package api

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

// Cors Gin跨域处理中间件
func Cors() gin.HandlerFunc {
	return func(c *gin.Context) {
		method := c.Request.Method
		c.Header("Access-Control-Allow-Origin", "*") // 可将将 * 替换为指定的域名
		c.Header("Access-Control-Allow-Methods", "POST, GET, OPTIONS, PUT, DELETE, UPDATE")
		c.Header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept, Authorization, access-control-allow-origin")
		c.Header("Access-Control-Expose-Headers", "Content-Length, Access-Control-Allow-Origin, Access-Control-Allow-Headers, Cache-Control, Content-Language, Content-Type")
		c.Header("Access-Control-Allow-Credentials", "true")
		c.Header("Cache-Control", "no-cache") // 静态文件不走缓存使用
		if method == "OPTIONS" {              // 放行所有Options请求
			c.AbortWithStatus(http.StatusNoContent)
		}
		c.Next()
	}
}