Feat :: user details service 추가

src/main/kotlin/com/byebye/chapterTwo/domain/member/application/service/UserDetailsServiceImpl.kt

@@ -0,0 +1,29 @@
+package com.byebye.chapterTwo.domain.member.application.service
+
+import com.byebye.chapterTwo.domain.member.adapter.out.mapper.MemberMapper
+import com.byebye.chapterTwo.domain.member.adapter.out.repository.MemberRepository
+import com.byebye.chapterTwo.domain.member.application.exception.MemberErrorCode
+import com.byebye.chapterTwo.global.auth.exception.CustomException
+import com.byebye.chapterTwo.global.auth.jwt.JwtUserDetails
+import org.springframework.data.repository.findByIdOrNull
+import org.springframework.security.core.userdetails.UserDetails
+import org.springframework.security.core.userdetails.UserDetailsService
+import org.springframework.stereotype.Service
+
+@Service
+class UserDetailsServiceImpl(
+    private val memberRepository : MemberRepository,
+    private val memberMapper: MemberMapper
+): UserDetailsService {
+    override fun loadUserByUsername(username: String?): UserDetails {
+        username?: throw CustomException(MemberErrorCode.MEMBER_NOT_FOUND)
+
+        val memberEntity = memberRepository
+            .findByName(username)
+            ?: throw CustomException(MemberErrorCode.MEMBER_NOT_FOUND)
+
+        val member = memberMapper.toDomain(memberEntity)
+
+        return JwtUserDetails(member)
+    }
+}