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"""Useful mixins for Challenge and Resource objects""" class VersionedLEACMEMixin(object): """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