github-tracker.js

const https = require('https')

const webhook = "YOUR WEBHOOK HERE"

const log = message => new Promise((done, _) => {
    const request = https.request(webhook, {
        method: 'POST',
        header: {
            'Content-Type': 'application/json'
        }
    }, done)

    // bind error to console.error so it's not halting
    request.on('error', console.error)
    
    request.write(JSON.stringify({
        text: message
    }))

    request.end()
})

const TOKEN = "YOUR TOKEN HERE"

const lookup = ip => new Promise((done, _) => {

    const request = https.request({
      method: "GET",
      hostname: "reveal.clearbit.com",
      path: `/v1/companies/find?ip=${ip}`,
      headers: {
        "authorization": `Basic ${TOKEN}`
      }
    }, res => {
        let profile = ""
        res.on('data', d => profile += d)
        res.on('end', () => done(JSON.parse(profile)))
    })

    // bind error to console.error so it's not halting
    request.on('error', console.error)
    request.end()
})

const PIXEL = 
    "\x42\x4d\x3c\x00\x00\x00\x00\x00\x00\x00\x36\x00\x00\x00\x28\x00" + 
    "\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x01\x00\x18\x00\x00\x00" +
    "\x00\x00\x06\x00\x00\x00\x27\x00\x00\x00\x27\x00\x00\x00\x00\x00" +
    "\x00\x00\x00\x00\x00\x00\xff\xff\xff\xff\x00\x00";

exports.handler = async event => {
    const response = {
        statusCode: 500,
        body: JSON.stringify({
            error: 'An error occurred.'
        }),
    }
    try {
        const ip = event['requestContext']['http']['sourceIp']
        const userAgent = event['requestContext']['http']['userAgent']
        if (userAgent.includes('github-camo')) {
            response.body = PIXEL;
            response.statusCode = 404;
            await log(`Someone visited my GitHub profile!`)
            return response;
        }
        const profile = await lookup(ip).catch(console.error)
        if (profile && profile.company) {
            const name = profile.company.name
            const domain = profile.company.domain
            await log(`${name} (${domain}) visited!`);
        }
        response.body = PIXEL
        response.statusCode = 200
        return response
    } catch (e) {
        console.error(e)
        return response
    }
}