Get free shadowsocks server from ishadowsocks.com. [Node.js]

ishadowsocks.serverConfig.js

/**
 * Get free shadowsocks from ishadowsocks.
 * the server password will change every 6 hours.
 * ------------------------------------
 * @author huzemin8 <huzemin8@126.com>
 */

var cheerio = require('cheerio');
var fs = require('fs');
var path = require('path');
var superagent = require('superagent');
function parseKey(str) {
    var pair = str.split(':');
    return pair;
}

function getConfiguration() {
        // 判断配置文件是否存在
    var config_file = path.resolve(__dirname,"gui-config.json");
    var config;
    if(fs.exists(config_file)) {
        config = fs.readFileSync(config_file, 'utf-8');
        config = JSON.parse(config);
    } else {
        // default configurate
        config = {
            "configs": [],
            "strategy": null,
             "index": 1,
             "global": true,
             "enabled": true,
             "shareOverLan": false,
             "isDefault": false,
             "localPort": 1080,
             "pacUrl": null,
             "useOnlinePac": false,
             "availabilityStatistics": false
        }
    }


    superagent.get('http://www.ishadowsocks.com/').end(function(err, res){
        if(!err) {
            if(res.ok) {
                var $ = cheerio.load(res.text, {decodeEntities: false});
                var frees = $('#free .row .col-lg-4');
                var servers_config = [];
                frees.each(function(index, f) {
                    var s = {};
                    $(f).find('h4').each(function(id, el){
                        var $el = $(el),
                        text = $el.text(),
                        pair = parseKey(text);
                        if(/服务器/.test(pair[0])) {
                            s['server'] = pair[1];
                        } else if(/端口/.test(pair[0])) {
                            s['server_port'] = pair[1];
                        } else if(/^\w密码$/.test(pair[0])) {
                            s['password'] = pair[1];
                        } else if(/加密/.test(pair[0])) {
                            s['method'] = pair[1];
                        }
                    });
                    s['remarks'] = '';
                    servers_config.push(s);
                });
                // 替换配置
                config.configs = servers_config;
                // 写入配置文件
                fs.writeFile(config_file, JSON.stringify(config, null, '    '), 'utf-8', function(err){
                   if(!err) {
                       console.log('配置刷新成功！');
                   }
                });
            } else {
                throw new Error("The status of Response isn't Ok.");
            }
        }
    });
}
console.log("Run...");
getConfiguration();

setInterval(function(){
    getConfiguration();
}, 3600 * 6 * 1000);

package.json

{
  "dependencies": {
    "superagent": "^1.6.1", 
    "cheerio": "^0.19.0"
  },
}