Last change
on this file since 59329aa was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
initial commit
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Property mode
set to
100644
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File size:
981 bytes
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[6a3a178] | 1 | let random = bytes =>
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| 2 | Promise.resolve(crypto.getRandomValues(new Uint8Array(bytes)))
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| 3 | let customAlphabet = (alphabet, size) => {
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| 4 | let mask = (2 << (Math.log(alphabet.length - 1) / Math.LN2)) - 1
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| 5 | let step = -~((1.6 * mask * size) / alphabet.length)
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| 6 | return () => {
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| 7 | let id = ''
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| 8 | while (true) {
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| 9 | let bytes = crypto.getRandomValues(new Uint8Array(step))
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| 10 | let i = step
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| 11 | while (i--) {
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| 12 | id += alphabet[bytes[i] & mask] || ''
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| 13 | if (id.length === size) return Promise.resolve(id)
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| 14 | }
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| 15 | }
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| 16 | }
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| 17 | }
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| 18 | let nanoid = (size = 21) => {
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| 19 | let id = ''
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| 20 | let bytes = crypto.getRandomValues(new Uint8Array(size))
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| 21 | while (size--) {
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| 22 | let byte = bytes[size] & 63
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| 23 | if (byte < 36) {
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| 24 | id += byte.toString(36)
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| 25 | } else if (byte < 62) {
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| 26 | id += (byte - 26).toString(36).toUpperCase()
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| 27 | } else if (byte < 63) {
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| 28 | id += '_'
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| 29 | } else {
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| 30 | id += '-'
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| 31 | }
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| 32 | }
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| 33 | return Promise.resolve(id)
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| 34 | }
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| 35 | module.exports = { nanoid, customAlphabet, random }
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