creation_sourcecode: {{
    "language": "Solidity",
    "sources": {
      "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)\n\npragma solidity ^0.8.0;\n\nimport \"../utils/ContextUpgradeable.sol\";\nimport \"../proxy/utils/Initializable.sol\";\n\n/**\n * @dev Contract module which provides a basic access control mechanism, where\n * there is an account (an owner) that can be granted exclusive access to\n * specific functions.\n *\n * By default, the owner account will be the one that deploys the contract. This\n * can later be changed with {transferOwnership}.\n *\n * This module is used through inheritance. It will make available the modifier\n * `onlyOwner`, which can be applied to your functions to restrict their use to\n * the owner.\n */\nabstract contract OwnableUpgradeable is Initializable, ContextUpgradeable {\n    address private _owner;\n\n    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);\n\n    /**\n     * @dev Initializes the contract setting the deployer as the initial owner.\n     */\n    function __Ownable_init() internal onlyInitializing {\n        __Ownable_init_unchained();\n    }\n\n    function __Ownable_init_unchained() internal onlyInitializing {\n        _transferOwnership(_msgSender());\n    }\n\n    /**\n     * @dev Throws if called by any account other than the owner.\n     */\n    modifier onlyOwner() {\n        _checkOwner();\n        _;\n    }\n\n    /**\n     * @dev Returns the address of the current owner.\n     */\n    function owner() public view virtual returns (address) {\n        return _owner;\n    }\n\n    /**\n     * @dev Throws if the sender is not the owner.\n     */\n    function _checkOwner() internal view virtual {\n        require(owner() == _msgSender(), \"Ownable: caller is not the owner\");\n    }\n\n    /**\n     * @dev Leaves the contract without owner. It will not be possible to call\n     * `onlyOwner` functions. Can only be called by the current owner.\n     *\n     * NOTE: Renouncing ownership will leave the contract without an owner,\n     * thereby disabling any functionality that is only available to the owner.\n     */\n    function renounceOwnership() public virtual onlyOwner {\n        _transferOwnership(address(0));\n    }\n\n    /**\n     * @dev Transfers ownership of the contract to a new account (`newOwner`).\n     * Can only be called by the current owner.\n     */\n    function transferOwnership(address newOwner) public virtual onlyOwner {\n        require(newOwner != address(0), \"Ownable: new owner is the zero address\");\n        _transferOwnership(newOwner);\n    }\n\n    /**\n     * @dev Transfers ownership of the contract to a new account (`newOwner`).\n     * Internal function without access restriction.\n     */\n    function _transferOwnership(address newOwner) internal virtual {\n        address oldOwner = _owner;\n        _owner = newOwner;\n        emit OwnershipTransferred(oldOwner, newOwner);\n    }\n\n    /**\n     * @dev This empty reserved space is put in place to allow future versions to add new\n     * variables without shifting down storage in the inheritance chain.\n     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps\n     */\n    uint256[49] private __gap;\n}\n"
      },
      "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.9.0) (proxy/utils/Initializable.sol)\n\npragma solidity ^0.8.2;\n\nimport \"../../utils/AddressUpgradeable.sol\";\n\n/**\n * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed\n * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an\n * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer\n * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.\n *\n * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be\n * reused. This mechanism prevents re-execution of each \"step\" but allows the creation of new initialization steps in\n * case an upgrade adds a module that needs to be initialized.\n *\n * For example:\n *\n * [.hljs-theme-light.nopadding]\n * ```solidity\n * contract MyToken is ERC20Upgradeable {\n *     function initialize() initializer public {\n *         __ERC20_init(\"MyToken\", \"MTK\");\n *     }\n * }\n *\n * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {\n *     function initializeV2() reinitializer(2) public {\n *         __ERC20Permit_init(\"MyToken\");\n *     }\n * }\n * ```\n *\n * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as\n * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.\n *\n * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure\n * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.\n *\n * [CAUTION]\n * ====\n * Avoid leaving a contract uninitialized.\n *\n * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation\n * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke\n * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:\n *\n * [.hljs-theme-light.nopadding]\n * ```\n * /// @custom:oz-upgrades-unsafe-allow constructor\n * constructor() {\n *     _disableInitializers();\n * }\n * ```\n * ====\n */\nabstract contract Initializable {\n    /**\n     * @dev Indicates that the contract has been initialized.\n     * @custom:oz-retyped-from bool\n     */\n    uint8 private _initialized;\n\n    /**\n     * @dev Indicates that the contract is in the process of being initialized.\n     */\n    bool private _initializing;\n\n    /**\n     * @dev Triggered when the contract has been initialized or reinitialized.\n     */\n    event Initialized(uint8 version);\n\n    /**\n     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,\n     * `onlyInitializing` functions can be used to initialize parent contracts.\n     *\n     * Similar to `reinitializer(1)`, except that functions marked with `initializer` can be nested in the context of a\n     * constructor.\n     *\n     * Emits an {Initialized} event.\n     */\n    modifier initializer() {\n        bool isTopLevelCall = !_initializing;\n        require(\n            (isTopLevelCall && _initialized < 1) || (!AddressUpgradeable.isContract(address(this)) && _initialized == 1),\n            \"Initializable: contract is already initialized\"\n        );\n        _initialized = 1;\n        if (isTopLevelCall) {\n            _initializing = true;\n        }\n        _;\n        if (isTopLevelCall) {\n            _initializing = false;\n            emit Initialized(1);\n        }\n    }\n\n    /**\n     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the\n     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be\n     * used to initialize parent contracts.\n     *\n     * A reinitializer may be used after the original initialization step. This is essential to configure modules that\n     * are added through upgrades and that require initialization.\n     *\n     * When `version` is 1, this modifier is similar to `initializer`, except that functions marked with `reinitializer`\n     * cannot be nested. If one is invoked in the context of another, execution will revert.\n     *\n     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in\n     * a contract, executing them in the right order is up to the developer or operator.\n     *\n     * WARNING: setting the version to 255 will prevent any future reinitialization.\n     *\n     * Emits an {Initialized} event.\n     */\n    modifier reinitializer(uint8 version) {\n        require(!_initializing && _initialized < version, \"Initializable: contract is already initialized\");\n        _initialized = version;\n        _initializing = true;\n        _;\n        _initializing = false;\n        emit Initialized(version);\n    }\n\n    /**\n     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the\n     * {initializer} and {reinitializer} modifiers, directly or indirectly.\n     */\n    modifier onlyInitializing() {\n        require(_initializing, \"Initializable: contract is not initializing\");\n        _;\n    }\n\n    /**\n     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.\n     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized\n     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called\n     * through proxies.\n     *\n     * Emits an {Initialized} event the first time it is successfully executed.\n     */\n    function _disableInitializers() internal virtual {\n        require(!_initializing, \"Initializable: contract is initializing\");\n        if (_initialized != type(uint8).max) {\n            _initialized = type(uint8).max;\n            emit Initialized(type(uint8).max);\n        }\n    }\n\n    /**\n     * @dev Returns the highest version that has been initialized. See {reinitializer}.\n     */\n    function _getInitializedVersion() internal view returns (uint8) {\n        return _initialized;\n    }\n\n    /**\n     * @dev Returns `true` if the contract is currently initializing. See {onlyInitializing}.\n     */\n    function _isInitializing() internal view returns (bool) {\n        return _initializing;\n    }\n}\n"
