feat: 회원가입 Service 메소드 구현

server/src/main/java/com/ticketing/server/user/service/UserServiceImpl.java

@@ -1,9 +1,47 @@
 package com.ticketing.server.user.service;
 
+import com.ticketing.server.user.domain.User;
+import com.ticketing.server.user.domain.UserGrade;
+import com.ticketing.server.user.domain.repository.UserRepository;
+import com.ticketing.server.user.exception.DuplicateEmailException;
+import com.ticketing.server.user.service.dto.SignUp;
 import com.ticketing.server.user.service.interfaces.UserService;
+import java.util.Optional;
+import javax.validation.Valid;
+import lombok.RequiredArgsConstructor;
+import org.springframework.security.crypto.password.PasswordEncoder;
 import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+import org.springframework.validation.annotation.Validated;
 
 @Service
+@RequiredArgsConstructor
+@Transactional(readOnly = true)
+@Validated
 public class UserServiceImpl implements UserService {
 
+	private final PasswordEncoder passwordEncoder;
+	private final UserRepository userRepository;
+
+	@Transactional
+	public User register(@Valid SignUp signUpDto) {
+		validateEmail(signUpDto.getEmail());
+
+		User user = new User(signUpDto.getName(),
+			signUpDto.getEmail(),
+			signUpDto.encodePassword(passwordEncoder),
+			UserGrade.GUEST,
+			signUpDto.getPhone());
+
+		return userRepository.save(user);
+	}
+
+	private void validateEmail(String email) {
+		Optional<User> user = userRepository.findByEmail(email);
+
+		if (user.isPresent()) {
+			throw new DuplicateEmailException(email);
+		}
+	}
+
 }

server/src/main/java/com/ticketing/server/user/service/interfaces/UserService.java

@@ -1,5 +1,10 @@
 package com.ticketing.server.user.service.interfaces;
 
+import com.ticketing.server.user.domain.User;
+import com.ticketing.server.user.service.dto.SignUp;
+
 public interface UserService {
 
+	User register(SignUp signUpDto);
+
 }