discotheque/background.js at master · panjan/discotheque · GitHub

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'use strict';

var windowId = null;
var tabId = null;
var interval = null;
var errors = null;

chrome.tabs.onUpdated.addListener(function(id, changeInfo, tab) {
  if (tabId === null) return;
  if (id === tabId && changeInfo.status == 'complete') {
    chrome.tabs.sendMessage(tabId, { name: 'toggle-in-page-toolbar' });
  }
});

function toggleToolbar() {
  chrome.tabs.getSelected(windowId, (tab) => {
    tabId = tab.id;
  });
}

function respondsWith200(url) {
  try {
    var xmlHttp = new XMLHttpRequest();
    xmlHttp.open('GET', url, false);
    xmlHttp.send(null);
    return xmlHttp.status === 200 || xmlHttp.status === 204;
  } catch (e) {
    return false;
  }
}

function openWindow(targetAddress) {
  var createData = {
    url: targetAddress,
    focused: true,
    type: 'popup'
  };
  chrome.windows.create(
    createData,
    (window) => {
      windowId = window.id;
      toggleToolbar();
    });
}

function setNA(targetAddress) {
  chrome.browserAction.setBadgeText({ text: 'N/A' });
  chrome.browserAction.setBadgeBackgroundColor({ color: '#dd3f3a' });
  if (windowId === null) {
    openWindow(targetAddress);
  }
}

function setOK() {
  chrome.browserAction.setBadgeText({ text: 'OK' });
  chrome.browserAction.setBadgeBackgroundColor({ color: '#5cb85c' });
  if(windowId !== null) {
    chrome.windows.remove(windowId);
    windowId = null;
  }
}

function checkStatus(config) {
  var unavailableAddresses = [];
  for(var address of config.addresses) {
    if(!respondsWith200(address)) {
      unavailableAddresses.push(address);
    }
  }

  if(unavailableAddresses.length > 0) {
    errors = unavailableAddresses;
    setNA(config.targetAddress);
  }
  else {
    errors = null;
    setOK();
  }
}

function poll() {
  clearInterval(interval);
  chrome.storage.local.get({
    addresses: [],
    targetAddress: 'https://www.youtube.com/watch?v=wZZ7oFKsKzY',
    pollingInterval: 60
  },
                           (config) => {
                             if(config.addresses.length === 0) return;
                             checkStatus(config);
                             var intervalInSeconds = config.pollingInterval * 1000;
                             interval = setInterval(checkStatus, intervalInSeconds, config);
                           });
}

chrome.browserAction.onClicked.addListener(() => chrome.runtime.openOptionsPage());
chrome.runtime.onMessage.addListener(
  function(request, sender, sendResponse) {
    if (request.name == 'overlay-initialized'){
      console.log('UPDATE OVERLAY');
      setTimeout(() => {
        chrome.tabs.sendMessage(sender.tab.id, { name: 'overlay-errors', errors: errors });
      }, 1000);
    }
  });
poll();