support Pleroma

[snarfed]

https://gitgud.io/lambadalambda/pleroma . haven't found a website apart from that. doesn't seem to be used very widely. claims to be OStatus compatible.

Known interop problems so far:

• Likes and other interactions with Pleroma posts crash Pleroma
• Bridgy Fed profiles show up in search results with BF's domain, eg @foo.com@fed.brid.gy, not @foo.com@foo.com. Example: https://cawfee.club/search?query=snarfed.org , click on the People tab

TODO: file issues on https://git.pleroma.social/pleroma/pleroma/-/issues for these ^

[leenaars]

The project meanwhile seems to have matured to its own domain and git repo:

https://git.pleroma.social/pleroma/pleroma

[normikoto]

Should note that it's also ActivityPub-compatible as well now.

[vikanezrimaya]

Pleroma seems to gain popularity. It even caused some drama on the fediverse, causing in defederation with several mastodon instances. It is said to be light on resources and I'm moving to it (if you need some assistance with testing, I'd be happy to help!)

[aqeeliz]

Pleroma is compatible with Mastodon clients, so if Mastodon is working, Pleroma should (at least theoretically) work too.

[swentel]

While working on the Drupal plugin, I finally got successful requests with Pleroma.
You can see a notice at https://kiwifarms.cc/notice/9zpG1WBnWG67cro7bk

@snarfed thinks to look out for:

• Accept request: you need to pass on the 'id' from the received Follow object into the 'object'. Otherwise it won't work
• Posting notes/reply: the id of the activity and object must be different. The object also needs the attributedTo property.

That should do it.

[snarfed]

thank you @swentel! great sleuthing, really useful info.

and funny coincidence, i've been troubleshooting Pleroma compatibility in Bridgy itself recently too, eg snarfed/bridgy#977 .

[jk-na]

I'm sure this doesn't add much of any substance that you didn't already know, however, I've just configured my site to use bridgy-fed and was successfully able to reply to a mastodon post (yours @snarfed ) but not a pleroma post on my site.

The following is the feedback from webmention.app:

source= https://fed.brid.gy/
target= 502 https://fed.brid.gy/webmention
400 Client Error: Bad Request for url: https://social.nipponalba.scot/users/jk/inbox ; "error" 

Apologies in advance if once again this is down to my particular instance not playing ball.

[jk-na]

The following are the (debug enabled) logs of an attempt to reply to pleroma:

