var express = require("@runkit/runkit/express-endpoint/1.0.0");
var app = express(exports);
const crypto = require('crypto')
let clientSeed = ''
let serverSeed = ''
let serverHash = ''
let caseQuantity = 1
let dailyCase = false
async function getResults() {
let winningTickets = []
const serverHashBuffer = Buffer.from(serverHash, 'hex');
const serverSeedHash = crypto.createHash('sha256').update(serverSeed).digest();
if (!serverSeedHash.equals(serverHashBuffer)) {
return { matches: false, winningTickets };
}
for (let case_num = 1; case_num <= caseQuantity; case_num++) {
let hmac = crypto.createHmac('SHA512', serverSeed)
hmac.write(clientSeed)
if (!dailyCase) {
hmac.write(case_num.toString())
}
let buf = hmac.digest()
let winningTicket = Math.floor((buf.readUInt32BE() / Math.pow(2, 32)) * 10000)
winningTickets.push(winningTicket)
}
return {matches: true, winningTickets}
}
getResults()
.then(({ matches, winningTickets }) => {
if (matches) {
console.log(`Winning tickets:`);
winningTickets.forEach((ticket, i) => {
console.log(`Case #${i + 1}: ${ticket}`);
});
} else {
console.log("Server hash doesn't match server seed.");
}
})
.catch((error) => {
console.error("An error occurred:", error);
});
// ENDPOINT CODE - IRRELEVANT FOR IN-CODE VERIFICATION
app.get("/", async (req, res) => {
clientSeed = req.query.clientSeed
serverSeed = req.query.serverSeed
serverHash = req.query.serverHash
dailyCase = req.query.dailyCase === 'true'
if (!dailyCase) caseQuantity = parseInt(req.query.caseQuantity)
const {matches, winningTickets} = await getResults()
let html = `<body style="margin: 0"><div style="display: flex; align-items: center; justify-content: center; flex-direction: column; width: 100%; height: 100%; background: #1E242B;">`
html += matches
? `<img src="https://img.icons8.com/color/344/checked.png" style="height: 75px;width: 75px;">`
: `<img src="https://img.icons8.com/color/344/cancel.png" style="height: 75px;width: 75px;">`
let ticketString = ''
winningTickets.forEach((ticket, i) => {
ticketString += `<h3 style="margin: 0; color: white">Case #${i + 1}: ${ticket}</h2>`
})
html += matches
? `<h3 style="margin: 0; color: white">Tickets:</h3>
${ticketString}`
: `<h3 style="margin: 0; color: white">Private seed hash doesn't match private seed</h3>`
res.send(html)
})
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