documentation for all major modules

Also added tasks to run the server & client separately

ChatApp/.gitignore

@@ -1,3 +1,8 @@
 .vscode
 bin
-lib
+lib
+# Ignore Gradle project-specific cache directory
+.gradle
+
+# Ignore Gradle build output directory
+build

ChatApp/README.md

@@ -3,15 +3,56 @@ An instant messaging app using Java and the UDP protocol.
 
 ## How to run
 
-> [!WARNING]
+### Console
-> As of now, the app rely on ANSI escape character, thus not available on Windows.
-> However, this feature is under development.
 
-You can run the app by launching the `ChatApp` class. This will create the server (port `6665`) and a first client,
+#### Server + Client
-(creating by the way a room (`101`)).
 
-You can then create more clients by launching the `Client` class. It will connect to the server 
+You can create a server and an "admin" client by using:
-(be sure you launched it first) on the default port `6665`.
+
+```shell
+./gradlew admin # Linux
+.\gradlew.bat admin # Windows
+```
+
+You will receive the notifications of the server (handshakes, ...).
+
+#### Server
+
+You can create a server by launching:
+
+```shell
+./gradlew server # Linux
+.\gradlew server # Windows
+```
+
+If you want to create a server on a specific port, you can use:
+
+```shell
+./gradlew server --args="port" # Linux
+.\gradlew server --args="port" # Windows
+```
+
+where `port` is the port you want to use.
+
+This will create the server on a random port available and indicate it through the terminal.
+
+To launch the server on a particular port, simply use:
+
+```shell
+./gradlew server --args="port" # Linux
+.\gradlew server --args="port" # Windows
+```
+
+where `port` is the port you want to use.
+
+#### Client
+
+To create a client, you may use: 
+
+```shell
+./gradlew client # Linux
+.\gradlew client # Windows
+```
 
 ## How to use
 As soon as you launch a client, you will be prompted to enter your name. You will then be in the lobby. From here you 
@@ -29,4 +70,13 @@ You will also be able to create a new room.
 - /listRooms
 - /joinRoom *roomName*
 - /leaveRoom
-- /help
+- /room
+- /bye
+- /help
+
+> [!NOTE]
+> There are some aliases for the commands:
+> - /create
+> - /list
+> - /join
+> - /leave

ChatApp/app/build.gradle

@@ -0,0 +1,62 @@
+/*
+ * This file was generated by the Gradle 'init' task.
+ *
+ * This generated file contains a sample Java application project to get you started.
+ * For more details on building Java & JVM projects, please refer to https://docs.gradle.org/8.13/userguide/building_java_projects.html in the Gradle documentation.
+ */
+
+plugins {
+    // Apply the application plugin to add support for building a CLI application in Java.
+    id 'application'
+    id 'org.openjfx.javafxplugin' version '0.1.0'
+}
+
+repositories {
+    // Use Maven Central for resolving dependencies.
+    mavenCentral()
+}
+
+dependencies {
+    // Use JUnit Jupiter for testing.
+    testImplementation libs.junit.jupiter
+
+    testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
+
+    // This dependency is used by the application.
+    implementation libs.guava
+}
+
+// Apply a specific Java toolchain to ease working on different environments.
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(21)
+    }
+}
+
+javafx {
+    modules = [ 'javafx.graphics', 'javafx.controls', 'javafx.fxml' ]
+}
+
+application {
+    // Define the main class for the application.
+    if (project.hasProperty('admin')) {
+        mainClass = 'ChatApp'
+    } else if (project.hasProperty('server')) {
+        mainClass = 'ChatAppServer'
+    } else if (project.hasProperty('client')) {
+        mainClass = 'ChatAppClient'
+    } else if (project.hasProperty('serverGui')) {
+        mainClass = 'server.ServerGui'
+    } else {
+        mainClass = 'client.ClientGui'
+    }
+}
+
+run {
+    standardInput = System.in
+}
+
+tasks.named('test') {
+    // Use JUnit Platform for unit tests.
+    useJUnitPlatform()
+}

ChatApp/app/src/main/java/ChatApp.java

@@ -0,0 +1,23 @@
+import java.net.InetSocketAddress;
+
+import client.ClientConsole;
+import server.Server;
+
+public class ChatApp {
+    public static void main(String[] args) throws Exception {
+        Server server = new Server(6665);
+        ClientConsole client = new ClientConsole(new InetSocketAddress("localhost", 6665));
+
+        client.onConnect.connect((arg) -> {
+            client.getClientInterface().SendCreateRoom("101");
+        });
+
+        client.onDisconnect.connect((arg) -> {
+            System.out.println("Stopping server ...");
+    
+            server.close();
+    
+            System.out.println("Done !");
+        });
+    }
+}

ChatApp/app/src/main/java/ChatAppClient.java

@@ -0,0 +1,15 @@
+import client.ClientConsole;
+
+import java.net.InetSocketAddress;
+
+public class ChatAppClient {
+    public static void main(String[] args) {
+        ClientConsole console = new ClientConsole(new InetSocketAddress("localhost", 6665));
+        try {
+            console.joinThread();
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+        System.out.println("End !");
+    }
+}

ChatApp/app/src/main/java/ChatAppServer.java

@@ -0,0 +1,15 @@
+import java.net.SocketException;
+
+import server.Server;
+
+public class ChatAppServer {
+	public static void main(String[] args) {
+		// run ./gradlew server --args="port" to launch the server with a specific port
+		try {
+			Server server = new Server(args.length > 0 ? Integer.parseInt(args[0]) : 0);
+			System.out.println("Server running on port " + server.getRunningPort() + "!");
+		} catch (SocketException e) {
+			e.printStackTrace();
+		}
+	}
+}

ChatApp/app/src/main/java/client/Client.java

@@ -0,0 +1,58 @@
+package client;
+
+import java.net.InetSocketAddress;
+import java.net.SocketException;
+
+import network.Socket;
+import network.protocol.packets.*;
+
+public class Client {
+
+	private final ClientConnexion connexion;
+	private ClientListener callback;
+
+	public Client(InetSocketAddress serverAddress, ClientListener callback, String pseudo) throws SocketException {
+		this.connexion = new ClientConnexion(new Socket(), serverAddress, callback);
+		this.callback = callback;
+		login(pseudo);
+	}
+
+	private void login(String pseudo) {
+		this.connexion.sendPacket(new LoginPacket(pseudo));
+	}
+
+	public void close() {
+		this.connexion.sendPacket(new DisconnectPacket("Leaving"));
+		this.connexion.close();
+		this.callback.handleDisconnect();
+	}
+
+	public void SendChatMessage(String message) {
+		this.connexion.sendPacket(new SendChatMessagePacket(message));
+	}
+
+	public void SendCreateRoom(String roomName) {
+		this.connexion.sendPacket(new CreateRoomPacket(roomName));
+	}
+
+	public void SendJoinRoom(String roomName) {
+		this.connexion.sendPacket(new JoinRoomPacket(roomName));
+	}
+
+	public void SendLeaveRoom() {
+		this.connexion.sendPacket(new LeaveRoomPacket());
+	}
+
+	public void RequestRoomList() {
+		this.connexion.sendPacket(new RequestRoomListPacket());
+	}
+
+	public void RequestActualRoom() {
+		this.connexion.sendPacket(new RequestActualRoomPacket());
+	}
+
+	public void changeCallback(ClientListener callback) {
+		this.callback = callback;
+		this.connexion.changeCallback(callback);
+	}
+}

ChatApp/app/src/main/java/client/ClientConnexion.java

@@ -0,0 +1,117 @@
+package client;
+
+import java.io.IOException;
+import java.net.InetSocketAddress;
+
+import network.PacketHandler;
+import network.Socket;
+import network.protocol.Packet;
+import network.protocol.PacketVisitor;
+import network.protocol.packets.*;
+import network.protocol.packets.ServerResponsePacket.Response;
+
+public class ClientConnexion implements PacketVisitor, PacketHandler {
+
+	private final InetSocketAddress serverAddress;
+	private final Socket socket;
+	private ClientListener callback;
+
+	public ClientConnexion(Socket socket, InetSocketAddress serverAddress, ClientListener callback) {
+		this.serverAddress = serverAddress;
+		this.socket = socket;
+		this.callback = callback;
+		this.socket.onClose.connect((args) -> onSocketClose());
+		this.socket.addHandler(this);
+	}
+
+	private void onSocketClose() {
+		this.callback.handleConnexionError();
+	}
+
+	public void close() {
+		this.socket.close();
+	}
+
+	public void sendPacket(Packet packet) {
+		try {
+			this.socket.sendPacket(packet, serverAddress);
+		} catch (IOException e) {
+			this.close();
+			this.callback.handleConnexionError();
+			e.printStackTrace();
+		}
+	}
+
+	@Override
+	public void handlePacket(Packet packet, InetSocketAddress address) {
+		// we assume that the packet comes from the server
+		visit(packet);
+	}
+
+	@Override
+	public void visitPacket(ChatMessagePacket packet) {
+		this.callback.handleChatMessage(packet.getTime(), packet.getChatter(), packet.getContent());
+	}
+
+	@Override
+	public void visitPacket(RoomListPacket packet) {
+		this.callback.handleRoomList(packet.getRoomNames());
+	}
+
+	@Override
+	public void visitPacket(ServerResponsePacket packet) {
+		this.callback.handleServerResponse(packet.getResponse());
+		if (packet.getResponse() == Response.AuthSuccess)
+			this.callback.handleConnect();
+	}
+
+	@Override
+	public void visitPacket(ActualRoomPacket packet) {
+		this.callback.handleActualRoom(packet.getRoomName());
+	}
+
+	@Override
+	public void visitPacket(DisconnectPacket packet) {
+		this.close();
+		this.callback.handleDisconnect();
+	}
+
+	public void changeCallback(ClientListener callback) {
+		this.callback = callback;
+	}
+
+	@Override
+	public void visitPacket(RequestActualRoomPacket packet) {
+		throw new UnsupportedOperationException("Unimplemented method 'visitPacket'");
+	}
+
+	@Override
+	public void visitPacket(CreateRoomPacket packet) {
+		throw new UnsupportedOperationException("Unimplemented method 'visitPacket'");
+	}
+
+	@Override
+	public void visitPacket(JoinRoomPacket packet) {
+		throw new UnsupportedOperationException("Unimplemented method 'visitPacket'");
+	}
+
+	@Override
+	public void visitPacket(LeaveRoomPacket packet) {
+		throw new UnsupportedOperationException("Unimplemented method 'visitPacket'");
+	}
+
+	@Override
+	public void visitPacket(LoginPacket packet) {
+		throw new UnsupportedOperationException("Unimplemented method 'visitPacket'");
+	}
+
+	@Override
+	public void visitPacket(RequestRoomListPacket packet) {
+		throw new UnsupportedOperationException("Unimplemented method 'visitPacket'");
+	}
+
+	@Override
+	public void visitPacket(SendChatMessagePacket packet) {
+		throw new UnsupportedOperationException("Unimplemented method 'visitPacket'");
+	}
+}

