Course Selecting Script

main.js

const superagent = require("superagent");
const nodemailer = require("nodemailer");

const cookie = ''
const pageUrl = "https://yjsxk.nju.edu.cn/yjsxkapp/sys/xsxkapp/xsxkCourse/loadFanCourseInfo.do"
const addLessonUrl = "https://yjsxk.nju.edu.cn/yjsxkapp/sys/xsxkapp/xsxkCourse/choiceCourse.do";
const userAgent = "USER_AGENT = 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.159 Safari/537.36'";
const courseID = "";
const token = "";

const notify = async () => {
    const transporter = nodemailer.createTransport({
        host: 'smtp.qq.com',
        port: 465,
        auth: {
            user: 'tanglizimail@foxmail.com',
            pass: ''
        }
    });

    await transporter.sendMail({
        from: 'tanglizimail@foxmail.com',
        to: 'tanglizimail@foxmail.com',
        subject: 'Course Selecting Notify',
        html: '<h1>capacity unreached! Quickly!!!</h1>'
    });
};

const selectCourse = async () => {
    try {
        const res = await superagent
            .get(pageUrl)
            .set("cookie", cookie)
            .set("User-Agent", userAgent);
        const course = JSON.parse(res.text).datas
            .find(x => x.BJDM === courseID)

        if (course.KXRS < 165 || course.DQRS < 165) {
            console.log("capacity <165");
            notify();

            const result = await superagent
                .post(addLessonUrl)
                .set("cookie", cookie)
                .set("User-Agent", userAgent)
                .field('bjdm', courseID)
                .field('lx', 2)
                .field('csrfToken', token);

            console.log(result);
            return true
        } else {
            console.log("capacity reached");
            return false
        }
    } catch (err) {
        console.log(err);
        return false;
    }
    return false;
};

const sleep = ms => new Promise(resolve => setTimeout(resolve, ms));
(async () => {
    while (!await selectCourse())
        await sleep(5 * 1000);
})();