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pragma solidity 0.8.25;

import {IXDaiForeignBridge} from "../../interfaces/IXDaiForeignBridge.sol";
import {IERC20} from "../../interfaces/IERC20.sol";

interface IDaiUsds {
    function daiToUsds(address usr, uint256 wad) external;
    function usdsToDai(address usr, uint256 wad) external;
}

/// @title XDaiBridgePeripheralForUsdsPreUsdsUpgrade
/// @author Gnosis Chain's bridge team
/// @notice This contract acts as a transitional contract between BridgeRouter and xDAIForeignBridge contract before xDAIForeignBridge is upgraded to USDS as default
///          The functions in this contract are compatible with the XDaiBridgePeripheral contract that is used after xDAIForeignBridge USDS upgrade
/// @dev This contract is non upgradeable and only callable by BridgeRouter contract
contract XDaiBridgePeripheralForUsdsPreUsdsUpgrade {
    address public router;
    address public constant DAIUSDS = 0x3225737a9Bbb6473CB4a45b7244ACa2BeFdB276A;
    address public constant FOREIGN_XDAIBRIDGE = 0x4aa42145Aa6Ebf72e164C9bBC74fbD3788045016;
    address public constant USDS = 0xdC035D45d973E3EC169d2276DDab16f1e407384F;
    address public constant DAI = 0x6B175474E89094C44Da98b954EedeAC495271d0F;

    modifier onlyRouter() {
        require(msg.sender == router, "only Router");
        _;
    }

    constructor(address _router) {
        router = _router;
    }

    /// @notice call approve & relayTokens after swapping USDS to DAI
    /// @dev only callable by BridgeRouter
    /// @param receiver receiver of the xDAI token on Gnosis Chain
    /// @param amount amount of xDAI token received
    function relayTokens(address receiver, uint256 amount) external onlyRouter {
        // user bridge USDS
        IERC20(USDS).transferFrom(msg.sender, address(this), amount);

        // swap Usds to Dai
        IERC20(USDS).approve(DAIUSDS, amount);
        IDaiUsds(DAIUSDS).usdsToDai(address(this), amount);

        // call XDaibridge relayTokens
        IERC20(DAI).approve(FOREIGN_XDAIBRIDGE, amount);
        IXDaiForeignBridge(FOREIGN_XDAIBRIDGE).relayTokens(receiver, amount);
    }
}

pragma solidity 0.8.25;

interface IXDaiForeignBridge {
    event DailyLimitChanged(uint256 newLimit);
    event ExecutionDailyLimitChanged(uint256 newLimit);
    event GasPriceChanged(uint256 gasPrice);
    event OwnershipTransferred(address previousOwner, address newOwner);
    event PaidInterest(address indexed token, address to, uint256 value);
    event RelayedMessage(address recipient, uint256 value, bytes32 transactionHash);
    event RequiredBlockConfirmationChanged(uint256 requiredBlockConfirmations);
    event UserRequestForAffirmation(address recipient, uint256 value);

