auth.py 文件源码

def mangle_path_and_params(self, req):
        """
        Returns a copy of the request object with fixed ``auth_path/params``
        attributes from the original.
        """
        modified_req = copy.copy(req)

        # Unlike the most other services, in S3, ``req.params`` isn't the only
        # source of query string parameters.
        # Because of the ``query_args``, we may already have a query string
        # **ON** the ``path/auth_path``.
        # Rip them apart, so the ``auth_path/params`` can be signed
        # appropriately.
        parsed_path = urllib.parse.urlparse(modified_req.auth_path)
        modified_req.auth_path = parsed_path.path

        if modified_req.params is None:
            modified_req.params = {}
        else:
            # To keep the original request object untouched. We must make
            # a copy of the params dictionary. Because the copy of the
            # original request directly refers to the params dictionary
            # of the original request.
            copy_params = req.params.copy()
            modified_req.params = copy_params

        raw_qs = parsed_path.query
        existing_qs = urllib.parse.parse_qs(
            raw_qs,
            keep_blank_values=True
        )

        # ``parse_qs`` will return lists. Don't do that unless there's a real,
        # live list provided.
        for key, value in existing_qs.items():
            if isinstance(value, (list, tuple)):
                if len(value) == 1:
                    existing_qs[key] = value[0]

        modified_req.params.update(existing_qs)
        return modified_req