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103 lines
3.6 KiB
103 lines
3.6 KiB
/* eslint-disable */
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const { BN, constants, expectRevert, time } = require('@openzeppelin/test-helpers');
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const { expect } = require('chai');
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const { MAX_UINT256 } = constants;
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const { fromRpcSig } = require('ethereumjs-util');
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const ethSigUtil = require('eth-sig-util');
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const Wallet = require('ethereumjs-wallet').default;
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const ERC20Permit = artifacts.require('$ERC20Permit');
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const { EIP712Domain, Permit, domainSeparator } = require('../../../helpers/eip712');
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const { getChainId } = require('../../../helpers/chainid');
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contract('ERC20Permit', function (accounts) {
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const [initialHolder, spender] = accounts;
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const name = 'My Token';
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const symbol = 'MTKN';
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const version = '1';
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const initialSupply = new BN(100);
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beforeEach(async function () {
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this.chainId = await getChainId();
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this.token = await ERC20Permit.new(name, symbol, name);
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await this.token.$_mint(initialHolder, initialSupply);
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});
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it('initial nonce is 0', async function () {
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expect(await this.token.nonces(initialHolder)).to.be.bignumber.equal('0');
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});
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it('domain separator', async function () {
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expect(await this.token.DOMAIN_SEPARATOR()).to.equal(
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await domainSeparator({ name, version, chainId: this.chainId, verifyingContract: this.token.address }),
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);
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});
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describe('permit', function () {
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const wallet = Wallet.generate();
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const owner = wallet.getAddressString();
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const value = new BN(42);
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const nonce = 0;
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const maxDeadline = MAX_UINT256;
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const buildData = (chainId, verifyingContract, deadline = maxDeadline) => ({
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primaryType: 'Permit',
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types: { EIP712Domain, Permit },
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domain: { name, version, chainId, verifyingContract },
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message: { owner, spender, value, nonce, deadline },
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});
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it('accepts owner signature', async function () {
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const data = buildData(this.chainId, this.token.address);
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const signature = ethSigUtil.signTypedMessage(wallet.getPrivateKey(), { data });
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const { v, r, s } = fromRpcSig(signature);
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await this.token.permit(owner, spender, value, maxDeadline, v, r, s);
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expect(await this.token.nonces(owner)).to.be.bignumber.equal('1');
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expect(await this.token.allowance(owner, spender)).to.be.bignumber.equal(value);
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});
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it('rejects reused signature', async function () {
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const data = buildData(this.chainId, this.token.address);
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const signature = ethSigUtil.signTypedMessage(wallet.getPrivateKey(), { data });
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const { v, r, s } = fromRpcSig(signature);
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await this.token.permit(owner, spender, value, maxDeadline, v, r, s);
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await expectRevert(
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this.token.permit(owner, spender, value, maxDeadline, v, r, s),
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'ERC20Permit: invalid signature',
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);
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});
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it('rejects other signature', async function () {
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const otherWallet = Wallet.generate();
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const data = buildData(this.chainId, this.token.address);
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const signature = ethSigUtil.signTypedMessage(otherWallet.getPrivateKey(), { data });
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const { v, r, s } = fromRpcSig(signature);
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await expectRevert(
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this.token.permit(owner, spender, value, maxDeadline, v, r, s),
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'ERC20Permit: invalid signature',
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);
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});
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it('rejects expired permit', async function () {
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const deadline = (await time.latest()) - time.duration.weeks(1);
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const data = buildData(this.chainId, this.token.address, deadline);
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const signature = ethSigUtil.signTypedMessage(wallet.getPrivateKey(), { data });
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const { v, r, s } = fromRpcSig(signature);
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await expectRevert(this.token.permit(owner, spender, value, deadline, v, r, s), 'ERC20Permit: expired deadline');
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});
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});
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});
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