    function claimTokens(address _token, address _to) external;
    function daiToken() external pure returns (address);
    function dailyLimit() external view returns (uint256);
    function decimalShift() external view returns (int256);
    function deployedAtBlock() external view returns (uint256);
    function disableInterest(address _token) external;
    function erc20token() external view returns (address);
    function executeSignatures(bytes memory message, bytes memory signatures) external;
    function executeSignaturesUSDS(bytes memory message, bytes memory signatures) external;
    function executeSignaturesGSN(bytes memory message, bytes memory signatures, uint256 maxTokensFee) external;
    function executionDailyLimit() external view returns (uint256);
    function executionMaxPerTx() external view returns (uint256);
    function gasPrice() external view returns (uint256);
    function getBridgeInterfacesVersion() external pure returns (uint64 major, uint64 minor, uint64 patch);
    function getBridgeMode() external pure returns (bytes4 _data);
    function getCurrentDay() external view returns (uint256);
    function getTrustedForwarder() external view returns (address);
    function initialize(
        address _validatorContract,
        address _erc20token,
        uint256 _requiredBlockConfirmations,
        uint256 _gasPrice,
        uint256[3] memory _dailyLimitMaxPerTxMinPerTxArray,
        uint256[2] memory _homeDailyLimitHomeMaxPerTxArray,
        address _owner,
        int256 _decimalShift,
        address _bridgeOnOtherSide
    ) external returns (bool);
    function initializeInterest(
        address _token,
        uint256 _minCashThreshold,
        uint256 _minInterestPaid,
        address _interestReceiver
    ) external;
    function swapSDAIToUSDS() external;
    function interestAmount(address _token) external view returns (uint256);
    function interestReceiver(address _token) external view returns (address);
    function invest(address _token) external;
    function investDai() external;
    function investedAmount(address _token) external view returns (uint256);
    function isInitialized() external view returns (bool);
    function isInterestEnabled(address _token) external view returns (bool);
    function isTrustedForwarder(address forwarder) external view returns (bool);
    function maxAvailablePerTx() external view returns (uint256);
    function maxPerTx() external view returns (uint256);
    function minCashThreshold(address _token) external view returns (uint256);
    function minInterestPaid(address _token) external view returns (uint256);
    function minPerTx() external view returns (uint256);
    function owner() external view returns (address);
    function payInterest(address _token, uint256 _amount) external;
    function previewWithdraw(address _token, uint256 _amount) external view returns (uint256);
    function refillBridge() external;
    function relayTokens(address _receiver, uint256 _amount) external;
    function relayedMessages(bytes32 _nonce) external view returns (bool);
    function requiredBlockConfirmations() external view returns (uint256);
    function requiredSignatures() external view returns (uint256);
    function sDaiToken() external pure returns (address);
    function setDailyLimit(uint256 _dailyLimit) external;
    function setExecutionDailyLimit(uint256 _dailyLimit) external;
    function setExecutionMaxPerTx(uint256 _maxPerTx) external;
    function setGasPrice(uint256 _gasPrice) external;
    function setInterestReceiver(address _token, address _receiver) external;
    function setMaxPerTx(uint256 _maxPerTx) external;
    function setMinCashThreshold(address _token, uint256 _minCashThreshold) external;
    function setMinInterestPaid(address _token, uint256 _minInterestPaid) external;
    function setMinPerTx(uint256 _minPerTx) external;
    function setPayMaster(address _paymaster) external;
    function setRequiredBlockConfirmations(uint256 _blockConfirmations) external;
    function setTrustedForwarder(address _trustedForwarder) external;
    function totalExecutedPerDay(uint256 _day) external view returns (uint256);
    function totalSpentPerDay(uint256 _day) external view returns (uint256);
    function transferOwnership(address newOwner) external;
    function validatorContract() external view returns (address);
    function versionRecipient() external view returns (string memory);
    function withinExecutionLimit(uint256 _amount) external view returns (bool);
    function withinLimit(uint256 _amount) external view returns (bool);
    function setNewErc20Token(address newDAI) external;
}

pragma solidity ^0.8.0;

interface IERC20 {
    function approve(address usr, uint256 wad) external;
    function allowance(address owner, address spender, uint256 amount) external returns (uint256);
    function permit(address owner, address spender, uint256 amount, uint256 deadline, bytes memory signatures) external;
    function transferFrom(address owner, address spender, uint256 amount) external;
    function transfer(address usr, uint256 wad) external;
    function balanceOf(address usr) external returns (uint256);
}

{
  "remappings": [
    "@openzeppelin/contracts/=lib/openzeppelin-contracts/contracts/",
    "@openzeppelin/contracts-upgradeable/=lib/openzeppelin-contracts-upgradeable/contracts/",
    "openzeppelin-solidity/=node_modules/openzeppelin-solidity/",
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "erc4626-tests/=lib/openzeppelin-contracts-upgradeable/lib/erc4626-tests/",
    "forge-std/=lib/forge-std/src/",
    "halmos-cheatcodes/=lib/openzeppelin-contracts-upgradeable/lib/halmos-cheatcodes/src/",
    "openzeppelin-contracts-upgradeable/=lib/openzeppelin-contracts-upgradeable/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 10
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "cancun",
  "viaIR": false,
  "libraries": {}
}

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[{"inputs":[{"internalType":"address","name":"_router","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"DAI","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"DAIUSDS","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"FOREIGN_XDAIBRIDGE","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"USDS","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"receiver","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"relayTokens","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"router","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"}]

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00000000000000000000000074b987a253864278ea4ae0cf0850e73c3a5bc4f8

-----Decoded View---------------
Arg [0] : _router (address): 0x74b987A253864278eA4Ae0cF0850E73C3A5bc4F8

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 00000000000000000000000074b987a253864278ea4ae0cf0850e73c3a5bc4f8