index.js

  var CREATE_URL = MEETINGS_BASE + '/meetings/create/?';
  var BUTTON_TEMPLATE = '<a href="{{0}}" target="_blank" id="meetings-button"><img style="vertical-align: bottom" src="' + chrome.extension.getURL('images/button{{1}}.png') + '"></a>';
  var INTEGRATION_NAMES = {
      "*://www.linkedin.com/profile/view*": "gmail",
      "*://www.google.com/calendar/*": "google-calendar",
      "*://www.linkedin.com/profile/view*": "linkedin",
      "*://*.com/owa/*":"outlook",
      "*://www.facebook.com/messages/*":"facebook",
      "*://*.salesforce.com/*":"salesforce",
      "*://*.highrisehq.com/people/*":"highrise"
  };

  function fill(string, args) {
    return string.replace(/\{\{([^\}]+)\}\}/g, function (match, key) {
      return args[key] === undefined ? '' : args[key];
    });
  }

  function parametrize(params) {
    var r = [];
    for (var key in params) {
      if (params[key]) {
        r.push(key + '=' + encodeURIComponent(params[key]));
      }
    }
    return r.join('&');
  }

  (function (callback) {
      chrome.runtime.sendMessage({method: "getDisabled"}, function(response) {
          for (var pattern in INTEGRATIONS) {
              //console.log(disabled, pattern, INTEGRATION_NAMES[pattern]);
              if(!response.disabled[INTEGRATION_NAMES[pattern]]) {
                  if (new RegExp(pattern.replace(/\*/g, "[^ ]*")).exec(document.location.toString())) {
                      return INTEGRATIONS[pattern](callback);
                  }
              }
          }
      });
  })(function (r) {

    var participants = r.contacts.map(function (contact) {
      return fill('"{{0}}" <{{1}}>', [contact.name, contact.email]);
    }).join(', ');

    var params = {
      title:r.title,
      location:r.location,
      begin_epoch:r.start ? Math.floor(r.start / 1000) : undefined,
      end_epoch:r.end ? Math.floor(r.end / 1000) : undefined,
      initial_participants:participants
    };

    if(!$('#meetings-button').length) {
      $(r.selector)[r.place || 'append']($(
        fill(BUTTON_TEMPLATE,
          [CREATE_URL + parametrize(params), r.button ? '-' + r.button : '']
        )).attr("style", r.style || ""));
    }

  });