以前胖哥带大家用Spring Security过滤器实现了验证码认证,今天我们来改良一下验证码认证的配置方式,更符合Spring Security的设计风格,也更加内卷。

CaptchaAuthenticationFilter是通过模仿UsernamePasswordAuthenticationFilter实现的。同样的道理,由于UsernamePasswordAuthenticationFilter的配置是由FormLoginConfigurer来完成的,应该也能模仿一下FormLoginConfigurer,写一个配置类CaptchaAuthenticationFilterConfigurer去配置CaptchaAuthenticationFilter

public final class FormLoginConfigurer<H extends HttpSecurityBuilder<H>> extends
		AbstractAuthenticationFilterConfigurer<H, FormLoginConfigurer<H>, UsernamePasswordAuthenticationFilter> {

    // 省略
}

AbstractAuthenticationFilterConfigurer

FormLoginConfigurer看起来有点复杂,不过继承关系并不复杂,只继承了AbstractAuthenticationFilterConfigurer

public abstract class AbstractAuthenticationFilterConfigurer<B extends HttpSecurityBuilder<B>, T extends AbstractAuthenticationFilterConfigurer<B, T, F>, F extends AbstractAuthenticationProcessingFilter>
		extends AbstractHttpConfigurer<T, B> {
}

理论上我们模仿一下,也继承一下这个类,但是你会发现这种方式行不通。因为AbstractAuthenticationFilterConfigurer只能Spring Security内部使用,不建议自定义。原因在于它最终向HttpSecurity添加过滤器使用的是HttpSecurity.addFilter(Filter)方法,这个方法只有内置过滤器(参见FilterOrderRegistration)才能使用。了解了这个机制之后,我们只能往上再抽象一层,去改造其父类AbstractHttpConfigurer

改造过程

AbstractAuthenticationFilterConfigurer<B,T,F>中的B是实际指的HttpSecurity,因此这个要保留;

T指的是它本身的实现,我们配置CaptchaAuthenticationFilter不需要下沉一层到FormLoginConfigurer这个继承级别,直接在AbstractAuthenticationFilterConfigurer这个继承级别实现即可,因此T这里指的就是需要配置类本身,也不需要再抽象化,因此是不需要的;同样的原因F也不需要,很明确是CaptchaAuthenticationFilter,不需要再泛化。这样CaptchaAuthenticationFilter的配置类结构可以这样定义:

public class CaptchaAuthenticationFilterConfigurer<H extends HttpSecurityBuilder<H>> extends AbstractHttpConfigurer<CaptchaAuthenticationFilterConfigurer<H>, H> {
    // 不再泛化  具体化
    private final CaptchaAuthenticationFilter authFilter;
    // 特定的验证码用户服务
    private CaptchaUserDetailsService captchaUserDetailsService;
    // 验证码处理服务
    private CaptchaService captchaService;
    // 保存认证请求细节的策略
    private AuthenticationDetailsSource<HttpServletRequest, ?> authenticationDetailsSource;
    // 默认使用保存请求认证成功处理器
    private SavedRequestAwareAuthenticationSuccessHandler defaultSuccessHandler = new SavedRequestAwareAuthenticationSuccessHandler();
    // 认证成功处理器
    private AuthenticationSuccessHandler successHandler = this.defaultSuccessHandler;
     // 登录认证端点
    private LoginUrlAuthenticationEntryPoint authenticationEntryPoint;
    // 是否 自定义页面
    private boolean customLoginPage;
    // 登录页面
    private String loginPage;
    // 登录成功url
    private String loginProcessingUrl;
    // 认证失败处理器
    private AuthenticationFailureHandler failureHandler;
    // 认证路径是否放开
    private boolean permitAll;
    //  认证失败的url
    private String failureUrl;

