diff --git a/apiclient/ext/authtools.py b/apiclient/ext/authtools.py
new file mode 100644
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+++ b/apiclient/ext/authtools.py
@@ -0,0 +1,140 @@
+# Copyright (C) 2010 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
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Command-line tools for authenticating via OAuth 1.0
+
+Do the OAuth 1.0 Three Legged Dance for
+a command line application. Stores the generated
+credentials in a common file that is used by
+other example apps in the same directory.
+"""
+
+__author__ = 'jcgregorio@google.com (Joe Gregorio)'
+__all__ = ["run"]
+
+import BaseHTTPServer
+import logging
+import pickle
+import socket
+import sys
+
+from optparse import OptionParser
+from apiclient.oauth import RequestError
+
+try:
+    from urlparse import parse_qsl
+except ImportError:
+    from cgi import parse_qsl
+
+
+class ClientRedirectServer(BaseHTTPServer.HTTPServer):
+  """A server to handle OAuth 1.0 redirects back to localhost.
+
+  Waits for a single request and parses the query parameters
+  into query_params and then stops serving.
+  """
+  query_params = {}
+
+
+class ClientRedirectHandler(BaseHTTPServer.BaseHTTPRequestHandler):
+  """A handler for OAuth 2.0 redirects back to localhost.
+
+  Waits for a single request and parses the query parameters
+  into the servers query_params and then stops serving.
+  """
+
+  def do_GET(s):
+    """Handle a GET request
+
+    Parses the query parameters and prints a message
+    if the flow has completed. Note that we can't detect
+    if an error occurred.
+    """
+    s.send_response(200)
+    s.send_header("Content-type", "text/html")
+    s.end_headers()
+    query = s.path.split('?', 1)[-1]
+    query = dict(parse_qsl(query))
+    s.server.query_params = query
+    s.wfile.write("<html><head><title>Authentication Status</title></head>")
+    s.wfile.write("<body><p>The authentication flow has completed.</p>")
+    s.wfile.write("</body></html>")
+
+  def log_message(self, format, *args):
+    """Do not log messages to stdout while running as command line program."""
+    pass
+
+
+def run(flow, filename):
+  """Core code for a command-line application.
+  """
+  parser = OptionParser()
+  parser.add_option("-f", "--file", dest="filename",
+      default=filename, help="write credentials to FILE", metavar="FILE")
+  parser.add_option("-p", "--no_local_web_server", dest="localhost",
+      action="store_false",
+      default=True,
+      help="Do not run a web server on localhost to handle redirect URIs")
+  parser.add_option("-w", "--local_web_server", dest="localhost",
+      action="store_true",
+      default=True,
+      help="Run a web server on localhost to handle redirect URIs")
+
+  (options, args) = parser.parse_args()
+
+  host_name = 'localhost'
+  port_numbers = [8080, 8090]
+  if options.localhost:
+    server_class = BaseHTTPServer.HTTPServer
+    try:
+      port_number = port_numbers[0]
+      httpd = server_class((host_name, port_number), ClientRedirectHandler)
+    except socket.error:
+      port_number = port_numbers[1]
+      try:
+        httpd = server_class((host_name, port_number), ClientRedirectHandler)
+      except socket.error:
+        options.localhost = False
+
+  if options.localhost:
+    oauth_callback = 'http://%s:%s/' % (host_name, port_number)
+  else:
+    oauth_callback = 'oob'
+  authorize_url = flow.step1_get_authorize_url(oauth_callback)
+
+  print 'Go to the following link in your browser:'
+  print authorize_url
+  print
+
+  if options.localhost:
+    httpd.handle_request()
+    if 'error' in httpd.query_params:
+      sys.exit('Authentication request was rejected.')
+    if 'oauth_verifier' in httpd.query_params:
+      code = httpd.query_params['oauth_verifier']
+  else:
+    accepted = 'n'
+    while accepted.lower() == 'n':
+      accepted = raw_input('Have you authorized me? (y/n) ')
+    code = raw_input('What is the verification code? ').strip()
+
+  try:
+    credentials = flow.step2_exchange(code)
+  except RequestError:
+    sys.exit('The authentication has failed.')
+
+  f = open(filename, 'w')
+  f.write(pickle.dumps(credentials))
+  f.close()
+  print "You have successfully authenticated."