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