feat: 로그인 된 회원 전용 API에 사용할 새로운 Interceptor 및 어노테이션 추가

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

@@ -19,3 +19,7 @@ annotation class MemberId
 annotation class AdminOnly(
     val privilege: Privilege
 )
+
+@Target(AnnotationTarget.FUNCTION)
+@Retention(AnnotationRetention.RUNTIME)
+annotation class UserOnly

src/main/kotlin/roomescape/auth/web/support/interceptors/UserInterceptor.kt

@@ -0,0 +1,50 @@
+package roomescape.auth.web.support.interceptors
+
+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
+import roomescape.auth.business.CLAIM_TYPE_KEY
+import roomescape.auth.exception.AuthErrorCode
+import roomescape.auth.exception.AuthException
+import roomescape.auth.infrastructure.jwt.JwtUtils
+import roomescape.auth.web.support.MDC_MEMBER_ID_KEY
+import roomescape.auth.web.support.UserOnly
+import roomescape.auth.web.support.accessToken
+import roomescape.common.dto.PrincipalType
+
+private val log: KLogger = KotlinLogging.logger {}
+
+@Component
+class UserInterceptor(
+    private val jwtUtils: JwtUtils
+) : HandlerInterceptor {
+
+    override fun preHandle(
+        request: HttpServletRequest,
+        response: HttpServletResponse,
+        handler: Any
+    ): Boolean {
+        if ((handler !is HandlerMethod) || (handler.getMethodAnnotation(UserOnly::class.java) == null)) {
+            return true
+        }
+
+        val token: String? = request.accessToken()
+        val userId = jwtUtils.extractSubject(token).also { id -> MDC.put(MDC_MEMBER_ID_KEY, id) }
+
+        jwtUtils.extractClaim(token, CLAIM_TYPE_KEY).also {
+            if (it != PrincipalType.USER.name) {
+                log.warn { "[UserInterceptor] 관리자의 회원 API 접근: id=${userId}" }
+                throw AuthException(AuthErrorCode.ACCESS_DENIED)
+            }
+        }
+
+        log.info { "[AuthInterceptor] 인증 완료. userId=$userId" }
+
+        return true
+    }
+}