feat: Interceptor / Resolver 에 실패 로깅 및 성공시 member_id MDC 등록 추가

src/main/kotlin/roomescape/auth/web/support/AuthInterceptor.kt

@@ -1,7 +1,10 @@
 package roomescape.auth.web.support
 
+import io.github.oshai.kotlinlogging.KLogger
+import io.github.oshai.kotlinlogging.KotlinLogging
 import jakarta.servlet.http.HttpServletRequest
 import jakarta.servlet.http.HttpServletResponse
+import org.slf4j.MDC
 import org.springframework.stereotype.Component
 import org.springframework.web.method.HandlerMethod
 import org.springframework.web.servlet.HandlerInterceptor
@@ -11,6 +14,8 @@ import roomescape.auth.infrastructure.jwt.JwtHandler
 import roomescape.member.business.MemberService
 import roomescape.member.infrastructure.persistence.MemberEntity
 
+private val log: KLogger = KotlinLogging.logger {}
+
 @Component
 class AuthInterceptor(
     private val memberService: MemberService,
@@ -28,23 +33,29 @@ class AuthInterceptor(
             return true
         }
 
-        val member: MemberEntity = findMember(request)
+        val accessToken: String? = request.accessToken()
+        log.info { "[AuthInterceptor] 인증 시작. accessToken=${accessToken}" }
+        val member: MemberEntity = findMember(accessToken)
 
         if (admin != null && !member.isAdmin()) {
+            log.info { "[AuthInterceptor] 관리자 인증 실패. memberId=${member.id}, role=${member.role}" }
             throw AuthException(AuthErrorCode.ACCESS_DENIED)
         }
 
+        MDC.put("member_id", "${member.id}")
+        log.info { "[AuthInterceptor] 인증 완료. memberId=${member.id}, role=${member.role}" }
         return true
     }
 
-    private fun findMember(request: HttpServletRequest): MemberEntity {
+    private fun findMember(accessToken: String?): MemberEntity {
         try {
-            val token: String? = request.accessToken()
+            val memberId = jwtHandler.getMemberIdFromToken(accessToken)
-            val memberId: Long = jwtHandler.getMemberIdFromToken(token)
-
             return memberService.findById(memberId)
+                .also { MDC.put("member_id", "$memberId") }
         } catch (e: Exception) {
-            throw e
+            log.info { "[AuthInterceptor] 회원 조회 실패. accessToken = ${accessToken}" }
+            val errorCode = AuthErrorCode.MEMBER_NOT_FOUND
+            throw AuthException(errorCode, e.message ?: errorCode.message)
         }
     }
 }

src/main/kotlin/roomescape/auth/web/support/MemberIdResolver.kt

@@ -1,14 +1,21 @@
 package roomescape.auth.web.support
 
+import io.github.oshai.kotlinlogging.KLogger
+import io.github.oshai.kotlinlogging.KotlinLogging
 import jakarta.servlet.http.HttpServletRequest
+import org.slf4j.MDC
 import org.springframework.core.MethodParameter
 import org.springframework.stereotype.Component
 import org.springframework.web.bind.support.WebDataBinderFactory
 import org.springframework.web.context.request.NativeWebRequest
 import org.springframework.web.method.support.HandlerMethodArgumentResolver
 import org.springframework.web.method.support.ModelAndViewContainer
+import roomescape.auth.exception.AuthErrorCode
+import roomescape.auth.exception.AuthException
 import roomescape.auth.infrastructure.jwt.JwtHandler
 
+private val log: KLogger = KotlinLogging.logger {}
+
 @Component
 class MemberIdResolver(
     private val jwtHandler: JwtHandler
@@ -27,6 +34,13 @@ class MemberIdResolver(
         val request: HttpServletRequest = webRequest.nativeRequest as HttpServletRequest
         val token: String? = request.accessToken()
 
+        try {
             return jwtHandler.getMemberIdFromToken(token)
+                .also { MDC.put("member_id", "$it") }
+        } catch (e: Exception) {
+            log.info { "[MemberIdResolver] 회원 조회 실패. message=${e.message}" }
+            val errorCode = AuthErrorCode.MEMBER_NOT_FOUND
+            throw AuthException(errorCode, e.message ?: errorCode.message)
+        }
     }
 }