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// SPDX-License-Identifier: MIT

pragma solidity 0.8.4;
pragma abicoder v2;

import "@openzeppelin-8/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin-8/contracts/token/ERC20/utils/SafeERC20.sol";
import "./interfaces/IStargateRouter.sol";
import "./interfaces/IStargateRouterETH.sol";
import "./interfaces/IStargateFactory.sol";
import "./interfaces/IStargateWidget.sol";

contract WidgetSwap is ReentrancyGuard, IStargateWidget {
    using SafeERC20 for IERC20;

    IStargateRouter public immutable stargateRouter;
    IStargateRouterETH public immutable stargateRouterETH;
    IStargateFactory public immutable stargateFactory;
    uint256 public constant TENTH_BPS_DENOMINATOR = 100000;
    uint256 public constant MAX_UINT = 2**256 - 1;
    mapping(address => bool) public tokenApproved;

    constructor(address _stargateRouter, address _stargateRouterETH, address _stargateFactory) {
        stargateRouter = IStargateRouter(_stargateRouter);
        stargateRouterETH = IStargateRouterETH(_stargateRouterETH);
        stargateFactory = IStargateFactory(_stargateFactory);
    }

    // allow anyone to emit this msg alongside their stargate tx so they can get credited for their referral
    // to get credit this event must be emitted in the same tx as a stargate swap event
    function partnerSwap(bytes2 _partnerId) external override {
        emit PartnerSwap(_partnerId);
    }

    function swapTokens(
        uint16 _dstChainId,
        uint16 _srcPoolId,
        uint16 _dstPoolId,
        uint256 _amountLD,
        uint256 _minAmountLD,
        IStargateRouter.lzTxObj calldata _lzTxParams,
        bytes calldata _to,
        bytes2 _partnerId,
        FeeObj calldata _feeObj
    ) external override nonReentrant payable {
        uint256 widgetFee = _getAndPayWidgetFee(_srcPoolId, _amountLD, _feeObj);

        stargateRouter.swap{value:msg.value}(
            _dstChainId,
            _srcPoolId,
            _dstPoolId,
            payable(msg.sender),
            _amountLD - widgetFee,
            _minAmountLD,
            _lzTxParams,
            _to,
            ""
        );

        emit WidgetSwapped(_partnerId, _feeObj.tenthBps, widgetFee);
    }

    function swapETH(
        uint16 _dstChainId,
        uint256 _amountLD,
        uint256 _minAmountLD,
        bytes calldata _to,
        bytes2 _partnerId,
        FeeObj calldata _feeObj
    ) external override nonReentrant payable {
        // allows us to deploy same contract on non eth chains
        require(address(stargateRouterETH) != address(0x0), "WidgetSwap: func not available");

        uint256 widgetFee = _getAndPayWidgetFeeETH(_amountLD, _feeObj);

        // "value:" contains the amount of eth to swap and the stargate/layerZero fees, minus the widget fee
        stargateRouterETH.swapETH{value:msg.value - widgetFee}(
            _dstChainId,
            payable(msg.sender),
            _to,
            _amountLD - widgetFee,
            _minAmountLD
        );

        emit WidgetSwapped(_partnerId, _feeObj.tenthBps, widgetFee);
    }


    function _getAndPayWidgetFee(
        uint16 _srcPoolId,
        uint256 _amountLD,
        FeeObj calldata _feeObj
    ) internal returns (uint256 widgetFee) {
        // corresponding token to the poolId
        address token = stargateFactory.getPool(_srcPoolId).token();

        // move all the tokens to this contract
        IERC20(token).safeTransferFrom(msg.sender, address(this), _amountLD);

        // calculate the widgetFee
        widgetFee = _amountLD * _feeObj.tenthBps / TENTH_BPS_DENOMINATOR;

        // pay the widget fee
        IERC20(token).safeTransfer(_feeObj.feeCollector, widgetFee);

