EVM: Add support for dynamic call intents

packages/evm/contracts/Intents.sol

@@ -2,18 +2,22 @@
 
 pragma solidity ^0.8.20;
 
+import './dynamic-calls/DynamicCallTypes.sol';
+
 /**
  * @dev Enum representing the operation type.
  * - Swap: Swap tokens in the same chain.
  * - Transfer: Transfer tokens to one or more recipients.
  * - Call: Execute arbitrary contract calls.
  * - CrossChainSwap: Swap tokens between chains.
+ * - DynamicCall: Execute arbitrary dynamic contract calls.
  */
 enum OpType {
     Swap,
     Transfer,
     Call,
-    CrossChainSwap
+    CrossChainSwap,
+    DynamicCall
 }
 
 /**
@@ -162,6 +166,16 @@ struct CallData {
     uint256 value;
 }
 
+/**
+ * @dev Represents a generic dynamic call operation consisting of one or more dynamic contract calls.
+ * @param chainId Chain ID where the calls should be executed.
+ * @param calls List of ABI-encoded low-level dynamic contract calls to be executed.
+ */
+struct DynamicCallOperation {
+    uint256 chainId;
+    bytes[] calls;
+}
+
 /**
  * @dev Generic proposal structure representing a solver’s response to an intent.
  * @param deadline Timestamp until when the proposal is valid.

packages/evm/contracts/Settler.sol

@@ -23,7 +23,9 @@ import '@openzeppelin/contracts/utils/cryptography/EIP712.sol';
 import '@openzeppelin/contracts/utils/introspection/ERC165Checker.sol';
 
 import './Intents.sol';
+import './dynamic-calls/DynamicCallEncoder.sol';
 import './interfaces/IController.sol';
+import './interfaces/IDynamicCallEncoder.sol';
 import './interfaces/IOperationsValidator.sol';
 import './interfaces/IExecutor.sol';
 import './interfaces/ISettler.sol';
@@ -53,6 +55,9 @@ contract Settler is ISettler, Ownable, ReentrancyGuard, EIP712 {
     // Operations validator reference
     address public override operationsValidator;
 
+    // Dynamic call encoder reference
+    address public dynamicCallEncoder;
+
     // List of block numbers at which an intent was executed
     mapping (bytes32 => uint256) public override getIntentBlock;
 
@@ -76,6 +81,7 @@ contract Settler is ISettler, Ownable, ReentrancyGuard, EIP712 {
     constructor(address _controller, address _owner) Ownable(_owner) EIP712('Mimic Protocol Settler', '1') {
         controller = _controller;
         smartAccountsHandler = address(new SmartAccountsHandler());
+        dynamicCallEncoder = address(new DynamicCallEncoder());
     }
 
     /**
@@ -145,6 +151,14 @@ contract Settler is ISettler, Ownable, ReentrancyGuard, EIP712 {
         _setOperationsValidator(newOperationsValidator);
     }
 
+    /**
+     * @dev Sets a new dynamic call encoder address
+     * @param newDynamicCallEncoder New dynamic call encoder to be set
+     */
+    function setDynamicCallEncoder(address newDynamicCallEncoder) external override onlyOwner {
+        _setDynamicCallEncoder(newDynamicCallEncoder);
+    }
+
     /**
      * @dev Sets a safeguard for a user
      * @param safeguard Safeguard to be set
@@ -199,25 +213,46 @@ contract Settler is ISettler, Ownable, ReentrancyGuard, EIP712 {
         _validateIntent(intent, proposal, signature, simulated);
         getIntentBlock[intent.hash()] = block.number;
 
+        bytes[][] memory outputs = new bytes[][](intent.operations.length);
         for (uint256 i = 0; i < intent.operations.length; i++) {
-            uint8 opType = intent.operations[i].opType;
-            if (opType == uint8(OpType.Swap) || opType == uint8(OpType.CrossChainSwap)) {
-                _executeSwap(intent, proposal, i);
-            } else if (opType == uint8(OpType.Transfer)) _executeTransfer(intent, proposal, i);
-            else if (opType == uint8(OpType.Call)) _executeCall(intent, proposal, i);
-            else revert SettlerUnknownOperationType(uint8(opType));
+            outputs[i] = _executeOperation(intent, proposal, i, outputs);
         }
+
         _payFees(intent, proposal);
         emit ProposalExecuted(proposal.hash(intent, _msgSender()));
     }
 
