refactor: 토큰 타입을 위한 변수 category -> token 으로 변경

Author: sapiens2000

src/main/java/com/example/log4u/common/oauth2/jwt/JwtAuthenticationFilter.java

@@ -75,7 +75,7 @@ protected void doFilterInternal(
 		// 토큰 만료 확인 , 만료 시 다음 필터로 넘기지 않음(재발급 필요)
 		try {
 			System.out.println("만료확인");
-			System.out.println("category : " + jwtUtil.getCategory(accessToken));
+			System.out.println("token type : " + jwtUtil.getTokenType(accessToken));
 			System.out.println("userId : " + jwtUtil.getUserId(accessToken));
 			System.out.println("role : " + jwtUtil.getRole(accessToken));
 			jwtUtil.isExpired(accessToken);
@@ -88,17 +88,16 @@ protected void doFilterInternal(
 		}
 
 		// 토큰이 access인지 확인 (발급 시 페이로드에 명시)
-		String category = jwtUtil.getCategory(accessToken);
+		String tokenType = jwtUtil.getTokenType(accessToken);
 
 		// 이상한 값일 경우
-		if (!category.equals("access")) {
+		if (!tokenType.equals("access")) {
 			PrintWriter writer = response.getWriter();
 			writer.print("토큰이 만료되었습니다.");
 			response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
 			return;
 		}
 
-
 		// userId, role
 		Long userId = jwtUtil.getUserId(accessToken);
 

src/main/java/com/example/log4u/common/oauth2/jwt/JwtUtil.java

@@ -16,7 +16,9 @@
 public class JwtUtil {
 
 	private final SecretKey secretKey;
-
+	private static final String USER_ID_KEY = "userId";
+	private static final String TOKEN_TYPE_KEY = "token";
+	
 	public JwtUtil(@Value("${jwt.secret}") String secret) {
 		secretKey = new SecretKeySpec(secret.getBytes(StandardCharsets.UTF_8),
 			Jwts.SIG.HS256.key().build().getAlgorithm());
@@ -29,9 +31,9 @@ public Long getUserId(String token) {
 				.build()
 				.parseSignedClaims(token)
 				.getPayload()
-				.get("userId", Long.class);
+				.get(USER_ID_KEY, Long.class);
 		} catch(ExpiredJwtException ex){
-			return ex.getClaims().get("userId", Long.class);
+			return ex.getClaims().get(USER_ID_KEY, Long.class);
 		}
 	}
 
@@ -48,16 +50,16 @@ public String getRole(String token) {
 		}
 	}
 
-	public String getCategory(String token) {
+	public String getTokenType(String token) {
 		try {
 			return Jwts.parser()
 				.verifyWith(secretKey)
 				.build()
 				.parseSignedClaims(token)
 				.getPayload()
-				.get("category", String.class);
+				.get(TOKEN_TYPE_KEY, String.class);
 		}catch(ExpiredJwtException ex){
-			return ex.getClaims().get("category", String.class);
+			return ex.getClaims().get(TOKEN_TYPE_KEY, String.class);
 		}
 	}
 
@@ -71,10 +73,10 @@ public Boolean isExpired(String token) {
 			.before(new Date());
 	}
 
-	public String createJwt(String category, Long userId, String role, Long expiredMs) {
+	public String createJwt(String tokenType, Long userId, String role, Long expiredMs) {
 		return Jwts.builder()
-			.claim("category", category)
-			.claim("userId", userId)
+			.claim(TOKEN_TYPE_KEY, tokenType)
+			.claim(USER_ID_KEY, userId)
 			.claim("role", role)
 			.issuedAt(new Date(System.currentTimeMillis()))
 			.expiration(new Date(System.currentTimeMillis() + expiredMs*1000))