ChatApp/app/src/main/java/client/ClientConsole.java

@@ -0,0 +1,187 @@
+package client;
+
+import java.net.InetSocketAddress;
+import java.net.SocketException;
+import java.time.Instant;
+import java.util.List;
+import java.util.Map;
+import java.util.Scanner;
+import java.util.function.Consumer;
+
+import network.protocol.ANSIColor;
+import network.protocol.packets.ServerResponsePacket;
+import network.protocol.packets.ServerResponsePacket.Response;
+import utilities.Signal;
+
+public class ClientConsole implements ClientListener {
+
+	private Client client;
+	private final Thread inputThread;
+	private final Scanner scanner;
+
+	public final Signal onConnect = new Signal();
+	public final Signal onDisconnect = new Signal();
+
+	public ClientConsole(InetSocketAddress address) {
+		this.inputThread = new Thread(this::inputLoop);
+		this.scanner = new Scanner(System.in);
+		String pseudo = inputPseudo();
+		try {
+			this.client = new Client(address, this, pseudo);
+			this.inputThread.start();
+		} catch (SocketException e) {
+			e.printStackTrace();
+		}
+	}
+
+	private String inputPseudo() {
+		System.out.println("Enter your pseudo:");
+		String pseudo = "chatter";
+		pseudo = this.scanner.nextLine();
+		return pseudo;
+	}
+
+	public Client getClientInterface() {
+		return this.client;
+	}
+
+	private void inputLoop() {
+		while (!Thread.interrupted()) {
+			String message = this.scanner.nextLine();
+			if (Thread.interrupted())
+				break;
+			visitMessage(message);
+		}
+	}
+
+	public void joinThread() throws InterruptedException {
+		this.inputThread.join();
+	}
+
+	private void printHelp(Map<List<String>, Consumer<String>> commands) {
+		System.out.println("Available commands:");
+		for (var entry : commands.entrySet()) {
+			List<String> commandNames = entry.getKey();
+			System.out.println("\t" + commandNames.get(0) + (commandNames.size() == 2 ? " or " + commandNames.get(1) : ""));
+		}
+		// the clearLine eats the last line if a new line is not skipped
+		System.out.println("\n");
+	}
+
+	private void visitMessage(String message) {
+		if (!message.startsWith("/")) {
+			this.client.SendChatMessage(message);
+			clearLine();
+			return;
+		}
+
+		final Map<List<String>, Consumer<String>> commands = Map.of(
+				List.of("/createRoom <roomName>", "/create <roomName>"), (args) -> this.client.SendCreateRoom(args),
+				List.of("/listRooms", "/list"), (args) -> this.client.RequestRoomList(),
+				List.of("/joinRoom <roomName>", "/join <roomName>"), (args) -> this.client.SendJoinRoom(args),
+				List.of("/leaveRoom", "/leave"), (args) -> this.client.SendLeaveRoom(),
+				List.of("/actualRoom", "/room"), (args) -> this.client.RequestActualRoom(),
+				List.of("/goodbye", "/bye"), (args) -> this.client.close(),
+				List.of("/help"), (args) -> {});
+
+		boolean commandFound = false;
+
+		for (var entry : commands.entrySet()) {
+			List<String> commandNames = entry.getKey();
+			Consumer<String> runnable = entry.getValue();
+			for (String cmd : commandNames) {
+				String[] cmdParts = cmd.split(" ");
+				if (cmdParts.length > 1) {
+					// the command expects arguments
+					if (message.startsWith(cmdParts[0] + " ")) {
+						runnable.accept(message.substring(cmdParts[0].length() + 1).trim());
+						commandFound = true;
+					}
+				} else {
+					// the command does not expect arguments
+					if (message.equals(cmd)) {
+						runnable.accept(message.substring(cmd.length()).trim());
+						commandFound = true;
+					}
+				}
+			}
+			if (commandFound)
+				break;
+		}
+
+		if (commandFound) {
+			if (message.equals("/help"))
+				printHelp(commands);
+			clearLine();
+			return;
+		}
+
+		System.out.println(ANSIColor.formatString("&rUnknown command&n"));
+		printHelp(commands);
+		clearLine();
+	}
+
+	private void clearLine() {
+		System.out.print("\033[1A\r\033[2K"); // weird sequence to clear the line (but it works !)
+		System.out.flush();
+	}
+
+	private void stop() {
+		this.inputThread.interrupt();
+	}
+
+	@Override
+	public void handleDisconnect() {
+		System.out.println("Disconnected !");
+		stop();
+		this.onDisconnect.emit();
+	}
+
+	@Override
+	public void handleConnexionError() {
+		System.out.println("An error occured during the connexion !");
+		stop();
+	}
+
+	@Override
+	public void handleChatMessage(Instant time, String chatter, String content) {
+		StringBuilder sb = new StringBuilder();
+		String strTime = time.toString();
+		sb.append("&y[")
+				.append(strTime, 11, 19) // We only take the HH:MM:SS part
+				.append("]&n")
+				.append(" ")
+				.append(chatter)
+				.append(" : ")
+				.append(content).append("&n"); // make the color back to normal at the end of every message
+		System.out.println(ANSIColor.formatString(sb.toString()));
+	}
+
+	@Override
+	public void handleRoomList(List<String> roomNames) {
+		System.out.println(roomNames.isEmpty()
+				? "No rooms available"
+				: "Rooms : \n\t" + String.join("\n\t", roomNames));
+	}
+
+	@Override
+	public void handleActualRoom(String roomName) {
+		System.out.println(roomName != null ? ANSIColor.formatString("You are now in room &b" + roomName + "&n") : "You are not in a room");
+	}
+
+	@Override
+	public void handleServerResponse(Response response) {
+		if (response == ServerResponsePacket.Response.MessageSent
+				|| response == ServerResponsePacket.Response.MessageNotSent) {
+			return;
+		}
+		System.out.println(response);
+	}
+
+	@Override
+	public void handleConnect() {
+		System.out.println("Connected to server !");
+		this.onConnect.emit();
+	}
+
+}

ChatApp/app/src/main/java/client/ClientGui.java

@@ -0,0 +1,36 @@
+package client;
+
+import javafx.application.Application;
+import javafx.fxml.FXMLLoader;
+import javafx.scene.Scene;
+import javafx.scene.image.Image;
+import javafx.stage.Screen;
+import javafx.stage.Stage;
+
+import java.util.Objects;
+
+public class ClientGui extends Application {
+	public static void main(String[] args) {
+		launch(args);
+	}
+
+	@Override
+	public void start(Stage stage) throws Exception {
+		FXMLLoader loader = new FXMLLoader(getClass().getResource("/client/clientLogin.fxml"));
+		Scene scene = new Scene(loader.load(), 400, 240);
+
+		double screenWidth = Screen.getPrimary().getVisualBounds().getWidth();
+		double screenHeight = Screen.getPrimary().getVisualBounds().getHeight();
+
+		double xPos = screenWidth / 2 - scene.getWidth() / 2;
+		double yPos = screenHeight / 2 - scene.getHeight() / 2;
+
+		scene.getStylesheets().add(getClass().getResource("clientStyle.css").toExternalForm());
+		stage.getIcons().add(new Image(Objects.requireNonNull(getClass().getResourceAsStream("/liscord.png"))));
+		stage.setTitle("Liscord");
+		stage.setScene(scene);
+		stage.setX(xPos);
+		stage.setY(yPos);
+		stage.show();
+	}
+}

ChatApp/app/src/main/java/client/ClientGuiController.java

@@ -0,0 +1,253 @@
+package client;
+
+import javafx.application.Platform;
+import javafx.fxml.FXML;
+import javafx.scene.control.*;
+import javafx.scene.layout.*;
+import javafx.scene.text.Text;
+import javafx.scene.text.TextFlow;
+import javafx.stage.Stage;
+import network.protocol.packets.ServerResponsePacket;
+
+import java.net.InetSocketAddress;
+import java.net.SocketException;
+import java.time.Instant;
+import java.time.ZoneId;
+import java.time.format.DateTimeFormatter;
+import java.util.List;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class ClientGuiController implements ClientListener {
+
+    private Client client;
+
+    private boolean connected = true;
+
+    @FXML
+    private BorderPane vueContainer;
+
+    @FXML
+    private VBox roomList;
+
+    @FXML
+    private VBox chatList;
+
+    @FXML
+    private HBox chatInput;
+
+    @FXML
+    private ScrollPane chatPane;
+
+    public void setClient(Client client) {
+        this.client = client;
+    }
+
+    @FXML
+    public void initialize() throws SocketException {
+        client = new Client(new InetSocketAddress("localhost", 6665), this, UsernameSingleton.getInstance().getUsername());
+        Platform.runLater(() -> {
+            Stage stage = (Stage) vueContainer.getScene().getWindow();
+            stage.setResizable(true); // Fixed a bug that made the close button disappear under my Wayland setup (don't know if it's the same for x11)
+            stage.setOnCloseRequest(event -> {
+                connected = false;
+                client.close();
+            });
+            chatList.heightProperty().addListener((obs, oldVal, newVal) -> chatPane.setVvalue(1.0));
+        });
+    }
+
+    @Override
+    public void handleDisconnect() {
+        System.out.println("Disconnected");
+    }
+
+    /**
+     * Create an alert dialog when the connection to the server fails.
+     */
+    @Override
+    public void handleConnexionError() {
+        if(connected) {
+            Platform.runLater(() -> {
+                Alert alert = new Alert(Alert.AlertType.ERROR);
+                alert.setTitle("Connection");
+                alert.setHeaderText("Connection failed");
+                Optional<ButtonType> res =  alert.showAndWait();
+                if (res.isPresent() && res.get() == ButtonType.OK) {
+                    ((Stage) vueContainer.getScene().getWindow()).close();
+                }
+            });
+        }
+    }
+
+    /**
+     * Create an alert dialog when the connection to the server is successful.
+     */
+    @Override
+    public void handleConnect() {
+        Platform.runLater(() -> {
+            Alert alert = new Alert(Alert.AlertType.INFORMATION);
+            alert.setTitle("Connection");
+            alert.setHeaderText("Connection to the server successful");
+            alert.showAndWait();
+        });
+    }
+
+    /**
+     * Format and insert the received chat message into the chat list.
+     * @param time the time the message was sent
+     * @param chatter the name of the person who sent the message
+     * @param content the content of the message
+     */
+    @Override
+    public void handleChatMessage(Instant time, String chatter, String content) {
+        String untagged = untag(content);
+        String messageColor = Objects.equals(content, untagged) ? "lightblue" : "lightgreen";
+        Platform.runLater(() -> {
+            DateTimeFormatter formatter = DateTimeFormatter.ofPattern("HH:mm")
+                    .withZone(ZoneId.systemDefault());
+            String timeString = formatter.format(time);
+            Text chatterText = new Text(chatter + ": ");
+            chatterText.setStyle("-fx-fill: black; -fx-font-weight: bold;");
+            TextFlow messageText = formatMessage(chatter, untagged);
+            TextFlow wholeMessage = new TextFlow(chatterText, messageText);
+            Text timeText = new Text("  " + timeString);
+            timeText.setStyle("-fx-fill: gray; -fx-font-size: 10px;");
+            HBox messageContainer = new HBox(5, wholeMessage, timeText);
+            messageContainer.setStyle("-fx-background-color: " + messageColor + "; -fx-padding: 8; -fx-background-radius: 5;");
+            messageContainer.setMaxWidth(Double.MAX_VALUE);
+            HBox.setHgrow(messageText, Priority.ALWAYS);
+            chatList.getChildren().add(messageContainer);
+        });
+    }
+
+    /**
+     * Remove the tag from the message (handle ANSI characters encoded by the server)
+     * @param message the message to untag
+     * @return the untagged message
+     */
+    public String untag(String message) {
+        Pattern pattern = Pattern.compile("\u001B\\[44;30m(.*?)\u001B\\[49;39m");
+        Matcher matcher = pattern.matcher(message);
+
+        StringBuffer result = new StringBuffer();
+        while (matcher.find()) {
+            String taggedName = matcher.group(1);
+            matcher.appendReplacement(result, taggedName);
+        }
+        matcher.appendTail(result);
+
+        return result.toString();
+    }
+
+    /**
+     * Display the list of rooms in the room list.
+     * @param roomNames the list of room names
+     */
+    @Override
+    public void handleRoomList(List<String> roomNames) {
+        Platform.runLater(() -> {
+            roomList.getChildren().clear();
+            for (String roomName : roomNames) {
+                Button button = new Button(roomName);
+                button.setOnAction(event -> {
+                    client.SendJoinRoom(roomName);
+                    createChatEnv(roomName);
+                });
+                roomList.getChildren().add(button);
+            }
+        });
+    }
+
+    /**
+     * Create the chat (message wall + input) environment.
+     * @param roomName the name of the room
+     */
+    private void createChatEnv(String roomName) {
+        Platform.runLater(() -> {
+            chatList.getChildren().clear();
+            chatInput.getChildren().clear();
+            Button leaveButton = new Button("Leave room");
+            leaveButton.setOnAction(event -> {
+                client.SendLeaveRoom();
+                chatList.getChildren().clear();
+                chatInput.getChildren().clear();
+            });
+            chatList.getChildren().add(leaveButton);
+
+            TextField messageInput = new TextField();
+            messageInput.setPromptText("Type a message...");
+            messageInput.getStyleClass().add("message-input");
+            HBox.setHgrow(messageInput, Priority.ALWAYS);
+            messageInput.onActionProperty().set(event -> {
+                client.SendChatMessage(messageInput.getText());
+                messageInput.clear();
+            });
+            chatInput.getChildren().add(messageInput);
+
+            Button sendButton = new Button("Send");
+            sendButton.getStyleClass().add("send-button");
+            sendButton.setOnAction(event -> {
+                client.SendChatMessage(messageInput.getText());
+                messageInput.clear();
+            });
+            chatInput.getChildren().add(sendButton);
+        });
+    }
+
+    /**
+     * Colorize the message according to the color codes.
+     * @param chatter the name of the person who sent the message
+     * @param content the content of the message
+     * @return the formatted message
+     */
+    private TextFlow formatMessage(String chatter, String content) {
+        TextFlow textFlow = new TextFlow();
+        // Evil regex : match every sequence starting with a color code ending with the next color code
+        Pattern pattern = Pattern.compile("&([rbgyn])([^&]*)");
+        Matcher matcher = pattern.matcher(content);
+        int lastIndex = 0;
+
+        while (matcher.find()) {
+            if (matcher.start() > lastIndex) {
+                textFlow.getChildren().add(new Text(content.substring(lastIndex, matcher.start())));
+            }
+
+            String colorCode = matcher.group(1);
+            String textPart = matcher.group(2);
+
+            String color = switch (colorCode) {
+                case "r" -> "red";
+                case "b" -> "blue";
+                case "g" -> "green";
+                case "y" -> "gray";
+                default -> "black";
+            };
+
+            Text coloredText = new Text(textPart);
+            coloredText.setStyle("-fx-fill: " + color + ";");
+            textFlow.getChildren().add(coloredText);
+
+            lastIndex = matcher.end();
+        }
+
+        // Add the remaining text (works if there's no color code at all)
+        if (lastIndex < content.length()) {
+            textFlow.getChildren().add(new Text(content.substring(lastIndex)));
+        }
+
+        return textFlow;
+    }
+
+    @Override
+    public void handleServerResponse(ServerResponsePacket.Response response) {
+
+    }
+
+    @Override
+    public void handleActualRoom(String roomName) {
+
+    }
+}

