feat(DevWeb): Add WebSocket in MainMenu to display user list dynamically

S2/DevWeb/Projet/src/main/java/uppa/project/pojo/json/websocket/Message.java

@@ -0,0 +1,24 @@
+package uppa.project.pojo.json.websocket;
+
+public class Message {
+  private final String type;
+  private final String data;
+
+  public Message(String type, String data) {
+    this.type = type;
+    this.data = data;
+  }
+
+  public String getType() {
+    return type;
+  }
+
+  public String getData() {
+    return data;
+  }
+
+  @Override
+  public String toString() {
+    return "Message{" + "type=" + type + ", data=" + data + '}';
+  }
+}

S2/DevWeb/Projet/src/main/java/uppa/project/servlet/MainMenuServlet.java

@@ -49,7 +49,6 @@ public class MainMenuServlet extends HttpServlet {
     }
     for(HttpSession session : loginsSessions) {
       User connectedUser = (User) session.getAttribute("user");
-      System.out.println(connectedUser.toString());
       if(session.getServletContext().getContextPath().equals(request.getServletContext().getContextPath()) && connectedUser != null && !connectedUser.equals(sessionUser)) {
         connectedUsers.add(connectedUser);
       }

S2/DevWeb/Projet/src/main/java/uppa/project/servlet/RegisterServlet.java

@@ -6,14 +6,12 @@
 
 package uppa.project.servlet;
 
-import jakarta.persistence.EntityManager;
 import jakarta.servlet.ServletException;
 import jakarta.servlet.annotation.WebServlet;
 import jakarta.servlet.http.HttpServlet;
 import jakarta.servlet.http.HttpServletRequest;
 import jakarta.servlet.http.HttpServletResponse;
 import java.io.IOException;
-import uppa.project.provider.EntityManagerProvider;
 
 @WebServlet(name = "registerServlet", value = "/register")
 public class RegisterServlet extends HttpServlet {

S2/DevWeb/Projet/src/main/java/uppa/project/servlet/api/auth/AuthRegisterServlet.java

@@ -18,7 +18,6 @@ import java.io.PrintWriter;
 import java.time.LocalDate;
 import java.time.ZoneId;
 import java.util.Date;
-import java.util.Locale;
 import uppa.project.dao.DAO;
 import uppa.project.dao.DAOException;
 import uppa.project.pojo.User;

S2/DevWeb/Projet/src/main/java/uppa/project/websocket/MainMenuWS.java

@@ -0,0 +1,72 @@
+package uppa.project.websocket;
+
+import com.google.gson.Gson;
+import jakarta.websocket.OnClose;
+import jakarta.websocket.OnError;
+import jakarta.websocket.OnMessage;
+import jakarta.websocket.OnOpen;
+import jakarta.websocket.RemoteEndpoint;
+import jakarta.websocket.Session;
+import jakarta.websocket.server.ServerEndpoint;
+import java.io.IOException;
+import java.util.HashMap;
+import uppa.project.pojo.User;
+import uppa.project.pojo.json.websocket.Message;
+
+@ServerEndpoint(value = "/main-menu")
+public class MainMenuWS {
+
+  private static final HashMap<Session, User> connections = new HashMap<>();
+
+  @OnOpen
+  public void onOpen(Session session) {
+    System.out.println("Connexion WebSocket ouverte : " + session.getId());
+  }
+
+  private void broadcastConnectedUsers() {
+    Gson gson = new Gson();
+    User[] connectedUsers = connections.values().toArray(new User[0]);
+
+    Message websocketObject = new Message("userList", gson.toJson(connectedUsers));
+    String message = gson.toJson(websocketObject);
+
+    System.out.println("Broadcasting connected users : " + message);
+
+    for (Session session : connections.keySet()) {
+      RemoteEndpoint.Basic remote = session.getBasicRemote();
+      try {
+        remote.sendText(message);
+      } catch (IOException e) {
+        e.printStackTrace();
+      }
+    }
+  }
+
+  @OnClose
+  public void onClose(Session session) {
+    System.out.println("Connexion WebSocket fermée : " + session.getId());
+    connections.remove(session);
+  }
+
+  @OnError
+  public void onError(Throwable throwable) {
+    System.out.println("Erreur WebSocket : " + throwable.getMessage());
+    throwable.printStackTrace();
+  }
+
+  @OnMessage
+  public void onMessage(String message, Session session) {
+    Gson gson = new Gson();
+    Message websocketMessage = gson.fromJson(message, Message.class);
+
+    System.out.println("Message reçu : " + websocketMessage);
+
+    if (websocketMessage.getType().equals("linkUserSession")) {
+      User user = gson.fromJson(websocketMessage.getData(), User.class);
+      System.out.println(user);
+
+      connections.put(session, user);
+      broadcastConnectedUsers();
+    }
+  }
+}