Merge pull request 'complet' (#1) from develop into main

Reviewed-on: amirmohammad/HW-10-Socket-Programming#1

100 / 100

src/main/java/com/university/chat/Client/ServerListener.java

@@ -1,19 +1,33 @@
 package com.university.chat.Client;
 
-public class ServerListener implements Runnable{
+import com.university.chat.Common.ChatMessage;
-    // TODO: store the ObjectInputStream from the user socket
+import com.university.chat.Common.FileMessage;
-    //          (this should be the same input stream the
+
-    //           chatClient created when connecting)
+import java.io.ObjectInputStream;
+
+public class ServerListener implements Runnable {
+
+    private  ObjectInputStream in;
+
+    public ServerListener(ObjectInputStream in) {
+        this.in = in;
+    }
 
     @Override
     public void run() {
         try {
-            // TODO: In an infinite loop read objects from the server
+            while (true) {
-            //   - if it's a ChatMessage  -> print "<sender>: <content>"
+                Object obj = in.readObject();
-            //   - if it's a FileMessage  -> print that a file was received
+
-            //                               (filename + sender), it's already
+                if (obj instanceof ChatMessage chatMessage) {
-            //                               saved to disk by the server.
+                    System.out.println( chatMessage.getSender() +  ": " + chatMessage.getContent());
-        } catch (Exception e){
+                }
+
+                else if (obj instanceof FileMessage fileMessage) {
+                    System.out.println( "File received: " + fileMessage.getFilename() +  " from " +  fileMessage.getSender());
+                }
+            }
+        } catch (Exception e) {
             System.out.println("Disconnected from server");
         }
     }

src/main/java/com/university/chat/Client/chatClient.java

@@ -1,29 +1,111 @@
 package com.university.chat.Client;
 
+import com.university.chat.Common.ChatMessage;
+import com.university.chat.Common.FileMessage;
+import com.university.chat.Common.MessageType;
+
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.net.Socket;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.Scanner;
+
 public class chatClient {
     public static void main() {
-        // TODO: Connecting to the server
-        //  1. Create a socket and connect to the server
-        //  2. Create an ObjectOutputStream (out) and ObjectInputStream (in)
-        //      from the socket's streams — output FIRST, then input.
-        //  2. Get the username, and send a LOGIN ChatMessage with that username
-        //  3. Start a new Thread running a ServerListener(in) so incoming
-        //      messages are handled concurrently.
-
-        while (true){
         try {
-                // TODO: Program loop — read a line from the console and act on it:
+            Socket socket = new Socket("localhost", 5000);
-                //   - "/msg <user> <text>"        -> build & send a PRIVATE_MESSAGE
+
-                //   - "/users"                    -> build & send a USER_LIST request
+            ObjectOutputStream out = new ObjectOutputStream(socket.getOutputStream());
-                //   - "/sendfile <user> <path>"   -> read the file into a byte[]
+
-                //                                     (you can use TransferProgress
+            ObjectInputStream in = new ObjectInputStream(socket.getInputStream());
-                //                                     to show progress)
+
-                //                                     and send it as a FileMessage
+            Scanner scanner = new Scanner(System.in);
-                //   - anything else               -> send a PUBLIC_MESSAGE
+
-                //   Remember to flush() the output stream after writeObject().
+            System.out.print("Username: ");
-            } catch (Exception e){
+            String username = scanner.nextLine();
-                System.out.println("command failed: " + e.getMessage());
+
+            ChatMessage loginMessage = new ChatMessage(MessageType.LOGIN, username, null, null);
+
+            out.writeObject(loginMessage);
+            out.flush();
+
+            Thread listener = new Thread(new ServerListener(in));
+
+            listener.start();
+
+            while (true) {
+
+                try {
+                    String line = scanner.nextLine();
+
+                    if (line.startsWith("/msg ")) {
+
+                        String[] parts = line.split(" ", 3);
+
+                        if (parts.length < 3) {
+                            System.out.println("Usage: /msg <user> <message>");
+                            continue;
                         }
+
+                        ChatMessage privateMessage = new ChatMessage( MessageType.PRIVATE_MESSAGE, username, parts[1], parts[2]);
+
+                        out.writeObject(privateMessage);
+                        out.flush();
+                    }
+
+                    else if (line.equals("/users")) {
+
+                        ChatMessage userListRequest = new ChatMessage(MessageType.USER_LIST, username, null, null);
+
+                        out.writeObject(userListRequest);
+                        out.flush();
+                    }
+
+                    else if (line.startsWith("/sendfile ")) {
+
+                        String[] parts = line.split(" ", 3);
+
+                        if (parts.length < 3) {
+                            System.out.println("Usage: /sendfile <user> <path>");
+                            continue;
+                        }
+
+                        String receiver = parts[1];
+                        String filePath = parts[2];
+
+                        Path path = Paths.get(filePath);
+
+                        byte[] data = Files.readAllBytes(path);
+
+                        FileMessage fileMessage = new FileMessage(username, receiver, path.getFileName().toString(), data);
+
+                        out.writeObject(fileMessage);
+                        out.flush();
+
+                        System.out.println("File sent.");
+                    }
+
+                    else {
+
+                        ChatMessage publicMessage = new ChatMessage(MessageType.PUBLIC_MESSAGE, username, null, line);
+
+                        out.writeObject(publicMessage);
+                        out.flush();
+                    }
+
+                } catch (Exception e) {
+                    System.out.println(
+                            "command failed: " + e.getMessage()
+                    );
+                }
+            }
+
+        } catch (Exception e) {
+            System.out.println(
+                    "Could not connect to server: " + e.getMessage()
+            );
         }
     }
 }

