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SafeViewer.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<title>Safe State & Safe Tx Hash Checker</title>
<style>
body { font-family: Arial, sans-serif; margin: 2rem; }
input, button, textarea, select { padding: 0.5rem; margin: 0.5rem 0; width: 100%; max-width: 400px; }
.result { margin-top: 1rem; }
label { display: block; margin-top: 1rem; }
.section { border: 1px solid #ddd; padding: 1rem; margin-bottom: 2rem; }
.sub-section { border: 1px solid #ccc; padding: 1rem; margin-top: 1rem; }
.inline-button { display: inline-block; vertical-align: middle; margin-left: 0.5rem; }
pre { background: #f8f8f8; padding: 0.5rem; }
</style>
</head>
<body>
<h1>Safe State & Safe Tx Hash Checker</h1>
<!-- Safe State Section -->
<div class="section">
<h2>Safe State</h2>
<label for="rpc">RPC Endpoint:</label>
<input type="text" id="rpc" value="https://rpc.gnosischain.com" />
<label for="safeAddress">Safe Address:</label>
<input type="text" id="safeAddress" value="0x42cEDde51198D1773590311E2A340DC06B24cB37" />
<button id="checkButton">Check Safe State</button>
<div class="result">
<p><strong>Owners:</strong> <span id="owners">-</span></p>
<p><strong>Nonce:</strong> <span id="nonce">-</span></p>
<p><strong>Threshold:</strong> <span id="threshold">-</span></p>
</div>
</div>
<!-- Safe Tx Hash Section -->
<div class="section">
<h2>Get Safe Tx Hash</h2>
<label for="tx_to">To Address:</label>
<input type="text" id="tx_to" value="0x420CA0f9B9b604cE0fd9C18EF134C705e5Fa3430" />
<label for="tx_value">Value (in wei):</label>
<input type="text" id="tx_value" value="0" />
<label for="tx_data">Data (hex):</label>
<div style="display:flex; align-items:center;">
<input type="text" id="tx_data" value="0xa9059cbb0000000000000000000000007b2e78d4dfaaba045a167a70da285e30e8fca1960000000000000000000000000000000000000000000000000000000000000001" style="flex:1;" />
<button id="toggleFunctionEncoderButton" class="inline-button">Show Function Encoder</button>
</div>
<label for="tx_operation">Operation (0 for CALL, 1 for DELEGATECALL):</label>
<input type="number" id="tx_operation" value="0" min="0" max="1" />
<label for="tx_safeTxGas">SafeTxGas:</label>
<input type="text" id="tx_safeTxGas" value="0" />
<label for="tx_baseGas">BaseGas:</label>
<input type="text" id="tx_baseGas" value="0" />
<label for="tx_gasPrice">GasPrice:</label>
<input type="text" id="tx_gasPrice" value="0" />
<label for="tx_gasToken">GasToken Address:</label>
<input type="text" id="tx_gasToken" value="0x0000000000000000000000000000000000000000" />
<label for="tx_refundReceiver">Refund Receiver Address:</label>
<input type="text" id="tx_refundReceiver" value="0x0000000000000000000000000000000000000000" />
<label for="tx_nonce">Nonce:</label>
<input type="text" id="tx_nonce" value="0" />
<button id="getTxHashButton">Get Safe Tx Hash</button>
<div class="result">
<p><strong>Safe Tx Hash:</strong> <span id="txHashResult">-</span></p>
<p><strong>ApproveHash Calldata:</strong> <span id="approveHashCalldataResult">-</span></p>
<p><strong>Approval Status:</strong></p>
<pre id="approvalStatusResult">-</pre>
<p id="execTxCalldataContainer" style="display:none;">
<strong>Execute Tx Calldata:</strong> <span id="execTxCalldataResult">-</span>
</p>
</div>
<!-- Function Call Encoder Section (hidden by default) -->
<div id="functionEncoder" class="sub-section" style="display:none;">
<h3>Function Call Encoder</h3>
<label for="abiInput">Paste ABI JSON (Default is Full ERC20):</label>
<textarea id="abiInput" rows="12">
[
{
"constant": true,
"inputs": [],
"name": "name",
"outputs": [{"name": "", "type": "string"}],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": false,
"inputs": [
{"name": "_spender", "type": "address"},
{"name": "_value", "type": "uint256"}
],
"name": "approve",
"outputs": [{"name": "success", "type": "bool"}],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": true,
"inputs": [],
"name": "totalSupply",
"outputs": [{"name": "supply", "type": "uint256"}],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": false,
"inputs": [
{"name": "_from", "type": "address"},
{"name": "_to", "type": "address"},
{"name": "_value", "type": "uint256"}
],
"name": "transferFrom",
"outputs": [{"name": "success", "type": "bool"}],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": true,
"inputs": [],
"name": "decimals",
