1 files changed, 31 insertions, 235 deletions

diff --git a/app/assets/javascripts/tracking/index.js b/app/assets/javascripts/tracking/index.js
index 3714cac3fba..5417e2d969b 100644
--- a/app/assets/javascripts/tracking/index.js
+++ b/app/assets/javascripts/tracking/index.js
@@ -1,239 +1,20 @@
-import { omitBy, isUndefined } from 'lodash';
-import { TRACKING_CONTEXT_SCHEMA } from '~/experimentation/constants';
-import { getExperimentData } from '~/experimentation/utils';
+import { DEFAULT_SNOWPLOW_OPTIONS } from './constants';
 import getStandardContext from './get_standard_context';
+import Tracking from './tracking';
 
-const DEFAULT_SNOWPLOW_OPTIONS = {
-  namespace: 'gl',
-  hostname: window.location.hostname,
-  cookieDomain: window.location.hostname,
-  appId: '',
-  userFingerprint: false,
-  respectDoNotTrack: true,
-  forceSecureTracker: true,
-  eventMethod: 'post',
-  contexts: { webPage: true, performanceTiming: true },
-  formTracking: false,
-  linkClickTracking: false,
-  pageUnloadTimer: 10,
-  formTrackingConfig: {
-    forms: { allow: [] },
-    fields: { allow: [] },
-  },
-};
-
-const addExperimentContext = (opts) => {
-  const { experiment, ...options } = opts;
-  if (experiment) {
-    const data = getExperimentData(experiment);
-    if (data) {
-      const context = { schema: TRACKING_CONTEXT_SCHEMA, data };
-      return { ...options, context };
-    }
-  }
-  return options;
-};
-
-const renameKey = (o, oldKey, newKey) => {
-  const ret = {};
-  delete Object.assign(ret, o, { [newKey]: o[oldKey] })[oldKey];
-  return ret;
-};
-
-const createEventPayload = (el, { suffix = '' } = {}) => {
-  const {
-    trackAction,
-    trackEvent,
-    trackValue,
-    trackExtra,
-    trackExperiment,
-    trackContext,
-    trackLabel,
-    trackProperty,
-  } = el?.dataset || {};
-
-  const action = (trackAction || trackEvent) + (suffix || '');
-  let value = trackValue || el.value || undefined;
-  if (el.type === 'checkbox' && !el.checked) value = 0;
-
-  let extra = trackExtra;
-
-  if (extra !== undefined) {
-    try {
-      extra = JSON.parse(extra);
-    } catch (e) {
-      extra = undefined;
-    }
-  }
-
-  const context = addExperimentContext({
-    experiment: trackExperiment,
-    context: trackContext,
-  });
-
-  const data = {
-    label: trackLabel,
-    property: trackProperty,
-    value,
-    extra,
-    ...context,
-  };
-
-  return {
-    action,
-    data: omitBy(data, isUndefined),
-  };
-};
-
-const eventHandler = (e, func, opts = {}) => {
-  const el = e.target.closest('[data-track-event], [data-track-action]');
-
-  if (!el) return;
-
-  const { action, data } = createEventPayload(el, opts);
-  func(opts.category, action, data);
-};
-
-const eventHandlers = (category, func) => {
-  const handler = (opts) => (e) => eventHandler(e, func, { ...{ category }, ...opts });
-  const handlers = [];
-  handlers.push({ name: 'click', func: handler() });
-  handlers.push({ name: 'show.bs.dropdown', func: handler({ suffix: '_show' }) });
-  handlers.push({ name: 'hide.bs.dropdown', func: handler({ suffix: '_hide' }) });
-  return handlers;
-};
-
-const dispatchEvent = (category = document.body.dataset.page, action = 'generic', data = {}) => {
-  // eslint-disable-next-line @gitlab/require-i18n-strings
-  if (!category) throw new Error('Tracking: no category provided for tracking.');
-
-  const { label, property, value, extra = {} } = data;
-
-  const standardContext = getStandardContext({ extra });
-  const contexts = [standardContext];
-
-  if (data.context) {
-    contexts.push(data.context);
-  }
-
-  return window.snowplow('trackStructEvent', category, action, label, property, value, contexts);
-};
-
-export default class Tracking {
-  static queuedEvents = [];
-  static initialized = false;
-
-  static trackable() {
-    return !['1', 'yes'].includes(
-      window.doNotTrack || navigator.doNotTrack || navigator.msDoNotTrack,
-    );
-  }
-
-  static flushPendingEvents() {
-    this.initialized = true;
-
-    while (this.queuedEvents.length) {
-      dispatchEvent(...this.queuedEvents.shift());
-    }
-  }
-
-  static enabled() {
-    return typeof window.snowplow === 'function' && this.trackable();
-  }
-
-  static event(...eventData) {
-    if (!this.enabled()) return false;
-
-    if (!this.initialized) {
-      this.queuedEvents.push(eventData);
-      return false;
-    }
-
-    return dispatchEvent(...eventData);
-  }
-
-  static bindDocument(category = document.body.dataset.page, parent = document) {
-    if (!this.enabled() || parent.trackingBound) return [];
-
-    // eslint-disable-next-line no-param-reassign
-    parent.trackingBound = true;
-
-    const handlers = eventHandlers(category, (...args) => this.event(...args));
-    handlers.forEach((event) => parent.addEventListener(event.name, event.func));
-    return handlers;
-  }
-
-  static trackLoadEvents(category = document.body.dataset.page, parent = document) {
-    if (!this.enabled()) return [];
-
-    const loadEvents = parent.querySelectorAll(
-      '[data-track-action="render"], [data-track-event="render"]',
-    );
-
-    loadEvents.forEach((element) => {
-      const { action, data } = createEventPayload(element);
-      this.event(category, action, data);
-    });
-
-    return loadEvents;
-  }
-
-  static enableFormTracking(config, contexts = []) {
-    if (!this.enabled()) return;
-
-    if (!Array.isArray(config?.forms?.allow) && !Array.isArray(config?.fields?.allow)) {
-      // eslint-disable-next-line @gitlab/require-i18n-strings
-      throw new Error('Unable to enable form event tracking without allow rules.');
-    }
-
-    // Ignore default/standard schema
-    const standardContext = getStandardContext();
-    const userProvidedContexts = contexts.filter(
-      (context) => context.schema !== standardContext.schema,
-    );
-
-    const mappedConfig = {};
-    if (config.forms) mappedConfig.forms = renameKey(config.forms, 'allow', 'whitelist');
-    if (config.fields) mappedConfig.fields = renameKey(config.fields, 'allow', 'whitelist');
-
-    const enabler = () => window.snowplow('enableFormTracking', mappedConfig, userProvidedContexts);
-
-    if (document.readyState === 'complete') enabler();
-    else {
-      document.addEventListener('readystatechange', () => {
-        if (document.readyState === 'complete') enabler();
-      });
-    }
-  }
-
-  static mixin(opts = {}) {
-    return {
-      computed: {
-        trackingCategory() {
-          const localCategory = this.tracking ? this.tracking.category : null;
-          return localCategory || opts.category;
-        },
-        trackingOptions() {
-          const options = addExperimentContext(opts);
-          return { ...options, ...this.tracking };
-        },
-      },
-      methods: {
-        track(action, data = {}) {
-          const category = data.category || this.trackingCategory;
-          const options = {
-            ...this.trackingOptions,
-            ...data,
-          };
-          Tracking.event(category, action, options);
-        },
-      },
-    };
-  }
-}
+export { Tracking as default };
 
