Move default mascot configuration to config/

lib/pleroma/user.ex

@@ -1402,4 +1402,24 @@ defmodule Pleroma.User do
     |> put_embed(:info, info_changeset)
     |> update_and_set_cache()
   end
+
+  def get_mascot(%{info: %{mascot: %{} = mascot}}) when not is_nil(mascot) do
+    mascot
+  end
+
+  def get_mascot(%{info: %{mascot: mascot}}) when is_nil(mascot) do
+    # use instance-default
+    config = Pleroma.Config.get([:assets, :mascots])
+    default_mascot = Pleroma.Config.get([:assets, :default_mascot])
+    mascot = Keyword.get(config, default_mascot)
+
+    %{
+      "id" => "default-mascot",
+      "url" => mascot[:url],
+      "preview_url" => mascot[:url],
+      "pleroma" => %{
+        "mime_type" => mascot[:mime_type]
+      }
+    }
+  end
 end

lib/pleroma/user/info.ex

@@ -43,19 +43,7 @@ defmodule Pleroma.User.Info do
     field(:hide_favorites, :boolean, default: true)
     field(:pinned_activities, {:array, :string}, default: [])
     field(:flavour, :string, default: nil)
-
-    field(:mascot, :map,
-      default: %{
-        "id" => "pleromatan",
-        "url" => "/images/pleroma-fox-tan-smol.png",
-        "type" => "image",
-        "preview_url" => "/images/pleroma-fox-tan-smol.png",
-        "pleroma" => %{
-          "mime_type" => "image/png"
-        }
-      }
-    )
-
+    field(:mascot, :map, default: nil)
     field(:emoji, {:array, :map}, default: [])
 
     field(:notification_settings, :map,

lib/pleroma/web/mastodon_api/mastodon_api_controller.ex

@@ -736,7 +736,7 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
   end
 
   def get_mascot(%{assigns: %{user: user}} = conn, _params) do
-    %{info: %{mascot: mascot}} = user
+    mascot = User.get_mascot(user)
 
     conn
     |> json(mascot)
@@ -1364,7 +1364,7 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
             display_sensitive_media: false,
             reduce_motion: false,
             max_toot_chars: limit,
-            mascot: Map.get(user.info.mascot, "url", "/images/pleroma-fox-tan-smol.png")
+            mascot: User.get_mascot(user)["url"]
           },
           rights: %{
             delete_others_notice: present?(user.info.is_moderator),