forked from AdvancedProgramming1404/HW-10-Socket-Programming
Develop #1
@@ -2,58 +2,161 @@ package com.university.chat.Server;
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import com.university.chat.Common.ChatMessage;
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import com.university.chat.Common.FileMessage;
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import com.university.chat.Common.MessageType;
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import java.io.IOException;
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import java.io.*;
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import java.net.Socket;
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import java.nio.file.Files;
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import static java.lang.System.in;
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import static java.lang.System.out;
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public class ClientSession implements Runnable {
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private Socket socket;
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public ClientSession(Socket socket) {
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this.socket = socket;
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}
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private String username;
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public ClientSession(Socket socket, UserManager userManager) {
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// TODO : Create an ObjectOutputStream from socket.getOutputStream()
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// and an ObjectInputStream from socket.getInputStream().
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public ClientSession(Socket socket, UserManager userManager) throws IOException {
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try (ObjectOutputStream out = new ObjectOutputStream(socket.getOutputStream())) {
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} catch (IOException e) {
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e.printStackTrace();
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}
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try (ObjectInputStream in = new ObjectInputStream(socket.getInputStream())) {
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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@Override
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public void run() {
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try {
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//Read the first object sent by the client
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try (ObjectOutputStream out = new ObjectOutputStream(socket.getOutputStream());
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ObjectInputStream in = new ObjectInputStream(socket.getInputStream())) {
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// TODO: Welcome the user (login step)
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// 1. Read the first object sent by the client.
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// 2. Check it's a ChatMessage with type LOGIN.
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// 3. Extract the username.
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// 4. Try to register the user via userManager.addUser(...).
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// 5. If the username is taken, send back LOGIN_FAILED and close the socket.
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// 6. Otherwise, create the user's folders with FileManager.createUserFolders(...)
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// and send back LOGIN_SUCCESS.
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out.flush();
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Object firstObject = in.readObject();
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// TODO: Main message loop
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// In a loop, call in.readObject(), you can separate messages by their type:
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// - if it's a ChatMessage -> call handleChatMessage(msg)
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// - if it's a FileMessage -> call handleFileMessage(fileMsg)
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// Keep looping until the connection is closed (an exception will be thrown).
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if (!(firstObject instanceof ChatMessage)) {
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return;
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}
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ChatMessage message = (ChatMessage) firstObject;
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//Check it's a ChatMessage with type LOGIN
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if (message.getType() != MessageType.LOGIN) {
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return;
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}
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//Extract the username
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username = message.getSender();
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//Try to register the user via userManager.addUser(...)
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boolean isRegistered = ChatServer.userManager.addUser(username, this);
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//If the username is taken, send back LOGIN_FAILED and close the socket
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if (!isRegistered) {
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out.writeObject(new ChatMessage(MessageType.LOGIN_FAILED, "ClientSession", username, "Username is already taken."));
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out.flush();
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return;
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}
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//create the user's folders with FileManager.createUserFolders(username)
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FileManager.createUserFolders(username);
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//send back LOGIN_SUCCESS.
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out.writeObject(new ChatMessage(MessageType.LOGIN_SUCCESS, "ClientSession", username, "Username is registered successfully!"));
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out.flush();
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System.out.println(username + " has been successfully registered!");
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while (true) {
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try {
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Object receivedObject = in.readObject();
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if (receivedObject instanceof ChatMessage) {
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handleChatMessage((ChatMessage) receivedObject);
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} else if (receivedObject instanceof FileMessage) {
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handleFileMessage((FileMessage) receivedObject);
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}
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} catch (IOException | ClassNotFoundException e) {
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e.printStackTrace();
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break;
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}
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}
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} catch (Exception e) {
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System.out.println("Disconnected: " + username);
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out.println("Disconnected: " + username);
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} finally {
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// TODO: Remove the user from UserManager so they no longer
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// receive broadcasts or appear in users list
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if (!username.equals("unknown")) {
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ChatServer.userManager.removeUser(username);
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out.println(username + " removed!");
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}
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try {
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socket.close();
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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}
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private void handleChatMessage(ChatMessage msg) throws IOException {
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switch (msg.getType()) {
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//to Broadcast this message to every connected client.
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case PUBLIC_MESSAGE -> {
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// TODO: Broadcast this message to every connected client.
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String sender = msg.getSender();
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String content = msg.getContent();
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for (ClientSession session : ChatServer.userManager.getAllSessions()) {
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try {
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ObjectOutputStream out = new ObjectOutputStream(session.socket.getOutputStream());
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out.writeObject(session);
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out.flush();
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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System.out.println("[PUBLIC] " + msg.getSender() + ": " + msg.getContent());
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}
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//to Forward this message to the receiver user.
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case PRIVATE_MESSAGE -> {
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// TODO: Forward this message to the receiver user.
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String receiver = msg.getReceiver();
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ClientSession receiverSession = ChatServer.userManager.getUser(receiver);
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if (receiverSession != null) {
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try {
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ObjectOutputStream out = new ObjectOutputStream(receiverSession.socket.getOutputStream());
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out.writeObject(receiverSession);
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out.flush();
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} catch (IOException e) {
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e.printStackTrace();
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}
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} else {
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ChatMessage errorMessage = new ChatMessage(MessageType.PRIVATE_MESSAGE, "Server", msg.getSender(), "User" + receiver + " not found.");
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ObjectOutputStream out = new ObjectOutputStream(this.socket.getOutputStream());
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out.writeObject(errorMessage);
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out.flush();
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}
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}
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//to Reply to the requester with the list of online users.
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case USER_LIST -> {
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// TODO: Reply to the requester with the list of online users.
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String onlineUsers = ChatServer.userManager.listUsers();
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ChatMessage message = new ChatMessage(MessageType.USER_LIST, "Server", msg.getSender(), onlineUsers);
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ObjectOutputStream out = new ObjectOutputStream(this.socket.getOutputStream());
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out.writeObject(message);
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out.flush();
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}
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}
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}
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@@ -67,5 +170,21 @@ public class ClientSession implements Runnable {
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Files.write(recvPath, fileMsg.getData());
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// TODO: Forward the received file-message to the destination user.
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String receiverName = fileMsg.getReceiver();
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ClientSession receiverSession = ChatServer.userManager.getUser(receiverName);
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if (receiverSession != null) {
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try {
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ObjectOutputStream out = new ObjectOutputStream(receiverSession.socket.getOutputStream());
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out.writeObject(receiverSession);
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out.flush();
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System.out.println("[FILE] " + fileMsg.getFilename() + " from " + fileMsg.getSender() + " to " + receiverName + " sent.");
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} catch (IOException e) {
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e.printStackTrace();
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}
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} else {
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System.out.println("[FILE] user " + receiverName + " is not online. File saved on server but not sent.");
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}
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}
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}
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