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<?php
// /var/www/mail2usenet/index.php
// Production‑ready Mail2Usenet Gateway frontend in English,
// with UTC Hashcash, parallel PoW via Web Workers,
// Ed25519 signature (mandatory), and form reset on return.
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Mail2Usenet Gateway – Production</title>
<style>
body.day { background: #f9f9f9; color: #333; }
body.night { background: #333; color: #ddd; }
.container { max-width:960px; margin:auto; padding:20px; box-shadow:0 0 10px rgba(0,0,0,0.1); }
h1,h2 { text-align:center; }
.tabs { text-align:center; margin:20px 0; }
.tabs button { padding:10px 20px; margin:0 5px; cursor:pointer; background:#eee; border:none; }
.tabs button.active { background:#ccc; }
.tab-content { display:none; padding:20px; }
.tab-content.active { display:block; }
label { display:block; margin-top:10px; font-weight:bold; }
input, select, textarea, button { width:100%; padding:8px; margin-top:5px; box-sizing:border-box; }
.progress-bar { width:100%; background:#ddd; border-radius:5px; overflow:hidden; height:20px; margin-top:10px; }
.progress-bar-inner { height:100%; width:0; background:#4caf50; text-align:center; color:#fff; line-height:20px; }
#themeToggle { position:fixed; top:20px; right:20px; padding:8px 12px; background:#888; color:#fff; border:none; border-radius:5px; cursor:pointer; }
.info { font-style:italic; margin-bottom:15px; }
</style>
<!-- Crypto & Web Worker support -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/tweetnacl/1.0.3/nacl.min.js"></script>
<script src="https://unpkg.com/tweetnacl-util@1.0.2/nacl-util.min.js"></script>
<script>
// Fallback if nacl.util is missing
if (typeof nacl.util === 'undefined') {
nacl.util = {
decodeUTF8: str => new TextEncoder().encode(str),
encodeUTF8: arr => new TextDecoder().decode(arr),
encodeBase64: arr => { let s=''; arr.forEach(b=>s+=String.fromCharCode(b)); return btoa(s); },
decodeBase64: b64 => { const bin=atob(b64), a=new Uint8Array(bin.length); for(let i=0;i<bin.length;i++) a[i]=bin.charCodeAt(i); return a; }
};
}
</script>
</head>
<body class="day">
<button id="themeToggle">Night</button>
<div class="container">
<h1>Mail2Usenet Gateway – Production</h1>
<div class="tabs">
<button class="tab-button active" data-tab="token">Generate Hashcash Token</button>
<button class="tab-button" data-tab="signature">Digital Signature</button>
<button class="tab-button" data-tab="send">Send Message</button>
</div>
<!-- 1) Generate Hashcash Token -->
<div id="token" class="tab-content active">
<h2>Generate Hashcash Token</h2>
<p class="info">Client‑side PoW: SHA‑1 with leading hex zeros (6/7/8) to mitigate spam.</p>
<label>Email (resource):
<input type="email" id="hcEmail" placeholder="user@example.com" required>
</label>
<label>Difficulty:
<select id="hcBits">
<option value="24">Fast (24 bits)</option>
<option value="28">Medium (28 bits)</option>
<option value="32">Slow (32 bits)</option>
</select>
</label>
<button id="genTokenBtn">Generate Token</button>
<p>Generated Token: <span id="tokenOutput"></span></p>
<div class="progress-bar"><div id="tokenProgress" class="progress-bar-inner">0</div></div>
<p class="info">Using UTC timestamp (YYMMDDhhmmss) from <code>toISOString()</code>.</p>
</div>
<!-- 2) Digital Signature (Ed25519) -->
<div id="signature" class="tab-content">
<h2>Digital Signature (Ed25519)</h2>
<p class="info">Ephemeral key pair; signature is mandatory and discarded on send.</p>
<label>Message to Sign:
<textarea id="messageToSign" rows="6" placeholder="Enter message"></textarea>
</label>
<button id="genKeyBtn">Generate Key Pair</button>
<button id="signMsgBtn">Sign Message</button>
<p>Public Key: <span id="pubKeyOutput"></span></p>
<p>Signature: <span id="signatureOutput"></span></p>
</div>
<!-- 3) Send Message -->
<div id="send" class="tab-content">
<h2>Send Message to Usenet</h2>
<p class="info">Includes X-Hashcash and X-Ed25519-Sig headers; max 3 newsgroups.</p>
<form id="sendForm" action="send.php" method="POST">
<label>User Name:
<input type="text" id="fromName" placeholder="Your Name" required>
</label>
<label>Email:
<input type="email" id="fromEmail" placeholder="user@example.com" required>
</label>
<input type="hidden" id="fromCombined" name="from">
<label>Newsgroups (max 3):
