Issue 2678 - Don't consider local files and Windows registry when guessing mime types

cms/bin/test_server.py

Index: cms/bin/test_server.py
===================================================================
--- a/cms/bin/test_server.py
+++ b/cms/bin/test_server.py
@@ -46,9 +46,9 @@
   </body>
 </html>"""
 
-# Create our own instance, the default one will introduce "random" host-specific
-# behavior by parsing local config files.
-mime_types = mimetypes.MimeTypes()
+# Initilize the mimetypes modules manually for consistent behavior,
+# ignoring local files and Windows Registry.
+mimetypes.init([])

[Wladimir Palant, 2015/06/29 10:42:32]

Re-reading the source code I can see the issue - MimeTypes class actually calls
mimetypes.init() implicitly, without parameters. It merely allows specifying
*additional* file names, these won't replace the default ones however. It seems
that we cannot avoid changing global state here, and we have to accept that
things will fail badly if somebody else initializes mimetypes module before us.
That module is seriously misdesigned, maybe somebody wants to file a bug on it.

 
 def get_page(path):
   path = path.strip("/")
@@ -105,7 +105,7 @@
   if data is None:
     return show_error(start_response, "404 Not Found", uri=path)
 
-  mime = mime_types.guess_type(path)[0] or "text/html"
+  mime = mimetypes.guess_type(path)[0] or "text/html"
 
   if isinstance(data, unicode):
     data = data.encode(UNICODE_ENCODING)