Introduce activity filters

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

lib/graphql/resolvers/activity.ex

@@ -13,13 +13,19 @@ defmodule Mobilizon.GraphQL.Resolvers.Activity do
 
   require Logger
 
-  def group_activity(%Actor{type: :Group, id: group_id}, %{page: page, limit: limit}, %{
+  def group_activity(%Actor{type: :Group, id: group_id}, %{page: page, limit: limit} = args, %{
         context: %{current_user: %User{role: role} = user}
       }) do
     with {:actor, %Actor{id: actor_id} = _actor} <- {:actor, Users.get_actor_for_user(user)},
          {:member, true} <- {:member, Actors.is_member?(actor_id, group_id) or is_moderator(role)} do
       %Page{total: total, elements: elements} =
-        Activities.list_group_activities_for_member(group_id, actor_id, [], page, limit)
+        Activities.list_group_activities_for_member(
+          group_id,
+          actor_id,
+          [type: Map.get(args, :type), author: Map.get(args, :author)],
+          page,
+          limit
+        )
 
       elements =
         Enum.map(elements, fn %Activity{} = activity ->