From 9983e86144cfc2ad0ac70abf03e9a7cc41bb68fe Mon Sep 17 00:00:00 2001
From: sonsumin <sonsumin00@gmail.com>
Date: Tue, 19 Nov 2024 22:58:38 +0900
Subject: [PATCH] =?UTF-8?q?[#2]=E2=9C=A8Feat:=20JWT=20=ED=86=A0=ED=81=B0?=
 =?UTF-8?q?=20=EC=83=9D=EC=84=B1=20Utils?=
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---
 .../yesummit/global/auth/util/JwtUtils.java   | 105 ++++++++++++++++++
 1 file changed, 105 insertions(+)
 create mode 100644 src/main/java/univ/yesummit/global/auth/util/JwtUtils.java

diff --git a/src/main/java/univ/yesummit/global/auth/util/JwtUtils.java b/src/main/java/univ/yesummit/global/auth/util/JwtUtils.java
new file mode 100644
index 0000000..4d2b803
--- /dev/null
+++ b/src/main/java/univ/yesummit/global/auth/util/JwtUtils.java
@@ -0,0 +1,105 @@
+package univ.yesummit.global.auth.util;
+
+import com.auth0.jwt.JWT;
+import com.auth0.jwt.algorithms.Algorithm;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Service;
+import univ.yesummit.domain.member.repository.MemberRepository;
+
+import java.util.Date;
+import java.util.Optional;
+
+@Getter
+@Service
+@RequiredArgsConstructor
+@Slf4j
+public class JwtUtils {
+
+    @Value("${jwt.secret}")
+    private String secret;
+
+    @Value("${jwt.access.expiration}")
+    private Long accessExpiration;
+
+    @Value("${jwt.refresh.expiration}")
+    private Long refreshExpiration;
+
+    @Value("${jwt.access.header}")
+    private String accessHeader;
+
+    @Value("${jwt.refresh.header}")
+    private String refreshHeader;
+
+    private static final String ACCESS_TOKEN_SUBJECT = "AccessToken";
+    private static final String REFRESH_TOKEN_SUBJECT = "RefreshToken";
+    private static final String ID_CLAIM = "member_id";
+    private static final String BEARER = "Bearer ";
+
+    private final MemberRepository memberRepository;
+
+    public String createAccessToken(Long memberId) {
+
+        log.info("memberId info: {}", memberId.toString());
+
+        String accessToken = JWT.create()
+                .withSubject(ACCESS_TOKEN_SUBJECT)
+                .withExpiresAt(new Date(System.currentTimeMillis() + accessExpiration))
+                .withClaim(ID_CLAIM, memberId)
+                .sign(Algorithm.HMAC512(secret));
+
+
+        log.info("Generated Access Token: {}", accessToken);
+
+        return accessToken;
+    }
+
+
+    public String createRefreshToken() {
+        return JWT.create()
+                .withSubject(REFRESH_TOKEN_SUBJECT)
+                .withExpiresAt(new Date(System.currentTimeMillis() + refreshExpiration))
+                .sign(Algorithm.HMAC512(secret));
+    }
+
+    public void sendAccessAndRefreshToken(HttpServletResponse response, String accessToken, String refreshToken) {
+        response.setStatus(HttpServletResponse.SC_OK);
+
+        response.setHeader(accessHeader, accessToken);
+        response.setHeader(refreshHeader, refreshToken);
+        log.info("Access Token: {}, Refresh Token: {}", accessToken, refreshToken);
+    }
+
+    public Optional<String> extractAccessToken(HttpServletRequest request) {
+        String header = request.getHeader(accessHeader);
+        log.info("Access header: {}", header);
+        return Optional.ofNullable(request.getHeader(accessHeader))
+                .filter(accessToken -> accessToken.startsWith(BEARER))
+                .map(accessToken -> accessToken.replace(BEARER, ""));
+    }
+
+    public Optional<Long> extractMemberId(String token) {
+        Long memberId = JWT.require(Algorithm.HMAC512(secret))
+                .build()
+                .verify(token)
+                .getClaim("member_id")
+                .asLong();
+
+        return Optional.ofNullable(memberId);
+    }
+    /* 토큰 유효성 검증 */
+    public boolean isValid(String token) {
+        try {
+            JWT.require(Algorithm.HMAC512(secret)).build().verify(token);
+            return true;
+        } catch (Exception e) {
+            log.error("유효하지 않은 Token입니다", e.getMessage());
+            return false;
+        }
+    }
+    //==========================================================================//
+}
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