Verify case battle fairness directly on the site.
// ==UserScript==
// @name Rain.GG Case Battle Verifier
// @namespace https://gge.gg
// @version 1.11
// @description Verify case battle fairness directly on the site.
// @match https://rain.gg/*
// @require https://code.jquery.com/jquery-3.6.0.min.js
// @require https://cdnjs.cloudflare.com/ajax/libs/crypto-js/4.1.1/crypto-js.min.js
// @require https://cdnjs.cloudflare.com/ajax/libs/crypto-js/4.1.1/hmac-sha512.min.js
// @grant none
// @icon https://www.google.com/s2/favicons?sz=64&domain=rain.gg
// @license WTFPL
// @author twitter.com/thes0meguy
// ==/UserScript==
(function() {
'use strict';
function waitForModal() {
const modal = document.getElementById('modal_window');
if (modal && !modal.dataset.verifierInjected) {
injectVerifier(modal);
modal.dataset.verifierInjected = 'true';
}
}
const modalCheckInterval = setInterval(waitForModal, 500);
function injectVerifier(modal) {
let serverSeed = getInputValueByLabelText(modal, 'Server seed');
let eosBlockHash = getInputValueByLabelText(modal, 'EOS block hash');
if (!serverSeed || !eosBlockHash) {
console.warn('Could not automatically find Server seed or EOS block hash.');
return;
serverSeed = prompt('Please enter the Server seed:', '');
eosBlockHash = prompt('Please enter the EOS block hash:', '');
if (!serverSeed || !eosBlockHash) {
alert('Error: Server seed and EOS block hash are required.');
return;
}
}
const roundsDiv = createInputDiv('Number of Rounds', `<input type="number" min="1" value="1" id="rounds-input" style="display: flex;
flex-grow: 1;
padding: 9px 12px;
border: 0px;
outline: none;
min-height: 38px;
background-color: transparent;
color: inherit;
font-family: var(--font-geogrotesque-wide);
font-weight: 500;
font-size: 14px;
line-height: 1.42957;
text-transform: none;
caret-color: rgb(240, 242, 245) !important;">`);
const playersDiv = createInputDiv('Number of Players', `
<select id="players-select" style="display: flex;
flex-grow: 1;
padding: 9px 12px;
border: 0px;
outline: none;
min-height: 38px;
background-color: transparent;
color: inherit;
font-family: var(--font-geogrotesque-wide);
font-weight: 500;
font-size: 14px;
line-height: 1.42957;
text-transform: none;
caret-color: rgb(240, 242, 245) !important;">
<option value="2">2 players</option>
<option value="3">3 players</option>
<option value="4">4 players</option>
<option value="6">6 players</option>
</select>
`);
const buttonDiv = document.createElement('div');
buttonDiv.style.textAlign = 'center';
buttonDiv.style.marginTop = '15px';
buttonDiv.innerHTML = `
<button id="verify-btn" style=" font-size: 16px;
display: flex;
align-items: center;
justify-content: center;
cursor: pointer;
outline: none;
border-radius: 8px;
letter-spacing: 0.6px;
background-color: rgb(246, 175, 22);
color: rgb(1, 16, 30);
min-height: 32px;
padding: 7px 12px;
width: 100%;
font-family: var(--font-geogrotesque-wide);
font-weight: 900;">VERIFY</button>
`;
const resultsDiv = document.createElement('div');
resultsDiv.id = 'results';
resultsDiv.style.marginTop = '20px';
const insertPoint = modal.querySelector('div[class*="sc-482ebc6f-0"]');
if (!insertPoint) {
console.error('Could not find the insert point in the modal.');
return;
}
insertPoint.appendChild(roundsDiv);
insertPoint.appendChild(playersDiv);
insertPoint.appendChild(buttonDiv);
insertPoint.appendChild(resultsDiv);
document.getElementById('verify-btn').addEventListener('click', function() {
const rounds = parseInt(document.getElementById('rounds-input').value);
const players = parseInt(document.getElementById('players-select').value);
if (isNaN(rounds) || rounds < 1) {
alert('Please enter a valid number of rounds.');
return;
}
resultsDiv.innerHTML = '';
let tableHtml = '<table style="width: 100%; border-collapse: collapse;">';
