Last change
on this file since 6a80231 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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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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