signers.py 文件源码

def generate_presigned_url(self, ClientMethod, Params=None, ExpiresIn=3600,
                           HttpMethod=None):
    """Generate a presigned url given a client, its method, and arguments

    :type ClientMethod: string
    :param ClientMethod: The client method to presign for

    :type Params: dict
    :param Params: The parameters normally passed to
        ``ClientMethod``.

    :type ExpiresIn: int
    :param ExpiresIn: The number of seconds the presigned url is valid
        for. By default it expires in an hour (3600 seconds)

    :type HttpMethod: string
    :param HttpMethod: The http method to use on the generated url. By
        default, the http method is whatever is used in the method's model.

    :returns: The presigned url
    """
    client_method = ClientMethod
    params = Params
    expires_in = ExpiresIn
    http_method = HttpMethod

    request_signer = self._request_signer
    serializer = self._serializer

    try:
        operation_name = self._PY_TO_OP_NAME[client_method]
    except KeyError:
        raise UnknownClientMethodError(method_name=client_method)

    operation_model = self.meta.service_model.operation_model(
        operation_name)

    # Create a request dict based on the params to serialize.
    request_dict = serializer.serialize_to_request(
        params, operation_model)

    # Switch out the http method if user specified it.
    if http_method is not None:
        request_dict['method'] = http_method

    # Prepare the request dict by including the client's endpoint url.
    prepare_request_dict(
        request_dict, endpoint_url=self.meta.endpoint_url)

    # Generate the presigned url.
    return request_signer.generate_presigned_url(
        request_dict=request_dict, expires_in=expires_in,
        operation_name=operation_name)