Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Introducing Permit Signature #217

Merged
merged 2 commits into from
Mar 1, 2023
Merged

Introducing Permit Signature #217

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
b4d17aa
Permit Signature first part
seaona Mar 1, 2023
a3ad2f2
Merge branch 'main' into permit
seaona Mar 1, 2023
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
40 changes: 40 additions & 0 deletions src/index.html
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -751,6 +751,46 @@ <h4>
</div>
</div>
</div>
<div
class="col-xl-4 col-lg-6 col-md-12 col-sm-12 col-12 d-flex align-items-stretch"
>
<div class="card full-width">
<div class="card-body">
<h4>
Sign Permit
</h4>

<button
class="btn btn-primary btn-lg btn-block mb-3"
id="signPermit"
disabled
>
Sign
</button>

<p class="info-text alert alert-warning">
Result:
<span id="signPermitResult"></span>
<p class="info-text alert alert-warning" id="signPermitResultR">r: </p>
<p class="info-text alert alert-warning" id="signPermitResultS">s: </p>
<p class="info-text alert alert-warning" id="signPermitResultV">v: </p>
</p>

<button
class="btn btn-primary btn-lg btn-block mb-3"
id="signPermitVerify"
disabled
>
Verify
</button>

<p class="info-text alert alert-warning">
Recovery result:
<span id="signPermitVerifyResult"></span>
</p>
</div>
</div>
</div>
<div
class="col-xl-4 col-lg-6 col-md-12 col-sm-12 col-12 d-flex align-items-stretch"
>
Expand Down
165 changes: 165 additions & 0 deletions src/index.js
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -171,6 +171,15 @@ const signTypedDataV4Verify = document.getElementById('signTypedDataV4Verify');
const signTypedDataV4VerifyResult = document.getElementById(
'signTypedDataV4VerifyResult',
);
const signPermit = document.getElementById('signPermit');
const signPermitResult = document.getElementById('signPermitResult');
const signPermitResultR = document.getElementById('signPermitResultR');
const signPermitResultS = document.getElementById('signPermitResultS');
const signPermitResultV = document.getElementById('signPermitResultV');
const signPermitVerify = document.getElementById('signPermitVerify');
const signPermitVerifyResult = document.getElementById(
'signPermitVerifyResult',
);
const siwe = document.getElementById('siwe');
const siweResources = document.getElementById('siweResources');
const siweBadDomain = document.getElementById('siweBadDomain');
Expand Down Expand Up @@ -319,6 +328,8 @@ const initialize = async () => {
signTypedDataV3Verify,
signTypedDataV4,
signTypedDataV4Verify,
signPermit,
signPermitVerify,
siwe,
siweResources,
siweBadDomain,
Expand Down Expand Up @@ -378,6 +389,7 @@ const initialize = async () => {
signTypedData.disabled = false;
signTypedDataV3.disabled = false;
signTypedDataV4.disabled = false;
signPermit.disabled = false;
siwe.disabled = false;
siweResources.disabled = false;
siweBadDomain.disabled = false;
Expand Down Expand Up @@ -1610,6 +1622,159 @@ const initialize = async () => {
}
};

/**
* Sign Permit
*/
signPermit.onclick = async () => {
const networkId = parseInt(networkDiv.innerHTML, 10);
const chainId = parseInt(chainIdDiv.innerHTML, 16) || networkId;
const from = accounts[0];

const domain = {
name: 'MyToken',
version: '1',
verifyingContract: '0xCcCCccccCCCCcCCCCCCcCcCccCcCCCcCcccccccC',
chainId,
};

const EIP712Domain = [
{ name: 'name', type: 'string' },
{ name: 'version', type: 'string' },
{ name: 'verifyingContract', type: 'address' },
{ name: 'chainId', type: 'uint256' },
];

const permit = {
owner: from,
spender: '0x5B38Da6a701c568545dCfcB03FcB875f56beddC4',
value: 3000,
nonce: 0,
deadline: 50000000000,
};

const Permit = [
{ name: 'owner', type: 'address' },
{ name: 'spender', type: 'address' },
{ name: 'value', type: 'uint256' },
{ name: 'nonce', type: 'uint256' },
{ name: 'deadline', type: 'uint256' },
];

const splitSig = (sig) => {
const pureSig = sig.replace('0x', '');

const _r = Buffer.from(pureSig.substring(0, 64), 'hex');
const _s = Buffer.from(pureSig.substring(64, 128), 'hex');
const _v = Buffer.from(
parseInt(pureSig.substring(128, 130), 16).toString(),
);

return { _r, _s, _v };
};

let sign;
let r;
let s;
let v;

const msgParams = {
types: {
EIP712Domain,
Permit,
},
primaryType: 'Permit',
domain,
message: permit,
};

try {
sign = await ethereum.request({
method: 'eth_signTypedData_v4',
params: [from, JSON.stringify(msgParams)],
});
const { _r, _s, _v } = splitSig(sign);
r = `0x${_r.toString('hex')}`;
s = `0x${_s.toString('hex')}`;
v = _v.toString();

signPermitResult.innerHTML = sign;
signPermitResultR.innerHTML = `r: ${r}`;
signPermitResultS.innerHTML = `s: ${s}`;
signPermitResultV.innerHTML = `v: ${v}`;
signPermitVerify.disabled = false;
} catch (err) {
console.error(err);
signPermitResult.innerHTML = `Error: ${err.message}`;
}
};

/**
* Sign Permit Verification
*/
signPermitVerify.onclick = async () => {
const networkId = parseInt(networkDiv.innerHTML, 10);
const chainId = parseInt(chainIdDiv.innerHTML, 16) || networkId;
const from = accounts[0];

const domain = {
name: 'MyToken',
version: '1',
verifyingContract: '0xCcCCccccCCCCcCCCCCCcCcCccCcCCCcCcccccccC',
chainId,
};

const EIP712Domain = [
{ name: 'name', type: 'string' },
{ name: 'version', type: 'string' },
{ name: 'verifyingContract', type: 'address' },
{ name: 'chainId', type: 'uint256' },
];

const permit = {
owner: from,
spender: '0x5B38Da6a701c568545dCfcB03FcB875f56beddC4',
value: 3000,
nonce: 0,
deadline: 50000000000,
};

const Permit = [
{ name: 'owner', type: 'address' },
{ name: 'spender', type: 'address' },
{ name: 'value', type: 'uint256' },
{ name: 'nonce', type: 'uint256' },
{ name: 'deadline', type: 'uint256' },
];

const msgParams = {
types: {
EIP712Domain,
Permit,
},
primaryType: 'Permit',
domain,
message: permit,
};
try {
const sign = signPermitResult.innerHTML;
const recoveredAddr = recoverTypedSignatureV4({
data: msgParams,
sig: sign,
});
if (toChecksumAddress(recoveredAddr) === toChecksumAddress(from)) {
console.log(`Successfully verified signer as ${recoveredAddr}`);
signPermitVerifyResult.innerHTML = recoveredAddr;
} else {
console.log(
`Failed to verify signer when comparing ${recoveredAddr} to ${from}`,
);
}
} catch (err) {
console.error(err);
signPermitVerifyResult.innerHTML = `Error: ${err.message}`;
}
};

function handleNewAccounts(newAccounts) {
accounts = newAccounts;
accountsDiv.innerHTML = accounts;
Expand Down