cash.deno.dev v0.1.6

cmd.ts

import { opine } from 'https://deno.land/x/opine@2.1.4/mod.ts';
import { bold, italic, underline, gray, green, red } from 'https://deno.land/x/nanocolors@0.1.12/mod.ts';
import { plot } from 'https://deno.land/x/chart@1.0.1/mod.ts';

const VERSION = '0.1.6';
const DATA_URL = 'https://gist.github.com/10c8/8a4efb2d8512ae775e3ed911894fb642/raw/d18a9e26ce2eff5aca39090500009928265f7b66/data.json';
const APILAYER_URL = 'https://api.apilayer.com/exchangerates_data';

// API
const getNameForSymbol = async (symbol: string): Promise<string> => {
  const res = await fetch(DATA_URL);
  const data = await res.json();

  if (!data.symbols.hasOwnProperty(symbol)) {
    return symbol;
  }

  return data.symbols[symbol];
}

const convertFromTo = async (
  codeFrom: string,
  codeTo: string,
  amount: number
): Promise<{
  date: string;
  rate: string;
  amount: string;
}> => {
  const endpoint = `/convert?from=${codeFrom}&to=${codeTo}&amount=${amount}`;
  const headers = new Headers();
  headers.append('apikey', Deno.env.get('APILAYER_KEY'));

  try {
    const res = await fetch(APILAYER_URL + endpoint, {
      method: 'GET',
      redirect: 'follow',
      headers,
    });
    const data = await res.json();

    return {
      date: data.date.replaceAll('-', '/'),
      rate: data.info.rate,
      amount: data.result,
    };
  } catch (error) {
    console.log(error);
    return null;
  }
};

const timeseriesGraph = async (
  codeFrom: string,
  codeTo: string,
  startDate: Date,
  endDate: Date
): Promise<string> => {
  const start = startDate.toISOString().slice(0, 10);
  const end = endDate.toISOString().slice(0, 10);
  const endpoint = `/timeseries?start_date=${start}&end_date=${end}&base=${codeFrom}&symbols=${codeTo}`;

  const headers = new Headers();
  headers.append(
    'apikey',
    Deno.env.get('APILAYER_KEY') || 'ptzhB0zsVsbH66DyM7DdRMOZonUPjSLL'
  );

  try {
    const res = await fetch(APILAYER_URL + endpoint, {
      method: 'GET',
      redirect: 'follow',
      headers,
    });
    const data = await res.json();

    try {
      const points = Object.values(data.rates).map(x => x[codeTo.toUpperCase()]);
      const graph = plot(points, {
        colors: ['green'],
        height: 8,
      });

      return graph.split('\n').map(x => x.substring(4)).join('\n') + '\n';
    } catch (error) {
      console.log(error);
      return null;
    }
  } catch (error) {
    console.log(error);
    return null;
  }
};

// Main code
const app = opine();

const errorMessage = (_req, res) => {
  const message = [
    red('Hmm, looks like something went wrong. Try again later.'),
    '',
    bold(italic(green('cash.deno.dev') + ' ' + gray(`by 10c8 | ver ${VERSION}`))),
  ];

  res.append('Content-Type', 'text/plain');
  res.send(message.join('\n') + '\n');
};

const usageMessage = async (_req, res) => {
  const message = [
    bold('Usage:'),
    '  curl -L cash.deno.dev/<FROM>/<TO>/<AMOUNT>[/<OPTIONS>]',
    '',
    bold('Options:'),
    '  p\tPlots the exchange rate for the last 30 days to a graph.',
    '',
    bold('Example:'),
    '  curl -L cash.deno.dev/USD/GBP/500/p',
    '',
    bold(italic(green('cash.deno.dev') + ' ' + gray(`by 10c8 | ver ${VERSION}`))),
  ];

  res.append('Content-Type', 'text/plain');
  res.send(message.join('\n') + '\n');
};

const mainRoute = async (req, res) => {
  const { codeFrom, codeTo, amount, optionList } = req.params;
  const options = {
    plot: false,
  };

  if (optionList != null) {
    const optionsArray = optionList.toUpperCase().split('');
    options.plot = optionsArray.includes('P');
  }

  if (codeFrom == null || codeTo == null || amount == null) {
    return usageMessage(req, res);
  }

  const result = await convertFromTo(codeFrom, codeTo, amount);
  
  if (!result) {
    return errorMessage(req, res);
  }

  // Get the currency name for each symbol
  const nameFrom = await getNameForSymbol(codeFrom.toUpperCase());
  const nameTo = await getNameForSymbol(codeTo.toUpperCase());