+/**
+ * Tracker initialization as defined in:
+ * https://docs.snowplowanalytics.com/docs/collecting-data/collecting-from-own-applications/javascript-trackers/javascript-tracker/javascript-tracker-v2/tracker-setup/initializing-a-tracker-2/.
+ * It also dispatches any event emitted before its execution.
+ *
+ * @returns {undefined}
+ */
 export function initUserTracking() {
-  if (!Tracking.enabled()) return;
+  if (!Tracking.enabled()) {
+    return;
+  }
 
   const opts = { ...DEFAULT_SNOWPLOW_OPTIONS, ...window.snowplowOptions };
   window.snowplow('newTracker', opts.namespace, opts.hostname, opts);
@@ -242,8 +23,18 @@ export function initUserTracking() {
   Tracking.flushPendingEvents();
 }
 
+/**
+ * Enables tracking of built-in events: page views, page pings.
+ * Optionally enables form and link tracking (automatically).
+ * Attaches event handlers for data-attributes powered events, and
+ * load-events (on render).
+ *
+ * @returns {undefined}
+ */
 export function initDefaultTrackers() {
-  if (!Tracking.enabled()) return;
+  if (!Tracking.enabled()) {
+    return;
+  }
 
   const opts = { ...DEFAULT_SNOWPLOW_OPTIONS, ...window.snowplowOptions };
 
@@ -252,8 +43,13 @@ export function initDefaultTrackers() {
   const standardContext = getStandardContext();
   window.snowplow('trackPageView', null, [standardContext]);
 
-  if (window.snowplowOptions.formTracking) Tracking.enableFormTracking(opts.formTrackingConfig);
-  if (window.snowplowOptions.linkClickTracking) window.snowplow('enableLinkClickTracking');
+  if (window.snowplowOptions.formTracking) {
+    Tracking.enableFormTracking(opts.formTrackingConfig);
+  }
+
+  if (window.snowplowOptions.linkClickTracking) {
+    window.snowplow('enableLinkClickTracking');
+  }
 
   Tracking.bindDocument();
   Tracking.trackLoadEvents();