Add support for signing EIP-712 typed data

script/universal/MultisigDeploy.sol

@@ -135,7 +135,7 @@ contract MultisigDeployScript is Script {
             console.log("  Salt Nonce:", saltNonce);
 
             // Resolve owner addresses (combine direct owners + referenced safe addresses)
-            address[] memory resolvedOwners = resolveOwnerAddresses(config, safes);
+            address[] memory resolvedOwners = resolveOwnerAddresses(config);
 
             console.log("  Total Owners:", resolvedOwners.length);
             console.log("  Direct Owners:", config.owners.length);
@@ -186,11 +186,7 @@ contract MultisigDeployScript is Script {
         }
     }
 
-    function resolveOwnerAddresses(SafeWallet memory config, SafeWallet[] memory safes)
-        internal
-        view
-        returns (address[] memory)
-    {
+    function resolveOwnerAddresses(SafeWallet memory config) internal view returns (address[] memory) {
         uint256 totalOwners = config.owners.length + config.ownerRefIndices.length;
         address[] memory resolved = new address[](totalOwners);
 

script/universal/MultisigScript.sol

@@ -6,6 +6,7 @@ import {console} from "forge-std/console.sol";
 import {Script} from "forge-std/Script.sol";
 import {IMulticall3} from "forge-std/interfaces/IMulticall3.sol";
 import {Vm} from "forge-std/Vm.sol";
+import {stdJson} from "forge-std/StdJson.sol";
 
 import {IGnosisSafe, Enum} from "./IGnosisSafe.sol";
 import {Signatures} from "./Signatures.sol";
@@ -332,7 +333,7 @@ abstract contract MultisigScript is Script {
         return safes;
     }
 
-    function _transactionDatas(address[] memory _safes) private view returns (bytes[] memory datas, uint256 value) {
+    function _transactionDatas(address[] memory _safes) internal view returns (bytes[] memory datas, uint256 value) {
         // Build the calls and sum the values
         IMulticall3.Call3Value[] memory calls = _buildCalls();
         for (uint256 i = 0; i < calls.length; i++) {
@@ -375,7 +376,8 @@ abstract contract MultisigScript is Script {
     }
 
     function _printDataToSign(address _safe, bytes memory _data, uint256 _value) internal {
-        bytes memory txData = _encodeTransactionData(_safe, _data, _value);
+        bytes memory txData =
+            _printDataHashes() ? _encodeTransactionData(_safe, _data, _value) : _encodeEIP712Json(_safe, _data, _value);
         bytes32 hash = _getTransactionHash(_safe, _data, _value);
 
         emit DataToSign(txData);
@@ -397,6 +399,14 @@ abstract contract MultisigScript is Script {
         console.log("###############################");
     }
 
+    // Controls whether the safe tx is printed as structured EIP-712 data, or just hashes.
+    //
+    // If you want to print and sign hashed EIP-712 data (domain + message hash) rather than the
+    // typed EIP-712 data struct, override this function and return `true`.
+    function _printDataHashes() internal view virtual returns (bool) {
+        return false;
+    }
+
     function _executeTransaction(
         address _safe,
         bytes memory _data,
@@ -566,6 +576,39 @@ abstract contract MultisigScript is Script {
         });
     }
 
+    function _encodeEIP712Json(address _safe, bytes memory _data, uint256 _value) internal returns (bytes memory) {
+        string memory types = '{"EIP712Domain":[' '{"name":"chainId","type":"uint256"},'
+            '{"name":"verifyingContract","type":"address"}],' '"SafeTx":[' '{"name":"to","type":"address"},'
+            '{"name":"value","type":"uint256"},' '{"name":"data","type":"bytes"},'
+            '{"name":"operation","type":"uint8"},' '{"name":"safeTxGas","type":"uint256"},'
+            '{"name":"baseGas","type":"uint256"},' '{"name":"gasPrice","type":"uint256"},'
+            '{"name":"gasToken","type":"address"},' '{"name":"refundReceiver","type":"address"},'
+            '{"name":"nonce","type":"uint256"}]}';
+
+        string memory domain = stdJson.serialize("domain", "chainId", uint256(block.chainid));
+        domain = stdJson.serialize("domain", "verifyingContract", address(_safe));
+
+        string memory message = stdJson.serialize("message", "to", MULTICALL3_ADDRESS);
+        message = stdJson.serialize("message", "value", _value);
+        message = stdJson.serialize("message", "data", _data);
+        message = stdJson.serialize(
+            "message", "operation", uint256(_value == 0 ? Enum.Operation.DelegateCall : Enum.Operation.Call)
+        );
+        message = stdJson.serialize("message", "safeTxGas", uint256(0));
+        message = stdJson.serialize("message", "baseGas", uint256(0));
+        message = stdJson.serialize("message", "gasPrice", uint256(0));
+        message = stdJson.serialize("message", "gasToken", address(0));
+        message = stdJson.serialize("message", "refundReceiver", address(0));
+        message = stdJson.serialize("message", "nonce", _getNonce(_safe));
+
+        string memory json = stdJson.serialize("", "primaryType", string("SafeTx"));
+        json = stdJson.serialize("", "types", types);
+        json = stdJson.serialize("", "domain", domain);
+        json = stdJson.serialize("", "message", message);
+
+        return abi.encodePacked(json);
+    }
+
     function _execTransactionCalldata(address _safe, bytes memory _data, uint256 _value, bytes memory _signatures)
         internal
         pure

test/universal/DoubleNestedMultisigBuilder.t.sol

@@ -77,6 +77,10 @@ contract DoubleNestedMultisigBuilderTest is Test, DoubleNestedMultisigBuilder {
         return safe4;
     }
 
