JwtRequestFilter.java

package se.mow_e.components;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.filter.OncePerRequestFilter;
import se.mow_e.services.JwtService;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Component
public class JwtRequestFilter extends OncePerRequestFilter {

    private final Logger log = LoggerFactory.getLogger(JwtRequestFilter.class);

    public static final String AUTHORIZATION_HEADER = "Authorization";

    @Autowired
    private JwtService jwtService;

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain chain)
            throws ServletException, IOException {

        String jwt = resolveToken(request);
        String requestURI = request.getRequestURI();

        if (StringUtils.hasText(jwt) && jwtService.validateToken(jwt)) {
            Authentication authentication = jwtService.getAuthentication(jwt);
            SecurityContextHolder.getContext().setAuthentication(authentication);
            log.debug("set Authentication to security context for '{}', uri: {}", authentication.getName(), requestURI);
        } else {
            log.debug("no valid JWT token found, uri: {}", requestURI);
        }
        chain.doFilter(request, response);
    }

    private String resolveToken(HttpServletRequest request) {
        String bearerToken = request.getHeader(AUTHORIZATION_HEADER);
        if (StringUtils.hasText(bearerToken) && bearerToken.startsWith("Bearer ")) {
            return bearerToken.substring(7);
        }
        return null;
    }

}