XF 2.2 Whitelisting external download URLs?


Hello everyone.
I am interested in whitelisting only allowed types of external resource URLs from an administration set list.
Example: A member would like to upload a class / course using an external link

Matching the beginning of the link might be the best route? Similar to email whitelisting add-ons.
I could probably achieve this with a custom-developed plugin, however if it's possible to setup on my own, I would appreciate the guidance!


I've found a developer willing to aide in the development of this resource.
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