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PermitHash.sol
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PermitHash.sol
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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17;
import {IAllowanceTransfer} from "../interfaces/IAllowanceTransfer.sol";
import {ISignatureTransfer} from "../interfaces/ISignatureTransfer.sol";
library PermitHash {
bytes32 public constant _PERMIT_DETAILS_TYPEHASH =
keccak256("PermitDetails(address token,uint160 amount,uint48 expiration,uint48 nonce)");
bytes32 public constant _PERMIT_SINGLE_TYPEHASH = keccak256(
"PermitSingle(PermitDetails details,address spender,uint256 sigDeadline)PermitDetails(address token,uint160 amount,uint48 expiration,uint48 nonce)"
);
bytes32 public constant _PERMIT_BATCH_TYPEHASH = keccak256(
"PermitBatch(PermitDetails[] details,address spender,uint256 sigDeadline)PermitDetails(address token,uint160 amount,uint48 expiration,uint48 nonce)"
);
bytes32 public constant _TOKEN_PERMISSIONS_TYPEHASH = keccak256("TokenPermissions(address token,uint256 amount)");
bytes32 public constant _PERMIT_TRANSFER_FROM_TYPEHASH = keccak256(
"PermitTransferFrom(TokenPermissions permitted,address spender,uint256 nonce,uint256 deadline)TokenPermissions(address token,uint256 amount)"
);
bytes32 public constant _PERMIT_BATCH_TRANSFER_FROM_TYPEHASH = keccak256(
"PermitBatchTransferFrom(TokenPermissions[] permitted,address spender,uint256 nonce,uint256 deadline)TokenPermissions(address token,uint256 amount)"
);
string public constant _TOKEN_PERMISSIONS_TYPESTRING = "TokenPermissions(address token,uint256 amount)";
string public constant _PERMIT_TRANSFER_FROM_WITNESS_TYPEHASH_STUB =
"PermitWitnessTransferFrom(TokenPermissions permitted,address spender,uint256 nonce,uint256 deadline,";
string public constant _PERMIT_BATCH_WITNESS_TRANSFER_FROM_TYPEHASH_STUB =
"PermitBatchWitnessTransferFrom(TokenPermissions[] permitted,address spender,uint256 nonce,uint256 deadline,";
function hash(IAllowanceTransfer.PermitSingle memory permitSingle) internal pure returns (bytes32) {
bytes32 permitHash = _hashPermitDetails(permitSingle.details);
return
keccak256(abi.encode(_PERMIT_SINGLE_TYPEHASH, permitHash, permitSingle.spender, permitSingle.sigDeadline));
}
function hash(IAllowanceTransfer.PermitBatch memory permitBatch) internal pure returns (bytes32) {
uint256 numPermits = permitBatch.details.length;
bytes32[] memory permitHashes = new bytes32[](numPermits);
for (uint256 i = 0; i < numPermits; ++i) {
permitHashes[i] = _hashPermitDetails(permitBatch.details[i]);
}
return keccak256(
abi.encode(
_PERMIT_BATCH_TYPEHASH,
keccak256(abi.encodePacked(permitHashes)),
permitBatch.spender,
permitBatch.sigDeadline
)
);
}
function hash(ISignatureTransfer.PermitTransferFrom memory permit) internal view returns (bytes32) {
bytes32 tokenPermissionsHash = _hashTokenPermissions(permit.permitted);
return keccak256(
abi.encode(_PERMIT_TRANSFER_FROM_TYPEHASH, tokenPermissionsHash, msg.sender, permit.nonce, permit.deadline)
);
}
function hash(ISignatureTransfer.PermitBatchTransferFrom memory permit) internal view returns (bytes32) {
uint256 numPermitted = permit.permitted.length;
bytes32[] memory tokenPermissionHashes = new bytes32[](numPermitted);
for (uint256 i = 0; i < numPermitted; ++i) {
tokenPermissionHashes[i] = _hashTokenPermissions(permit.permitted[i]);
}
return keccak256(
abi.encode(
_PERMIT_BATCH_TRANSFER_FROM_TYPEHASH,
keccak256(abi.encodePacked(tokenPermissionHashes)),
msg.sender,
permit.nonce,
permit.deadline
)
);
}
function hashWithWitness(
ISignatureTransfer.PermitTransferFrom memory permit,
bytes32 witness,
string calldata witnessTypeString
) internal view returns (bytes32) {
bytes32 typeHash = keccak256(abi.encodePacked(_PERMIT_TRANSFER_FROM_WITNESS_TYPEHASH_STUB, witnessTypeString));
bytes32 tokenPermissionsHash = _hashTokenPermissions(permit.permitted);
return keccak256(abi.encode(typeHash, tokenPermissionsHash, msg.sender, permit.nonce, permit.deadline, witness));
}
function hashWithWitness(
ISignatureTransfer.PermitBatchTransferFrom memory permit,
bytes32 witness,
string calldata witnessTypeString
) internal view returns (bytes32) {
bytes32 typeHash =
keccak256(abi.encodePacked(_PERMIT_BATCH_WITNESS_TRANSFER_FROM_TYPEHASH_STUB, witnessTypeString));
uint256 numPermitted = permit.permitted.length;
bytes32[] memory tokenPermissionHashes = new bytes32[](numPermitted);
for (uint256 i = 0; i < numPermitted; ++i) {
tokenPermissionHashes[i] = _hashTokenPermissions(permit.permitted[i]);
}
return keccak256(
abi.encode(
typeHash,
keccak256(abi.encodePacked(tokenPermissionHashes)),
msg.sender,
permit.nonce,
permit.deadline,
witness
)
);
}
function _hashPermitDetails(IAllowanceTransfer.PermitDetails memory details) private pure returns (bytes32) {
return keccak256(abi.encode(_PERMIT_DETAILS_TYPEHASH, details));
}
function _hashTokenPermissions(ISignatureTransfer.TokenPermissions memory permitted)
private
pure
returns (bytes32)
{
return keccak256(abi.encode(_TOKEN_PERMISSIONS_TYPEHASH, permitted));
}
}