Mar 10 13:54:17 MatrixRock pleroma[7585]: 13:54:17.446 [info] POST /users/jk/inbox
Mar 10 13:54:17 MatrixRock pleroma[7585]: 13:54:17.448 request_id=Fmr_mvne5kH7O3MADlJi [debug] POST /users/jk/inbox
Mar 10 13:54:17 MatrixRock pleroma[7585]: 13:54:17.462 request_id=Fmr_mvne5kH7O3MADlJi [debug] Processing with Pleroma.Web.ActivityPub.ActivityPubController.inbox/2
Mar 10 13:54:17 MatrixRock pleroma[7585]:   Parameters: %{"@context" => "https://www.w3.org/ns/activitystreams", "nickname" => "jk", "object" => %{"@context" => "https://www.w3.org/ns/activitystreams", "attachment" => [%{"name" => "J K 🇯🇵🏴󠁧󠁢󠁳󠁣󠁴󠁿's avatar Wed, 10 Mar 2021 10:50:00 GMT\nRight then, if I've fixed my atom feed and added the link to bridgy fed for posts.. nginx rule added.. so long as my beehive -&gt; webmention.app process works then maybe my site is now activitypubbed.. maybe.. (https://jk.nipponalba.scot/note/6048a457/)", "type" => "Note"}], "attributedTo" => [%{"icon" => [%{"type" => "Image", "url" => "https://jk.nipponalba.scot/images/profile.jpg"}], "id" => "https://fed.brid.gy/jk.nipponalba.scot", "image" => [%{"type" => "Image", "url" => "https://jk.nipponalba.scot/images/profile.jpg"}], "name" => "J K 🇯🇵🏴󠁧󠁢󠁳󠁣󠁴󠁿 | personal site", "preferredUsername" => "jk.nipponalba.scot", "type" => "Person", "url" => "https://fed.brid.gy/r/https://jk.nipponalba.scot"}], "cc" => ["https://www.w3.org/ns/activitystreams#Public", "https://social.nipponalba.scot/users/jk", "https://social.nipponalba.scot/users/jk/followers"], "content" => "<br/><p>If you can see this, it worked!</p>", "id" => "https://fed.brid.gy/r/https://jk.nipponalba.scot/response/6048bcde/", "inReplyTo" => "https://social.nipponalba.scot/objects/1bf56236-fe1f-4f3c-9978-7b3eabcf73b5", "name" => "If you can see this, it worked!", "published" => "10 Mar 2021 12:34 GMT", "tag" => [%{"href" => "https://social.nipponalba.scot/users/jk", "type" => "Mention"}, %{"href" => "https://social.nipponalba.scot/users/jk", "type" => "Mention"}], "type" => "Note", "url" => "https://fed.brid.gy/r/https://jk.nipponalba.scot/response/6048bcde/", "urls" => [%{"value" => "https://jk.nipponalba.scot/response/6048bcde/"}, %{"value" => "https://fed.brid.gy/"}]}, "type" => "Create"}
Mar 10 13:54:17 MatrixRock pleroma[7585]:   Pipelines: [:activitypub]
Mar 10 13:54:21 MatrixRock pleroma[7585]: 13:54:21.128 request_id=Fmr_mvne5kH7O3MADlJi [debug] Couldn't parse XML: "{\n  \"subject\": \"acct:jk.nipponalba.scot@jk.nipponalba.scot\",\n  \"aliases\": [\n    \"https://jk.nipponalba.scot/\",\n    \"https://social.nipponalba.scot/jk\",\n    \"https://px.nipponalba.scot/jk\"\n  ],\n  \"magic_keys\": [\n    {\n      \"value\": \"data:application/magic-public-key,RSA.3Wq8cM8ZzWydoZ3ljmB5GCaMJKcooELcZVHdFY4EkB8MVPZFqn26xwVQA8k7XKov-HQM0Hd1JwiNUzzZ5-Cz2WPT1qIlnd2ZdfxHyxcTuy1PRku33Ei0JMo-STYUpTdyPED7nWW8m64EQ1WWKKA3tQ_uduSixqgtmo6yFTog0U0=.AQAB\"\n    }\n  ],\n  \"links\": [\n    {\n      \"rel\": \"http://webfinger.net/rel/profile-page\",\n      \"type\": \"text/html\",\n      \"href\": \"https://jk.nipponalba.scot/\"\n    },\n    {\n      \"rel\": \"http://webfinger.net/rel/profile-page\",\n      \"type\": \"text/html\",\n      \"href\": \"https://social.nipponalba.scot/jk\"\n    },\n    {\n      \"rel\": \"http://webfinger.net/rel/profile-page\",\n      \"type\": \"text/html\",\n      \"href\": \"https://px.nipponalba.scot/jk\"\n    },\n    {\n      \"rel\": \"http://webfinger.net/rel/avatar\",\n      \"href\": {\n        \"value\": \"https://jk.nipponalba.scot/images/profile.jpg\",\n        \"alt\": \"profile