Last change
on this file since fa375fe was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
initial commit
|
-
Property mode
set to
100644
|
File size:
981 bytes
|
Rev | Line | |
---|
[6a3a178] | 1 | let random = bytes =>
|
---|
| 2 | Promise.resolve(crypto.getRandomValues(new Uint8Array(bytes)))
|
---|
| 3 | let customAlphabet = (alphabet, size) => {
|
---|
| 4 | let mask = (2 << (Math.log(alphabet.length - 1) / Math.LN2)) - 1
|
---|
| 5 | let step = -~((1.6 * mask * size) / alphabet.length)
|
---|
| 6 | return () => {
|
---|
| 7 | let id = ''
|
---|
| 8 | while (true) {
|
---|
| 9 | let bytes = crypto.getRandomValues(new Uint8Array(step))
|
---|
| 10 | let i = step
|
---|
| 11 | while (i--) {
|
---|
| 12 | id += alphabet[bytes[i] & mask] || ''
|
---|
| 13 | if (id.length === size) return Promise.resolve(id)
|
---|
| 14 | }
|
---|
| 15 | }
|
---|
| 16 | }
|
---|
| 17 | }
|
---|
| 18 | let nanoid = (size = 21) => {
|
---|
| 19 | let id = ''
|
---|
| 20 | let bytes = crypto.getRandomValues(new Uint8Array(size))
|
---|
| 21 | while (size--) {
|
---|
| 22 | let byte = bytes[size] & 63
|
---|
| 23 | if (byte < 36) {
|
---|
| 24 | id += byte.toString(36)
|
---|
| 25 | } else if (byte < 62) {
|
---|
| 26 | id += (byte - 26).toString(36).toUpperCase()
|
---|
| 27 | } else if (byte < 63) {
|
---|
| 28 | id += '_'
|
---|
| 29 | } else {
|
---|
| 30 | id += '-'
|
---|
| 31 | }
|
---|
| 32 | }
|
---|
| 33 | return Promise.resolve(id)
|
---|
| 34 | }
|
---|
| 35 | module.exports = { nanoid, customAlphabet, random }
|
---|
Note:
See
TracBrowser
for help on using the repository browser.