Ignore AI assistant campaign attribution in tracker

Author: tzi

js/piwik.js

@@ -2799,6 +2799,28 @@ if (typeof window.Matomo !== 'object') {
                 return false;
             }
 
+            /**
+             * Returns if the current landing URL contains campaign-style parameters that should be treated as AI assistant sources.
+             * This covers cases where AI assistants append values like utm_source=chatgpt.com without sending a document referrer.
+             *
+             * @param currentUrl
+             * @returns {boolean}
+             */
+            function shouldIgnoreCampaignForCurrentUrl(currentUrl) {
+                var i,
+                    campaignParameterValue;
+
+                for (i = 0; i < configCampaignNameParameters.length; i++) {
+                    campaignParameterValue = getUrlParameter(currentUrl, configCampaignNameParameters[i]);
+
+                    if (campaignParameterValue.length && shouldIgnoreCampaignForReferrer(campaignParameterValue)) {
+                        return true;
+                    }
+                }
+
+                return false;
+            }
+
             /*
              * Removes hash tag from the URL
              * Removes ignore_referrer/ignore_referer
@@ -3968,7 +3990,8 @@ if (typeof window.Matomo !== 'object') {
                     if ((!configConversionAttributionFirstReferrer
                         || !campaignNameDetected.length)
                         && (configEnableCampaignParameters || configConsentRequired)
-                        && !shouldIgnoreCampaignForReferrer(configReferrerUrl)) {
+                        && !shouldIgnoreCampaignForReferrer(configReferrerUrl)
+                        && !shouldIgnoreCampaignForCurrentUrl(currentUrl)) {
                           for (i in configCampaignNameParameters) {
                               if (Object.prototype.hasOwnProperty.call(configCampaignNameParameters, i)) {
                                   campaignNameDetected = getUrlParameter(currentUrl, configCampaignNameParameters[i]);

tests/javascript/index.php

@@ -3769,7 +3769,7 @@ function generateAnIframeInDocument() {
     });
 
     test("tracking", function() {
-        expect(189);
+        expect(192);
 
         // Prevent Opera and HtmlUnit from performing the default action (i.e., load the href URL)
         var stopEvent = function (evt) {
@@ -4283,6 +4283,15 @@ function generateAnIframeInDocument() {
         equal(attributionInfos[1], ['']);
         equal(attributionInfos[3], ['https://chatgpt.com/c/683cd223-11f8-8r0c-a463-9b0606688162']);
 
+        icTracker.deleteCookies();
+        icTracker.setReferrerUrl('');
+        icTracker.setCustomUrl('https://matomo.org/blog/?utm_source=chatgpt.com');
+        icTracker.trackPageView('ignoreCampaignNoReferrer');
+        attributionInfos = icTracker.getAttributionInfo();
+        equal(attributionInfos[0], ['']);
+        equal(attributionInfos[1], ['']);
+        equal(attributionInfos[3], ['']);
+
         // delete existing onerror handler and setup tracking again
         window.onerror = customOnErrorInvoked = false;
         tracker2.enableJSErrorTracking();