def getAssociation(self, server_url, handle=None):
"""Return stored assocition"""
oid_associations = UserSocialAuth.get_oid_associations(server_url,
handle)
associations = [association
for assoc_id, association in oid_associations
if association.getExpiresIn() > 0]
expired = [assoc_id for assoc_id, association in oid_associations
if association.getExpiresIn() == 0]
if expired: # clear expired associations
UserSocialAuth.delete_associations(expired)
if associations: # return most recet association
return associations[0]
