mirror of https://github.com/OpenVidu/openvidu.git
56 lines
1.7 KiB
TypeScript
56 lines
1.7 KiB
TypeScript
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import { TZDate } from '@date-fns/tz';
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// Per-function entry points: the date-fns barrel takes most of a second to load and delays startup.
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import { startOfDay } from 'date-fns/startOfDay';
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import { startOfMonth } from 'date-fns/startOfMonth';
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const RELATIVE = /^now(?:-(\d+)([mhd])|\/([dM]))?$/;
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const UNIT_MS = { m: 60_000, h: 3_600_000, d: 86_400_000 } as const;
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/** True when `zone` is `UTC` or an IANA zone this runtime knows; numeric offsets are not zones. */
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export function isTimeZone(zone: string): boolean {
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if (/^[+-]\d/.test(zone)) {
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return false;
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}
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try {
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new Intl.DateTimeFormat('en-US', { timeZone: zone });
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return true;
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} catch {
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return false;
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}
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}
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/**
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* Resolves a time expression at `now`: ISO 8601 with offset or `Z`, `now`, `now-<n>m|h|d` (a duration back) or
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* `now/d` and `now/M` (start of the current day or month in `zone`). Returns undefined when it is neither.
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*/
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export function resolveTimeExpression(expression: string, now: Date, zone: string): Date | undefined {
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const relative = RELATIVE.exec(expression);
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if (relative) {
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const [, amount, unit, snap] = relative;
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if (amount !== undefined && unit !== undefined) {
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return new Date(now.getTime() - Number(amount) * UNIT_MS[unit as keyof typeof UNIT_MS]);
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}
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if (snap !== undefined) {
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const local = new TZDate(now.getTime(), zone);
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const start = snap === 'd' ? startOfDay(local) : startOfMonth(local);
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return new Date(start.getTime());
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}
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return new Date(now.getTime());
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}
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if (!/^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}(?::\d{2}(?:\.\d{1,9})?)?(?:Z|[+-]\d{2}:\d{2})$/.test(expression)) {
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return undefined;
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}
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const date = new Date(expression);
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return Number.isNaN(date.getTime()) ? undefined : date;
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}
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