/*
 * 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 checker

import (
	"net/url"
	"strings"
)

func IsURL(str string) bool {
	s := strings.ToLower(str)

	if len(s) == 0 {
		return false
	}

	u, err := url.Parse(s)
	if err != nil || u.Scheme == "" {
		return false
	}

	if u.Host == "" && u.Fragment == "" && u.Opaque == "" {
		return false
	}
	return u.Scheme == "http" || u.Scheme == "https"
}