Bilibili API Query Signature

api.bilibili.signature.js

var crypto = require('crypto'),
	_ = require('underscore'),
	APP_KEY = false,
	APP_SECRET = false;
function getSignedQueryString(query) {
	if (!APP_SECRET) {
		throw 'ERROR: App-Secret not provided';
		return false;
	}
	var queryKeys = [],
		sortedQuery = {};
	for (var key in query) {
		if (query.hasOwnProperty(key) && query[key]) {
			queryKeys.push(key);
		}
	}
	queryKeys.sort();
	var signedQueryString = '',
		queryString = '';
	_.each(queryKeys, function(queryKey) {
		queryString += queryKey + '=' + query[queryKey] + '&';
		signedQueryString += encodeURIComponent(queryKey) + '=' + encodeURIComponent(query[queryKey]) + '&';
	});
	queryString = queryString.substr(0, queryString.length - 1);
	signedQueryString = signedQueryString.substr(0, signedQueryString.length - 1);
	signedQueryString += '&sign=' + crypto.createHash('md5').update(new Buffer(signedQueryString + APP_SECRET, 'utf-8')).digest('hex');
	return signedQueryString;
}