Pass remote follow avatar into media proxy

lib/pleroma/web/twitter_api/views/remote_follow_view.ex

@@ -6,5 +6,9 @@ defmodule Pleroma.Web.TwitterAPI.RemoteFollowView do
   use Pleroma.Web, :view
   import Phoenix.HTML.Form
 
-  defdelegate avatar_url(user), to: Pleroma.User
+  def avatar_url(user) do
+    user
+    |> Pleroma.User.avatar_url()
+    |> Pleroma.Web.MediaProxy.url()
+  end
 end

test/pleroma/web/twitter_api/remote_follow_controller_test.exs

@@ -410,4 +410,49 @@ test "returns error when user is blocked", %{conn: conn} do
       assert response =~ "Error following account"
     end
   end
+
+  describe "avatar url" do
+    test "without media proxy" do
+      clear_config([:media_proxy, :enabled], false)
+
+      user =
+        insert(:user, %{
+          local: false,
+          avatar: %{"url" => [%{"href" => "https://remote.org/avatar.png"}]}
+        })
+
+      avatar_url = Pleroma.Web.TwitterAPI.RemoteFollowView.avatar_url(user)
+
+      assert avatar_url == "https://remote.org/avatar.png"
+    end
+
+    test "with media proxy" do
+      clear_config([:media_proxy, :enabled], true)
+
+      user =
+        insert(:user, %{
+          local: false,
+          avatar: %{"url" => [%{"href" => "https://remote.org/avatar.png"}]}
+        })
+
+      avatar_url = Pleroma.Web.TwitterAPI.RemoteFollowView.avatar_url(user)
+      url = Pleroma.Web.Endpoint.url()
+
+      assert String.starts_with?(avatar_url, url)
+    end
+
+    test "local avatar is not proxied" do
+      clear_config([:media_proxy, :enabled], true)
+
+      user =
+        insert(:user, %{
+          local: true,
+          avatar: %{"url" => [%{"href" => "#{Pleroma.Web.Endpoint.url()}/localuser/avatar.png"}]}
+        })
+
+      avatar_url = Pleroma.Web.TwitterAPI.RemoteFollowView.avatar_url(user)
+
+      assert avatar_url == "#{Pleroma.Web.Endpoint.url()}/localuser/avatar.png"
+    end
+  end
 end