feat(cheatcodes): add ens namehash cheatcode (foundry-rs#7882)

* feat(cheatcodes): add ens namehash cheatcode

* fix test

* fix test

* rename the cheatcode from namehash -> ensNamehash

* update cheatcodes.json

crates/cheatcodes/spec/src/vm.rs

@@ -2135,6 +2135,10 @@ interface Vm {
     /// Encodes a `string` value to a base64url string.
     #[cheatcode(group = Utilities)]
     function toBase64URL(string calldata data) external pure returns (string memory);
+
+    /// Returns ENS namehash for provided string.
+    #[cheatcode(group = Utilities)]
+    function ensNamehash(string calldata name) external pure returns (bytes32);
 }
 }
 

crates/cheatcodes/src/utils.rs

@@ -11,6 +11,7 @@ use alloy_signer_wallet::{
     LocalWallet, MnemonicBuilder,
 };
 use alloy_sol_types::SolValue;
+use foundry_common::ens::namehash;
 use foundry_evm_core::constants::DEFAULT_CREATE2_DEPLOYER;
 use k256::{
     ecdsa::SigningKey,
@@ -137,6 +138,13 @@ impl Cheatcode for computeCreate2Address_1Call {
     }
 }
 
+impl Cheatcode for ensNamehashCall {
+    fn apply(&self, _state: &mut Cheatcodes) -> Result {
+        let Self { name } = self;
+        Ok(namehash(name).abi_encode())
+    }
+}
+
 /// Using a given private key, return its public ETH address, its public key affine x and y
 /// coordinates, and its private key (see the 'Wallet' struct)
 ///

testdata/default/cheats/EnsNamehash.t.sol

@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: MIT OR Apache-2.0
+pragma solidity 0.8.18;
+
+import "ds-test/test.sol";
+import "cheats/Vm.sol";
+
+contract EnsNamehashTest is DSTest {
+    Vm constant vm = Vm(HEVM_ADDRESS);
+
+    function testEnsNamehash() public {
+        assertEq(vm.ensNamehash(""), 0x0000000000000000000000000000000000000000000000000000000000000000);
+        assertEq(vm.ensNamehash("eth"), 0x93cdeb708b7545dc668eb9280176169d1c33cfd8ed6f04690a0bcc88a93fc4ae);
+        assertEq(vm.ensNamehash("foo.eth"), 0xde9b09fd7c5f901e23a3f19fecc54828e9c848539801e86591bd9801b019f84f);
+    }
+}