From 674c869af485013f6121f4ec7dc6307ada3ad3a4 Mon Sep 17 00:00:00 2001
From: Philipp Hagemeister <phihag@phihag.de>
Date: Thu, 4 Sep 2014 04:47:56 +0200
Subject: [PATCH] [cache] Allow dots in keys (Fixes #3674)

---
 youtube_dl/cache.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/youtube_dl/cache.py b/youtube_dl/cache.py
index 6cae53d221..79ff09f789 100644
--- a/youtube_dl/cache.py
+++ b/youtube_dl/cache.py
@@ -25,8 +25,9 @@ class Cache(object):
         return os.path.expanduser(res)
 
     def _get_cache_fn(self, section, key, dtype):
-        assert re.match(r'^[a-zA-Z0-9_-]+$', section)
-        assert re.match(r'^[a-zA-Z0-9_-]+$', key)
+        assert re.match(r'^[a-zA-Z0-9_.-]+$', section), \
+            'invalid section %r' % section
+        assert re.match(r'^[a-zA-Z0-9_.-]+$', key), 'invalid key %r' % key
         return os.path.join(
             self._get_root_dir(), section, '%s.%s' % (key, dtype))