Userscript to facilitate bypassing the (UK) region lock on radio.garden

radio.garden-region-bypass.user.js

// ==UserScript==
// @name        radio.garden: bypass region restrictions (e.g. UK)
// @namespace   dqne.me.radio.garden
// @match       http://radio.garden/*
// @grant       none
// @version     1.0
// @author      Dan Q <https://danq.me/>
// @description Adds a secondary player interface to radio.garden which still works even on region-blocked radio stations. Allows listening to non-UK stations from the UK.
// @run-at      document-idle
// ==/UserScript==

const root = document.querySelector(':root');
root.style.setProperty('--playbar-height', '150px');
root.style.setProperty('--desktop-ui-width', '350px');

let secondaryPlayer;

function addSecondaryPlayer(src){
  const primaryPlayer = document.querySelector('[class^="_leftSide_"]');
  if(!primaryPlayer) return;
  let secondaryPlayer = document.getElementById('radio-garden-bypass-secondary-player');
  if(!secondaryPlayer){
    secondaryPlayer = document.createElement('audio');
    secondaryPlayer.id = 'radio-garden-bypass-secondary-player';
    secondaryPlayer.controls = true;
  }
  secondaryPlayer.src = src;
  primaryPlayer.appendChild(secondaryPlayer);
  secondaryPlayer.play();
}

window.fetch = new Proxy(window.fetch, {
  apply: (target, that, args)=>{
    const tmp = target.apply(that, args);
    tmp.then(res=>{
      const matches = res.url.match(/\/api\/ara\/content\/channel\/(.*)/);
      if(matches){
        const stationId = matches[1];
        addSecondaryPlayer(`http://radio.garden/api/ara/content/listen/${stationId}/channel.mp3`);
        res.json(); // break the original so we don't tune in twice!
      }
    });
    return tmp;
  },
});