@EnableWebSecurity
@EnableJpaRepositories(basePackageClasses = AccountRepo.class)
@Configuration
@EnableGlobalMethodSecurity(securedEnabled=true, prePostEnabled=true)
public class SecurityConfiguration extends WebSecurityConfigurerAdapter{

    @Autowired
    private UserDetailsService userDetailsService;

    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.userDetailsService(userDetailsService).passwordEncoder(passwordEncoder());
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception {

        http
            .cors()
            .and()
            .csrf().disable()

            // add filters
            .addFilter(new JWTAuthenticationFilter(authenticationManager()))
            .addFilter(new JWTAuthorizationFilter(authenticationManager()))

            // don't create session
            .sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS).and()

            .authorizeRequests()
                .antMatchers(authenticationUrl).permitAll()
                .anyRequest().authenticated()
                .and()

            .csrf().disable();
    }

    @Bean(name="passwordEncoder")
    public PasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder();
    }

    @Bean
    CorsConfigurationSource corsConfigurationSource() {
        final UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**", new CorsConfiguration().applyPermitDefaultValues());
        return source;
    }

}

public class JWTAuthenticationFilter extends UsernamePasswordAuthenticationFilter {

    private AuthenticationManager authenticationManager;

    public JWTAuthenticationFilter(AuthenticationManager authenticationManager) {
        this.authenticationManager = authenticationManager;
    }

    @Override
    public Authentication attemptAuthentication(HttpServletRequest req,
                                                HttpServletResponse res) throws AuthenticationException {
        try {
            AuthenticationRequest creds = new ObjectMapper()
                    .readValue(req.getInputStream(), AuthenticationRequest.class);

            return authenticationManager.authenticate(
                    new UsernamePasswordAuthenticationToken(
                            creds.getEmail(),
                            creds.getPassword(),
                            new ArrayList<>())
            );
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    protected void successfulAuthentication(HttpServletRequest req,
                                            HttpServletResponse res,
                                            FilterChain chain,
                                            Authentication auth) throws IOException, ServletException {
        String token = Jwts.builder()
                .setSubject(((User) auth.getPrincipal()).getUsername())
                .setExpiration(Date.from(OffsetDateTime.now().plusMinutes(EXPIRATION_TIME).toInstant()))
                .signWith(SignatureAlgorithm.HS512, SECRET.getBytes())
                .compact();
        res.addHeader(HEADER_STRING, TOKEN_PREFIX + token);
    }
}

@Service
public class UserDetailsServiceImpl implements UserDetailsService {

    @Autowired
    private AccountService service;

    @Override
    public UserDetails loadUserByUsername(String email) throws UsernameNotFoundException {
        VAccount account = service.getAccountByEmail(email);
        if(account == null) {
            throw new UsernameNotFoundException("no user found with email '" + email + "'");
        }

        Set<GrantedAuthority> grantedAuthorities = new HashSet<>();
        for (VRole role : account.getRoles()){
            System.out.println(role.getName().toString());
            grantedAuthorities.add(new SimpleGrantedAuthority(role.getName().toString()));
        }

        return new org.springframework.security.core.userdetails.User(account.getEmail(), account.getPassHash(), grantedAuthorities);
    }

}