Docserver: refactor Servlet, ObjectStore, and ServerInstance architecture to

chrome/common/extensions/docs/server2/docs_server_utils.py

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+from base64 import b64encode
+from hashlib import sha1
 import os
 
 def FormatKey(key):
-  """Normalize a key by making sure it has a .html extension, and convert any
+  '''Normalize a key by making sure it has a .html extension, and convert any
   '.'s to '_'s.
-  """
+  '''
   if key.endswith('.html'):
     key = key[:-len('.html')]
   safe_key = key.replace('.', '_')
   return '%s.html' % safe_key
 
 def SanitizeAPIName(name):
-  """Sanitizes API filenames that are in subdirectories.
-  """
+  '''Sanitizes API filenames that are in subdirectories.
+  '''
   filename = os.path.splitext(name)[0].replace(os.sep, '_')
   if 'experimental' in filename:
     filename = 'experimental_' + filename.replace('experimental_', '')
   return filename
+
+def StringIdentity(string):
+  '''Creates a small hash of a string.
+  '''
+  return b64encode(sha1(string).digest())[:8]