package middleware

import (
	"net/http"

	"github.com/gin-gonic/gin"
)

// CorsMiddleware 处理跨域请求中间件
func CorsMiddleware() gin.HandlerFunc {
	return func(c *gin.Context) {
		method := c.Request.Method
		origin := c.Request.Header.Get("Origin")

		if origin != "" {
			// 允许所有来源，生产环境建议配置为具体的域名
			c.Header("Access-Control-Allow-Origin", "*")
			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")
			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")
		}

		// 放行所有OPTIONS方法
		if method == "OPTIONS" {
			c.AbortWithStatus(http.StatusNoContent)
		}

		c.Next()
	}
}
