diff --git a/src/main/java/com/university/chat/Server/ClientSession.java b/src/main/java/com/university/chat/Server/ClientSession.java index f09d64a..0daa8ee 100644 --- a/src/main/java/com/university/chat/Server/ClientSession.java +++ b/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) { - // TODO : Create an ObjectOutputStream from socket.getOutputStream() - // and an ObjectInputStream from socket.getInputStream(). + public ClientSession(Socket socket, UserManager userManager) throws IOException { + + 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) - // 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. + out.flush(); + Object firstObject = in.readObject(); - // 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). + if (!(firstObject instanceof ChatMessage)) { + return; + } + 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 - // receive broadcasts or appear in users list + if (!username.equals("unknown")) { + 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."); + } } } \ No newline at end of file