// Copyright (C) 2014-2018 Goodrain Co., Ltd.
// RAINBOND, Application Management Platform

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version. For any non-GPL usage of Rainbond,
// one or multiple Commercial Licenses authorized by Goodrain Co., Ltd.
// must be obtained first.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.

package middleware

import (
	"context"
	"net/http"
)

//APIVersion api版本
func APIVersion(next http.Handler) http.Handler {
	fn := func(w http.ResponseWriter, r *http.Request) {
		apiVersion := r.Header.Get("API_VERSION")
		if apiVersion == "" {
			apiVersion = "default"
		}
		ctx := context.WithValue(r.Context(), ContextKey("api_version"), apiVersion)
		next.ServeHTTP(w, r.WithContext(ctx))
	}
	return http.HandlerFunc(fn)
}