parse AWS ARN

parse_aws_arn.py

def parse_arn(arn_str: str) -> Tuple[str, str, str, Optional[str], str, Optional[List[str]]]:
    """
    https://docs.aws.amazon.com/general/latest/gr/aws-arns-and-namespaces.html
    arn:partition:service:region:account-id:resource
    arn:partition:service:region:account-id:resourcetype/resource
    arn:partition:service:region:account-id:resourcetype/resource/qualifier
    arn:partition:service:region:account-id:resourcetype/resource:qualifier
    arn:partition:service:region:account-id:resourcetype:resource
    arn:partition:service:region:account-id:resourcetype:resource:qualifier

    :return: service, region, account_id, resource_type, resource, qualifier
    """
    *_, service, region, account_id, resource_elements = arn_str.split(':', 5)

    resource_type = None
    resource = None
    qualifiers = None
    if not any(separator in resource_elements for separator in (':', '/')):
        resource = resource_elements
    elif ':' in resource_elements and '/' not in resource_elements:
        if resource_elements.count(':') == 1:
            resoruce_type, resource = resource_elements.split(':')
        elif resource_elements.count(':') >= 2:
            resource_type, resource, *qualifiers = resource_elements.split(':')
    elif ':' not in resource_elements and '/' in resource_elements:
        if resource_elements.count('/') == 1:
            resoruce_type, resource = resource_elements.split('/')
        elif resource_elements.count('/') >= 2:
            resource_type, resource, *qualifiers = resource_elements.split('/')
    elif ':' in resource_elements and '/' in resource_elements:
        # 'arn:partition:service:region:account-id:resourcetype/resource:qualifier'
        resource_type, remaining = resource_elements.split('/')
        resource, qualifier = remaining.split(':')

    return service, region, account_id, resource_type, resource, qualifiers