package middleware

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

// Cors 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.Request.Header.Get("Origin"))
		c.Header("Access-Control-Allow-Headers", "Content-Type, AccessToken, X-CSRF-Token, Authorization, Token, X-Token, X-User-Id, Origin, X-Requested-With")
		c.Header("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE, PUT")
		//c.Header("Access-Control-Expose-Headers", "Content-Length, Access-Control-Allow-Origin, Access-Control-Allow-Headers, Content-Type")
		c.Header("Access-Control-Expose-Headers", c.GetHeader("Access-Control-Request-Headers"))
		c.Header("Access-Control-Allow-Credentials", "true")
		c.Writer.Header().Set("Access-Control-Max-Age", "3600")
		// 放行所有OPTIONS方法
		if c.Request.Method == "OPTIONS" {
			c.AbortWithStatus(http.StatusNoContent)
		}
		// 处理请求
		c.Next()
	}
}