Set portmapper for oauth2Login() #oauth2Login #portMapper

PostProcessor.java

ObjectPostProcessor<AuthenticationEntryPoint> authenticationEntryPointFilterPostProcessor = new ObjectPostProcessor<>() {
    @Override
    public <O extends AuthenticationEntryPoint> O postProcess(O authenticationEntryPoint) {
        if (authenticationEntryPoint instanceof DelegatingAuthenticationEntryPoint delegatingAuthenticationEntryPoint) {
            Field entryPointsField = ReflectionUtils.findField(DelegatingAuthenticationEntryPoint.class, "entryPoints");
            assert entryPointsField != null;
            entryPointsField.setAccessible(true);
            LinkedHashMap<RequestMatcher, AuthenticationEntryPoint> entryPoints =
                    (LinkedHashMap<RequestMatcher, AuthenticationEntryPoint>) ReflectionUtils.getField(entryPointsField,
                            delegatingAuthenticationEntryPoint);
            entryPoints.values().forEach(authenticationEntryPointValue -> {
                if (authenticationEntryPointValue instanceof LoginUrlAuthenticationEntryPoint loginUrlAuthenticationEntryPoint) {
                    PortMapperImpl portMapper = new PortMapperImpl();
                    portMapper.setPortMappings(Map.of("80", "80", "8080", "8080"));
                    loginUrlAuthenticationEntryPoint.setPortMapper(portMapper);
                }
            });
        }

        return authenticationEntryPoint;
    }
};


httpSecurity
    .oauth2Login((OAuth2LoginConfigurer<HttpSecurity> httpSecurityOAuth2LoginConfigurer) -> {
        httpSecurityOAuth2LoginConfigurer.withObjectPostProcessor(authenticationEntryPointFilterPostProcessor);
    })