public String uptoken(String bucketName) {
		Config.ACCESS_KEY = "GIPrRa79vysQJ3eeGe2BelfHPAvmc3XZFwlizBnl";
		Config.SECRET_KEY = "_Mfbit9p5lxC4wJsUdMWFvdVv9OIxyWnb7aeJyis";

		Mac mac = new Mac(Config.ACCESS_KEY, Config.SECRET_KEY);
		PutPolicy putPolicy = new PutPolicy(bucketName);
		String uptoken = "";
		try {
			uptoken = putPolicy.token(mac);
		} catch (AuthException e) {
			e.printStackTrace();
		} catch (JSONException e) {
			e.printStackTrace();
		}
		return uptoken;
	}