  const message = [
    `${bold(underline(nameFrom))} to ${bold(underline(nameTo))}`,
    `${bold('Rate:')} ${result.rate}`,
    '',
    `${amount} ${codeFrom.toUpperCase()} ${italic(gray('->'))} ${result.amount} ${codeTo.toUpperCase()}`,
    '',
    bold(italic(green('cash.deno.dev') + ' ' + gray(`by 10c8 | ver ${VERSION} [data for ${result.date}]`))),
  ];

  if (options.plot) {
    // Generate price history graph
    const graphDateTo = new Date(`${result.date.replaceAll('/', '-')}T00:00:00`);
    const graphDateFrom = new Date();
    graphDateFrom.setDate(graphDateTo.getDate() - 29);
    
    const graph = await timeseriesGraph(codeFrom, codeTo, graphDateFrom, graphDateTo);

    if (graph !== null) {
      message.splice(3, 0, graph);
    }
  }

  res.append('Content-Type', 'text/plain');
  res.send(message.join('\n') + '\n');
};

app.get('/:codeFrom/:codeTo/:amount/:optionList', mainRoute);
app.get('/:codeFrom/:codeTo/:amount', mainRoute);
app.get('/*', usageMessage);

app.listen(
  8000,
  () => console.log('Server has started on http://localhost:8000 🚀'),
);

