Adding a sample CWS license server client written for Python App Engine.

chrome/common/extensions/docs/examples/apps/hello-python/oauth2/clients/smtp.py

Index: chrome/common/extensions/docs/examples/apps/hello-python/oauth2/clients/smtp.py
diff --git a/chrome/common/extensions/docs/examples/apps/hello-python/oauth2/clients/smtp.py b/chrome/common/extensions/docs/examples/apps/hello-python/oauth2/clients/smtp.py
new file mode 100644
index 0000000000000000000000000000000000000000..3e7bf0b0bc22b7570daea35ebf073fbddad47976
--- /dev/null
+++ b/chrome/common/extensions/docs/examples/apps/hello-python/oauth2/clients/smtp.py
@@ -0,0 +1,41 @@
+"""
+The MIT License
+
+Copyright (c) 2007-2010 Leah Culver, Joe Stump, Mark Paschal, Vic Fryzel
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+"""
+
+import oauth2
+import smtplib
+import base64
+
+
+class SMTP(smtplib.SMTP):
+    """SMTP wrapper for smtplib.SMTP that implements XOAUTH."""
+
+    def authenticate(self, url, consumer, token):
+        if consumer is not None and not isinstance(consumer, oauth2.Consumer):
+            raise ValueError("Invalid consumer.")
+
+        if token is not None and not isinstance(token, oauth2.Token):
+            raise ValueError("Invalid token.")
+
+        self.docmd('AUTH', 'XOAUTH %s' % \
+            base64.b64encode(oauth2.build_xoauth_string(url, consumer, token)))