54 lines
1.9 KiB
JavaScript
54 lines
1.9 KiB
JavaScript
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// Browser-safe Witness Layer: Ephemeral P2P chat (WebRTC stub; full in annex)
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// Use window.crypto for PoW
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async function sha256(message) {
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const msgBuffer = new TextEncoder().encode(message);
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const hashBuffer = await window.crypto.subtle.digest('SHA-256', msgBuffer);
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const hashArray = Array.from(new Uint8Array(hashBuffer));
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return hashArray.map(b => b.toString(16).padStart(2, '0')).join('');
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}
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async function computePoW(nonce, difficulty = 4, maxIter = 1e6) {
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let i = 0;
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while (i < maxIter) {
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const hash = await sha256(nonce.toString());
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if (hash.startsWith('0'.repeat(difficulty))) return nonce;
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nonce++;
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i++;
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}
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throw new Error('PoW max iterations exceeded');
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}
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function initWitness(roomId) {
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// WebRTC stub with quarantine: No direct storage write
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const rtcConfig = { iceServers: [{ urls: 'stun:stun.l.google.com:19302' }] }; // Trusted STUN only
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const peerConnection = new RTCPeerConnection(rtcConfig);
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const channel = peerConnection.createDataChannel('chat');
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channel.onmessage = e => {
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document.getElementById('chat').innerHTML += `<p>${e.data}</p>`;
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};
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// Bootstrap from Genesis (stub: load aether.json via fetch)
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fetch('/genesis/aether.json').then(res => res.json()).then(genesis => {
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console.log('Bootstrapped from Genesis:', genesis);
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// Signal to peers (annex for full signaling)
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});
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// Offline mode: localStorage persistence
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const localState = localStorage.getItem('witness_state') || '{}';
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console.log('Offline state loaded:', localState);
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// Send with PoW
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document.getElementById('send').addEventListener('click', async () => {
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const msg = document.getElementById('msg').value;
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const nonce = await computePoW(0);
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const payload = JSON.stringify({ msg, nonce });
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channel.send(payload);
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// Persist offline
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localStorage.setItem('witness_state', JSON.stringify({ lastMsg: msg }));
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});
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}
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// Expose
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window.witness = { connect: initWitness };
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