动态验签与用户权限拦截(Spring HandlerInterc

• 在对接第三方的时候，为了保证数据的安全性，双方会约定在请求的参数中加上一些签名之类的信息，比如把接口请求的参数排序之后进行加密再比较双方加密的信息是否一致。

eg: 请求地址 http://localhost:8888/userinfo/get?usercode=123&timestamp=123&sign=123

  HashMap<String,String> map=new HashMap<>();
  map.put("usercode","123");
  map.put("timestamp","123");
  map.put("sign","123");
  String signResult=SignatureService.sign(map);
  if(!signResult.equal(sign)){
     log.error("签名错误");
}

• 1.为了避免在每个对接的方法中都进行上面重复的签名校验
• 2. 为了避免之后参数有改动，而要修改逻辑代码(map.put())，所以需要实现参数的动态验证（即：动态读取请求的参数进行参数的加密校验）

解决方案：采用spring HandlerInterceptor对请求进行拦截

SpringBoot (v2.0.5.RELEASE)

1. 定义需要进行参数加密校验的标记注解

package com.futao.springmvcdemo.annotation;

import java.lang.annotation.*;

/**
 * @author futao
 * Created on 2018/9/18-14:46.
 * 需要验证签名的注解
 */
@Target(value = {
        ElementType.TYPE,
        ElementType.METHOD
})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface Sign {
}

2. 定义拦截被标注了该注解的拦截器

package com.futao.springmvcdemo.annotation.impl;

import com.futao.springmvcdemo.annotation.Sign;
import org.apache.commons.lang3.ObjectUtils;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @author futao
 * Created on 2018/9/18-14:49.
 * springmvc拦截器适配器,或者实现HandlerInterceptor
 */
@Component
public class SignInterceptor extends HandlerInterceptorAdapter {
    /**
     * 请求到达controller之前
     *
     * @param request
     * @param response
     * @param handler
     * @return true继续执行controller，false不执行controller
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        if (handler instanceof HandlerMethod) {
            Sign signAnnotation = ((HandlerMethod) handler).getMethodAnnotation(Sign.class);
            //获取请求数据
            String queryString = request.getQueryString();
            //请求的方法被标记了@Sign注解,并且请求的参数不为空
            if (ObjectUtils.allNotNull(signAnnotation) && ObjectUtils.allNotNull(queryString)) {//需要对参数进行加密校验
                for (String kv : queryString.split("&")) {
                    int charIndex = kv.indexOf("=");
                    System.out.println("key: " + kv.substring(0, charIndex));
                    System.out.println("value: " + kv.substring(charIndex));
                }
            }
        }
        return true;
    }
}

3. 注册该拦截器

package com.futao.springmvcdemo.annotation;

import com.futao.springmvcdemo.annotation.impl.SignInterceptor;
import org.springframework.boot.SpringBootConfiguration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

import javax.annotation.Resource;

/**
 * @author futao
 * Created on 2018/9/18-15:15.
 */
@SpringBootConfiguration
public class WebMvcConfiguration implements WebMvcConfigurer {
    @Resource
    private SignInterceptor signInterceptor;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        //  "/**"和"/*"是有区别的
        registry.addInterceptor(signInterceptor).addPathPatterns("/**");
    }
}

4.在controller中使用该注解

package com.futao.springmvcdemo.controller;

import com.alibaba.fastjson.JSONObject;
import com.futao.springmvcdemo.annotation.Sign;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

/**
 * @author futao
 * Created on 2018/9/18-17:15.
 */
@RestController
@RequestMapping(path = "World", produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
public class WorldController {

    @Sign
    @RequestMapping(value = "post", method = RequestMethod.POST, produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
    public JSONObject post(
            @RequestParam("name") String name,
            @RequestParam("password") String password,
            @RequestParam("timestamp") String timestamp,
            @RequestParam("appkey") String appkey,
            @RequestParam("sign") String sign
    ) {
        JSONObject object = new JSONObject();
        object.put("code", 0);
        object.put("result", "请求成功");
        return object;
    }
}

5.测试
请求地址：http://localhost:8080/Hello/post?name=Niubi1&password=Lihai&timestamp=1387113121&appkey=Yyalk23&sign=231
结果：

image.png

用户权限拦截思路一致，看心情更新