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import { type Request, type Response } from 'express';
import middlewareGeoipHeader from '../geoip-header';
const mockInfo = jest.fn();
jest.mock( 'calypso/server/lib/logger', () => ( {
getLogger: jest.fn().mockImplementation( () => ( { info: mockInfo } ) ),
} ) );
describe( 'geoip-header middleware', () => {
let request: Request;
let response: Response;
beforeEach( () => {
jest.clearAllMocks();
jest.spyOn( global, 'fetch' );
request = { headers: {} } as Request;
response = {} as Response;
} );
it( 'should fetch country code on initialization', async () => {
const { promise, resolve } = Promise.withResolvers< void >();
( global.fetch as jest.Mock ).mockImplementation( () => {
resolve();
return Promise.resolve( {
json: () => Promise.resolve( { country_short: 'US' } ),
} );
} );
middlewareGeoipHeader();
await promise;
expect( global.fetch ).toHaveBeenCalledTimes( 1 );
expect( global.fetch ).toHaveBeenCalledWith( 'https://public-api.wordpress.com/geo/' );
} );
it( 'should add country code header to request when available', async () => {
( global.fetch as jest.Mock ).mockResolvedValueOnce( {
json: () => Promise.resolve( { country_short: 'US' } ),
} );
const next = jest.fn();
const middleware = middlewareGeoipHeader();
await middleware( request, response, next );
expect( request.headers[ 'x-geoip-country-code' ] ).toBe( 'US' );
expect( next ).toHaveBeenCalled();
} );
it( 'should not add header when country code is not available', async () => {
( global.fetch as jest.Mock ).mockRejectedValueOnce( new Error( 'Network error' ) );
const next = jest.fn();
const middleware = middlewareGeoipHeader();
await middleware( request, response, next );
expect( request.headers[ 'x-geoip-country-code' ] ).toBeUndefined();
expect( next ).toHaveBeenCalled();
expect( mockInfo ).toHaveBeenCalledWith( 'Failed to fetch geolocation' );
} );
it( 'should avoid duplicate requests when country code is available', async () => {
( global.fetch as jest.Mock ).mockResolvedValueOnce( {
json: () => Promise.resolve( { country_short: 'US' } ),
} );
const next = jest.fn();
const middleware = middlewareGeoipHeader();
await middleware( request, response, next );
await middleware( request, response, next );
await middleware( request, response, next );
expect( global.fetch ).toHaveBeenCalledTimes( 1 );
} );
it( 'should not re-fetch on next request if previous fetch failed', async () => {
( global.fetch as jest.Mock ).mockRejectedValue( new Error( 'Network error' ) );
const next = jest.fn();
const middleware = middlewareGeoipHeader();
const req1 = { headers: {} } as Request;
await middleware( req1, response, next );
expect( req1.headers[ 'x-geoip-country-code' ] ).toBeUndefined();
expect( mockInfo ).toHaveBeenCalledWith( 'Failed to fetch geolocation' );
const req2 = { headers: {} } as Request;
await middleware( req2, response, next );
expect( global.fetch ).toHaveBeenCalledTimes( 1 );
expect( mockInfo ).toHaveBeenCalledTimes( 1 );
expect( req2.headers[ 'x-geoip-country-code' ] ).toBeUndefined();
} );
} );
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