Add test paymaster contract

contracts/eip712/IAccount.sol

@@ -1,8 +1,8 @@
 // SPDX-License-Identifier: MIT
 
-pragma solidity 0.8.20;
+pragma solidity ^0.8.20;
 
-import "../libraries/TransactionHelper.sol";
+import "./TransactionHelper.sol";
 
 bytes4 constant ACCOUNT_VALIDATION_SUCCESS_MAGIC = IAccount.validateTransaction.selector;
 

contracts/eip712/IPaymaster.sol

@@ -1,8 +1,8 @@
 // SPDX-License-Identifier: MIT
 
-pragma solidity 0.8.20;
+pragma solidity ^0.8.20;
 
-import "../libraries/TransactionHelper.sol";
+import "./TransactionHelper.sol";
 
 enum ExecutionResult {
     Revert,
@@ -17,6 +17,7 @@ interface IPaymaster {
     /// address.
     /// @param _txHash The hash of the transaction
     /// @param _suggestedSignedHash The hash of the transaction that is signed by an EOA
+    /// @param _authenticationSignature The authorization proof signed by an EOA, can be used as a verifiable shortcut
     /// @param _transaction The transaction itself.
     /// @return magic The value that should be equal to the signature of the validateAndPayForPaymasterTransaction
     /// if the paymaster agrees to pay for the transaction.
@@ -28,6 +29,7 @@ interface IPaymaster {
     function validateAndPayForPaymasterTransaction(
         bytes32 _txHash,
         bytes32 _suggestedSignedHash,
+        bytes memory _authenticationSignature,
         Transaction calldata _transaction
     ) external payable returns (bytes4 magic, bytes memory context);
 

contracts/eip712/IPaymasterFlow.sol

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: MIT
 
-pragma solidity 0.8.20;
+pragma solidity ^0.8.20;
 
 /**
  * @author Matter Labs

contracts/eip712/TestPaymaster.sol

@@ -0,0 +1,51 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+import "./IPaymaster.sol";
+import "../libraries/EIP712.sol";
+import "../libraries/ECDSA.sol";
+
+contract TestPaymaster is IPaymaster, EIP712 {
+    struct SignData {
+        bytes32 suggestedSignedHash;
+    }
+
+    address public owner;
+
+    constructor(string memory name, string memory version) EIP712(name, version) {
+        owner = msg.sender;
+    }
+
+    function signDataTypeHash() internal pure returns (bytes32) {
+        return keccak256("SignData(bytes32 suggestedSignedHash)");
+    }
+
+    function signDataMessage(bytes32 suggestedSignedHash) internal view returns (bytes32) {
+        return ECDSA.toTypedDataHash(_domainSeparatorV4(), keccak256(abi.encode(
+            signDataTypeHash(),
+            suggestedSignedHash
+        )));
+    }
+
+    function validateAndPayForPaymasterTransaction(
+        bytes32 _txHash,
+        bytes32 _suggestedSignedHash,
+        bytes memory _authenticationSignature,
+        Transaction calldata _transaction
+    ) external payable returns (bytes4 magic, bytes memory context) {
+        address recoverAddress = ECDSA.recover(signDataMessage(_suggestedSignedHash), _authenticationSignature);
+        require(recoverAddress == owner, "Paymaster: Unauthorized signature");
+        return (PAYMASTER_VALIDATION_SUCCESS_MAGIC, context);
+    }
+
+    function postTransaction(
+        bytes calldata _context,
+        Transaction calldata _transaction,
+        bytes32 _txHash,
+        bytes32 _suggestedSignedHash,
+        ExecutionResult _txResult,
+        uint256 _maxRefundedGas
+    ) external payable {
+
+    }
+}