feat(world-modules): callWithSignature chain id is salt (#2648)

Co-authored-by: Kevin Ingersoll <kingersoll@gmail.com>

.changeset/itchy-baboons-camp.md

@@ -0,0 +1,5 @@
+---
+"@latticexyz/world-modules": patch
+---
+
+Moved the chain ID in `CallWithSignature` from the `domain.chainId` to the `domain.salt` field to allow for cross-chain signing without requiring wallets to switch networks. The value of this field should be the chain on which the world lives, rather than the chain the wallet is connected to.

e2e/packages/sync-test/registerDelegationWithSignature.test.ts

@@ -6,7 +6,7 @@ import { deployContracts, startViteServer, startBrowserAndPage, openClientWithRo
 import { rpcHttpUrl } from "./setup/constants";
 import { waitForInitialSync } from "./data/waitForInitialSync";
 import { createBurnerAccount, resourceToHex, transportObserver } from "@latticexyz/common";
-import { http, createWalletClient, ClientConfig, encodeFunctionData } from "viem";
+import { http, createWalletClient, ClientConfig, encodeFunctionData, toHex } from "viem";
 import { mudFoundry } from "@latticexyz/common/chains";
 import { encodeEntity } from "@latticexyz/store-sync/recs";
 import { callPageFunction } from "./data/callPageFunction";
@@ -79,8 +79,8 @@ describe("callWithSignature", async () => {
     // Sign registration call message
     const signature = await delegatorWalletClient.signTypedData({
       domain: {
-        chainId: delegatorWalletClient.chain.id,
         verifyingContract: worldContract.address,
+        salt: toHex(delegatorWalletClient.chain.id, { size: 32 }),
       },
       types: callWithSignatureTypes,
       primaryType: "Call",

packages/world-modules/mud.config.ts

@@ -282,7 +282,7 @@ export default defineWorld({
       schema: { signer: "address", nonce: "uint256" },
       key: ["signer"],
       codegen: {
-        outputDirectory: "modules/delegation/tables",
+        outputDirectory: "modules/callwithsignature/tables",
       },
     },
   },

packages/world-modules/src/index.sol

@@ -22,4 +22,4 @@ import { Owners } from "./modules/erc721-puppet/tables/Owners.sol";
 import { TokenApproval } from "./modules/erc721-puppet/tables/TokenApproval.sol";
 import { OperatorApproval } from "./modules/erc721-puppet/tables/OperatorApproval.sol";
 import { ERC721Registry } from "./modules/erc721-puppet/tables/ERC721Registry.sol";
-import { CallWithSignatureNonces } from "./modules/delegation/tables/CallWithSignatureNonces.sol";
+import { CallWithSignatureNonces } from "./modules/callwithsignature/tables/CallWithSignatureNonces.sol";

packages/world-modules/src/modules/delegation/getSignedMessageHash.sol → packages/world-modules/src/modules/callwithsignature/getSignedMessageHash.sol

@@ -3,6 +3,10 @@ pragma solidity >=0.8.24;
 
 import { ResourceId } from "@latticexyz/store/src/ResourceId.sol";
 
+// Note the intended value of the `salt` field is the chain ID.
+// It is not included in `chainId`, to allow cross-chain signing without requiring wallets to switch networks.
+// The value of this field should be the chain on which the world lives, rather than the chain the wallet is connected to.
+bytes32 constant DOMAIN_TYPEHASH = keccak256("EIP712Domain(address verifyingContract,bytes32 salt)");
 bytes32 constant CALL_TYPEHASH = keccak256("Call(address signer,bytes32 systemId,bytes callData,uint256 nonce)");
 
 /**
@@ -23,9 +27,7 @@ function getSignedMessageHash(
   uint256 nonce,
   address worldAddress
 ) view returns (bytes32) {
-  bytes32 domainSeperator = keccak256(
-    abi.encode(keccak256("EIP712Domain(uint256 chainId,address verifyingContract)"), block.chainid, worldAddress)
-  );
+  bytes32 domainSeperator = keccak256(abi.encode(DOMAIN_TYPEHASH, worldAddress, bytes32(block.chainid)));
 
   return
     keccak256(

packages/world-modules/test/CallWithSignatureModule.t.sol

@@ -19,11 +19,11 @@ import { REGISTRATION_SYSTEM_ID } from "@latticexyz/world/src/modules/init/const
 import { createWorld } from "@latticexyz/world/test/createWorld.sol";
 import { WorldTestSystem } from "@latticexyz/world/test/World.t.sol";
 
-import { Unstable_CallWithSignatureModule } from "../src/modules/delegation/Unstable_CallWithSignatureModule.sol";
-import { Unstable_CallWithSignatureSystem } from "../src/modules/delegation/Unstable_CallWithSignatureSystem.sol";
-import { IUnstable_CallWithSignatureErrors } from "../src/modules/delegation/IUnstable_CallWithSignatureErrors.sol";
-import { getSignedMessageHash } from "../src/modules/delegation/getSignedMessageHash.sol";
-import { ECDSA } from "../src/modules/delegation/ECDSA.sol";
+import { Unstable_CallWithSignatureModule } from "../src/modules/callwithsignature/Unstable_CallWithSignatureModule.sol";
+import { Unstable_CallWithSignatureSystem } from "../src/modules/callwithsignature/Unstable_CallWithSignatureSystem.sol";
+import { IUnstable_CallWithSignatureErrors } from "../src/modules/callwithsignature/IUnstable_CallWithSignatureErrors.sol";
+import { getSignedMessageHash } from "../src/modules/callwithsignature/getSignedMessageHash.sol";
+import { ECDSA } from "../src/modules/callwithsignature/ECDSA.sol";
 
 contract Unstable_CallWithSignatureModuleTest is Test, GasReporter {
   using WorldResourceIdInstance for ResourceId;
@@ -104,7 +104,7 @@ contract Unstable_CallWithSignatureModuleTest is Test, GasReporter {
     vm.expectRevert(
       abi.encodeWithSelector(
         IUnstable_CallWithSignatureErrors.InvalidSignature.selector,
-        0x824E5E0aF3eA693b906527Dc41E4a29F037d515b
+        0x5266996Bb73ce3ac0E75D79Db87f4a96063cEe1F
       )
     );
     Unstable_CallWithSignatureSystem(address(world)).callWithSignature(