+    function _printDataHashes() internal view override returns (bool) {
+        return true;
+    }
+
     function test_sign_double_nested_safe1() external {
         vm.recordLogs();
         bytes memory txData = abi.encodeCall(DoubleNestedMultisigBuilder.sign, (safe1, safe3));

test/universal/MultisigBuilder.t.sol

@@ -20,6 +20,7 @@ contract MultisigBuilderTest is Test, MultisigBuilder {
     Counter internal counter = new Counter(address(safe));
 
     function () internal view returns (IMulticall3.Call3Value[] memory) buildCallsInternal;
+    function () internal view returns (bool) printDataHashesInternal = printDataHashesEnabled;
 
     bytes internal dataToSignNoValue =
     // solhint-disable-next-line max-line-length
@@ -29,6 +30,10 @@ contract MultisigBuilderTest is Test, MultisigBuilder {
     // solhint-disable-next-line max-line-length
         hex"1901d4bb33110137810c444c1d9617abe97df097d587ecde64e6fcb38d7f49e1280cd150dbb03d4bb38e5325a914ff3861da880437fd5856c0f7e39054e64e05aed0";
 
+    string internal dataToSignTyped =
+    // solhint-disable-next-line max-line-length
+        '{"domain":{"chainId":31337,"verifyingContract":"0x00000000000000000000000000000000000003e9"},"message":{"baseGas":0,"data":"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","gasPrice":0,"gasToken":"0x0000000000000000000000000000000000000000","nonce":0,"operation":1,"refundReceiver":"0x0000000000000000000000000000000000000000","safeTxGas":0,"to":"0xcA11bde05977b3631167028862bE2a173976CA11","value":0},"primaryType":"SafeTx","types":{"EIP712Domain":[{"name":"chainId","type":"uint256"},{"name":"verifyingContract","type":"address"}],"SafeTx":[{"name":"to","type":"address"},{"name":"value","type":"uint256"},{"name":"data","type":"bytes"},{"name":"operation","type":"uint8"},{"name":"safeTxGas","type":"uint256"},{"name":"baseGas","type":"uint256"},{"name":"gasPrice","type":"uint256"},{"name":"gasToken","type":"address"},{"name":"refundReceiver","type":"address"},{"name":"nonce","type":"uint256"}]}}';
+
     function setUp() public {
         vm.etch(safe, Preinstalls.getDeployedCode(Preinstalls.Safe_v130, block.chainid));
         vm.etch(Preinstalls.MultiCall3, Preinstalls.getDeployedCode(Preinstalls.MultiCall3, block.chainid));
@@ -54,6 +59,10 @@ contract MultisigBuilderTest is Test, MultisigBuilder {
         return address(safe);
     }
 
+    function _printDataHashes() internal view override returns (bool) {
+        return printDataHashesInternal();
+    }
+
     function test_sign_no_value() external {
         buildCallsInternal = _buildCallsNoValue;
 
@@ -78,6 +87,19 @@ contract MultisigBuilderTest is Test, MultisigBuilder {
         assertEq(keccak256(logs[logs.length - 1].data), keccak256(abi.encode(dataToSignWithValue)));
     }
 
+    function test_sign_typed_data() external {
+        buildCallsInternal = _buildCallsNoValue;
+        printDataHashesInternal = printDataHashesDisabled;
+
+        vm.recordLogs();
+        bytes memory txData = abi.encodeCall(MultisigBuilder.sign, ());
+        vm.prank(wallet1.addr);
+        (bool success,) = address(this).call(txData);
+        vm.assertTrue(success);
+        Vm.Log[] memory logs = vm.getRecordedLogs();
+        assertEq(keccak256(logs[logs.length - 1].data), keccak256(abi.encode(dataToSignTyped)));
+    }
+
     function test_run() external {
         buildCallsInternal = _buildCallsNoValue;
         (uint8 v1, bytes32 r1, bytes32 s1) = vm.sign(wallet1, keccak256(dataToSignNoValue));
@@ -111,4 +133,12 @@ contract MultisigBuilderTest is Test, MultisigBuilder {
 
         return calls;
     }
+
+    function printDataHashesEnabled() internal pure returns (bool) {
+        return true;
+    }
+
+    function printDataHashesDisabled() internal pure returns (bool) {
+        return false;
+    }
 }

test/universal/NestedMultisigBuilder.t.sol

@@ -71,6 +71,10 @@ contract NestedMultisigBuilderTest is Test, NestedMultisigBuilder {
         return address(safe3);
     }
 
+    function _printDataHashes() internal view override returns (bool) {
+        return true;
+    }
+
     function test_sign_safe1() external {
         vm.recordLogs();
         bytes memory txData = abi.encodeCall(NestedMultisigBuilder.sign, (safe1));