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40 lines
1.2 KiB
TypeScript
40 lines
1.2 KiB
TypeScript
export default function generateUUID() {
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if (typeof crypto === "object") {
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if (typeof crypto.randomUUID === "function") {
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// https://developer.mozilla.org/en-US/docs/Web/API/Crypto/randomUUID
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return crypto.randomUUID()
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}
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if (
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typeof crypto.getRandomValues === "function" &&
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typeof Uint8Array === "function"
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) {
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// https://stackoverflow.com/questions/105034/how-to-create-a-guid-uuid
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const callback = (c: string) => {
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const num = Number(c)
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return (
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num ^
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(crypto.getRandomValues(new Uint8Array(1))[0] & (15 >> (num / 4)))
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).toString(16)
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}
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return "10000000-1000-4000-8000-100000000000".replace(/[018]/g, callback)
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}
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}
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let timestamp = new Date().getTime()
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let perforNow =
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(typeof performance !== "undefined" &&
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performance.now &&
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performance.now() * 1000) ||
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0
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return "xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx".replace(/[xy]/g, (c) => {
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let random = Math.random() * 16
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if (timestamp > 0) {
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random = (timestamp + random) % 16 | 0
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timestamp = Math.floor(timestamp / 16)
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} else {
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random = (perforNow + random) % 16 | 0
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perforNow = Math.floor(perforNow / 16)
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}
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return (c === "x" ? random : (random & 0x3) | 0x8).toString(16)
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})
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}
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