From 9ee3af9498e5482de332ec7dae2e9c21c132c798 Mon Sep 17 00:00:00 2001
From: Jaehyun Ahn <91878695+uwoobeat@users.noreply.github.com>
Date: Sun, 11 Feb 2024 18:43:33 +0900
Subject: [PATCH] =?UTF-8?q?feat:=20=ED=98=84=EC=9E=AC=20=EB=A1=9C=EA=B7=B8?=
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* feat: 멤버 유틸리티 구현

* refactor: 예외 케이스 분리 및 불필요한 메서드 제거
---
 .../gdsc/global/exception/ErrorCode.java      |  7 +++-
 .../gdsc/global/util/MemberUtil.java          | 41 +++++++++++++++++++
 2 files changed, 46 insertions(+), 2 deletions(-)
 create mode 100644 src/main/java/com/gdschongik/gdsc/global/util/MemberUtil.java

diff --git a/src/main/java/com/gdschongik/gdsc/global/exception/ErrorCode.java b/src/main/java/com/gdschongik/gdsc/global/exception/ErrorCode.java
index 4bf8434d3..582bdf4af 100644
--- a/src/main/java/com/gdschongik/gdsc/global/exception/ErrorCode.java
+++ b/src/main/java/com/gdschongik/gdsc/global/exception/ErrorCode.java
@@ -9,16 +9,19 @@
 public enum ErrorCode {
     INTERNAL_SERVER_ERROR(HttpStatus.INTERNAL_SERVER_ERROR, "서버 에러입니다."),
 
-    // Jwt
+    // Auth
     INVALID_JWT_TOKEN(HttpStatus.UNAUTHORIZED, "유효하지 않은 JWT 토큰입니다."),
     EXPIRED_JWT_TOKEN(HttpStatus.UNAUTHORIZED, "만료된 JWT 토큰입니다."),
+    AUTH_NOT_EXIST(HttpStatus.INTERNAL_SERVER_ERROR, "시큐리티 인증 정보가 존재하지 않습니다."),
+    AUTH_NOT_PARSABLE(HttpStatus.INTERNAL_SERVER_ERROR, "시큐리티 인증 정보 파싱에 실패했습니다."),
 
     // Parameter
     INVALID_QUERY_PARAMETER(HttpStatus.BAD_REQUEST, "잘못된 쿼리 파라미터입니다."),
 
     // Member
     MEMBER_NOT_FOUND(HttpStatus.NOT_FOUND, "존재하지 않는 회원입니다."),
-    MEMBER_DELETED(HttpStatus.CONFLICT, "탈퇴한 회원입니다.");
+    MEMBER_DELETED(HttpStatus.CONFLICT, "탈퇴한 회원입니다."),
+    ;
 
     private final HttpStatus status;
     private final String message;
diff --git a/src/main/java/com/gdschongik/gdsc/global/util/MemberUtil.java b/src/main/java/com/gdschongik/gdsc/global/util/MemberUtil.java
new file mode 100644
index 000000000..63315d461
--- /dev/null
+++ b/src/main/java/com/gdschongik/gdsc/global/util/MemberUtil.java
@@ -0,0 +1,41 @@
+package com.gdschongik.gdsc.global.util;
+
+import com.gdschongik.gdsc.domain.member.dao.MemberRepository;
+import com.gdschongik.gdsc.domain.member.domain.Member;
+import com.gdschongik.gdsc.global.exception.CustomException;
+import com.gdschongik.gdsc.global.exception.ErrorCode;
+import lombok.RequiredArgsConstructor;
+import org.springframework.security.core.Authentication;
+import org.springframework.security.core.context.SecurityContextHolder;
+import org.springframework.stereotype.Component;
+
+@Component
+@RequiredArgsConstructor
+public class MemberUtil {
+
+    private final MemberRepository memberRepository;
+
+    public Long getCurrentMemberId() {
+        Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
+
+        validateAuthenticationNotNull(authentication);
+
+        try {
+            return Long.parseLong(authentication.getName());
+        } catch (NumberFormatException e) {
+            throw new CustomException(ErrorCode.AUTH_NOT_PARSABLE);
+        }
+    }
+
+    private void validateAuthenticationNotNull(Authentication authentication) {
+        if (authentication == null) {
+            throw new CustomException(ErrorCode.AUTH_NOT_EXIST);
+        }
+    }
+
+    public Member getCurrentMember() {
+        return memberRepository
+                .findById(getCurrentMemberId())
+                .orElseThrow(() -> new CustomException(ErrorCode.MEMBER_NOT_FOUND));
+    }
+}