feat(user/controller): implementados login y register

src/main/java/com/example/apprecetas/user/infrastructure/controller/AuthController.java

+package com.example.apprecetas.user.infrastructure.controller;
+
+import com.example.apprecetas.exception.UnprocessableEntityException;
+import com.example.apprecetas.security.jwt.JwtTokenProvider;
+import com.example.apprecetas.user.application.CreateUserUseCase;
+import com.example.apprecetas.user.application.ReadUserUseCase;
+import com.example.apprecetas.user.infrastructure.controller.dto.AuthResponse;
+import com.example.apprecetas.user.infrastructure.controller.dto.LoginRequest;
+import com.example.apprecetas.user.infrastructure.controller.dto.UserInputDto;
+import com.example.apprecetas.user.infrastructure.controller.dto.UserOutputDto;
+import com.example.apprecetas.user.infrastructure.mapper.UserMapper;
+import jakarta.validation.Valid;
+import lombok.RequiredArgsConstructor;
+import org.mapstruct.factory.Mappers;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.security.authentication.AuthenticationManager;
+import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
+import org.springframework.security.core.Authentication;
+import org.springframework.security.core.userdetails.UsernameNotFoundException;
+import org.springframework.validation.BindingResult;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.net.URI;
+import java.util.stream.Collectors;
+
+@RestController
+@RequestMapping("/auth")
+@RequiredArgsConstructor
+public class AuthController {
+
+    private final AuthenticationManager authenticationManager;
+    private final JwtTokenProvider jwtTokenProvider;
+    private final ReadUserUseCase readUserService;
+    private final CreateUserUseCase createUserService;
+
+    private final UserMapper mapper = Mappers.getMapper(UserMapper.class);
+
+    @PostMapping("/login")
+    public ResponseEntity<?> login(@RequestBody LoginRequest loginRequest) {
+        try {
+            UserOutputDto userOutputDto = mapper.map(readUserService.readByUsername(loginRequest.getUsername()));
+
+            Authentication authentication = authenticationManager.authenticate(
+                    new UsernamePasswordAuthenticationToken(
+                            loginRequest.getUsername(),
+                            loginRequest.getPassword()
+                    )
+            );
+
+            String token = jwtTokenProvider.generateToken(authentication.getName());
+            return ResponseEntity.ok(new AuthResponse(token));
+        } catch (UsernameNotFoundException e) {
+            return ResponseEntity.status(HttpStatus.UNAUTHORIZED).body("Usuario no encontrado");
+        } catch (Exception e) {
+            return ResponseEntity.status(HttpStatus.UNAUTHORIZED).body("Credenciales no válidas");
+        }
+    }
+
+    @PostMapping("/register")
+    public ResponseEntity<AuthResponse> register(@RequestBody @Valid UserInputDto userInputDto,
+                                                 BindingResult result) {
+        if (result.hasErrors()) {
+            String errorMsg = result.getFieldErrors().stream()
+                    .map(fieldError -> fieldError.getField() + ": " + fieldError.getDefaultMessage())
+                    .collect(Collectors.joining("; "));
+            throw new UnprocessableEntityException(errorMsg);
+        }
+        try {
+            URI location = URI.create("/user");
+            UserOutputDto userOutputDto = mapper.map(createUserService.create(mapper.map(userInputDto)));
+
+            String token = jwtTokenProvider.generateToken(userOutputDto.getUsername());
+
+            return ResponseEntity.created(location).body(new AuthResponse(token));
+        } catch (Exception e) {
+            throw new UnprocessableEntityException("Usuario ya registrado. Cambie sus credenciales.");
+        }
+    }
+
+}