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Make uuid v4 rfc4122 compliant (denoland/deno_std#580)

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Original: ba69f1ea14
This commit is contained in:
Nimalan 2019-09-11 22:04:44 +05:30 committed by Ryan Dahl
parent 8d355908ab
commit 08087e921e
1 changed files with 21 additions and 5 deletions
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26
uuid/v4.ts
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@ -10,10 +10,26 @@ export function validate(id: string): boolean {
} }
export default function generate(): string { export default function generate(): string {
return "00000000-0000-4000-8000-000000000000".replace( const rnds = crypto.getRandomValues(new Uint8Array(16));
/[0]/g,
(): string => rnds[6] = (rnds[6] & 0x0f) | 0x40; // Version 4
// random integer from 0 to 15 as a hex digit. rnds[8] = (rnds[8] & 0x3f) | 0x80; // Variant 10
(crypto.getRandomValues(new Uint8Array(1))[0] % 16).toString(16)
const bits: string[] = [...rnds].map(
(bit): string => {
const s: string = bit.toString(16);
return bit < 0x10 ? "0" + s : s;
}
); );
return [
...bits.slice(0, 4),
"-",
...bits.slice(4, 6),
"-",
...bits.slice(6, 8),
"-",
...bits.slice(8, 10),
"-",
...bits.slice(10)
].join("");
} }