      },
      "@openzeppelin/contracts-upgradeable/security/ReentrancyGuardUpgradeable.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.9.0) (security/ReentrancyGuard.sol)\n\npragma solidity ^0.8.0;\nimport \"../proxy/utils/Initializable.sol\";\n\n/**\n * @dev Contract module that helps prevent reentrant calls to a function.\n *\n * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier\n * available, which can be applied to functions to make sure there are no nested\n * (reentrant) calls to them.\n *\n * Note that because there is a single `nonReentrant` guard, functions marked as\n * `nonReentrant` may not call one another. This can be worked around by making\n * those functions `private`, and then adding `external` `nonReentrant` entry\n * points to them.\n *\n * TIP: If you would like to learn more about reentrancy and alternative ways\n * to protect against it, check out our blog post\n * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].\n */\nabstract contract ReentrancyGuardUpgradeable is Initializable {\n    // Booleans are more expensive than uint256 or any type that takes up a full\n    // word because each write operation emits an extra SLOAD to first read the\n    // slot's contents, replace the bits taken up by the boolean, and then write\n    // back. This is the compiler's defense against contract upgrades and\n    // pointer aliasing, and it cannot be disabled.\n\n    // The values being non-zero value makes deployment a bit more expensive,\n    // but in exchange the refund on every call to nonReentrant will be lower in\n    // amount. Since refunds are capped to a percentage of the total\n    // transaction's gas, it is best to keep them low in cases like this one, to\n    // increase the likelihood of the full refund coming into effect.\n    uint256 private constant _NOT_ENTERED = 1;\n    uint256 private constant _ENTERED = 2;\n\n    uint256 private _status;\n\n    function __ReentrancyGuard_init() internal onlyInitializing {\n        __ReentrancyGuard_init_unchained();\n    }\n\n    function __ReentrancyGuard_init_unchained() internal onlyInitializing {\n        _status = _NOT_ENTERED;\n    }\n\n    /**\n     * @dev Prevents a contract from calling itself, directly or indirectly.\n     * Calling a `nonReentrant` function from another `nonReentrant`\n     * function is not supported. It is possible to prevent this from happening\n     * by making the `nonReentrant` function external, and making it call a\n     * `private` function that does the actual work.\n     */\n    modifier nonReentrant() {\n        _nonReentrantBefore();\n        _;\n        _nonReentrantAfter();\n    }\n\n    function _nonReentrantBefore() private {\n        // On the first call to nonReentrant, _status will be _NOT_ENTERED\n        require(_status != _ENTERED, \"ReentrancyGuard: reentrant call\");\n\n        // Any calls to nonReentrant after this point will fail\n        _status = _ENTERED;\n    }\n\n    function _nonReentrantAfter() private {\n        // By storing the original value once again, a refund is triggered (see\n        // https://eips.ethereum.org/EIPS/eip-2200)\n        _status = _NOT_ENTERED;\n    }\n\n    /**\n     * @dev Returns true if the reentrancy guard is currently set to \"entered\", which indicates there is a\n     * `nonReentrant` function in the call stack.\n     */\n    function _reentrancyGuardEntered() internal view returns (bool) {\n        return _status == _ENTERED;\n    }\n\n    /**\n     * @dev This empty reserved space is put in place to allow future versions to add new\n     * variables without shifting down storage in the inheritance chain.\n     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps\n     */\n    uint256[49] private __gap;\n}\n"
      },
      "@openzeppelin/contracts-upgradeable/utils/AddressUpgradeable.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)\n\npragma solidity ^0.8.2;\n\n/**\n * @dev Collection of functions related to the address type\n */\nlibrary AddressUpgradeable {\n    /**\n     * @dev Returns true if `account` is a contract.\n     *\n     * [IMPORTANT]\n     * ====\n     * It is unsafe to assume that an address for which this function returns\n     * false is an externally-owned account (EOA) and not a contract.\n     *\n     * Among others, `isContract` will return false for the following\n     * types of addresses:\n     *\n     *  - an externally-owned account\n     *  - a contract in construction\n     *  - an address where a contract will be created\n     *  - an address where a contract lived, but was destroyed\n     *\n     * Furthermore, `isContract` will also return true if the target contract within\n     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,\n     * which only has an effect at the end of a transaction.\n     * ====\n     *\n     * [IMPORTANT]\n     * ====\n     * You shouldn't rely on `isContract` to protect against flash loan attacks!\n     *\n     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets\n     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract\n     * constructor.\n     * ====\n     */\n    function isContract(address account) internal view returns (bool) {\n        // This method relies on extcodesize/address.code.length, which returns 0\n        // for contracts in construction, since the code is only stored at the end\n        // of the constructor execution.\n\n        return account.code.length > 0;\n    }\n\n    /**\n     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to\n     * `recipient`, forwarding all available gas and reverting on errors.\n     *\n     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\n     * of certain opcodes, possibly making contracts go over the 2300 gas limit\n     * imposed by `transfer`, making them unable to receive funds via\n     * `transfer`. {sendValue} removes this limitation.\n     *\n     * https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more].\n     *\n     * IMPORTANT: because control is transferred to `recipient`, care must be\n     * taken to not create reentrancy vulnerabilities. Consider using\n     * {ReentrancyGuard} or the\n     * https://solidity.readthedocs.io/en/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].\n     */\n    function sendValue(address payable recipient, uint256 amount) internal {\n        require(address(this).balance >= amount, \"Address: insufficient balance\");\n\n        (bool success, ) = recipient.call{value: amount}(\"\");\n        require(success, \"Address: unable to send value, recipient may have reverted\");\n    }\n\n    /**\n     * @dev Performs a Solidity function call using a low level `call`. A\n     * plain `call` is an unsafe replacement for a function call: use this\n     * function instead.\n     *\n     * If `target` reverts with a revert reason, it is bubbled up by this\n     * function (like regular Solidity function calls).\n     *\n     * Returns the raw returned data. To convert to the expected return value,\n     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].\n     *\n     * Requirements:\n     *\n     * - `target` must be a contract.\n     * - calling `target` with `data` must not revert.\n     *\n     * _Available since v3.1._\n     */\n    function functionCall(address target, bytes memory data) internal returns (bytes memory) {\n        return functionCallWithValue(target, data, 0, \"Address: low-level call failed\");\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with\n     * `errorMessage` as a fallback revert reason when `target` reverts.\n     *\n     * _Available since v3.1._\n     */\n    function functionCall(\n        address target,\n        bytes memory data,\n        string memory errorMessage\n    ) internal returns (bytes memory) {\n        return functionCallWithValue(target, data, 0, errorMessage);\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\n     * but also transferring `value` wei to `target`.\n     *\n     * Requirements:\n     *\n     * - the calling contract must have an ETH balance of at least `value`.\n     * - the called Solidity function must be `payable`.