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SpringBoot SpringSecurity(三)添加登陆

SpringBoot SpringSecurity(三)添加登陆

作者: lconcise | 来源:发表于2019-07-30 18:58 被阅读0次
    1. 生成图形验证码
    2. 改造登陆页
    3. 认证流程添加验证码校验

    添加验证码大致可以分为三个步骤:根据随机数生成验证码图片;将验证码图片显示到登录页面;认证流程中加入验证码校验。Spring Security的认证校验是由UsernamePasswordAuthenticationFilter过滤器完成的,所以我们的验证码校验逻辑应该在这个过滤器之前。

    生成图形验证码

    添加依赖

            <dependency>
                <groupId>org.springframework.social</groupId>
                <artifactId>spring-social-config</artifactId>
                <version>1.1.6.RELEASE</version>
            </dependency>
    

    创建一个验证码对象ImageCode:

    @Data
    public class ImageCode {
    
        private BufferedImage image;
        private String code;
        private LocalDateTime expireTime;
    
        public ImageCode(BufferedImage image, String code, int expireIn) {
            this.image = image;
            this.code = code;
            this.expireTime = LocalDateTime.now().plusSeconds(expireIn);
        }
    
        boolean isExpire() {
            return LocalDateTime.now().isAfter(expireTime);
        }
    }
    

    ImageCode对象包含了三个属性:image图片,code验证码和expireTime过期时间。isExpire方法用于判断验证码是否已过期。

    创建ValidateController,编写接口,返回图形验证码:

    @RestController
    public class ValidateController {
    
        public final static String SESSION_KEY_IMAGE_CODE = "SESSION_KEY_IMAGE_CODE";
    
        private SessionStrategy sessionStrategy = new HttpSessionSessionStrategy();
    
        @GetMapping("/code/image")
        public void createCode(HttpServletRequest request, HttpServletResponse response) throws IOException {
            ImageCode imageCode = createImageCode();
            sessionStrategy.setAttribute(new ServletWebRequest(request), SESSION_KEY_IMAGE_CODE, imageCode);
            ImageIO.write(imageCode.getImage(), "jpeg", response.getOutputStream());
        }
    
        private ImageCode createImageCode() {
            int width = 100; // 验证码图片宽度
            int height = 36; // 验证码图片长度
            int length = 4;  // 验证码位数
            int expireIn = 60; // 验证码有效时间 60s
    
            BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
    
            Graphics graphics = image.getGraphics();
    
            Random random = new Random();
    
            graphics.setColor(getRandColor(200, 500));
            graphics.fillRect(0, 0, width, height);
            graphics.setFont(new Font("Times New Roman", Font.ITALIC, 20));
            graphics.setColor(getRandColor(160, 200));
            for (int i = 0; i < 155; i++) {
                int x = random.nextInt(width);
                int y = random.nextInt(height);
                int xl = random.nextInt(12);
                int yl = random.nextInt(12);
                graphics.drawLine(x, y, x + xl, y + yl);
            }
            StringBuilder sRand = new StringBuilder();
            for (int i = 0; i < length; i++) {
                String rand = String.valueOf(random.nextInt(10));
                sRand.append(rand);
                graphics.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110)));
                graphics.drawString(rand, 13 * i + 6, 16);
            }
    
            graphics.dispose();
    
            return new ImageCode(image, sRand.toString(), expireIn);
        }
    
        private Color getRandColor(int fc, int bc) {
            Random random = new Random();
            if (fc > 255)
                fc = 255;
    
            if (bc > 255)
                bc = 255;
            int r = fc + random.nextInt(bc - fc);
            int g = fc + random.nextInt(bc - fc);
            int b = fc + random.nextInt(bc - fc);
            return new Color(r, g, b);
        }
    }
    

    createImageCode方法用于生成验证码对象,org.springframework.social.connect.web.HttpSessionSessionStrategy对象封装了一些处理Session的方法,包含了setAttribute、getAttribute和removeAttribute方法,具体可以查看该类的源码。使用sessionStrategy将生成的验证码对象存储到Session中,并通过IO流将生成的图片输出到登录页面上。

    改造登录页面

    在登录页面添加如下代码:

            <span style="display: inline">
                <input type="text" name="imageCode" placeholder="验证码" style="width: 50%;"/>
                <img src="/code/image"/>
            </span>
    

    <img>标签的src属性对应ValidateController的createImageCode方法。

    配置验证码请求不配拦截: "/code/image"

        @Override
        protected void configure(HttpSecurity http) throws Exception {
            http.addFilterBefore(validateCodeFilter, UsernamePasswordAuthenticationFilter.class) //添加验证码效验过滤器
                    .formLogin() // 表单登录
                    .loginPage("/login.html")       // 登录跳转url
    //                .loginPage("/authentication/require")
                    .loginProcessingUrl("/login")   // 处理表单登录url
    //                .successHandler(authenticationSuccessHandler)
                    .failureHandler(authenticationFailureHandler)
                    .and()
                    .authorizeRequests()            // 授权配置
                    .antMatchers("/login.html", "/css/**", "/authentication/require", "/code/image").permitAll()  // 无需认证
                    .anyRequest()                   // 所有请求
                    .authenticated()                // 都需要认证
                    .and().csrf().disable();
    
