const jwt = require('jsonwebtoken')
const request = require("request");
const http = require('http')

// The following retrieves the certificate used for validating tokens
let private_key
request({uri: "https://loginalsburger.nl/main.crt"}, 
    function(error, response, body) {
        if (error) return console.error(error)
            public_key = body
    })
})

function process_token(received_token){
    try {
        var decoded = jwt.verify(received_token, public_key, {algorithm: 'RS256'})
        let parsed = JSON.parse(decoded)
        if ('data' in parsed){
            for (let pdf of parsed.data)
                if('timestamp' in pdf)
                    console.log('Timestamp of RDW pdf', pdf.timestamp)
        } else return 'Unknown token format'
        return decoded
    } catch (err) {
        return err
    }
}

// The following simulates your custom application
const server = http.createServer((req, res) => {
    let data = '';
    req.on('data', chunk => {
        data += chunk
    })

    if(req.method.toLowerCase() !== 'post')
        return res.end('ERROR not a post msg')
    if ( (! req.headers.origin) ||
         (req.headers.origin.indexOf('//loginalsburger.nl') === -1 ) ) 
            return res.end('ERROR unknown Origin')

    req.on('end', () => {
        let received_token = data.replace('data=','')
        let result = process_token(received_token)
        res.end(result)
    })
})
server.listen(3000)