\n     *\n     * _Available since v3.1._\n     */\n    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {\n        return functionCallWithValue(target, data, value, \"Address: low-level call with value failed\");\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but\n     * with `errorMessage` as a fallback revert reason when `target` reverts.\n     *\n     * _Available since v3.1._\n     */\n    function functionCallWithValue(\n        address target,\n        bytes memory data,\n        uint256 value,\n        string memory errorMessage\n    ) internal returns (bytes memory) {\n        require(address(this).balance >= value, \"Address: insufficient balance for call\");\n        (bool success, bytes memory returndata) = target.call{value: value}(data);\n        return verifyCallResultFromTarget(target, success, returndata, errorMessage);\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\n     * but performing a static call.\n     *\n     * _Available since v3.3._\n     */\n    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {\n        return functionStaticCall(target, data, \"Address: low-level static call failed\");\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],\n     * but performing a static call.\n     *\n     * _Available since v3.3._\n     */\n    function functionStaticCall(\n        address target,\n        bytes memory data,\n        string memory errorMessage\n    ) internal view returns (bytes memory) {\n        (bool success, bytes memory returndata) = target.staticcall(data);\n        return verifyCallResultFromTarget(target, success, returndata, errorMessage);\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\n     * but performing a delegate call.\n     *\n     * _Available since v3.4._\n     */\n    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {\n        return functionDelegateCall(target, data, \"Address: low-level delegate call failed\");\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],\n     * but performing a delegate call.\n     *\n     * _Available since v3.4._\n     */\n    function functionDelegateCall(\n        address target,\n        bytes memory data,\n        string memory errorMessage\n    ) internal returns (bytes memory) {\n        (bool success, bytes memory returndata) = target.delegatecall(data);\n        return verifyCallResultFromTarget(target, success, returndata, errorMessage);\n    }\n\n    /**\n     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling\n     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.\n     *\n     * _Available since v4.8._\n     */\n    function verifyCallResultFromTarget(\n        address target,\n        bool success,\n        bytes memory returndata,\n        string memory errorMessage\n    ) internal view returns (bytes memory) {\n        if (success) {\n            if (returndata.length == 0) {\n                // only check isContract if the call was successful and the return data is empty\n                // otherwise we already know that it was a contract\n                require(isContract(target), \"Address: call to non-contract\");\n            }\n            return returndata;\n        } else {\n            _revert(returndata, errorMessage);\n        }\n    }\n\n    /**\n     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the\n     * revert reason or using the provided one.\n     *\n     * _Available since v4.3._\n     */\n    function verifyCallResult(\n        bool success,\n        bytes memory returndata,\n        string memory errorMessage\n    ) internal pure returns (bytes memory) {\n        if (success) {\n            return returndata;\n        } else {\n            _revert(returndata, errorMessage);\n        }\n    }\n\n    function _revert(bytes memory returndata, string memory errorMessage) private pure {\n        // Look for revert reason and bubble it up if present\n        if (returndata.length > 0) {\n            // The easiest way to bubble the revert reason is using memory via assembly\n            /// @solidity memory-safe-assembly\n            assembly {\n                let returndata_size := mload(returndata)\n                revert(add(32, returndata), returndata_size)\n            }\n        } else {\n            revert(errorMessage);\n        }\n    }\n}\n"
      },
      "@openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)\n\npragma solidity ^0.8.0;\nimport \"../proxy/utils/Initializable.sol\";\n\n/**\n * @dev Provides information about the current execution context, including the\n * sender of the transaction and its data. While these are generally available\n * via msg.sender and msg.data, they should not be accessed in such a direct\n * manner, since when dealing with meta-transactions the account sending and\n * paying for execution may not be the actual sender (as far as an application\n * is concerned).\n *\n * This contract is only required for intermediate, library-like contracts.\n */\nabstract contract ContextUpgradeable is Initializable {\n    function __Context_init() internal onlyInitializing {\n    }\n\n    function __Context_init_unchained() internal onlyInitializing {\n    }\n    function _msgSender() internal view virtual returns (address) {\n        return msg.sender;\n    }\n\n    function _msgData() internal view virtual returns (bytes calldata) {\n        return msg.data;\n    }\n\n    /**\n     * @dev This empty reserved space is put in place to allow future versions to add new\n     * variables without shifting down storage in the inheritance chain.\n     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps\n     */\n    uint256[50] private __gap;\n}\n"
      },
      "contracts/interfaces/IERC20.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)\n\npragma solidity ^0.8.0;\n\n/**\n * @dev Interface of the ERC20 standard as defined in the EIP.\n */\ninterface IERC20 {\n    /**\n     * @dev Emitted when `value` tokens are moved from one account (`from`) to\n     * another (`to`).\n     *\n     * Note that `value` may be zero.\n     */\n    event Transfer(address indexed from, address indexed to, uint256 value);\n\n    /**\n     * @dev Emitted when the allowance of a `spender` for an `owner` is set by\n     * a call to {approve}. `value` is the new allowance.\n     */\n    event Approval(address indexed owner, address indexed spender, uint256 value);\n\n    /**\n     * @dev Returns the amount of tokens in existence.\n     */\n    function totalSupply() external view returns (uint256);\n\n    /**\n     * @dev Returns the amount of tokens owned by `account`.\n     */\n    function balanceOf(address account) external view returns (uint256);\n\n    /**\n     * @dev Moves `amount` tokens from the caller's account to `to`.\n     *\n     * Returns a boolean value indicating whether the operation succeeded.\n     *\n     * Emits a {Transfer} event.\n     */\n    function transfer(address to, uint256 amount) external returns (bool);\n\n    /**\n     * @dev Returns the remaining number of tokens that `spender` will be\n     * allowed to spend on behalf of `owner` through {transferFrom}. This is\n     * zero by default.\n     *\n     * This value changes when {approve} or {transferFrom} are called.\n     */\n    function allowance(address owner, address spender) external view returns (uint256);\n\n    /**\n     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.\n     *\n     * Returns a boolean value indicating whether the operation succeeded.\n     *\n     * IMPORTANT: Beware that changing an allowance with this method brings the risk\n     * that someone may use both the old and the new allowance by unfortunate\n     * transaction ordering. One possible solution to mitigate this race\n     * condition is to first reduce the spender's allowance to 0 and set the\n     * desired value afterwards:\n     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\n     *\n     * Emits an {Approval} event.\n     */\n    function approve(address spender, uint256 amount) external returns (bool);\n\n    /**\n     * @dev Moves `amount` tokens from `from` to `to` using the\n     * allowance mechanism. `amount` is then deducted from the caller's\n     * allowance.\n     *\n     * Returns a boolean value indicating whether the operation succeeded.\n     *\n     * Emits a {Transfer} event.\n     */\n    function transferFrom(\n        address from,\n        address to,\n        uint256 amount\n    ) external returns (bool);\n\n    function mint(address to, uint256 amount) external returns (bool);\n    function burn(uint256 amount) external returns (bool);\n    function transferOwnership(address newOwner) external;\n}\n"
