We have certain action links which are one time use only. Some of them do not require any action from a user other than viewing it. And here comes the problem, when you share it in say Viber, Slack or anything else that generates a preview of the link (or unfurls the link as Slack calls it) it gets counted as used since it was requested. Is there a reliable way to detect these preview generating requests solely via PHP? And if it's possible, how does one do that?
2 Answers
I've looked on the entire internet to solve this problem. And I've found some workarounds to verify if the request is for link preview generation.
Then, I've created a tool to solve it. It's on GitHub: https://github.com/brunoinds/link-preview-detector
You only need to call a single method from the class:
<?php
require('path\to\LinkPreviewOrigin.php');
$response = LinkPreviewOrigin::isForLinkPreview();
//true or false
I hope to solve your question!
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