        }
    

    重启项目,访问登录:


    image.png

    认证流程添加验证码效验

    在校验验证码的过程中,可能会抛出各种验证码类型的异常,比如“验证码错误”、“验证码已过期”等,所以我们定义一个验证码类型的异常类:

    public class ValidateCodeException extends AuthenticationException {
    
        private static final long serialVersionUID = 2672899097153524723L;
    
        public ValidateCodeException(String explanation) {
            super(explanation);
        }
    }
    

    注意,这里继承的是AuthenticationException而不是Exception。

    我们都知道,Spring Security实际上是由许多过滤器组成的过滤器链,处理用户登录逻辑的过滤器为UsernamePasswordAuthenticationFilter,而验证码校验过程应该是在这个过滤器之前的,即只有验证码校验通过后才去校验用户名和密码。由于Spring Security并没有直接提供验证码校验相关的过滤器接口,所以我们需要自己定义一个验证码校验的过滤器ValidateCodeFilter:

    @Component
    public class ValidateCodeFilter extends OncePerRequestFilter {
    
        @Autowired
        private AuthenticationFailureHandler authenticationFailureHandler;
    
        private SessionStrategy sessionStrategy = new HttpSessionSessionStrategy();
    
        @Override
        protected void doFilterInternal(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, FilterChain filterChain) throws ServletException, IOException {
            if (StringUtils.equalsIgnoreCase("/login", httpServletRequest.getRequestURI())
                    && StringUtils.equalsIgnoreCase(httpServletRequest.getMethod(), "post")) {
                try {
                    validateCode(new ServletWebRequest(httpServletRequest));
                } catch (ValidateCodeException e) {
                    authenticationFailureHandler.onAuthenticationFailure(httpServletRequest, httpServletResponse, e);
                    return;
                }
            }
            filterChain.doFilter(httpServletRequest, httpServletResponse);
        }
    
        private void validateCode(ServletWebRequest servletWebRequest) throws ServletRequestBindingException, ValidateCodeException {
          ......
        }
    }
    

    ValidateCodeFilter继承了org.springframework.web.filter.OncePerRequestFilter,该过滤器只会执行一次。

    在doFilterInternal方法中我们判断了请求URL是否为/login,该路径对应登录form表单的action路径,请求的方法是否为POST,是的话进行验证码校验逻辑,否则直接执行filterChain.doFilter让代码往下走。当在验证码校验的过程中捕获到异常时,调用Spring Security的校验失败处理器AuthenticationFailureHandler进行处理。

    validateCode的校验逻辑如下所示:

        private void validateCode(ServletWebRequest servletWebRequest) throws ServletRequestBindingException, ValidateCodeException {
            ImageCode codeInSession = (ImageCode) sessionStrategy.getAttribute(servletWebRequest, ValidateController.SESSION_KEY_IMAGE_CODE);
            String codeInRequest = ServletRequestUtils.getStringParameter(servletWebRequest.getRequest(), "imageCode");
    
            if (StringUtils.isBlank(codeInRequest)) {
                throw new ValidateCodeException("验证码不能为空!");
            }
            if (codeInSession == null) {
                throw new ValidateCodeException("验证码不存在!");
            }
            if (codeInSession.isExpire()) {
                sessionStrategy.removeAttribute(servletWebRequest, ValidateController.SESSION_KEY_IMAGE_CODE);
                throw new ValidateCodeException("验证码已过期!");
            }
            if (!StringUtils.equalsIgnoreCase(codeInSession.getCode(), codeInRequest)) {
                throw new ValidateCodeException("验证码不正确!");
            }
            sessionStrategy.removeAttribute(servletWebRequest, ValidateController.SESSION_KEY_IMAGE_CODE);
        }
    

    我们分别从Session中获取了ImageCode对象和请求参数imageCode(对应登录页面的验证码<input>框name属性),然后进行了各种判断并抛出相应的异常。当验证码过期或者验证码校验通过时,我们便可以删除Session中的ImageCode属性了。

    验证码校验过滤器定义好了,怎么才能将其添加到UsernamePasswordAuthenticationFilter前面呢?很简单,只需要在BrowserSecurityConfig的configure方法中添加些许配置即可:

        @Override
        protected void configure(HttpSecurity http) throws Exception {
            http.addFilterBefore(validateCodeFilter, UsernamePasswordAuthenticationFilter.class) //添加验证码效验过滤器
                    .formLogin() // 表单登录
                    .loginPage("/login.html")       // 登录跳转url
    //                .loginPage("/authentication/require")
                    .loginProcessingUrl("/login")   // 处理表单登录url
    //                .successHandler(authenticationSuccessHandler)
                    .failureHandler(authenticationFailureHandler)
                    .and()
                    .authorizeRequests()            // 授权配置
                    .antMatchers("/login.html", "/css/**", "/authentication/require", "/code/image").permitAll()  // 无需认证
                    .anyRequest()                   // 所有请求
                    .authenticated()                // 都需要认证
                    .and().csrf().disable();
    
        }
    

    上面代码中,我们注入了ValidateCodeFilter,然后通过addFilterBefore方法将ValidateCodeFilter验证码校验过滤器添加到了UsernamePasswordAuthenticationFilter前面。

    重启项目,当不输入验证码的时候,返回:


    image.png

    输入错误验证码的时候:


    image.png

    源码地址:https://github.com/lbshold/springboot/tree/master/Spring-Security-ValidateCode

    参考文章:
    https://www.cnblogs.com/wutianqi/p/9186645.html
    https://mrbird.cc/Spring-Security-ValidateCode.html

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