Configured Authentication Controller and Service.

Author: alwinsimon

src/main/java/com/alwinsimon/UserManagementJavaSpringBoot/Controller/AuthenticationController.java

@@ -3,6 +3,7 @@
 import com.alwinsimon.UserManagementJavaSpringBoot.Config.Auth.AuthenticationRequest;
 import com.alwinsimon.UserManagementJavaSpringBoot.Config.Auth.AuthenticationResponse;
 import com.alwinsimon.UserManagementJavaSpringBoot.Config.Auth.RegisterRequest;
+import com.alwinsimon.UserManagementJavaSpringBoot.Service.AuthenticationService;
 import lombok.RequiredArgsConstructor;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.PostMapping;
@@ -15,18 +16,24 @@
 @RequiredArgsConstructor
 public class AuthenticationController {
 
+    private final AuthenticationService authenticationService;
+
     @PostMapping("/register")
     public ResponseEntity<AuthenticationResponse> register(
             @RequestBody RegisterRequest request
     ) {
-        //
+
+        return ResponseEntity.ok(authenticationService.register(request));
+
     }
 
     @PostMapping("/authenticate")
     public ResponseEntity<AuthenticationResponse> authenticate(
             @RequestBody AuthenticationRequest request
     ) {
-        //
+
+        return ResponseEntity.ok(authenticationService.authenticate(request));
+
     }
 
 }

src/main/java/com/alwinsimon/UserManagementJavaSpringBoot/Service/AuthenticationService.java

@@ -0,0 +1,75 @@
+package com.alwinsimon.UserManagementJavaSpringBoot.Service;
+
+import com.alwinsimon.UserManagementJavaSpringBoot.Config.Auth.AuthenticationRequest;
+import com.alwinsimon.UserManagementJavaSpringBoot.Config.Auth.AuthenticationResponse;
+import com.alwinsimon.UserManagementJavaSpringBoot.Config.Auth.RegisterRequest;
+import com.alwinsimon.UserManagementJavaSpringBoot.Model.Role;
+import com.alwinsimon.UserManagementJavaSpringBoot.Model.User;
+import com.alwinsimon.UserManagementJavaSpringBoot.Repository.UserRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.security.authentication.AuthenticationManager;
+import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
+import org.springframework.security.core.userdetails.UsernameNotFoundException;
+import org.springframework.security.crypto.password.PasswordEncoder;
+import org.springframework.stereotype.Service;
+
+@Service
+@RequiredArgsConstructor
+public class AuthenticationService {
+
+    private final UserRepository userRepository;
+    private final PasswordEncoder passwordEncoder;
+    private final JwtService jwtService;
+    private final AuthenticationManager authenticationManager;
+
+    public AuthenticationResponse register(RegisterRequest request) {
+
+        // Build a user using builder in user model.
+        var user = User.builder()
+                .name(request.getName())
+                .gender(request.getGender())
+                .email(request.getEmail())
+                .password(passwordEncoder.encode(request.getPassword()))
+                .role(Role.USER)
+                .build();
+
+        // Save User to DB using UserRepository
+        userRepository.save(user);
+
+        // Generate a JWT Token to return along with Response.
+        var jwtToken = jwtService.generateJwtToken(user);
+
+        return AuthenticationResponse.builder()
+                .token(jwtToken)
+                .build();
+
+    }
+
+    public AuthenticationResponse authenticate(AuthenticationRequest request) {
+
+        // Try Authenticating user with Authentication Manager
+        authenticationManager.authenticate(
+                new UsernamePasswordAuthenticationToken(
+                        request.getEmail(),
+                        request.getPassword()
+                )
+        );
+
+        /**
+         * If the authentication manager authenticated user without throwing any exception
+         * Find user and generate auth token
+         * Send auth token back to user.
+         */
+
+        var user = userRepository.findByEmail(request.getEmail())
+                .orElseThrow(() -> new UsernameNotFoundException("User not found."));
+
+        // Generate a JWT Token to return along with Response.
+        var jwtToken = jwtService.generateJwtToken(user);
+
+        return AuthenticationResponse.builder()
+                .token(jwtToken)
+                .build();
+
+    }
+}