TOP client usual code

top-auth-client.java

//https://github.com/wsky/cross-fire/blob/master/java/src/main/java/com/taobao/top/integration/Util.java

  private static String doSign(String secret, Map<String, String> data) {
  	String[] keys = new String[data.size()];
		data.keySet().toArray(keys);
		Arrays.sort(keys);
		StringBuilder strb = new StringBuilder();
		strb.append(secret);
		for (String k : keys) {
			// data.get(k) != "" sometimes unnecessary
			if (data.get(k) != null && data.get(k) != "") {
				strb.append(k);
				strb.append(data.get(k));
			}
		}
		strb.append(secret);
		return encryptMD5(strb.toString()).toUpperCase();
	}

	private static String encryptMD5(String str) {
		MessageDigest messageDigest = null;
		try {
			messageDigest = MessageDigest.getInstance("MD5");
			messageDigest.reset();
			messageDigest.update(str.getBytes("UTF-8"));
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}
		byte[] byteArray = messageDigest.digest();
		StringBuffer md5StrBuff = new StringBuffer();
		for (int i = 0; i < byteArray.length; i++) {
			if (Integer.toHexString(0xFF & byteArray[i]).length() == 1)
				md5StrBuff.append("0").append(Integer.toHexString(0xFF & byteArray[i]));
			else
				md5StrBuff.append(Integer.toHexString(0xFF & byteArray[i]));
		}
		return md5StrBuff.toString();
	}