policy: Bucket policies
In zhangxing-love/QingStorRSDK_0.1: Qingstor Client Package

Get/Put/Delete the bucket access policy for a bucket.

get_bucket_policy(bucket, ...)

put_bucket_policy(bucket, policy, ...)

delete_bucket_policy(bucket, ...)

`bucket`	Character string with the name of the bucket.
`...`	Additional arguments passed to `QingHTTP`.
`policy`	A character string containing a bucket policy.

For get_policy: A character string containing the JSON representation of the policy, if one has been set. For delete_policy and put_policy: TRUE if successful, FALSE otherwise. An qingstor_error object may be returned if the request failed.