"outputs": [{"name": "", "type": "uint8"}],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": true,
"inputs": [{"name": "_owner", "type": "address"}],
"name": "balanceOf",
"outputs": [{"name": "balance", "type": "uint256"}],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": true,
"inputs": [],
"name": "symbol",
"outputs": [{"name": "", "type": "string"}],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": false,
"inputs": [
{"name": "_to", "type": "address"},
{"name": "_value", "type": "uint256"}
],
"name": "transfer",
"outputs": [{"name": "success", "type": "bool"}],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": true,
"inputs": [
{"name": "_owner", "type": "address"},
{"name": "_spender", "type": "address"}
],
"name": "allowance",
"outputs": [{"name": "remaining", "type": "uint256"}],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"anonymous": false,
"inputs": [
{"indexed": true, "name": "from", "type": "address"},
{"indexed": true, "name": "to", "type": "address"},
{"indexed": false, "name": "value", "type": "uint256"}
],
"name": "Transfer",
"type": "event"
},
{
"anonymous": false,
"inputs": [
{"indexed": true, "name": "owner", "type": "address"},
{"indexed": true, "name": "spender", "type": "address"},
{"indexed": false, "name": "value", "type": "uint256"}
],
"name": "Approval",
"type": "event"
}
]
</textarea>
<button id="loadAbiButton">Load ABI</button>
<div id="functionSelectorContainer" style="display:none;">
<label for="functionSelector">Select Function:</label>
<select id="functionSelector"></select>
</div>
<div id="functionParamsContainer" style="display:none;">
<h4>Function Parameters</h4>
<div id="functionParams"></div>
</div>
<button id="encodeFunctionButton" style="display:none;">Encode Function Call</button>
</div>
</div>
<script>
// --- Helper function to build a dummy signature for a given owner address ---
function buildDummySignature(owner) {
// Remove "0x" and pad left to 64 hex digits.
let r = owner.toLowerCase().replace(/^0x/, '');
r = r.padStart(64, '0');
const s = "0".repeat(64); // 32 bytes of zeros
const v = "01"; // 1 byte for v
return r + s + v; // Concatenate without 0x prefix
}
// --- Safe ABI (includes getOwners, nonce, getThreshold, getTransactionHash, approveHash, approvedHashes, and execTransaction) ---
const safeABI = [
{
"inputs": [],
"name": "getOwners",
"outputs": [{ "internalType": "address[]", "name": "", "type": "address[]" }],
"stateMutability": "view",
"type": "function"
},
{
"inputs": [],
"name": "nonce",
"outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }],
"stateMutability": "view",
"type": "function"
},
{
"inputs": [],
"name": "getThreshold",
"outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }],
"stateMutability": "view",
"type": "function"
},
{
"inputs": [
{ "internalType": "address", "name": "to", "type": "address" },
{ "internalType": "uint256", "name": "value", "type": "uint256" },
{ "internalType": "bytes", "name": "data", "type": "bytes" },
{ "internalType": "uint8", "name": "operation", "type": "uint8" },
{ "internalType": "uint256", "name": "safeTxGas", "type": "uint256" },
{ "internalType": "uint256", "name": "baseGas", "type": "uint256" },
{ "internalType": "uint256", "name": "gasPrice", "type": "uint256" },
{ "internalType": "address", "name": "gasToken", "type": "address" },
{ "internalType": "address", "name": "refundReceiver", "type": "address" },
{ "internalType": "uint256", "name": "_nonce", "type": "uint256" }
],
"name": "getTransactionHash",
"outputs": [{ "internalType": "bytes32", "name": "", "type": "bytes32" }],
"stateMutability": "view",
"type": "function"
},
{
"inputs": [
{ "internalType": "bytes32", "name": "hashToApprove", "type": "bytes32" }
],
"name": "approveHash",
"outputs": [],
"stateMutability": "nonpayable",
"type": "function"
},
{
"inputs": [
{ "internalType": "address", "name": "", "type": "address" },
{ "internalType": "bytes32", "name": "", "type": "bytes32" }
],
"name": "approvedHashes",
"outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }],
"stateMutability": "view",
"type": "function"
},
{
"inputs": [
{ "internalType": "address", "name": "to", "type": "address" },
{ "internalType": "uint256", "name": "value", "type": "uint256" },
{ "internalType": "bytes", "name": "data", "type": "bytes" },
{ "internalType": "uint8", "name": "operation", "type": "uint8" },
{ "internalType": "uint256", "name": "safeTxGas", "type": "uint256" },
