@amplitude/analytics-core
Version:
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JavaScript
;
/**
* Source: [jed's gist's comment]{@link https://gist.github.com/jed/982883?permalink_comment_id=3223002#gistcomment-3223002}.
* Returns a random v4 UUID of the form xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx,
* where each x is replaced with a random hexadecimal digit from 0 to f, and
* y is replaced with a random hexadecimal digit from 8 to b.
* Used to generate UUIDs for deviceIds.
* @private
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.UUID = void 0;
var tslib_1 = require("tslib");
var global_scope_1 = require("../global-scope");
var legacyUUID = function (a) {
return a // if the placeholder was passed, return
? // a random number from 0 to 15
(a ^ // unless b is 8,
((Math.random() * // in which case
16) >> // a random number from
(a / 4))) // 8 to 11
.toString(16) // in hexadecimal
: // or otherwise a concatenated string:
(String(1e7) + // 10000000 +
String(-1e3) + // -1000 +
String(-4e3) + // -4000 +
String(-8e3) + // -80000000 +
String(-1e11)) // -100000000000,
.replace(
// replacing
/[018]/g, // zeroes, ones, and eights with
exports.UUID);
};
var hex = tslib_1.__spreadArray([], tslib_1.__read(Array(256).keys()), false).map(function (index) { return index.toString(16).padStart(2, '0'); });
var UUID = function (a) {
var _a;
var globalScope = (0, global_scope_1.getGlobalScope)();
/* istanbul ignore next */
if (!((_a = globalScope === null || globalScope === void 0 ? void 0 : globalScope.crypto) === null || _a === void 0 ? void 0 : _a.getRandomValues)) {
// Fallback to legacy UUID generation if crypto is not available
return legacyUUID(a);
}
var r = globalScope.crypto.getRandomValues(new Uint8Array(16));
r[6] = (r[6] & 0x0f) | 0x40;
r[8] = (r[8] & 0x3f) | 0x80;
return tslib_1.__spreadArray([], tslib_1.__read(r.entries()), false).map(function (_a) {
var _b = tslib_1.__read(_a, 2), index = _b[0], int = _b[1];
return ([4, 6, 8, 10].includes(index) ? "-".concat(hex[int]) : hex[int]);
}).join('');
};
exports.UUID = UUID;
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