picture\"\n      }\n    },\n    {\n      \"rel\": \"canonical_uri\",\n      \"type\": \"text/html\",\n      \"href\": \"https://jk.nipponalba.scot/\"\n    },\n    {\n      \"rel\": \"self\",\n      \"type\": \"application/activity+json\",\n      \"href\": \"https://fed.brid.gy/jk.nipponalba.scot\"\n    },\n    {\n      \"rel\": \"inbox\",\n      \"type\": \"application/activity+json\",\n      \"href\": \"https://fed.brid.gy/jk.nipponalba.scot/inbox\"\n    },\n    {\n      \"rel\": \"http://schemas.google.com/g/2010#updates-from\",\n      \"type\": \"application/atom+xml\",\n      \"href\": \"http://jk.nipponalba.scot/atom.xml\"\n    },\n    {\n      \"rel\": \"hub\",\n      \"href\": \"https://bridgy-fed.superfeedr.com/\"\n    },\n    {\n      \"rel\": \"magic-public-key\",\n      \"href\": \"data:application/magic-public-key,RSA.3Wq8cM8ZzWydoZ3ljmB5GCaMJKcooELcZVHdFY4EkB8MVPZFqn26xwVQA8k7XKov-HQM0Hd1JwiNUzzZ5-Cz2WPT1qIlnd2ZdfxHyxcTuy1PRku33Ei0JMo-STYUpTdyPED7nWW8m64EQ1WWKKA3tQ_uduSixqgtmo6yFTog0U0=.AQAB\"\n    },\n    {\n      \"rel\": \"salmon\",\n      \"href\": \"https://fed.brid.gy/jk.nipponalba.scot/salmon\"\n    }\n  ]\n}"
Mar 10 13:54:21 MatrixRock pleroma[7585]: 13:54:21.130 request_id=Fmr_mvne5kH7O3MADlJi [debug] Unhandled type: "text/html"
Mar 10 13:54:21 MatrixRock pleroma[7585]: 13:54:21.131 request_id=Fmr_mvne5kH7O3MADlJi [debug] Unhandled type: "text/html"
Mar 10 13:54:21 MatrixRock pleroma[7585]: 13:54:21.131 request_id=Fmr_mvne5kH7O3MADlJi [debug] Unhandled type: "text/html"
Mar 10 13:54:21 MatrixRock pleroma[7585]: 13:54:21.132 request_id=Fmr_mvne5kH7O3MADlJi [debug] Unhandled type: nil
Mar 10 13:54:21 MatrixRock pleroma[7585]: 13:54:21.133 request_id=Fmr_mvne5kH7O3MADlJi [debug] Unhandled type: "text/html"
Mar 10 13:54:21 MatrixRock pleroma[7585]: 13:54:21.134 request_id=Fmr_mvne5kH7O3MADlJi [debug] Unhandled type: "application/activity+json"
Mar 10 13:54:21 MatrixRock pleroma[7585]: 13:54:21.136 request_id=Fmr_mvne5kH7O3MADlJi [debug] Unhandled type: "application/atom+xml"
Mar 10 13:54:21 MatrixRock pleroma[7585]: 13:54:21.137 request_id=Fmr_mvne5kH7O3MADlJi [debug] Unhandled type: nil
Mar 10 13:54:21 MatrixRock pleroma[7585]: 13:54:21.138 request_id=Fmr_mvne5kH7O3MADlJi [debug] Unhandled type: nil
Mar 10 13:54:21 MatrixRock pleroma[7585]: 13:54:21.139 request_id=Fmr_mvne5kH7O3MADlJi [debug] Unhandled type: nil
Mar 10 13:54:21 MatrixRock pleroma[7585]: 13:54:21.140 request_id=Fmr_mvne5kH7O3MADlJi [debug] Could not validate against known public keys: {:error, {:error, "acct:jk.nipponalba.scot@jk.nipponalba.scot"}}
Mar 10 13:54:21 MatrixRock pleroma[7585]: 13:54:21.141 request_id=Fmr_mvne5kH7O3MADlJi [debug] Signature missing or not from author, relayed Create message, fetching object from source
Mar 10 13:54:21 MatrixRock pleroma[7585]: 13:54:21.150 request_id=Fmr_mvne5kH7O3MADlJi [debug] QUERY OK source="objects" db=6.3ms queue=0.4ms idle=261.1ms
Mar 10 13:54:21 MatrixRock pleroma[7585]: SELECT o0."id", o0."data", o0."inserted_at", o0."updated_at" FROM "objects" AS o0 WHERE ((o0."data")->>'id' = $1) ["https://fed.brid.gy/r/https://jk.nipponalba.scot/response/6048bcde/"]
Mar 10 13:54:21 MatrixRock pleroma[7585]: 13:54:21.150 request_id=Fmr_mvne5kH7O3MADlJi [debug] Fetching object https://fed.brid.gy/r/https://jk.nipponalba.scot/response/6048bcde/ via AP
Mar 10 13:54:22 MatrixRock pleroma[7585]: 13:54:22.200 request_id=Fmr_mvne5kH7O3MADlJi [debug] Sent 200 in 4751ms
Mar 10 13:54:22 MatrixRock pleroma[7585]: 13:54:22.200 request_id=Fmr_mvne5kH7O3MADlJi [info] Sent 200 in 4754ms

