Springboot实现filter拦截token验证和跨域
背景
web验证授权合法的一般分为下面几种
- 使用session作为验证合法用户访问的验证方式
- 使用自己实现的token
- 使用OCA标准
在使用API接口授权验证时，token是自定义的方式实现起来不需要引入其他东西，关键是简单实用。
合法登陆后一般使用用户UID+盐值+时间戳使用多层对称加密生成token并放入分布式缓存中设置固定的过期时间长（和session的方式有些相同），这样当用户访问时使用token可以解密获取它的UID并据此验证其是否是合法的用户。
springboot中实现filter
- 一种是注解filter
- 一种是显示的硬编码注册filter
先有filter
import javax.servlet.annotation.WebFilter; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.stereotype.Component; import springfox.documentation.spring.web.json.Json; import com.alibaba.fastjson.JSON; import java.io.IOException; import java.io.OutputStreamWriter; import java.io.PrintWriter; import java.io.UnsupportedEncodingException; import javax.servlet.Filter; import javax.servlet.FilterChain; import javax.servlet.FilterConfig; import javax.servlet.ServletException; import javax.servlet.ServletRequest; import javax.servlet.ServletResponse; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /*************** * token验证拦截 * @author bamboo zjcjava@163.com * @time 2017-08-01 */ @Component //@WebFilter(urlPatterns = { "/api/v/*" }, filterName = "tokenAuthorFilter") public class TokenAuthorFilter implements Filter { private static Logger logger = LoggerFactory .getLogger(TokenAuthorFilter.class); @Override public void destroy() { } @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { HttpServletRequest req = (HttpServletRequest) request; HttpServletResponse rep = (HttpServletResponse) response; //设置允许跨域的配置 // 这里填写你允许进行跨域的主机ip（正式上线时可以动态配置具体允许的域名和IP） rep.setHeader("Access-Control-Allow-Origin", "*"); // 允许的访问方法 rep.setHeader("Access-Control-Allow-Methods","POST, GET, PUT, OPTIONS, DELETE, PATCH"); // Access-Control-Max-Age 用于 CORS 相关配置的缓存 rep.setHeader("Access-Control-Max-Age", "3600"); rep.setHeader("Access-Control-Allow-Headers","token,Origin, X-Requested-With, Content-Type, Accept"); response.setCharacterEncoding("UTF-8"); response.setContentType("application/json; charset=utf-8"); String token = req.getHeader("token");//header方式 ResultInfo resultInfo = new ResultInfo(); boolean isFilter = false; String method = ((HttpServletRequest) request).getMethod(); if (method.equals("OPTIONS")) { rep.setStatus(HttpServletResponse.SC_OK); }else{ if (null == token || token.isEmpty()) { resultInfo.setCode(Constant.UN_AUTHORIZED); resultInfo.setMsg("用户授权认证没有通过!客户端请求参数中无token信息"); } else { if (TokenUtil.volidateToken(token)) { resultInfo.setCode(Constant.SUCCESS); resultInfo.setMsg("用户授权认证通过!"); isFilter = true; } else { resultInfo.setCode(Constant.UN_AUTHORIZED); resultInfo.setMsg("用户授权认证没有通过!客户端请求参数token信息无效"); } } if (resultInfo.getCode() == Constant.UN_AUTHORIZED) {// 验证失败 PrintWriter writer = null; OutputStreamWriter osw = null; try { osw = new OutputStreamWriter(response.getOutputStream(), "UTF-8"); writer = new PrintWriter(osw, true); String jsonStr = JSON.toJSONString(resultInfo); writer.write(jsonStr); writer.flush(); writer.close(); osw.close(); } catch (UnsupportedEncodingException e) { logger.error("过滤器返回信息失败:" + e.getMessage(), e); } catch (IOException e) { logger.error("过滤器返回信息失败:" + e.getMessage(), e); } finally { if (null != writer) { writer.close(); } if (null != osw) { osw.close(); } } return; } if (isFilter) { logger.info("token filter过滤ok!"); chain.doFilter(request, response); } } } @Override public void init(FilterConfig arg0) throws ServletException { } }
注解配置filter
加上如下配置则启动时会根据注解加载此filter
@WebFilter(urlPatterns = { “/api/*” }, filterName = “tokenAuthorFilter”)
硬编码注册filter
在application.java中加入如下代码
//注册filter @Bean public FilterRegistrationBean filterRegistrationBean() { FilterRegistrationBean registrationBean = new FilterRegistrationBean(); TokenAuthorFilter tokenAuthorFilter = new TokenAuthorFilter(); registrationBean.setFilter(tokenAuthorFilter); List<String> urlPatterns = new ArrayList<String>(); urlPatterns.add("/api/*"); registrationBean.setUrlPatterns(urlPatterns); return registrationBean; }
以上两种方式都可以实现filter
跨域说明
springboot可以设置全局跨域，但是对于filter中的拦截地址并不其中作用，因此需要在dofilter中再次设置一次
区局设置跨域方式如下
方式1.在application.java中加入如下代码
//跨域设置 private CorsConfiguration buildConfig() { CorsConfiguration corsConfiguration = new CorsConfiguration(); corsConfiguration.addAllowedOrigin("*"); corsConfiguration.addAllowedHeader("*"); corsConfiguration.addAllowedMethod("*"); return corsConfiguration; } /** * 跨域过滤器 * @return */ @Bean public CorsFilter corsFilter() { UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource(); source.registerCorsConfiguration("/**", buildConfig()); // 4 return new CorsFilter(source); }
方式2.配置注解
必须集成WebMvcConfigurerAdapter类
/********** * 跨域 CORS:使用 方法3 * 方法: 1服务端设置Respone Header头中Access-Control-Allow-Origin 2配合前台使用jsonp 3继承WebMvcConfigurerAdapter 添加配置类 http://blog.csdn.net/hanghangde/article/details/53946366 * @author xialeme * */ @Configuration public class CorsConfig extends WebMvcConfigurerAdapter{ /* @Override public void addCorsMappings(CorsRegistry registry) { registry.addMapping("/**") .allowedOrigins("*") .allowCredentials(true) .allowedMethods("GET", "POST", "DELETE", "PUT") .maxAge(3600); } */ private CorsConfiguration buildConfig() { CorsConfiguration corsConfiguration = new CorsConfiguration(); corsConfiguration.addAllowedOrigin("*"); // 1 corsConfiguration.addAllowedHeader("*"); // 2 corsConfiguration.addAllowedMethod("*"); // 3 return corsConfiguration; } @Bean public CorsFilter corsFilter() { UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource(); source.registerCorsConfiguration("/**", buildConfig()); // 4 return new CorsFilter(source); } }
