Update examples

.vscode/settings.json

@@ -1,5 +1,5 @@
 {
-  "solidity.compileUsingRemoteVersion": "v0.8.24+commit.e11b9ed9",
+  "solidity.compileUsingRemoteVersion": "v0.8.26+commit.8a97fa7a",
   "editor.formatOnSave": true,
   "[solidity]": {
     "editor.defaultFormatter": "JuanBlanco.solidity"

foundry.toml

@@ -1,14 +1,15 @@
 [profile.default]
 src = "src"
 out = "out"
-solc = "0.8.24"
+solc = "0.8.26"
 bytecode_hash = "none"
 optimizer = true
 optimizer_runs = 200
 build_info = true
 extra_output = ["storageLayout"]
 auto_detect_remappings = true
 gas_reports = ["*"]
+via_ir = true
 
 [fmt]
 bracket_spacing = true

hardhat.config.ts

@@ -19,7 +19,7 @@ const config: HardhatUserConfig = {
     solidity: {
         compilers: [
             {
-                version: '0.8.24',
+                version: '0.8.26',
                 settings: {
                     optimizer: {
                         enabled: true,

src/02-schema-hook/WhitelistHook.sol

@@ -0,0 +1,80 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.26;
+
+import { Ownable } from "@openzeppelin/contracts/access/Ownable.sol";
+import { IERC20 } from "@openzeppelin/contracts/interfaces/IERC20.sol";
+import { ISPHook } from "@ethsign/sign-protocol-evm/src/interfaces/ISPHook.sol";
+
+// @dev This contract manages the whitelist. We are separating the whitelist logic from the hook to make things easier
+// to read.
+contract WhitelistMananger is Ownable {
+    mapping(address attester => bool allowed) public whitelist;
+
+    error UnauthorizedAttester();
+
+    constructor() Ownable(_msgSender()) { }
+
+    function setWhitelist(address attester, bool allowed) external onlyOwner {
+        whitelist[attester] = allowed;
+    }
+
+    function _checkAttesterWhitelistStatus(address attester) internal view {
+        // solhint-disable-next-line custom-errors
+        require(whitelist[attester], UnauthorizedAttester());
+    }
+}
+
+// @dev This contract implements the actual schema hook.
+contract WhitelistHook is ISPHook, WhitelistMananger {
+    function didReceiveAttestation(
+        address attester,
+        uint64, // schemaId
+        uint64, // attestationId
+        bytes calldata // extraData
+    )
+        external
+        payable
+    {
+        _checkAttesterWhitelistStatus(attester);
+    }
+
+    function didReceiveAttestation(
+        address attester,
+        uint64, // schemaId
+        uint64, // attestationId
+        IERC20, // resolverFeeERC20Token
+        uint256, // resolverFeeERC20Amount
+        bytes calldata // extraData
+    )
+        external
+        view
+    {
+        _checkAttesterWhitelistStatus(attester);
+    }
+
+    function didReceiveRevocation(
+        address attester,
+        uint64, // schemaId
+        uint64, // attestationId
+        bytes calldata // extraData
+    )
+        external
+        payable
+    {
+        _checkAttesterWhitelistStatus(attester);
+    }
+
+    function didReceiveRevocation(
+        address attester,
+        uint64, // schemaId
+        uint64, // attestationId
+        IERC20, // resolverFeeERC20Token
+        uint256, // resolverFeeERC20Amount
+        bytes calldata // extraData
+    )
+        external
+        view
+    {
+        _checkAttesterWhitelistStatus(attester);
+    }
+}