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HTML

              
                <h3>Dragons Bless Online Verifier</h3>	
<div id="container" class="container">	
	
	<div id="form" class="block">
		
		<div class="field">
			<label for="server_seed">Server seed</label>
			<input id="server_seed" type="text" class="form_text"/>
		</div>
		
		<div class="field">
			<label for="client_seed">Client seed</label>
			<input id="client_seed" type="text" class="form_text"/>
		</div>
		
		<div class="field">
			<label for="nonce">Nonce</label>
			<input id="nonce" type="text" class="form_text"/>
		</div>
		
		<div class="field">
			<label for="config">Config</label>
			<input id="config" type="text" class="form_text"/>					
		</div>
		
		<div class="field">
			<label for="configDescription">Config Description</label>
			<div id="configDescription" class="configDescription"></div>
		</div>
		
		<div class="field">
			<label for="hash">Server seed SHA512</label>
			<textarea id="hash" type="text" class="form_text" disabled></textarea>
		</div>
		
	</div>
	
	<div class="block">
		<label for="resultPanel">Result</label>
		<div id="resultPanel" class="resultPanel"></div>
	</div>	
	
</div>
              
            
!

CSS

              
                body {
	font-family: "Roboto Mono", monospace !important;
	min-width: 320px;
	box-sizing: border-box;
	padding: 10px;
	h3 {
		margin-left: 2.5px;
	}
	.container {
		display: flex;
		flex-wrap: wrap;
		width: 100%;
		box-sizing: border-box;
		.block {
			flex: 1;
			min-width: 250px;
			margin: 0 2.5px;
			box-sizing: border-box;
			label {
				font-weight: bold;
				font-size: 20px;
				box-sizing: border-box;
			}
			.field {
				display: flex;
				flex-direction: column;
				box-sizing: border-box;
				margin-bottom: 5px;
				textarea,
				input {
					outline: none;
					font-size: 13px;
					padding: 5px;
					width: 100%;
					border-radius: 5px;
					border: 1px solid #888888;
					box-sizing: border-box;
					background-color: #ffffe1;
				}
				textarea {
					resize: none;
					height: 80px;
				}
				.configDescription {
					display: inline-block;
					font-size: 15px;
				}
			}
		}
	}
}


img {
	height: 32px;
	margin-right: 2px;
}
.img {
	height: 32px;
	margin-bottom: 2px;
}
.red{ color:#ff0000; }
.green{ color:#008800; }
              
            
!

JS

              
                const params = {
	server_seed:"",
	client_seed:"",
	nonce:"",
	config:""
};

const modes = [
	{ win: 3, lose: 1, name:"Very easy" },
	{ win: 2, lose: 1, name:"Easy" },
	{ win: 1, lose: 1, name:"Normal" },
	{ win: 1, lose: 2, name:"Hard" },
	{ win: 1, lose: 3, name:"Very hard" }
];

const roll = (serverSeed, clientSeed, nonce, step) => {
	const keyString = clientSeed + "-" + nonce + "-" + step;
	const hash = sha512.hmac(serverSeed, keyString);	
	const random = parseInt(hash.substring(0, 5), 16) / 1048576;
	//between min - max values	
	const mode = modes[params.config];	
	const max = mode.win + mode.lose;	
	return Math.floor(random * max);	
};

function showRandomResult(random){		
	let icons = [
		"<img src='https://res.cloudinary.com/dez0s9s32/image/upload/v1570365610/pandora/games/dragonsBless/btnLose.png' />",
		"<img src='https://res.cloudinary.com/dez0s9s32/image/upload/v1570365610/pandora/games/dragonsBless/btnGold.png'/>"
	];
	const mode = modes[params.config];
	let count = mode.win + mode.lose;
	let html = "";	
	if(mode.lose > mode.win) icons.reverse();
	for(let i = random.length - 1; i >= 0; i--){		
		html += "<div class='img'>";
		for(let k = 0; k < count; k++)			
				html += k === random[i] ? icons[0] : icons[1];			
		html += "</div>";
	}
	let config_text = $("#config").val();
	let description = 'Mode name: <b>' + mode.name + '</b>';
	if(config_text !== "") $("#config").val(params.config);
	else {
		html = "";
		description = "";
	}
	$("#resultPanel").html(html);
	
	$("#configDescription").html(description);	
}

const calculateResult = () => {	
	for(let k in params) params[k] = $("#" + k).val().trim();
	$("#hash").val(sha512(params.server_seed));
	
	//check parameters
	params.config = Math.max(Math.min(TryParseInt(params.config, 0), 4), 0);
	
	//let random = roll(params.server_seed, params.client_seed, params.nonce);
	let random = [];
	for(let i = 0; i < 10; i++)	random.push(roll(params.server_seed, params.client_seed, params.nonce, i));
	showRandomResult(random);
}

window.onload = function(){
	try{
		let url_string = (window.location.href);
		let url = new URL(url_string);		
		for(let k in params) {
			let value = url.searchParams.get(k);
			if(value){
				value = atob(value).trim();
				params[k] = value;
				$("#" + k).val(value);
			}
		}
		calculateResult();
	}
	catch{}
}

$('#form').keyup(()=>calculateResult());

const TryParseInt = (str, defaultValue) => {
     var retValue = defaultValue;
     if(str !== null && str.length > 0 && !isNaN(str)) retValue = parseInt(str);
     return retValue;
}




              
            
!
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