Extract authorization policy for viewing statuses (#3150)

app/controllers/concerns/authorization.rb

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+module Authorization
+  extend ActiveSupport::Concern
+  include Pundit
+
+  def pundit_user
+    current_account
+  end
+
+  def authorize(*)
+    super
+  rescue Pundit::NotAuthorizedError
+    raise Mastodon::NotPermittedError
+  end
+
+  def authorize_with(user, record, query)
+    Pundit.authorize(user, record, query)
+  rescue Pundit::NotAuthorizedError
+    raise Mastodon::NotPermittedError
+  end
+end