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// JWT Authentication Middleware
@Component
public class JwtAuthenticationFilter extends OncePerRequestFilter {
    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
        String token = extractTokenFromRequest(request);
        if (token != null && JwtUtil.validateToken(token)) {
            // Authentication logic here
        }
        filterChain.doFilter(request, response);
    }
}