Hangout push to talk.

talkie.js

// ==UserScript==
// @name         talkie
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Safe talking on hangout
// @author       You
// @match        https://hangouts.google.com/u/*/call/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';
    const activateLabel = '[aria-label="Activer le micro"]'
    const deactivateLabel = '[aria-label="Désactiver le micro"]'
    const keyCode = "Space"
    window.button = null
    window.isMicActive = null
    window.keysAllowed = true

    function clickButton (str) {
        console.log(str)
        isMicActive = !isMicActive
        button.click()
        console.log(`end ${str}`)
    }

    function initialize(e) {
        console.log('initialize')
        // already initialized or not the correct key.
        if (button || e.code !== keyCode) return

        if ((button = document.querySelector(activateLabel)) !== null) {
            isMicActive = false
        } else if ((button = document.querySelector(deactivateLabel)) !== null) {
            isMicActive = true
            clickButton('init')
        } else {
            console.error("Impossible to find button")
            document.removeEventListener('keyup', initialize)
            return
        }

        document.removeEventListener('keyup', initialize)
        document.addEventListener('keydown', (e) => {
            if (e.code === keyCode && !isMicActive && keysAllowed) {
                e.preventDefault()
                e.stopPropagation()
                clickButton('keydown')
            }
        }, null)
        document.addEventListener('keyup', (e) => {
            if (e.code === keyCode && isMicActive && keysAllowed) {
                e.preventDefault()
                e.stopPropagation()
                keysAllowed = false
                setTimeout(() => {
                    clickButton('keyup')
                    keysAllowed = true
                }, 500)
            }
        }, null)
    }

    document.addEventListener('keyup', initialize);
})();