<input type="text" id="newsgroups" name="newsgroups" placeholder="comp.lang.go, ..." required>
</label>
<label>Subject:
<input type="text" id="subject" name="subject" required>
</label>
<label>References (optional):
<input type="text" id="references" name="references" placeholder="<msgid@domain>">
</label>
<label>Token X-Hashcash:
<input type="text" id="hcToken" name="xhashcash" required>
</label>
<label>Message:
<textarea id="messageContent" name="message" rows="8" required></textarea>
</label>
<input type="hidden" name="x-ed25519-pub" id="x-ed25519-pub">
<input type="hidden" name="x-ed25519-sig" id="x-ed25519-sig">
<button type="submit">Send</button>
</form>
</div>
</div>
<script>
// Theme toggle
document.getElementById('themeToggle').onclick = () => {
const b = document.body, btn = document.getElementById('themeToggle');
b.classList.toggle('night'); b.classList.toggle('day');
btn.innerText = b.classList.contains('night') ? 'Day' : 'Night';
};
// Tab navigation
document.querySelectorAll('.tab-button').forEach(btn => {
btn.onclick = () => {
document.querySelectorAll('.tab-button').forEach(b=>b.classList.remove('active'));
document.querySelectorAll('.tab-content').forEach(c=>c.classList.remove('active'));
btn.classList.add('active');
document.getElementById(btn.dataset.tab).classList.add('active');
};
});
// Clear form on back-button
window.addEventListener('pageshow', () => document.getElementById('sendForm').reset());
// Parallel PoW via Web Workers, UTC timestamp
document.getElementById('genTokenBtn').onclick = () => {
const email = document.getElementById('hcEmail').value.trim();
const bits = +document.getElementById('hcBits').value;
if (!email) return alert('Enter a valid email.');
const now = new Date(), iso = now.toISOString();
const dateStr =
iso.substr(2,2)+iso.substr(5,2)+iso.substr(8,2)+
iso.substr(11,2)+iso.substr(14,2)+iso.substr(17,2);
const ext='', rand=Math.floor(Math.random()*1e6).toString();
const prefix = `1:${bits}:${dateStr}:${email}:${ext}:${rand}:`;
const zeros = bits/4, cores = navigator.hardwareConcurrency||2;
let found=false, totalChecked=Array(cores).fill(0);
const prog = document.getElementById('tokenProgress');
prog.style.width='0%'; prog.innerText='0';
const workers=[];
function upd() {
const sum = totalChecked.reduce((a,b)=>a+b,0),
pct = Math.min(100,(sum%(cores*1000))/(cores*10));
prog.style.width=pct+'%'; prog.innerText=sum;
}
for(let i=0;i<cores;i++){
const w=new Worker('powWorker.js');
w.postMessage({ prefix, targetZeros:zeros, startNonce:i, step:cores });
w.onmessage=e=>{
if(found) return;
if(e.data.type==='found'){
found=true;
const token=prefix+e.data.nonce;
document.getElementById('tokenOutput').innerText=token;
document.getElementById('hcToken').value=token;
document.getElementById('fromEmail').value=email;
workers.forEach(x=>x.terminate());
}
if(e.data.type==='progress'){
totalChecked[i]=e.data.checked; upd();
}
};
workers.push(w);
}
};
// Ed25519 signature
let keyPair=null;
document.getElementById('genKeyBtn').onclick = () => {
try {
keyPair = nacl.sign.keyPair();
document.getElementById('pubKeyOutput').innerText = nacl.util.encodeBase64(keyPair.publicKey);
alert('Key pair generated. Secret key will be discarded.');
} catch(e){ alert('Key generation error: '+e); }
};
document.getElementById('signMsgBtn').onclick = () => {
if(!keyPair) return alert('Generate key pair first.');
const msg=document.getElementById('messageToSign').value;
if(!msg) return alert('Enter a message.');
try {
const sig=nacl.sign.detached(nacl.util.decodeUTF8(msg),keyPair.secretKey),
sigB64=nacl.util.encodeBase64(sig),
pubB64=nacl.util.encodeBase64(keyPair.publicKey);
document.getElementById('signatureOutput').innerText=sigB64;
document.getElementById('x-ed25519-sig').value=sigB64;
document.getElementById('x-ed25519-pub').value=pubB64;
document.getElementById('messageContent').value=msg+"\n\n--- Digital Signature ---\n"+sigB64;
} catch(e){ alert('Signing error: '+e); }
};
// Combine From
function updateFrom(){
const n=document.getElementById('fromName').value.trim(),
e=document.getElementById('fromEmail').value.trim();
if(n&&e) document.getElementById('fromCombined').value=`${n} <${e}>`;
}
document.getElementById('fromName').oninput=updateFrom;
document.getElementById('fromEmail').oninput=updateFrom;
updateFrom();
</script>
</body>
</html>
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