57 lines
1.8 KiB
JavaScript
57 lines
1.8 KiB
JavaScript
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export const generateUuid = (function () {
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// use `randomUUID` if possible
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if (typeof crypto === 'object' && typeof crypto.randomUUID === 'function') {
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return crypto.randomUUID.bind(crypto);
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}
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// use `randomValues` if possible
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let getRandomValues;
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if (typeof crypto === 'object' && typeof crypto.getRandomValues === 'function') {
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getRandomValues = crypto.getRandomValues.bind(crypto);
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}
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else {
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getRandomValues = function (bucket) {
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for (let i = 0; i < bucket.length; i++) {
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bucket[i] = Math.floor(Math.random() * 256);
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}
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return bucket;
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};
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}
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// prep-work
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const _data = new Uint8Array(16);
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const _hex = [];
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for (let i = 0; i < 256; i++) {
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_hex.push(i.toString(16).padStart(2, '0'));
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}
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return function generateUuid() {
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// get data
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getRandomValues(_data);
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// set version bits
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_data[6] = (_data[6] & 0x0f) | 0x40;
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_data[8] = (_data[8] & 0x3f) | 0x80;
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// print as string
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let i = 0;
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let result = '';
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result += _hex[_data[i++]];
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result += _hex[_data[i++]];
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result += _hex[_data[i++]];
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result += _hex[_data[i++]];
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result += '-';
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result += _hex[_data[i++]];
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result += _hex[_data[i++]];
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result += '-';
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result += _hex[_data[i++]];
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result += _hex[_data[i++]];
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result += '-';
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result += _hex[_data[i++]];
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result += _hex[_data[i++]];
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result += '-';
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result += _hex[_data[i++]];
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result += _hex[_data[i++]];
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result += _hex[_data[i++]];
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result += _hex[_data[i++]];
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result += _hex[_data[i++]];
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result += _hex[_data[i++]];
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return result;
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};
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})();
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