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Permit2Vault.t.sol
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Permit2Vault.t.sol
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// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.17;
import "solmate/tokens/ERC20.sol";
import "../patterns/permit2/Permit2Vault.sol";
import "./TestUtils.sol";
contract Permit2VaultTest is TestUtils {
bytes32 constant TOKEN_PERMISSIONS_TYPEHASH =
keccak256("TokenPermissions(address token,uint256 amount)");
bytes32 constant PERMIT_TRANSFER_FROM_TYPEHASH = keccak256(
"PermitTransferFrom(TokenPermissions permitted,address spender,uint256 nonce,uint256 deadline)TokenPermissions(address token,uint256 amount)"
);
Permit2Clone permit2 = new Permit2Clone();
TestERC20 token = new TestERC20();
ReenteringERC20 badToken = new ReenteringERC20();
Permit2Vault vault;
uint256 ownerKey;
address owner;
constructor() {
vm.chainId(1);
vault = new Permit2Vault(permit2);
ownerKey = _randomUint256();
owner = vm.addr(ownerKey);
vm.prank(owner);
token.approve(address(permit2), type(uint256).max);
}
function test_canDeposit() external {
uint256 amount = _randomUint256() % 1e18 + 1;
token.mint(owner, amount);
IPermit2.PermitTransferFrom memory permit = IPermit2.PermitTransferFrom({
permitted: IPermit2.TokenPermissions({
token: IERC20(address(token)),
amount: amount
}),
nonce: _randomUint256(),
deadline: block.timestamp
});
bytes memory sig = _signPermit(permit, address(vault), ownerKey);
vm.prank(owner);
vault.depositERC20(
IERC20(address(token)),
amount,
permit.nonce,
permit.deadline,
sig
);
assertEq(vault.tokenBalancesByUser(owner, IERC20(address(token))), amount);
assertEq(token.balanceOf(address(vault)), amount);
assertEq(token.balanceOf(owner), 0);
}
function test_cannotReusePermit() external {
uint256 amount = _randomUint256() % 1e18 + 1;
token.mint(owner, amount);
IPermit2.PermitTransferFrom memory permit = IPermit2.PermitTransferFrom({
permitted: IPermit2.TokenPermissions({
token: IERC20(address(token)),
amount: amount
}),
nonce: _randomUint256(),
deadline: block.timestamp
});
bytes memory sig = _signPermit(permit, address(vault), ownerKey);
vm.prank(owner);
vault.depositERC20(
IERC20(address(token)),
amount,
permit.nonce,
permit.deadline,
sig
);
vm.expectRevert(abi.encodeWithSelector(Permit2Clone.InvalidNonce.selector));
vm.prank(owner);
vault.depositERC20(
IERC20(address(token)),
amount,
permit.nonce,
permit.deadline,
sig
);
}
function test_cannotUseOthersPermit() external {
uint256 amount = _randomUint256() % 1e18 + 1;
token.mint(owner, amount);
IPermit2.PermitTransferFrom memory permit = IPermit2.PermitTransferFrom({
permitted: IPermit2.TokenPermissions({
token: IERC20(address(token)),
amount: amount
}),
nonce: _randomUint256(),
deadline: block.timestamp
});
bytes memory sig = _signPermit(permit, address(vault), ownerKey);
vm.expectRevert(abi.encodeWithSelector(Permit2Clone.InvalidSigner.selector));
vm.prank(_randomAddress());
vault.depositERC20(
IERC20(address(token)),
amount,
permit.nonce,
permit.deadline,
sig
);
}
function test_cannotUseOtherTokenPermit() external {
TestERC20 token2 = new TestERC20();
vm.prank(owner);
token2.approve(address(permit2), type(uint256).max);
uint256 amount = _randomUint256() % 1e18 + 1;
token.mint(owner, amount);
token2.mint(owner, amount);
IPermit2.PermitTransferFrom memory permit = IPermit2.PermitTransferFrom({
permitted: IPermit2.TokenPermissions({
token: IERC20(address(token2)),
amount: amount
}),
nonce: _randomUint256(),
deadline: block.timestamp
});
bytes memory sig = _signPermit(permit, address(vault), ownerKey);
vm.prank(owner);
vm.expectRevert(Permit2Clone.InvalidSigner.selector);
vault.depositERC20(
IERC20(address(token)),
amount,
permit.nonce,
permit.deadline,
sig
);
}
function test_canWithdraw() external {
uint256 amount = _randomUint256() % 1e18 + 2;
token.mint(owner, amount);
