@appsemble/node-utils/server/routes/appRouter/serviceWorkerHandler.js

NodeJS utilities used by Appsemble internally.

import { createHash } from 'node:crypto';
import { readFile } from 'node:fs/promises';
export function createServiceWorkerHandler() {
    return async (ctx) => {
        const production = process.env.NODE_ENV === 'production';
        const filename = production ? '/service-worker.js' : '/app/service-worker.js';
        const serviceWorker = await (production
            ? readFile(new URL('../../../../../dist/app/service-worker.js', import.meta.url), 'utf8')
            : ctx.fs.promises.readFile(filename, 'utf8'));
        ctx.type = 'application/javascript';
        // Browsers bypass their HTTP cache when checking for service worker updates, so a strong ETag
        // lets them revalidate with a 304 instead of downloading the full script on every check.
        ctx.set('etag', `"${createHash('sha256').update(serviceWorker).digest('base64url')}"`);
        ctx.set('cache-control', 'no-cache');
        ctx.status = 200;
        if (ctx.fresh) {
            ctx.status = 304;
        }
        else {
            ctx.body = serviceWorker;
        }
    };
}
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