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const HEX = "0123456789abcdef";
function hexChar(n: number): string {
return HEX.charAt(n & 0xf);
}
function hexFromBytes(bytes: Uint8Array): string {
let out = "";
for (let i = 0; i < bytes.length; i++) {
const b = bytes[i] as number;
out += hexChar(b >> 4);
out += hexChar(b);
}
return out;
}
function formatV4(rand: Uint8Array): string {
const h = hexFromBytes(rand);
return (
h.slice(0, 8) +
"-" +
h.slice(8, 12) +
"-4" +
h.slice(13, 16) +
"-" +
((parseInt(h.slice(16, 18), 16) & 0x3f) | 0x80).toString(16).padStart(2, "0") +
h.slice(18, 20) +
"-" +
h.slice(20, 32)
);
}
function uuidFromGetRandomValues(): string {
const buf = new Uint8Array(16);
crypto.getRandomValues(buf);
buf[6] = ((buf[6] as number) & 0x0f) | 0x40;
buf[8] = ((buf[8] as number) & 0x3f) | 0x80;
return formatV4(buf);
}
function uuidFromMathRandom(): string {
let s = "";
for (let i = 0; i < 36; i++) {
if (i === 8 || i === 13 || i === 18 || i === 23) {
s += "-";
} else if (i === 14) {
s += "4";
} else if (i === 19) {
s += hexChar(Math.floor(Math.random() * 4) + 8);
} else {
s += hexChar(Math.floor(Math.random() * 16));
}
}
return s;
}
export function randomId(): string {
if (typeof crypto !== "undefined" && typeof crypto.randomUUID === "function") {
return crypto.randomUUID();
}
if (typeof crypto !== "undefined" && typeof crypto.getRandomValues === "function") {
return uuidFromGetRandomValues();
}
return uuidFromMathRandom();
}
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