dt4XH2YP

1/**
2	 * Sign the API request with body.
3	 */
4	public static String signApiRequest(Map<String, String> params, String body, String appSecret, String routeName) throws IOException {
5		// first: sort all text parameters
6		String[] keys = params.keySet().toArray(new String[0]);
7		Arrays.sort(keys);
8 
9		// second: connect all text parameters with key and value
10		StringBuilder query = new StringBuilder();
11       query.append(routeName);
12		for (String key : keys) {
13			String value = params.get(key);
14			if (areNotEmpty(key, value)) {
15				query.append(key).append(value);
16			}
17		}
18 
19		// third：put the body to the end
20		if (body != null) {
21			query.append(body);
22		}
23 
24		// next : sign the whole request
25		byte[] bytes = null;
26		
27		bytes = encryptHMACSHA256(query.toString(), appSecret);
28 
29		// finally : transfer sign result from binary to upper hex string
30		return byte2hex(bytes);
31	}
32 
33	
34    private static byte[] encryptHMACSHA256(String data, String secret) throws IOException  {
35    	byte[] bytes = null;
36    	try {
37	        SecretKey secretKey = new SecretKeySpec(secret.getBytes(Constants.CHARSET_UTF8), Constants.SIGN_METHOD_HMAC_SHA256);
38	        Mac mac = Mac.getInstance(secretKey.getAlgorithm());
39	        mac.init(secretKey);
40	        bytes = mac.doFinal(data.getBytes(Constants.CHARSET_UTF8));
41    	} catch (GeneralSecurityException gse) {
42            throw new IOException(gse.toString());
43        }
44        return bytes;
45    }
46 
47	/**
48	 * Transfer binary array to HEX string.
49	 */
50	public static String byte2hex(byte[] bytes) {
51		StringBuilder sign = new StringBuilder();
52		for (int i = 0; i < bytes.length; i++) {
53			String hex = Integer.toHexString(bytes[i] & 0xFF);
54			if (hex.length() == 1) {
55				sign.append("0");
56			}
57			sign.append(hex.toUpperCase());
58		}
59		return sign.toString();
60	}