sample-nodejs/ais-decoupled.js at master · Fintecture/sample-nodejs · GitHub

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const { FintectureClient } = require('fintecture-client');
const app = require("express")();
const path = require('path');
const dotenv = require('dotenv');
const qrcode = require('qrcode');

dotenv.config({ path: path.join(__dirname, '.env') });

require('dotenv').config();

// Create the fintecture client instance
let client = new FintectureClient({ app_id: process.env.APP_ID, app_secret: process.env.APP_SECRET, private_key: process.env.APP_PRIV_KEY, env: process.env.FINTECTURE_ENV });

// Define accessToken and CustomerID global variables
let accessToken;
let customerId;

// Construct a provider selector pane
app.get("/", async (req, res) => {
    res.writeHead(200, { 'Content-Type': 'text/html; charset=utf-8' });
    res.write('<html><body>');

    try {
        // Get list of available banks
        let options = { 'filter[ais]': 'accounts', 'filter[psu_type]': 'retail', 'filter[auth_model]': 'decoupled', 'sort[full_name]': 'asc' }
        let providers = await client.getProviders(options);

        res.write(_prettyDisplayProviders(providers));
    }
    catch (err) {
        res.write(err.response ? JSON.stringify(err.response.data) : 'error getting providers');
    }

    res.end('</html></body>');
});

app.get("/provider/:provider/psu", async (req, res) => {
    res.writeHead(200, { 'Content-Type': 'text/html; charset=utf-8' });
    res.end(_prettyDisplayPSUform(req.params.provider));
});

app.get("/provider/:provider/auth", async (req, res) => {
    res.writeHead(200, { 'Content-Type': 'text/html; charset=utf-8' });
    res.write('<html><body>');

    let psuId = req.query.psu_id;
    let psuIpAddress = req.headers['x-forwarded-for'] || '127.0.0.1';

    try {

        let providerAuth = await client.getDecoupledAuthUrl(null, req.params.provider, psuId, psuIpAddress, process.env.APP_REDIRECT_URI);

        res.write('Mobile authentication started, please open your bank app to authenticate. <br><br>');

        if (!!providerAuth.triggers) {
            const b64img = await qrcode.toDataURL(providerAuth.triggers.qr);
            res.write('<img src="' + b64img + '" alt="QR" /><br><br>');
            res.write('A2A <a href="' + providerAuth.triggers.a2a +'">App2App</a> <br><br>');
        }


        res.write('loading . .')
        // Initiate a decopled authentication and get the polling URL
        while (true) {
            await delay(2100);
            try {
                // poll the decoupled authentication status
                let auth = await client.getDecoupledAuthStatus(null, req.params.provider, providerAuth.polling_id);

                if (auth.status == 'COMPLETED') {
                    res.write(_redirect('/callback?code=' + auth.code + '&customer_id=' + auth.customer_id));
                    break;
                } else if (auth.status == 'FAILED') {
                    res.write('<br><br>Decoupled auth FAILED');
                    break;
                } else {
                    res.write(' .')
                }
            } catch (err) {
                res.write('error');
            }

        }
    }
    catch (err) {
        res.write(err.response ? JSON.stringify(err.response.data) : 'error');
    }
    res.end('</html></body>');
});

// Get 'code' querystring parameter and hit data api
app.get("/callback", async (req, res) => {
    const code = req.query.code || 'unknown';
    customerId = req.query.customer_id;

    res.writeHead(200, { 'Content-Type': 'text/html; charset=utf-8' });
    res.write('</html></body>');

    try {
        // get the Fintecture access token to request the AIS APIs
        const tokens = await client.getAccessToken(code);
        accessToken = tokens.access_token;

        // get the Account details from the PSU
        const accounts = await client.getAccounts(accessToken, customerId);
        res.write(_prettyDisplayAccounts(accounts));
    }
    catch (err) {
        res.write(err.response ? JSON.stringify(err.response.data) : 'error')
    }

    res.write('</html></body>');
    res.end();
});

app.get("/transactions/:account", async (req, res) => {
    const account = req.params.account;

    res.writeHead(200, { 'Content-Type': 'text/html; charset=utf-8' });
    res.write('</html></body>');

    try {
        // get the Transaction details from the PSU
        const transactions = await client.getTransactions(accessToken, customerId, account);
        res.write(_prettyDisplayTransactions(transactions));
    }
    catch (err) {
        res.write(err.response ? JSON.stringify(err.response.data) : 'error')
    }
    res.end('</html></body>');
});

var _prettyDisplayProviders = function (providers) {
    let list = '';
    providers.data.forEach(provider => {
        list = list + '<a href="/provider/' + provider.id + '/psu">' + provider.attributes.full_name + '</a><br>';
    });
    return list;
}

var _prettyDisplayAccounts = function (accounts) {
    let headers = '<tr><th>account_id</th><th>IBAN</th><th>Name</th><th>balance</th><th>currency</th></tr>'
    let rows = '';
    accounts.data.forEach(account => {
        rows = rows + '<tr><td><a href="../transactions/' + account.id + '">' + account.attributes.account_id + '</a></td><td>' + account.attributes.iban + '</td><td>' + account.attributes.account_name + '</td><td>' + account.attributes.balance + '</td><td>' + account.attributes.currency + '</td><tr>';
    });
    return '<table style="border:1px black;padding: 10px;">' + headers + rows + '</table>';
};

var _prettyDisplayTransactions = function (transactions) {
    let headers = '<tr><th>date</th><th>communication</th><th>amount</th><th>currency</th></tr>'
    let rows = '';
    transactions.data.forEach(txn => {
        rows = rows + '<tr><td>' + txn.attributes.booking_date + '</td><td>' + txn.attributes.communication + '</td><td>' + txn.attributes.amount + '</td><td>' + txn.attributes.currency + '</td><tr>';
    });
    return '<table style="border:1px black;padding: 10px;">' + headers + rows + '</table>';
}

var _prettyDisplayPSUform = function (provider) {
   return `
        <html><body><br>
        PSU ID: <input type="text" id="psu_id" value="193805010844"><br>
        <br>
        <button onclick="next()">Next</button>
        <script>function next() { window.location.href = "/provider/${provider}/auth?psu_id=" + document.getElementById("psu_id").value }</script>
        </html></body>`
}

var _redirect = function (url) {
    return '<script type="text/javascript"> window.location.href = "' + url + '"; </script>'
}

var delay = async function (ms) {
    return await new Promise(resolve => setTimeout(resolve, ms));
}

app.listen(1235, () => console.log("Fintecture App listening on port 1235..."))