42 lines
913 B
Go
42 lines
913 B
Go
package rnd
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import (
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"crypto/rand"
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"math/big"
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"github.com/photoprism/photoprism/pkg/checksum"
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)
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const CharsetBase36 = checksum.CharsetBase36
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const CharsetBase62 = checksum.CharsetBase62
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// Base36 generates a random token containing lowercase letters and numbers.
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func Base36(length int) string {
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return Charset(length, CharsetBase36)
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}
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// Base62 generates a random token containing upper and lower case letters as well as numbers.
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func Base62(length int) string {
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return Charset(length, CharsetBase62)
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}
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// Charset generates a random token with the specified length and charset.
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func Charset(length int, charset string) string {
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if length < 1 {
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return ""
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} else if length > 4096 {
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length = 4096
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}
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m := big.NewInt(int64(len(charset)))
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b := make([]byte, length)
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for i := range b {
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if r, err := rand.Int(rand.Reader, m); err == nil {
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b[i] = charset[r.Int64()]
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}
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}
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return string(b)
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}
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