76 lines
1.9 KiB
Go
76 lines
1.9 KiB
Go
package util
|
|
|
|
import (
|
|
"crypto/rand"
|
|
"encoding/base64"
|
|
"fmt"
|
|
"strings"
|
|
|
|
"tailscale.com/tailcfg"
|
|
)
|
|
|
|
// GenerateRandomBytes returns securely generated random bytes.
|
|
// It will return an error if the system's secure random
|
|
// number generator fails to function correctly, in which
|
|
// case the caller should not continue.
|
|
func GenerateRandomBytes(n int) ([]byte, error) {
|
|
bytes := make([]byte, n)
|
|
|
|
// Note that err == nil only if we read len(b) bytes.
|
|
if _, err := rand.Read(bytes); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return bytes, nil
|
|
}
|
|
|
|
// GenerateRandomStringURLSafe returns a URL-safe, base64 encoded
|
|
// securely generated random string.
|
|
// It will return an error if the system's secure random
|
|
// number generator fails to function correctly, in which
|
|
// case the caller should not continue.
|
|
func GenerateRandomStringURLSafe(n int) (string, error) {
|
|
b, err := GenerateRandomBytes(n)
|
|
|
|
return base64.RawURLEncoding.EncodeToString(b), err
|
|
}
|
|
|
|
// GenerateRandomStringDNSSafe returns a DNS-safe
|
|
// securely generated random string.
|
|
// It will return an error if the system's secure random
|
|
// number generator fails to function correctly, in which
|
|
// case the caller should not continue.
|
|
func GenerateRandomStringDNSSafe(size int) (string, error) {
|
|
var str string
|
|
var err error
|
|
for len(str) < size {
|
|
str, err = GenerateRandomStringURLSafe(size)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
str = strings.ToLower(
|
|
strings.ReplaceAll(strings.ReplaceAll(str, "_", ""), "-", ""),
|
|
)
|
|
}
|
|
|
|
return str[:size], nil
|
|
}
|
|
|
|
func TailNodesToString(nodes []*tailcfg.Node) string {
|
|
temp := make([]string, len(nodes))
|
|
|
|
for index, node := range nodes {
|
|
temp[index] = node.Name
|
|
}
|
|
|
|
return fmt.Sprintf("[ %s ](%d)", strings.Join(temp, ", "), len(temp))
|
|
}
|
|
|
|
func TailMapResponseToString(resp tailcfg.MapResponse) string {
|
|
return fmt.Sprintf(
|
|
"{ Node: %s, Peers: %s }",
|
|
resp.Node.Name,
|
|
TailNodesToString(resp.Peers),
|
|
)
|
|
}
|