Make MIME boundary harder to accidentally match.

third_party/upload.py

 #!/usr/bin/env python
 # coding: utf-8
 #
 # Copyright 2007 Google Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #     http://www.apache.org/licenses/LICENSE-2.0
@@ skipping 954 matching lines @@
   Args:
     fields: A sequence of (name, value) elements for regular form fields.
     files: A sequence of (name, filename, value) elements for data to be
            uploaded as files.
   Returns:
     (content_type, body) ready for httplib.HTTP instance.
 
   Source:
     http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/146306
   """
-  BOUNDARY = '-M-A-G-I-C---B-O-U-N-D-A-R-Y-'
+  BOUNDARY = '-M-A-G-I-C---B-O-U-N-D-A-R-Y-%s-' % sum(hash(f) for f in files)
   CRLF = '\r\n'
   lines = []
   for (key, value) in fields:
     lines.append('--' + BOUNDARY)
     lines.append('Content-Disposition: form-data; name="%s"' % key)
     lines.append('')
     if isinstance(value, unicode):
       value = value.encode('utf-8')
     lines.append(value)
   for (key, filename, value) in files:
@@ skipping 1719 matching lines @@
     os.environ['LC_ALL'] = 'C'
     RealMain(sys.argv)
   except KeyboardInterrupt:
     print
     StatusUpdate("Interrupted.")
     sys.exit(1)
 
 
 if __name__ == "__main__":
   main()