Add fields limits to instance metadata, add tests

lib/pleroma/web/mastodon_api/views/instance_view.ex

@@ -38,7 +38,8 @@ def render("show.json", _) do
         metadata: %{
           account_activation_required: Keyword.get(instance, :account_activation_required),
           features: features(),
-          federation: federation()
+          federation: federation(),
+          fields_limits: fields_limits()
         },
         vapid_public_key: Keyword.get(Pleroma.Web.Push.vapid_config(), :public_key)
       }
@@ -89,4 +90,13 @@ def federation do
     end
     |> Map.put(:enabled, Config.get([:instance, :federating]))
   end
+
+  def fields_limits do
+    %{
+      maxFields: Config.get([:instance, :max_account_fields]),
+      maxRemoteFields: Config.get([:instance, :max_remote_account_fields]),
+      nameLength: Config.get([:instance, :account_field_name_length]),
+      valueLength: Config.get([:instance, :account_field_value_length])
+    }
+  end
 end

test/web/mastodon_api/controllers/instance_controller_test.exs

@@ -35,8 +35,10 @@ test "get instance information", %{conn: conn} do
              "background_image" => _
            } = result
 
+    assert result["pleroma"]["metadata"]["account_activation_required"] != nil
     assert result["pleroma"]["metadata"]["features"]
     assert result["pleroma"]["metadata"]["federation"]
+    assert result["pleroma"]["metadata"]["fields_limits"]
     assert result["pleroma"]["vapid_public_key"]
 
     assert email == from_config_email