https://yubanet.com/newspack-sw.js

1let requestCount = {};
2let nonceValue = '';
3let currentPage = '';
4let versionValue = false;
5
6self.addEventListener( 'message', function ( event ) {
7	if ( event.data === 'newspack-reset-request-count' ) {
8		requestCount = {};
9	}
10	if ( event.data.indexOf( 'newspack-nonce-' ) === 0 ) {
11		nonceValue = event.data.replace( 'newspack-nonce-', '' );
12	}
13	if ( event.data.indexOf( 'newspack-version-' ) === 0 ) {
14		versionValue = event.data.replace( 'newspack-version-', '' );
15	}
16} );
17
18const findProperty = payload => {
19	const found = payload.match( /tid=([\w-]*)/ );
20	if ( found ) {
21		return found[ 1 ];
22	}
23};
24
25const sendMessage = message =>
26	fetch(
27		`/wp-json/newspack-manager/v1/sw-message?message=${ encodeURIComponent(
28			`${ message } (URL: ${ currentPage })`
29		) }&nonce=${ nonceValue }&version=${ versionValue }`
30	);
31
32const handlePageViewForProperty = ( clientId, property ) => {
33	if ( ! requestCount[ clientId ] ) {
34		requestCount[ clientId ] = {};
35	}
36	requestCount[ clientId ][ property ] = requestCount[ clientId ][ property ] + 1 || 1;
37	if ( requestCount[ clientId ][ property ] > 1 ) {
38		sendMessage( `Property \`${ property }\` has sent more than two pageviews per request.` );
39	}
40};
41
42self.addEventListener( 'fetch', async event => {
43	const url = event.request.url;
44	if ( url.match( /google-analytics\.com.*\/collect/ ) ) {
45		if ( ! event.clientId ) {
46			return;
47		}
48		const client = await self.clients.get( event.clientId );
49		if ( ! client ) {
50			return;
51		}
52		currentPage = client.url;
53		const { search } = new URL( url );
54		let property = findProperty( search );
55		let params = search.replace( /^\?/, '' ).split( '&' );
56		const text = await event.request.text();
57		if ( ! property ) {
58			property = findProperty( text );
59		}
60		if ( property ) {
61			params = params.concat( text.split( '&' ) );
62			if (
63				// GA4
64				params.includes( 'en=page_view' ) ||
65				// UA
66				params.includes( 't=pageview' )
67			) {
68				handlePageViewForProperty( event.clientId, property );
69			}
70		}
71	}
72} );