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import { type RequestHandler } from 'express';
import { getLogger } from 'calypso/server/lib/logger';
/**
* Adds the `x-geoip-country-code` header to the request. This is used to simulate the header added
* in production environments, which is not available in all environments.
* @returns A middleware function that adds the `x-geoip-country-code` header to the request.
*/
export default function (): RequestHandler {
// To avoid delays on handling individual requests, fetch the geolocation once during server
// startup. This will retrieve the geolocation of the server (not the client), but it's expected
// that the middleware would be enabled on a developer's own machine.
let countryCode: string | undefined;
let countryCodePromise: Promise< string | undefined > | undefined;
async function getGeoCountryCode() {
if ( ! countryCode ) {
if ( ! countryCodePromise ) {
countryCodePromise = fetch( 'https://public-api.wordpress.com/geo/' )
.then( ( response ) => response.json() )
.then( ( { country_short } ) => country_short )
// Support offline development and set an expectation that the header is not
// always available by quietly skipping if the request fails.
.catch( () => {
getLogger().info( 'Failed to fetch geolocation' );
} );
}
countryCode = await countryCodePromise;
}
return countryCode;
}
// Prime the cache when the middleware is initialized.
getGeoCountryCode();
return async ( req, _res, next ) => {
const countryCode = await getGeoCountryCode();
if ( countryCode ) {
req.headers[ 'x-geoip-country-code' ] = countryCode;
}
next();
};
}
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