Contract 0x548eadb11979d0bf6fbfbec6a0cb3a672fda31b6 9

// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

import { IAxelarGasService } from '../interfaces/IAxelarGasService.sol';
import { IERC20 } from '../interfaces/IERC20.sol';
import '../util/Upgradable.sol';

// This should be owned by the microservice that is paying for gas.
contract AxelarGasService is Upgradable, IAxelarGasService {
    address public immutable gasCollector;

    constructor(address gasCollector_) {
        gasCollector = gasCollector_;
    }

    modifier onlyCollector() {
        if (msg.sender != gasCollector) revert NotCollector();

        _;
    }

    // This is called on the source chain before calling the gateway to execute a remote contract.
    function payGasForContractCall(
        address sender,
        string calldata destinationChain,
        string calldata destinationAddress,
        bytes calldata payload,
        address gasToken,
        uint256 gasFeeAmount,
        address refundAddress
    ) external override {
        _safeTransferFrom(gasToken, msg.sender, gasFeeAmount);

        emit GasPaidForContractCall(
            sender,
            destinationChain,
            destinationAddress,
            keccak256(payload),
            gasToken,
            gasFeeAmount,
            refundAddress
        );
    }

    // This is called on the source chain before calling the gateway to execute a remote contract.
    function payGasForContractCallWithToken(
        address sender,
        string calldata destinationChain,
        string calldata destinationAddress,
        bytes calldata payload,
        string memory symbol,
        uint256 amount,
        address gasToken,
        uint256 gasFeeAmount,
        address refundAddress
    ) external override {
        _safeTransferFrom(gasToken, msg.sender, gasFeeAmount);

        emit GasPaidForContractCallWithToken(
            sender,
            destinationChain,
            destinationAddress,
            keccak256(payload),
            symbol,
            amount,
            gasToken,
            gasFeeAmount,
            refundAddress
        );
    }

    // This is called on the source chain before calling the gateway to execute a remote contract.
    function payNativeGasForContractCall(
        address sender,
        string calldata destinationChain,
        string calldata destinationAddress,
        bytes calldata payload,
        address refundAddress
    ) external payable override {
        if (msg.value == 0) revert NothingReceived();

        emit NativeGasPaidForContractCall(sender, destinationChain, destinationAddress, keccak256(payload), msg.value, refundAddress);
    }

    // This is called on the source chain before calling the gateway to execute a remote contract.
    function payNativeGasForContractCallWithToken(
        address sender,
        string calldata destinationChain,
        string calldata destinationAddress,
        bytes calldata payload,
        string calldata symbol,
        uint256 amount,
        address refundAddress
    ) external payable override {
        if (msg.value == 0) revert NothingReceived();

        emit NativeGasPaidForContractCallWithToken(
            sender,
            destinationChain,
            destinationAddress,
            keccak256(payload),
            symbol,
            amount,
            msg.value,
            refundAddress
        );
    }

    function addGas(
        bytes32 txHash,
        uint256 logIndex,
        address gasToken,
        uint256 gasFeeAmount,
        address refundAddress
    ) external override {
        _safeTransferFrom(gasToken, msg.sender, gasFeeAmount);

        emit GasAdded(txHash, logIndex, gasToken, gasFeeAmount, refundAddress);
    }

    function addNativeGas(
        bytes32 txHash,
        uint256 logIndex,
        address refundAddress
    ) external payable override {
        if (msg.value == 0) revert NothingReceived();

        emit NativeGasAdded(txHash, logIndex, msg.value, refundAddress);
    }

    function collectFees(
        address payable receiver,
        address[] calldata tokens,
        uint256[] calldata amounts
    ) external onlyCollector {
        // if (receiver == address(0)) revert InvalidAddress();

        uint256 tokensLength = tokens.length;
        if (tokensLength != amounts.length) revert InvalidAmounts();

        for (uint256 i; i < tokensLength; i++) {
            address token = tokens[i];
            uint256 amount = amounts[i];
            if (amount == 0) revert InvalidAmounts();

            if (token == address(0)) {
                if (amount <= address(this).balance) receiver.transfer(amount);
            } else {
                if (amount <= IERC20(token).balanceOf(address(this))) _safeTransfer(token, receiver, amount);
            }
        }
    }

    function refund(
        address payable receiver,
        address token,
        uint256 amount
    ) external onlyCollector {
        if (receiver == address(0)) revert InvalidAddress();

        if (token == address(0)) {
            receiver.transfer(amount);
        } else {
            _safeTransfer(token, receiver, amount);
        }
    }

    function _safeTransfer(
        address tokenAddress,
        address receiver,
        uint256 amount
    ) internal {
        if (amount == 0) revert NothingReceived();

