Spring Security using HTTP headers

Question

I am trying to add security to my Spring Boot application. My current application is using REST controllers and every time I get a GET or POST request

Answer 1

the minimal code addition is to define a filter and add it to the security configuration, smth like

XHeaderAuthenticationFilter.java

@Component
public class XHeaderAuthenticationFilter extends OncePerRequestFilter {

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

    String xAuth = request.getHeader("X-Authorization");

    User user = findByToken(xAuth);

    if (user == null) {
        response.sendError(HttpServletResponse.SC_UNAUTHORIZED, "Token invalid");
    } else {
        final UsernamePasswordAuthenticationToken authentication =
                new UsernamePasswordAuthenticationToken(user, null, user.getAuthorities());
        SecurityContextHolder.getContext().setAuthentication(authentication);

        filterChain.doFilter(request, response);
    }
}

//need to implement db user validation...
private User findByToken(String token) {
    if (!token.equals("1234"))
        return null;

    final User user = new User(
            "username",
            "password",
            true,
            true,
            true,
            true,
            Collections.singletonList(new SimpleGrantedAuthority("ROLE_USER")));

    return user;
}
}

SecurityConfig.java

@Configuration
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {

    @Override
    protected void configure(final HttpSecurity http) throws Exception {
        http.sessionManagement()
                .sessionCreationPolicy(SessionCreationPolicy.STATELESS)
            .and()
            .csrf().disable()
            .authorizeRequests().anyRequest().authenticated()
            .and()
            .exceptionHandling()
                .authenticationEntryPoint(new HttpStatusEntryPoint(HttpStatus.UNAUTHORIZED))
            .and()
            .addFilterBefore(new XHeaderAuthenticationFilter(), UsernamePasswordAuthenticationFilter.class);
    }
}

another approach is to use spring's AOP to define annotation of some logic to perform before entering the annotated controller method