ClientSession completed.

src/main/java/com/university/chat/Server/ClientSession.java

@@ -2,58 +2,161 @@ package com.university.chat.Server;
 
 import com.university.chat.Common.ChatMessage;
 import com.university.chat.Common.FileMessage;
+import com.university.chat.Common.MessageType;
 
-import java.io.IOException;
+import java.io.*;
 import java.net.Socket;
 import java.nio.file.Files;
 
+import static java.lang.System.in;
+import static java.lang.System.out;
+
 public class ClientSession implements Runnable {
+    private Socket socket;
+
+    public ClientSession(Socket socket) {
+        this.socket = socket;
+    }
 
     private String username;
 
-    public ClientSession(Socket socket, UserManager userManager) {
+    public ClientSession(Socket socket, UserManager userManager) throws IOException {
-        // TODO : Create an ObjectOutputStream from socket.getOutputStream()
+
-        //         and an ObjectInputStream from socket.getInputStream().
+        try (ObjectOutputStream out = new ObjectOutputStream(socket.getOutputStream())) {
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+
+        try (ObjectInputStream in = new ObjectInputStream(socket.getInputStream())) {
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
     }
 
     @Override
     public void run() {
-        try {
+        //Read the first object sent by the client
+        try (ObjectOutputStream out = new ObjectOutputStream(socket.getOutputStream());
+             ObjectInputStream in = new ObjectInputStream(socket.getInputStream())) {
 
-            // TODO: Welcome the user (login step)
+            out.flush();
-            //  1. Read the first object sent by the client.
+            Object firstObject = in.readObject();
-            //  2. Check it's a ChatMessage with type LOGIN.
-            //  3. Extract the username.
-            //  4. Try to register the user via userManager.addUser(...).
-            //  5. If the username is taken, send back LOGIN_FAILED and close the socket.
-            //  6. Otherwise, create the user's folders with FileManager.createUserFolders(...)
-            //      and send back LOGIN_SUCCESS.
 
-            // TODO: Main message loop
+            if (!(firstObject instanceof ChatMessage)) {
-            //   In a loop, call in.readObject(), you can separate messages by their type:
+                return;
-            //     - if it's a ChatMessage      -> call handleChatMessage(msg)
+            }
-            //     - if it's a FileMessage      -> call handleFileMessage(fileMsg)
-            //   Keep looping until the connection is closed (an exception will be thrown).
 
+            ChatMessage message = (ChatMessage) firstObject;
+
+            //Check it's a ChatMessage with type LOGIN
+            if (message.getType() != MessageType.LOGIN) {
+                return;
+            }
+
+            //Extract the username
+            username = message.getSender();
+
+            //Try to register the user via userManager.addUser(...)
+            boolean isRegistered = ChatServer.userManager.addUser(username, this);
+
+            //If the username is taken, send back LOGIN_FAILED and close the socket
+            if (!isRegistered) {
+                out.writeObject(new ChatMessage(MessageType.LOGIN_FAILED, "ClientSession", username, "Username is already taken."));
+                out.flush();
+                return;
+            }
+
+            //create the user's folders with FileManager.createUserFolders(username)
+            FileManager.createUserFolders(username);
+
+            //send back LOGIN_SUCCESS.
+            out.writeObject(new ChatMessage(MessageType.LOGIN_SUCCESS, "ClientSession", username, "Username is registered successfully!"));
+            out.flush();
+
+            System.out.println(username + " has been successfully registered!");
+
+            while (true) {
+                try {
+                    Object receivedObject = in.readObject();
+
+                    if (receivedObject instanceof ChatMessage) {
+                        handleChatMessage((ChatMessage) receivedObject);
+                    } else if (receivedObject instanceof FileMessage) {
+                        handleFileMessage((FileMessage) receivedObject);
+                    }
+                } catch (IOException | ClassNotFoundException e) {
+                    e.printStackTrace();
+                    break;
+                }
+            }
         } catch (Exception e) {
-            System.out.println("Disconnected: " + username);
+            out.println("Disconnected: " + username);
         } finally {
-            // TODO: Remove the user from UserManager so they no longer
+            if (!username.equals("unknown")) {
-            //        receive broadcasts or appear in users list
+                ChatServer.userManager.removeUser(username);
+                out.println(username + " removed!");
+            }
+
+            try  {
+                socket.close();
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
         }
     }
 
 
     private void handleChatMessage(ChatMessage msg) throws IOException {
         switch (msg.getType()) {
+
+            //to Broadcast this message to every connected client.
             case PUBLIC_MESSAGE -> {
-                // TODO: Broadcast this message to every connected client.
+                String sender = msg.getSender();
+                String content = msg.getContent();
+
+                for (ClientSession session : ChatServer.userManager.getAllSessions()) {
+                    try {
+                        ObjectOutputStream out = new ObjectOutputStream(session.socket.getOutputStream());
+                        out.writeObject(session);
+                        out.flush();
+                    } catch (IOException e) {
+                        e.printStackTrace();
+                    }
+                }
+
+                System.out.println("[PUBLIC] " + msg.getSender() + ": " + msg.getContent());
             }
+
+            //to Forward this message to the receiver user.
             case PRIVATE_MESSAGE -> {
-                // TODO: Forward this message to the receiver user.
+                String receiver = msg.getReceiver();
+                ClientSession receiverSession = ChatServer.userManager.getUser(receiver);
+
+                if (receiverSession != null) {
+                    try {
+                        ObjectOutputStream out = new ObjectOutputStream(receiverSession.socket.getOutputStream());
+                        out.writeObject(receiverSession);
+                        out.flush();
+                    } catch (IOException e) {
+                        e.printStackTrace();
+                    }
+                } else {
+                    ChatMessage errorMessage =  new ChatMessage(MessageType.PRIVATE_MESSAGE, "Server", msg.getSender(), "User" + receiver + " not found.");
+
+                    ObjectOutputStream out = new ObjectOutputStream(this.socket.getOutputStream());
+                    out.writeObject(errorMessage);
+                    out.flush();
+                }
             }
+
+            //to Reply to the requester with the list of online users.
             case USER_LIST -> {
-                // TODO: Reply to the requester with the list of online users.
+                String onlineUsers = ChatServer.userManager.listUsers();
+                ChatMessage message = new ChatMessage(MessageType.USER_LIST, "Server", msg.getSender(), onlineUsers);
+
+                ObjectOutputStream out = new ObjectOutputStream(this.socket.getOutputStream());
+                out.writeObject(message);
+                out.flush();
             }
         }
     }
@@ -67,5 +170,21 @@ public class ClientSession implements Runnable {
         Files.write(recvPath, fileMsg.getData());
 
         // TODO: Forward the received file-message to the destination user.
+        String receiverName = fileMsg.getReceiver();
+        ClientSession receiverSession = ChatServer.userManager.getUser(receiverName);
+
+        if (receiverSession != null) {
+            try {
+                ObjectOutputStream out = new ObjectOutputStream(receiverSession.socket.getOutputStream());
+                out.writeObject(receiverSession);
+                out.flush();
+
+                System.out.println("[FILE] " + fileMsg.getFilename() + " from " + fileMsg.getSender() + " to " + receiverName + " sent.");
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+        } else {
+            System.out.println("[FILE] user " + receiverName + " is not online. File saved on server but not sent.");
+        }
     }
 }