source.js

// No authentication. demonstrate POST with data in body
// callgraphql api: https://github.com/trevorblades/countries
// docs: https://trevorblades.github.io/countries/queries/continent

// make HTTP request
const countryCode = args[0];
const url = "https://countries.trevorblades.com/";
console.log(`Get name, capital and currency for country code: ${countryCode}`);
console.log(`HTTP POST Request to ${url}`);
const countryRequest = Functions.makeHttpRequest({
  url: url,
  method: "POST",
  headers: {
    "Content-Type": "application/json",
  },
  data: {
    query: `{\
        country(code: "${countryCode}") { \
          name \
          capital \
          currency \
        } \
      }`,
  },
});

// Execute the API request (Promise)
const countryResponse = await countryRequest;
if (countryResponse.error) {
  console.error(
    countryResponse.response
      ? `${countryResponse.response.status},${countryResponse.response.statusText}`
      : ""
  );
  throw Error("Request failed");
}

const countryData = countryResponse["data"]["data"];

if (!countryData || !countryData.country) {
  throw Error(`Make sure the country code "${countryCode}" exists`);
}

console.log("country response", countryData);

// result is in JSON object
const result = {
  name: countryData.country.name,
  capital: countryData.country.capital,
  currency: countryData.country.currency,
};

// Use JSON.stringify() to convert from JSON object to JSON string
// Finally, use the helper Functions.encodeString() to encode from string to bytes
return Functions.encodeString(JSON.stringify(result));