index.js

import request from "request";
import randomstring from "randomstring";

class CoSign {
    /**
     * 
     * @param {Object} config Holds the user info
     * @param {String} config.user Username
     * @param {String} config.pass Password
     */
    constructor(config) {
        this.config = config;
        this.tokenGenerated = false;
    }

    /**
     * Generates a User Token
     * @returns {Promise} Token in a String
     */
    getUserToken() {
        return new Promise((resolve, reject) => {
            _cosignCookie().then(d => {
                _cosignLogin(this.config, d).then(c => {
                    _getJWT("https://portal.lancaster.ac.uk/portal/api/profile", c).then(p => {
                        this.tokenGenerated = true;
                        this.config.token = p[0];
                        this.config.cookie = p[1];
                        resolve(p[0]);
                    }).catch(e => {
                        reject(e);
                    });
                }).catch(e => {
                    reject(e);
                });
            }).catch(e => {
                reject(e);
            });
        });
    }

    /**
     * The token of the user
     * Must have run getUserToken() Beforehand
     */
    get token() {
        return (this.tokenGenerated) ? this.config.token : new Error("Token not Generated... Please use getUserToken()");
    }
    
    /**
     * The CoSign cookie for the user
     * Must have run getUserToken() Beforehand
     */
    get cookie() {
        return (this.tokenGenerated) ? this.config.cookie : new Error("Cookie not Generated... Please use getUserToken()");
    }

}



function _cosignCookie() {
    return new Promise((resolve, reject) => {
        const uri = "https://weblogin.lancs.ac.uk/login/?cosign-https-portal.lancaster.ac.uk&https://portal.lancaster.ac.uk/student_portal";
        request(uri, (err, resp, body) => {
            if (err) reject(err);
            resolve(resp.headers["set-cookie"]);
        });
    });
}

function _cosignLogin(config, cookie) {
    return new Promise((resolve, reject) => {
        const user = config.user;
        const pass = config.pass;

        const loginUrl = "https://weblogin.lancs.ac.uk/login/";
        const opts = {
            method: "POST",
            url: loginUrl,
            headers: {
                "Cookie": cookie
            },
            form: {
                required: "",
                ref: "https://myaccount.lancs.ac.uk",
                service: "cosign-https-myaccount.lancs.ac.uk",
                state: "login",
                login: user,
                password: pass,
                otp: "",
                doLogin: "Login"
            },
        };
        request(opts, (err, resp, body) => {
            if (err) reject(err);
            resolve(resp.headers["set-cookie"]);
        });

    });
}

function _getJWT(t, cookie) {
    return new Promise((resolve, reject) => {
        const url = `https://cisweb.lancaster.ac.uk/jwt-proxy-auth?issuer=DSP&return_to=`;

        const e = randomstring.generate({
            length: 50,
            charset: "alphabetic"
        });
        const n = `${url}${t}&state=${e}`;

        request(n, { followRedirect: false, headers: { "Cookie": cookie } }, (err, resp, body) => {
            if (err) reject(err);
            request(resp.headers["location"], { followRedirect: false, headers: { "Cookie": cookie } }, (err, resp, body) => {
                if (err) reject(err);
                request("https://weblogin.lancs.ac.uk" + resp.headers["location"], { followRedirect: false, headers: { "Cookie": cookie } }, (err, resp, body) => {
                    if (err) reject(err);
                    const sc = resp.headers["set-cookie"];
                    request(resp.headers["location"], { followRedirect: false, headers: { "Cookie": sc } }, (err, resp, body) => {
                        if (err) reject(err);
                        const sc = resp.headers["set-cookie"].toString().replace("\u0000", "");
                        request(n, { followRedirect: false, headers: { "Cookie": sc } }, (err, resp, body) => {
                            if (err) reject(err);
                            console.log(sc);
                            const u = new URL(resp.headers["location"].toString());
                            const c = u.searchParams.get("jwt");
                            resolve([c, sc]);
                        });
                    });
                });
            });
        })
    });

}

module.exports = CoSign;