def register_user(request, access_token):
btid = request.args.get('btid')
if btid:
users = User.get_collection()
user = User.find_one({'btid': btid})
if user:
user['access_key'] = access_token
user['uids'][request.args['service']] = request.args['uid']
User.save(user)
user = User(**user)
else:
user = User(btid, access_token,
uids = {request.args['service']: request.args['uid']},
confirmed = True)
user_id = User.get_collection().insert(dict(user))
user._id = user_id
session[TOKENS_KEY] = user['access_key']
return user
return None
