MinIO: ObjectHashMismatchError when trying to upload object

## Summary

The MinIO provider raises an `ObjectHashMismatchError` when trying to upload an object, for no clear reason
100% reproducible, code to repro the bug is provided

## Detailed Information

libcloud: latest stable, 3.3.1
Python: 3.8.10
OS: Ubuntu 20.04

Here you can find a repo to repro the bug, using `pytest` (Actually there are 2 bugs to report):
https://github.com/Wenzel/libcloud_bug

~~~python3
$ pytest -k test_demo_ObjectHashMismatchError_with_pyfakefs
clean_minio_db = , fs =

def test_demo_ObjectHashMismatchError_with_pyfakefs(clean_minio_db, fs):
# create test file
test_file = "/file1.txt"
test_file_data = b"hello"
with open(test_file, "wb") as f:
f.write(test_file_data)
# create container
driver = clean_minio_db
container = driver.create_container('test')
# test
> driver.upload_object(str(test_file), container, 'test_file')

/home/wenzel/Projets/libcloud_bug/tests/test_demo_bug.py:13:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
/home/wenzel/.cache/pypoetry/virtualenvs/libcloud-bug-IT-EyGKG-py3.8/lib/python3.8/site-packages/libcloud/storage/drivers/s3.py:545: in upload_object
return self._put_object(container=container, object_name=object_name,
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = , container = , object_name = 'test_file', method = 'PUT'
query_args = None, extra = {}, file_path = '/file1.txt', stream = None, verify_hash = True, storage_class = None, headers = {'connection': 'close', 'content-type': 'text/plain; charset=utf-8'}

def _put_object(self, container, object_name, method='PUT',
query_args=None, extra=None, file_path=None,
stream=None, verify_hash=True, storage_class=None,
headers=None):
headers = headers or {}
extra = extra or {}

headers.update(self._to_storage_class_headers(storage_class))

content_type = extra.get('content_type', None)
meta_data = extra.get('meta_data', None)
acl = extra.get('acl', None)

if meta_data:
for key, value in list(meta_data.items()):
key = self.http_vendor_prefix + '-meta-%s' % (key)
headers[key] = value

if acl:
headers[self.http_vendor_prefix + '-acl'] = acl

request_path = self._get_object_path(container, object_name)

if query_args:
request_path = '?'.join((request_path, query_args))

result_dict = self._upload_object(
object_name=object_name, content_type=content_type,
request_path=request_path, request_method=method,
headers=headers, file_path=file_path, stream=stream)

response = result_dict['response']
bytes_transferred = result_dict['bytes_transferred']
headers = response.headers
response = response
server_hash = headers.get('etag', '').replace('"', '')
server_side_encryption = headers.get('x-amz-server-side-encryption',
None)
aws_kms_encryption = (server_side_encryption == 'aws:kms')
hash_matches = (result_dict['data_hash'] == server_hash)

# NOTE: If AWS KMS server side encryption is enabled, ETag won't
# contain object MD5 digest so we skip the checksum check
# See https://docs.aws.amazon.com/AmazonS3/latest/API
# /RESTCommonResponseHeaders.html
# and https://github.com/apache/libcloud/issues/1401
# for details
if verify_hash and not aws_kms_encryption and not hash_matches:
> raise ObjectHashMismatchError(
value='MD5 hash {0} checksum does not match {1}'.format(
server_hash, result_dict['data_hash']),
E libcloud.storage.types.ObjectHashMismatchError: , value=MD5 hash checksum does not match 5d41402abc4b2a76b9719d911017c592, object = test_file>

/home/wenzel/.cache/pypoetry/virtualenvs/libcloud-bug-IT-EyGKG-py3.8/lib/python3.8/site-packages/libcloud/storage/drivers/s3.py:922: ObjectHashMismatchError
------------------------------------------------------------------------------------------- Captured stdout setup -------------------------------------------------------------------------------------------
db2dfd078b96e1b0932dc354926aadb77adba2d8c19b8ccc875e7fe5163e8f46
----------------------------------------------------------------------------------------- Captured stdout teardown ------------------------------------------------------------------------------------------
libcloud_bug_objectmistmatch_miniodb
========================================================================================== short test summary info ==========================================================================================
FAILED tests/test_demo_bug.py::test_demo_ObjectHashMismatchError_with_pyfakefs - libcloud.storage.types.ObjectHashMismatchError:

Beginne mit dem MinIO-Provider und dem in libcloud/storage/drivers/s3.py gezeigten S3-Upload-Pfad, insbesondere _put_object und dem Hash-Vergleich um Zeile 922. Führe die verknüpfte pytest-Reproduktion test_demo_ObjectHashMismatchError_with_pyfakefs aus und vergleiche die Header der Upload-Antwort mit dem berechneten Hash. Fertig ist die Aufgabe, wenn der reproduzierbare Upload ohne einen inkorrekten ObjectHashMismatchError erfolgreich ist und die relevanten Tests bestehen.

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