File: ../packages/store/src/-private/utils/uuid-polyfill.ts
/**
@module @ember-data/store
*/
interface FastbootCrypto {
randomFillSync(v: Uint8Array): Uint8Array;
}
type UUIDv4 = `${string}-${string}-${string}-${string}-${string}`;
export default function installPolyfill() {
const isFastBoot = typeof FastBoot !== 'undefined';
const CRYPTO: Crypto = isFastBoot ? (FastBoot.require('crypto') as Crypto) : window.crypto;
if (!CRYPTO.randomUUID) {
// we might be able to optimize this by requesting more bytes than we need at a time
const rng = function (): Uint8Array {
// WHATWG crypto RNG - http://wiki.whatwg.org/wiki/Crypto
const rnds8 = new Uint8Array(16);
if (!CRYPTO.getRandomValues && !isFastBoot) {
throw new Error(`Unable to generate bytes for UUID`);
}
return CRYPTO.getRandomValues
? CRYPTO.getRandomValues(rnds8)
: (CRYPTO as unknown as FastbootCrypto).randomFillSync(rnds8);
};
/*
* Convert array of 16 byte values to UUID string format of the form:
* XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
*/
const byteToHex: string[] = [];
for (let i = 0; i < 256; ++i) {
byteToHex[i] = (i + 0x100).toString(16).substr(1);
}
const bytesToUuid = function (buf: Uint8Array): UUIDv4 {
const bth = byteToHex;
// join used to fix memory issue caused by concatenation: https://bugs.chromium.org/p/v8/issues/detail?id=3175#c4
return [
bth[buf[0]],
bth[buf[1]],
bth[buf[2]],
bth[buf[3]],
'-',
bth[buf[4]],
bth[buf[5]],
'-',
bth[buf[6]],
bth[buf[7]],
'-',
bth[buf[8]],
bth[buf[9]],
'-',
bth[buf[10]],
bth[buf[11]],
bth[buf[12]],
bth[buf[13]],
bth[buf[14]],
bth[buf[15]],
].join('') as UUIDv4;
};
CRYPTO.randomUUID = function uuidv4(): UUIDv4 {
const rnds = rng();
// Per 4.4, set bits for version and `clock_seq_hi_and_reserved`
rnds[6] = (rnds[6] & 0x0f) | 0x40;
rnds[8] = (rnds[8] & 0x3f) | 0x80;
return bytesToUuid(rnds);
};
}
}