528e55991b
- Auth: pessimistic locking on login tokens and refresh token rotation, backup code attempt counter, rate limiting verification - Schema: unique constraints on business numbers, FK relations, unsigned/signed alignment, attendance duplicate prevention - Invoices/PDFs: DOMPurify sanitization, bounded queries in stats and alerts, VAT rounding, Puppeteer error handling - Orders/Offers: transactional parent+child creation, Zod NaN refinement, status enums, uniqueness checks - Projects/Files: path traversal protection, streamed uploads, permission guards, query param validation - Attendance/HR: duplicate checks, ownership validation, GPS restrictions, trip distance validation - Frontend: modal lock reference counting, XSS escaping in print HTML, ref mutation fixes, accessibility attributes Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
68 lines
1.9 KiB
TypeScript
68 lines
1.9 KiB
TypeScript
/**
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* Czech National Bank (ČNB) exchange rate service.
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* Fetches daily rates and caches them.
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* API: https://api.cnb.cz/cnbapi/exrates/daily
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*/
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interface CnbRate {
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currencyCode: string;
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rate: number;
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amount: number;
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}
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const rateCache: Record<string, Record<string, number>> = {};
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async function fetchRatesForDate(
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date?: string,
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): Promise<Record<string, number>> {
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const key = date || "today";
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if (rateCache[key]) return rateCache[key];
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try {
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let url = "https://api.cnb.cz/cnbapi/exrates/daily?lang=EN";
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if (date) url += `&date=${date}`;
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const response = await fetch(url);
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if (!response.ok) throw new Error(`CNB API: ${response.status}`);
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const data = (await response.json()) as { rates: CnbRate[] };
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const rates: Record<string, number> = { CZK: 1 };
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for (const r of data.rates) {
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rates[r.currencyCode] = r.rate / r.amount;
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}
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rateCache[key] = rates;
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return rates;
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} catch (err) {
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console.error("Failed to fetch CNB exchange rates:", err);
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if (rateCache["today"]) return rateCache["today"];
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throw new Error("Nepodařilo se získat aktuální kurzy z ČNB");
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}
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}
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/** Convert an amount from a given currency to CZK using CNB rates */
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export async function toCzk(
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amount: number,
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currency: string,
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date?: string,
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): Promise<number> {
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if (currency === "CZK") return amount;
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const rates = await fetchRatesForDate(date);
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const rate = rates[currency];
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if (!rate) throw new Error(`Neznámá měna: ${currency}`);
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return Math.round(amount * rate * 100) / 100;
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}
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/** Get CNB rate for a currency (CZK per 1 unit), optionally for a specific date */
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export async function getRate(
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currency: string,
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date?: string,
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): Promise<number> {
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if (currency === "CZK") return 1;
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const rates = await fetchRatesForDate(date);
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const rate = rates[currency];
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if (!rate) throw new Error(`Neznámá měna: ${currency}`);
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return rate;
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}
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