add validation to email for save user

user-service-api/src/main/java/br/com/rayankonecny/userserviceapi/controller/exceptions/ControllerExceptionHandler.java

@@ -1,5 +1,6 @@
 package br.com.rayankonecny.userserviceapi.controller.exceptions;
 
+import org.springframework.dao.DataIntegrityViolationException;
 import org.springframework.http.ResponseEntity;
 import org.springframework.validation.FieldError;
 import org.springframework.web.bind.MethodArgumentNotValidException;
@@ -13,6 +14,7 @@ import main.java.models.exceptions.ResourceNotFoundException;
 import main.java.models.exceptions.StandardError;
 
 import static java.time.LocalDateTime.now;
+import static org.springframework.http.HttpStatus.BAD_REQUEST;
 import static org.springframework.http.HttpStatus.NOT_FOUND;
 
 import java.util.ArrayList;
@@ -54,4 +56,18 @@ public class ControllerExceptionHandler {
 
                 return ResponseEntity.badRequest().body(error);
         }
+
+        @ExceptionHandler(DataIntegrityViolationException.class)
+        ResponseEntity<StandardError> handleDataIntegrityViolationException(
+                        final DataIntegrityViolationException ex, final HttpServletRequest request) {
+
+                return ResponseEntity.badRequest().body(
+                                StandardError.builder()
+                                                .timestamp(now())
+                                                .status(BAD_REQUEST.value())
+                                                .error(BAD_REQUEST.getReasonPhrase())
+                                                .message(ex.getMessage())
+                                                .path(request.getRequestURI())
+                                                .build());
+        }
 }

user-service-api/src/main/java/br/com/rayankonecny/userserviceapi/repository/UserRepository.java

@@ -1,10 +1,13 @@
 package br.com.rayankonecny.userserviceapi.repository;
 
+import java.util.Optional;
+
+import br.com.rayankonecny.userserviceapi.entity.User;
 import org.springframework.data.mongodb.repository.MongoRepository;
 import org.springframework.stereotype.Repository;
 
-import br.com.rayankonecny.userserviceapi.entity.User;
-
 @Repository
 public interface UserRepository extends MongoRepository<User, String> {
+
+    Optional<User> findByEmail(final String email);
 }

user-service-api/src/main/java/br/com/rayankonecny/userserviceapi/service/UserService.java

@@ -1,5 +1,6 @@
 package br.com.rayankonecny.userserviceapi.service;
 
+import org.springframework.dao.DataIntegrityViolationException;
 import org.springframework.stereotype.Service;
 
 import br.com.rayankonecny.userserviceapi.mapper.UserMapper;
@@ -23,7 +24,16 @@ public class UserService {
     }
 
     public void save(CreateUserRequest createUserRequest) {
+        verifyIfEmailAlreadyEexists(createUserRequest.email(), null);
         userRepository.save(userMapper.fromRequest(createUserRequest));
     }
 
+    private void verifyIfEmailAlreadyEexists(final String email, final String id) {
+        userRepository.findByEmail(email)
+                .filter(user -> !user.getId().equals(id))
+                .ifPresent(user -> {
+                    throw new DataIntegrityViolationException("Email [" + email + "] already exists");
+                });
+    }
+
 }