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index.js
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index.js
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import { ethers } from 'ethers';
let defaultHtml = `
<!DOCTYPE html>
<body>
<p> Various helpful APIs for sovereign individuals and Ethereum afficionados. By odyslam.eth.</p>
<p> All functionality uses your metamask provider, without ever having access to sensitive information. The client uses ethers-js.</p>
<p> You can easily inspect the source of this webpage to verify just how simple it is. It uses cloudflare workers to generate the HTML based on the URL.</p>
<p> <a href="https://github.com/odyslam/ethereum-worker-tools">View on GitHub and leave a star </a></p>
<p><b>/sign/<message>:</b> Sign an arbitrary message with your web3 wallet (e.g metamask). It will return the signed message.</p>
<p><b>/verify/<address>/<signed_message>/<message>:</b> Verifies that a signed message originates from the specific address.</p>
<p><b>/send/<contract_address>/<function_signature>/<function_arguments>:</b> Execute a smart contract's function by sending a transaction.<br>
<b>example:</b> /send/0x7EeF591A6CC0403b9652E98E88476fe1bF31dDeb/balanceOf(address,uint256) view returns(uint256)/"0x8DbD1b711DC621e1404633da156FcC779e1c6f3E" 42
</p>
<p><b>/call/<contract_address>/<function_signature>/<function_arguments>:</b> Call a smart contract's function without sending a transaction. It reads the state of the smart contract without changing the state on the blockchain.<br>
<b>example:</b> /send/0x7EeF591A6CC0403b9652E98E88476fe1bF31dDeb/balanceOf(address,uint256) view returns(uint256)/"0x8DbD1b711DC621e1404633da156FcC779e1c6f3E" 42
</p>
<body>
</html>
`
let signHtml = `
<!DOCTYPE html>
<script src="https://cdn.ethers.io/lib/ethers-5.2.umd.min.js"
type="application/javascript"></script>
<script>
async function signData(){
const enable = await window.ethereum.enable();
if(enable){
const provider = new ethers.providers.Web3Provider(window.ethereum)
const signer = provider.getSigner()
let address = await signer.getAddress();
let signature = await signer.signMessage("MSG_TO_SIGN");
document.getElementById("sig").innerHTML = signature;
document.getElementById("msg").innerHTML = "MSG_TO_SIGN";
document.getElementById("acc").innerHTML = address;
}
}
signData();
</script>
<body>
<h1>Sign a Message</h1>
<p>
Account: <span id="acc"></span> <br>
Message: <span id="msg"></span> <br>
Signature: <span id="sig"></span> <br>
</p>
</body>
</html>`
let sendHtml = `
<!DOCTYPE html>
<script src="https://cdn.ethers.io/lib/ethers-5.2.umd.min.js"
type="application/javascript"></script>
<script>
async function sendTransaction(){
const enable = await window.ethereum.enable();
if(enable){
const provider = new ethers.providers.Web3Provider(window.ethereum)
const signer = provider.getSigner()
const contractAddress = "CONTRACT_ADDRESS";
const contractABI = ["function FUNCTION_SIGNATURE"];
const contract = new ethers.Contract(contractAddress, contractABI, signer);
let tx_info = await contract.FUNCTION_METHOD(METHOD_ARGUMENTS);
let tx_mined = await transaction.wait();
document.getElementById("tx_info").innerHTML = tx_info;
document.getElementById("tx_wait").innerHTML = tx_mined;
}
}
sendTransaction();
</script>
<h1> Send a Transaction </h1>
<p>
Transaction info: <span id="tx_info"></span> <br>
Transaction mined: <span id="tx_wait"></span> <br>
</p>
</body>
</html>`
let callHtml= `
<!DOCTYPE html>
<script src="https://cdn.ethers.io/lib/ethers-5.2.umd.min.js"
type="application/javascript"></script>
<script>
async function callTransaction(){
const enable = await window.ethereum.enable();
if(enable){
const provider = new ethers.providers.Web3Provider(window.ethereum)
const contractAddress = "CONTRACT_ADDRESS";
const contractABI = ["function FUNCTION_SIGNATURE"];
const contract = new ethers.Contract(contractAddress, contractABI, provider);
let tx_info = await contract.FUNCTION_METHOD(METHOD_ARGUMENTS);
document.getElementById("tx_info").innerHTML = tx_info;
}
}
callTransaction();
</script>
<h1> Call a function</h1>
<p>
Call result: <span id="tx_info"></span> <br>
</p>
</body>
</html>
`
addEventListener('fetch', event => {
event.respondWith(handleRequest(event.request))
})
async function handleRequest(request) {
const { pathname } = new URL(request.url);
if (pathname.startsWith("/sign")) {
let tokens = pathname.split('/');
let message = decodeURIComponent(tokens.slice(2).join("")).replaceAll(/"/g, '\\\"');
let output = signHtml.replaceAll("MSG_TO_SIGN", message);
return new Response(output, {
headers: {
"content-type": "text/html;charset=UTF-8",
},
})
}
else if (pathname.startsWith("/verify")) {
try{
let tokens = pathname.split('/');
let verified = false;
let address = tokens[2];
let signature = tokens[3];
let message = decodeURIComponent(tokens.slice(4).join("")).replaceall(/"/g, '\\\"');
let signedAddress = ethers.utils.verifyMessage(message, signature);
if (signedAddress == address){
verified = true;
}
let response = {
"address": address,
"message": message,
"signature": signature,
"verified": verified
};
return new Response(JSON.stringify(response), {
headers: {
"content-type": "application/json",
},
})
}
catch(error){
console.error("Error ", error.toString());
return new Response(JSON.stringify({"error": error}), {
headers: {
"content-type": "application/json",
},
})
}
}
else if (pathname.startsWith("/send")) {
let tokens = pathname.split('/');
let address = tokens[2];
let signature = decodeURIComponent(tokens[3]);
let args = decodeURIComponent(tokens[4]);
args = args.replaceAll(" ", ",");
let method = signature.split('(')[0];
let input = sendHtml.replaceAll("CONTRACT_ADDRESS", address);
input = input.replaceAll("FUNCTION_SIGNATURE", signature);
input = input.replaceAll("FUNCTION_METHOD", method);
input = input.replaceAll("METHOD_ARGUMENTS", args);
return new Response(input, {
headers: {
"content-type": "text/html;charset=UTF-8",
},
})
}
else if (pathname.startsWith("/call")) {
let tokens = pathname.split('/');
let address = tokens[2];
let signature = decodeURIComponent(tokens[3]);
let args = decodeURIComponent(tokens[4]);
args = args.replaceAll(" ", ",");
let method = signature.split('(')[0];
let input = callHtml.replaceAll("CONTRACT_ADDRESS", address);
input = input.replaceAll("FUNCTION_SIGNATURE", signature);
input = input.replaceAll("FUNCTION_METHOD", method);
input = input.replaceAll("METHOD_ARGUMENTS", args);
return new Response(input, {
headers: {
"content-type": "text/html;charset=UTF-8",
},
})
}
else {
return new Response(defaultHtml, {
headers: {
"content-type": "text/html;charset=UTF-8",
},
})
}
}
function isNumeric(value) {
return /^-?\d+$/.test(value);
}