Validate Custom User Field for Fediverse Handle

Support
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Yes, I have searched and found one general method for validating the input to a custom user field. My skills here are a bit raw, so hoping for suggestions.

We’ve been encouraging people in our education community to include in their profile a username if they have a fediverse account (Mastodon, Bluesky, Threads, et al). These should be something with two @ signs, where the first is a username and the second a valid formatted domain.

 @coolperson99@someinstance.org

Despite what I thought was a clearly explained format:

Fediverse User Name: Enter identity in a federated social network such as Mastodon, BlueSky, Threads, etc. Entries must in format @username@instance.name please only enter valid account names!
Fediverse User Name: Enter identity in a federated social network such as Mastodon, BlueSky, Threads, etc. Entries must in format @username@instance.name please only enter valid account names!1096×326 43.9 KB

The successful entry rate is like 20% or worse. I get email addresses, twitter usernames, random strings, URLs. I can only dream, but think it should be possible to check with some regex (again my skills are mid range to muddling) for the valid format.

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This plugin maybe of interest if you’re self hosted or on a Hosted plan that includes it

This theme-component maybe also of interest as well. This of course can be installed on any discourse install.

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Thanks Dan, the Discourse Authentication Validations plugin looks perfect and useful for my other fields.

I am already using Clickable Social Icon Links. I can see my mistake was asking for a mastodon username rather than a URL, so it looks like I have some cleanup to do!

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You’re quite welcome!

Just found this theme-component that you might also find very useful.

You could create a post with fields that need correcting with providing format details/pic.

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