// Copyright © 2023 OpenIM open source community. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package middleware

import (
	"net/http"

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

// EnableCROS enable cros.
func EnableCROS() gin.HandlerFunc {
	return func(c *gin.Context) {
		// c.Writer.Header().Set("Access-Control-Allow-Origin", "*")
		c.Writer.Header().Set("Access-Control-Allow-Origin", c.GetHeader("origin"))
		c.Writer.Header().Set("Access-Control-Max-Age", "70000")
		c.Writer.Header().Set("Access-Control-Allow-Methods", "POST, GET, OPTIONS, PUT, DELETE, UPDATE, PATCH")
		c.Writer.Header().Set("Access-Control-Allow-Headers", "Content-Type, Content-Length,token")
		c.Writer.Header().Set("Access-Control-Expose-Headers", "Content-Length, Access-Control-Allow-Headers,token")
		c.Writer.Header().Set("Access-Control-Allow-Credentials", "true")

		if c.Request.Method == "OPTIONS" {
			c.AbortWithStatus(http.StatusNoContent)
		}
		c.Next()
	}
}