server.js

import { createRequestHandler } from '@remix-run/netlify';
import * as build from '@remix-run/dev/server-build';

/*
 * Returns a context object with at most 3 keys:
 *  - `netlifyGraphToken`: raw authentication token to use with Netlify Graph
 *  - `clientNetlifyGraphAccessToken`: For use with JWTs generated by
 *    `netlify-graph-auth`.
 *  - `netlifyGraphSignature`: a signature for subscription events. Will be
 *    present if a secret is set.
 */
function getLoadContext(event, context) {
	let rawAuthorizationString;
	let netlifyGraphToken;

	if (event.authlifyToken != null) {
		netlifyGraphToken = event.authlifyToken;
	}

	const authHeader = event.headers.authorization;
	const graphSignatureHeader = event.headers['x-netlify-graph-signature'];

	if (authHeader != null && /Bearer /gi.test(authHeader)) {
		rawAuthorizationString = authHeader.split(' ')[1];
	}

	const loadContext = {
		clientNetlifyGraphAccessToken: rawAuthorizationString,
		netlifyGraphToken,
		netlifyGraphSignature: graphSignatureHeader
	};

	// Remove keys with undefined values
	Object.keys(loadContext).forEach((key) => {
		if (loadContext[key] == null) {
			delete loadContext[key];
		}
	});

	return loadContext;
}

export const handler = createRequestHandler({
	build,
	getLoadContext,
	mode: process.env.NODE_ENV
});