resources.py 文件源码

 复制代码def __init__(self, policies=None):
        if policies is None:
            policies = self.policies

        if not isinstance(policies, compat.Mapping):
            raise ValueError("policies must be a mapping of bytes"
                             " method names to sequence of policies.")

        allowedMethods = getattr(self, 'allowedMethods', None)
        if not allowedMethods:
            raise ValueError("instance must have allowedMethods")

        required = set(allowedMethods)
        available = six.viewkeys(policies)
        missing = required - available

        if missing:
            raise ValueError("missing methods: {}".format(missing))

        # adapt any policies we have to our resource
        self._actingPolicies = {method: tuple(p.forResource(self)
                                              for p in methodPolicies)
                                for method, methodPolicies in policies.items()}