{ "internalType": "uint256", "name": "baseGas", "type": "uint256" },
{ "internalType": "uint256", "name": "gasPrice", "type": "uint256" },
{ "internalType": "address", "name": "gasToken", "type": "address" },
{ "internalType": "address", "name": "refundReceiver", "type": "address" },
{ "internalType": "bytes", "name": "signatures", "type": "bytes" }
],
"name": "execTransaction",
"outputs": [{ "internalType": "bool", "name": "", "type": "bool" }],
"stateMutability": "payable",
"type": "function"
}
];
// --- Safe State and Safe Tx Hash functions ---
document.getElementById('checkButton').addEventListener('click', async () => {
document.getElementById('owners').innerText = 'Loading...';
document.getElementById('nonce').innerText = 'Loading...';
document.getElementById('threshold').innerText = 'Loading...';
const rpcEndpoint = document.getElementById('rpc').value;
const safeAddress = document.getElementById('safeAddress').value.trim();
try {
const provider = new ethers.providers.JsonRpcProvider(rpcEndpoint);
const safeContract = new ethers.Contract(safeAddress, safeABI, provider);
const owners = await safeContract.getOwners();
const nonce = await safeContract.nonce();
const threshold = await safeContract.getThreshold();
document.getElementById('owners').innerText = owners.join(', ');
document.getElementById('nonce').innerText = nonce.toString();
document.getElementById('threshold').innerText = threshold.toString();
// Prepopulate the transaction nonce with the safe's nonce
document.getElementById('tx_nonce').value = nonce.toString();
} catch (error) {
console.error(error);
document.getElementById('owners').innerText = 'Error fetching data';
document.getElementById('nonce').innerText = 'Error fetching data';
document.getElementById('threshold').innerText = 'Error fetching data';
}
});
document.getElementById('getTxHashButton').addEventListener('click', async () => {
document.getElementById('txHashResult').innerText = 'Loading...';
document.getElementById('approveHashCalldataResult').innerText = 'Loading...';
document.getElementById('approvalStatusResult').innerText = 'Loading...';
document.getElementById('execTxCalldataContainer').style.display = "none";
const rpcEndpoint = document.getElementById('rpc').value;
const safeAddress = document.getElementById('safeAddress').value.trim();
const to = document.getElementById('tx_to').value.trim();
const value = document.getElementById('tx_value').value.trim();
const data = document.getElementById('tx_data').value.trim();
const operation = parseInt(document.getElementById('tx_operation').value.trim());
const safeTxGas = document.getElementById('tx_safeTxGas').value.trim();
const baseGas = document.getElementById('tx_baseGas').value.trim();
const gasPrice = document.getElementById('tx_gasPrice').value.trim();
const gasToken = document.getElementById('tx_gasToken').value.trim();
const refundReceiver = document.getElementById('tx_refundReceiver').value.trim();
const nonceInput = document.getElementById('tx_nonce').value.trim();
try {
const provider = new ethers.providers.JsonRpcProvider(rpcEndpoint);
const safeContract = new ethers.Contract(safeAddress, safeABI, provider);
// Compute the safe tx hash
const safeTxHash = await safeContract.getTransactionHash(
to,
value,
data,
operation,
safeTxGas,
baseGas,
gasPrice,
gasToken,
refundReceiver,
nonceInput
);
document.getElementById('txHashResult').innerText = safeTxHash;
// Encode the calldata for approveHash using the computed safe tx hash
const iface = new ethers.utils.Interface(safeABI);
const approveHashCalldata = iface.encodeFunctionData("approveHash", [safeTxHash]);
document.getElementById('approveHashCalldataResult').innerText = approveHashCalldata;
// Check approval status for each owner and build a list of approving owners.
const owners = await safeContract.getOwners();
let statusList = "";
let approvedOwners = [];
for (const owner of owners) {
const approved = await safeContract.approvedHashes(owner, safeTxHash);
const isApproved = approved.gt(0);
if (isApproved) {
approvedOwners.push(owner);
}
statusList += `${owner}: ${isApproved ? "Approved" : "Not Approved"}\n`;
}
document.getElementById('approvalStatusResult').innerText = statusList;
const threshold = parseInt(document.getElementById('threshold').innerText);
if (approvedOwners.length >= threshold) {
// Build the signatures parameter by concatenating dummy signatures for the first 'threshold' approving owners.