+    /**
+     * @dev Executes proposal to fulfill an operation
+     * @param intent Intent being fulfilled
+     * @param proposal Proposal being executed
+     * @param index Position where the operation and its corresponding proposal data are located
+     * @param outputs List of operations outputs
+     */
+    function _executeOperation(Intent memory intent, Proposal memory proposal, uint256 index, bytes[][] memory outputs)
+        internal
+        returns (bytes[] memory)
+    {
+        uint8 opType = intent.operations[index].opType;
+        if (opType == uint8(OpType.Swap) || opType == uint8(OpType.CrossChainSwap)) {
+            return _executeSwap(intent, proposal, index);
+        }
+        if (opType == uint8(OpType.Transfer)) return _executeTransfer(intent, proposal, index);
+        if (opType == uint8(OpType.Call)) return _executeCall(intent, proposal, index);
+        if (opType == uint8(OpType.DynamicCall)) return _executeDynamicCall(intent, proposal, index, outputs);
+        revert SettlerUnknownOperationType(opType);
+    }
+
     /**
      * @dev Validates and executes a proposal to fulfill a swap operation
      * @param intent Intent that contains swap operation to be fulfilled
      * @param proposal Proposal with swap data to be executed
      * @param index Position where the swap proposal data and operation are located
      */
-    function _executeSwap(Intent memory intent, Proposal memory proposal, uint256 index) internal {
+    function _executeSwap(Intent memory intent, Proposal memory proposal, uint256 index)
+        internal
+        returns (bytes[] memory outputs)
+    {
         Operation memory operation = intent.operations[index];
         SwapOperation memory swapOperation = abi.decode(operation.data, (SwapOperation));
         SwapProposal memory swapProposal = abi.decode(proposal.datas[index], (SwapProposal));
@@ -237,22 +272,24 @@ contract Settler is ISettler, Ownable, ReentrancyGuard, EIP712 {
         uint256[] memory preBalancesOut = _getTokensOutBalance(swapOperation);
         IExecutor(swapProposal.executor).execute(intent, proposal, index);
 
+        outputs = new bytes[](swapOperation.tokensOut.length);
         if (swapOperation.destinationChain == block.chainid) {
-            uint256[] memory outputs = new uint256[](swapOperation.tokensOut.length);
+            uint256[] memory amounts = new uint256[](swapOperation.tokensOut.length);
             for (uint256 i = 0; i < swapOperation.tokensOut.length; i++) {
                 TokenOut memory tokenOut = swapOperation.tokensOut[i];
                 uint256 postBalanceOut = ERC20Helpers.balanceOf(tokenOut.token, address(this));
                 uint256 preBalanceOut = preBalancesOut[i];
                 if (postBalanceOut < preBalanceOut) revert SettlerPostBalanceOutLtPre(i, postBalanceOut, preBalanceOut);
 
-                outputs[i] = postBalanceOut - preBalanceOut;
+                amounts[i] = postBalanceOut - preBalanceOut;
                 uint256 proposedAmount = swapProposal.amountsOut[i];
-                if (outputs[i] < proposedAmount) revert SettlerAmountOutLtProposed(i, outputs[i], proposedAmount);
+                if (amounts[i] < proposedAmount) revert SettlerAmountOutLtProposed(i, amounts[i], proposedAmount);
 
-                ERC20Helpers.transfer(tokenOut.token, tokenOut.recipient, outputs[i]);
+                ERC20Helpers.transfer(tokenOut.token, tokenOut.recipient, amounts[i]);
+                outputs[i] = abi.encode(amounts[i]);
             }
 
-            _emitOperationEvents(operation, proposal, intent.hash(), index, abi.encode(outputs));
+            _emitOperationEvents(operation, proposal, intent.hash(), index, abi.encode(amounts));
         }
     }
 
@@ -262,7 +299,10 @@ contract Settler is ISettler, Ownable, ReentrancyGuard, EIP712 {
      * @param proposal Transfer proposal to be executed
      * @param index Position where the trasnfer proposal data and operation are located
      */
-    function _executeTransfer(Intent memory intent, Proposal memory proposal, uint256 index) internal {
+    function _executeTransfer(Intent memory intent, Proposal memory proposal, uint256 index)
+        internal
+        returns (bytes[] memory outputs)
+    {
         Operation memory operation = intent.operations[index];
         TransferOperation memory transferOperation = abi.decode(operation.data, (TransferOperation));
         _validateTransferOperation(transferOperation, proposal.datas[index]);
@@ -273,6 +313,7 @@ contract Settler is ISettler, Ownable, ReentrancyGuard, EIP712 {
             _transferFrom(transfer.token, operation.user, transfer.recipient, transfer.amount, isSmartAccount);
         }
 
+        outputs = new bytes[](0);
         _emitOperationEvents(operation, proposal, intent.hash(), index, new bytes(0));
     }
 