ChatApp/app/src/main/java/client/ClientListener.java

@@ -0,0 +1,18 @@
+package client;
+
+import java.time.Instant;
+import java.util.List;
+
+import network.protocol.packets.ServerResponsePacket;
+
+public interface ClientListener {
+
+	void handleDisconnect();
+	void handleConnexionError();
+	void handleConnect();
+	void handleChatMessage(Instant time, String chatter, String content);
+	void handleRoomList(List<String> roomNames);
+	void handleServerResponse(ServerResponsePacket.Response response);
+	void handleActualRoom(String roomName);
+	
+}

ChatApp/app/src/main/java/client/ClientLoading.java

@@ -0,0 +1,55 @@
+package client;
+
+import javafx.animation.PauseTransition;
+import javafx.animation.RotateTransition;
+import javafx.fxml.FXML;
+import javafx.fxml.FXMLLoader;
+import javafx.scene.Scene;
+import javafx.scene.shape.Arc;
+import javafx.stage.Stage;
+import javafx.util.Duration;
+
+import java.io.IOException;
+
+import static utilities.FxUtilities.centerStage;
+
+public class ClientLoading {
+    @FXML
+    private Arc spinnerArc;
+
+    /**
+     * Initialize the loading screen.
+     */
+    public void initialize() {
+        // Rotation animation cycle
+        RotateTransition rotate = new RotateTransition(Duration.seconds(1), spinnerArc);
+        rotate.setByAngle(360);
+        rotate.setCycleCount(RotateTransition.INDEFINITE);
+        rotate.play();
+
+        // Yes, this loading screen is just for show. But it's fun and pretty.
+        // PauseTransition allows no to block the rotation animation.
+        PauseTransition pause = new PauseTransition(Duration.millis(1000));
+        pause.setOnFinished(event -> {
+            try {
+                login();
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+        });
+        pause.play();
+    }
+
+    /**
+     * Load the client GUI and switch to it.
+     * @throws IOException if the FXML file is not found.
+     */
+    public void login() throws IOException {
+        var loader = new FXMLLoader(getClass().getResource("/client/clientVue.fxml"));
+        loader.load();
+        Stage stage = (Stage) spinnerArc.getScene().getWindow();
+        stage.setScene(new Scene(loader.getRoot(), 800, 600));
+        centerStage(stage);
+        stage.getScene().getStylesheets().add(getClass().getResource("clientStyle.css").toExternalForm());
+    }
+}

ChatApp/app/src/main/java/client/ClientLogin.java

@@ -0,0 +1,33 @@
+package client;
+
+import javafx.fxml.FXML;
+import javafx.fxml.FXMLLoader;
+import javafx.scene.Scene;
+import javafx.scene.control.TextField;
+import javafx.stage.Stage;
+import java.io.IOException;
+
+import static utilities.FxUtilities.centerStage;
+
+public class ClientLogin {
+    @FXML
+    public TextField usernameField;
+
+    /**
+     * Sets the username and switches to the loading screen.
+     * @throws IOException if the FXML file is not found.
+     */
+    @FXML
+    private void login() throws IOException {
+        String username = usernameField.getText();
+        if(username.isEmpty()) {
+            return;
+        }
+        UsernameSingleton.getInstance().setUsername(username);
+        var loader = new FXMLLoader(getClass().getResource("/client/clientLoading.fxml"));
+        loader.load();
+        Stage stage = (Stage) usernameField.getScene().getWindow();
+        stage.setScene(new Scene(loader.getRoot(), 800, 600));
+        centerStage(stage);
+    }
+}

ChatApp/app/src/main/java/client/UsernameSingleton.java

@@ -0,0 +1,31 @@
+package client;
+
+/**
+ * This class aims to make the username available to all controllers. (Recommended by JavaFX, because otherwise, FXMLLoader bugs and doesn't switch scenes properly.)
+ */
+public class UsernameSingleton {
+    private static UsernameSingleton instance;
+    private String username;
+
+    private UsernameSingleton() {
+    }
+
+    /**
+     * Get the instance of the singleton.
+     * @return the instance
+     */
+    public static UsernameSingleton getInstance() {
+        if (instance == null) {
+            instance = new UsernameSingleton();
+        }
+        return instance;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public void setUsername(String username) {
+        this.username = username;
+    }
+}

ChatApp/app/src/main/java/network/IPAddressFinder.java

@@ -0,0 +1,35 @@
+package network;
+
+import java.net.NetworkInterface;
+import java.net.SocketException;
+import java.util.Enumeration;
+import java.net.InetAddress;
+
+public class IPAddressFinder {
+    public static String findIPAddress(){
+        try {
+            Enumeration<NetworkInterface> networkInterfaces = NetworkInterface.getNetworkInterfaces();
+
+            while (networkInterfaces.hasMoreElements()) {
+                NetworkInterface networkInterface = networkInterfaces.nextElement();
+
+                Enumeration<InetAddress> inetAddresses = networkInterface.getInetAddresses();
+
+                while (inetAddresses.hasMoreElements()) {
+                    InetAddress inetAddress = inetAddresses.nextElement();
+
+                    if (!inetAddress.isLoopbackAddress()) {
+                        String ip = inetAddress.getHostAddress();
+
+                        if (ip.startsWith("192.168")) {
+                            return ip;
+                        }
+                    }
+                }
+            }
+        } catch (SocketException e) {
+            e.printStackTrace();
+        }
+        return "Not Found";
+    }
+}