let signaturesConcat = "";
for (let i = 0; i < threshold; i++) {
const sig = buildDummySignature(approvedOwners[i]); // returns string without 0x
signaturesConcat += sig;
}
signaturesConcat = "0x" + signaturesConcat;
// Encode execTransaction calldata with the concatenated signatures.
const execIface = new ethers.utils.Interface(safeABI);
const execTxCalldata = execIface.encodeFunctionData("execTransaction", [
to,
value,
data,
operation,
safeTxGas,
baseGas,
gasPrice,
gasToken,
refundReceiver,
signaturesConcat
]);
document.getElementById('execTxCalldataResult').innerText = execTxCalldata;
document.getElementById('execTxCalldataContainer').style.display = "block";
} else {
document.getElementById('execTxCalldataContainer').style.display = "none";
}
} catch (error) {
console.error(error);
document.getElementById('txHashResult').innerText = 'Error fetching safe tx hash';
document.getElementById('approveHashCalldataResult').innerText = 'Error encoding approveHash calldata';
document.getElementById('approvalStatusResult').innerText = 'Error checking approval status';
}
});
// --- Function Call Encoder (toggle section) ---
document.getElementById('toggleFunctionEncoderButton').addEventListener('click', () => {
const encoder = document.getElementById('functionEncoder');
if (encoder.style.display === "none") {
encoder.style.display = "block";
document.getElementById('toggleFunctionEncoderButton').innerText = "Hide Function Encoder";
} else {
encoder.style.display = "none";
document.getElementById('toggleFunctionEncoderButton').innerText = "Show Function Encoder";
}
});
document.getElementById('loadAbiButton').addEventListener('click', () => {
const abiText = document.getElementById('abiInput').value;
let abi;
try {
abi = JSON.parse(abiText);
} catch (e) {
alert("Invalid ABI JSON");
return;
}
const functions = abi.filter(item => item.type === "function");
const functionSelector = document.getElementById('functionSelector');
functionSelector.innerHTML = "";
functions.forEach(func => {
const option = document.createElement('option');
option.value = JSON.stringify(func);
option.text = func.name;
functionSelector.appendChild(option);
});
document.getElementById('functionSelectorContainer').style.display = "block";
functionSelector.dispatchEvent(new Event('change'));
});
document.getElementById('functionSelector').addEventListener('change', (event) => {
const selectedFunctionJson = event.target.value;
if (!selectedFunctionJson) {
document.getElementById('functionParamsContainer').style.display = "none";
document.getElementById('encodeFunctionButton').style.display = "none";
return;
}
const selectedFunction = JSON.parse(selectedFunctionJson);
const paramsContainer = document.getElementById('functionParams');
paramsContainer.innerHTML = "";
if (selectedFunction.inputs && selectedFunction.inputs.length > 0) {
selectedFunction.inputs.forEach((input, index) => {
const label = document.createElement('label');
label.innerText = `${input.name} (${input.type}):`;
label.style.display = "block";
const inputField = document.createElement('input');
inputField.type = "text";
inputField.id = `param_${index}`;
paramsContainer.appendChild(label);
paramsContainer.appendChild(inputField);
});
} else {
paramsContainer.innerText = "No parameters for this function.";
}
document.getElementById('functionParamsContainer').style.display = "block";
document.getElementById('encodeFunctionButton').style.display = "block";
});
document.getElementById('encodeFunctionButton').addEventListener('click', () => {
const abiText = document.getElementById('abiInput').value;
let abi;
try {
abi = JSON.parse(abiText);
} catch (e) {
alert("Invalid ABI JSON");
return;
}
const iface = new ethers.utils.Interface(abi);
const functionSelector = document.getElementById('functionSelector');
const selectedFunctionJson = functionSelector.value;
if (!selectedFunctionJson) {
alert("No function selected.");
return;
}
const selectedFunction = JSON.parse(selectedFunctionJson);
const functionName = selectedFunction.name;
let args = [];
if (selectedFunction.inputs && selectedFunction.inputs.length > 0) {
for (let i = 0; i < selectedFunction.inputs.length; i++) {
const inputField = document.getElementById(`param_${i}`);
args.push(inputField.value);
}
}
let encodedData;
try {
encodedData = iface.encodeFunctionData(functionName, args);
} catch (e) {
alert("Error encoding function data: " + e.message);
return;
}
document.getElementById('tx_data').value = encodedData;
alert("Function call encoded and set into the Data field.");
document.getElementById('functionEncoder').style.display = "none";
document.getElementById('toggleFunctionEncoderButton').innerText = "Show Function Encoder";
});
</script>
</body>
</html>