[utils] accept only supported protocols in url_or_none

test/test_utils.py

@@ -554,6 +554,11 @@ class TestUtil(unittest.TestCase):
         self.assertEqual(url_or_none('http$://foo.de'), None)
         self.assertEqual(url_or_none('http://foo.de'), 'http://foo.de')
         self.assertEqual(url_or_none('//foo.de'), '//foo.de')
+        self.assertEqual(url_or_none('s3://foo.de'), None)
+        self.assertEqual(url_or_none('rtmpte://foo.de'), 'rtmpte://foo.de')
+        self.assertEqual(url_or_none('mms://foo.de'), 'mms://foo.de')
+        self.assertEqual(url_or_none('rtspu://foo.de'), 'rtspu://foo.de')
+        self.assertEqual(url_or_none('ftps://foo.de'), 'ftps://foo.de')
 
     def test_parse_age_limit(self):
         self.assertEqual(parse_age_limit(None), None)

youtube_dl/utils.py

@@ -3640,7 +3640,7 @@ def url_or_none(url):
     if not url or not isinstance(url, compat_str):
         return None
     url = url.strip()
-    return url if re.match(r'^(?:[a-zA-Z][\da-zA-Z.+-]*:)?//', url) else None
+    return url if re.match(r'^(?:(?:https?|rt(?:m(?:pt?[es]?|fp)|sp[su]?)|mms|ftps?):)?//', url) else None
 
 
 def parse_duration(s):