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/
utils.go
88 lines (78 loc) · 1.59 KB
/
utils.go
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package utils
import (
"crypto/rand"
"encoding/binary"
"encoding/json"
"errors"
"fmt"
"net"
"os"
"regexp"
"strconv"
uuid "github.com/satori/go.uuid"
)
var b64 = regexp.MustCompile(`^([A-Za-z0-9+/]{4})*([A-Za-z0-9+/]{4}|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{2}==)$`)
func IsValidBase64(s string) bool {
return b64.Match([]byte(s))
}
func IsValidIPAddress(addr string) bool {
return net.ParseIP(addr) != nil
}
func IsValidJSON(s string) bool {
var js interface{}
return json.Unmarshal([]byte(s), &js) == nil
}
func GenerateUUID() string {
return fmt.Sprintf("%s", uuid.NewV4())
}
func Exists(path string) (bool, error) {
_, err := os.Stat(path)
if err == nil {
return true, nil
}
if os.IsNotExist(err) {
return false, nil
}
return true, err
}
func GetIPAddress() (string, error) {
ifaces, err := net.Interfaces()
if err != nil {
return "", err
}
for _, iface := range ifaces {
if iface.Flags&net.FlagUp == 0 {
continue // interface down
}
if iface.Flags&net.FlagLoopback != 0 {
continue // loopback interface
}
addrs, err := iface.Addrs()
if err != nil {
return "", err
}
for _, addr := range addrs {
var ip net.IP
switch v := addr.(type) {
case *net.IPNet:
ip = v.IP
case *net.IPAddr:
ip = v.IP
}
if ip == nil || ip.IsLoopback() {
continue
}
ip = ip.To4()
if ip == nil {
continue // not an ipv4 address
}
return ip.String(), nil
}
}
return "", errors.New("Failed to get ip address")
}
func RandomString() string {
var n uint64
binary.Read(rand.Reader, binary.LittleEndian, &n)
return strconv.FormatUint(n, 36)
}