def decryption_materials()

in src/dynamodb_encryption_sdk/material_providers/most_recent.py [0:0]
20 lines of code
6 McCabe index (conditional complexity)

    def decryption_materials(self, encryption_context):
        # type: (EncryptionContext) -> CryptographicMaterials
        """Return decryption materials.

        :param EncryptionContext encryption_context: Encryption context for request
        :raises AttributeError: if no decryption materials are available
        """
        provider = None

        version = self._provider_store.version_from_material_description(encryption_context.material_description)

        ttl_action = self._ttl_action(version, _DECRYPT_ACTION)

        if ttl_action is TtlActions.EXPIRED:
            self._cache.evict(self._version)

        _LOGGER.debug('TTL Action "%s" when getting decryption materials', ttl_action.name)
        if ttl_action is TtlActions.LIVE:
            try:
                _LOGGER.debug("Looking in cache for encryption materials provider version %d", version)
                _, provider = self._cache.get(version)
            except KeyError:
                _LOGGER.debug("Decryption materials provider not found in cache")

        if provider is None:
            try:
                provider = self._get_provider_with_grace_period(version, ttl_action)
            except InvalidVersionError:
                _LOGGER.exception("Unable to get decryption materials from provider store.")
                raise AttributeError("No decryption materials available")

        return provider.decryption_materials(encryption_context)