feat(consent): track consent banner close events

[ekremney]

Changes

Instead of reading cookies directly, now we use the OneTrust Banner SDK to catch the OneTrust events.

Motivation

We currently don't track the "banner closed" (if) happens after "banner shown". This is especially important to calculate the bounces caused by the cookie consent banner robustly.

this PR introduces a new target close to the consent checkpoint.

Note: if we decide to go with this impl, I will adjust the tests.

Here's an alternative implementation for the close event keeping everything else the same: #374

[adobe-bot]

This PR will trigger a minor release when merged.

[aem-code-sync]

Hello, I'm the AEM Code Sync Bot and I will run some actions to deploy your branch and validate page speed.
In case there are problems, just click a checkbox below to rerun the respective action.

• Re-run PSI checks
• Re-sync branch

Commits

• f17698c ✅ (latest)
• 74b9322 ✅
• 10c3596 ✅

[ramboz]

Do you need this exposed on the object? we could just use a local variable, no?

[ekremney]

I am not sure, would a local variable cut it? what happens if addCookieConsentTracking(sampleRUM) called twice?

[ramboz]

There should be only 1 sampleRUM instance… so it would be the same problem.
You could bail out with a conditional if it is called a 2nd time

[chicharr]

Hi @ekremney
couple of comments:

1. with this new approach if a visitor who already closed the the banner before in a previous visit, leaves the page before OneTrust is loaded, we will not track the hidden checkpoint.
2. A cosmetic issue. We are defining an object window.OneTrust in sites where OneTrust is not installed, right?

[ekremney]

@chicharr

1. we keep that functionality, the IsAlertBoxClosed checks the cookie underneath: https://developer.onetrust.com/onetrust/docs/javascript-api#is-optanonalertboxclosed-cookie-set

if (oneTrust.IsAlertBoxClosed()) {
  sampleRUM('consent', { source: 'onetrust', target: 'hidden' });
}

2. window.OneTrust will return undefined until someone explicitly sets a value via window.OneTrust = ...