Modify 비밀키 환경변수로 숨김 처리

src/main/java/com/example/springsecuritystudy/jwt/SigningKeyResolver.java

@@ -5,18 +5,20 @@ import java.security.Key;
 import io.jsonwebtoken.Claims;
 import io.jsonwebtoken.JwsHeader;
 import io.jsonwebtoken.SigningKeyResolverAdapter;
+import lombok.RequiredArgsConstructor;
 
 /**
  * JwsHeader를 통해 Signature 검증에 필요한 Key를 가져오는 코드를 구현합니다.
  */
+@RequiredArgsConstructor
 public class SigningKeyResolver extends SigningKeyResolverAdapter {
-	public static SigningKeyResolver instance = new SigningKeyResolver();
+	private final JwtKey jwtKey;
 
 	@Override
 	public Key resolveSigningKey(JwsHeader jwsHeader, Claims claims) {
 		String kid = jwsHeader.getKeyId();
 		if (kid == null)
 			return null;
-		return JwtKey.getKey(kid);
+		return jwtKey.getKey(kid);
 	}
 }