feat: Access Token 검증 구현 (#7)

src/main/java/com/api/TaveShot/global/jwt/JwtAuthenticationFilter.java

@@ -5,10 +5,16 @@
 import jakarta.servlet.http.HttpServletRequest;
 import jakarta.servlet.http.HttpServletResponse;
 import java.io.IOException;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Component;
 import org.springframework.web.filter.OncePerRequestFilter;
 
+@Component
+@RequiredArgsConstructor
 public class JwtAuthenticationFilter extends OncePerRequestFilter {
 
+    private final JwtProvider jwtProvider;
+
     @Override
     protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
             throws ServletException, IOException {
@@ -23,11 +29,11 @@ protected void doFilterInternal(HttpServletRequest request, HttpServletResponse
 
         if (authorizationHeader != null) {
             // ToDo Access Token 검증
-            //  jwtProvider.isValidToken(authorizationHeader);
-
-            filterChain.doFilter(request, response);
+              jwtProvider.isValidToken(authorizationHeader);
         }
 
+        filterChain.doFilter(request, response);
+
     }
 
     private boolean isPublicUri(String requestURI) {

src/main/java/com/api/TaveShot/global/jwt/JwtProvider.java

@@ -3,6 +3,7 @@
 import static com.api.TaveShot.global.constant.OauthConstant.ACCESS_TOKEN_VALID_TIME;
 
 import io.jsonwebtoken.Claims;
+import io.jsonwebtoken.ExpiredJwtException;
 import io.jsonwebtoken.Jwts;
 import io.jsonwebtoken.SignatureAlgorithm;
 import io.jsonwebtoken.security.Keys;
@@ -32,10 +33,12 @@ public String generateAccessToken(String id) {
                 .compact();
     }
 
+    // JWT claims 생성
     private Claims createClaims(String id) {
         return Jwts.claims().setSubject(id);
     }
 
+    // JWT 만료 시간 계산
     private long calculateExpirationDate(Date now) {
         return now.getTime() + ACCESS_TOKEN_VALID_TIME;
     }
@@ -44,4 +47,19 @@ private SecretKey generateKey() {
         return Keys.hmacShaKeyFor(SECRET_KEY.getBytes(StandardCharsets.UTF_8));
     }
 
+    // 토큰의 유효성 검사
+    public void isValidToken(String token) {
+        try {
+            SecretKey key = generateKey();
+            Jwts.parserBuilder()
+                    .setSigningKey(key)
+                    .build()
+                    .parseClaimsJws(token);
+
+        } catch (ExpiredJwtException e) { // 어세스 토큰 만료
+            throw new IllegalArgumentException("Access Token expired");
+        } catch (Exception e) {
+            throw new IllegalArgumentException("User Not Authorized");
+        }
+    }
 }