30 lines
1.3 KiB
TypeScript
30 lines
1.3 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);
|
|
});
|
|
};
|
|
|