        // only call max approval once
        if (!tokenApproved[token]) {
            tokenApproved[token] = true;
            // allow stargateRouter to spend the tokens to be transferred
            IERC20(token).safeApprove(address(stargateRouter), MAX_UINT);
        }

        return widgetFee;
    }

    function _getAndPayWidgetFeeETH(
        uint256 _amountLD,
        FeeObj calldata _feeObj
    ) internal returns (uint256 widgetFee) {
        // calculate the widgetFee
        widgetFee = _amountLD * _feeObj.tenthBps / TENTH_BPS_DENOMINATOR;
        require(msg.value > widgetFee, "WidgetSwap: not enough eth for widgetFee");

        // verify theres enough eth to cover the amount to swap
        require(msg.value - widgetFee > _amountLD, "WidgetSwap: not enough eth for swap");

        // pay the widget fee
        (bool success, ) = _feeObj.feeCollector.call{value: widgetFee}("");
        require(success, "WidgetSwap: failed to transfer widgetFee");

        return widgetFee;
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.4;

interface IStargatePool {
    function token() external returns (address);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be _NOT_ENTERED
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == _ENTERED;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.3) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/IERC20Permit.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
     * Revert on invalid signature.
     */
    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return
            success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token));
    }
}

// SPDX-License-Identifier: BUSL-1.1

pragma solidity >=0.7.6 <=0.8.4;
pragma abicoder v2;

interface IStargateRouter {
    struct lzTxObj {
        uint256 dstGasForCall;
        uint256 dstNativeAmount;
        bytes dstNativeAddr;
    }

    function addLiquidity(
        uint256 _poolId,
        uint256 _amountLD,
        address _to
    ) external;

    function swap(
        uint16 _dstChainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress,
        uint256 _amountLD,
        uint256 _minAmountLD,
        lzTxObj memory _lzTxParams,
        bytes calldata _to,
        bytes calldata _payload
    ) external payable;

    function redeemRemote(
        uint16 _dstChainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress,
        uint256 _amountLP,
        uint256 _minAmountLD,
        bytes calldata _to,
        lzTxObj memory _lzTxParams
    ) external payable;

    function instantRedeemLocal(
        uint16 _srcPoolId,
        uint256 _amountLP,
        address _to
    ) external returns (uint256);

    function redeemLocal(
        uint16 _dstChainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress,
        uint256 _amountLP,
        bytes calldata _to,
        lzTxObj memory _lzTxParams
    ) external payable;

    function sendCredits(
        uint16 _dstChainId,
        uint256 _srcPoolId,
        uint256 _dstPoolId,
        address payable _refundAddress
    ) external payable;

    function quoteLayerZeroFee(
        uint16 _dstChainId,
        uint8 _functionType,
        bytes calldata _toAddress,
        bytes calldata _transferAndCallPayload,
        lzTxObj memory _lzTxParams
    ) external view returns (uint256, uint256);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.4;
pragma abicoder v2;

interface IStargateRouterETH {
    function addLiquidityETH() external payable;

    function swapETH(
        uint16 dstChainId,
        address payable refundAddress,
        bytes calldata to,
        uint256 amountLD,
        uint256 minAmountLD
    ) external payable;
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.4;

import "./IStargatePool.sol";

interface IStargateFactory {
    function getPool(uint256 _srcPoolId) external returns (IStargatePool);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.4;
pragma abicoder v2;

import "../interfaces/IStargateRouter.sol";

interface IStargateWidget {
    struct FeeObj {
        uint256 tenthBps; // bps is to an extra decimal place
        address feeCollector;
    }

    event WidgetSwapped(bytes2 indexed partnerId, uint256 tenthBps, uint256 widgetFee);
    event PartnerSwap(bytes2 indexed partnerId);

    function partnerSwap(bytes2 _partnerId) external;

    function swapTokens(
        uint16 _dstChainId,
        uint16 _srcPoolId,
        uint16 _dstPoolId,
        uint256 _amountLD,
        uint256 _minAmountLD,
        IStargateRouter.lzTxObj calldata _lzTxParams,
        bytes calldata _to,
        bytes2 _partnerId,
        FeeObj calldata _feeObj
    ) external payable;


