Revert the X-GOOGLE-TOKEN mech to not perform HTTP requests.

Added new example for how to retrieve a Google token, following
the best case, non-browser, workflow. Other thirdparty auth
mechs (Facebook, MSN) follow a similar pattern of using an
access token.

sleekxmpp/thirdparty/suelta/mechanisms/google_token.py

@@ -1,72 +1,16 @@
-import sys
-import logging
-try:
-    from httplib import HTTPSConnection
-    from urllib import urlencode
-except ImportError:
-    from urllib.parse import urlencode
-    from http.client import HTTPSConnection
-
 from sleekxmpp.thirdparty.suelta.util import bytes
 from sleekxmpp.thirdparty.suelta.sasl import Mechanism, register_mechanism
 from sleekxmpp.thirdparty.suelta.exceptions import SASLError, SASLCancelled
 
 
-log = logging.getLogger(__name__)
-
 
 class X_GOOGLE_TOKEN(Mechanism):
 
     def __init__(self, sasl, name):
         super(X_GOOGLE_TOKEN, self).__init__(sasl, name)
-        self.check_values(['email', 'password', 'access_token'])
+        self.check_values(['email', 'access_token'])
 
     def process(self, challenge=None):
-        if not self.values.get('access_token', False):
-            log.debug("SASL: Requesting auth token from Google")
-            try:
-                conn = HTTPSConnection('www.google.com')
-            except:
-                raise SASLError(self.sasl, 'Could not connect to Google')
-            params = urlencode({
-                'accountType': 'GOOGLE',
-                'service': 'mail',
-                'Email': self.values['email'],
-                'Passwd': self.values['password']
-            })
-            headers = {
-                'Content-Type': 'application/x-www-form-urlencoded' 
-            }
-            try:
-                conn.request('POST', '/accounts/ClientLogin', params, headers)
-                resp = conn.getresponse().read()
-                data = {}
-                for line in resp.split():
-                    k, v = line.split(b'=', 1)
-                    data[k] = v
-            except Exception as e:
-                raise e
-                #raise SASLError(self.sasl, 'Could not retrieve login data')
-
-            if b'SID' not in data:
-                raise SASLError(self.sasl, 'Required data not found')
-
-            params = urlencode({
-                'SID': data[b'SID'],
-                'LSID': data[b'LSID'],
-                'service': 'mail'
-            })
-            try:
-                conn.request('POST', '/accounts/IssueAuthToken', params, headers)
-                resp = conn.getresponse()
-                data = resp.read().split()
-            except:
-                raise SASLError(self.sasl, 'Could not retrieve auth data')
-            if not data:
-                raise SASLError(self.sasl, 'Could not retrieve token')
-
-            self.values['access_token'] = data[0]
- 
         email = bytes(self.values['email'])
         token = bytes(self.values['access_token'])
         return b'\x00' + email + b'\x00' + token