// Package middleware 定义平台 API 自有的 HTTP 中间件。
package middleware

import (
	"net/http"

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

const (
	allowedHeaders = "Origin, Content-Length, Content-Type, Workspace, Request-Id, Authorization, Token"
	allowedMethods = "GET, POST, PUT, PATCH, DELETE, HEAD, OPTIONS"
)

// Cors 允许平台前端跨域调用 API，包括状态更新使用的 PATCH 方法。
func Cors() gin.HandlerFunc {
	return func(ctx *gin.Context) {
		ctx.Header("Access-Control-Allow-Origin", "*")
		ctx.Header("Access-Control-Allow-Headers", allowedHeaders)
		ctx.Header("Access-Control-Allow-Methods", allowedMethods)
		if ctx.Request.Method == http.MethodOptions {
			ctx.AbortWithStatus(http.StatusNoContent)
			return
		}
		ctx.Next()
	}
}