Make slack Grafana webhooks discord compatible

webhookRelay.js

const express = require('express'),
    bodyParser = require('body-parser'),
    request = require('unirest'),
    app = express();
    
function HEXToVBColor(rrggbb) {
    return parseInt(rrggbb, 16);
}

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

    //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(8080, '0.0.0.0', error => {
    if (error)
        return console.log(error)
    console.log('Webhook Relay online');
});

You don't really need this... Discord already converts Slack on their end. just add /slack to the URL ie. https://discordapp.com/api/webhooks/XXXXX/XXXXXXXX/slack