Login and Register with UI

src/main/java/org/to/telegramfinalproject/Server/AuthService.java

@@ -0,0 +1,46 @@
+package org.to.telegramfinalproject.Server;
+
+import java.util.UUID;
+import org.to.telegramfinalproject.Database.userDatabase;
+import org.to.telegramfinalproject.Models.User;
+import org.to.telegramfinalproject.Security.PasswordHashing;
+
+public class AuthService {
+    private final userDatabase userDb = new userDatabase();
+
+    public AuthService() {
+    }
+
+    public boolean register(String user_id, String username, String password, String profile_name) {
+        if (!this.userDb.existsByUsername(username) && !this.userDb.existsByUserId(user_id)) {
+            String passwordRegex = "\\b(?=[^\\s]*[A-Z])(?=[^\\s]*[a-z])(?=[^\\s]*\\d)(?=[^\\s]*[!@#$%^&*])[^\\s]{8,}\\b";
+            if (!password.matches(passwordRegex)) {
+                System.out.println("Password doesn't Valid(At list one capital and one special char(!@#$%^&*), minimum 8 char ");
+                return false;
+            } else {
+                UUID uuid = UUID.randomUUID();
+                password = PasswordHashing.hash(password);
+                User user = new User(user_id, uuid, username, password, profile_name);
+                return this.userDb.save(user);
+            }
+        } else {
+            System.out.println("Username/ user id is already taken");
+            return false;
+        }
+    }
+
+    public User login(String username, String password) {
+        User user = this.userDb.findByUsername(username);
+        if (user == null) {
+            System.out.println("User not found.");
+            return null;
+        } else if (!PasswordHashing.verify(password, user.getPassword())) {
+            System.out.println("Incorrect password");
+            return null;
+        } else {
+            return user;
+        }
+    }
+}
+
+

src/main/java/org/to/telegramfinalproject/Server/ClientHandler.java

@@ -0,0 +1,77 @@
+package org.to.telegramfinalproject.Server;
+
+import org.json.JSONObject;
+import org.to.telegramfinalproject.Models.RequestModel;
+import org.to.telegramfinalproject.Models.ResponseModel;
+import org.to.telegramfinalproject.Models.User;
+
+import java.io.*;
+import java.net.Socket;
+
+public class ClientHandler implements Runnable {
+    private final Socket socket;
+    private final AuthService authService = new AuthService();
+
+    public ClientHandler(Socket socket) {
+        this.socket = socket;
+    }
+
+    @Override
+    public void run() {
+        try (
+                BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
+                PrintWriter out = new PrintWriter(socket.getOutputStream(), true)
+        ) {
+            String inputLine;
+            while ((inputLine = in.readLine()) != null) {
+                JSONObject requestJson = new JSONObject(inputLine);
+
+                RequestModel request = new RequestModel(
+                        requestJson.optString("action"),
+                        requestJson.optString("user_id"),
+                        requestJson.optString("username"),
+                        requestJson.optString("password"),
+                        requestJson.optString("profile_name")
+                );
+
+                ResponseModel response;
+
+                switch (request.getAction()) {
+                    case "register":
+                        boolean registered = authService.register(
+                                request.getUser_id(),
+                                request.getUsername(),
+                                request.getPassword(),
+                                request.getProfile_name()
+                        );
+                        response = registered
+                                ? new ResponseModel("success", "Registration successful.")
+                                : new ResponseModel("error", "Registration failed.");
+                        break;
+
+                    case "login":
+                        User user = authService.login(request.getUsername(), request.getPassword());
+                        response = (user != null)
+                                ? new ResponseModel("success", "Welcome " + user.getProfile_name())
+                                : new ResponseModel("error", "Login failed.");
+                        break;
+
+                    case "logout":
+                        response = new ResponseModel("success", "Logged out.");
+                        break;
+
+                    default:
+                        response = new ResponseModel("error", "Unknown action: " + request.getAction());
+                }
+
+                JSONObject responseJson = new JSONObject();
+                responseJson.put("status", response.getStatus());
+                responseJson.put("message", response.getMessage());
+                out.println(responseJson.toString());
+            }
+
+        } catch (IOException e) {
+            System.out.println("Connection with client lost.");
+        }
+    }
+}

src/main/java/org/to/telegramfinalproject/Server/MainServer.java

@@ -0,0 +1,28 @@
+package org.to.telegramfinalproject.Server;
+
+import java.io.IOException;
+import java.net.ServerSocket;
+import java.net.Socket;
+
+public class MainServer {
+    private static final int PORT = 12345;
+
+    public static void main(String[] args) {
+        try (ServerSocket serverSocket = new ServerSocket(PORT)) {
+            System.out.println("Server started on port " + PORT);
+
+            while (true) {
+                Socket clientSocket = serverSocket.accept();
+                System.out.println("New client connected: " + clientSocket.getInetAddress());
+
+                ClientHandler handler = new ClientHandler(clientSocket);
+                new Thread(handler).start();
+            }
+
+        } catch (IOException e) {
+            System.err.println("Server error: " + e.getMessage());
+            e.printStackTrace();
+        }
+    }
+}
+