Allow for attachment to be a single object in user data

lib/pleroma/web/activity_pub/activity_pub.ex

@@ -1545,10 +1545,15 @@ defp normalize_also_known_as(aka) when is_list(aka), do: aka
   defp normalize_also_known_as(aka) when is_binary(aka), do: [aka]
   defp normalize_also_known_as(nil), do: []
 
+  defp normalize_attachment(%{} = attachment), do: [attachment]
+  defp normalize_attachment(attachment) when is_list(attachment), do: attachment
+  defp normalize_attachment(_), do: []
+
   defp object_to_user_data(data, additional) do
     fields =
       data
       |> Map.get("attachment", [])
+      |> normalize_attachment()
       |> Enum.filter(fn %{"type" => t} -> t == "PropertyValue" end)
       |> Enum.map(fn fields -> Map.take(fields, ["name", "value"]) end)
 

test/fixtures/users_mock/takahe_user.json

@@ -0,0 +1,53 @@
+{
+  "@context": [
+    "https://www.w3.org/ns/activitystreams",
+    {
+      "blurhash": "toot:blurhash",
+      "Emoji": "toot:Emoji",
+      "focalPoint": {
+        "@container": "@list",
+        "@id": "toot:focalPoint"
+      },
+      "Hashtag": "as:Hashtag",
+      "manuallyApprovesFollowers": "as:manuallyApprovesFollowers",
+      "sensitive": "as:sensitive",
+      "toot": "http://joinmastodon.org/ns#",
+      "votersCount": "toot:votersCount",
+      "featured": {
+        "@id": "toot:featured",
+        "@type": "@id"
+      }
+    },
+    "https://w3id.org/security/v1"
+  ],
+  "id": "https://fedi.vision/@vote@fedi.vision/",
+  "type": "Person",
+  "toot:discoverable": true,
+  "inbox": "https://fedi.vision/@vote@fedi.vision/inbox/",
+  "publicKey": {
+    "id": "https://fedi.vision/@vote@fedi.vision/#main-key",
+    "owner": "https://fedi.vision/@vote@fedi.vision/",
+    "publicKeyPem": "-----BEGIN PUBLIC KEY-----\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAj2f+uQtdoBO9X/u2Qso4\nxHYdfy8zB24m9Gg982/ts88DAMLxZUzX0JsBWT7coL0Ipf4NSbVaqS6nKrr2P8Qs\nf97wMhowyuYxK22BMPcbpfZkFj3tVT/JkDx2iujBJJ5ZBO5KRlupjDTqV4rOAY7F\n58ad0jK9PsJNJMsJ/b8+0t3Q/K+RqCGVmtK+iPSigOYoiKoquyRzHLTfP+mpOlDa\n3f+uyAbFya7CpcgBx1zz0PALWA+oh/zhZK4yT6719Esa8SDcoJ0ws70zMxWekq1A\n3ia88/Io6SY2qFNBpzzXGO3JK8OFRFtmPV8ZfAh5Pv6y52iuTJ21kxjAG7ZTP/fY\nBQIDAQAB\n-----END PUBLIC KEY-----\n"
+  },
+  "attachment": {
+    "type": "PropertyValue",
+    "value": "<a href=\"https://fedivision.party/vote\" rel=\"nofollow\"><span class=\"invisible\">https://</span>fedivision.party/vote</a>",
+    "name": "More details"
+  },
+  "endpoints": {
+    "sharedInbox": "https://fedi.vision/inbox/"
+  },
+  "followers": "https://fedi.vision/@vote@fedi.vision/followers/",
+  "following": "https://fedi.vision/@vote@fedi.vision/following/",
+  "icon": {
+    "type": "Image",
+    "mediaType": "image/webp",
+    "url": "https://eu-central-1.linodeobjects.com:443/st4/profile_images/2024/5/9/RwqTbeYx16gauXPXvt-CaysOnGw.webp"
+  },
+  "name": "FediVision Vote Bot",
+  "outbox": "https://fedi.vision/@vote@fedi.vision/outbox/",
+  "preferredUsername": "vote",
+  "published": "2024-05-09T09:04:04Z",
+  "summary": "<p>New in 2024, this is the bot that will count your #Fedivision vote! Accept no substitutes!</p><p>Send this account a toot in the form<br>  vote ABCD EFGH IJKL<br>substituting the (up to) three codes for the songs you want to win. Punctuation ignored, case insensitive, order is unimportant. Only your latest toot counts, so change your vote with a new toot.</p>",
+  "url": "https://fedi.vision/@vote/"
+}

test/pleroma/web/activity_pub/activity_pub_test.exs

@@ -233,6 +233,29 @@ test "works for bridgy actors" do
              }
     end
 
+    test "works for takahe actors" do
+      user_id = "https://fedi.vision/@vote@fedi.vision/"
+
+      Tesla.Mock.mock(fn
+        %{method: :get, url: ^user_id} ->
+          %Tesla.Env{
+            status: 200,
+            body: File.read!("test/fixtures/users_mock/takahe_user.json"),
+            headers: [{"content-type", "application/activity+json"}]
+          }
+      end)
+
+      {:ok, user} = ActivityPub.make_user_from_ap_id(user_id)
+
+      assert user.actor_type == "Person"
+
+      assert [
+               %{
+                 "name" => "More details"
+               }
+             ] = user.fields
+    end
+
     test "fetches user featured collection" do
       ap_id = "https://example.com/users/lain"