CoastalCommitsPastes/client/lib/generate-uuid.ts
2022-11-09 23:11:36 -08:00

39 lines
1.2 KiB
TypeScript

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