dokku-prerender/blockResources.js at main · PythonicCafe/dokku-prerender · GitHub

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const blockedResources = [
  "google-analytics.com",
  "api.mixpanel.com",
  "fonts.googleapis.com",
  "stats.g.doubleclick.net",
  "mc.yandex.ru",
  "use.typekit.net",
  "beacon.tapfiliate.com",
  "js-agent.newrelic.com",
  "api.segment.io",
  "woopra.com",
  "static.olark.com",
  "static.getclicky.com",
  "fast.fonts.com",
  "youtube.com/embed",
  "cdn.heapanalytics.com",
  "googleads.g.doubleclick.net",
  "pagead2.googlesyndication.com",
  "fullstory.com/rec",
  "navilytics.com/nls_ajax.php",
  "log.optimizely.com/event",
  "hn.inspectlet.com",
  "tpc.googlesyndication.com",
  "partner.googleadservices.com",
  ".ttf",
  ".eot",
  ".otf",
  ".woff",
  ".png",
  ".gif",
  ".tiff",
  ".pdf",
  ".jpg",
  ".jpeg",
  ".ico",
  ".svg",
];

module.exports = {
  tabCreated: (req, res, next) => {
    req.prerender.tab.Network.setRequestInterception({
      patterns: [{ urlPattern: "*" }],
    }).then(() => {
      next();
    });

    req.prerender.tab.Network.requestIntercepted(
      ({ interceptionId, request }) => {
        let shouldBlock = false;

        if (req.prerender.url !== request.url) {
          blockedResources.forEach((substring) => {
            if (request.url.indexOf(substring) >= 0) {
              shouldBlock = true;
            }
          });
        }

        let interceptOptions = { interceptionId };
        if (shouldBlock) {
          interceptOptions.errorReason = "Aborted";
        }

        req.prerender.tab.Network.continueInterceptedRequest(
          interceptOptions,
        ).catch((error) => {
          console.log(
            "[blockResources] Error continuing intercepted request",
            error,
          );
        });
      },
    );
  },
};