.2-beta