@evan I read that section and implemented the preferred version, not the Mastodon one. That did not work, but I might got confused by other mistakes I made. Will give it another try. Thanks for your help!

@silverpill

[...] use a dedicated url (i.e. mine with an appended ./key) and just return an object of type "PublicKey"?

@evan @silverpill

@evan Thanks for your response. @silverpill already mentioned the "main-key" fragment. Is that documented somewhere?

I had an implementation that returned just an object of type "PublicKey" if the "./key" endpoint is called.

I checked what I get back from Mastodon if I call my profile with the "main-key" fragment. The result is the full profile.

So should I either refer to the profile url with the fragment and return the full "Person" OR [...]

[...] I checked out the Mastodon source code and searched for the error message. My Ruby-skills are limited, but it looks like Mastodon expects the type "Account".

I dont't understand what Mastodon expects from me. Any hint would be highly appreciated.

In the meanwhile I'll give https://activitypub.academy/ ad try ...

@silverpill @evan

#activitypub follow-up question: Thanks to @silverpill I made progress with my "Follow" request sent to Mastodon. After fixing a few more issues my current error message from Mastodon is:

"Could not refresh public key https://pub.saar.social/user/achim/key"

This URL returns my full profile having type "Person", which also contains the public key. The type "Person" is also used in the AP book by @evan which I use as a reference.

[...]

@silverpill Thanks for the hint. This was part of the problem. So I made progress and am now fixing the other things I messed up.

@silverpill Thanks! Mitra looks very interesting. I'll have a look and will probably pop up in your Matrix channel. I was not aware that there is a maintained ActivityPub project in Rust.

@mariusor That looks great! Thanks for the hint, I'll have a closer look.

[...]

{
"@context":["https://www.w3.org/ns/activitystreams","https://w3id.org/security/v1"],
"id":"https://pub.saar.social/user/achim/key",
"type":"Key",
"publicKeyPem":"-----BEGIN PUBLIC KEY-----\nMIIBI[...]IDAQAB\n-----END PUBLIC KEY-----\n",
"owner":"https://pub.saar.social/user/achim"
}

But my follow http call gets this back from Mastodon:

{"error":"Unable to fetch key JSON at https://pub.saar.social/user/achim/key"}

Can somebody give me a hint how to figure out what the problem is?

I try to implement an #activitypub server in #Rust, have problems talking to #mastodon and would appreciate some help.

I try to send a follow action to Mastodon. The request is - as far as I can tell - signed according to https://docs.joinmastodon.org/spec/security/

The "keyId" of the signatrue is "https://pub.saar.social/user/achim/key". Mastodon calls this url as expected and my server returns: [...]