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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

// src/zksync/paymaster/SimplePaymaster.sol

struct Transaction {
    uint256 txType;
    uint256 from;
    uint256 to;
    uint256 gasLimit;
    uint256 gasPerPubdataByteLimit;
    uint256 maxFeePerGas;
    uint256 maxPriorityFeePerGas;
    uint256 paymaster;
    uint256 nonce;
    uint256 value;
    bytes data;
}

enum ExecutionResult {
    Revert,
    Success
}

interface IPaymaster {
    function validateAndPayForPaymasterTransaction(
        bytes32 _txHash,
        bytes32 _suggestedSignedHash,
        Transaction calldata _transaction
    ) external payable returns (bytes4 magic, bytes memory context);

    function postTransaction(
        bytes calldata _context,
        Transaction calldata _transaction,
        bytes32 _txHash,
        bytes32 _suggestedSignedHash,
        ExecutionResult _txResult,
        uint256 _maxRefundedGas
    ) external payable;
}

contract SimplePaymaster is IPaymaster {
    address constant BOOTLOADER_ADDRESS = address(uint160(0x8001));
    bytes4 constant PAYMASTER_VALIDATION_SUCCESS_MAGIC = IPaymaster.validateAndPayForPaymasterTransaction.selector;
    
    address public owner;
    
    error Unauthorized();
    error TransferFailed();

    modifier onlyOwner() {
        if (msg.sender != owner) {
            revert Unauthorized();
        }
        _;
    }

    constructor() {
        owner = msg.sender;
    }

    function validateAndPayForPaymasterTransaction(
        bytes32 _txHash,
        bytes32 _suggestedSignedHash,
        Transaction calldata _transaction
    ) external payable override returns (bytes4 magic, bytes memory context) {
        // Pay for transaction using call instead of send
        uint256 payment = _transaction.gasLimit * _transaction.maxFeePerGas;
        (bool success, ) = payable(BOOTLOADER_ADDRESS).call{value: payment}("");
        if (!success) {
            revert TransferFailed();
        }

        return (PAYMASTER_VALIDATION_SUCCESS_MAGIC, "");
    }

    function postTransaction(
        bytes calldata _context,
        Transaction calldata _transaction,
        bytes32 _txHash,
        bytes32 _suggestedSignedHash,
        ExecutionResult _txResult,
        uint256 _maxRefundedGas
    ) external payable override {
        // No post-transaction logic needed for this simple implementation
    }

    function withdraw(address payable _to, uint256 _amount) external onlyOwner {
        (bool success, ) = _to.call{value: _amount}("");
        if (!success) {
            revert TransferFailed();
        }
    }

    receive() external payable {}
}

{
  "viaIR": true,
  "codegen": "yul",
  "remappings": [
    "@openzeppelin/contracts/=lib/openzeppelin-contracts-upgradeable/lib/openzeppelin-contracts/contracts/",
    "@openzeppelin/contracts-upgradeable/=lib/openzeppelin-contracts-upgradeable/contracts/",
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "erc4626-tests/=lib/openzeppelin-contracts-upgradeable/lib/erc4626-tests/",
    "forge-std/=lib/forge-std/src/",
    "openzeppelin-contracts-upgradeable/=lib/openzeppelin-contracts-upgradeable/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/",
    "openzeppelin-foundry-upgrades/=lib/openzeppelin-foundry-upgrades/src/",
    "solidity-stringutils/=lib/openzeppelin-foundry-upgrades/lib/solidity-stringutils/",
    "@matterlabs/=lib/era-contracts/",
    "era-contracts/=lib/era-contracts/",
    "halmos-cheatcodes/=lib/openzeppelin-contracts-upgradeable/lib/halmos-cheatcodes/src/",
    "murky/=lib/era-contracts/lib/murky/",
    "openzeppelin-contracts-upgradeable-v4/=lib/era-contracts/lib/openzeppelin-contracts-upgradeable-v4/",
    "openzeppelin-contracts-v4/=lib/era-contracts/lib/openzeppelin-contracts-v4/"
  ],
  "evmVersion": "cancun",
  "outputSelection": {
    "*": {
      "*": [
        "abi",
        "metadata"
      ],
      "": [
        "ast"
      ]
    }
  },
  "optimizer": {
    "enabled": true,
    "mode": "3",
    "fallback_to_optimizing_for_size": false,
    "disable_system_request_memoization": true
  },
  "metadata": {},
  "libraries": {},
  "enableEraVMExtensions": false,
  "forceEVMLA": false
}

[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"TransferFailed","type":"error"},{"inputs":[],"name":"Unauthorized","type":"error"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes","name":"_context","type":"bytes"},{"components":[{"internalType":"uint256","name":"txType","type":"uint256"},{"internalType":"uint256","name":"from","type":"uint256"},{"internalType":"uint256","name":"to","type":"uint256"},{"internalType":"uint256","name":"gasLimit","type":"uint256"},{"internalType":"uint256","name":"gasPerPubdataByteLimit","type":"uint256"},{"internalType":"uint256","name":"maxFeePerGas","type":"uint256"},{"internalType":"uint256","name":"maxPriorityFeePerGas","type":"uint256"},{"internalType":"uint256","name":"paymaster","type":"uint256"},{"internalType":"uint256","name":"nonce","type":"uint256"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"internalType":"struct Transaction","name":"_transaction","type":"tuple"},{"internalType":"bytes32","name":"_txHash","type":"bytes32"},{"internalType":"bytes32","name":"_suggestedSignedHash","type":"bytes32"},{"internalType":"enum ExecutionResult","name":"_txResult","type":"uint8"},{"internalType":"uint256","name":"_maxRefundedGas","type":"uint256"}],"name":"postTransaction","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"_txHash","type":"bytes32"},{"internalType":"bytes32","name":"_suggestedSignedHash","type":"bytes32"},{"components":[{"internalType":"uint256","name":"txType","type":"uint256"},{"internalType":"uint256","name":"from","type":"uint256"},{"internalType":"uint256","name":"to","type":"uint256"},{"internalType":"uint256","name":"gasLimit","type":"uint256"},{"internalType":"uint256","name":"gasPerPubdataByteLimit","type":"uint256"},{"internalType":"uint256","name":"maxFeePerGas","type":"uint256"},{"internalType":"uint256","name":"maxPriorityFeePerGas","type":"uint256"},{"internalType":"uint256","name":"paymaster","type":"uint256"},{"internalType":"uint256","name":"nonce","type":"uint256"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"internalType":"struct Transaction","name":"_transaction","type":"tuple"}],"name":"validateAndPayForPaymasterTransaction","outputs":[{"internalType":"bytes4","name":"magic","type":"bytes4"},{"internalType":"bytes","name":"context","type":"bytes"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address payable","name":"_to","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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