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// Copyright (c) 2022 Tulir Asokan
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
package util
import (
"crypto/rand"
"encoding/base64"
"hash/crc32"
"strings"
"unsafe"
)
func RandomBytes(n int) []byte {
data := make([]byte, n)
_, err := rand.Read(data)
if err != nil {
panic(err)
}
return data
}
var letters = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
// RandomString generates a random string of the given length.
func RandomString(n int) string {
if n <= 0 {
return ""
}
base64Len := n
if n%4 != 0 {
base64Len += 4 - (n % 4)
}
decodedLength := base64.RawStdEncoding.DecodedLen(base64Len)
output := make([]byte, base64Len)
base64.RawStdEncoding.Encode(output, RandomBytes(decodedLength))
for i, char := range output {
if char == '+' || char == '/' {
_, err := rand.Read(output[i : i+1])
if err != nil {
panic(err)
}
output[i] = letters[int(output[i])%len(letters)]
}
}
return (*(*string)(unsafe.Pointer(&output)))[:n]
}
func base62Encode(val uint32, minWidth int) string {
var buf strings.Builder
for val > 0 {
buf.WriteByte(letters[val%62])
val /= 62
}
return strings.Repeat("0", minWidth-buf.Len()) + buf.String()
}
func RandomToken(namespace string, randomLength int) string {
token := namespace + "_" + RandomString(randomLength)
checksum := base62Encode(crc32.ChecksumIEEE([]byte(token)), 6)
return token + "_" + checksum
}
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