app.js

let express = require('express');
let path = require('path');
let bodyParser = require('body-parser');
let fs = require('fs');
let app = express();

const MongoClient = require('mongodb').MongoClient;
const assert = require('assert');

// Connection URL
const url = 'mongodb://localhost:27017';
// Database Name
const dbName = 'BSMS';

app.use(express.static(path.join(__dirname, 'public')));

app.use(bodyParser.urlencoded({
    extended: false
}));
app.use(bodyParser.json());

app.get('/', (req, res) => {
    console.log('클라이언트 입장.');
});

app.post('/login', (req, res) => {

    let ID_INPUT = req.body.ID;
    let PW_INPUT = req.body.PASSWORD;

    console.log('입력받은 아이디와 비밀번호 :' + ID_INPUT + " 과 " + PW_INPUT);

    MongoClient.connect(url, (err, client) => {
        assert.equal(null, err);

        const db = client.db(dbName);

        db.collection('users').find({
            USERNAME: ID_INPUT,
            PASSWORD: PW_INPUT
        }).count().then((count) => {
            if(count == 0){
                console.log('계정정보가 존재하지 않습니다.');
                res.redirect('/');
            }
            else{
                console.log('로그인 성공');
                res.redirect('/system.html');
            }
           
        })

        client.close();
    })

});

app.get('/system', (req, res) => {

    fs.readFile(path.join(__dirname, '/public/system.html'), (err, data) => {
        assert.equal(null, err);
        res.writeHead(200, {
            'Content-Type': 'text/html'
        });
        res.end(data);
    });

})

app.get('/system/cardcall', (req, res) => {
    let CALL_NUM = req.query.CALL_NUM;
    let DEFAULT = 18;
    console.log('CALL_NUM = > ' + CALL_NUM);

    MongoClient.connect(url, (err, client) => {
        assert.equal(null, err);

        const db = client.db(dbName);
        if (CALL_NUM == 1) {

            db.collection('busstop').find({}).limit(DEFAULT).toArray((err, docs) => {
                assert.equal(null, err);
                res.json(docs);
            })

        } else {

            db.collection('busstop').find({}).skip(18 * (CALL_NUM - 1)).limit(DEFAULT).toArray((err, docs) => {
                assert.equal(null, err);
                res.json(docs);
            })

        }


        client.close();
    })

})

app.get('/system/location_call', (req, res) => {
    
    res.json({lat : 36.321655 , lng : 127.378953});

})

app.post('/system/get_bs_data', (req, res) => {

    let BS_ID = req.body.BS_ID;
    console.log('BS_ID : ' + BS_ID);

    MongoClient.connect(url, (err, client) => {

        assert.equal(null, err);

        const db = client.db(dbName);

        db.collection('busstop').find({
            BS_ID: BS_ID
        }).toArray((err, docs) => {
            res.json(docs);
        })

        client.close();

    })

})

app.listen(3000, () => {
    console.log('The Server is listening on port 3000!!!')
});