def lookup_token(self, token_type, token_field):
"""
:param token_type: type of token to lookup
:param token_field: token to look up
:note: token_type should always be 'access' as only such tokens are
stored in database
:returns: OAuthToken object
"""
assert token_type == 'access'
try:
token = Token.objects.get(token=token_field)
# Piston expects OAuth tokens to have 'consumer' and 'user' atts.
# (see piston.authentication.OAuthAuthentication.is_authenticated)
oauthtoken = OAuthToken(token.token, token.token_secret)
oauthtoken.consumer = token.consumer
oauthtoken.user = token.consumer.user
return oauthtoken
except Token.DoesNotExist:
return None