IPermit2.PermitTransferFrom memory permit = IPermit2.PermitTransferFrom({
permitted: IPermit2.TokenPermissions({
token: IERC20(address(token)),
amount: amount
}),
nonce: _randomUint256(),
deadline: block.timestamp
});
bytes memory sig = _signPermit(permit, address(vault), ownerKey);
vm.prank(owner);
vault.depositERC20(
IERC20(address(token)),
amount,
permit.nonce,
permit.deadline,
sig
);
vm.prank(owner);
vault.withdrawERC20(IERC20(address(token)), amount - 1);
assertEq(token.balanceOf(owner), amount - 1);
assertEq(token.balanceOf(address(vault)), 1);
}
function test_cannotWithdrawOthers() external {
uint256 amount = _randomUint256() % 1e18 + 1;
token.mint(owner, amount);
IPermit2.PermitTransferFrom memory permit = IPermit2.PermitTransferFrom({
permitted: IPermit2.TokenPermissions({
token: IERC20(address(token)),
amount: amount
}),
nonce: _randomUint256(),
deadline: block.timestamp
});
bytes memory sig = _signPermit(permit, address(vault), ownerKey);
vm.prank(owner);
vault.depositERC20(
IERC20(address(token)),
amount,
permit.nonce,
permit.deadline,
sig
);
vm.expectRevert();
vm.prank(_randomAddress());
vault.withdrawERC20(IERC20(address(token)), amount);
}
function test_cannotReenter() external {
IPermit2.PermitTransferFrom memory permit = IPermit2.PermitTransferFrom({
permitted: IPermit2.TokenPermissions({
token: IERC20(address(badToken)),
amount: 0
}),
nonce: _randomUint256(),
deadline: block.timestamp
});
bytes memory sig = _signPermit(permit, address(vault), ownerKey);
// Reenter by calling withdrawERC20() in transferFrom()
badToken.setReentrantCall(
address(vault),
abi.encodeCall(vault.withdrawERC20, (IERC20(address(badToken)), 0))
);
// Will manifest as a TRANSFER_FROM_FAILED
vm.expectRevert('TRANSFER_FROM_FAILED');
vm.prank(owner);
vault.depositERC20(
IERC20(address(badToken)),
0,
permit.nonce,
permit.deadline,
sig
);
}
// Generate a signature for a permit message.
function _signPermit(
IPermit2.PermitTransferFrom memory permit,
address spender,
uint256 signerKey
)
internal
returns (bytes memory sig)
{
(uint8 v, bytes32 r, bytes32 s) =
vm.sign(signerKey, _getEIP712Hash(permit, spender));
return abi.encodePacked(r, s, v);
}
// Compute the EIP712 hash of the permit object.
// Normally this would be implemented off-chain.
function _getEIP712Hash(IPermit2.PermitTransferFrom memory permit, address spender)
internal
view
returns (bytes32 h)
{
return keccak256(abi.encodePacked(
"\x19\x01",
permit2.DOMAIN_SEPARATOR(),
keccak256(abi.encode(
PERMIT_TRANSFER_FROM_TYPEHASH,
keccak256(abi.encode(
TOKEN_PERMISSIONS_TYPEHASH,
permit.permitted.token,
permit.permitted.amount
)),
spender,
permit.nonce,
permit.deadline
))
));
}
}
contract TestERC20 is ERC20 {
constructor() ERC20("Test", "TST", 18) {}
function mint(address owner, uint256 amount) external {
_mint(owner, amount);
}
}
contract ReenteringERC20 {
address _reentrantCallTarget;
bytes _reentrantCallData;
function setReentrantCall(address target, bytes calldata callData)
external
{
_reentrantCallTarget = target;
_reentrantCallData = callData;
}
function transferFrom(address, address, uint256) external returns (bool) {
(bool s, bytes memory r) = _reentrantCallTarget.call(_reentrantCallData);
if (!s) {
assembly { revert(add(r, 0x20), mload(r)) }
}
return true;
}
}
// Local bytecode clone of the canonical Permit2 contract deployed to mainnet.
contract Permit2Clone is IPermit2 {
error InvalidNonce();
error InvalidSigner();
constructor() {
// Deployed Permit2 bytecode at
// https://etherscan.io/address/0x000000000022D473030F116dDEE9F6B43aC78BA3
bytes memory bytecode = 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assembly { return(add(bytecode, 0x20), mload(bytecode)) }
}
///// STUBS /////
function DOMAIN_SEPARATOR() external view returns (bytes32) {}
function permitTransferFrom(
PermitTransferFrom calldata permit,
SignatureTransferDetails calldata transferDetails,
address owner,
bytes calldata signature
) external {}
}