ChatApp/app/src/main/java/network/PacketPool.java

@@ -0,0 +1,340 @@
+package network;
+
+import java.io.IOException;
+import java.net.InetSocketAddress;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.Objects;
+import java.util.Stack;
+
+import network.protocol.Packet;
+import network.protocol.packets.AcknowlegdementPacket;
+import network.protocol.packets.DisconnectPacket;
+
+public class PacketPool {
+
+	private final Stack<ReliablePacketAddress> packetQueue;
+	private final Map<InetSocketAddress, AdressContext> addressContexts;
+
+	private final Socket socket;
+
+	private static int MAX_SEND_TRY = 50;
+	private static long SEND_DELAY = 10;
+	private static long RETRY_INTERVAL = SEND_DELAY * 2;
+	private static float PACKET_LOSS_PROBABILITY = 0.1f;
+
+	private static record ReliablePacketAddress(ReliablePacket packet, InetSocketAddress address) {
+		@Override
+		public final int hashCode() {
+			return Objects.hash(packet, address);
+		}
+
+		@Override
+		public final boolean equals(Object arg0) {
+			if (arg0 instanceof ReliablePacketAddress packetAddress)
+				return packetAddress.address().equals(this.address())
+						&& packetAddress.packet().getSeq() == this.packet().getSeq();
+			return false;
+		}
+	}
+
+	/**
+	 * Data specific to one connexion
+	 */
+	private static class AdressContext {
+		public int currentSeqRecv = 0;
+		public int currentSeqSend = 0;
+		public final List<Thread> sendThreads = new ArrayList<>();
+		public final List<ReliablePacket> packetRecvBuffer = new ArrayList<>();
+		public final Map<ReliablePacket, Integer> packetsSentTries = new HashMap<>();
+	}
+
+	/**
+	 * @param address the address to send to
+	 * @return The next send sequence
+	 */
+	private int getNextSeqSend(InetSocketAddress address) {
+		return this.addressContexts.get(address).currentSeqSend++;
+	}
+
+	/**
+	 * @param address the address which a packet was recieved
+	 * @return the current recieve sequence number
+	 */
+	private int getCurrentSeqRecv(InetSocketAddress address) {
+		return this.addressContexts.get(address).currentSeqRecv;
+	}
+
+	/**
+	 * Set the recieve sequence number
+	 * @param address
+	 * @param newValue
+	 */
+	private void setSeqRecv(InetSocketAddress address, int newValue) {
+		this.addressContexts.get(address).currentSeqRecv = newValue;
+	}
+
+	/**
+	 * Try to add the address into memory
+	 * @param address
+	 */
+	private void tryAddContext(InetSocketAddress address) {
+		this.addressContexts.putIfAbsent(address, new AdressContext());
+	}
+
+	/**
+	 * Construct a PacketPool
+	 * @param socket
+	 */
+	public PacketPool(Socket socket) {
+		this.socket = socket;
+		this.packetQueue = new Stack<>();
+		this.addressContexts = new HashMap<>();
+	}
+
+	private void debugPrint(String msg) {
+		// System.out.println(msg);
+	}
+
+	private void debugSend(ReliablePacket packet, InetSocketAddress address) {
+		boolean client = address.getPort() == 6665;
+		debugPrint((client ? "[Client]" : "[Server]") + " Sent " + packet.getPacket().getClass().getName()
+				+ " with seq : " + packet.getSeq());
+	}
+
+	private void debugRecv(ReliablePacket packet, InetSocketAddress address) {
+		boolean client = address.getPort() == 6665;
+		debugPrint((client ? "[Client]" : "[Server]") + " Received " + packet.getPacket().getClass().getName()
+				+ " with seq : " + packet.getSeq());
+	}
+
+	/**
+	 * Send a packet to the socket
+	 * @param packet
+	 * @param address
+	 * @throws IOException
+	 */
+	private void sendPacketToSocket(ReliablePacket packet, InetSocketAddress address) throws IOException {
+		var packetsSentTries = this.addressContexts.get(address).packetsSentTries;
+
+		new Thread(() -> {
+			try {
+				Thread.sleep(SEND_DELAY);
+				if (Math.random() > PACKET_LOSS_PROBABILITY)
+					this.socket.sendPacket(packet, address);
+			} catch (InterruptedException | IOException e) {
+				// e.printStackTrace();
+			}
+		}).start();
+
+		if (packet.getPacket() instanceof AcknowlegdementPacket)
+			return;
+
+		Integer count = packetsSentTries.get(packet);
+		if (count == null) {
+			packetsSentTries.put(packet, 1);
+		} else {
+			packetsSentTries.put(packet, count + 1);
+		}
+	}
+
+	/**
+	 * Send a packet to socket and try to resend if an acknowlegment was not recieved
+	 * @param packet
+	 * @param address
+	 * @throws IOException
+	 */
+	private synchronized void sendPacket(ReliablePacket packet, InetSocketAddress address) throws IOException {
+		sendPacketToSocket(packet, address);
+		debugSend(packet, address);
+
+		ReliablePacketAddress reliablePacketAddress = new ReliablePacketAddress(packet, address);
+
+		if (!(packet.getPacket() instanceof AcknowlegdementPacket)) {
+			Thread newThread = new Thread(() -> tryResend(reliablePacketAddress));
+			this.addressContexts.get(address).sendThreads.add(newThread);
+			newThread.start();
+		}
+	}
+
+	/**
+	 * Send a packet (and encapsulate it)
+	 * @param packet
+	 * @param address
+	 * @throws IOException
+	 */
+	public synchronized void sendPacket(Packet packet, InetSocketAddress address) throws IOException {
+		tryAddContext(address);
+		ReliablePacket reliablePacket = new ReliablePacket(packet, getNextSeqSend(address));
+		sendPacket(reliablePacket, address);
+	}
+
+	/**
+	 * Try to resend a packet
+	 * @param reliablePacketAddress
+	 */
+	private void tryResend(ReliablePacketAddress reliablePacketAddress) {
+		try {
+			while (!Thread.interrupted()) {
+				Thread.sleep(RETRY_INTERVAL);
+				var packetsSentTries = this.addressContexts.get(reliablePacketAddress.address()).packetsSentTries;
+				// the packet has been received
+				if (!packetsSentTries.containsKey(reliablePacketAddress.packet()))
+					break;
+
+				Integer sendCount = packetsSentTries.get(reliablePacketAddress.packet());
+				if (sendCount > MAX_SEND_TRY) {
+					close(reliablePacketAddress.address());
+					debugPrint(
+							"Packet" + reliablePacketAddress.packet() + " not send after " + MAX_SEND_TRY + " tries");
+					// simulating a fake disconnect packet
+					this.socket.handlePacket(new DisconnectPacket("Timed out"), reliablePacketAddress.address());
+					break;
+				}
+
+				boolean client = reliablePacketAddress.address().getPort() == 6665;
+				debugPrint((client ? "[Client]" : "[Server]") + " Trying to resend the packet "
+						+ reliablePacketAddress.packet().getSeq() + " ...");
+				sendPacketToSocket(reliablePacketAddress.packet(), reliablePacketAddress.address());
+			}
+		} catch (InterruptedException e) {
+			// e.printStackTrace();
+		} catch (IOException e) {
+			e.printStackTrace();
+		}
+
+		AdressContext ctx = this.addressContexts.get(reliablePacketAddress.address());
+		if (ctx != null)
+			ctx.sendThreads.remove(Thread.currentThread());
+	}
+
+
+	/**
+	 * @param address
+	 * @return The smallest sequence number recieved
+	 */
+	private ReliablePacket getMinimumSeqReceived(InetSocketAddress address) {
+		List<ReliablePacket> packetRecvBuffer = this.addressContexts.get(address).packetRecvBuffer;
+		if (packetRecvBuffer.isEmpty())
+			return null;
+		return Collections.min(packetRecvBuffer, (rel1, rel2) -> {
+			return Integer.compare(rel1.getSeq(), rel2.getSeq());
+		});
+	}
+
+	/**
+	 * Move packets in buffer to the packet recieved queue to be processed by the app
+	 * @param address
+	 * @return the sequence number of the last packet that was added to the queue
+	 */
+	private int fillPacketQueue(InetSocketAddress address) {
+		List<ReliablePacket> packetRecvBuffer = this.addressContexts.get(address).packetRecvBuffer;
+		ReliablePacket minimum = getMinimumSeqReceived(address);
+		int lastSeqProcessed = -1;
+		while (true) {
+			this.packetQueue.add(new ReliablePacketAddress(minimum, address));
+			packetRecvBuffer.remove(minimum);
+			lastSeqProcessed = minimum.getSeq();
+
+			ReliablePacket nextMinimum = getMinimumSeqReceived(address);
+			if (nextMinimum == null || nextMinimum.getSeq() != minimum.getSeq() + 1)
+				break;
+			minimum = nextMinimum;
+		}
+		Collections.reverse(this.packetQueue);
+		return lastSeqProcessed;
+	}
+
+	/**
+	 * Process packet when recieved
+	 * @param packet
+	 * @param address
+	 * @throws IOException
+	 */
+	public void onPacketReceived(ReliablePacket packet, InetSocketAddress address) throws IOException {
+		tryAddContext(address);
+
+		var packetsSentTries = this.addressContexts.get(address).packetsSentTries;
+
+		if (packet.getPacket() instanceof AcknowlegdementPacket ackPacket) {
+			assert (ackPacket.getAck() != -1);
+			for (var entry : packetsSentTries.entrySet()) {
+				ReliablePacket reliablePacket = entry.getKey();
+				if (entry.getKey().getSeq() == ackPacket.getAck()) {
+					packetsSentTries.remove(reliablePacket);
+					break;
+				}
+			}
+			return;
+		}
+
+		if (this.addressContexts.get(address).packetRecvBuffer.contains(packet)) {
+			debugPrint("The packet has already been received !");
+			sendPacketToSocket(
+					new ReliablePacket(new AcknowlegdementPacket(packet.getSeq()), -1), address);
+			return;
+		}
+
+		if (packet.getSeq() < getCurrentSeqRecv(address)) {
+			debugPrint("Packet too old, current : " + getCurrentSeqRecv(address));
+			sendPacketToSocket(
+					new ReliablePacket(new AcknowlegdementPacket(packet.getSeq()), -1), address);
+			return;
+		}
+
+		this.addressContexts.get(address).packetRecvBuffer.add(packet);
+		debugRecv(packet, address);
+		sendPacketToSocket(
+				new ReliablePacket(new AcknowlegdementPacket(packet.getSeq()), -1), address);
+
+		// got the packet in the right order
+		if (packet.getSeq() == getCurrentSeqRecv(address)) {
+			setSeqRecv(address, fillPacketQueue(address) + 1);
+		}
+
+	}
+
+	/**
+	 * @return The next packet in the queue
+	 */
+	public Entry<Packet, InetSocketAddress> getNextPacket() {
+		if (this.packetQueue.isEmpty())
+			return null;
+		ReliablePacketAddress last = this.packetQueue.pop();
+		var entry = Map.entry(last.packet().getPacket(), last.address);
+		return entry;
+	}
+
+	/**
+	 * Closes the connexion
+	 * @param adress
+	 */
+	private void close(InetSocketAddress adress) {
+		var ctx = this.addressContexts.get(adress);
+		if (ctx != null)
+			close(ctx);
+	}
+
+	/**
+	 * Stop the threads of the connexion
+	 * @param adressContext
+	 */
+	private void close(AdressContext adressContext) {
+		for (Thread thread : adressContext.sendThreads) {
+			thread.interrupt();
+		}
+	}
+
+	/**
+	 * Stop the PacketPool
+	 */
+	public void close() {
+		for (AdressContext adressContext : this.addressContexts.values()) {
+			close(adressContext);
+		}
+	}
+}

ChatApp/app/src/main/java/network/ReliablePacket.java

@@ -0,0 +1,38 @@
+package network;
+
+import java.io.Serializable;
+
+import network.protocol.Packet;
+
+public class ReliablePacket implements Serializable {
+
+	private final Packet packet;
+	private final int seq;
+
+	public ReliablePacket(Packet packet, int seq) {
+		this.packet = packet;
+		this.seq = seq;
+	}
+
+	/**
+	 * @return The encapsulated packet
+	 */
+	public Packet getPacket() {
+		return packet;
+	}
+
+	/**
+	 * @return The sequence number of this packet
+	 */
+	public int getSeq() {
+		return seq;
+	}
+
+	@Override
+	public boolean equals(Object obj) {
+		if (obj instanceof ReliablePacket packet)
+			return packet.getSeq() == this.getSeq();
+		return false;
+	}
+
+}

ChatApp/app/src/main/java/network/Socket.java

@@ -0,0 +1,158 @@
+package network;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+import java.net.InetSocketAddress;
+import java.net.SocketException;
+import java.util.ArrayList;
+import java.util.List;
+
+import network.protocol.Packet;
+import utilities.Signal;
+
+public class Socket {
+	private final DatagramSocket socket;
+	private final List<PacketHandler> handlers;
+	private final Thread readThread;
+	private final PacketPool packetPool;
+
+	public final Signal onClose = new Signal();
+
+	/**
+	 * Construct a UDP Socket to connect to a server
+	 * @throws SocketException
+	 */
+	public Socket() throws SocketException {
+		this.socket = new DatagramSocket();
+		this.handlers = new ArrayList<>();
+		this.packetPool = new PacketPool(this);
+		this.readThread = new Thread(this::readLoop);
+		this.readThread.start();
+	}
+
+	/**
+	 * Construct a UDP Socket to listen to connexion at the specified port
+	 * @param listeningPort the port to listen to
+	 * @throws SocketException
+	 */
+	public Socket(int listeningPort) throws SocketException {
+		this.socket = new DatagramSocket(listeningPort);
+		this.handlers = new ArrayList<>();
+		this.packetPool = new PacketPool(this);
+		this.readThread = new Thread(this::readLoop);
+		this.readThread.start();
+	}
+
+	public void addHandler(PacketHandler handler) {
+		this.handlers.add(handler);
+	}
+
+	/**
+	 * @return this.socket.getLocalPort()
+	 */
+	public int getLocalPort() {
+		return this.socket.getLocalPort();
+	}
+
+	// needs to be accessible by PacketPool
+	/**
+	 * Send a packet to the specified address
+	 * @param packet the packet to send
+	 * @param address the address to send to
+	 * @throws IOException
+	 */
+	void sendPacket(ReliablePacket packet, InetSocketAddress address) throws IOException {
+		ByteArrayOutputStream stream = new ByteArrayOutputStream();
+		ObjectOutputStream oos = new ObjectOutputStream(stream);
+		oos.writeObject(packet);
+		oos.flush();
+		byte[] data = stream.toByteArray();
+		DatagramPacket dataPacket = new DatagramPacket(data, data.length, address.getAddress(),
+				address.getPort());
+		this.socket.send(dataPacket);
+	}
+
+	/**
+	 * Try to recieve packets and send them to the PacketPool.
+	 * This method blocks until something has been read
+	 * @throws IOException
+	 * @throws ClassNotFoundException
+	 */
+	private void recievePacketReliable()
+			throws IOException, ClassNotFoundException {
+		byte[] buffer = new byte[65535];
+		DatagramPacket dataPacket = new DatagramPacket(buffer, buffer.length);
+		socket.receive(dataPacket);
+
+		InetSocketAddress address = new InetSocketAddress(dataPacket.getAddress(), dataPacket.getPort());
+
+		ObjectInputStream ois = new ObjectInputStream(new ByteArrayInputStream(dataPacket.getData()));
+		ReliablePacket packet = (ReliablePacket) ois.readObject();
+
+		this.packetPool.onPacketReceived(packet, address);
+	}
+
+	/**
+	 * Send a packet to the specified address
+	 * @param packet the packet to send
+	 * @param address the address to send to
+	 * @throws IOException
+	 */
+	public void sendPacket(Packet packet, InetSocketAddress address) throws IOException {
+		this.packetPool.sendPacket(packet, address);
+	}
+
+	/**
+	 * Recieve packet in a reliable way (packets are in the right order).
+	 * This method is blocking
+	 * @throws IOException
+	 * @throws ClassNotFoundException
+	 */
+	private void recievePacket() throws IOException, ClassNotFoundException {
+		this.recievePacketReliable();
+		var entry = this.packetPool.getNextPacket();
+		while (entry != null) {
+			this.handlePacket(entry.getKey(), entry.getValue());
+			entry = this.packetPool.getNextPacket();
+		}
+	}
+
+	/**
+	 * Close the socket
+	 */
+	public void close() {
+		this.socket.close();
+		this.packetPool.close();
+		this.readThread.interrupt();
+		this.onClose.emit();
+	}
+
+	/**
+	 * Dispatch the packet
+	 * @param packet the packet to dispatch
+	 * @param address the incoming address
+	 */
+	void handlePacket(Packet packet, InetSocketAddress address) {
+		for (PacketHandler handler : this.handlers) {
+			handler.handlePacket(packet, address);
+		}
+	}
+
+	/**
+	 * Loop to read all packets
+	 */
+	private void readLoop() {
+		try {
+			while (!Thread.interrupted()) {
+				recievePacket();
+			}
+		} catch (IOException | ClassNotFoundException e) {
+			// e.printStackTrace();
+		}
+	}
+}

