fix missing md5

[teacup418]

fix problem "An error occurred (MissingContentMD5) when calling the PutObjectRetention operation: Missing required header for this request: Content-Md5."

[teacup418]

Directly running it will result in an error. After gathering information, it was found that MD5 needs to be added.

[teacup418]

calculate by this code:

import hashlib
import base64

def get_content_md5(data):
    digest = hashlib.md5(data.encode('utf-8')).digest()
    return base64.b64encode(digest)

content_md5 = get_content_md5("{}")
content_md5_string = content_md5.decode('utf-8')

print(content_md5_string)

[teacup418]

Well... it seems that the base64 of md5 doesn't have much impact regardless of what value it is. The first value was told to me by AI.

[AlexeyALeonov]

This is likely related to this issue: storj/gateway-st#89

and documented there: https://storj.dev/dcs/api/s3/s3-compatibility#compatibility-with-python-sdk-and-cli