WordPress and 844e

[julian@community.nodebb.org]

Hi pfefferle@mastodon.social, I was just curious why activitypub.blog@activitypub.blog was a user and not a group on NodeBB, so I checked out its AP representation on BrowserStack.

This stood out:

  ...
  "generator": {
    "type": "Application",
    "implements": {
      "href": "https://datatracker.ietf.org/doc/html/rfc9421",
      "name": "RFC-9421: HTTP Message Signatures"
    }
  },
  ...

I thought "how would you be able to represent multiple implementations if implements is an object?

It looks like it is supposed to be an array, according to FEP 844e.

As an aside, I guess not all WP actors are groups? I feel like we've had this conversation before though hehe.

cc silverpill@mitra.social

[julian@community.nodebb.org]

May as well ping obenland@mastodon.social while I am at it

[thisismissem@activitypub.space]

Every single value is equivalent to an array of a single value in JSON-LD... so these are equivalent:

    "implements": {
      "href": "https://datatracker.ietf.org/doc/html/rfc9421",
      "name": "RFC-9421: HTTP Message Signatures"
    }

    "implements": [{
      "href": "https://datatracker.ietf.org/doc/html/rfc9421",
      "name": "RFC-9421: HTTP Message Signatures"
    }]

So it doesn't need "to be an array", but not making it an array could trip up some clients that are not JSON-LD aware.

[thisismissem@activitypub.space]

silverpill@mitra.social the second code example in FEP 844e is wrong though, it uses [ and ] instead of { and } around the "object" in implements

[pfefferle@mastodon.social]

@thisismissem thanks for your input!

So even if it is not wrong in WordPress, I agree with your consumer example and update the implementation to always use arrays even for single objects.

[julian@activitypub.space]

thisismissem said in WordPress and 844e:
> Every single value is equivalent to an array of a single value in JSON-LD... so these are equivalent:

Every day I discover another reason to dislike JSON-LD.

[silverpill@mitra.social]

@thisismissem Fixed! https://codeberg.org/fediverse/fep/pulls/679

cc @pfefferle

[pfefferle@mastodon.social]

@silverpill @thisismissem @technical-discussion can you maybe also point the namespace URI to a proper JSON-LD? I had some issues with debugging tools like browser.pub

[silverpill@mitra.social]

@thisismissem In my FEPs I usually take "JSON-first" approach. Data types are specified because that makes life easier for JSON producers and consumers.

[silverpill@mitra.social]

@pfefferle The namespace is https://w3id.org/fep/844e. I copypasted the actor example into JSON-LD playground, it appears to be working.

[pfefferle@mastodon.social]

@silverpill @technical-discussion /cc @js