ChatApp/app/src/main/java/network/protocol/ANSIColor.java

@@ -1,5 +1,7 @@
 package network.protocol;
 
+import java.util.regex.Pattern;
+
 public class ANSIColor {
     public static final String RESET = "\u001B[0m";
     public static final String BLACK = "\u001B[30m";
@@ -15,4 +17,8 @@ public class ANSIColor {
                 .replace("&y", GREY)
                 .replace("&n", RESET);
     }
+
+    public static String tag(String message, String chatter){
+        return message.replaceAll("(@" + Pattern.quote(chatter) + ")", "\u001B[44;30m$1\u001B[49;39m" );
+    }
 }

ChatApp/app/src/main/java/network/protocol/Packet.java

@@ -4,6 +4,10 @@ import java.io.Serializable;
 
 public abstract class Packet implements Serializable {
 
+	/**
+	 * Used for double dispatch
+	 * @param packetVisitor the visitor to dispatch to
+	 */
 	public abstract void accept(PacketVisitor packetVisitor);
 
 }

ChatApp/app/src/main/java/network/protocol/PacketVisitor.java

@@ -1,23 +1,20 @@
 package network.protocol;
 
-import network.protocol.packets.ChatMessagePacket;
+import network.protocol.packets.*;
-import network.protocol.packets.CreateRoomPacket;
-import network.protocol.packets.JoinRoomPacket;
-import network.protocol.packets.LeaveRoomPacket;
-import network.protocol.packets.LoginPacket;
-import network.protocol.packets.RequestRoomListPacket;
-import network.protocol.packets.RoomListPacket;
-import network.protocol.packets.SendChatMessagePacket;
-import network.protocol.packets.ServerResponsePacket;
 
 public interface PacketVisitor {
 
+	/**
+	 * Use double dispatch to process a packet
+	 * @param packet the packet to process
+	 */
 	default void visit(Packet packet) {
 		packet.accept(this);
 	}
 	
 	void visitPacket(ChatMessagePacket packet);
 	void visitPacket(CreateRoomPacket packet);
+	void visitPacket(DisconnectPacket packet);
 	void visitPacket(JoinRoomPacket packet);
 	void visitPacket(LeaveRoomPacket packet);
 	void visitPacket(LoginPacket packet);
@@ -25,5 +22,7 @@ public interface PacketVisitor {
 	void visitPacket(RoomListPacket packet);
 	void visitPacket(SendChatMessagePacket packet);
 	void visitPacket(ServerResponsePacket packet);
-	
+	void visitPacket(RequestActualRoomPacket packet);
+	void visitPacket(ActualRoomPacket packet);
+
 }

ChatApp/app/src/main/java/network/protocol/packets/AcknowlegdementPacket.java

@@ -0,0 +1,23 @@
+package network.protocol.packets;
+
+import network.protocol.Packet;
+import network.protocol.PacketVisitor;
+
+public class AcknowlegdementPacket extends Packet {
+
+	private final int ack;
+
+	public AcknowlegdementPacket(int ack) {
+		this.ack = ack;
+	}
+
+	@Override
+	public void accept(PacketVisitor packetVisitor) {
+		// this packet should not be handled by the app
+	}
+
+	public int getAck() {
+		return ack;
+	}
+
+}

ChatApp/app/src/main/java/network/protocol/packets/ActualRoomPacket.java

@@ -0,0 +1,21 @@
+package network.protocol.packets;
+
+import network.protocol.Packet;
+import network.protocol.PacketVisitor;
+
+public class ActualRoomPacket extends Packet {
+    private final String roomName;
+
+    public ActualRoomPacket(String roomName) {
+        this.roomName = roomName;
+    }
+
+    public String getRoomName() {
+        return roomName;
+    }
+
+    @Override
+    public void accept(PacketVisitor packetVisitor) {
+        packetVisitor.visitPacket(this);
+    }
+}

ChatApp/app/src/main/java/network/protocol/packets/DisconnectPacket.java

@@ -0,0 +1,23 @@
+package network.protocol.packets;
+
+import network.protocol.Packet;
+import network.protocol.PacketVisitor;
+
+public class DisconnectPacket extends Packet {
+
+	private final String reason;
+
+	public DisconnectPacket(String reason) {
+		this.reason = reason;
+	}
+
+	public String getReason() {
+		return reason;
+	}
+
+	@Override
+	public void accept(PacketVisitor packetVisitor) {
+		packetVisitor.visitPacket(this);
+	}
+
+}

ChatApp/app/src/main/java/network/protocol/packets/RequestActualRoomPacket.java

@@ -0,0 +1,14 @@
+package network.protocol.packets;
+
+import network.protocol.Packet;
+import network.protocol.PacketVisitor;
+
+public class RequestActualRoomPacket extends Packet {
+    public RequestActualRoomPacket() {
+    }
+
+    @Override
+    public void accept(PacketVisitor packetVisitor) {
+        packetVisitor.visitPacket(this);
+    }
+}

ChatApp/app/src/main/java/network/protocol/packets/RoomListPacket.java

@@ -1,19 +1,19 @@
 package network.protocol.packets;
 
-import java.util.ArrayList;
+import java.util.List;
 
 import network.protocol.Packet;
 import network.protocol.PacketVisitor;
 
 public class RoomListPacket extends Packet {
 
-	private final ArrayList<String> roomNames;
+	private final List<String> roomNames;
 
-	public RoomListPacket(ArrayList<String> roomNames) {
+	public RoomListPacket(List<String> roomNames) {
 		this.roomNames = roomNames;
 	}
 
-	public ArrayList<String> getRoomNames() {
+	public List<String> getRoomNames() {
 		return roomNames;
 	}
 

ChatApp/app/src/main/java/server/Server.java

@@ -0,0 +1,153 @@
+package server;
+
+import java.net.InetSocketAddress;
+import java.net.SocketException;
+import java.time.Instant;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.Map;
+
+import network.PacketHandler;
+import network.Socket;
+import network.protocol.ANSIColor;
+import network.protocol.Packet;
+import network.protocol.packets.ChatMessagePacket;
+import network.protocol.packets.SendChatMessagePacket;
+
+public class Server implements PacketHandler {
+
+	private final Socket serverSocket;
+	private final Map<InetSocketAddress, ServerConnexion> connexions;
+	private final Map<InetSocketAddress, Instant> connexionTimes;
+	private final Map<String, ArrayList<ServerConnexion>> rooms;
+
+	public Server(int port) throws SocketException {
+		this.serverSocket = new Socket(port);
+		this.serverSocket.addHandler(this);
+		this.connexions = new HashMap<>();
+		this.connexionTimes = new HashMap<>();
+		this.rooms = new HashMap<>();
+	}
+
+	public ArrayList<String> getRoomNames() {
+		return rooms.keySet().stream().collect(ArrayList::new, ArrayList::add, ArrayList::addAll);
+	}
+
+	public boolean isInRoom(ServerConnexion connexion) {
+		return getRoomName(connexion) != null;
+	}
+
+	public String getRoomName(ServerConnexion connexion) {
+		for (Map.Entry<String, ArrayList<ServerConnexion>> entry : rooms.entrySet()) {
+			if (entry.getValue().contains(connexion)) {
+				return entry.getKey();
+			}
+		}
+		return null;
+	}
+
+	public boolean createRoom(String roomName, ServerConnexion connexion) {
+		if (rooms.containsKey(roomName)) {
+			return false;
+		}
+		rooms.put(roomName, new ArrayList<>());
+		leaveRoom(connexion); // Leave the current room (auto handle if not in a room)
+		rooms.get(roomName).add(connexion); // Add the creator to the room
+		return true;
+	}
+
+	public boolean leaveRoom(ServerConnexion connexion) {
+		String roomName = getRoomName(connexion);
+		if (roomName != null) {
+			rooms.get(roomName).remove(connexion);
+			// Remove the room if it is empty
+			if (rooms.get(roomName).isEmpty()) {
+				rooms.remove(roomName);
+			}
+			return true;
+		}
+		return false;
+	}
+
+	public boolean joinRoom(String roomName, ServerConnexion connexion) {
+		leaveRoom(connexion); // Leave the current room (auto handle if not in a room)
+		if (rooms.containsKey(roomName) && !rooms.get(roomName).contains(connexion)) {
+			rooms.get(roomName).add(connexion);
+			return true;
+		}
+		return false;
+	}
+
+	public boolean sendToRoom(String roomName, ChatMessagePacket packet) {
+		if (roomName != null && rooms.containsKey(roomName)) {
+			rooms.get(roomName).forEach(con -> con.sendPacket(
+					new ChatMessagePacket(packet.getTime(), packet.getChatter(), ANSIColor.tag(packet.getContent(), con.getChatterName()))
+			));
+			return true;
+		}
+		return false;
+	}
+
+	public boolean sendToRoom(ServerConnexion connexion, ChatMessagePacket packet) {
+		String roomName = getRoomName(connexion);
+		return sendToRoom(roomName, packet);
+	}
+
+	public boolean sendToRoom(ServerConnexion connexion, SendChatMessagePacket packet) {
+		return sendToRoom(connexion,
+				new ChatMessagePacket(Instant.now(), connexion.getChatterName(), packet.getContent()));
+	}
+
+	public void close() {
+		this.serverSocket.close();
+	}
+
+	public boolean hasChatterName(String pseudo) {
+		return this.connexions.values().stream()
+				.anyMatch(connexion -> pseudo.equals(connexion.getChatterName()));
+	}
+
+	void removeConnexion(ServerConnexion connexion) {
+		for (var it = this.connexions.entrySet().iterator(); it.hasNext();) {
+			var entry = it.next();
+			if (entry.getValue() == connexion) {
+				it.remove();
+				break;
+			}
+		}
+		for (var entry : this.rooms.entrySet()) {
+			if (entry.getValue().remove(connexion))
+				return;
+		}
+	}
+
+	@Override
+	public void handlePacket(Packet packet, InetSocketAddress address) {
+		if (!connexions.containsKey(address)) {
+			this.connexions.put(address, new ServerConnexion(this, serverSocket, address));
+		}
+		this.connexions.get(address).visit(packet);
+	}
+
+	/**
+	 * Avoid the server to spam the chat
+	 * @param address the address of the connexion
+	 * @return true if the connexion is the first received or older than 5 seconds
+	 */
+	public boolean handleConnexionTime(InetSocketAddress address) {
+		if (!connexionTimes.containsKey(address)) {
+			connexionTimes.put(address, Instant.now());
+			return true;
+		}
+		Instant lastConnexion = connexionTimes.get(address);
+		if (Instant.now().isAfter(lastConnexion.plusSeconds(5))) {
+			connexionTimes.put(address, Instant.now());
+			return true;
+		}
+		return false;
+	}
+
+	public int getRunningPort() {
+		return this.serverSocket.getLocalPort();
+	}
+}

