From 897414289cea5e85c546424b32787cac21ba1762 Mon Sep 17 00:00:00 2001
From: Vectorized <webby1111@hotmail.com>
Date: Mon, 25 Mar 2024 04:07:00 +0000
Subject: [PATCH] T

---
 src/accounts/ERC1271InputGenerator.sol | 49 ++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 src/accounts/ERC1271InputGenerator.sol

diff --git a/src/accounts/ERC1271InputGenerator.sol b/src/accounts/ERC1271InputGenerator.sol
new file mode 100644
index 0000000000..ed40a46c73
--- /dev/null
+++ b/src/accounts/ERC1271InputGenerator.sol
@@ -0,0 +1,49 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.4;
+
+import {EIP712} from "../utils/EIP712.sol";
+import {SignatureCheckerLib} from "../utils/SignatureCheckerLib.sol";
+
+/// @notice Input hash helper for predeploy smart accounts using Solady ERC1271.
+/// @author Solady (https://github.com/vectorized/solady/blob/main/src/accounts/ERC1271InputGenerator.sol)
+/// @author Coinbase (https://github.com/coinbase/smart-wallet/blob/main/src/utils/ERC1271InputGenerator.sol)
+///
+/// @dev
+/// This contract is not meant to ever actually be deployed,
+/// only mock deployed and used via a static `eth_call`.
+///
+/// May be useful for generating ERC-6492 compliant signatures.
+/// Inspired by Ambire's DeploylessUniversalSigValidator
+/// (https://github.com/AmbireTech/signature-validator/blob/main/contracts/DeploylessUniversalSigValidator.sol)
+abstract contract ERC1271InputGenerator {
+    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
+    /*                       CUSTOM ERRORS                        */
+    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
+
+    /// @dev Account deployment via `accountFactory` with `factoryCalldata` failed.
+    error AccountDeploymentFailed();
+
+    /// @dev Account returned from call to `accountFactory` does not match passed account.
+    error ReturnedAddressDoesNotMatchAccount();
+
+    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
+    /*                ERC1271 INPUT HASH GENERATOR                */
+    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
+
+    constructor(
+        address account,
+        bytes32 hash,
+        bytes32 parentTypehash,
+        bytes32 child,
+        address accountFactory,
+        bytes memory factoryCalldata
+    ) {
+        /// @solidity memory-safe-assembly
+        assembly {
+            // If the account already exists, call `replaySafeHash` and return the result.
+            if extcodesize(account) {
+                // TODO.
+            }
+        }
+    }
+}