1 files changed, 15 insertions, 1 deletions
diff --git a/lib/pleroma/web/rich_media/helpers.ex b/lib/pleroma/web/rich_media/helpers.ex
index abb1cf7f2..92c61ff51 100644
--- a/lib/pleroma/web/rich_media/helpers.ex
+++ b/lib/pleroma/web/rich_media/helpers.ex
@@ -4,14 +4,28 @@
 
 defmodule Pleroma.Web.RichMedia.Helpers do
   alias Pleroma.Activity
-  alias Pleroma.Object
   alias Pleroma.HTML
+  alias Pleroma.Object
   alias Pleroma.Web.RichMedia.Parser
 
+  defp validate_page_url(page_url) when is_binary(page_url) do
+    if AutoLinker.Parser.is_url?(page_url, true) do
+      URI.parse(page_url) |> validate_page_url
+    else
+      :error
+    end
+  end
+
+  defp validate_page_url(%URI{authority: nil}), do: :error
+  defp validate_page_url(%URI{scheme: nil}), do: :error
+  defp validate_page_url(%URI{}), do: :ok
+  defp validate_page_url(_), do: :error
+
   def fetch_data_for_activity(%Activity{} = activity) do
     with true <- Pleroma.Config.get([:rich_media, :enabled]),
          %Object{} = object <- Object.normalize(activity.data["object"]),
          {:ok, page_url} <- HTML.extract_first_external_url(object, object.data["content"]),
+         :ok <- validate_page_url(page_url),
          {:ok, rich_media} <- Parser.parse(page_url) do
       %{page_url: page_url, rich_media: rich_media}
     else