Equim-chan / csu-ems-api

    express = require('express'),

    superagent = require('superagent'),

    cheerio = require('cheerio'),

    escaper = require('true-html-escape'),

    colors = require('colors'),

    program = require('commander'),

program

    .option('-h, --help')

    .option('-v, --version')

    .option('-f, --fulllog')

    .parse(process.argv);

// 别问我为什么这里逻辑这么奇怪……测试的结果确实是这样的啊hhh

if (!program.help || !program.version) {

    console.log(('by The Liberators').rainbow);

    if (!program.help) {

        console.log('Preparation:')

        console.log('  \\\\This section is WIP\\\\');

        console.log('\nUsage:');

        console.log('  npm start [-- <options>]');

        console.log('\nOptions:');

        console.log('  -h, --help          print this message and exit.');

        console.log('  -v, --version       print the version and exit.');

        console.log('  -f, --fulllog       enable full log, by default only errors are logged.');

        console.log('  -p, --port [value]  specify a port to listen, 2333 by default.');

        console.log('\nExamples:');

        console.log('  $ npm start -p 43715                      # listening to 43715');

        console.log('  # forever start app.js                    # deploy with forever as daemon (root access recommended)');

        console.log('  # pm2 start app.js -i 0 --name "CSUEMSR"  # deploy with pm2 as daemon  (root access recommended)');

    }

}

const timeStamp = () => new Date().format('[MM-dd hh:mm:ss] '),

      port = program.port || 2333;

// 直接从主页上扒下来的，哈希算法

const encodeInp = (input) => {

    let keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";

    let output = "";

    let chr1, chr2, chr3 = "";

    let enc1, enc2, enc3, enc4 = "";

    let i = 0;

    do {

        chr1 = input.charCodeAt(i++);

        chr2 = input.charCodeAt(i++);

        chr3 = input.charCodeAt(i++);

        enc1 = chr1 >> 2;

        enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);

        enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);

        enc4 = chr3 & 63;

        if (isNaN(chr2)) {

            enc3 = enc4 = 64

        } else if (isNaN(chr3)) {

            enc4 = 64

        }

        output = output + keyStr.charAt(enc1) + keyStr.charAt(enc2) + keyStr.charAt(enc3) + keyStr.charAt(enc4);

    } while (i < input.length);

    return output;

};

// 登出时用到的函数，一样是从原网页扒下来的

const getRandomUrl = (htmlurl) => {

    let count = htmlurl.indexOf("?");

    let date = new Date();

    let t = Date.parse(date);    

    if (count < 0) {

        htmlurl = htmlurl + "?tktime=" + t;

    } else {

        htmlurl = htmlurl + "&tktime=" + t;

    }

    return htmlurl;

}

// 登录模块

const login = (id, pwd, res, callback) => {

    // 通过GET首页，来获取cookie

    superagent.get('http://csujwc.its.csu.edu.cn/jsxsd')

        .end(function (err, ires) {

            if (err) {

                res.send({ error: '获取Cookie失败' });

                return;

            }

            program.fulllog && console.log((timeStamp() + 'Successfully got the Cookie.').green);

            // 登录POST请求的headers，是我抓包来的

            let headers = {

                Host: 'csujwc.its.csu.edu.cn',

                Connection: 'keep-alive',

                'Cache-Control': 'max-age=0',

                Accept: 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8',

                Origin: 'http://csujwc.its.csu.edu.cn',

                'Upgrade-Insecure-Requests': 1,

                'User-Agent': 'Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36',

                'Content-Type': 'application/x-www-form-urlencoded',

                Referer: 'http://csujwc.its.csu.edu.cn/jsxsd/',

                'Accept-Encoding': 'gzip, deflate',

                'Accept-Language': 'zh-CN,zh;q=0.8',

                Cookie: ires.headers['set-cookie']     // 猜测：感觉这个cookie也是不变的，不过出于稳定性，还是动态获取了

            }

            let account = encodeInp(id);

            let passwd = encodeInp(pwd);

            let encoded = escaper.escape(account + "%%%" + passwd);

            // POST登录

            superagent.post('http://csujwc.its.csu.edu.cn/jsxsd/xk/LoginToXk')

                .set(headers)

                .type('form')

                .send({ encoded: encoded })

                .end(function (err, iires) {

                    // 如果登录信息正确，这里是对http://csujwc.its.csu.edu.cn/jsxsd/framework/xsMain.jsp的GET请求

                    // 如果错误，会变成对http://csujwc.its.csu.edu.cn/jsxsd/xk/LoginToXk的POST请求

                    if (err || /POST/i.test(iires.req.method)) {

                        res.send({ error: '登录失败，可能是用户名或密码错误' });

                        return;

                    }

                    program.fulllog && console.log((timeStamp() + 'Successfully logged in.').green);

                    // 将相应的headers和返回的response（刚进去的首页）传入callback

                    callback(headers, iires);

                });

        });

};

var app = express();

// 查成绩API，通过GET传入用户名和密码

app.listen(port);