// Copyright 2016 HenryLee. 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.

// define common middlewares.

package middleware

import (
	"github.com/henrylee2cn/faygo"
)

// CrossOrigin creates Cross-Domain middleware.
// Note: The router node should add the OPTIONS method.
var CrossOrigin faygo.HandlerFunc = func(ctx *faygo.Context) error {
	ctx.SetHeader(faygo.HeaderAccessControlAllowOrigin, ctx.HeaderParam(faygo.HeaderOrigin))
	ctx.SetHeader(faygo.HeaderAccessControlAllowCredentials, "true")
	// General solution
	{
		ctx.SetHeader(faygo.HeaderAccessControlAllowMethods, ctx.HeaderParam(faygo.HeaderAccessControlRequestMethod))
		ctx.SetHeader(faygo.HeaderAccessControlAllowHeaders, ctx.HeaderParam(faygo.HeaderAccessControlRequestHeaders))
		ctx.SetHeader(faygo.HeaderAccessControlMaxAge, "-1")
	}
	// Efficient solution
	{
		// ctx.SetHeader(faygo.HeaderAccessControlAllowMethods, "POST, GET, OPTIONS, PUT, DELETE")
		// ctx.SetHeader(faygo.HeaderAccessControlAllowHeaders, "Accept, Content-Type, Content-Length, Accept-Encoding, X-CSRF-Token, Authorization")
		// ctx.SetHeader(faygo.HeaderAccessControlMaxAge, "172800")
	}
	if ctx.IsOptions() {
		ctx.W.WriteHeader(204)
		ctx.Stop()
	}
	return nil
}
