This approves someone to join your meeting, and logs it to a http server backend.. without further controls.. use at your own risk

automatically_approve_hangouts_meet_participants.js

const Http = new XMLHttpRequest();

setInterval(() => {

  // Lets find if someone is waiting to join:
  // If yes, it would exist an element with the following text inside it:
  let string = "Alguém quer participar desta reunião"

  ask_for_approval_element = document.evaluate('//*[text()="' + string + '"]', document, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE).snapshotItem(0)

  if (ask_for_approval_element) {
    // Okay, it seems someone is wanting to join!

    // Finds out the name of who's asking to join:
    // It should be inside the div element which has the attribute 'data-participant-id'

    name_element = document.querySelectorAll('[data-participant-id]');
    if (name_element[0]) {
      // The name element seems to be there
      let participant_name = name_element[0].innerText

      // Log it to another place:
      url='http://localhost:8000/&date="' + new Date().toJSON() + '"&participant="' + participant_name + '"';
      Http.open("GET", url);
      Http.send();
    }

    // Finds the Allow button in order to click it
    string = "Permitir"

    allowBtn = document.evaluate('//*[text()="' + string + '"]', ask_for_approval_element, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE).snapshotItem(0)

    if (allowBtn){
      // There's a button to allow, allowing
      allowBtn.click()
    }
  }
}, 500)