If I wanted to mess around with ActivityPub c2s clients what's a server I can host that has support for it?

[tom@tomkahe.com]

If I wanted to mess around with ActivityPub c2s clients what's a server I can host that has support for it?

[mariusor@metalhead.club]

@tom check if this one I wrote can be of use:

https://github.com/mariusor/oni

PS: Any feedback about setting it up and configuring it for your use case will be appreciated, either here, or on github/mailing list.

[tom@tomkahe.com]

@mariusor thanks! (Looks like I had already starred this one awhile ago haha) I'll check it out and see if it's what I'm looking for

[mariusor@metalhead.club]

@tom if it doesn't work out I'd also be interested in learning why not. :D

[thisismissem@hachyderm.io]

@tom I'm slowly working on one, but it's completely unpaid work.

[tom@tomkahe.com]

@mariusor I got it running w/o many issues (maybe I missed it but I didn't see any wiki pages on building Box? I got that working as well regardless)

Is there an active issue w/ fetching oni content in Mastodon? I can't seem to grab my user or any statuses from my server or from activitypub.academy. I also tried fetching your posts (because it sounded like it at least worked last year, https://metalhead.club/@mariusor/113708953874760675) but that didn't work either so maybe I'm missing something.

[tom@tomkahe.com]

@thisismissem is that related to the stuff you were doing w/ PDSes a few weeks ago or are those separate projects?

[julian@community.nodebb.org]

mariusor@metalhead.club is there a public instance available?

[box464@mastodon.social]

@tom I see others are pointing you in a similar direction, but funnily enough I tinkered with Social Web's ap-component test instance this afternoon!

Look at the sample client "acct-handler", too. That's what I tried today.

https://socialwebfoundation.org/2025/05/28/ap-components/

https://github.com/social-web-foundation/acct-handler

[thisismissem@hachyderm.io]

@tom yeah, activitypds is the research project name, but there's a bunch of upstream work in Fedify to enable C2S in Fedify, and then also to enable reusing the Fedify vocabularies (they take JSON-LD and convert into classes that Fedify understands, and handles serialisation to JSON-LD)

[thisismissem@hachyderm.io]

@tom basically the things I'm trying to solve in ActivityPDS are:
- an OAuth profile (based on AT Proto's OAuth profile)
- webfinger & DIDs & Handles
- what should a "PDS" do in the context of ActivityPub C2S, how much logic does it implement, or is it just a simple pipe?

[evan@cosocial.ca]

@tom https://github.com/evanp/onepage.pub/

[tom@tomkahe.com]

@evan oh yeah this should be perfect

[evan@cosocial.ca]

@tom I can also send you an invite code.

There's a chapter on the social API in the ActivityPub book.

https://evanp.me/activitypub-book/

[evan@cosocial.ca]

@box464 @tom awesome! Make sure to add issues or PRs as you come up with ideas.

[tom@tomkahe.com]

@evan I signed up to get notified for the print edition a few months ago, still prefer actually holding physical books haha

[evan@cosocial.ca]

@tom OK!

[mariusor@metalhead.club]

@tom I basically follow actors and that's how seeing posts by others in your /inbox works.

The frontend loads stuff directly through JavaScript fetch and needs all the mechanisms of that to work (and I imagine what you see might be things failing to load due to CORS rules being too restrictive on remote Mastodon instances)

I am not aware of any issues with receiving activities though, and in this process the objects themselves should be fully dereferenced to local copies.

I'll add a note about BOX compilation. Thanx.

[mariusor@metalhead.club]

@tom looking at the post of mine you linked, I realize you're probably thinking of regular object discovery, and there isn't any mechanism for it yet, or for viewing remote objects that haven't reached your inbox.

[mariusor@metalhead.club]

@julian yes, two of them:

https://rattlehead.bruta.link < where a bot posts daily metal releases scraped from the internet

https://marius.federated.id < where I write a bit about stuff and play with more expressive ActivityPub objects.