      },
      "contracts/interfaces/IUniswapV2Factory.sol": {
        "content": "// SPDX-License-Identifier: Unlicense\n\npragma solidity ^0.8.0;\n\ninterface IUniswapV2Factory {\n    \n    function getPair(address tokenA, address tokenB) external view returns (address pair);\n    \n}"
      },
      "contracts/interfaces/IUniswapV2Router01.sol": {
        "content": "// SPDX-License-Identifier: Unlicense\n\npragma solidity ^0.8.0;\n\ninterface IUniswapV2Router01 {\n    function factory() external pure returns (address);\n    function WETH() external pure returns (address);\n\n    function addLiquidity(\n        address tokenA,\n        address tokenB,\n        uint amountADesired,\n        uint amountBDesired,\n        uint amountAMin,\n        uint amountBMin,\n        address to,\n        uint deadline\n    ) external returns (uint amountA, uint amountB, uint liquidity);\n    function addLiquidityETH(\n        address token,\n        uint amountTokenDesired,\n        uint amountTokenMin,\n        uint amountETHMin,\n        address to,\n        uint deadline\n    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);\n    function removeLiquidity(\n        address tokenA,\n        address tokenB,\n        uint liquidity,\n        uint amountAMin,\n        uint amountBMin,\n        address to,\n        uint deadline\n    ) external returns (uint amountA, uint amountB);\n    function removeLiquidityETH(\n        address token,\n        uint liquidity,\n        uint amountTokenMin,\n        uint amountETHMin,\n        address to,\n        uint deadline\n    ) external returns (uint amountToken, uint amountETH);\n    function removeLiquidityWithPermit(\n        address tokenA,\n        address tokenB,\n        uint liquidity,\n        uint amountAMin,\n        uint amountBMin,\n        address to,\n        uint deadline,\n        bool approveMax, uint8 v, bytes32 r, bytes32 s\n    ) external returns (uint amountA, uint amountB);\n    function removeLiquidityETHWithPermit(\n        address token,\n        uint liquidity,\n        uint amountTokenMin,\n        uint amountETHMin,\n        address to,\n        uint deadline,\n        bool approveMax, uint8 v, bytes32 r, bytes32 s\n    ) external returns (uint amountToken, uint amountETH);\n    function swapExactTokensForTokens(\n        uint amountIn,\n        uint amountOutMin,\n        address[] calldata path,\n        address to,\n        uint deadline\n    ) external returns (uint[] memory amounts);\n    function swapTokensForExactTokens(\n        uint amountOut,\n        uint amountInMax,\n        address[] calldata path,\n        address to,\n        uint deadline\n    ) external returns (uint[] memory amounts);\n    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)\n        external\n        payable\n        returns (uint[] memory amounts);\n    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)\n        external\n        returns (uint[] memory amounts);\n    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)\n        external\n        returns (uint[] memory amounts);\n    function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)\n        external\n        payable\n        returns (uint[] memory amounts);\n\n    function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);\n    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);\n    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);\n    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);\n    function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);\n}"
      },
      "contracts/interfaces/IUniswapV2Router02.sol": {
        "content": "// SPDX-License-Identifier: Unlicense\n\npragma solidity ^0.8.0;\n\nimport \"./IUniswapV2Router01.sol\";\n\ninterface IUniswapV2Router02 is IUniswapV2Router01 {\n    function removeLiquidityETHSupportingFeeOnTransferTokens(\n        address token,\n        uint liquidity,\n        uint amountTokenMin,\n        uint amountETHMin,\n        address to,\n        uint deadline\n    ) external returns (uint amountETH);\n    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(\n        address token,\n        uint liquidity,\n        uint amountTokenMin,\n        uint amountETHMin,\n        address to,\n        uint deadline,\n        bool approveMax, uint8 v, bytes32 r, bytes32 s\n    ) external returns (uint amountETH);\n\n    function swapExactTokensForTokensSupportingFeeOnTransferTokens(\n        uint amountIn,\n        uint amountOutMin,\n        address[] calldata path,\n        address to,\n        uint deadline\n    ) external;\n    function swapExactETHForTokensSupportingFeeOnTransferTokens(\n        uint amountOutMin,\n        address[] calldata path,\n        address to,\n        uint deadline\n    ) external payable;\n    function swapExactTokensForETHSupportingFeeOnTransferTokens(\n        uint amountIn,\n        uint amountOutMin,\n        address[] calldata path,\n        address to,\n        uint deadline\n    ) external;\n}"
      },
      "contracts/XBridge4.sol": {
        "content": "// SPDX-License-Identifier: UNLICENSED\n\npragma solidity ^0.8.0;\n\nimport \"@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol\";\nimport \"@openzeppelin/contracts-upgradeable/security/ReentrancyGuardUpgradeable.sol\";\nimport \"./interfaces/IERC20.sol\";\nimport \"./interfaces/IUniswapV2Router02.sol\";\nimport \"./interfaces/IUniswapV2Factory.sol\";\n\n\ncontract XBridge is OwnableUpgradeable, ReentrancyGuardUpgradeable {\n\n    uint256 public listingFee;\n    address public factory;\n    address public tokenFeeCollector;\n    address public listingFeeCollector;\n    address[] public admin;\n    address public usdt;\n    IUniswapV2Router02 public router;\n    uint256 public thresholdLimit;\n\n    struct tokenInfo {\n        address token;\n        uint256 chain;\n    }\n\n    mapping(address => bool) public isBase;\n    mapping(address => bool) public isWrapped;\n    mapping(address => uint256) public tokenTax;\n    mapping(uint256 => bool) public chainSupported;\n    mapping(address => uint256) public feesForToken;\n    mapping(address => uint256) public tokenChainId;\n    mapping(address => address) public tokenToToken;\n    mapping(address => bool) public excludeFeeFromListing;\n    mapping(address => mapping(address => bool)) public isMintable;\n    mapping(uint256 => mapping(address => uint256)) public inNonce;\n    mapping(address => mapping(address => address)) public tokenOwner;\n    mapping(address => mapping(address => uint256)) public tokenDeposited;\n    mapping(address => mapping(address => uint256)) public tokenWithdrawn;\n    mapping(uint256 => mapping(address => mapping(uint256 => bool))) public nonceProcessed;\n\n    event Locked(address indexed user, address indexed inToken, address indexed outToken, uint256 amount, uint256 feeAmount, uint256 _nonce, uint256 isWrapped, uint256 srcId, uint256 dstId);\n    event UnLocked(address indexed user, address indexed outToken, uint256 amount, uint256 feeAmount, uint256 _nonce, uint256 srcId, uint256 dstId);\n    event TokenListed(address indexed baseToken, uint256 baseTokenChain, address indexed correspondingToken, uint256 correspondingTokenChain, bool isMintable, address indexed user);\n    event TokenDelisted(address indexed baseToken, uint256 baseTokenChain, address indexed correspondingToken, uint256 correspondingTokenChain);\n    event TokenDeposited(address indexed user, uint256 amount);\n    event TokenWithdrawn(address indexed user, address indexed receiver, uint256 amount);\n    event SignersChanged(address[] indexed newSigners);\n    event ChainSupported(uint256 _chain, bool _supported);\n    event FeeExcludedFromListing(address indexed user, bool ifExcluded);\n    event TokenFee(address indexed _token, uint256 _fee);\n\n    mapping(uint256 => mapping(uint256 => mapping(address => bool))) public isWrappedWithChainId;\n    mapping(uint256 => mapping(uint256 => mapping(address => mapping(address => address)))) public tokenOwnerWithChainId;\n    mapping(uint256 => mapping(uint256 => mapping(address => address))) public tokenToTokenWithChainId;\n    mapping(uint256 => mapping(uint256 => mapping(address => mapping(address => bool)))) public isMintableWithChainId;\n    mapping(address => address) public _tokenOwner;\n\n    address public native;                          // 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE\n\n    