From 6f090f981b26274c87b9df88e1bcb2719f46814b Mon Sep 17 00:00:00 2001
From: Mark Felder <feld@FreeBSD.org>
Date: Mon, 25 Mar 2019 18:47:04 -0500
Subject: [PATCH] Attempt to fix incorrect federation of default instance
 avatars

---
 lib/pleroma/user.ex                             |  8 ++++++++
 lib/pleroma/web/activity_pub/utils.ex           | 15 +++++++++++++++
 lib/pleroma/web/activity_pub/views/user_view.ex |  5 +----
 3 files changed, 24 insertions(+), 4 deletions(-)

diff --git a/lib/pleroma/user.ex b/lib/pleroma/user.ex
index 41289b4d0..ee5eb8efa 100644
--- a/lib/pleroma/user.ex
+++ b/lib/pleroma/user.ex
@@ -90,6 +90,14 @@ defmodule Pleroma.User do
     end
   end
 
+  # Do not return instance default avatar for federation
+  def avatar_url_ap(user) do
+    case user.avatar do
+      %{"url" => [%{"href" => href} | _]} -> href
+      _ -> nil
+    end
+  end
+
   def banner_url(user) do
     case user.info.banner do
       %{"url" => [%{"href" => href} | _]} -> href
diff --git a/lib/pleroma/web/activity_pub/utils.ex b/lib/pleroma/web/activity_pub/utils.ex
index 2e9ffe41c..6d74738f0 100644
--- a/lib/pleroma/web/activity_pub/utils.ex
+++ b/lib/pleroma/web/activity_pub/utils.ex
@@ -230,6 +230,21 @@ defmodule Pleroma.Web.ActivityPub.Utils do
     end)
   end
 
+  # Only federate user icon if not nil
+  # Prevents federating instance default avatars
+  def maybe_make_icon(user) do
+    if User.avatar_url_ap(user) do
+      %{
+        "icon" => %{
+          "type" => "Image",
+          "url" => User.avatar_url_ap(user)
+        }
+      }
+    else
+      []
+    end
+  end
+
   #### Like-related helpers
 
   @doc """
diff --git a/lib/pleroma/web/activity_pub/views/user_view.ex b/lib/pleroma/web/activity_pub/views/user_view.ex
index 3d00dcbf2..f5c86d360 100644
--- a/lib/pleroma/web/activity_pub/views/user_view.ex
+++ b/lib/pleroma/web/activity_pub/views/user_view.ex
@@ -87,16 +87,13 @@ defmodule Pleroma.Web.ActivityPub.UserView do
         "publicKeyPem" => public_key
       },
       "endpoints" => endpoints,
-      "icon" => %{
-        "type" => "Image",
-        "url" => User.avatar_url(user)
-      },
       "image" => %{
         "type" => "Image",
         "url" => User.banner_url(user)
       },
       "tag" => user.info.source_data["tag"] || []
     }
+    |> Map.merge(Utils.maybe_make_icon(user))
     |> Map.merge(Utils.make_json_ld_header())
   end