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

@@ -1,15 +1,49 @@
 package com.university.chat.Server;
 
+import java.net.ServerSocket;
+import java.net.Socket;
+
 public class ChatServer {
-    // TODO: declare a single shared UserManager instance (static final)
+
-    //         This MUST be shared by all ClientSession threads so that
+    private static final UserManager USER_MANAGER =
-    //         broadcasting and private messaging work correctly.
+            new UserManager();
+
+    private static final int PORT = 5000;
 
     public static void main(String[] args) {
-        // TODO: Create a ServerSocket
 
-        // TODO: In an infinite loop:
+        try (ServerSocket serverSocket =
-        //  accept an incoming client connection
+                     new ServerSocket(PORT)) {
-        //  make a new thread running ClientSession for each user.
+
+            System.out.println(
+                    "Server started on port " + PORT
+            );
+
+            while (true) {
+
+                Socket clientSocket =
+                        serverSocket.accept();
+
+                System.out.println(
+                        "New client connected: "
+                                + clientSocket.getInetAddress()
+                );
+
+                ClientSession session = new ClientSession(clientSocket, USER_MANAGER);
+
+                Thread thread =
+                        new Thread(session);
+
+                thread.start();
+            }
+
+        } catch (Exception e) {
+
+            System.out.println(
+                    "Server error: " + e.getMessage()
+            );
+
+            e.printStackTrace();
+        }
     }
 }

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

@@ -2,70 +2,185 @@ 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 String username;
+    private Socket socket;
+    private UserManager userManager;
+
+    private ObjectInputStream in;
+    private ObjectOutputStream out;
 
     public ClientSession(Socket socket, UserManager userManager) {
-        // TODO : Create an ObjectOutputStream from socket.getOutputStream()
+        this.socket = socket;
-        //         and an ObjectInputStream from socket.getInputStream().
+        this.userManager = userManager;
+
+        try {
+            out = new ObjectOutputStream(socket.getOutputStream());
+            in = new ObjectInputStream(socket.getInputStream());
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
     }
 
     @Override
     public void run() {
+
         try {
 
-            // TODO: Welcome the user (login step)
+            Object obj = in.readObject();
-            //  1. Read the first object sent by the client.
-            //  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 (!(obj instanceof ChatMessage)) {
-            //   In a loop, call in.readObject(), you can separate messages by their type:
+                socket.close();
-            //     - if it's a ChatMessage      -> call handleChatMessage(msg)
+                return;
-            //     - if it's a FileMessage      -> call handleFileMessage(fileMsg)
+            }
-            //   Keep looping until the connection is closed (an exception will be thrown).
+
+            ChatMessage loginMsg = (ChatMessage) obj;
+
+            if (loginMsg.getType() != MessageType.LOGIN) {
+                socket.close();
+                return;
+            }
+
+            username = loginMsg.getSender();
+
+            boolean added =
+                    userManager.addUser(username, this);
+
+            if (!added) {
+
+                ChatMessage fail = new ChatMessage(MessageType.LOGIN_FAILED, "SERVER", username, "Username already exists");
+
+                send(fail);
+
+                socket.close();
+                return;
+            }
+
+            FileManager.createUserFolders(username);
+
+            ChatMessage success = new ChatMessage(MessageType.LOGIN_SUCCESS, "SERVER", username, "Login successful");
+
+            send(success);
+
+            while (true) {
+
+                Object message = in.readObject();
+
+                if (message instanceof ChatMessage) {
+
+                    handleChatMessage(
+                            (ChatMessage) message
+                    );
+
+                } else if (message instanceof FileMessage) {
+
+                    handleFileMessage(
+                            (FileMessage) message
+                    );
+                }
+            }
 
         } catch (Exception e) {
-            System.out.println("Disconnected: " + username);
+
+            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) {
+            }
         }
     }
 
+    private void handleChatMessage(ChatMessage msg)
+            throws IOException {
 
-    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.send(msg);
                 }
+            }
+
             case PRIVATE_MESSAGE -> {
-                // TODO: Forward this message to the receiver user.
+
+                ClientSession receiver =
+                        userManager.getUser(
+                                msg.getReceiver()
+                        );
+
+                if (receiver != null) {
+                    receiver.send(msg);
                 }
+            }
+
             case USER_LIST -> {
-                // TODO: Reply to the requester with the list of online users.
+
+                ChatMessage reply =
+                        new ChatMessage(
+                                MessageType.USER_LIST,
+                                "SERVER",
+                                username,
+                                userManager.listUsers()
+                        );
+
+                send(reply);
             }
         }
     }
 
-    private void handleFileMessage(FileMessage fileMsg) throws IOException {
+    private void handleFileMessage(FileMessage fileMsg)
-        // Storing the file
+            throws IOException {
-        var sentPath = FileManager.getSentPath(fileMsg.getSender(), fileMsg.getFilename());
+
-        var recvPath = FileManager.getReceivedPath(fileMsg.getReceiver(), fileMsg.getFilename());
+        var sentPath =
+                FileManager.getSentPath(
+                        fileMsg.getSender(),
+                        fileMsg.getFilename()
+                );
+
+        var recvPath =
+                FileManager.getReceivedPath(
+                        fileMsg.getReceiver(),
+                        fileMsg.getFilename()
+                );
 
         Files.write(sentPath, fileMsg.getData());
         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.send(fileMsg);
+        }
+    }
+
+    public synchronized void send(Object obj)
+            throws IOException {
+
+        out.writeObject(obj);
+        out.flush();
     }
 }