def _upload(awskey, awssecret, filename, bucketname, keyname, acl):
    """
    Uploads a file to S3
    """
    try: 
        conn = S3Connection(awskey, awssecret)
        bucket = conn.get_bucket(bucketname)
        key = bucket.new_key(keyname)
        #key.set_metadata("ETag", _hasher(filename))
        key.set_metadata("Cache-Control", "max-age=31104000")
        key.set_contents_from_filename(filename)
        key.set_acl(acl)
    except S3ResponseError as exc:
        if exc.status == 403:
            sys.exit('Error: Please check your Amazon credentials!')
        elif exc.status == 404:
            sys.exit('Error: Your bucket does not exist (yet)')
    else:
        print (filename, ' Upload successful!')