constructor() {\n        _disableInitializers();\n    }\n\n    function initialize(address[] memory _admin, uint256 _listingFee, address _tokenFeeCollector, address _listingFeeCollector, address _router, address _factory, address _usdt) external initializer {\n        require(_admin.length >= 3, \"MINIMUM_SIGNERS_SHOULD_BE_3\");\n        require(_listingFee > 0, \"LISTING_FEE_CANT_BE_ZERO\");\n        require(_tokenFeeCollector != address(0) && _listingFeeCollector != address(0), \"CANT_PROVIDE_ZERO_ADDRESS\");\n        __Ownable_init();\n        __ReentrancyGuard_init();\n        admin = _admin;\n        listingFee = _listingFee;\n        tokenFeeCollector = _tokenFeeCollector;\n        listingFeeCollector = _listingFeeCollector;\n        router = IUniswapV2Router02(_router);\n        factory = _factory;\n        usdt = _usdt;\n        thresholdLimit = 100 * 10**6;\n        // native = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;\n    }\n\n    /** \n     * @dev cannot receive eth directly\n     */\n    receive() external payable {\n        revert(\"DIRECT_ETH_TRANSFER_NOT_SUPPORTED\");\n    }\n\n     /** \n     * @dev cannot receive eth directly\n     */\n    fallback() external payable {\n        revert(\"DIRECT_ETH_TRANSFER_NOT_SUPPORTED\");\n    }\n\n\n    /**\n     * @dev Lock the `_amount` of `inTokens` in the bridge contract for `dstId` chain.\n     * @param inToken locking token address\n     * @param _amount amount of token to lock\n     * @param dstId destination chain on which user will claim token\n     * Emits a {Locked} event.\n     */\n    function lock(address inToken, uint256 _amount, uint256 dstId) external payable nonReentrant {\n        require(_amount > 0, \"AMOUNT_CANT_BE_ZERO\");    \n        require(inToken != address(0), \"TOKEN_ADDRESS_CANT_BE_NULL\");\n        // require(inToken.code.length > 0, \"TOKEN_NOT_ON_THIS_CHAIN\");\n        \n        require(chainSupported[dstId], \"INVALID_CHAIN\");\n\n        uint256 srcId;\n        assembly {\n            srcId := chainid()\n        }\n\n        address outToken = tokenToTokenWithChainId[srcId][dstId][inToken];\n        require(outToken != address(0), \"UNSUPPORTED_TOKEN\");\n\n        uint256 _isWrapped;\n\n        if(isWrappedWithChainId[srcId][dstId][inToken]) _isWrapped = 1;\n        else if(inToken == native || outToken == native) _isWrapped =2;\n        else _isWrapped = 0;\n        \n        address _user = msg.sender;\n        uint256 tokenAmount;\n        uint256 fee = feesForToken[inToken];\n        uint256 feesAmount;\n        \n\n        if(_isWrapped == 0) {\n                \n                (tokenAmount, feesAmount) = transferAndCalcAmountAndFees(inToken, _user, _amount, fee);\n\n                emit Locked(_user, inToken, outToken, tokenAmount, feesAmount, inNonce[dstId][_user]++, _isWrapped, srcId, dstId);\n\n        } else if(_isWrapped == 1) {\n\n                (tokenAmount, feesAmount) = transferAndCalcAmountAndFees(inToken, _user, _amount, fee);\n\n                burn(inToken, tokenAmount+feesAmount);\n\n                emit Locked(_user, inToken, outToken, tokenAmount, feesAmount, inNonce[dstId][_user]++, _isWrapped, srcId, dstId);\n            \n        } else if (_isWrapped == 2) {\n\n            if(inToken == native) {\n                tokenAmount = _amount;\n                fee = feesForToken[inToken];\n\n                if(fee > 0) {\n                    feesAmount = _amount * fee / 100;\n                    tokenAmount -= feesAmount;\n                }\n                require(_amount == msg.value, \"LESS_LOCKING\");\n\n                emit Locked(_user, inToken, outToken, tokenAmount, feesAmount, inNonce[dstId][_user]++, _isWrapped, srcId, dstId);\n            } else {\n                (tokenAmount, feesAmount) = transferAndCalcAmountAndFees(inToken, _user, _amount, fee);\n\n                emit Locked(_user, inToken, outToken, tokenAmount, feesAmount, inNonce[dstId][_user]++, _isWrapped, srcId, dstId);\n            }\n\n        }\n\n    }\n\n\n\n\n    /**\n     * @dev Unlock the `amount` of tokens corresponding to `inToken`\n     * @param inToken locked token address\n     * @param amount amount of token to unlock\n     * @param feeAmount fee on locked amount on source chain\n     * @param _nonce user lock nonce on source chain\n     * @param _isWrapped 1 if inToken is mintable otherwise 0\n     * @param srcId source chain on which user has locked token\n     * @param r[] r part of the signature of the signers\n     * @param s[] s part of the signature of the signers\n     * @param v[] v part of the signature of the signers\n     * Emits a {unLocked} event.\n     */\n    function unlock(address inToken, uint256 amount, uint256 feeAmount, uint256 _nonce, uint256 _isWrapped, uint256 srcId, bytes32[] memory r, bytes32[] memory s, uint8[] memory v) external payable nonReentrant {\n        address user = msg.sender;\n        require(inToken != address(0), \"TOKEN_ADDRESS_CANT_BE_NULL\");\n        require(user != address(0), \"INVALID_RECEIVER\");\n        require(amount > 0, \"AMOUNT_CANT_BE_ZERO\");\n\n        require(!nonceProcessed[srcId][user][_nonce], \"NONCE_ALREADY_PROCESSED\");\n        require(chainSupported[srcId], \"INVALID_CHAIN\");\n        \n\n        uint256 dstId;\n        assembly {\n            dstId := chainid()\n        }\n\n        address outToken = tokenToTokenWithChainId[srcId][dstId][inToken];\n        require(outToken != address(0), \"UNSUPPORTED_TOKEN\");\n\n        bool mintable = isMintableWithChainId[srcId][dstId][inToken][outToken];\n\n        bool success = verify(address(this), user, inToken, outToken, _nonce, amount, feeAmount, _isWrapped, srcId, dstId, r, s, v);\n        require(success, \"INVALID_RECOVERED_SIGNER\");\n        if(!mintable && outToken !=native) require((IERC20(outToken).balanceOf(address(this)) - tokenTax[outToken]) >= (amount + feeAmount), \"INSUFFICIENT_LIQUIDITY_IN_BRIDGE\");\n\n        // inToken is base token then isWrapped = 0\n        // inToken is wrapped token then isWrapped = 1\n\n        nonceProcessed[srcId][user][_nonce] = true;\n\n        if(_isWrapped == 0) {\n\n            if(mintable) {\n                if(feeAmount > 0) mint(outToken, tokenFeeCollector, feeAmount);\n                mint(outToken, user, amount);\n            } else {\n                if(feeAmount > 0) {\n                    tokenTax[outToken] += feeAmount;\n                }\n                success = IERC20(outToken).transfer(user, amount);\n                if(!success) revert(\"TOKEN_TRANSFER_FAILED\");\n            }\n\n            \n        } else if(_isWrapped == 1) {\n            if(outToken == native) {\n                require(address(this).balance >= amount+feeAmount, \"INSUFFICIENT_FUND_IN_BRIDE\");\n                if(feeAmount > 0) {\n                    (success, ) = payable(tokenFeeCollector).call{value: feeAmount}(\"\");\n                    require(success, \"FEE_TRANSFER_FAILED\");\n                }\n\n                (success, ) = payable(user).call{value: amount}(\"\");\n                require(success, \"NATIVE_COIN_TRANSFER_FAILED\");\n            } else {\n\n                if(feeAmount > 0) {\n                    tokenTax[outToken] += feeAmount;\n                }\n                success = IERC20(outToken).transfer(user, amount);\n                if(!success) revert(\"TOKEN_TRANSFER_FAILED\");\n            }\n\n        } else if(_isWrapped == 2) {\n            if(outToken == native) {\n                require(address(this).balance >= amount+feeAmount, \"INSUFFICIENT_FUND_IN_BRIDE\");\n                if(feeAmount > 0) {\n                    (success, ) = payable(tokenFeeCollector).call{value: feeAmount}(\"\");\n                    require(success, \"FEE_TRANSFER_FAILED\");\n                }\n\n                (success, ) = payable(user).call{value: amount}(\"\");\n                require(success, \"NATIVE_COIN_TRANSFER_FAILED\");\n\n            } else if(mintable) {\n                if(feeAmount > 0) mint(outToken, tokenFeeCollector, feeAmount);\n                mint(outToken, user, amount);\n            } else {\n                if(feeAmount > 0) {\n                    tokenTax[outToken] += feeAmount;\n                }\n                success = IERC20(outToken).transfer(user, amount);\n                if(!success) revert(\"TOKEN_TRANSFER_FAILED\");\n            }\n        }\n\n        if(outToken != native && IUniswapV2Factory(router.factory()).getPair(outToken, router.WETH()) != address(0) && tokenTax[outToken] > 