Hands-On Spring Security 5 for Reactive Applications

Custom AuthenticationProvider

If needs be, we can write a custom AuthenticationProvider by implementing the AuthenticationProvider interface. We will have to implement two methods, namely authenticate (Authentication) and supports(Class<?> aClass):

@Componentpublic class CustomAuthenticationProvider implements AuthenticationProvider {    @Override    public Authentication authenticate(Authentication authentication) throws                 AuthenticationException {      String username = authentication.getName();      String password = authentication.getCredentials().toString();      if ("user".equals(username) && "password".equals(password)) {        return new UsernamePasswordAuthenticationToken          (username, password, Collections.emptyList());      } else { throw new BadCredentialsException("Authentication ...