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returnData) = tokenAddress.call(abi.encodeWithSelector(IERC20.transfer.selector, receiver, amount));
        bool transferred = success && (returnData.length == uint256(0) || abi.decode(returnData, (bool)));

        if (!transferred || tokenAddress.code.length == 0) revert TransferFailed();
    }

    function _safeTransferFrom(
        address tokenAddress,
        address from,
        uint256 amount
    ) internal {
        if (amount == 0) revert NothingReceived();

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returnData) = tokenAddress.call(
            abi.encodeWithSelector(IERC20.transferFrom.selector, from, address(this), amount)
        );
        bool transferred = success && (returnData.length == uint256(0) || abi.decode(returnData, (bool)));

        if (!transferred || tokenAddress.code.length == 0) revert TransferFailed();
    }

    function contractId() external pure returns (bytes32) {
        return keccak256('axelar-gas-service');
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.9;

import './IUpgradable.sol';

// This should be owned by the microservice that is paying for gas.
interface IAxelarGasService is IUpgradable {
    error NothingReceived();
    error TransferFailed();
    error InvalidAddress();
    error NotCollector();
    error InvalidAmounts();

    event GasPaidForContractCall(
        address indexed sourceAddress,
        string destinationChain,
        string destinationAddress,
        bytes32 indexed payloadHash,
        address gasToken,
        uint256 gasFeeAmount,
        address refundAddress
    );

    event GasPaidForContractCallWithToken(
        address indexed sourceAddress,
        string destinationChain,
        string destinationAddress,
        bytes32 indexed payloadHash,
        string symbol,
        uint256 amount,
        address gasToken,
        uint256 gasFeeAmount,
        address refundAddress
    );

    event NativeGasPaidForContractCall(
        address indexed sourceAddress,
        string destinationChain,
        string destinationAddress,
        bytes32 indexed payloadHash,
        uint256 gasFeeAmount,
        address refundAddress
    );

    event NativeGasPaidForContractCallWithToken(
        address indexed sourceAddress,
        string destinationChain,
        string destinationAddress,
        bytes32 indexed payloadHash,
        string symbol,
        uint256 amount,
        uint256 gasFeeAmount,
        address refundAddress
    );

    event GasAdded(bytes32 indexed txHash, uint256 indexed logIndex, address gasToken, uint256 gasFeeAmount, address refundAddress);

    event NativeGasAdded(bytes32 indexed txHash, uint256 indexed logIndex, uint256 gasFeeAmount, address refundAddress);

    // This is called on the source chain before calling the gateway to execute a remote contract.
    function payGasForContractCall(
        address sender,
        string calldata destinationChain,
        string calldata destinationAddress,
        bytes calldata payload,
        address gasToken,
        uint256 gasFeeAmount,
        address refundAddress
    ) external;

    // This is called on the source chain before calling the gateway to execute a remote contract.
    function payGasForContractCallWithToken(
        address sender,
        string calldata destinationChain,
        string calldata destinationAddress,
        bytes calldata payload,
        string calldata symbol,
        uint256 amount,
        address gasToken,
        uint256 gasFeeAmount,
        address refundAddress
    ) external;

    // This is called on the source chain before calling the gateway to execute a remote contract.
    function payNativeGasForContractCall(
        address sender,
        string calldata destinationChain,
        string calldata destinationAddress,
        bytes calldata payload,
        address refundAddress
    ) external payable;

    // This is called on the source chain before calling the gateway to execute a remote contract.
    function payNativeGasForContractCallWithToken(
        address sender,
        string calldata destinationChain,
        string calldata destinationAddress,
        bytes calldata payload,
        string calldata symbol,
        uint256 amount,
        address refundAddress
    ) external payable;

    function addGas(
        bytes32 txHash,
        uint256 txIndex,
        address gasToken,
        uint256 gasFeeAmount,
        address refundAddress
    ) external;

    function addNativeGas(
        bytes32 txHash,
        uint256 logIndex,
        address refundAddress
    ) external payable;

    function collectFees(
        address payable receiver,
        address[] calldata tokens,
        uint256[] calldata amounts
    ) external;

    function refund(
        address payable receiver,
        address token,
        uint256 amount
    ) external;

    function gasCollector() external returns (address);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.9;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    error InvalidAccount();

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;

import '../interfaces/IUpgradable.sol';

abstract contract Upgradable is IUpgradable {
    // bytes32(uint256(keccak256('eip1967.proxy.implementation')) - 1)
    bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
    // keccak256('owner')
    bytes32 internal constant _OWNER_SLOT = 0x02016836a56b71f0d02689e69e326f4f4c1b9057164ef592671cf0d37c8040c0;