0) {\n            address[] memory path = new address[](3);\n            path[0] = outToken;\n            path[1] = router.WETH();\n            path[2] = usdt;\n            uint _amount = router.getAmountsOut(tokenTax[outToken], path)[2];\n            if(_amount >= thresholdLimit) {\n                swapTokensForETH(outToken, tokenTax[outToken], router.WETH());\n                tokenTax[outToken] = 0;\n            }\n            \n        } else if(outToken != native && IUniswapV2Factory(router.factory()).getPair(outToken, usdt) != address(0) && tokenTax[outToken] > 0) {\n            address[] memory path = new address[](2);\n            path[0] = outToken;\n            path[1] = usdt;\n            uint _amount = router.getAmountsOut(tokenTax[outToken], path)[1];\n            if(_amount >= thresholdLimit) {\n                swapTokensForETH(outToken, tokenTax[outToken], usdt);\n                tokenTax[outToken] = 0;\n            }\n        }\n    \n        emit UnLocked(user, outToken, amount,  feeAmount, _nonce, srcId, dstId);\n    }\n\n    function swapTokensForETH(address _token, uint256 _amount, address pairToken) internal {\n        \n        safeApprove(_token, address(router), _amount);\n        if(pairToken == router.WETH()) {\n            address[] memory path = new address[](2);\n            path[0] = _token;\n            path[1] = pairToken;\n            router.swapExactTokensForETHSupportingFeeOnTransferTokens(_amount, 0, path, tokenFeeCollector, block.timestamp);\n\n        } else {\n                address[] memory path = new address[](3);\n                path[0] = _token;\n                path[1] = usdt;\n                path[2] = router.WETH();\n            router.swapExactTokensForETHSupportingFeeOnTransferTokens(_amount, 0, path, tokenFeeCollector, block.timestamp);\n\n        }\n\n    }\n\n    function safeApprove(address token, address to, uint value) internal {\n        // bytes4(keccak256(bytes('approve(address,uint256)')));\n        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x095ea7b3, to, value));\n        require(success && (data.length == 0 || abi.decode(data, (bool))), \"APPROVE_FAILED\");\n    }\n\n\n\n\n    /**\n     * @dev internal function to call mint function of the token address\n     */\n    function mint(address token, address to, uint256 amount) internal {\n        bytes memory init = returnHash(to, amount);\n        if (init.length > 0) call(init, token);\n                    \n    }\n\n    /**\n     * @dev internal function to call burn function of the token address\n     */\n    function burn(address token, uint256 amount) internal {\n        bytes memory init = returnHash(amount);\n        if (init.length > 0) call(init, token);\n                    \n    }\n    \n    /**\n     * @dev function to calculate the fees amount and transfer token from user to this contract\n     */\n    function transferAndCalcAmountAndFees(address token, address _user, uint256 amount, uint256 fee) private returns(uint256 tokenAmount, uint256 feeAmount) {\n\n                uint256 beforeAmount = (IERC20(token).balanceOf(address(this)));\n                bool success = IERC20(token).transferFrom(_user, address(this), amount);\n                if(!success) revert(\"TRANSFER_FAILED_WHILE_LOCKING\");\n                tokenAmount = (IERC20(token).balanceOf(address(this))) - beforeAmount;\n            \n                if(fee > 0) {\n                    feeAmount = tokenAmount * fee / 10000;\n                    tokenAmount -= feeAmount;\n                }\n    }\n\n    /**\n     * @dev function to verify the authenticity of the signatures provided in form of r[], s[] and v[] \n     */\n\n    function verify(address dstContract, address user, address inToken, address outToken, uint256 nonce, uint256 amount, uint256 feeAmount, uint256 _isWrapped, uint256 srcId, uint256 dstId, bytes32[] memory sigR, bytes32[] memory sigS, uint8[] memory sigV) internal view returns (bool) {\n        uint256 len = admin.length;\n        require(sigR.length == len && sigS.length == len && sigV.length == len, \"INVALID_NUMBER_OF_SIGNERS\");\n        for(uint i=0; i<len; ++i) {\n            bytes32 hash = prefixed(keccak256(abi.encodePacked(dstContract, user, inToken, outToken, nonce, amount, feeAmount, _isWrapped, srcId, dstId)));\n            address signer = ecrecover(hash, sigV[i], sigR[i], sigS[i]);\n            require(signer != address(0), \"INVALID_SIGNATURE\");\n            require(admin[i] == signer, \"INVALID_VALIDATOR\");\n        }\n        return true;\n    }\n    /**\n     * @dev making hash EIP-191 compatible\n     */\n    function prefixed(bytes32 hash) internal pure returns (bytes32) {\n        return keccak256(abi.encodePacked(\"\\x19Ethereum Signed Message:\\n32\", hash));\n    }\n\n    /**\n     * @dev returning the encoded mint function to call\n     */\n    function returnHash(address to, uint256 amount) internal pure returns(bytes memory data) {\n        data = abi.encodeWithSignature(\"mint(address,uint256)\", to, amount);\n    }\n\n     /**\n     * @dev calling the `token` contract with `callData`\n     */\n    function call(bytes memory callData, address token) internal {\n        IERC20 _token = IERC20(payable(token));\n        assembly \n                    {\n                        if eq(call(gas(), _token, 0, add(callData, 0x20), mload(callData), 0, 0), 0) {\n                            revert(0, 0)\n                        }\n                    }\n    }\n\n    /**\n     * @dev returning the encoded mint function to call\n     */\n    function returnHash(uint256 amount) internal pure returns(bytes memory data) {\n        data = abi.encodeWithSignature(\"burn(uint256)\", amount);\n    }\n\n    /**\n     * @dev token owner can list the pair of their token with their corresponding chain id\n     * @param baseToken struct that contains token address and its corresponding chain id\n     * @param correspondingToken struct that contains token address and its corresponding chain id\n     * @param _isMintable if corresponding token address is mintable then its `true` otherwise `false`\n     */\n    function listToken(tokenInfo memory baseToken, tokenInfo memory correspondingToken, bool _isMintable) external payable {\n        address _baseToken = baseToken.token;\n        address _correspondingToken = correspondingToken.token;\n        require(_baseToken != address(0), \"INVALID_ADDR\");\n        require(_correspondingToken != address(0), \"INVALID_ADDR\");\n        require(tokenToTokenWithChainId[baseToken.chain][correspondingToken.chain][_baseToken] == address(0) && tokenToTokenWithChainId[baseToken.chain][correspondingToken.chain][_correspondingToken] == address(0), \"THIS_PAIR_ALREADY_LISTED\");\n\n        isMintableWithChainId[baseToken.chain][correspondingToken.chain][_baseToken][_correspondingToken] = _isMintable;\n        isMintableWithChainId[baseToken.chain][correspondingToken.chain][_correspondingToken][_baseToken] = _isMintable;\n        isMintableWithChainId[correspondingToken.chain][baseToken.chain][_baseToken][_correspondingToken] = _isMintable;\n        isMintableWithChainId[correspondingToken.chain][baseToken.chain][_correspondingToken][_baseToken] = _isMintable;\n\n        tokenToTokenWithChainId[baseToken.chain][correspondingToken.chain][_baseToken] = _correspondingToken;\n        tokenToTokenWithChainId[baseToken.chain][correspondingToken.chain][_correspondingToken] = _baseToken;\n        tokenToTokenWithChainId[correspondingToken.chain][baseToken.chain][_baseToken] = _correspondingToken;\n        tokenToTokenWithChainId[correspondingToken.chain][baseToken.chain][_correspondingToken] = _baseToken;\n\n\n        if(_isMintable) {\n            isWrappedWithChainId[baseToken.chain][correspondingToken.chain][_correspondingToken] = true;\n            isWrappedWithChainId[correspondingToken.chain][baseToken.chain][_correspondingToken] = true;\n            isWrapped[_correspondingToken] = true;\n\n        }\n\n        tokenOwnerWithChainId[baseToken.chain][correspondingToken.chain][_baseToken][_correspondingToken] = msg.sender;\n        tokenOwnerWithChainId[baseToken.chain][correspondingToken.chain][_correspondingToken][_baseToken] = msg.sender;\n        tokenOwnerWithChainId[correspondingToken.chain][baseToken.chain][_baseToken][_correspondingToken] = msg.sender;\n        tokenOwnerWithChainId[correspondingToken.chain][baseToken.chain][_correspondingToken][_baseToken] = msg.sender;\n\n        if(_baseToken == _correspondingToken) _tokenOwner[_baseToken] = msg.sender;\n        else {\n            if(_baseToken.code.length > 0) _tokenOwner[_baseToken] = msg.sender;\n            else _tokenOwner[_correspondingToken] = msg.sender;\n        }\n\n        if(!excludeFeeFromListing[msg.sender]) transferListingFee(listingFeeCollector, msg.sender, msg.value);\n\n        emit TokenListed(_baseToken, baseToken.chain, _correspondingToken, correspondingToken.chain, _isMintable, msg.sender);\n\n    }\n\n    /**\n     * @dev platform owner can delist the pair of the token\n     * @param baseToken struct that contains token address and its corresponding chain id\n     * @param correspondingToken struct that contains token address and its corresponding chain id\n     */\n    function delistTokenByOwner(tokenInfo memory baseToken, tokenInfo memory correspondingToken) external onlyOwner {\n        address _baseToken = baseToken.token;\n        address _correspondingToken = correspondingToken.token;\n        require(_baseToken != address(0), \"INVALID_ADDR\");\n        require(_correspondingToken != address(0), \"INVALID_ADDR\");\n        require(tokenToTokenWithChainId[baseToken.chain][correspondingToken.chain][_baseToken] != address(0) && tokenToTokenWithChainId[baseToken.chain][correspondingToken.chain][_correspondingToken] != address(0), \"THIS_PAIR_ALREADY_LISTED\");\n\n        delete tokenToTokenWithChainId[baseToken.chain][correspondingToken.chain][_baseToken];\n        delete tokenToTokenWithChainId[baseToken.chain][correspondingToken.chain][_correspondingToken];\n        delete tokenToTokenWithChainId[correspondingToken.chain][baseToken.chain][_baseToken];\n        delete tokenToTokenWithChainId[correspondingToken.chain][baseToken.chain][_correspondingToken];\n\n        delete tokenOwnerWithChainId[baseToken.chain][correspondingToken.chain][_baseToken][_correspondingToken];\n        delete tokenOwnerWithChainId[baseToken.chain][correspondingToken.chain][_correspondingToken][_baseToken];\n        delete tokenOwnerWithChainId[correspondingToken.chain][baseToken.chain][_baseToken][_correspondingToken];\n        delete tokenOwnerWithChainId[correspondingToken.chain][baseToken.chain][_correspondingToken][_baseToken];\n\n        emit TokenDelisted(_baseToken, baseToken.chain, _correspondingToken, correspondingToken.chain);\n    }\n\n    /**\n     * @dev token lister can delist the pair of the token\n     * @param baseToken struct that contains token address and its corresponding chain id\n     * @param correspondingToken struct that contains token address and its corresponding chain id\n     */\n    function delistTokenByUser(tokenInfo memory baseToken, tokenInfo memory correspondingToken) external {\n        address _baseToken = baseToken.token;\n        address _correspondingToken = correspondingToken.token;\n        // require(tokenOwnerWithChainId[baseToken.chain][correspondingToken.chain][_baseToken][_correspondingToken] == msg.sender, \"NOT_TOKEN_OWNER\");\n        require(_tokenOwner[_baseToken] == msg.sender || _tokenOwner[_correspondingToken] == msg.sender, \"NOT_TOKEN_OWNER\");\n        require(tokenToTokenWithChainId[baseToken.chain][correspondingToken.chain][_baseToken] != address(0) && tokenToTokenWithChainId[baseToken.chain][correspondingToken.chain][_correspondingToken] != address(0), \"ALREADY_DELISTED\");\n\n        require(_baseToken != address(0), \"INVALID_ADDR\");\n        require(_correspondingToken != address(0), \"INVALID_ADDR\");\n\n        delete tokenToTokenWithChainId[baseToken.chain][correspondingToken.chain][_baseToken];\n        delete tokenToTokenWithChainId[baseToken.chain][correspondingToken.chain][_correspondingToken];\n        delete tokenToTokenWithChainId[correspondingToken.chain][baseToken.chain][_baseToken];\n        delete tokenToTokenWithChainId[correspondingToken.chain][baseToken.chain][_correspondingToken];\n\n        delete tokenOwnerWithChainId[baseToken.chain][correspondingToken.chain][_baseToken][_correspondingToken];\n        delete tokenOwnerWithChainId[baseToken.chain][correspondingToken.chain][_correspondingToken][_baseToken];\n        delete tokenOwnerWithChainId[correspondingToken.chain][baseToken.chain][_baseToken][_correspondingToken];\n        delete tokenOwnerWithChainId[correspondingToken.chain][baseToken.chain][_correspondingToken][_baseToken];\n\n        emit TokenDelisted(_baseToken, baseToken.chain, _correspondingToken, correspondingToken.chain);\n    }\n\n    /**\n     * @dev take the listing fee while listing token\n     */\n    function transferListingFee(address to, address _user,  uint256 _value) private nonReentrant {\n        require(to != address(0), \"CANT_SEND_TO_NULL_ADDRESS\");\n        require(_value >= listingFee, \"INCREASE_LISTING_FEE\");\n        (bool success, ) = payable(to).call{value:listingFee}(\"\");\n        require(success, \"LISTING_FEE_TRANSFER_FAILED\");\n        uint256 remainingEth = _value - listingFee;\n        if (remainingEth > 0) {\n            (success,) = payable(_user).call{value: remainingEth}(\"\");\n            require(success, \"REFUND_REMAINING_ETHER_SENT_FAILED\");\n        }\n    }\n\n\n    /**\n    * @dev owner can change the listing fee\n    */\n    function setListingFee(uint256 newFee) external onlyOwner {\n        require(newFee != listingFee, \"SAME_FEE_PROVIDED\");\n        require(newFee >= 0, \"INVALID_FEE\");\n        listingFee = newFee;\n    }\n\n    /**\n    * @dev owner can change the listing fee collector address\n    */\n    function setListingFeeCollector(address collector) external onlyOwner {\n        require(collector != address(0), \"CANT_BE_NULL_ADDRESS\");\n        listingFeeCollector = collector;\n    }\n\n    /**\n    * @dev owner can exclude particular address to give the listing fee while listing token\n    */\n    function setExcludeFeeFromListing(address user, bool ifExcluded) external onlyOwner {\n        require(user != address(0), \"CANT_BE_NULL_ADDRESS\");\n        // require(!excludeFeeFromListing[user], \"ALREADY_EXCLUDED\");\n        bool _previousState = excludeFeeFromListing[user];\n\n        if(_previousState == ifExcluded) revert(\"ALREADY_SET\");\n        else excludeFeeFromListing[user] = ifExcluded;\n\n        emit FeeExcludedFromListing(user, ifExcluded);\n    }\n\n    /**\n    * @dev owner can change the signer addresses \n    */\n    function changeAdmin(address[] memory newAdmin) external onlyOwner {\n        require(newAdmin.length >= 3, \"VALIDATORS_ARE_LESS_THAN_3\");\n        admin = newAdmin;\n\n        emit SignersChanged(newAdmin);\n    }\n\n    /**\n    * @dev owner can set fee for particular token for bridging \n    */\n    function setFeeForToken(address token, uint256 fee) external onlyOwner {\n        require(token != address(0), \"INVALID_TOKEN\");\n        require(fee < 10000, \"FEE_CANT_BE_100%\");\n        feesForToken[token] = fee;\n\n        emit TokenFee(token, fee);\n    }\n\n    /**\n    * @dev owner can set if particular chain is supported or not \n    */\n    function setChainSupported(uint256 chainId, bool supported) external onlyOwner {\n        require(chainId != 0, \"INVALID_CHAIN_ID\");\n        chainSupported[chainId] = supported;\n        emit ChainSupported(chainId, supported);\n    }\n\n     /**\n    * @dev owner can change the token fee collector address\n    */\n    function setFeeCollector(address collector) external onlyOwner {\n        require(collector != address(0), \"INVALID_OWNER\");\n        tokenFeeCollector = collector;\n    }\n\n     /**\n    * @dev returns total number of signers that are verified while unlocking the tokens \n    */\n    function getTotalSigners() external view returns(uint256) {\n        return admin.length;\n    }\n\n    /**\n    * @dev token lister has to deposit tokens if none of the listed token are mintable or burnable\n    * @param token token address to deposit in bridge contract \n    * @param amount amount of tokens to deposit in bridge contract\n    */\n    function depositTokens(address token, uint256 amount) external payable {\n        // address _correspondingToken = tokenToTokenWithChainId[srcId][dstId][token];\n        // require(_correspondingToken != address(0), \"TOKEN_NOT_LISTED\");\n        require(amount > 0, \"AMOUNT_CANT_BE_ZERO\");\n        address user = msg.sender;\n        require(user == _tokenOwner[token], \"ONLY_LISTER_CAN_DEPOSIT\");\n        // require(user == tokenOwnerWithChainId[srcId][dstId][token][_correspondingToken], \"ONLY_LISTER_CAN_DEPOSIT\");\n        