nodeinfo: gather supported protocol names from federation modules

lib/pleroma/web/activity_pub/publisher.ex

@@ -147,4 +147,6 @@ def gather_webfinger_links(%User{} = user) do
       }
     ]
   end
+
+  def gather_nodeinfo_protocol_names, do: ["activitypub"]
 end

lib/pleroma/web/federator/publisher.ex

@@ -79,4 +79,17 @@ def gather_webfinger_links(%User{} = user) do
       links ++ module.gather_webfinger_links(user)
     end)
   end
+
+  @doc """
+  Gathers nodeinfo protocol names supported by the federation module.
+  """
+  @callback gather_nodeinfo_protocol_names() :: list()
+
+  @spec gather_nodeinfo_protocol_names() :: list()
+  def gather_nodeinfo_protocol_names do
+    Config.get([:instance, :federation_publisher_modules])
+    |> Enum.reduce([], fn module, links ->
+      links ++ module.gather_nodeinfo_protocol_names()
+    end)
+  end
 end

lib/pleroma/web/nodeinfo/nodeinfo_controller.ex

@@ -10,6 +10,7 @@ defmodule Pleroma.Web.Nodeinfo.NodeinfoController do
   alias Pleroma.User
   alias Pleroma.Web
   alias Pleroma.Web.ActivityPub.MRF
+  alias Pleroma.Web.Federator.Publisher
 
   plug(Pleroma.Web.FederatingPlug)
 
@@ -137,7 +138,7 @@ def raw_nodeinfo do
         name: Pleroma.Application.name() |> String.downcase(),
         version: Pleroma.Application.version()
       },
-      protocols: ["ostatus", "activitypub"],
+      protocols: Publisher.gather_nodeinfo_protocol_names(),
       services: %{
         inbound: [],
         outbound: []

lib/pleroma/web/salmon/salmon.ex

@@ -264,4 +264,6 @@ def gather_webfinger_links(%User{} = user) do
       }
     ]
   end
+
+  def gather_nodeinfo_protocol_names, do: []
 end

lib/pleroma/web/websub/websub.ex

@@ -328,4 +328,6 @@ def gather_webfinger_links(%User{} = user) do
       }
     ]
   end
+
+  def gather_nodeinfo_protocol_names, do: ["ostatus"]
 end