instrunet_backend/UserInteractions.js

const bodyParser = require("body-parser");
const express = require("express");
let session = require('express-session')

module.exports = function UserInteractions(opts) {
    async function sha256(message) {
        // encode as UTF-8
        const msgBuffer = new TextEncoder().encode(message);

        // hash the message
        const hashBuffer = await crypto.subtle.digest('SHA-256', msgBuffer);

        // convert ArrayBuffer to Array
        const hashArray = Array.from(new Uint8Array(hashBuffer));

        // convert bytes to hex string
        const hashHex = hashArray.map(b => b.toString(16).padStart(2, '0')).join('');
        return hashHex;
    }

    let app = opts.app;
    app.use(session({
        secret: "rtifhg5878fj",
        resave: false,
        saveUninitialized: false,
        cookie: {
            secure: "auto"
        }
    }))
    app.use(bodyParser.json({"limit": "200mb"}));
    app.use(express.json());
    let db = opts.db;
    console.log("init")
    app.post("/userapi", (req, res) => {
        res.end(JSON.stringify(req.session));
    })
    app.post("/login", async function (req, res) {
        db.execute("SELECT uuid from user where username = ? and password = ?", [req.body.username, await sha256(req.body.password)], function (err, result) {
            if (result.length === 0) {
                res.status(500).json({code: 500, R: "DNE"})
                return;
            }
            req.session.uuid = result[0].uuid;
            res.header("").status(200).json({code: 200, R: "SS", uid: result[0].uuid});
        })
    })
    app.post("/register", function (req, res) {
        db.execute("SELECT uuid FROM user WHERE username = ?", [req.body.username], async function (err, rows) {
            if (req.body.username === undefined || req.body.username === "" || req.body.username === null || req.body.password === undefined || req.body.password === "" || req.body.password === null) {
                res.status(500).json({code: 500, R: "PE"})
                return;
            }
            if (err) {
                console.log(err);
                res.status(500).json({code: 500, R: "UNE"});
                return;
            }
            if (rows.length === 0) {
                db.execute("INSERT INTO user (uuid, username, email, password, avatar, time) values (?,?,?,?,?,?)", [crypto.randomUUID(), req.body.username, null, await sha256(req.body.password), null, Date.now()]);
                res.json({code: 200, R: "SS"});

                return;
            }
            res.status(500).json({code: 500, R: "UE"});
            return;
        })
    })
}