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"""
Keyring Chainer - iterates over other viable backends to
discover passwords in each.
"""
from .. import backend
from ..util import properties
from . import fail
class ChainerBackend(backend.KeyringBackend):
"""
>>> ChainerBackend()
<keyring.backends.chainer.ChainerBackend object at ...>
"""
# override viability as 'priority' cannot be determined
# until other backends have been constructed
viable = True
@properties.ClassProperty
@classmethod
def priority(cls):
"""
If there are backends to chain, high priority
Otherwise very low priority since our operation when empty
is the same as null.
"""
return 10 if len(cls.backends) > 1 else (fail.Keyring.priority - 1)
@properties.ClassProperty
@classmethod
def backends(cls):
"""
Discover all keyrings for chaining.
"""
def allow(keyring):
limit = backend._limit or bool
return (
not isinstance(keyring, ChainerBackend)
and limit(keyring)
and keyring.priority > 0
)
allowed = filter(allow, backend.get_all_keyring())
return sorted(allowed, key=backend.by_priority, reverse=True)
def get_password(self, service, username):
for keyring in self.backends:
password = keyring.get_password(service, username)
if password is not None:
return password
def set_password(self, service, username, password):
for keyring in self.backends:
try:
return keyring.set_password(service, username, password)
except NotImplementedError:
pass
def delete_password(self, service, username):
for keyring in self.backends:
try:
return keyring.delete_password(service, username)
except NotImplementedError:
pass
def get_credential(self, service, username):
for keyring in self.backends:
credential = keyring.get_credential(service, username)
if credential is not None:
return credential