def upload_file(file, chalid):
    access_key_id = utils.get_app_config('ACCESS_KEY_ID')
    secret_access_key = utils.get_app_config('SECRET_ACCESS_KEY')
    if access_key_id and secret_access_key:
        s3 = boto3.client(
            's3',
            aws_access_key_id=access_key_id,
            aws_secret_access_key=secret_access_key
        )
        bucket = utils.get_app_config('BUCKET')
    else:
        s3 = boto3.client('s3')
        bucket = utils.get_app_config('BUCKET')

    filename = filter(clean_filename, secure_filename(file.filename).replace(' ', '_'))
    if len(filename) <= 0:
        return False

    md5hash = hashlib.md5(os.urandom(64)).hexdigest()

    key = md5hash + '/' + filename
    s3.upload_fileobj(file, bucket, key)

    db_f = Files(chalid, key)
    db.session.add(db_f)
    db.session.commit()
    return db_f.id, (md5hash + '/' + filename)