[snarfed]

Thanks for the details!

Here's also the complete AS2 activity that Bridgy Fed sent to https://social.nipponalba.scot/users/jk/inbox , and got a 200 back for, from Bridgy Fed's log.

One thing I notice is that the object has an id, but the activity doesn't, and @swentel said above:

Posting notes/reply: the id of the activity and object must be different. The object also needs the attributedTo property.

I can look into adding an activity id.

{
  "@context": "https://www.w3.org/ns/activitystreams",
  "type": "Create",
  "object": {
    "published": "10 Mar 2021 12:34 GMT",
    "content": "<br/><p>If you can see this, it worked!</p>",
    "url": "https://fed.brid.gy/r/https://jk.nipponalba.scot/response/6048bcde/",
    "urls": [
      {"value": "https://jk.nipponalba.scot/response/6048bcde/"},
      {"value": "https://fed.brid.gy/"}
    ],
    "inReplyTo": "https://social.nipponalba.scot/objects/1bf56236-fe1f-4f3c-9978-7b3eabcf73b5",
    "@context": "https://www.w3.org/ns/activitystreams",
    "type": "Note",
    "name": "If you can see this, it worked!",
    "attachment": [
      {
        "type": "Note",
        "name": "J K \ud83c\uddef\ud83c\uddf5\ud83c\udff4\udb40\udc67\udb40\udc62\udb40\udc73\udb40\udc63\udb40\udc74\udb40\udc7f's avatar Wed, 10 Mar 2021 10:50:00 GMT\nRight then, if I've fixed my atom feed and added the link to bridgy fed for posts.. nginx rule added.. so long as my beehive -&gt; webmention.app process works then maybe my site is now activitypubbed.. maybe.. (https://jk.nipponalba.scot/note/6048a457/)"
      }
    ],
    "attributedTo": [
      {
        "url": "https://fed.brid.gy/r/https://jk.nipponalba.scot",
        "type": "Person",
        "name": "J K \ud83c\uddef\ud83c\uddf5\ud83c\udff4\udb40\udc67\udb40\udc62\udb40\udc73\udb40\udc63\udb40\udc74\udb40\udc7f | personal site",
        "image": [
          {
            "url": "https://jk.nipponalba.scot/images/profile.jpg",
            "type": "Image"
          }
        ],
        "icon": [
          {
            "url": "https://jk.nipponalba.scot/images/profile.jpg",
            "type": "Image"
          }
        ],
        "preferredUsername": "jk.nipponalba.scot",
        "id": "https://fed.brid.gy/jk.nipponalba.scot"
      }
    ],
    "tag": [
      {
        "type": "Mention",
        "href": "https://social.nipponalba.scot/users/jk"
      },
      {
        "type": "Mention",
        "href": "https://social.nipponalba.scot/users/jk"
      }
    ],
    "id": "https://fed.brid.gy/r/https://jk.nipponalba.scot/response/6048bcde/",
    "cc": [
      "https://www.w3.org/ns/activitystreams#Public",
      "https://social.nipponalba.scot/users/jk",
      "https://social.nipponalba.scot/users/jk/followers"
    ]
  }
}

[snarfed]

I've added an id to outbound AS2 activities. Feel free to try again!

