def cleanupNonces(self):
"""Remove expired nonces from the store.
Discards any nonce from storage that is old enough that its
timestamp would not pass L{useNonce}.
This method is not called in the normal operation of the
library. It provides a way for store admins to keep
their storage from filling up with expired data.
@return: the number of nonces expired.
@returntype: int
"""
query = UsedNonce.gql('WHERE timestamp < :1', self._expiration_datetime())
return self._cleanup_batch(query)
def useNonce(self, server_url, timestamp, salt):
"""Called when using a nonce.
This method should return C{True} if the nonce has not been
used before, and store it for a while to make sure nobody
tries to use the same value again. If the nonce has already
been used or the timestamp is not current, return C{False}.
You may use L{openid.store.nonce.SKEW} for your timestamp window.
@change: In earlier versions, round-trip nonces were used and
a nonce was only valid if it had been previously stored
with C{storeNonce}. Version 2.0 uses one-way nonces,
requiring a different implementation here that does not
depend on a C{storeNonce} call. (C{storeNonce} is no
longer part of the interface.)
@param server_url: The URL of the server from which the nonce
originated.
@type server_url: C{str}
@param timestamp: The time that the nonce was created (to the
nearest second), in seconds since January 1 1970 UTC.
@type timestamp: C{int}
@param salt: A random string that makes two nonces from the
same server issued during the same second unique.
@type salt: str
@return: Whether or not the nonce was valid.
@rtype: C{bool}
"""
query = UsedNonce.gql(
'WHERE server_url = :1 AND salt = :2 AND timestamp >= :3',
server_url, salt, self._expiration_datetime())
return query.fetch(1) == []