@shopify/shopify-app-react-router/dist/esm/server/authenticate/helpers/ensure-cors-headers.mjs

Shopify React Router - to simplify the building of Shopify Apps with React Router

import { REAUTH_URL_HEADER } from '../const.mjs';

function ensureCORSHeadersFactory(params, request, corsHeaders = []) {
    const { logger, config } = params;
    return function ensureCORSHeaders(response) {
        const origin = request.headers.get('Origin');
        if (origin && origin !== config.appUrl) {
            logger.debug('Request comes from a different origin, adding CORS headers');
            const corsHeadersSet = new Set([
                'Authorization',
                'Content-Type',
                ...corsHeaders,
            ]);
            response.headers.set('Access-Control-Allow-Origin', '*');
            response.headers.set('Access-Control-Allow-Headers', [...corsHeadersSet].join(', '));
            response.headers.set('Access-Control-Expose-Headers', REAUTH_URL_HEADER);
        }
        return response;
    };
}

export { ensureCORSHeadersFactory };
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