data.json

{
  "symbols": {
    "AED": "United Arab Emirates Dirham",
    "AFN": "Afghan Afghani",
    "ALL": "Albanian Lek",
    "AMD": "Armenian Dram",
    "ANG": "Netherlands Antillean Guilder",
    "AOA": "Angolan Kwanza",
    "ARS": "Argentine Peso",
    "AUD": "Australian Dollar",
    "AWG": "Aruban Florin",
    "AZN": "Azerbaijani Manat",
    "BAM": "Bosnia-Herzegovina Convertible Mark",
    "BBD": "Barbadian Dollar",
    "BDT": "Bangladeshi Taka",
    "BGN": "Bulgarian Lev",
    "BHD": "Bahraini Dinar",
    "BIF": "Burundian Franc",
    "BMD": "Bermudan Dollar",
    "BND": "Brunei Dollar",
    "BOB": "Bolivian Boliviano",
    "BRL": "Brazilian Real",
    "BSD": "Bahamian Dollar",
    "BTC": "Bitcoin",
    "BTN": "Bhutanese Ngultrum",
    "BWP": "Botswanan Pula",
    "BYN": "New Belarusian Ruble",
    "BYR": "Belarusian Ruble",
    "BZD": "Belize Dollar",
    "CAD": "Canadian Dollar",
    "CDF": "Congolese Franc",
    "CHF": "Swiss Franc",
    "CLF": "Chilean Unit of Account (UF)",
    "CLP": "Chilean Peso",
    "CNY": "Chinese Yuan",
    "COP": "Colombian Peso",
    "CRC": "Costa Rican Col\u00f3n",
    "CUC": "Cuban Convertible Peso",
    "CUP": "Cuban Peso",
    "CVE": "Cape Verdean Escudo",
    "CZK": "Czech Republic Koruna",
    "DJF": "Djiboutian Franc",
    "DKK": "Danish Krone",
    "DOP": "Dominican Peso",
    "DZD": "Algerian Dinar",
    "EGP": "Egyptian Pound",
    "ERN": "Eritrean Nakfa",
    "ETB": "Ethiopian Birr",
    "EUR": "Euro",
    "FJD": "Fijian Dollar",
    "FKP": "Falkland Islands Pound",
    "GBP": "British Pound Sterling",
    "GEL": "Georgian Lari",
    "GGP": "Guernsey Pound",
    "GHS": "Ghanaian Cedi",
    "GIP": "Gibraltar Pound",
    "GMD": "Gambian Dalasi",
    "GNF": "Guinean Franc",
    "GTQ": "Guatemalan Quetzal",
    "GYD": "Guyanaese Dollar",
    "HKD": "Hong Kong Dollar",
    "HNL": "Honduran Lempira",
    "HRK": "Croatian Kuna",
    "HTG": "Haitian Gourde",
    "HUF": "Hungarian Forint",
    "IDR": "Indonesian Rupiah",
    "ILS": "Israeli New Sheqel",
    "IMP": "Manx pound",
    "INR": "Indian Rupee",
    "IQD": "Iraqi Dinar",
    "IRR": "Iranian Rial",
    "ISK": "Icelandic Kr\u00f3na",
    "JEP": "Jersey Pound",
    "JMD": "Jamaican Dollar",
    "JOD": "Jordanian Dinar",
    "JPY": "Japanese Yen",
    "KES": "Kenyan Shilling",
    "KGS": "Kyrgystani Som",
    "KHR": "Cambodian Riel",
    "KMF": "Comorian Franc",
    "KPW": "North Korean Won",
    "KRW": "South Korean Won",
    "KWD": "Kuwaiti Dinar",
    "KYD": "Cayman Islands Dollar",
    "KZT": "Kazakhstani Tenge",
    "LAK": "Laotian Kip",
    "LBP": "Lebanese Pound",
    "LKR": "Sri Lankan Rupee",
    "LRD": "Liberian Dollar",
    "LSL": "Lesotho Loti",
    "LTL": "Lithuanian Litas",
    "LVL": "Latvian Lats",
    "LYD": "Libyan Dinar",
    "MAD": "Moroccan Dirham",
    "MDL": "Moldovan Leu",
    "MGA": "Malagasy Ariary",
    "MKD": "Macedonian Denar",
    "MMK": "Myanma Kyat",
    "MNT": "Mongolian Tugrik",
    "MOP": "Macanese Pataca",
    "MRO": "Mauritanian Ouguiya",
    "MUR": "Mauritian Rupee",
    "MVR": "Maldivian Rufiyaa",
    "MWK": "Malawian Kwacha",
    "MXN": "Mexican Peso",
    "MYR": "Malaysian Ringgit",
    "MZN": "Mozambican Metical",
    "NAD": "Namibian Dollar",
    "NGN": "Nigerian Naira",
    "NIO": "Nicaraguan C\u00f3rdoba",
    "NOK": "Norwegian Krone",
    "NPR": "Nepalese Rupee",
    "NZD": "New Zealand Dollar",
    "OMR": "Omani Rial",
    "PAB": "Panamanian Balboa",
    "PEN": "Peruvian Nuevo Sol",
    "PGK": "Papua New Guinean Kina",
    "PHP": "Philippine Peso",
    "PKR": "Pakistani Rupee",
    "PLN": "Polish Zloty",
    "PYG": "Paraguayan Guarani",
    "QAR": "Qatari Rial",
    "RON": "Romanian Leu",
    "RSD": "Serbian Dinar",
    "RUB": "Russian Ruble",
    "RWF": "Rwandan Franc",
    "SAR": "Saudi Riyal",
    "SBD": "Solomon Islands Dollar",
    "SCR": "Seychellois Rupee",
    "SDG": "Sudanese Pound",
    "SEK": "Swedish Krona",
    "SGD": "Singapore Dollar",
    "SHP": "Saint Helena Pound",
    "SLL": "Sierra Leonean Leone",
    "SOS": "Somali Shilling",
    "SRD": "Surinamese Dollar",
    "STD": "S\u00e3o Tom\u00e9 and Pr\u00edncipe Dobra",
    "SVC": "Salvadoran Col\u00f3n",
    "SYP": "Syrian Pound",
    "SZL": "Swazi Lilangeni",
    "THB": "Thai Baht",
    "TJS": "Tajikistani Somoni",
    "TMT": "Turkmenistani Manat",
    "TND": "Tunisian Dinar",
    "TOP": "Tongan Pa\u02bbanga",
    "TRY": "Turkish Lira",
    "TTD": "Trinidad and Tobago Dollar",
    "TWD": "New Taiwan Dollar",
    "TZS": "Tanzanian Shilling",
    "UAH": "Ukrainian Hryvnia",
    "UGX": "Ugandan Shilling",
    "USD": "United States Dollar",
    "UYU": "Uruguayan Peso",
    "UZS": "Uzbekistan Som",
    "VEF": "Venezuelan Bol\u00edvar Fuerte",
    "VND": "Vietnamese Dong",
    "VUV": "Vanuatu Vatu",
    "WST": "Samoan Tala",
    "XAF": "CFA Franc BEAC",
    "XAG": "Silver (troy ounce)",
    "XAU": "Gold (troy ounce)",
    "XCD": "East Caribbean Dollar",
    "XDR": "Special Drawing Rights",
    "XOF": "CFA Franc BCEAO",
    "XPF": "CFP Franc",
    "YER": "Yemeni Rial",
    "ZAR": "South African Rand",
    "ZMK": "Zambian Kwacha (pre-2013)",
    "ZMW": "Zambian Kwacha",
    "ZWL": "Zimbabwean Dollar"
  }
}