package Utils

import (
	"github.com/gin-gonic/gin"
	"net/http"
	"strings"
	"time"
)

// 处理跨域请求,支持options访问
func Cors() gin.HandlerFunc {
	return func(c *gin.Context) {
		c.Header("Access-Control-Allow-Origin", "*")
		c.Header("Access-Control-Allow-Headers", "Content-Type,AccessToken,X-CSRF-Token, Authorization, Token")
		c.Header("Access-Control-Allow-Methods", "POST, GET")
		c.Header("Access-Control-Expose-Headers", "Content-Length, Access-Control-Allow-Origin, Access-Control-Allow-Headers, Content-Type")
		c.Header("Access-Control-Allow-Credentials", "true")

		//如果是GET接口，禁止它缓存
		if strings.Index(c.Request.RequestURI, ".") < 0 {
			c.Header("Cache-Control", "no-cache, no-store, max-age=0, must-revalidate, value")
			c.Header("Expires", "Thu, 01 Jan 1970 00:00:00 GMT")
			c.Header("Last-Modified", time.Now().UTC().Format(http.TimeFormat))
		}
		// 处理请求
		c.Next()
	}
}