Allow setting custom user-agent for fetching rich media content

Signed-off-by: nicole mikołajczyk <git@mkljczk.pl>

changelog.d/rich-media-user-agent.add

@@ -0,0 +1 @@
+Allow setting custom user-agent for fetching rich media content

config/description.exs

@@ -2131,6 +2131,11 @@ config :pleroma, :config_description, [
         description:
           "Amount of milliseconds after which the HTTP request is forcibly terminated.",
         suggestions: [5_000]
+      },
+      %{
+        key: :user_agent,
+        type: :string,
+        description: "Custom User-Agent header to be used when fetching rich media content."
       }
     ]
   },

lib/pleroma/web/rich_media/helpers.ex

@@ -126,6 +126,11 @@ defmodule Pleroma.Web.RichMedia.Helpers do
   end
 
   defp req_headers do
-    [{"user-agent", Pleroma.Application.user_agent() <> "; Bot"}]
+    user_agent = Config.get([:rich_media, :user_agent], :default)
+
+    case user_agent do
+      :default -> [{"user-agent", Pleroma.Application.user_agent() <> "; Bot"}]
+      custom -> [{"user-agent", custom}]
+    end
   end
 end