# Type of request: This is a ...
[ ] bug report
[x] feature request

# Detailed description
As a Developer,
I want to be able to simulate BadDigest and InvalidDigest errors,
So that I can test the error handling logic

## Expected behavior
https://docs.aws.amazon.com/AmazonS3/latest/API/ErrorResponses.html
BadDigest: The Content-MD5 you specified did not match what we received.
InvalidDigest: The Content-MD5 you specified is not valid.

## Actual behavior
localstack returns InvalidDigest when MD5 does not match payload.


"""
    Synchronization decorator as described in
    http://blog.dscpl.com.au/2014/01/the-missing-synchronized-decorator.html.
    """
    def _decorator(wrapped):
        @functools.wraps(wrapped)
        def _wrapper(*args, **kwargs):
            with lock:
                return wrapped(*args, **kwargs)
        return _wrapper
    return _decorator
def is_string(s, include_unicode=True, exclude_binary=False):
    if isinstance(s, six.binary_type) and exclude_binary:
        return False
    if isinstance(s, str):
        return True
    if include_unicode and isinstance(s, six.text_type):
        return True
    return False
def is_string_or_bytes(s):
    return is_string(s) or isinstance(s, six.string_types) or isinstance(s, bytes)
def is_base64(s):
    regex = r'^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=)?$'
    return is_string(s) and re.match(regex, s)
def md5(string):
    m = hashlib.md5()
    m.update(to_bytes(string))
    return m.hexdigest()
def in_docker():