[jk-na]

I've tried again and am seeing a similar pattern to above - there are 200 responses but there are also errors relating to signatures and failures to parse xml.

Mar 11 09:42:22 MatrixRock pleroma: request_id=FmtAcEQM0DZ8z1UAFDvB [debug] POST /users/jk/inbox
Mar 11 09:42:22 MatrixRock pleroma: request_id=FmtAcEQM0DZ8z1UAFDvB [debug] Processing with Pleroma.Web.ActivityPub.ActivityPubController.inbox/2#012  Parameters: %{"@context" => "https://www.w3.org/ns/activitystreams", "id" => "https://fed.brid.gy/r/https://jk.nipponalba.scot/response/6049d413/#bridgy-fed-create", "nickname" => "jk", "object" => %{"@context" => "https://www.w3.org/ns/activitystreams", "attributedTo" => [%{"icon" => [%{"type" => "Image", "url" => "https://jk.nipponalba.scot/images/profile.jpg"}], "id" => "https://fed.brid.gy/jk.nipponalba.scot", "image" => [%{"type" => "Image", "url" => "https://jk.nipponalba.scot/images/profile.jpg"}], "name" => "J K 🇯🇵🏴󠁧󠁢󠁳󠁣󠁴󠁿 | personal site", "preferredUsername" => "jk.nipponalba.scot", "type" => "Person", "url" => "https://fed.brid.gy/r/https://jk.nipponalba.scot"}], "cc" => ["https://www.w3.org/ns/activitystreams#Public", "https://social.nipponalba.scot/users/jk", "https://social.nipponalba.scot/users/jk/followers"], "content" => "<br/><p>Testing</p>", "id" => "https://fed.brid.gy/r/https://jk.nipponalba.scot/response/6049d413/", "inReplyTo" => "https://social.nipponalba.scot/objects/c341db0a-ad7e-406a-9b9f-07b575ce9f61", "name" => "Testing", "published" => "11 Mar 2021 08:25 GMT", "tag" => [%{"href" => "https://social.nipponalba.scot/users/jk", "type" => "Mention"}, %{"href" => "https://social.nipponalba.scot/users/jk", "type" => "Mention"}], "type" => "Note", "url" => "https://fed.brid.gy/r/https://jk.nipponalba.scot/response/6049d413/", "urls" => [%{"value" => "https://jk.nipponalba.scot/response/6049d413/"}, %{"value" => "https://fed.brid.gy/"}]}, "type" => "Create"}#012  Pipelines: [:activitypub]
Mar 11 09:42:25 MatrixRock pleroma: [debug] QUERY OK source="users" db=1077.5ms decode=0.7ms queue=0.1ms idle=110.3ms#012SELECT distinct split_part(u0."nickname", '@', 2) FROM "users" AS u0 WHERE (u0."local" != $1) [true]
Mar 11 09:42:25 MatrixRock pleroma: [debug] QUERY OK source="users" db=4.6ms queue=0.2ms idle=194.6ms#012SELECT sum(u0."note_count") FROM "users" AS u0 WHERE (NOT (u0."nickname" IS NULL)) AND (NOT (u0."nickname" LIKE 'internal.%')) AND (u0."local" = $1) [true]
Mar 11 09:42:25 MatrixRock pleroma: [debug] QUERY OK source="users" db=4.9ms queue=1.1ms idle=197.8ms#012SELECT count(u0."id") FROM "users" AS u0 WHERE (u0."is_active" = TRUE) AND (u0."local" = TRUE) AND (NOT (u0."nickname" IS NULL)) AND (NOT (u0."invisible")) []
