60 lines
1.7 KiB
TypeScript
60 lines
1.7 KiB
TypeScript
import { handleJSONResponse } from 'api/utils';
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export const rateSymbols = ['USD', 'EUR', 'GBP', 'BTC', 'CHF', 'REP', 'ETH'];
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// TODO - internationalize
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const ERROR_MESSAGE = 'Could not fetch rate data.';
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const CCApi = 'https://min-api.cryptocompare.com';
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const CCRates = (symbols: string[]) => {
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const tsyms = rateSymbols.concat(symbols).join(',');
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return `${CCApi}/data/price?fsym=ETH&tsyms=${tsyms}`;
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};
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export interface CCResponse {
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[symbol: string]: {
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USD: number;
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EUR: number;
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GBP: number;
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BTC: number;
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CHF: number;
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REP: number;
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ETH: number;
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};
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}
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export const fetchRates = (symbols: string[] = []): Promise<CCResponse> =>
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fetch(CCRates(symbols))
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.then(response => handleJSONResponse(response, ERROR_MESSAGE))
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.then(rates => {
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// API errors come as 200s, so check the json for error
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if (rates.Response && rates.Response === 'Error') {
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throw new Error('Failed to fetch rates');
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}
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// All currencies are in ETH right now. We'll do token -> eth -> value to
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// do it all in one request
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// to their respective rates via ETH.
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return symbols.reduce(
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(eqRates, sym) => {
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if (rates[sym]) {
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eqRates[sym] = rateSymbols.reduce((symRates, rateSym) => {
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symRates[rateSym] = 1 / rates[sym] * rates[rateSym];
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return symRates;
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}, {});
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}
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return eqRates;
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},
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{
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ETH: {
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USD: rates.USD,
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EUR: rates.EUR,
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GBP: rates.GBP,
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BTC: rates.BTC,
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CHF: rates.CHF,
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REP: rates.REP,
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ETH: 1
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}
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}
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);
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});
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