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How to Set Up ActivityPub for Self-Hosted WordPress Sites
(jseggers.com)
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this post was submitted on 03 Jan 2024
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I've been largely disappointed with my attempts to use ActivityPub with Wordpress. I do revisit it every now and then.
That's not true. Reading the ActivityPub outbox is the way to do that. Mastodon doesn't and I'm not entirely sure why (though I could probably find out).
I have also had poor results trying to use the Friends plugin with ActivityPub. Incoming replies result in high CPU usage for many seconds, and outgoing replies didn't show up last time I tried it.
I agree, that the implementation has its issues, but it's a start. Version 2.0 is supposed to drop in a week or two, which brings some needed enhancements. I didn't realize that the lack of post history was Mastodon-specific. However, when I try to view my blog through different sources I have the same issue, so maybe that's a standard practice?
I'm not sure if any projects actually do automatic backfill, but they could and there does seem to be a desire to implement it.
This is your ActivityPub outbox (as JSON). The part it doesn't seem to handle nicely is pasting an object ID/post URL into some other fediverse software to fetch the post manually, which is how someone would interact with an old post from a new follow on Mastodon.
I want to enable comments via ActivityPub (and only via ActivityPub) for a site I use Wordpress on, but I'm not sure I'm sufficiently motivated to try to debug the Friends plugin myself.
Yes, that would be nice, although I'm not sure how implementation would work. You need something to anchor the toots to the post. The logical choice is the URL of the post. However, this can be accomplished already with webmention and doesn't need ActivityPub at all. You have to use something like Bridgy to monitor your account for your domain and then pass them to webmention. Unfortunately, Bridgy can be a little finicky.
I used to use a WordPress plugin that allowed people to post comments using their social media accounts, but that was just for verification and it wasn't an integration with social media.
The ideal technical implementation is that when a client requests the post with an accept header of
application/ld+json; profile="https://www.w3.org/ns/activitystreams", Wordpress sends the ActivityPub version of the post instead of HTML. It should have the same content as the items in the outbox. There may be limitations in the Wordpress plugin API that prevent this.Another implementation allowed by the standard would be to have a different URL for the ActivityPub ID and put the post's URL in the object's URL property, or insert it in the content. Perhaps version 2 of the plugin will handle this better.