Your WordPress as Your Personal Mastodon Instance

tl;dr: Three plugins can transform your WordPress install to your personal Mastodon Instance: ActivityPub, Enable Mastodon Apps, and Friends.

As you might know, I am the author of the Friends plugin for WordPress. I started this in 2018 with the idea (which I later described in a vision post) that something like Facebook (with private posts) could be implemented decentralized between WordPresses (and later other blogs/cmses).

To be honest, the effort is and stays somewhat niche. Social networks are good at locking people in, discovery is better, and many of my friends don’t actually run their own blog.

Joining the Fediverse

A few years later, Mastodon became big, and having been in contact with Matthias Pfefferle, I realized (after he repeatedly poked me) that it’d be great to join forces with his ActivityPub plugin (later acquired by Automattic): it allows people on Mastodon and other ActivityPub networks to follow your WordPress blog directly, not utilizing the then common “Share to Twitter” et al functionality.

So, when you have both ActivityPub and Friends installed, you can be followed and follow people on Mastodon. The Friends plugin compiles a feed of your follows (mixed in or separately also with all your RSS subscriptions).

A screenshot of the Friends plugin home screen feed.
This shows my private Friends page where statuses and posts display mixed (you can also have pure views)

This was already nice, but Matthias and I both had to implement further elements to be truly integrated into Mastodon conversations: the ActivityPub plugin implemented replies with comments, Friends implemented Boosting and Replying to any (ActivityPub) URL, and much more.

Screenshot of the ActivityPub Admin Screen
The ActivityPub admin page shows your Mastodon Handle

A (Mobile) App Ecosystem

Still, there was one piece missing. Mastodon has a thriving third-party app ecosystem. The UI of Mastodon as well of Friends (while completely customizable), is not to everyone’s taste, but you have a huge selection of apps to match your taste.

So, in the very end of 2022, I started to work on the Enable Mastodon Apps plugin. It implements the same API that Mastodon implements for talking to its clients, just in WordPress.

A screenshot of Mastodon apps
Today the official directory lists 56 apps, likely many more exist

It was quite a wild ride (that likely is not over yet), reverse engineering some clients because they would crash even if the plugin spoke exactly what the docs defined. The reason being that most apps (understandably) assume some further truths that are valid for Mastodon’s implementation, like ids, while being defined to be of string value, actually need to be numbers. Eugen Rochko actually later confirmed to me that this specific choice was merely made to avoid troubles with very large ids.

Last week, I released 0.9.0 of Enable Mastodon Apps which is almost a rewrite, fueled by contributors at the CloudFest Hackathon: special thanks to Matthias Pfefferle for hosting it, Matthias Kittsteiner, Konstantin Obenland, and Ralf Wiechers for your contributions! This resulted in a more stable implementation (ensuring correct JSONs) and a stricter separation of concerns.

Combining the Power of Three Plugins

So the combination of the three plugins now gives you the ability to fully interact with the Fediverse while not having to host your own Mastodon which comes with quite a list of requirements.

Granted, there are still rough edges (please help discover and fixing them by reporting in the respective Github issues) and we yet only have experience with a couple hundred followers and follows. But that works already reliably.

Each of the plugins are useful on their own:

  • If you have just the ActivityPub plugin, people can follow your blog on the fediverse, can comment from the fediverse on your posts and your replies will go back into the fediverse.
  • If you have just the Enable Mastodon Apps plugin, you can use Mastodon Apps to see the posts on your blog (useful if it’s a multi-people blog), reply and submit new posts.
  • If you have just the Friends plugin, you can connect WordPresses, follow RSS feeds, get keyword notifications, apply feed rules, react on posts with emoji (there is a bit of an ecosystem of its own, with further plugins Post Collection and Send to E-Reader).

Together, by making use of WordPress hooks (see for example the Enable Mastodon Apps Hooks Documentation), the plugin extend each other’s API responses or UI. What travels over the the ActivityPub protocol is handled by the ActivityPub plugin. When a feed of posts is involved, the Friends plugin will fill in your friends’ posts. And so on.

Alternative UIs

It’s really quite something to be able to browse your own blog, or statuses and blogs you follow with apps like Phanpy (web), Elk (web), Mammoth (macOS, iPad, iOS), or Tusky (Android) or Ivory (macOS and iOS).

The posting experience from mobile using a Mastodon App can be better than with the standard WordPress mobile apps. Each app covers a different use case and has posting UI specialized in that.

Empower Your WordPress!

I believe that the Fediverse comes to the rescue of blogging. Unfortunately, years ago the comment sections of the web were killed by spam. The fediverse now reopens meaningful interaction with your blog posts. Comments from the Fediverse appear in your blog and your responses are sent back as replies. That gets conversations going again!

To try it out, you can use WordPress “run WordPress in your browser” Playground to take a little glimpse at the plugins without having to install it: Note that, because of its JS nature, playground is in a sandbox and can only connect to CORS enabled URLs.

Finally, these are the links to the WordPress plugin directory:

  • ActivityPub: have conversations about your blog posts across the fediverse.
  • Enable Mastodon Apps: make WordPress compatible with Mastodon apps.
  • Friends: follow others via RSS or ActivityPub.

Thanks for reading, I am curious for your opinions! You can reply to this post on the fediverse!

Mastodon API Tester

tldr: Use the Mastodon API Tester to play with the Client API of Mastodon.

I’ve created the WordPress plugin called Enable Mastodon Apps which does a seemingly small but powerful thing: it enables you to access your WordPress blog using Mastodon apps like Tusky or Ivory. This can be used to browse your own blog and post to it. If you also have the Friends plugin and the ActivityPub plugin installed, this will actually make your WordPress blog behave like a Mastodon instance.

It does this be re-implementing the Mastodon API (unfortunately, Mastodon didn’t opt to implement the ActivityPub client-server API so this is not based on a standard) which can be tricky: it uses REST API endpoints in the (virtual) directories /oauth and /api which are so generic that they are prone to conflicts.

Additionally, although the API is well documented, many apps were created based on assumptions that are true for Mastodon itself (which caused a lot–sometimes hard to reproduce–of issues for the plugin). For example, the id of a post or a user is defined as a string but many apps crash when you put a non-number there. Or that a boosted toot needs to have a different id than the virtual “wrapping” toot (Ivory!). In such cases, apps would crash but work fine with Mastodon itself.

Even more complicated are interactions with other WordPress plugins. It can be hard to understand if the plugin is working correctly, if another plugin is interfering, the hosting provider acts quirky, or if the Mastodon app has an incompatibilty with my implementation.

Thus I have created a simple one-page JS app called Mastodon API Tester hosted on Github pages (source on Github):

I hope that this tool will help identify issues better in future, it can also be used with GotoSocial or a “real” Mastodon instance. Feel free to report issues you might encounter.

PS: the Enable Mastodon Apps plugin will be worked on at the Cloudfest Hackathon, thanks Matthias Pfefferle for taking the lead on this! (Unfortunately, I cannot make it there because I’ll be speaking at WordCamp Asia in Taipei just the weekend before that.)

PPS: Happy Birthday, Matt!