# all files / src/gatherers/ service-worker.js

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     /**
     * @license
     * Copyright 2016 Google Inc. All rights reserved.
     *
     * Licensed under the Apache License, Version 2.0 (the "License");
     * you may not use this file except in compliance with the License.
     * You may obtain a copy of the License at
     *
     *     http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing, software
     * distributed under the License is distributed on an "AS IS" BASIS,
     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     * See the License for the specific language governing permissions and
     * limitations under the License.
     */
    'use strict';

    const Gather = require('./gather');

    class ServiceWorker extends Gather {
      get name() {
        return 'serviceWorkers';
      }

      reloadSetup(options) {
        const driver = options.driver;
        this.resolved = false;

        this.artifactsResolved = new Promise((res, _) => {
          driver.on('ServiceWorker.workerVersionUpdated', data => {
            if (!this.resolved) {
              const controlledClients =
                  ServiceWorker.getActivatedServiceWorker(data.versions, options.url);

              this.artifact = {
                versions: controlledClients ? [controlledClients] : []
              };
              this.resolved = (typeof this.artifact.versions !== 'undefined');
              res();
            }
          });
        });
      }

      static getOrigin(url) {
        const parsedURL = require('url').parse(url);
        return `${parsedURL.protocol}//${parsedURL.hostname}`;
      }

      static getActivatedServiceWorker(versions, url) {
        const origin = this.getOrigin(url);
        return versions.find(v => v.status === 'activated' && v.scriptURL.startsWith(origin));
      }

      beforeReloadPageLoad(options) {
        const driver = options.driver;
        driver.sendCommand('ServiceWorker.enable');

        return this.artifactsResolved;
      }
    }

    module.exports = ServiceWorker;