Checkout plugin and proxy

.gitmodules

@@ -22,3 +22,6 @@
 [submodule "lib/dynamic-contracts"]
 	path = lib/dynamic-contracts
 	url = https://github.com/thirdweb-dev/dynamic-contracts
+[submodule "lib/prb-proxy"]
+	path = lib/prb-proxy
+	url = https://github.com/PaulRBerg/prb-proxy

contracts/prebuilts/unaudited/checkout/PluginCheckout.sol

@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: Apache-2.0
+pragma solidity ^0.8.11;
+
+//   $$\     $$\       $$\                 $$\                         $$\
+//   $$ |    $$ |      \__|                $$ |                        $$ |
+// $$$$$$\   $$$$$$$\  $$\  $$$$$$\   $$$$$$$ |$$\  $$\  $$\  $$$$$$\  $$$$$$$\
+// \_$$  _|  $$  __$$\ $$ |$$  __$$\ $$  __$$ |$$ | $$ | $$ |$$  __$$\ $$  __$$\
+//   $$ |    $$ |  $$ |$$ |$$ |  \__|$$ /  $$ |$$ | $$ | $$ |$$$$$$$$ |$$ |  $$ |
+//   $$ |$$\ $$ |  $$ |$$ |$$ |      $$ |  $$ |$$ | $$ | $$ |$$   ____|$$ |  $$ |
+//   \$$$$  |$$ |  $$ |$$ |$$ |      \$$$$$$$ |\$$$$$\$$$$  |\$$$$$$$\ $$$$$$$  |
+//    \____/ \__|  \__|\__|\__|       \_______| \_____\____/  \_______|\_______/
+
+import { IPRBProxyPlugin } from "@prb/proxy/src/interfaces/IPRBProxyPlugin.sol";
+
+import "./TargetCheckout.sol";
+
+contract PluginCheckout is IPRBProxyPlugin, TargetCheckout {
+    function getMethods() external pure override returns (bytes4[] memory) {
+        bytes4[] memory methods = new bytes4[](4);
+        methods[0] = this.withdraw.selector;
+        methods[1] = this.execute.selector;
+        methods[2] = this.swapAndExecute.selector;
+        methods[3] = this.approveSwapRouter.selector;
+        return methods;
+    }
+}

contracts/prebuilts/unaudited/checkout/TargetCheckout.sol

@@ -0,0 +1,82 @@
+// SPDX-License-Identifier: Apache-2.0
+pragma solidity ^0.8.11;
+
+import "../../../lib/CurrencyTransferLib.sol";
+import "../../../eip/interface/IERC20.sol";
+
+import { IPRBProxy } from "@prb/proxy/src/interfaces/IPRBProxy.sol";
+import "./interface/IPluginCheckout.sol";
+
+//   $$\     $$\       $$\                 $$\                         $$\
+//   $$ |    $$ |      \__|                $$ |                        $$ |
+// $$$$$$\   $$$$$$$\  $$\  $$$$$$\   $$$$$$$ |$$\  $$\  $$\  $$$$$$\  $$$$$$$\
+// \_$$  _|  $$  __$$\ $$ |$$  __$$\ $$  __$$ |$$ | $$ | $$ |$$  __$$\ $$  __$$\
+//   $$ |    $$ |  $$ |$$ |$$ |  \__|$$ /  $$ |$$ | $$ | $$ |$$$$$$$$ |$$ |  $$ |
+//   $$ |$$\ $$ |  $$ |$$ |$$ |      $$ |  $$ |$$ | $$ | $$ |$$   ____|$$ |  $$ |
+//   \$$$$  |$$ |  $$ |$$ |$$ |      \$$$$$$$ |\$$$$$\$$$$  |\$$$$$$$\ $$$$$$$  |
+//    \____/ \__|  \__|\__|\__|       \_______| \_____\____/  \_______|\_______/
+
+contract TargetCheckout is IPluginCheckout {
+    mapping(address => bool) public isApprovedRouter;
+
+    function withdraw(address _token, uint256 _amount) external {
+        require(msg.sender == IPRBProxy(address(this)).owner(), "Not authorized");
+
+        CurrencyTransferLib.transferCurrency(_token, address(this), msg.sender, _amount);
+    }
+
+    function approveSwapRouter(address _swapRouter, bool _toApprove) external {
+        require(msg.sender == IPRBProxy(address(this)).owner(), "Not authorized");
+        require(_swapRouter != address(0), "Zero address");
+
+        isApprovedRouter[_swapRouter] = _toApprove;
+    }
+
+    function execute(UserOp memory op) external {
+        require(_canExecute(op, msg.sender), "Not authorized");
+
+        _execute(op);
+    }
+
+    function swapAndExecute(UserOp memory op, UserOp memory swapOp) external {
+        require(isApprovedRouter[swapOp.target], "Invalid router address");
+        require(_canExecute(op, msg.sender), "Not authorized");
+
+        _execute(swapOp);
+        _execute(op);
+    }
+
+    // =================================================
+    // =============== Internal functions ==============
+    // =================================================
+
+    function _execute(UserOp memory op) internal {
+        bool success;
+        if (op.currency == CurrencyTransferLib.NATIVE_TOKEN) {
+            (success, ) = op.target.call{ value: op.valueToSend }(op.data);
+        } else {
+            if (op.valueToSend != 0 && op.approvalRequired) {
+                IERC20(op.currency).approve(op.target, op.valueToSend);
+            }
+
+            (success, ) = op.target.call(op.data);
+        }
+
+        require(success, "Execution failed");
+    }
+
+    function _canExecute(UserOp memory op, address caller) internal view returns (bool) {
+        address owner = IPRBProxy(address(this)).owner();
+        if (owner != caller) {
+            bool permission = IPRBProxy(address(this)).registry().getPermissionByOwner({
+                owner: owner,
+                envoy: caller,
+                target: op.target
+            });
+
+            return permission;
+        }
+
+        return true;
+    }
+}

contracts/prebuilts/unaudited/checkout/interface/IPluginCheckout.sol

@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: Apache-2.0
+pragma solidity ^0.8.11;
+
+interface IPluginCheckout {
+    /**
+     *  @notice Details of the transaction to execute on target contract.
+     *
+     *  @param target            Address to send the transaction to
+     *
+     *  @param currency          Represents both native token and erc20 token
+     *
+     *  @param approvalRequired  If need to approve erc20 to the target contract
+     *
+     *  @param valueToSend       Transaction value to send - both native and erc20
+     *
+     *  @param data              Transaction calldata
+     */
+    struct UserOp {
+        address target;
+        address currency;
+        bool approvalRequired;
+        uint256 valueToSend;
+        bytes data;
+    }
+
+    function execute(UserOp calldata op) external;
+
+    function swapAndExecute(UserOp calldata op, UserOp memory swapOp) external;
+}

foundry.toml

@@ -39,6 +39,7 @@ remappings = [
   'erc721a/=lib/ERC721A/',
   '@thirdweb-dev/dynamic-contracts/=lib/dynamic-contracts/',
   'lib/sstore2=lib/dynamic-contracts/lib/sstore2/',
+  '@prb/proxy/=lib/prb-proxy/',
 ]
 fs_permissions = [{ access = "read-write", path = "./src/test/smart-wallet/utils"}]
 src = 'contracts'