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

    function owner() public view returns (address owner_) {
        // solhint-disable-next-line no-inline-assembly
        assembly {
            owner_ := sload(_OWNER_SLOT)
        }
    }

    function transferOwnership(address newOwner) external virtual onlyOwner {
        if (newOwner == address(0)) revert InvalidOwner();

        emit OwnershipTransferred(newOwner);
        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(_OWNER_SLOT, newOwner)
        }
    }

    function implementation() public view returns (address implementation_) {
        // solhint-disable-next-line no-inline-assembly
        assembly {
            implementation_ := sload(_IMPLEMENTATION_SLOT)
        }
    }

    function upgrade(
        address newImplementation,
        bytes32 newImplementationCodeHash,
        bytes calldata params
    ) external override onlyOwner {
        if (IUpgradable(newImplementation).contractId() != IUpgradable(this).contractId()) revert InvalidImplementation();
        if (newImplementationCodeHash != newImplementation.codehash) revert InvalidCodeHash();

        if (params.length > 0) {
            // solhint-disable-next-line avoid-low-level-calls
            (bool success, ) = newImplementation.delegatecall(abi.encodeWithSelector(this.setup.selector, params));

            if (!success) revert SetupFailed();
        }

        emit Upgraded(newImplementation);
        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(_IMPLEMENTATION_SLOT, newImplementation)
        }
    }

    function setup(bytes calldata data) external override {
        // Prevent setup from being called on the implementation
        if (implementation() == address(0)) revert NotProxy();

        _setup(data);
    }

    // solhint-disable-next-line no-empty-blocks
    function _setup(bytes calldata data) internal virtual {}
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.9;

// General interface for upgradable contracts
interface IUpgradable {
    error NotOwner();
    error InvalidOwner();
    error InvalidCodeHash();
    error InvalidImplementation();
    error SetupFailed();
    error NotProxy();

    event Upgraded(address indexed newImplementation);
    event OwnershipTransferred(address indexed newOwner);

    // Get current owner
    function owner() external view returns (address);

    function contractId() external pure returns (bytes32);

    function implementation() external view returns (address);

    function upgrade(
        address newImplementation,
        bytes32 newImplementationCodeHash,
        bytes calldata params
    ) external;

    function setup(bytes calldata data) external;
}

{
  "evmVersion": "london",
  "optimizer": {
    "enabled": true,
    "runs": 1000,
    "details": {
      "peephole": true,
      "inliner": true,
      "jumpdestRemover": true,
      "orderLiterals": true,
      "deduplicate": true,
      "cse": true,
      "constantOptimizer": true,
      "yul": true,
      "yulDetails": {
        "stackAllocation": true
      }
    }
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"txHash","type":"bytes32"},{"internalType":"uint256","name":"logIndex","type":"uint256"},{"internalType":"address","name":"refundAddress","type":"address"}],"name":"addNativeGas","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address payable","name":"receiver","type":"address"},{"internalType":"address[]","name":"tokens","type":"address[]"},{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"name":"collectFees","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"contractId","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"gasCollector","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"implementation","outputs":[{"internalType":"address","name":"implementation_","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"owner_","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"string","name":"destinationChain","type":"string"},{"internalType":"string","name":"destinationAddress","type":"string"},{"internalType":"bytes","name":"payload","type":"bytes"},{"internalType":"address","name":"gasToken","type":"address"},{"internalType":"uint256","name":"gasFeeAmount","type":"uint256"},{"internalType":"address","name":"refundAddress","type":"address"}],"name":"payGasForContractCall","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"string","name":"destinationChain","type":"string"},{"internalType":"string","name":"destinationAddress","type":"string"},{"internalType":"bytes","name":"payload","type":"bytes"},{"internalType":"string","name":"symbol","type":"string"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"address","name":"gasToken","type":"address"},{"internalType":"uint256","name":"gasFeeAmount","type":"uint256"},{"internalType":"address","name":"refundAddress","type":"address"}],"name":"payGasForContractCallWithToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"string","name":"destinationChain","type":"string"},{"internalType":"string","name":"destinationAddress","type":"string"},{"internalType":"bytes","name":"payload","type":"bytes"},{"internalType":"address","name":"refundAddress","type":"address"}],"name":"payNativeGasForContractCall","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"string","name":"destinationChain","type":"string"},{"internalType":"string","name":"destinationAddress","type":"string"},{"internalType":"bytes","name":"payload","type":"bytes"},{"internalType":"string","name":"symbol","type":"string"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"address","name":"refundAddress","type":"address"}],"name":"payNativeGasForContractCallWithToken","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address payable","name":"receiver","type":"address"},{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"refund","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes","name":"data","type":"bytes"}],"name":"setup","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newImplementation","type":"address"},{"internalType":"bytes32","name":"newImplementationCodeHash","type":"bytes32"},{"internalType":"bytes","name":"params","type":"bytes"}],"name":"upgrade","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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000000000000000000000000b8cd93c83a974649d76b1c19f311f639e62272bc

-----Decoded View---------------
Arg [0] : gasCollector_ (address): 0xB8Cd93C83A974649D76B1c19f311f639e62272BC

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000b8cd93c83a974649d76b1c19f311f639e62272bc