Discord Webhook Relay for Grafana (deprecated now that Grafana has this built-in)

discordwebhookrelay.service

[Unit]
Description=webhookRelay.js - a Slack to Discord webhook relay for Grafana
Documentation=https://gist.github.com/brussell98/a865ecc2284e958226596accc852ee28
After=network.target

[Service]
Type=simple
User=nobody
ExecStart=/usr/bin/node /opt/discordWebhookRelay/webhookRelay.js
Restart=on-failure

[Install]
WantedBy=multi-user.target

webhookRelay.js

const express = require('express'),
    bodyParser = require('body-parser'),
    request = require('unirest'),
    app = express();

app.disable('x-powered-by');
app.set('env', 'production');

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

app.post('/relay/:id/:token', log, (req, res) => {
    if (!req.params.id || !req.params.token || !req.body)
        res.sendStatus(400);

    if (req.body.payload) {
        req.body = JSON.parse(req.body.payload);
    }

    for (let attachment of req.body.attachments) {
                if (!attachment.fields)
                        continue;
                for (let field of attachment.fields) {
            field.name = field.title;
            delete field.title;
                        delete field.short;
            field.value = field.value.toString();
                }
    }

    var embed = { "embeds": [{
        "url": req.body.attachments[0].title_link.replace(/ /g,''),
        "image": { "url": req.body.attachments[0].image_url.replace(/ /g,'') },
        "title": req.body.attachments[0].title,
        "description": req.body.attachments[0].text,
        "color": parseInt((req.body.attachments[0].color.replace(/#/g,'')), 16),
        "fields": req.body.attachments[0].fields,
        "timestamp": new Date().toISOString(),
        "footer": {
          "icon_url": req.body.attachments[0].footer_icon.replace(/ /g,''),
          "text": req.body.attachments[0].footer
        }
    }]};

    console.log("Relaying " + req.body.attachments[0].title + " it is " + new Date().toISOString());
    //console.log('Relaying data: ' + require('util').inspect(embed, { depth: null }));

    request.post(`https://canary.discordapp.com/api/webhooks/${req.params.id}/${req.params.token}?wait=true`)
        .type('application/json')
        .header('User-Agent', 'Webhook-Relay v1')
        .send(embed)
        .end(response => {
            if (response.ok) {
                //console.log('Relay Response: ' + require('util').inspect(response.body, { depth: null }));
                res.status(200).send(response.body);
            } else {
                console.error('Relay Error: ' + require('util').inspect(response.body, { depth: null }));
                res.sendStatus(500);
            }
        });
});

app.use((req, res) => {
    res.status(404);

    if (req.accepts('html'))
        res.send('<h1>' + req.url + ' not found</h1>');
    else if (req.accepts('json'))
        res.send({ error: 'Not found' });
    else
        res.type('txt').send('Not found');
});

function log(req, res, next) {
    console.log(`${req.method} ${req.path} from ${req.headers['x-forwarded-for'] || req.connection.remoteAddress || req.socket.remoteAddress || req.connection.socket.remoteAddress}`);
    return next();
}

app.listen(4321, '127.0.0.1', error => {
    if (error)
        return console.log(error)
    console.log('Webhook Relay online');
});