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from __future__ import unicode_literals
import binascii
from six import iteritems
from pymacaroons.field_encryptors import SecretBoxEncryptor
from .first_party import (
FirstPartyCaveatDelegate, FirstPartyCaveatVerifierDelegate
)
class EncryptedFirstPartyCaveatDelegate(FirstPartyCaveatDelegate):
def __init__(self, field_encryptor=None, *args, **kwargs):
self.field_encryptor = field_encryptor or SecretBoxEncryptor()
super(EncryptedFirstPartyCaveatDelegate, self).__init__(
*args, **kwargs
)
def add_first_party_caveat(self, macaroon, predicate, **kwargs):
if kwargs.get('encrypted'):
predicate = self.field_encryptor.encrypt(
binascii.unhexlify(macaroon.signature_bytes),
predicate
)
return super(EncryptedFirstPartyCaveatDelegate,
self).add_first_party_caveat(macaroon,
predicate,
**kwargs)
class EncryptedFirstPartyCaveatVerifierDelegate(
FirstPartyCaveatVerifierDelegate):
def __init__(self, field_encryptors=None, *args, **kwargs):
secret_box_encryptor = SecretBoxEncryptor()
self.field_encryptors = dict(
(f.signifier, f) for f in field_encryptors
) if field_encryptors else {
secret_box_encryptor.signifier: secret_box_encryptor
}
super(EncryptedFirstPartyCaveatVerifierDelegate, self).__init__(
*args, **kwargs
)
def verify_first_party_caveat(self, verifier, caveat, signature):
predicate = caveat.caveat_id_bytes
for signifier, encryptor in iteritems(self.field_encryptors):
if predicate.startswith(signifier):
predicate = encryptor.decrypt(
signature,
predicate
)
caveat_met = sum(callback(predicate)
for callback in verifier.callbacks)
return caveat_met
Private