https://cdn1.img.sputniknews.jp/js/sw/analytics.js

1'use strict';
2
3/* eslint-env browser, serviceworker */
4// Make use of Google Analytics Measurement Protocol.
5// https://developers.google.com/analytics/devguides/collection/protocol/v1/reference
6class Analytics {
7  trackEvent(eventCategory, eventAction) {
8    if (!this.trackingId) {
9      console.error('You need to set a trackingId, for example:');
10      console.error('self.analytics.trackingId = \'UA-XXXXXXXX-X\';');
11
12      // We want this to be a safe method, so avoid throwing Unless
13      // It's absolutely necessary.
14      return Promise.resolve();
15    }
16
17    if (!eventCategory && !eventAction) {
18      console.warn('sendAnalyticsEvent() called with no eventCategory or ' +
19      'eventAction.');
20      return Promise.resolve();
21    }
22
23    return self.registration.pushManager.getSubscription()
24    .then(subscription => {
25      if (subscription === null) {
26        // The user has not subscribed yet.
27        throw new Error('No subscription currently available.');
28      }
29
30      const payloadData = {
31        // Version Number
32        v: 1,
33        // Client ID
34        cid: subscription.endpoint,
35        // Tracking ID
36        tid: this.trackingId,
37        // Hit Type
38        t: 'event',
39        // Data Source
40        ds: 'serviceworker',
41        // Event Category
42        ec: eventCategory,
43        // Event Action
44        ea: eventAction,
45        ni: 1
46      };
47
48      const payloadString = Object.keys(payloadData)
49      .filter(analyticsKey => {
50        return payloadData[analyticsKey];
51      })
52      .map(analyticsKey => {
53        return `${analyticsKey}=` +
54          encodeURIComponent(payloadData[analyticsKey]);
55      })
56      .join('&');
57
58      return fetch('https://www.google-analytics.com/collect', {
59        method: 'post',
60        body: payloadString
61      });
62    })
63    .then(response => {
64      if (!response.ok) {
65        return response.text()
66        .then(responseText => {
67          throw new Error(
68            `Bad response from Google Analytics ` +
69            `[${response.status}] ${responseText}`);
70        });
71      }
72    })
73    .catch(err => {
74      console.warn('Unable to send the analytics event', err);
75    });
76  }
77}
78
79if (typeof self !== 'undefined') {
80  self.analytics = new Analytics();
81}