feat: not eoa

solidity/contracts/modules/finality/CallbackModule.sol

@@ -27,6 +27,7 @@ contract CallbackModule is Module, ICallbackModule {
     address _finalizer
   ) external override(Module, ICallbackModule) onlyOracle {
     RequestParameters memory _params = decodeRequestData(_request.finalityModuleData);
+
     _params.target.call(_params.data);
     emit Callback(_response.requestId, _params.target, _params.data);
     emit RequestFinalized(_response.requestId, _response, _finalizer);
@@ -35,11 +36,24 @@ contract CallbackModule is Module, ICallbackModule {
   /// @inheritdoc IModule
   function validateParameters(bytes calldata _encodedParameters)
     external
-    pure
+    view
     override(Module, IModule)
     returns (bool _valid)
   {
     RequestParameters memory _params = decodeRequestData(_encodedParameters);
-    _valid = address(_params.target) != address(0) && _params.data.length != 0;
+    _valid = address(_params.target) != address(0) && _params.data.length != 0 && _targetHasBytecode(_params.target);
+  }
+
+  /**
+   * @notice Checks if a target address has bytecode
+   * @param _target The address to check
+   * @return _hasBytecode Whether the target has bytecode or not
+   */
+  function _targetHasBytecode(address _target) private view returns (bool _hasBytecode) {
+    uint256 _size;
+    assembly {
+      _size := extcodesize(_target)
+    }
+    _hasBytecode = _size > 0;
   }
 }

solidity/contracts/modules/finality/MultipleCallbacksModule.sol

@@ -43,15 +43,15 @@ contract MultipleCallbacksModule is Module, IMultipleCallbacksModule {
   /// @inheritdoc IModule
   function validateParameters(bytes calldata _encodedParameters)
     external
-    pure
+    view
     override(Module, IModule)
     returns (bool _valid)
   {
     RequestParameters memory _params = decodeRequestData(_encodedParameters);
     _valid = true;
 
     for (uint256 _i; _i < _params.targets.length; ++_i) {
-      if (_params.targets[_i] == address(0)) {
+      if (_params.targets[_i] == address(0) || !_targetHasBytecode(_params.targets[_i])) {
         _valid = false;
         break;
       }
@@ -64,4 +64,17 @@ contract MultipleCallbacksModule is Module, IMultipleCallbacksModule {
       }
     }
   }
+
+  /**
+   * @notice Checks if a target address has bytecode
+   * @param _target The address to check
+   * @return _hasBytecode Whether the target has bytecode or not
+   */
+  function _targetHasBytecode(address _target) private view returns (bool _hasBytecode) {
+    uint256 _size;
+    assembly {
+      _size := extcodesize(_target)
+    }
+    _hasBytecode = _size > 0;
+  }
 }

solidity/test/integration/IntegrationBase.sol

@@ -42,7 +42,7 @@ import {TestConstants} from '../utils/TestConstants.sol';
 // solhint-enable no-unused-import
 
 contract IntegrationBase is DSTestPlus, TestConstants, Helpers {
-  uint256 public constant FORK_BLOCK = 100_000_000;
+  uint256 public constant FORK_BLOCK = 122_612_760;
 
   uint256 internal _initialBalance = 100_000 ether;
 

solidity/test/unit/modules/finality/CallbackModule.t.sol

@@ -31,6 +31,14 @@ contract BaseTest is Test, Helpers {
 
     callbackModule = new CallbackModule(oracle);
   }
+
+  function targetHasBytecode(address _target) public view returns (bool _hasBytecode) {
+    uint256 _size;
+    assembly {
+      _size := extcodesize(_target)
+    }
+    _hasBytecode = _size > 0;
+  }
 }
 
 contract CallbackModule_Unit_ModuleData is BaseTest {
@@ -60,7 +68,7 @@ contract CallbackModule_Unit_ModuleData is BaseTest {
    * @notice Test that the validateParameters function correctly checks the parameters
    */
   function test_validateParameters(ICallbackModule.RequestParameters calldata _params) public {
-    if (address(_params.target) == address(0) || _params.data.length == 0) {
+    if (address(_params.target) == address(0) || _params.data.length == 0 || !targetHasBytecode(_params.target)) {
       assertFalse(callbackModule.validateParameters(abi.encode(_params)));
     } else {
       assertTrue(callbackModule.validateParameters(abi.encode(_params)));
@@ -73,6 +81,7 @@ contract CallbackModule_Unit_FinalizeRequest is BaseTest {
    * @notice Test that finalizeRequest emits events
    */
   function test_emitsEvents(address _proposer, address _target, bytes calldata _data) public assumeFuzzable(_target) {
+    vm.etch(_target, '0xabcdef');
     mockRequest.finalityModuleData = abi.encode(ICallbackModule.RequestParameters({target: _target, data: _data}));
     mockResponse.requestId = _getId(mockRequest);
 

solidity/test/unit/modules/finality/MultipleCallbacksModule.t.sol

@@ -31,6 +31,14 @@ contract BaseTest is Test, Helpers {
 
     multipleCallbackModule = new MultipleCallbacksModule(oracle);
   }
+
+  function targetHasBytecode(address _target) public view returns (bool _hasBytecode) {
+    uint256 _size;
+    assembly {
+      _size := extcodesize(_target)
+    }
+    _hasBytecode = _size > 0;
+  }
 }
 
 /**
@@ -50,7 +58,7 @@ contract MultipleCallbacksModule_Unit_ModuleData is BaseTest {
   function test_validateParameters(IMultipleCallbacksModule.RequestParameters calldata _params) public {
     bool _valid = true;
     for (uint256 _i; _i < _params.targets.length; ++_i) {
-      if (_params.targets[_i] == address(0)) {
+      if (_params.targets[_i] == address(0) || !targetHasBytecode(_params.targets[_i])) {
         _valid = false;
       }
     }