최종 변경 : 2023.11.11

회원 중복 검증

username에 대해서 중복된 가입이 발생하면 서비스에서 아주 치명적인 문제가 발생하기 때문에 백엔드단에서 중복 검증과 중복 방지 로직을 작성해야 한다.

UserEntity Unique 설정

package com.example.testsecurity.entity;

import jakarta.persistence.*;
import lombok.Getter;
import lombok.Setter;

@Entity
@Setter
@Getter
public class UserEntity {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int id;

    @Column(unique = true)
    private String username;
    private String password;

    private String role;
}

JoinService 중복 검증

• UserRepository

  package com.example.testsecurity.repository;
  
  import com.example.testsecurity.entity.UserEntity;
  import org.springframework.data.jpa.repository.JpaRepository;
  
  public interface UserRepository extends JpaRepository<UserEntity, Integer> {
  
      boolean existsByUsername(String username);
  }
  

• JoinService

  package com.example.testsecurity.service;
  
  import com.example.testsecurity.dto.JoinDTO;
  import com.example.testsecurity.entity.UserEntity;
  import com.example.testsecurity.repository.UserRepository;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
  import org.springframework.stereotype.Service;
  
  @Service
  public class JoinService {
  
      @Autowired
      private UserRepository userRepository;
  
      @Autowired
      private BCryptPasswordEncoder bCryptPasswordEncoder;
  
      public void joinProcess(JoinDTO joinDTO) {
  
          //db에 이미 동일한 username을 가진 회원이 존재하는지?
          boolean isUser = userRepository.existsByUsername(joinDTO.getUsername());
          if (isUser) {
              return;
          }
  
          UserEntity data = new UserEntity();
  
          data.setUsername(joinDTO.getUsername());
          data.setPassword(bCryptPasswordEncoder.encode(joinDTO.getPassword()));
          data.setRole("ROLE_USER");
  
          userRepository.save(data);
      }
  }