ChatApp/app/src/main/java/server/ServerConnexion.java

@@ -0,0 +1,206 @@
+package server;
+
+import java.io.IOException;
+import java.net.InetSocketAddress;
+import java.time.Instant;
+
+import network.Socket;
+import network.protocol.Packet;
+import network.protocol.PacketVisitor;
+import network.protocol.packets.*;
+import network.protocol.packets.ServerResponsePacket.Response;
+
+public class ServerConnexion implements PacketVisitor {
+
+	private final Server server;
+	private final InetSocketAddress clientAddress;
+	private final Socket socket;
+	private String chatterName;
+
+	public ServerConnexion(Server server, Socket socket, InetSocketAddress clientAddress) {
+		this.clientAddress = clientAddress;
+		this.server = server;
+		this.socket = socket;
+	}
+
+	public String getChatterName() {
+		return this.chatterName;
+	}
+
+	public void sendPacket(Packet packet) {
+		try {
+			this.socket.sendPacket(packet, clientAddress);
+		} catch (IOException e) {
+			e.printStackTrace();
+			this.server.removeConnexion(this);
+		}
+	}
+
+	/**
+	 * Check if the client is logged in
+	 * @return true if the client is logged in
+	 */
+	private boolean checkLogin() {
+		if (this.chatterName != null && this.chatterName.isEmpty()) {
+			sendPacket(new ServerResponsePacket(Response.AuthError));
+			return false;
+		}
+		return true;
+	}
+
+
+	/**
+	 * Make the server create a room & enter it
+	 * @param packet the packet containing the room name
+	 */
+	@Override
+	public void visitPacket(CreateRoomPacket packet) {
+		if (!checkLogin())
+			return;
+		boolean created = server.createRoom(packet.getRoomName(), this);
+		sendPacket(new ServerResponsePacket(created ? Response.RoomCreated : Response.RoomNotCreated));
+		if (created)
+			onRoomJoin();
+	}
+
+	/**
+	 * Make the server join a room
+	 * @param packet the packet containing the room name
+	 */
+	@Override
+	public void visitPacket(JoinRoomPacket packet) {
+		if (!checkLogin())
+			return;
+		if (server.getRoomName(this) != null) {
+			server.leaveRoom(this);
+			return;
+		}
+		boolean joined = server.joinRoom(packet.getRoomName(), this);
+		sendPacket(new ServerResponsePacket(joined ? Response.RoomJoined : Response.RoomNotJoined));
+		if (joined)
+			onRoomJoin();
+	}
+
+	/**
+	 * Make the server leave a room
+	 * @param packet the packet containing the room name
+	 */
+	@Override
+	public void visitPacket(LeaveRoomPacket packet) {
+		if (!checkLogin())
+			return;
+		String roomName = this.server.getRoomName(this);
+		boolean left = server.leaveRoom(this);
+		sendPacket(new ServerResponsePacket(left ? Response.RoomLeft : Response.RoomNotLeft));
+		if (left)
+			onRoomLeave(roomName);
+	}
+
+	/**
+	 * Checks if the pseudo is available (nobody connected with the same pseudo)
+	 * @param packet the packet containing the pseudo
+	 */
+	@Override
+	public void visitPacket(LoginPacket packet) {
+		if (packet.getPseudo().isEmpty() || server.hasChatterName(packet.getPseudo())) {
+			sendPacket(new ServerResponsePacket(Response.AuthError));
+			return;
+		}
+
+		this.chatterName = packet.getPseudo();
+		sendPacket(new ServerResponsePacket(Response.AuthSuccess));
+		sendPacket(new RoomListPacket(server.getRoomNames()));
+		System.out.println("[Server] Chatter " + packet.getPseudo() + " connected !");
+	}
+
+	/**
+	 * Get the list of rooms
+	 * @param packet the packet containing the request
+	 */
+	@Override
+	public void visitPacket(RequestRoomListPacket packet) {
+		if (!checkLogin())
+			return;
+		sendPacket(new RoomListPacket(server.getRoomNames()));
+	}
+
+	/**
+	 * Send a message to the room
+	 * @param packet the packet containing the message
+	 */
+	@Override
+	public void visitPacket(SendChatMessagePacket packet) {
+		if (!checkLogin())
+			return;
+		boolean messageSent = server.sendToRoom(this, packet);
+		sendPacket(new ServerResponsePacket(messageSent ? Response.MessageSent : Response.MessageNotSent));
+	}
+
+	/**
+	 * Disconnect the client
+	 * @param packet the packet containing the request
+	 */
+	@Override
+	public void visitPacket(DisconnectPacket packet) {
+		this.onDisconnect();
+	}
+
+	/**
+	 * Remove all room connections while disconnecting the client
+	 */
+	private void onDisconnect() {
+		if (this.server.isInRoom(this)) {
+			this.onRoomLeave(this.server.getRoomName(this));
+		}
+		this.server.removeConnexion(this);
+		if (chatterName != null)
+			System.out.println("[Server] Chatter " + chatterName + " disconnected !");
+	}
+
+	/**
+	 * Send a message to the room when a client joins
+	 */
+	private void onRoomJoin() {
+		String joinMessage = "Chatter " + this.chatterName + " joined the room !";
+		this.server.sendToRoom(this, new ChatMessagePacket(Instant.now(), "", joinMessage));
+	}
+
+	/**
+	 * Send a message to the room when a client leaves
+	 * @param roomName the name of the room
+	 */
+	private void onRoomLeave(String roomName) {
+		String joinMessage = "Chatter " + this.chatterName + " left the room !";
+		this.server.sendToRoom(roomName, new ChatMessagePacket(Instant.now(), "", joinMessage));
+	}
+
+	@Override
+	public void visitPacket(RoomListPacket packet) {
+		// I'm never supposed to receive this from the client
+		throw new UnsupportedOperationException("Unimplemented method 'visitPacket'");
+	}
+
+	@Override
+	public void visitPacket(ChatMessagePacket packet) {
+		// I'm never supposed to receive this from the client
+		throw new UnsupportedOperationException("Unimplemented method 'visitPacket'");
+	}
+
+	@Override
+	public void visitPacket(ServerResponsePacket packet) {
+		// I'm never supposed to receive this from the client
+		throw new UnsupportedOperationException("Unimplemented method 'visitPacket'");
+	}
+
+	@Override
+	public void visitPacket(RequestActualRoomPacket packet) {
+		sendPacket(new ActualRoomPacket(server.getRoomName(this)));
+	}
+
+	@Override
+	public void visitPacket(ActualRoomPacket packet) {
+		// I'm never supposed to receive this from the client
+		throw new UnsupportedOperationException("Unimplemented method 'visitPacket'");
+	}
+
+}

ChatApp/app/src/main/java/server/ServerGui.java

@@ -0,0 +1,37 @@
+package server;
+
+import javafx.application.Application;
+import javafx.fxml.FXMLLoader;
+import javafx.scene.Scene;
+import javafx.stage.Stage;
+import javafx.scene.image.Image;
+import javafx.stage.Screen;
+
+import java.io.IOException;
+import java.util.Objects;
+
+public class ServerGui extends Application {
+    @Override
+    public void start(Stage stage) throws IOException {
+        FXMLLoader loader = new FXMLLoader(getClass().getResource("/server/serverVue.fxml"));
+        Scene scene = new Scene(loader.load(), 400, 240);
+
+        double screenWidth = Screen.getPrimary().getVisualBounds().getWidth();
+        double screenHeight = Screen.getPrimary().getVisualBounds().getHeight();
+
+        double xPos = screenWidth / 2 - scene.getWidth() / 2;
+        double yPos = screenHeight / 2 - scene.getHeight() / 2;
+
+        scene.getStylesheets().add(getClass().getResource("serverStyle.css").toExternalForm());
+        stage.getIcons().add(new Image(Objects.requireNonNull(getClass().getResourceAsStream("/liscord.png"))));
+        stage.setTitle("Liscord Server");
+        stage.setScene(scene);
+        stage.setX(xPos);
+        stage.setY(yPos);
+        stage.show();
+    }
+
+    public static void main(String[] args) {
+        launch();
+    }
+}

ChatApp/app/src/main/java/server/ServerGuiController.java

@@ -0,0 +1,42 @@
+package server;
+
+import javafx.fxml.FXML;
+import javafx.scene.control.Button;
+import javafx.scene.control.Label;
+import network.IPAddressFinder;
+
+import java.net.SocketException;
+import java.net.UnknownHostException;
+
+public class ServerGuiController {
+    @FXML
+    private Label IPAddress;
+
+    @FXML
+    private Button toggleServerButton;
+
+    private Server server;
+
+    @FXML
+    public void initialize() {
+        IPAddress.setText("IP Address: " + IPAddressFinder.findIPAddress());
+    }
+
+    @FXML
+    public void toggleServer() throws SocketException {
+        if(server == null){
+            toggleServerButton.setDisable(true);
+            server = new Server(6665);
+            toggleServerButton.setDisable(false);
+            toggleServerButton.setText("Stop Server");
+            System.out.println("Server started on port 6665");
+        } else {
+            toggleServerButton.setDisable(true);
+            server.close();
+            server = null;
+            toggleServerButton.setDisable(false);
+            toggleServerButton.setText("Start Server");
+        }
+    }
+
+}

ChatApp/app/src/main/java/utilities/ANSIColor.java

@@ -0,0 +1,24 @@
+package utilities;
+
+import java.util.regex.Pattern;
+
+public class ANSIColor {
+    public static final String RESET = "\u001B[0m";
+    public static final String BLACK = "\u001B[30m";
+    public static final String RED = "\u001B[31m";
+    public static final String GREEN = "\u001B[32m";
+    public static final String BLUE = "\u001B[34m";
+    public static final String GREY = "\u001B[37m";
+
+    public static String formatString(String message){
+        return message.replace("&r", RED)
+                .replace("&g", GREEN)
+                .replace("&b", BLUE)
+                .replace("&y", GREY)
+                .replace("&n", RESET);
+    }
+
+    public static String tag(String message, String chatter){
+        return message.replaceAll("(@" + Pattern.quote(chatter) + ")", "\u001B[44;30m$1\u001B[49;39m" );
+    }
+}

ChatApp/app/src/main/java/utilities/FxUtilities.java

@@ -0,0 +1,17 @@
+package utilities;
+
+import javafx.stage.Screen;
+import javafx.stage.Stage;
+
+public class FxUtilities {
+    public static void centerStage(Stage stage) {
+        double screenWidth = Screen.getPrimary().getVisualBounds().getWidth();
+        double screenHeight = Screen.getPrimary().getVisualBounds().getHeight();
+
+        double xPos = screenWidth / 2 - stage.getWidth() / 2;
+        double yPos = screenHeight / 2 - stage.getHeight() / 2;
+
+        stage.setX(xPos);
+        stage.setY(yPos);
+    }
+}

ChatApp/app/src/main/java/utilities/Signal.java

@@ -0,0 +1,38 @@
+package utilities;
+
+import java.util.HashSet;
+import java.util.Set;
+
+public class Signal {
+
+	private final Class<?>[] types;
+	private final Set<Slot> listeners;
+
+	public Signal(Class<?>... types) {
+		this.types = types;
+		this.listeners = new HashSet<>();
+	}
+
+	public void connect(Slot listener) {
+		this.listeners.add(listener);
+	}
+
+	public void clear() {
+		this.listeners.clear();
+	}
+
+	public void emit(Object... values) {
+		for (Slot listener : this.listeners) {
+			if (values.length != types.length) {
+				throw new UnsupportedOperationException("The number of provided arguments is not right");
+			}
+			for (int i = 0; i < values.length; i++) {
+				if (!types[i].isInstance(values[i])) {
+					throw new UnsupportedOperationException("Incorrect value at index " + i);
+				}
+			}
+			listener.run(values);
+		}
+	}
+
+}

ChatApp/app/src/main/java/utilities/Slot.java

@@ -0,0 +1,5 @@
+package utilities;
+
+public interface Slot {
+	void run(Object ... args);
+}

ChatApp/app/src/main/resources/client/clientLoading.fxml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<?import javafx.scene.layout.StackPane?>
+<?import javafx.scene.shape.Arc?>
+
+<?import javafx.scene.control.Label?>
+<StackPane xmlns="http://javafx.com/javafx" xmlns:fx="http://javafx.com/fxml"
+           fx:controller="client.ClientLoading" style="-fx-background-color: lightgrey;">
+    <Arc fx:id="spinnerArc" centerX="50" centerY="50" radiusX="30" radiusY="30"
+         startAngle="30" length="330" fill="transparent" stroke="blue" strokeWidth="5" onMouseClicked="#login"
+    />
+</StackPane>

ChatApp/app/src/main/resources/client/clientLogin.fxml

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<?import java.lang.*?>
+<?import java.util.*?>
+<?import javafx.scene.*?>
+<?import javafx.scene.control.*?>
+<?import javafx.scene.layout.*?>
+
+<?import javafx.geometry.Insets?>
+
+<VBox alignment="CENTER" spacing="10.0"
+      xmlns="http://javafx.com/javafx"
+      xmlns:fx="http://javafx.com/fxml"
+      fx:controller="client.ClientLogin"
+      prefHeight="400.0" prefWidth="600.0"
+    styleClass="login-box">
+    <padding>
+        <Insets bottom="10.0" left="100.0" right="100.0" top="10.0"/>
+    </padding>
+    <Label text="Enter your username"/>
+    <TextField fx:id="usernameField" onAction="#login" styleClass="login"/>
+    <Button text="Login" onAction="#login"/>
+</VBox>

