CloudFlare worker to retrieve the latest release from a repository and return to your worker endpoint

download-latest-from-github-releases-worker.js

addEventListener("fetch", event => {
  event.respondWith(fetchAndStream(event.request))
});


async function fetchAndStream() {
    const init = {
      headers: {
        "User-Agent": "CloudFlare Worker/v42",
      },
    };
    
    //Change here to match your repository and file extension
    let repo = 'my-user/my-repo';
    let extension = '.exe';
    
    let latest = await fetch('https://api.github.com/repos/' + repo + '/releases/latest', init);
    
    let jsonLatest = await latest.json();
    let assets     = jsonLatest.assets;
    let latestFile = assets.filter(a => a.browser_download_url.endsWith(extension))[0].browser_download_url;
    let fileName   = latestFile.substring(latestFile.lastIndexOf('/')+1);
    
    let response  = await fetch(latestFile,init);

    const responseInit = {
        headers: {
            'Content-Type': 'application/octet-stream',
            'Content-Disposition' : 'attachment; filename="' + fileName + '"'
        }
    };

    return new Response(response.body, responseInit)
}