Mar 11 09:42:25 MatrixRock pleroma: request_id=FmtAcEQM0DZ8z1UAFDvB [debug] Couldn't parse XML: "{\n  \"subject\": \"acct:jk.nipponalba.scot@jk.nipponalba.scot\",\n  \"aliases\": [\n    \"https://jk.nipponalba.scot/\",\n    \"https://social.nipponalba.scot/jk\",\n    \"https://px.nipponalba.scot/jk\"\n  ],\n  \"magic_keys\": [\n    {\n      \"value\": \"data:application/magic-public-key,RSA.3Wq8cM8ZzWydoZ3ljmB5GCaMJKcooELcZVHdFY4EkB8MVPZFqn26xwVQA8k7XKov-HQM0Hd1JwiNUzzZ5-Cz2WPT1qIlnd2ZdfxHyxcTuy1PRku33Ei0JMo-STYUpTdyPED7nWW8m64EQ1WWKKA3tQ_uduSixqgtmo6yFTog0U0=.AQAB\"\n    }\n  ],\n  \"links\": [\n    {\n      \"rel\": \"http://webfinger.net/rel/profile-page\",\n      \"type\": \"text/html\",\n      \"href\": \"https://jk.nipponalba.scot/\"\n    },\n    {\n      \"rel\": \"http://webfinger.net/rel/profile-page\",\n      \"type\": \"text/html\",\n      \"href\": \"https://social.nipponalba.scot/jk\"\n    },\n    {\n      \"rel\": \"http://webfinger.net/rel/profile-page\",\n      \"type\": \"text/html\",\n      \"href\": \"https://px.nipponalba.scot/jk\"\n    },\n    {\n      \"rel\": \"http://webfinger.net/rel/avatar\",\n      \"href\": {\n        \"value\": \"https://jk.nipponalba.scot/images/profile.jpg\",\n        \"alt\": \"profile picture\"\n      }\n    },\n    {\n      \"rel\": \"canonical_uri\",\n      \"type\": \"text/html\",\n      \"href\": \"https://jk.nipponalba.scot/\"\n    },\n    {\n      \"rel\": \"self\",\n      \"type\": \"application/activity+json\",\n      \"href\": \"https://fed.brid.gy/jk.nipponalba.scot\"\n    },\n    {\n      \"rel\": \"inbox\",\n      \"type\": \"application/activity+json\",\n      \"href\": \"https://fed.brid.gy/jk.nipponalba.scot/inbox\"\n    },\n    {\n      \"rel\": \"http://schemas.google.com/g/2010#updates-from\",\n      \"type\": \"application/atom+xml\",\n      \"href\": \"http://jk.nipponalba.scot/atom.xml\"\n    },\n    {\n      \"rel\": \"hub\",\n      \"href\": \"https://bridgy-fed.superfeedr.com/\"\n    },\n    {\n      \"rel\": \"magic-public-key\",\n      \"href\": \"data:application/magic-public-key,RSA.3Wq8cM8ZzWydoZ3ljmB5GCaMJKcooELcZVHdFY4EkB8MVPZFqn26xwVQA8k7XKov-HQM0Hd1JwiNUzzZ5-Cz2WPT1qIlnd2ZdfxHyxcTuy1PRku33Ei0JMo-STYUpTdyPED7nWW8m64EQ1WWKKA3tQ_uduSixqgtmo6yFTog0U0=.AQAB\"\n    },\n    {\n      \"rel\": \"salmon\",\n      \"href\": \"https://fed.brid.gy/jk.nipponalba.scot/salmon\"\n    }\n  ]\n}"
Mar 11 09:42:25 MatrixRock pleroma: request_id=FmtAcEQM0DZ8z1UAFDvB [debug] Unhandled type: "text/html"
Mar 11 09:42:25 MatrixRock pleroma: request_id=FmtAcEQM0DZ8z1UAFDvB [debug] Unhandled type: "text/html"
Mar 11 09:42:25 MatrixRock pleroma: request_id=FmtAcEQM0DZ8z1UAFDvB [debug] Unhandled type: "text/html"
Mar 11 09:42:25 MatrixRock pleroma: request_id=FmtAcEQM0DZ8z1UAFDvB [debug] Unhandled type: nil
Mar 11 09:42:25 MatrixRock pleroma: request_id=FmtAcEQM0DZ8z1UAFDvB [debug] Unhandled type: "text/html"
Mar 11 09:42:25 MatrixRock pleroma: request_id=FmtAcEQM0DZ8z1UAFDvB [debug] Unhandled type: "application/activity+json"
Mar 11 09:42:25 MatrixRock pleroma: request_id=FmtAcEQM0DZ8z1UAFDvB [debug] Unhandled type: "application/atom+xml"