ChatApp/app/src/main/resources/client/clientStyle.css

@@ -0,0 +1,17 @@
+.login-box, .logo-box, .rooms-list, .chat-list {
+    -fx-background-color: lightgray;
+}
+
+.login {
+    -fx-border-color: transparent;
+}
+
+.login:focused {
+    -fx-border-color: lightgrey;
+}
+
+.rooms-label {
+    -fx-font-size: 18px;
+    -fx-padding: 10px;
+    -fx-background-color: lightgray;
+}

ChatApp/app/src/main/resources/client/clientVue.fxml

@@ -0,0 +1,49 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<?import java.lang.*?>
+<?import java.util.*?>
+<?import javafx.scene.*?>
+<?import javafx.scene.control.*?>
+<?import javafx.scene.layout.*?>
+
+<?import javafx.geometry.Insets?>
+<?import javafx.scene.image.ImageView?>
+<?import javafx.scene.image.Image?>
+<BorderPane xmlns="http://javafx.com/javafx"
+            xmlns:fx="http://javafx.com/fxml"
+            fx:controller="client.ClientGuiController"
+            prefHeight="400.0" prefWidth="600.0" styleClass="vue-container" fx:id="vueContainer">
+    <top>
+        <HBox alignment="CENTER" styleClass="logo-box">
+            <padding>
+                <Insets bottom="10.0" left="10.0" right="10.0" top="10.0"/>
+            </padding>
+            <ImageView fitHeight="50.0" fitWidth="50.0">
+                <Image url="@/liscord.png" />
+            </ImageView>
+            <Label text="Liscord" style="-fx-font-size: 24px; -fx-font-weight: bold; -fx-padding: 0 0 0 10px"/>
+        </HBox>
+    </top>
+    <left>
+        <ScrollPane prefWidth="200.0" styleClass="rooms-pane" fx:id="roomsPane" fitToWidth="true">
+            <VBox fx:id="rooms" spacing="10.0" alignment="CENTER" VBox.vgrow="ALWAYS">
+                <Label text="Rooms" styleClass="rooms-label"/>
+                <VBox fx:id="roomList" styleClass="rooms-list" spacing="5.0" VBox.vgrow="ALWAYS" alignment="CENTER"/>
+            </VBox>
+        </ScrollPane>
+    </left>
+    <center>
+        <BorderPane>
+            <center>
+                <ScrollPane styleClass="chat-pane" fx:id="chatPane" fitToWidth="true">
+                    <VBox fx:id="chat" spacing="10.0">
+                        <VBox fx:id="chatList" styleClass="chat-list" spacing="5.0" VBox.vgrow="ALWAYS"/>
+                    </VBox>
+                </ScrollPane>
+            </center>
+            <bottom>
+                <HBox fx:id="chatInput" styleClass="chat-input" spacing="5.0" style="-fx-padding: 10;" />
+            </bottom>
+        </BorderPane>
+    </center>
+</BorderPane>

ChatApp/app/src/main/resources/server/serverStyle.css

@@ -0,0 +1,27 @@
+.root{
+    -fx-background-color: darkblue;
+    -fx-text-fill: blue;
+    -fx-font-weight: bold;
+}
+
+.address {
+    -fx-text-fill: white;
+    -fx-font-size: 25px;
+}
+
+.toggle-button {
+    -fx-background-color: darkblue;
+    -fx-text-fill: white;
+    -fx-font-size: 20px;
+    -fx-padding: 10px;
+    -fx-border-width: 2px;
+    -fx-border-color: white;
+    -fx-cursor: hand;
+    -fx-border-radius: 5;
+}
+
+.toggle-button:hover {
+    -fx-background-color: white;
+    -fx-text-fill: darkblue;
+    transition: -fx-background-color 0.3s, -fx-text-fill 0.3s;
+}

ChatApp/app/src/main/resources/server/serverVue.fxml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<?import javafx.geometry.*?>
+<?import javafx.scene.control.*?>
+<?import javafx.scene.layout.*?>
+
+<VBox alignment="CENTER" spacing="20.0" xmlns="http://javafx.com/javafx/11.0.14-internal" xmlns:fx="http://javafx.com/fxml/1" fx:controller="server.ServerGuiController">
+    <padding>
+        <Insets bottom="20.0" left="20.0" right="20.0" top="20.0" />
+    </padding>
+
+    <Label fx:id="IPAddress" styleClass="address" />
+    <Button text="Start Server" onAction="#toggleServer" fx:id="toggleServerButton" styleClass="toggle-button"/>
+</VBox>

ChatApp/gradle.properties

@@ -0,0 +1,6 @@
+# This file was generated by the Gradle 'init' task.
+# https://docs.gradle.org/current/userguide/build_environment.html#sec:gradle_configuration_properties
+
+org.gradle.configuration-cache=false
+org.gradle.console=plain
+org.gradle.logging.level=quiet

ChatApp/gradle/libs.versions.toml

@@ -0,0 +1,10 @@
+# This file was generated by the Gradle 'init' task.
+# https://docs.gradle.org/current/userguide/platforms.html#sub::toml-dependencies-format
+
+[versions]
+guava = "33.3.1-jre"
+junit-jupiter = "5.11.3"
+
+[libraries]
+guava = { module = "com.google.guava:guava", version.ref = "guava" }
+junit-jupiter = { module = "org.junit.jupiter:junit-jupiter", version.ref = "junit-jupiter" }

ChatApp/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.13-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

ChatApp/gradlew

@@ -0,0 +1,251 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

ChatApp/gradlew.bat

@@ -0,0 +1,94 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

ChatApp/settings.gradle

@@ -0,0 +1,14 @@
+/*
+ * This file was generated by the Gradle 'init' task.
+ *
+ * The settings file is used to specify which projects to include in your build.
+ * For more detailed information on multi-project builds, please refer to https://docs.gradle.org/8.13/userguide/multi_project_builds.html in the Gradle documentation.
+ */
+
+plugins {
+    // Apply the foojay-resolver plugin to allow automatic download of JDKs
+    id 'org.gradle.toolchains.foojay-resolver-convention' version '0.9.0'
+}
+
+rootProject.name = 'ChatApp'
+include('app')

ChatApp/src/ChatApp.java

@@ -1,23 +0,0 @@
-import java.net.InetSocketAddress;
-import java.util.Scanner;
-
-import client.Client;
-import server.Server;
-
-public class ChatApp {
-    public static void main(String[] args) throws Exception {
-        Server server = new Server(6665);
-        Client client = new Client(new InetSocketAddress("localhost", 6665));
-
-        client.SendCreateRoom("101");
-
-        Scanner scanner = new Scanner(System.in);
-        while (true) {
-            String message = scanner.nextLine();
-            System.out.print("\033[1A");
-            System.out.print("\r\033[2K");
-            System.out.flush();
-            client.visitMessage(message);
-        }
-    }
-}

ChatApp/src/client/Client.java

@@ -1,118 +0,0 @@
-package client;
-
-import java.io.IOException;
-import java.net.DatagramSocket;
-import java.net.InetSocketAddress;
-import java.net.SocketException;
-import java.util.Objects;
-import java.util.Scanner;
-
-import network.protocol.packets.*;
-
-public class Client {
-
-	private final ClientConnexion connexion;
-
-	public static void main(String[] args) {
-		String host = "localhost";
-		int port = 6665;
-		try {
-			Client client = new Client(new InetSocketAddress(host, port));
-			Scanner scanner = new Scanner(System.in);
-			while(true) {
-				String message = scanner.nextLine();
-				client.visitMessage(message);
-			}
-		} catch (SocketException e) {
-			e.printStackTrace();
-		}
-	}
-
-	public Client(InetSocketAddress serverAddress) throws SocketException {
-		this.connexion = new ClientConnexion(new DatagramSocket(), serverAddress);
-		Scanner scanner = new Scanner(System.in);
-		System.out.println("Enter your pseudo:");
-		String pseudo = scanner.nextLine();
-		login(pseudo);
-	}
-
-	public void visitMessage(String message){
-		try {
-			if(message.startsWith("/")){
-				if(message.startsWith("/createRoom")) {
-					String roomName = message.substring(12).trim();
-					SendCreateRoom(roomName);
-				} else if(message.startsWith("/listRooms")) {
-					RequestRoomList();
-				} else if(message.startsWith("/joinRoom")) {
-					String roomName = message.substring(10).trim();
-					SendJoinRoom(roomName);
-				} else if(message.startsWith("/leaveRoom")) {
-					SendLeaveRoom();
-				} else if(message.startsWith("/help")) {
-					System.out.println("Available commands:");
-					System.out.println("\t/createRoom <roomName>");
-					System.out.println("\t/listRooms");
-					System.out.println("\t/joinRoom <roomName>");
-					System.out.println("\t/leaveRoom");
-					System.out.println("\t/help");
-				}
-				else {
-					System.out.println("Unknown command");
-				}
-			} else {
-				SendChatMessage(message);
-			}
-		} catch (Exception e) {
-			e.printStackTrace();
-		}
-	}
-
-	private void login(String pseudo) {
-		try {
-			this.connexion.sendPacket(new LoginPacket(pseudo));
-		} catch (IOException e) {
-			e.printStackTrace();
-		}
-	}
-
-	public void SendChatMessage(String message) {
-		try {
-			this.connexion.sendPacket(new SendChatMessagePacket(message));
-		} catch (IOException e) {
-			e.printStackTrace();
-		}
-	}
-
-	public void SendCreateRoom(String roomName) {
-		try {
-			this.connexion.sendPacket(new CreateRoomPacket(roomName));
-		} catch (Exception e) {
-			e.printStackTrace();
-		}
-	}
-
-	public void SendJoinRoom(String roomName) {
-		try {
-			this.connexion.sendPacket(new JoinRoomPacket(roomName));
-		} catch (Exception e) {
-			e.printStackTrace();
-		}
-	}
-
-	public void SendLeaveRoom() {
-		try {
-			this.connexion.sendPacket(new LeaveRoomPacket());
-		} catch (Exception e) {
-			e.printStackTrace();
-		}
-	}
-
-	public void RequestRoomList() {
-		try {
-			this.connexion.sendPacket(new RequestRoomListPacket());
-		} catch (Exception e) {
-			e.printStackTrace();
-		}
-	}
-}

