StubAttribution.init = function()

in media/js/base/stub-attribution/stub-attribution.js [628:679]
33 lines of code
10 McCabe index (conditional complexity)

    StubAttribution.init = function (successCallback, timeoutCallback) {
        var data = {};

        if (!StubAttribution.meetsRequirements()) {
            return;
        }

        // Support custom callback functions for success and timeout.
        if (typeof successCallback === 'function') {
            StubAttribution.successCallback = successCallback;
        }

        if (typeof timeoutCallback === 'function') {
            StubAttribution.timeoutCallback = timeoutCallback;
        }

        /**
         * If cookie already exists, update download links on the page,
         * else make a request to the service if within attribution rate.
         */
        if (StubAttribution.hasCookie()) {
            data = StubAttribution.getCookie();
            StubAttribution.updateBouncerLinks(data);

            // As long as the user is not already on the automatic download page,
            // make the XHR request to the stub authentication service.
        } else if (!StubAttribution.isFirefoxDownloadThanks()) {
            // Wait for GA4 to load and return client IDs
            StubAttribution.waitForGoogleAnalyticsThen(function () {
                // get attribution data
                data = StubAttribution.getAttributionData();

                if (
                    data &&
                    StubAttribution.withinAttributionRate() &&
                    StubAttribution.hasValidData(data)
                ) {
                    // if data is valid and we are in sample rate:
                    // request authentication from stub attribution service
                    StubAttribution.requestAuthentication(data);

                    // Send the session ID to GA4
                    if (data.client_id_ga4) {
                        window.dataLayer.push({
                            event: 'stub_session_set',
                            id: data.session_id
                        });
                    }
                }
            });
        }
    };