uint256 actualBal;\n        if(token != native) {\n            require(token.code.length > 0, \"TOKEN_NOT_DEPLOYED_ON_THIS_CHAIN\");\n            uint256 beforeBal = IERC20(token).balanceOf(address(this));\n            IERC20(token).transferFrom(user, address(this), amount);\n            actualBal = IERC20(token).balanceOf(address(this)) - beforeBal;\n        } else actualBal = msg.value;\n\n        emit TokenDeposited(user, actualBal);\n    }\n\n    /**\n    * @dev token lister can withdraw tokens \n    * @param token token address to withdraw from bridge contract \n    * @param receiver address to recive the withdrawn tokens\n    * @param amount amount of tokens to deposit in bridge contract\n    */\n    function withdrawTokens(address token, address receiver, uint256 amount) external {\n        // require(token.code.length > 0, \"TOKEN_NOT_DEPLOYED_ON_THIS_CHAIN\");\n        // address _correspondingToken = tokenToTokenWithChainId[srcId][dstId][token];\n        require(token != address(0), \"TOKEN_NOT_LISTED\");\n        require(amount > 0, \"AMOUNT_CANT_BE_ZERO\");\n        address user = msg.sender;\n        require(user == _tokenOwner[token], \"ONLY_TOKEN_LISTER_CAN_WITHDRAW\");\n        // require(user == tokenOwnerWithChainId[srcId][dstId][token][_correspondingToken], \"ONLY_TOKEN_LISTER_CAN_WITHDRAW\");\n\n        if(token != native) {\n\n            require(amount <= (IERC20(token).balanceOf(address(this)) - tokenTax[token]), \"WITHDRAW_LESS\");\n\n            if(isWrapped[token]) revert(\"CANT_WITHDRAW_WRAPPED_TOKENS\");\n\n            IERC20(token).transfer(receiver, amount);\n        } else {\n            require(amount <= address(this).balance, \"WITHDRAW_LESS\");\n            (bool success, ) = payable(receiver).call{value: amount}(\"\");\n            require(success, \"WITHDRAW_FAILED\");\n        }\n\n        emit TokenWithdrawn(user, receiver, amount);\n    }\n\n    function claimTax(address token, bool pairWithEth, bool withdrawAnyAmount) external onlyOwner {\n\n        if(pairWithEth && tokenTax[token] > 0) {\n            address[] memory path = new address[](3);\n            path[0] = token;\n            path[1] = router.WETH();\n            path[2] = usdt;\n            uint _amount = router.getAmountsOut(tokenTax[token], path)[2];\n            if(_amount >= thresholdLimit || withdrawAnyAmount) {\n                swapTokensForETH(token, tokenTax[token], router.WETH());\n                tokenTax[token] = 0;\n            }\n            \n        } else if(!pairWithEth && tokenTax[token] > 0) {\n            address[] memory path = new address[](2);\n            path[0] = token;\n            path[1] = usdt;\n            uint _amount = router.getAmountsOut(tokenTax[token], path)[1];\n            if(_amount >= thresholdLimit || withdrawAnyAmount) {\n                swapTokensForETH(token, tokenTax[token], usdt);\n                tokenTax[token] = 0;\n            }\n        }\n    }\n\n    function viewTax(address token, bool pairWithEth) external view returns(uint _amount) {\n\n        if(pairWithEth && tokenTax[token] > 0) {\n            address[] memory path = new address[](3);\n            path[0] = token;\n            path[1] = router.WETH();\n            path[2] = usdt;\n            _amount = router.getAmountsOut(tokenTax[token], path)[2];\n           \n            \n        } else if(!pairWithEth && tokenTax[token] > 0) {\n            address[] memory path = new address[](2);\n            path[0] = token;\n            path[1] = usdt;\n            _amount = router.getAmountsOut(tokenTax[token], path)[1];\n           \n        } else _amount = 0;\n    }\n\n    /**\n    * @dev token lister can change their ownership of listing tokens\n    * @param token token address to change its lister owner\n    * @param newOwner new owner address\n    */\n    function changeTokenLister(address token, address newOwner, uint256 srcId, uint256 dstId) external {\n        require(token.code.length > 0, \"TOKEN_NOT_DEPLOYED_ON_THIS_CHAIN\");\n        require(newOwner != address(0), \"NEW_OWNER_CANT_BE_NULL\");\n        address _correspondingToken = tokenToTokenWithChainId[srcId][dstId][token];\n        require(_correspondingToken != address(0), \"TOKEN_NOT_LISTED\");\n        address user = msg.sender;\n        require(tokenOwnerWithChainId[srcId][dstId][token][_correspondingToken] == user, \"ONLY_TOKEN_LISTER_CAN_CHANGE\");\n\n        tokenOwnerWithChainId[srcId][dstId][token][_correspondingToken] = newOwner;\n        tokenOwnerWithChainId[srcId][dstId][_correspondingToken][token] = newOwner;\n        tokenOwnerWithChainId[dstId][srcId][token][_correspondingToken] = newOwner;\n        tokenOwnerWithChainId[dstId][srcId][_correspondingToken][token] = newOwner;\n    }\n\n    /**\n    * @dev returns the addresses of signers\n    */\n    function getSigners() external view returns(address[] memory ) {\n        return admin;\n    }\n\n    function setThresholdLimit(uint256 _amount) external onlyOwner {\n        thresholdLimit = _amount;\n    }\n\n    function setRouter(address _router) external onlyOwner {\n        router = IUniswapV2Router02(_router);\n    }\n\n    function setUsdt(address _usdt) external onlyOwner {\n        require(_usdt != address(0), \"CANT_BE_NULL_ADDRESS\");\n        usdt = _usdt;\n    }\n\n    function setNative(address _native) external onlyOwner {\n        require(_native != address(0), \"CANT_BE_NULL_ADDRESS\");\n        native = _native;\n    }\n\n    function migrateData(tokenInfo memory baseToken, tokenInfo memory correspondingToken, bool _isMintable, address lister) external onlyOwner {\n        address _baseToken = baseToken.token;\n        address _correspondingToken = correspondingToken.token;\n        require(_baseToken != address(0), \"INVALID_ADDR\");\n        require(_correspondingToken != address(0), \"INVALID_ADDR\");\n        require(tokenToTokenWithChainId[baseToken.chain][correspondingToken.chain][_baseToken] == address(0) && tokenToTokenWithChainId[baseToken.chain][correspondingToken.chain][_correspondingToken] == address(0), \"THIS_PAIR_ALREADY_LISTED\");\n\n        isMintableWithChainId[baseToken.chain][correspondingToken.chain][_baseToken][_correspondingToken] = _isMintable;\n        isMintableWithChainId[baseToken.chain][correspondingToken.chain][_correspondingToken][_baseToken] = _isMintable;\n        isMintableWithChainId[correspondingToken.chain][baseToken.chain][_baseToken][_correspondingToken] = _isMintable;\n        isMintableWithChainId[correspondingToken.chain][baseToken.chain][_correspondingToken][_baseToken] = _isMintable;\n\n        tokenToTokenWithChainId[baseToken.chain][correspondingToken.chain][_baseToken] = _correspondingToken;\n        tokenToTokenWithChainId[baseToken.chain][correspondingToken.chain][_correspondingToken] = _baseToken;\n        tokenToTokenWithChainId[correspondingToken.chain][baseToken.chain][_baseToken] = _correspondingToken;\n        tokenToTokenWithChainId[correspondingToken.chain][baseToken.chain][_correspondingToken] = _baseToken;\n\n\n        if(_isMintable) {\n            isWrappedWithChainId[baseToken.chain][correspondingToken.chain][_correspondingToken] = true;\n            isWrappedWithChainId[correspondingToken.chain][baseToken.chain][_correspondingToken] = true;\n            isWrapped[_correspondingToken] = true;\n\n        }\n\n        tokenOwnerWithChainId[baseToken.chain][correspondingToken.chain][_baseToken][_correspondingToken] = lister;\n        tokenOwnerWithChainId[baseToken.chain][correspondingToken.chain][_correspondingToken][_baseToken] = lister;\n        tokenOwnerWithChainId[correspondingToken.chain][baseToken.chain][_baseToken][_correspondingToken] = lister;\n        tokenOwnerWithChainId[correspondingToken.chain][baseToken.chain][_correspondingToken][_baseToken] = lister;\n\n        if(_baseToken == _correspondingToken) _tokenOwner[_baseToken] = lister;\n        else {\n            if(_baseToken.code.length > 0) _tokenOwner[_baseToken] = lister;\n            else _tokenOwner[_correspondingToken] = lister;\n        }\n    }\n    \n}"
      }
    },
    "settings": {
      "optimizer": {
        "enabled": true,
        "runs": 200
      },
      "viaIR": true,
      "evmVersion": "paris",
      "outputSelection": {
        "*": {
          "*": [
            "evm.bytecode",
            "evm.deployedBytecode",
            "devdoc",
            "userdoc",
            "metadata",
            "abi"
          ]
        }
      },
      "libraries": {}
    }
  }}