ChatApp/src/client/ClientConnexion.java

@@ -1,109 +0,0 @@
-package client;
-
-import java.io.IOException;
-import java.net.DatagramSocket;
-import java.net.InetSocketAddress;
-
-import network.PacketHandler;
-import network.SocketReader;
-import network.SocketWriter;
-import network.protocol.ANSIColor;
-import network.protocol.Packet;
-import network.protocol.PacketVisitor;
-import network.protocol.packets.ChatMessagePacket;
-import network.protocol.packets.CreateRoomPacket;
-import network.protocol.packets.JoinRoomPacket;
-import network.protocol.packets.LeaveRoomPacket;
-import network.protocol.packets.LoginPacket;
-import network.protocol.packets.RequestRoomListPacket;
-import network.protocol.packets.RoomListPacket;
-import network.protocol.packets.SendChatMessagePacket;
-import network.protocol.packets.ServerResponsePacket;
-
-public class ClientConnexion implements PacketVisitor, PacketHandler{
-
-	private final InetSocketAddress serverAddress;
-	private final SocketWriter writer;
-	private final SocketReader reader;
-
-	public ClientConnexion(DatagramSocket socket, InetSocketAddress serverAddress) {
-		this.serverAddress = serverAddress;
-		this.writer = new SocketWriter(socket);
-		this.reader = new SocketReader(socket, this);
-	}
-
-	public void close() {
-		this.reader.stop();
-	}
-
-	public void sendPacket(Packet packet) throws IOException {
-		this.writer.sendPacket(packet, serverAddress);
-	}
-
-	@Override
-	public void handlePacket(Packet packet, InetSocketAddress address) {
-		// we assume that the packet comes from the server
-		visit(packet);
-	}
-
-	@Override
-	public void visitPacket(ChatMessagePacket packet) {
-		StringBuilder sb = new StringBuilder();
-		String time = packet.getTime().toString();
-		sb.append("&y[");
-		sb.append(time, 11, 19); // We only take the HH:MM:SS part
-		sb.append("]&n");
-		sb.append(" ");
-		sb.append(packet.getChatter());
-		sb.append(" : ");
-		sb.append(packet.getContent()).append("&n"); // make the color back to normal at the end of every message
-		System.out.println(ANSIColor.formatString(sb.toString()));
-	}
-
-	@Override
-	public void visitPacket(CreateRoomPacket packet) {
-		throw new UnsupportedOperationException("Unimplemented method 'visitPacket'");
-	}
-
-	@Override
-	public void visitPacket(JoinRoomPacket packet) {
-		throw new UnsupportedOperationException("Unimplemented method 'visitPacket'");
-	}
-
-	@Override
-	public void visitPacket(LeaveRoomPacket packet) {
-		throw new UnsupportedOperationException("Unimplemented method 'visitPacket'");
-	}
-
-	@Override
-	public void visitPacket(LoginPacket packet) {
-		throw new UnsupportedOperationException("Unimplemented method 'visitPacket'");
-	}
-
-	@Override
-	public void visitPacket(RequestRoomListPacket packet) {
-		throw new UnsupportedOperationException("Unimplemented method 'visitPacket'");
-	}
-
-	@Override
-	public void visitPacket(RoomListPacket packet) {
-		System.out.println("Rooms :");
-		for (String room : packet.getRoomNames()) {
-			System.out.println("\t" + room);
-		}
-	}
-
-	@Override
-	public void visitPacket(SendChatMessagePacket packet) {
-		throw new UnsupportedOperationException("Unimplemented method 'visitPacket'");
-	}
-
-	@Override
-	public void visitPacket(ServerResponsePacket packet) {
-		if(packet.getResponse() == ServerResponsePacket.Response.MessageSent || packet.getResponse() == ServerResponsePacket.Response.MessageNotSent) {
-			return;
-		}
-		System.out.println(packet.getResponse());
-	}
-
-}

ChatApp/src/network/SocketReader.java

@@ -1,48 +0,0 @@
-package network;
-
-import java.io.ByteArrayInputStream;
-import java.io.IOException;
-import java.io.ObjectInputStream;
-import java.net.DatagramPacket;
-import java.net.DatagramSocket;
-import java.net.InetSocketAddress;
-
-import network.protocol.Packet;
-
-public class SocketReader {
-
-	private final DatagramSocket socket;
-	private final Thread readThread;
-	private final PacketHandler handler;
-
-	public SocketReader(DatagramSocket socket, PacketHandler handler) {
-		this.socket = socket;
-		this.handler = handler;
-		this.readThread = new Thread(this::readLoop);
-		this.readThread.start();
-	}
-
-	public void stop() {
-		this.readThread.interrupt();
-	}
-
-	private void readLoop() {
-		while (!Thread.interrupted()) {
-			try {
-				byte[] buffer = new byte[65535];
-				DatagramPacket dataPacket = new DatagramPacket(buffer, buffer.length);
-				socket.receive(dataPacket);
-				
-				InetSocketAddress address = new InetSocketAddress(dataPacket.getAddress(), dataPacket.getPort());
-				
-				ObjectInputStream ois = new ObjectInputStream(new ByteArrayInputStream(dataPacket.getData()));
-				Packet packet = (Packet) ois.readObject();
-
-				this.handler.handlePacket(packet, address);
-			} catch (IOException | ClassNotFoundException e) {
-				e.printStackTrace();
-			}
-		}
-	}
-
-}

ChatApp/src/network/SocketWriter.java

@@ -1,30 +0,0 @@
-package network;
-
-import java.io.ByteArrayOutputStream;
-import java.io.IOException;
-import java.io.ObjectOutputStream;
-import java.net.DatagramPacket;
-import java.net.DatagramSocket;
-import java.net.InetSocketAddress;
-
-import network.protocol.Packet;
-
-public class SocketWriter {
-
-	private final DatagramSocket socket;
-
-	public SocketWriter(DatagramSocket socket) {
-		this.socket = socket;
-	}
-
-	public void sendPacket(Packet packet, InetSocketAddress address) throws IOException {
-		ByteArrayOutputStream stream = new ByteArrayOutputStream();
-		ObjectOutputStream oos = new ObjectOutputStream(stream);
-		oos.writeObject(packet);
-		oos.flush();
-		byte[] data = stream.toByteArray();
-		DatagramPacket dataPacket = new DatagramPacket(data, data.length, address.getAddress(),
-				address.getPort());
-		this.socket.send(dataPacket);
-	}
-}

ChatApp/src/server/Server.java

@@ -1,100 +0,0 @@
-package server;
-
-import java.net.DatagramSocket;
-import java.net.InetSocketAddress;
-import java.net.SocketException;
-import java.time.Instant;
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.Map;
-
-import network.PacketHandler;
-import network.SocketReader;
-import network.protocol.Packet;
-import network.protocol.packets.ChatMessagePacket;
-import network.protocol.packets.SendChatMessagePacket;
-
-public class Server implements PacketHandler {
-
-	private final DatagramSocket serverSocket;
-	private final Map<InetSocketAddress, ServerConnexion> connexions;
-	private final SocketReader reader;
-	private final Map<String, ArrayList<ServerConnexion>> roomNames;
-
-	public Server(int port) throws SocketException {
-		this.serverSocket = new DatagramSocket(port);
-		this.connexions = new HashMap<>();
-		this.reader = new SocketReader(serverSocket, this);
-		this.roomNames = new HashMap<>();
-	}
-
-	public ArrayList<String> getRoomNames() {
-		return roomNames.keySet().stream().collect(ArrayList::new, ArrayList::add, ArrayList::addAll);
-	}
-
-	public String getRoomName(ServerConnexion connexion) {
-		for (Map.Entry<String, ArrayList<ServerConnexion>> entry : roomNames.entrySet()) {
-			if(entry.getValue().contains(connexion)) {
-				return entry.getKey();
-			}
-		}
-		return null;
-	}
-
-	public void createRoom(String roomName, ServerConnexion connexion) throws SocketException {
-		if(roomNames.containsKey(roomName)) {
-			throw new SocketException("Room already exists");
-		}
-		roomNames.put(roomName, new ArrayList<>());
-		roomNames.get(roomName).add(connexion);
-	}
-
-	public void leaveRoom(ServerConnexion connexion) throws SocketException {
-		String roomName = getRoomName(connexion);
-		if(roomName != null) {
-			roomNames.get(roomName).remove(connexion);
-			// Remove the room if it is empty
-			if(roomNames.get(roomName).isEmpty()) {
-				roomNames.remove(roomName);
-			}
-			return;
-		}
-		throw new SocketException("Room does not exist");
-	}
-
-	public void joinRoom(String roomName, ServerConnexion connexion) throws SocketException {
-		if(roomNames.containsKey(roomName) && !roomNames.get(roomName).contains(connexion)) {
-			roomNames.get(roomName).add(connexion);
-			return;
-		}
-		throw new SocketException("Room does not exist");
-	}
-
-	public void sendToRoom(ServerConnexion connexion, SendChatMessagePacket packet) throws SocketException {
-		String roomName = getRoomName(connexion);
-		ChatMessagePacket chatPacket = new ChatMessagePacket(Instant.now(), connexion.getChatterName(), packet.getContent());
-		if(roomName != null && roomNames.containsKey(roomName)) {
-			roomNames.get(roomName).forEach(con -> con.sendPacket(chatPacket));
-			return;
-		}
-		throw new SocketException("You are not in a room or the room does not exist");
-	}
-
-	public void close() {
-		this.reader.stop();
-	}
-
-	public boolean hasChatterName(String pseudo) {
-		return this.connexions.values().stream()
-				.anyMatch(connexion -> pseudo.equals(connexion.getChatterName()));
-	}
-
-	@Override
-	public void handlePacket(Packet packet, InetSocketAddress address) {
-		if (!connexions.containsKey(address)) {
-			this.connexions.put(address, new ServerConnexion(this, serverSocket, address));
-		}
-		this.connexions.get(address).visit(packet);
-	}
-
-}

ChatApp/src/server/ServerConnexion.java

@@ -1,121 +0,0 @@
-package server;
-
-import java.io.IOException;
-import java.net.DatagramSocket;
-import java.net.InetSocketAddress;
-import java.net.SocketException;
-
-import network.SocketWriter;
-import network.protocol.Packet;
-import network.protocol.PacketVisitor;
-import network.protocol.packets.ChatMessagePacket;
-import network.protocol.packets.CreateRoomPacket;
-import network.protocol.packets.JoinRoomPacket;
-import network.protocol.packets.LeaveRoomPacket;
-import network.protocol.packets.LoginPacket;
-import network.protocol.packets.RequestRoomListPacket;
-import network.protocol.packets.RoomListPacket;
-import network.protocol.packets.SendChatMessagePacket;
-import network.protocol.packets.ServerResponsePacket;
-import network.protocol.packets.ServerResponsePacket.Response;
-
-public class ServerConnexion implements PacketVisitor {
-
-	private final Server server;
-	private final InetSocketAddress clientAddress;
-	private final SocketWriter writer;
-	private String chatterName;
-
-	public ServerConnexion(Server server, DatagramSocket socket, InetSocketAddress clientAddress) {
-		this.clientAddress = clientAddress;
-		this.server = server;
-		this.writer = new SocketWriter(socket);
-	}
-
-	public String getChatterName() {
-		return this.chatterName;
-	}
-
-	public void sendPacket(Packet packet) {
-		try {
-			this.writer.sendPacket(packet, clientAddress);
-		} catch (IOException e) {
-			e.printStackTrace();
-		}
-	}
-
-	@Override
-	public void visitPacket(ChatMessagePacket packet) {
-		// I'm never supposed to receive this from the client
-		throw new UnsupportedOperationException("Unimplemented method 'visitPacket'");
-	}
-
-	@Override
-	public void visitPacket(CreateRoomPacket packet) {
-		try {
-			server.createRoom(packet.getRoomName(), this);
-			sendPacket(new ServerResponsePacket(Response.RoomCreated));
-		} catch (SocketException e) {
-			sendPacket(new ServerResponsePacket(Response.RoomNotCreated));
-		}
-	}
-
-	@Override
-	public void visitPacket(JoinRoomPacket packet) {
-		try {
-			server.joinRoom(packet.getRoomName(), this);
-			sendPacket(new ServerResponsePacket(Response.RoomJoined));
-		} catch (SocketException e) {
-			sendPacket(new ServerResponsePacket(Response.RoomNotJoined));
-		}
-	}
-
-	@Override
-	public void visitPacket(LeaveRoomPacket packet) {
-		try {
-			server.leaveRoom(this);
-			sendPacket(new ServerResponsePacket(Response.RoomLeft));
-		} catch (SocketException e) {
-			sendPacket(new ServerResponsePacket(Response.RoomNotLeft));
-		}
-	}
-
-	@Override
-	public void visitPacket(LoginPacket packet) {
-		if (server.hasChatterName(packet.getPseudo())) {
-			sendPacket(new ServerResponsePacket(Response.AuthError));
-			return;
-		}
-
-		this.chatterName = packet.getPseudo();
-		sendPacket(new RoomListPacket(server.getRoomNames()));
-		System.out.println("[Server] Chatter " + packet.getPseudo() + " connected !");
-	}
-
-	@Override
-	public void visitPacket(RequestRoomListPacket packet) {
-		sendPacket(new RoomListPacket(server.getRoomNames()));
-	}
-
-	@Override
-	public void visitPacket(RoomListPacket packet) {
-		// I'm never supposed to receive this from the client
-		throw new UnsupportedOperationException("Unimplemented method 'visitPacket'");
-	}
-
-	@Override
-	public void visitPacket(SendChatMessagePacket packet) {
-		try {
-			server.sendToRoom(this, packet);
-		} catch (SocketException e) {
-			sendPacket(new ServerResponsePacket(Response.MessageNotSent));
-		}
-	}
-
-	@Override
-	public void visitPacket(ServerResponsePacket packet) {
-		// I'm never supposed to receive this from the client
-		throw new UnsupportedOperationException("Unimplemented method 'visitPacket'");
-	}
-
-}