Mar 11 09:42:25 MatrixRock pleroma: request_id=FmtAcEQM0DZ8z1UAFDvB [debug] Unhandled type: nil
Mar 11 09:42:25 MatrixRock pleroma: request_id=FmtAcEQM0DZ8z1UAFDvB [debug] Unhandled type: nil
Mar 11 09:42:25 MatrixRock pleroma: request_id=FmtAcEQM0DZ8z1UAFDvB [debug] Unhandled type: nil
Mar 11 09:42:25 MatrixRock pleroma: request_id=FmtAcEQM0DZ8z1UAFDvB [debug] Could not validate against known public keys: {:error, {:error, "acct:jk.nipponalba.scot@jk.nipponalba.scot"}}
Mar 11 09:42:25 MatrixRock pleroma: request_id=FmtAcEQM0DZ8z1UAFDvB [debug] Signature missing or not from author, relayed Create message, fetching object from source
Mar 11 09:42:25 MatrixRock pleroma: request_id=FmtAcEQM0DZ8z1UAFDvB [debug] QUERY OK source="objects" db=5.6ms queue=0.4ms idle=258.2ms#012SELECT o0."id", o0."data", o0."inserted_at", o0."updated_at" FROM "objects" AS o0 WHERE ((o0."data")->>'id' = $1) ["https://fed.brid.gy/r/https://jk.nipponalba.scot/response/6049d413/"]
Mar 11 09:42:25 MatrixRock pleroma: request_id=FmtAcEQM0DZ8z1UAFDvB [debug] Fetching object https://fed.brid.gy/r/https://jk.nipponalba.scot/response/6049d413/ via AP
Mar 11 09:42:26 MatrixRock pleroma: request_id=FmtAcEQM0DZ8z1UAFDvB [debug] QUERY OK source="objects" db=6.4ms queue=0.2ms idle=348.7ms#012SELECT o0."id", o0."data", o0."inserted_at", o0."updated_at" FROM "objects" AS o0 WHERE ((o0."data")->>'id' = $1) ["https://fed.brid.gy/r/https://jk.nipponalba.scot/response/6049d413/#bridgy-fed-create"]
Mar 11 09:42:26 MatrixRock pleroma: request_id=FmtAcEQM0DZ8z1UAFDvB [debug] Sent 200 in 3997ms

Not sure if perhaps:
Could not validate against known public keys: {:error, {:error, "acct:jk.nipponalba.scot@jk.nipponalba.scot"}}
or
Couldn't parse XML
are at all relevant?

The first of those seems similar in nature to the pixelfed error, could it be that the AP spec has it that the key needs to be formatted in a certain way (which pixelfed and pleroma perhaps require) but mastodon have a workaround in place that converts one format to the other?

[jk-na]

The mastodon activitypub page has the key id in the format of "https://mastodon.social/users/Gargron#main-key" rather than the webfinger format above. I may however be reading way too much into this, and it could well be a red herring.

[snarfed]

@jk-na those are all good clues!

I did notice one other quirk: it looks like your site's redirects to Bridgy Fed are duplicating the query parameters. eg https://jk.nipponalba.scot/.well-known/webfinger?resource=acct:jk.nipponalba.scot@jk.nipponalba.scot currently redirects to https://fed.brid.gy/.well-known/webfinger?resource=acct:jk.nipponalba.scot@jk.nipponalba.scot?resource=acct:jk.nipponalba.scot@jk.nipponalba.scot. Bridgy Fed still serves that request fine though, for just jk.nipponalba.scot@jk.nipponalba.scot, so I doubt it's the cause here.