Implement consent mode v0

README.md

@@ -35,3 +35,26 @@ Alternatively, run `npm run lint:php:diff` to run coding standards checks agains
 ## Docs
 
 - [Hooks defined or used in Google Analytics for WooCommerce](./docs/Hooks.md)
+
+### Consent Mode
+
+The extension sets up [the default state of consent mode](https://developers.google.com/tag-platform/security/guides/consent?hl=en&consentmode=advanced#default-consent), denying all parameters for the EEA region. You can append or overwrite that configuration using the following snippet:
+
+```php
+add_action( 'wp_enqueue_scripts', function () {
+    $customConsentConfig = "
+        gtag( 'consent', 'default', {
+            analytics_storage: 'granted',
+            ad_storage: 'granted',
+            ad_user_data: 'denied',
+            ad_personalization: 'denied',
+            region: 'ES',
+        } );";
+
+    wp_register_script( 'my-custom-consent-mode', '', array('woocommerce-google-analytics-integration'), null, false );
+    wp_add_inline_script( 'my-custom-consent-mode', $customConsentConfig );
+    wp_enqueue_script( 'my-custom-consent-mode' );
+} );
+```
+
+After the page loads, the consent for particular parameters can be updated by other plugins or custom code, implementing UI for customer-facing configuration using [Google's consent API](https://developers.google.com/tag-platform/security/guides/consent?hl=en&consentmode=advanced#update-consent) (`gtag('consent', 'update', {…})`).

assets/js/src/config.js

@@ -1,2 +1,36 @@
 /* global wcgai */
 export const config = wcgai.config;
+export const EEARegions = [
+	'AT',
+	'BE',
+	'BG',
+	'HR',
+	'CY',
+	'CZ',
+	'DK',
+	'EE',
+	'FI',
+	'FR',
+	'DE',
+	'GR',
+	'HU',
+	'IS',
+	'IE',
+	'IT',
+	'LV',
+	'LI',
+	'LT',
+	'LU',
+	'MT',
+	'NL',
+	'NO',
+	'PL',
+	'PT',
+	'RO',
+	'SK',
+	'SI',
+	'ES',
+	'SE',
+	'GB',
+	'CH',
+];

assets/js/src/tracker/index.js

@@ -1,4 +1,4 @@
-import { config } from '../config';
+import { config, EEARegions } from '../config';
 import * as formatters from './data-formatting';
 
 let instance;
@@ -39,6 +39,15 @@ class Tracker {
 
 		window[ config.tracker_function_name ] = gtag;
 
+		// Set up default consent state, denying all for EEA visitors.
+		gtag( 'consent', 'default', {
+			analytics_storage: 'denied',
+			ad_storage: 'denied',
+			ad_user_data: 'denied',
+			ad_personalization: 'denied',
+			region: EEARegions,
+		} );
+
 		gtag( 'js', new Date() );
 		gtag( 'set', `developer_id.${ config.developer_id }`, true );
 		gtag( 'config', config.gtag_id, {