fix quoting of custom emoji

Fixes #3

lib/pleroma/emoji.ex

@@ -146,4 +146,23 @@ def is_unicode_emoji?(unquote(emoji)), do: true
   end
 
   def is_unicode_emoji?(_), do: false
+
+  def stripped_name(name) when is_binary(name) do
+    name
+    |> String.replace_leading(":", "")
+    |> String.replace_trailing(":", "")
+  end
+
+  def stripped_name(name), do: name
+
+  def maybe_quote(name) when is_binary(name) do
+    if is_unicode_emoji?(name) do
+      name
+    else
+      ":#{name}:"
+    end
+  end
+
+  def maybe_quote(name), do: name
+    
 end

lib/pleroma/web/activity_pub/utils.ex

@@ -543,14 +543,10 @@ def fetch_latest_undo(%User{ap_id: ap_id}) do
   end
 
   def get_latest_reaction(internal_activity_id, %{ap_id: ap_id}, emoji) do
+    IO.inspect(emoji)
     %{data: %{"object" => object_ap_id}} = Activity.get_by_id(internal_activity_id)
 
-    emoji =
-      if String.starts_with?(emoji, ":") do
-        emoji
-      else
-        ":#{emoji}:"
-      end
+    emoji = Pleroma.Emoji.maybe_quote(emoji)
 
     "EmojiReact"
     |> Activity.Queries.by_type()