Refactor and secure backend configuration, DTOs, and authentication flow

- Updated pom.xml: removed redundant tags, grouped dependencies, added scopes, and upgraded plugins
- Enhanced RegisterUserDto with validation annotations and added missing fields (username, fullname)
- Updated User entity with builder constructor and removed redundant getters/setters
- Completed FileMetadata entity with Lombok and required setters/getters
- Improved HDFSConfig with correct annotation and clearer exception message
- Adjusted HTTP to HTTPS redirect port (8085 -> 8443)
- Allowed /actuator/** in SecurityConfig and disabled deprecated XSS protection
- Skipped JWT filter for /api/auth and /actuator paths
- Refactored AuthenticationService to use builder pattern and RSA key injection
- Fixed application.properties for static MySQL connection (removed ${MYSQL_PASSWORD})

src/main/java/com/skycrate/backend/skycrateBackend/services/AuthenticationService.java

@@ -1,15 +1,14 @@
 package com.skycrate.backend.skycrateBackend.services;
 
-import org.springframework.security.authentication.AuthenticationManager;
-import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
-import org.springframework.security.crypto.password.PasswordEncoder;
-import org.springframework.stereotype.Service;
-
 import com.skycrate.backend.skycrateBackend.dto.LoginUserDto;
 import com.skycrate.backend.skycrateBackend.dto.RegisterUserDto;
 import com.skycrate.backend.skycrateBackend.entity.User;
 import com.skycrate.backend.skycrateBackend.repository.UserRepository;
 import com.skycrate.backend.skycrateBackend.utils.RSAKeyUtil;
+import org.springframework.security.authentication.AuthenticationManager;
+import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
+import org.springframework.security.crypto.password.PasswordEncoder;
+import org.springframework.stereotype.Service;
 
 import java.security.KeyPair;
 import java.security.NoSuchAlgorithmException;
@@ -21,28 +20,31 @@ public class AuthenticationService {
     private final PasswordEncoder passwordEncoder;
     private final AuthenticationManager authenticationManager;
 
-    public AuthenticationService(UserRepository userRepository, AuthenticationManager authenticationManager, PasswordEncoder passwordEncoder) {
+    public AuthenticationService(UserRepository userRepository,
+                                 AuthenticationManager authenticationManager,
+                                 PasswordEncoder passwordEncoder) {
         this.userRepository = userRepository;
         this.passwordEncoder = passwordEncoder;
         this.authenticationManager = authenticationManager;
     }
 
     public User signUp(RegisterUserDto inputUser) {
-        User user = new User(
-                inputUser.getFirstname(),
-                inputUser.getLastname(),
-                inputUser.getEmail(),
-                passwordEncoder.encode(inputUser.getPassword())
-        );
-
+        KeyPair keyPair;
         try {
-            KeyPair keyPair = RSAKeyUtil.generateKeyPair();
-            user.setPublicKey(keyPair.getPublic().getEncoded());
-            user.setPrivateKey(keyPair.getPrivate().getEncoded());
+            keyPair = RSAKeyUtil.generateKeyPair();
         } catch (NoSuchAlgorithmException e) {
             throw new RuntimeException("Failed to generate RSA key pair", e);
         }
 
+        User user = User.builder()
+                .fullname(inputUser.getFirstname() + " " + inputUser.getLastname())
+                .username(inputUser.getUsername())
+                .email(inputUser.getEmail())
+                .password(passwordEncoder.encode(inputUser.getPassword()))
+                .publicKey(keyPair.getPublic().getEncoded())
+                .privateKey(keyPair.getPrivate().getEncoded())
+                .build();
+
         return userRepository.save(user);
     }