content: package com.example.identityservice.token;
  
  import jakarta.servlet.FilterChain;
  import jakarta.servlet.ServletException;
  import jakarta.servlet.http.HttpServletRequest;
  import jakarta.servlet.http.HttpServletResponse;
  import lombok.RequiredArgsConstructor;
  import org.springframework.lang.NonNull;
  import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
  import org.springframework.security.core.context.SecurityContextHolder;
  import org.springframework.security.core.userdetails.UserDetails;
  import org.springframework.security.core.userdetails.UserDetailsService;
  import org.springframework.security.web.authentication.WebAuthenticationDetailsSource;
  import org.springframework.stereotype.Component;
  import org.springframework.web.filter.OncePerRequestFilter;
  
  import java.io.IOException;
  
  @Component
  @RequiredArgsConstructor
  public class JwtAuthenticationFilter extends OncePerRequestFilter {
  
      private final JwtService jwtService;
      private final UserDetailsService userDetailsService;
      private final TokenRepository tokenRepository;
  
      @Override
      protected void doFilterInternal(@NonNull HttpServletRequest request,@NonNull HttpServletResponse response,
                                      @NonNull FilterChain filterChain) throws ServletException, IOException {
          final String authHeader = request.getHeader("Authorization");
          final String jwt;
          final String userEmail;
          if (authHeader == null || !authHeader.startsWith("Bearer ")) {
              filterChain.doFilter(request, response);
              return;
          }
  
          jwt = authHeader.substring(7);
          userEmail = jwtService.extractUsername(jwt);
  
          if (userEmail != null && SecurityContextHolder.getContext().getAuthentication() == null) {
              UserDetails userDetails = this.userDetailsService.loadUserByUsername(userEmail);
  
              var tokenIsNotExpiredOrRevoked = tokenRepository.findByToken(jwt)
                      .map(t -> !t.isExpired() && !t.isRevoked())
                      .orElse(false);
  
              if (jwtService.isTokenValid(jwt, userDetails) && tokenIsNotExpiredOrRevoked) {
                  UsernamePasswordAuthenticationToken authToken = new UsernamePasswordAuthenticationToken
                          (userDetails, null, userDetails.getAuthorities());
  
                  authToken.setDetails(new WebAuthenticationDetailsSource().buildDetails(request));
                  SecurityContextHolder.getContext().setAuthentication(authToken);
              }
          }
  
          filterChain.doFilter(request, response);
      }
  }
  