    function swapETH(
        uint16 _dstChainId,
        uint256 _amountLD,
        uint256 _minAmountLD,
        bytes calldata _to,
        bytes2 _partnerId,
        FeeObj calldata _feeObj
    ) external payable;
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"_stargateRouter","type":"address"},{"internalType":"address","name":"_stargateRouterETH","type":"address"},{"internalType":"address","name":"_stargateFactory","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes2","name":"partnerId","type":"bytes2"}],"name":"PartnerSwap","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes2","name":"partnerId","type":"bytes2"},{"indexed":false,"internalType":"uint256","name":"tenthBps","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"widgetFee","type":"uint256"}],"name":"WidgetSwapped","type":"event"},{"inputs":[],"name":"MAX_UINT","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"TENTH_BPS_DENOMINATOR","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes2","name":"_partnerId","type":"bytes2"}],"name":"partnerSwap","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"stargateFactory","outputs":[{"internalType":"contract IStargateFactory","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"stargateRouter","outputs":[{"internalType":"contract IStargateRouter","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"stargateRouterETH","outputs":[{"internalType":"contract IStargateRouterETH","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint16","name":"_dstChainId","type":"uint16"},{"internalType":"uint256","name":"_amountLD","type":"uint256"},{"internalType":"uint256","name":"_minAmountLD","type":"uint256"},{"internalType":"bytes","name":"_to","type":"bytes"},{"internalType":"bytes2","name":"_partnerId","type":"bytes2"},{"components":[{"internalType":"uint256","name":"tenthBps","type":"uint256"},{"internalType":"address","name":"feeCollector","type":"address"}],"internalType":"struct IStargateWidget.FeeObj","name":"_feeObj","type":"tuple"}],"name":"swapETH","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint16","name":"_dstChainId","type":"uint16"},{"internalType":"uint16","name":"_srcPoolId","type":"uint16"},{"internalType":"uint16","name":"_dstPoolId","type":"uint16"},{"internalType":"uint256","name":"_amountLD","type":"uint256"},{"internalType":"uint256","name":"_minAmountLD","type":"uint256"},{"components":[{"internalType":"uint256","name":"dstGasForCall","type":"uint256"},{"internalType":"uint256","name":"dstNativeAmount","type":"uint256"},{"internalType":"bytes","name":"dstNativeAddr","type":"bytes"}],"internalType":"struct IStargateRouter.lzTxObj","name":"_lzTxParams","type":"tuple"},{"internalType":"bytes","name":"_to","type":"bytes"},{"internalType":"bytes2","name":"_partnerId","type":"bytes2"},{"components":[{"internalType":"uint256","name":"tenthBps","type":"uint256"},{"internalType":"address","name":"feeCollector","type":"address"}],"internalType":"struct IStargateWidget.FeeObj","name":"_feeObj","type":"tuple"}],"name":"swapTokens","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"tokenApproved","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"}]

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0000000000000000000000008731d54e9d02c286767d56ac03e8037c07e01e98000000000000000000000000150f94b44927f078737562f0fcf3c95c01cc237600000000000000000000000006d538690af257da524f25d0cd52fd85b1c2173e

-----Decoded View---------------
Arg [0] : _stargateRouter (address): 0x8731d54E9D02c286767d56ac03e8037C07e01e98
Arg [1] : _stargateRouterETH (address): 0x150f94B44927F078737562f0fcF3C95c01Cc2376
Arg [2] : _stargateFactory (address): 0x06D538690AF257Da524f25D0CD52fD85b1c2173E

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 0000000000000000000000008731d54e9d02c286767d56ac03e8037c07e01e98
Arg [1] : 000000000000000000000000150f94b44927f078737562f0fcf3c95c01cc2376
Arg [2] : 00000000000000000000000006d538690af257da524f25d0cd52fd85b1c2173e

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