HW10

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

@@ -2,18 +2,34 @@ 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.ObjectInputStream;
+import java.io.ObjectOutputStream;
 import java.net.Socket;
 import java.nio.file.Files;
 
 public class ClientSession implements Runnable {
 
+    private final Socket socket;
+    private final UserManager userManager;
+    private ObjectOutputStream out;
+    private ObjectInputStream in;
+
     private String username;
 
     public ClientSession(Socket socket, UserManager userManager) {
         // TODO : Create an ObjectOutputStream from socket.getOutputStream()
         //         and an ObjectInputStream from socket.getInputStream().
+        this.socket = socket;
+        this.userManager = userManager;
+        try {
+            this.out = new ObjectOutputStream(socket.getOutputStream());
+            this.in = new ObjectInputStream(socket.getInputStream());
+        } catch (IOException e) {
+            System.out.println("Failed to open streams: " + e.getMessage());
+        }
     }
 
     @Override
@@ -28,32 +44,81 @@ public class ClientSession implements Runnable {
             //  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.
+            Object first = in.readObject();
+            if (!(first instanceof ChatMessage loginMsg) || loginMsg.getType() != MessageType.LOGIN) {
+                sendMessage(new ChatMessage(MessageType.LOGIN_FAILED, "server", null, "Expected LOGIN message"));
+                socket.close();
+                return;
+            }
+
+            username = loginMsg.getSender();
+
+            if (!userManager.addUser(username, this)) {
+                sendMessage(new ChatMessage(MessageType.LOGIN_FAILED, "server", username, "Username already taken"));
+                socket.close();
+                return;
+            }
+
+            FileManager.createUserFolders(username);
+            sendMessage(new ChatMessage(MessageType.LOGIN_SUCCESS, "server", username, "Welcome, " + username + "!"));
 
             // TODO: Main message loop
             //   In a loop, call in.readObject(), you can separate messages by their type:
             //     - 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).
+            while (true) {
+                Object obj = in.readObject();
+                if (obj instanceof ChatMessage msg) {
+                    handleChatMessage(msg);
+                } else if (obj instanceof FileMessage fileMsg) {
+                    handleFileMessage(fileMsg);
+                }
+            }
 
         } catch (Exception e) {
             System.out.println("Disconnected: " + username);
         } finally {
             // TODO: Remove the user from UserManager so they no longer
             //        receive broadcasts or appear in users list
+            if (username != null) {
+                userManager.removeUser(username);
+            }
+            try {
+                socket.close();
+            } catch (IOException ignored) {
+            }
         }
     }
 
+    public synchronized void sendMessage(Object obj) throws IOException {
+        out.writeObject(obj);
+        out.flush();
+    }
 
     private void handleChatMessage(ChatMessage msg) throws IOException {
         switch (msg.getType()) {
             case PUBLIC_MESSAGE -> {
                 // TODO: Broadcast this message to every connected client.
+                for (ClientSession session : userManager.getAllSessions()) {
+                    session.sendMessage(msg);
+                }
             }
             case PRIVATE_MESSAGE -> {
                 // TODO: Forward this message to the receiver user.
+                ClientSession receiver = userManager.getUser(msg.getReceiver());
+                if (receiver != null) {
+                    receiver.sendMessage(msg);
+                } else {
+                    sendMessage(new ChatMessage(MessageType.PRIVATE_MESSAGE, "server", username,
+                            "User '" + msg.getReceiver() + "' is not online."));
+                }
             }
             case USER_LIST -> {
                 // TODO: Reply to the requester with the list of online users.
+                sendMessage(new ChatMessage(MessageType.USER_LIST, "server", username, userManager.listUsers()));
+            }
+            default -> {
             }
         }
     }
@@ -67,5 +132,9 @@ public class ClientSession implements Runnable {
         Files.write(recvPath, fileMsg.getData());
 
         // TODO: Forward the received file-message to the destination user.
+        ClientSession receiver = userManager.getUser(fileMsg.getReceiver());
+        if (receiver != null) {
+            receiver.sendMessage(fileMsg);
+        }
     }
 }