tableHtml += '<thead style="text-align: inherit; color: rgb(240, 242, 245);font-family: var(--font-geogrotesque-wide);font-weight: 500;font-size: 12px;line-height: 1.33433;text-transform: none;"><tr><th style="border: 0px solid #ccc; padding: 2px;">Round</th>';
for (let playerNum = 0; playerNum < players; playerNum++) {
tableHtml += `<th style="border: 0px solid #ccc; padding: 2px;">Slot ${playerNum}</th>`;
}
tableHtml += '</tr></thead><tbody style="text-align: center; color: rgb(240, 242, 245);font-family: var(--font-geogrotesque-wide);font-weight: 500;font-size: 12px;line-height: 1.33433;text-transform: none;">';
for (let roundNum = 1; roundNum <= rounds; roundNum++) {
tableHtml += `<tr><td style="border: 0px solid #ccc; padding: 2px;">${roundNum}</td>`;
for (let playerNum = 0; playerNum < players; playerNum++) {
const randomNumber = roll(serverSeed, eosBlockHash, roundNum, playerNum);
tableHtml += `<td style="border: 0px solid #ccc; padding: 2px;">${randomNumber}</td>`;
}
tableHtml += '</tr>';
if (roundNum === rounds) {
tableHtml += `<tr><td style="border: 0px solid #ccc; padding: 2px;">Tie</td>`;
for (let playerNum = 0; playerNum < players; playerNum++) {
const tie = tieRoll(serverSeed, eosBlockHash, roundNum, playerNum);
tableHtml += `<td style="border: 0px solid #ccc; padding: 2px;">${tie}</td>`;
}
tableHtml += '</tr>';
}
}
tableHtml += '</tbody></table>';
resultsDiv.innerHTML = tableHtml;
});
}
function getInputValueByLabelText(modal, labelText) {
const spans = modal.querySelectorAll('span');
for (let span of spans) {
if (span.textContent.trim() === labelText) {
let parentDiv = span.closest('div');
let inputDiv = parentDiv.nextElementSibling;
if (inputDiv) {
const input = inputDiv.querySelector('input');
if (input) {
return input.value;
}
}
}
}
return null;
}
function createInputDiv(labelText, inputHTML) {
const containerDiv = document.createElement('div');
containerDiv.style.marginTop = '10px';
containerDiv.innerHTML = `
<div style="margin-bottom: 5px;">
<span style="text-align: inherit;color: rgb(240, 242, 245);font-family: var(--font-geogrotesque-wide);font-weight: 500;font-size: 12px;line-height: 1.33433;text-transform: none;">${labelText}</span>
</div>
<div style="display: flex; background-color: rgb(1, 16, 30); color: rgb(133, 150, 173); align-items: center; margin-top: 4px; border: 1px solid rgb(37, 57, 82); border-radius: 8px; overflow: hidden;">
${inputHTML}
</div>
`;
return containerDiv;
}
function* getBytesChunks(serverSeed, clientSeed, nonce) {
let step = 0;
let counter = 0;
while (true) {
const hmac = CryptoJS.HmacSHA512(`${clientSeed}:${nonce}:${step}`, serverSeed);
const hashValue = hmac.toString(CryptoJS.enc.Hex);
while (counter < 16) {
const hashBytes = [];
for (let i = 0; i < 4; i++) {
const byteHex = hashValue.substring(i * 2 + counter * 8, i * 2 + 2 + counter * 8);
hashBytes.push(parseInt(byteHex, 16));
}
yield hashBytes;
counter += 1;
}
counter = 0;
step += 1;
}
}
function getFloats(serverSeed, clientSeed, nonce, count) {
const bytesGenerator = getBytesChunks(serverSeed, clientSeed, nonce);
const floats = [];
while (floats.length < count) {
const bytes = bytesGenerator.next().value;
const float = bytes.reduce((acc, value, i) => acc + value / Math.pow(256, i + 1), 0);
floats.push(float);
}
return floats;
}
function roll(serverSeed, eosBlockHash, roundNum, playerNum) {
const nonce = `${roundNum}:${playerNum}`;
const float = getFloats(serverSeed, eosBlockHash, nonce, 1)[0];
return Math.floor(float * 10000000 + 1);
}
function tieRoll(serverSeed, eosBlockHash, roundNum, playerNum) {
const nonce = `${roundNum}:${playerNum}:tie`;
const float = getFloats(serverSeed, eosBlockHash, nonce, 1)[0];
return Math.floor(float * (9999 - 1000 + 1) + 1000);
}
})();