[damned-lies] Allow gitlab.gnome.org in hook origin check

[Claude Paroz <claudep src gnome org>]

commit d0910e031b2dde77af591bb70b39c7871a4de8b3
Author: Claude Paroz <claude 2xlibre net>
Date:   Fri Sep 13 14:46:28 2019 +0200

    Allow gitlab.gnome.org in hook origin check

 common/utils.py | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)
---
diff --git a/common/utils.py b/common/utils.py
index 2355040b..eead3f6f 100644
--- a/common/utils.py
+++ b/common/utils.py
@@ -1,6 +1,7 @@
 import errno
 import logging
 import os
+import socket
 from subprocess import Popen, PIPE
 
 from django.conf import settings
@@ -96,8 +97,12 @@ def send_mail(subject, message, **kwargs):
 
 
 def check_gitlab_request(request):
+    from_host = socket.gethostbyaddr(request.META.get('REMOTE_ADDR'))[0]
     return (
-        request.method == 'POST' and
-        request.META.get('HTTP_X_GITLAB_EVENT') == 'Push Hook' and
-        request.META.get('HTTP_X_GITLAB_TOKEN') == settings.GITLAB_TOKEN
+        request.method == 'POST' and (
+            from_host == 'gitlab.gnome.org' or (
+                request.META.get('HTTP_X_GITLAB_EVENT') == 'Push Hook' and
+                request.META.get('HTTP_X_GITLAB_TOKEN') == settings.GITLAB_TOKEN
+            )
+        )
     )