@@ -282,12 +323,15 @@ contract Settler is ISettler, Ownable, ReentrancyGuard, EIP712 {
      * @param proposal Call proposal to be executed
      * @param index Position where the call proposal data and operation are located
      */
-    function _executeCall(Intent memory intent, Proposal memory proposal, uint256 index) internal {
+    function _executeCall(Intent memory intent, Proposal memory proposal, uint256 index)
+        internal
+        returns (bytes[] memory outputs)
+    {
         Operation memory operation = intent.operations[index];
         CallOperation memory callOperation = abi.decode(operation.data, (CallOperation));
         _validateCallOperation(callOperation, proposal.datas[index], operation.user);
 
-        bytes[] memory outputs = new bytes[](callOperation.calls.length);
+        outputs = new bytes[](callOperation.calls.length);
         for (uint256 i = 0; i < callOperation.calls.length; i++) {
             CallData memory call = callOperation.calls[i];
             // solhint-disable-next-line avoid-low-level-calls
@@ -297,6 +341,34 @@ contract Settler is ISettler, Ownable, ReentrancyGuard, EIP712 {
         _emitOperationEvents(operation, proposal, intent.hash(), index, abi.encode(outputs));
     }
 
+    /**
+     * @dev Validates and executes a proposal to fulfill a dynamic call operation
+     * @param intent Intent that contains dynamic call operation to be fulfilled
+     * @param proposal Dynamic call proposal to be executed
+     * @param index Position where the dynamic call proposal data and operation are located
+     * @param variables List of operations outputs
+     */
+    function _executeDynamicCall(
+        Intent memory intent,
+        Proposal memory proposal,
+        uint256 index,
+        bytes[][] memory variables
+    ) internal returns (bytes[] memory outputs) {
+        Operation memory operation = intent.operations[index];
+        DynamicCallOperation memory dynamicCallOperation = abi.decode(operation.data, (DynamicCallOperation));
+        _validateDynamicCallOperation(dynamicCallOperation, proposal.datas[index], operation.user);
+
+        outputs = new bytes[](dynamicCallOperation.calls.length);
+        for (uint256 i = 0; i < dynamicCallOperation.calls.length; i++) {
+            DynamicCall memory dynamicCall = abi.decode(dynamicCallOperation.calls[i], (DynamicCall));
+            bytes memory data = IDynamicCallEncoder(dynamicCallEncoder).encode(dynamicCall, variables, index);
+            // solhint-disable-next-line avoid-low-level-calls
+            outputs[i] = smartAccountsHandler.call(operation.user, dynamicCall.target, data, dynamicCall.value);
+        }
+
+        _emitOperationEvents(operation, proposal, intent.hash(), index, abi.encode(outputs));
+    }
+
     /**
      * @dev Validates an intent and its corresponding proposal
             The off-chain validators are assuring that:
@@ -427,6 +499,22 @@ contract Settler is ISettler, Ownable, ReentrancyGuard, EIP712 {
         if (!smartAccountsHandler.isSmartAccount(user)) revert SettlerUserNotSmartAccount(user);
     }
 
+    /**
+     * @dev Validates a dynamic call operation and its corresponding proposal
+     * @param operation Dynamic call operation to be fulfilled
+     * @param proposalData data of the proposal
+     * @param user The originator of the operation
+     */
+    function _validateDynamicCallOperation(
+        DynamicCallOperation memory operation,
+        bytes memory proposalData,
+        address user
+    ) internal view {
+        if (operation.chainId != block.chainid) revert SettlerInvalidChain(block.chainid);
+        if (proposalData.length > 0) revert SettlerProposalDataNotEmpty();
+        if (!smartAccountsHandler.isSmartAccount(user)) revert SettlerUserNotSmartAccount(user);
+    }
+
     /**
      * @dev Validates a cross-chain swap operation and its corresponding proposal
      * @param operation Swap operation to be fulfilled
@@ -556,6 +644,16 @@ contract Settler is ISettler, Ownable, ReentrancyGuard, EIP712 {
         emit OperationsValidatorSet(newOperationsValidator);
     }
 
+    /**
+     * @dev Sets the dynamic call encoder
+     * @param newDynamicCallEncoder New dynamic call encoder to be set
+     */
+    function _setDynamicCallEncoder(address newDynamicCallEncoder) internal {
+        if (newDynamicCallEncoder == address(0)) revert SettlerDynamicCallEncoderZero();
+        dynamicCallEncoder = newDynamicCallEncoder;
+        emit DynamicCallEncoderSet(newDynamicCallEncoder);
+    }
+
     /**
      * @dev Sets a safeguard for a user
      * @param user Address of the user to set the safeguard for