JWTAuthorizationFilter.java

package com.discoverops.roleplay;

import io.jsonwebtoken.Jwts;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;

@Component
@Order(1)
public class JWTAuthorizationFilter implements Filter {

    private static final String SECRET = "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAtHyDhb7JXslejrcOJM53gjQDOQtF5ihaEpTcT+kONZOwFFLSoH8HZJD//5C3znGx/kIXPJUWGIeuRjQ8XS2ryX0hYwINx0X86b7m+dloO9/Zo1qbfNTc5UE2Qcs58oBcPVN2UEExzouggSVwGMIiQuSrBtzpHY0erzsd3kMUUWZRjChigzWo7TaI+PYxKhQGoGSIb63BLrZ+xXrDHPoNu6LTJb7BQmu0zGRphLO/JGq6sajFjBrEnf5wEK3dSWaMBGzNIKkN3uZS1Xuf74DBPktSUHmLuk40Gja02dpxaRLpiJg8lzfm/yBaqCc4Wk9rMs1XZHBu4kJeuO+2/ACjCQIDAQAB";
    private static final String TOKEN_PREFIX = "Bearer";
    private static final String HEADER_STRING = "Authorization";


    @Override
    public void destroy() {

    }

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
            throws IOException, ServletException {

        if (!(servletRequest instanceof HttpServletRequest)) {
            return;
        }

        HttpServletRequest request = (HttpServletRequest) servletRequest;

        String token = request.getHeader(HEADER_STRING);
        if (token != null) {
            String user = Jwts.parser()
                    .setSigningKey(SECRET)

                    .parseClaimsJws(token.replace(TOKEN_PREFIX, ""))
                    .getBody()
                    .getSubject();

            filterChain.doFilter(servletRequest, servletResponse);
        }
    }
}

RoleplayApplication.java

package com.discoverops.roleplay;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletComponentScan;
import org.springframework.context.annotation.Bean;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@SpringBootApplication
@ServletComponentScan
@RestController
@EnableAutoConfiguration
public class RoleplayApplication {

    @RequestMapping("/")
    String hello() {
        return "hello world";
    }

    public static void main(String[] args) {
        SpringApplication.run(RoleplayApplication.class, args);
    }

    @Bean
    public FilterRegistrationBean<JWTAuthorizationFilter> dawsonApiFilter() {
        FilterRegistrationBean<JWTAuthorizationFilter> registration = new FilterRegistrationBean<JWTAuthorizationFilter>();
        registration.setFilter(new JWTAuthorizationFilter());
        return registration;
    }
}