package middleware

import (
	"bytes"
	"github.com/gin-gonic/gin"
	"io/ioutil"
	"log"
	"net/http"
)

func CrossSite(c *gin.Context) {
	c.Writer.Header().Set("Access-Control-Allow-Origin", "*")
	//服务器支持的所有跨域请求的方法
	c.Header("Access-Control-Allow-Methods", "POST, GET, OPTIONS, PUT, DELETE,UPDATE")
	//允许跨域设置可以返回其他子段，可以自定义字段
	c.Header("Access-Control-Allow-Headers", "x-requested-with,Content-Type,Authorization,Content-Length,X-CSRF-Token,Token,session")
	// 允许浏览器（客户端）可以解析的头部 （重要）
	c.Header("Access-Control-Expose-Headers", "Content-Length,Access-Control-Allow-Origin,Access-Control-Allow-Headers")
	c.Header("X-Content-Type-Options", "nosniff")
	//允许客户端传递校验信息比如 cookie (重要)
	c.Header("Access-Control-Allow-Credentials", "true")
	if c.Request.Method == "OPTIONS" {
		c.JSON(http.StatusOK, "Options Request!")
		c.Abort()
	}
	data, err := c.GetRawData()
	if err != nil {
		log.Println(err.Error())
	}
	c.Request.Body = ioutil.NopCloser(bytes.NewBuffer(data)) // 关键点
	c.Next()
}