/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 util

import (
	"net"
	"strconv"
	"strings"
)

func IsHostPort(s string) bool {
	parts := strings.Split(s, ":")
	if len(parts) != 2 {
		return false
	}

	return (IsIP(parts[0]) || IsDomain(parts[0])) && IsPort(parts[1])
}

func IsIP(ip string) bool {
	return net.ParseIP(ip) != nil
}

func IsPort(port string) bool {
	p, err := strconv.Atoi(port)
	if err != nil {
		return false
	}
	return p > 0 && p < 65536
}

func IsDomain(domain string) bool {
	_, err := net.LookupHost(domain)
	return err == nil
}
