get-video-source-url.js

let params = args.queryParameters;
let input = params["input"];

let wv = new WebView();
await wv.loadURL(input);

await wv.waitForLoad();

let js = `
document.querySelector('video').src;
`
let output = await wv.evaluateJavaScript(js);

let data = Data.fromString(output);
let base64 = data.toBase64String();

let baseURL = params["x-success"];
let url = baseURL + "?base64=" + encodeURI(base64);
Safari.open(url);