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19 lines
No EOL
1 KiB
JavaScript
19 lines
No EOL
1 KiB
JavaScript
// Unique ID creation requires a high quality random # generator. In the browser we therefore
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// require the crypto API and do not support built-in fallback to lower quality random number
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// generators (like Math.random()).
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var getRandomValues;
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var rnds8 = new Uint8Array(16);
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export default function rng() {
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// lazy load so that environments that need to polyfill have a chance to do so
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if (!getRandomValues) {
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// getRandomValues needs to be invoked in a context where "this" is a Crypto implementation. Also,
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// find the complete implementation of crypto (msCrypto) on IE11.
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getRandomValues = typeof crypto !== 'undefined' && crypto.getRandomValues && crypto.getRandomValues.bind(crypto) || typeof msCrypto !== 'undefined' && typeof msCrypto.getRandomValues === 'function' && msCrypto.getRandomValues.bind(msCrypto);
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if (!getRandomValues) {
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throw new Error('crypto.getRandomValues() not supported. See https://github.com/uuidjs/uuid#getrandomvalues-not-supported');
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}
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}
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return getRandomValues(rnds8);
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} |