feat: AuthController, AuthService 생성 및 회원가입 API 작성 (#4)

src/main/java/com/project/mapdagu/domain/auth/controller/AuthController.java

@@ -0,0 +1,24 @@
+package com.project.mapdagu.domain.auth.controller;
+
+import com.project.mapdagu.common.dto.ResponseDto;
+import com.project.mapdagu.domain.auth.service.AuthService;
+import com.project.mapdagu.domain.member.dto.request.SignUpRequestDto;
+import com.project.mapdagu.domain.member.dto.response.SignUpResponseDto;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequiredArgsConstructor
+public class AuthController {
+
+    private final AuthService authService;
+
+    @PostMapping("/api/sign-up")
+    public ResponseEntity<SignUpResponseDto> signUp(@RequestBody SignUpRequestDto signUpRequestDto) {
+        SignUpResponseDto signUpResponseDto = authService.signUp(signUpRequestDto);
+        return ResponseDto.created(signUpResponseDto);
+    }
+}

src/main/java/com/project/mapdagu/domain/auth/service/AuthService.java

@@ -0,0 +1,38 @@
+package com.project.mapdagu.domain.auth.service;
+
+import com.project.mapdagu.domain.member.dto.request.SignUpRequestDto;
+import com.project.mapdagu.domain.member.dto.response.SignUpResponseDto;
+import com.project.mapdagu.domain.member.entity.Member;
+import com.project.mapdagu.domain.member.repository.MemberRepository;
+import com.project.mapdagu.error.exception.custom.BusinessException;
+import lombok.RequiredArgsConstructor;
+import org.springframework.security.crypto.password.PasswordEncoder;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import static com.project.mapdagu.error.ErrorCode.ALREADY_EXIST_EMAIL;
+import static com.project.mapdagu.error.ErrorCode.ALREADY_EXIST_USERNAME;
+
+@Service
+@Transactional
+@RequiredArgsConstructor
+public class AuthService {
+
+    private final MemberRepository memberRepository;
+    private final PasswordEncoder passwordEncoder;
+
+    public SignUpResponseDto signUp(SignUpRequestDto signUpRequestDto) {
+
+        if (memberRepository.existsByEmail(signUpRequestDto.email())) {
+            throw new BusinessException(ALREADY_EXIST_EMAIL);
+        }
+        if (memberRepository.existsByUserName(signUpRequestDto.userName())) {
+            throw new BusinessException(ALREADY_EXIST_USERNAME);
+        }
+
+        Member member = signUpRequestDto.toEntity();
+        member.passwordEncode(passwordEncoder);
+        memberRepository.save(member);
+        return SignUpResponseDto.of(member.getId(), member.getUserName());
+    }
+}

src/main/java/com/project/mapdagu/domain/member/dto/response/SignUpResponseDto.java

@@ -0,0 +1,7 @@
+package com.project.mapdagu.domain.member.dto.response;
+
+public record SignUpResponseDto(Long id, String userName) {
+    public static SignUpResponseDto of(Long id, String userName){
+        return new SignUpResponseDto(id, userName);
+    }
+}