    /**
     * Creates a new instance with minimal defaults
     */
    public CaptchaAuthenticationFilterConfigurer() {
        setLoginPage("/login/captcha");
        this.authFilter = new CaptchaAuthenticationFilter();
    }

    public CaptchaAuthenticationFilterConfigurer<H> formLoginDisabled() {
        this.formLoginEnabled = false;
        return this;
    }

    public CaptchaAuthenticationFilterConfigurer<H> captchaUserDetailsService(CaptchaUserDetailsService captchaUserDetailsService) {
        this.captchaUserDetailsService = captchaUserDetailsService;
        return this;
    }

    public CaptchaAuthenticationFilterConfigurer<H> captchaService(CaptchaService captchaService) {
        this.captchaService = captchaService;
        return this;
    }

    public CaptchaAuthenticationFilterConfigurer<H> usernameParameter(String usernameParameter) {
        authFilter.setUsernameParameter(usernameParameter);
        return this;
    }

    public CaptchaAuthenticationFilterConfigurer<H> captchaParameter(String captchaParameter) {
        authFilter.setCaptchaParameter(captchaParameter);
        return this;
    }

    public CaptchaAuthenticationFilterConfigurer<H> parametersConverter(Converter<HttpServletRequest, CaptchaAuthenticationToken> converter) {
        authFilter.setConverter(converter);
        return this;
    }
    @Override
    public void init(H http) throws Exception {
        updateAuthenticationDefaults();
        updateAccessDefaults(http);
        registerDefaultAuthenticationEntryPoint(http);
        // 这里禁用默认页面过滤器 如果你想自定义登录页面 可以自行实现 可能和FormLogin冲突
        // initDefaultLoginFilter(http);
        // 把对应的Provider也在init时写入HttpSecurity
        initProvider(http);
    }
     @Override
    public void configure(H http) throws Exception {

        //这里改为使用前插过滤器方法
         http.addFilterBefore(filter, LogoutFilter.class);
    }

     // 其它方法 同AbstractAuthenticationFilterConfigurer
}

其实就是模仿AbstractAuthenticationFilterConfigurer及其实现类的风格把用的配置项实现一边。这里值得一提的是CaptchaService的配置也可以从Spring IoC中查找(参考getBeanOrNull方法,这个方法在Spring Security中随处可见,建议借鉴),这样更加灵活,既能从方法配置也能自动注入。

    private void initProvider(H http) {

        ApplicationContext applicationContext = http.getSharedObject(ApplicationContext.class);
        // 没有配置CaptchaUserDetailsService就去Spring IoC获取
        if (captchaUserDetailsService == null) {
            captchaUserDetailsService = getBeanOrNull(applicationContext, CaptchaUserDetailsService.class);
        }
        // 没有配置CaptchaService就去Spring IoC获取
        if (captchaService == null) {
            captchaService = getBeanOrNull(applicationContext, CaptchaService.class);
        }
        // 初始化 Provider
        CaptchaAuthenticationProvider captchaAuthenticationProvider = this.postProcess(new CaptchaAuthenticationProvider(captchaUserDetailsService, captchaService));
        // 会增加到ProviderManager的注册列表中
        http.authenticationProvider(captchaAuthenticationProvider);
    }

配置类效果

我们来看看CaptchaAuthenticationFilterConfigurer的配置效果:

    @Bean
    SecurityFilterChain defaultSecurityFilterChain(HttpSecurity http, UserDetailsService userDetailsService) throws Exception {


        http.csrf().disable()
                .authorizeRequests()
                .mvcMatchers("/foo/**").access("hasAuthority('ROLE_USER')")
                .anyRequest().authenticated()
                .and()
                // 所有的 AbstractHttpConfigurer 都可以通过apply方法加入HttpSecurity
                .apply(new CaptchaAuthenticationFilterConfigurer<>())
                // 配置验证码处理服务   这里直接true 方便测试
                .captchaService((phone, rawCode) -> true)
                // 通过手机号去拿验证码,这里为了方便直接写死了,实际phone和username做个映射
                .captchaUserDetailsService(phone -> userDetailsService.loadUserByUsername("felord"))
                // 默认认证成功跳转到/路径  这里改造成把认证信息直接返回json
                .successHandler((request, response, authentication) -> {
                // 这里把认证信息以JSON形式返回
                    ServletServerHttpResponse servletServerHttpResponse = new ServletServerHttpResponse(response);
                    MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter = new MappingJackson2HttpMessageConverter();
                           mappingJackson2HttpMessageConverter.write(authentication, MediaType.APPLICATION_JSON,servletServerHttpResponse);
                });

        return http.build();
    }

是不是要优雅很多,解决了你自己配置过滤器的很多疑难杂症。学习一定要模仿,先模仿成功,然后再分析思考为什么会模仿成功,最后形成自己的创造力。千万不要被一些陌生概念唬住,有些改造是不需要去深入了解细节的。

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02-22 14:21