How to disable some functions in Matomo.js

Support & Bugs
1

Hello, is there any correct way to disable two functions that are located in Matomo.js file (in order to prevent them being called from front-end)

The functions:

https://i.imgur.com/ojMr9Jc.png
https://i.imgur.com/ojMr9Jc.png917Ă—490 27.4 KB

These functions allow a front-end user to modify the cookie expiration value.
I want to prevent this, so I need to disable the functions in that file.

Can you help me, please?

2

Hi,

The easiest way is probably to write a plugin that adds JS to the tracker that overwrites those functions with ones that do nothing.

https://developer.matomo.org/guides/enrich-js-tracker

Keep in mind that doing so does change pretty little* as obviously users can change the cookie expiration by simply editing the cookie.

* the only thing I can think of that this prevents is that a frontend developer can’t accidentally call these functions thinking they do something else.

3

But I don’t see how to override those functions, they are part of matomo class so I can’t acess them

4

You might be able to do something like

window.Matomo.getAsyncTracker().setVisitorCookieTimeout = function(){}

but I can’t promise it will work reliably.

5

Hello, sadly that way to disable the function didn’t work, but we could achieve something similar by using the plugin https://plugins.matomo.org/JsTrackerCustom and writing this into it:
_paq.push([“setVisitorCookieTimeout”, “15552000”]);

Seems that this override any call to the function from outside matomo.js so we are safe like this.

Thanks for your support

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