/*
 *     Copyright 2022 The Dragonfly Authors
 *
 * 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 config

import (
	"crypto/tls"
	"net"

	"github.com/johanbrandhorst/certify"

	logger "d7y.io/dragonfly/v2/internal/dflog"
)

func GetCertificate(certifyClient *certify.Certify) func(hello *tls.ClientHelloInfo) (*tls.Certificate, error) {
	return func(hello *tls.ClientHelloInfo) (*tls.Certificate, error) {
		// FIXME peers need pure ip cert, certify checks the ServerName, so workaround here
		if hello.ServerName == "" {
			host, _, err := net.SplitHostPort(hello.Conn.LocalAddr().String())
			if err == nil {
				hello.ServerName = host
			} else {
				logger.Warnf("failed to get host from %s: %s", hello.Conn.LocalAddr().String(), err)
			}
		}
		return certifyClient.GetCertificate(hello)
	}
}