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"""Useful mixins for Challenge and Resource objects"""
class VersionedLEACMEMixin:
"""This mixin stores the version of Let's Encrypt's endpoint being used."""
@property
def le_acme_version(self):
"""Define the version of ACME protocol to use"""
return getattr(self, '_le_acme_version', 1)
@le_acme_version.setter
def le_acme_version(self, version):
# We need to use object.__setattr__ to not depend on the specific implementation of
# __setattr__ in current class (eg. jose.TypedJSONObjectWithFields raises AttributeError
# for any attempt to set an attribute to make objects immutable).
object.__setattr__(self, '_le_acme_version', version)
def __setattr__(self, key, value):
if key == 'le_acme_version':
# Required for @property to operate properly. See comment above.
object.__setattr__(self, key, value)
else:
super(VersionedLEACMEMixin, self).__setattr__(key, value) # pragma: no cover
class ResourceMixin(VersionedLEACMEMixin):
"""
This mixin generates a RFC8555 compliant JWS payload
by removing the `resource` field if needed (eg. ACME v2 protocol).
"""
def to_partial_json(self):
"""See josepy.JSONDeserializable.to_partial_json()"""
return _safe_jobj_compliance(super(ResourceMixin, self),
'to_partial_json', 'resource')
def fields_to_partial_json(self):
"""See josepy.JSONObjectWithFields.fields_to_partial_json()"""
return _safe_jobj_compliance(super(ResourceMixin, self),
'fields_to_partial_json', 'resource')
class TypeMixin(VersionedLEACMEMixin):
"""
This mixin allows generation of a RFC8555 compliant JWS payload
by removing the `type` field if needed (eg. ACME v2 protocol).
"""
def to_partial_json(self):
"""See josepy.JSONDeserializable.to_partial_json()"""
return _safe_jobj_compliance(super(TypeMixin, self),
'to_partial_json', 'type')
def fields_to_partial_json(self):
"""See josepy.JSONObjectWithFields.fields_to_partial_json()"""
return _safe_jobj_compliance(super(TypeMixin, self),
'fields_to_partial_json', 'type')
def _safe_jobj_compliance(instance, jobj_method, uncompliant_field):
if hasattr(instance, jobj_method):
jobj = getattr(instance, jobj_method)()
if instance.le_acme_version == 2:
jobj.pop(uncompliant_field, None)
return jobj
raise AttributeError('Method {0}() is not implemented.'.format(jobj_method)) # pragma: no cover