html: add utility function to extract first URL from an object and cache the result

diff --git a/lib/pleroma/html.ex b/lib/pleroma/html.ex
index f5c6e5033fb572b0f02e717101dceafbd3c394c9..fb602d6b6186335f1b4174f59fd6e70de9036648 100644 (file)
--- a/lib/pleroma/html.ex
+++ b/lib/pleroma/html.ex
@@ -58,6 +58,20 @@ defmodule Pleroma.HTML do
       "#{signature}#{to_string(scrubber)}"
     end)
   end
+
+  def extract_first_external_url(object, content) do
+    key = "URL|#{object.id}"
+
+    Cachex.fetch!(:scrubber_cache, key, fn _key ->
+      result =
+        content
+        |> Floki.filter_out("a.mention")
+        |> Floki.attribute("a", "href")
+        |> Enum.at(0)
+
+      {:commit, result}
+    end)
+  end
 end
 
 defmodule Pleroma.HTML.Scrubber.TwitterText do