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// Copyright 2018 ThousandEyes Inc.
//
// 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 utils
import (
"fmt"
"net"
"path/filepath"
"strings"
)
// Filter receives a slide of strings and a function that receives a string
// and returns a bool, and returns a slide that has only the strings that
// returned true when they were applied the received function.
func Filter(files []string, fn func(string) bool) []string {
var ret []string
for _, f := range files {
if fn(f) {
ret = append(ret, f)
}
}
return ret
}
// StringInSlice receives a string and a slice of strings and returns true if it exists
// there.
func StringInSlice(a string, list []string) bool {
for _, b := range list {
if b == a {
return true
}
}
return false
}
// KeyInMap checks wheter the received key exists in the received map.
func KeyInMap(key string, mapInput map[string]interface{}) bool {
_, found := mapInput[key]
return found
}
// MapToString provides a string representation of a map of strings.
func MapToString(mapInput map[string]interface{}) string {
result := ""
for k, v := range mapInput {
if len(result) > 0 {
result += ", "
}
result += fmt.Sprintf("%s:%v", k, v)
}
return result
}
// BaseURLforEnvName provides an environment-sensitive method for returning
// the BaseURL of the application.
func BaseURLforEnvName(baseURL, environment string) string {
if environment != "" {
return filepath.Join(baseURL, "env", environment)
}
return baseURL
}
// ResolveHostname receives an IP and returns the resolved PTR. It returns an
// empty string in case the DNS lookup fails.
func ResolveHostname(ip string) (host string) {
hosts, err := net.LookupAddr(ip)
if err != nil {
return ""
}
return hosts[0]
}
// IsValidIP returns whether or not an IP is well-formed.
func IsValidIP(ip string) bool {
return net.ParseIP(ip) != nil
}
// IsValidMAC returns whether or not a MAC address is well-formed.
func IsValidMAC(mac string) bool {
_, err := net.ParseMAC(mac)
return err == nil
}
// MacColonToDash receives a mac address and replace its colons by dashes
func MacColonToDash(mac string) string {
return strings.Replace(mac, ":", "-", -1)
}
// MacDashToColon receives a mac address and replace its dashes by colons
func MacDashToColon(mac string) string {
return strings.Replace(mac, "-", ":", -1)
}
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