safe-signer-page/index.html at main · UnitsNetwork/safe-signer-page · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Sign Safe Transaction with MetaMask</title>
    <style>
        body { font-family: Arial, sans-serif; max-width: 800px; margin: 0 auto; padding: 20px; }
        label { display: block; margin-top: 10px; }
        input { width: 100%; padding: 5px; }
        button { margin-top: 10px; padding: 10px; }
        #output { margin-top: 20px; white-space: pre-wrap; }
    </style>
</head>
<body>
<h1>Sign Safe Transaction with MetaMask</h1>
<p>This page allows you to sign a transaction for a Safe wallet using MetaMask. Enter the details below and click Sign.</p>

<button id="connectButton">Connect MetaMask</button>

<form id="txForm" style="display: none;">
    <label for="safeAddress">Safe Address:</label>
    <input type="text" id="safeAddress" placeholder="0x..." required>

    <button id="fetchNonce">Fetch Nonce</button>

    <label for="to">To Address:</label>
    <input type="text" id="to" placeholder="0x..." required>

    <label for="value">Value (in wei):</label>
    <input type="text" id="value" value="0" required>

    <label for="data">Data (hex):</label>
    <input type="text" id="data" value="0x" required>

    <label for="nonce">Nonce:</label>
    <input type="text" id="nonce" required>

    <button type="button" id="signButton">Sign Transaction</button>
</form>

<div id="output"></div>

<script type="module">
    import { ethers } from "https://cdnjs.cloudflare.com/ajax/libs/ethers/6.7.0/ethers.min.js";
    // Your code here...

    let provider;
    let signer;
    let chainId;

    window.addEventListener('load', () => {
        const urlParams = new URLSearchParams(window.location.search);

        if (urlParams.has('safeAddress')) {
            document.getElementById('safeAddress').value = urlParams.get('safeAddress');
        }
        if (urlParams.has('to')) {
            document.getElementById('to').value = urlParams.get('to');
        }
        if (urlParams.has('value')) {
            document.getElementById('value').value = urlParams.get('value');
        }
        if (urlParams.has('data')) {
            document.getElementById('data').value = urlParams.get('data');
        }
    });

    const connectButton = document.getElementById('connectButton');
    const txForm = document.getElementById('txForm');
    const fetchNonce = document.getElementById('fetchNonce');
    const signButton = document.getElementById('signButton');
    const output = document.getElementById('output');

    connectButton.addEventListener('click', async () => {
        if (window.ethereum) {
            provider = new ethers.BrowserProvider(window.ethereum)
            await provider.send("eth_requestAccounts", []);
            signer = await provider.getSigner();
            const network = await provider.getNetwork();
            chainId = network.chainId;
            connectButton.textContent = 'MetaMask Connected';
            connectButton.disabled = true;
            txForm.style.display = 'block';
            output.textContent = `Connected to chain ID: ${chainId}`;
        } else {
            output.textContent = 'MetaMask not detected.';
        }
    });

    fetchNonce.addEventListener('click', async () => {
        const safeAddress = document.getElementById('safeAddress').value;
        if (!ethers.isAddress(safeAddress)) {
            output.textContent = 'Invalid Safe address.';
            return;
        }
        const safeContract = new ethers.Contract(safeAddress, ['function nonce() view returns (uint256)'], provider);
        try {
            const nonce = await safeContract.nonce();
            document.getElementById('nonce').value = nonce.toString();
            output.textContent = `Nonce fetched: ${nonce}`;
        } catch (error) {
            output.textContent = `Error fetching nonce: ${error.message}`;
        }
    });

    signButton.addEventListener('click', async () => {
        const safeAddress = document.getElementById('safeAddress').value;
        if (!ethers.isAddress(safeAddress)) {
            output.textContent = 'Invalid Safe address.';
            return;
        }

        const tx = {
            to: document.getElementById('to').value,
            value: document.getElementById('value').value,
            data: document.getElementById('data').value,
            operation: 0,
            safeTxGas: '0',
            baseGas: '0',
            gasPrice: '0',
            gasToken: '0x0000000000000000000000000000000000000000',
            refundReceiver: '0x0000000000000000000000000000000000000000',
            nonce: document.getElementById('nonce').value
        };

        // Validate addresses
        if (!ethers.isAddress(tx.to) || !ethers.isAddress(tx.gasToken) || !ethers.isAddress(tx.refundReceiver)) {
            output.textContent = 'Invalid address in fields.';
            return;
        }

        // Ensure data is bytes
        try {
            ethers.getBytes(tx.data);
        } catch {
            output.textContent = 'Invalid data hex.';
            return;
        }

        const domain = {
            chainId: chainId,
            verifyingContract: safeAddress
        };

        const types = {
            SafeTx: [
                { type: 'address', name: 'to' },
                { type: 'uint256', name: 'value' },
                { type: 'bytes', name: 'data' },
                { type: 'uint8', name: 'operation' },
                { type: 'uint256', name: 'safeTxGas' },
                { type: 'uint256', name: 'baseGas' },
                { type: 'uint256', name: 'gasPrice' },
                { type: 'address', name: 'gasToken' },
                { type: 'address', name: 'refundReceiver' },
                { type: 'uint256', name: 'nonce' }
            ]
        };

        console.log(signer)

        try {
            const signature = await signer.signTypedData(domain, types, tx);
            output.textContent = `Signature: ${signature}`;
        } catch (error) {
            output.textContent = `Error signing: ${error.message}`;
        }
    });
</script>
</body>
</html>