creation_sourcecode: {{
    "language": "Solidity",
    "sources": {
      "@layerzerolabs/solidity-examples/contracts/libraries/BytesLib.sol": {
        "content": "// SPDX-License-Identifier: Unlicense\n/*\n * @title Solidity Bytes Arrays Utils\n * @author Gonçalo Sá <goncalo.sa@consensys.net>\n *\n * @dev Bytes tightly packed arrays utility library for ethereum contracts written in Solidity.\n *      The library lets you concatenate, slice and type cast bytes arrays both in memory and storage.\n */\npragma solidity >=0.8.0 <0.9.0;\n\nlibrary BytesLib {\n    function concat(bytes memory _preBytes, bytes memory _postBytes) internal pure returns (bytes memory) {\n        bytes memory tempBytes;\n\n        assembly {\n            // Get a location of some free memory and store it in tempBytes as\n            // Solidity does for memory variables.\n            tempBytes := mload(0x40)\n\n            // Store the length of the first bytes array at the beginning of\n            // the memory for tempBytes.\n            let length := mload(_preBytes)\n            mstore(tempBytes, length)\n\n            // Maintain a memory counter for the current write location in the\n            // temp bytes array by adding the 32 bytes for the array length to\n            // the starting location.\n            let mc := add(tempBytes, 0x20)\n            // Stop copying when the memory counter reaches the length of the\n            // first bytes array.\n            let end := add(mc, length)\n\n            for {\n                // Initialize a copy counter to the start of the _preBytes data,\n                // 32 bytes into its memory.\n                let cc := add(_preBytes, 0x20)\n            } lt(mc, end) {\n                // Increase both counters by 32 bytes each iteration.\n                mc := add(mc, 0x20)\n                cc := add(cc, 0x20)\n            } {\n                // Write the _preBytes data into the tempBytes memory 32 bytes\n                // at a time.\n                mstore(mc, mload(cc))\n            }\n\n            // Add the length of _postBytes to the current length of tempBytes\n            // and store it as the new length in the first 32 bytes of the\n            // tempBytes memory.\n            length := mload(_postBytes)\n            mstore(tempBytes, add(length, mload(tempBytes)))\n\n            // Move the memory counter back from a multiple of 0x20 to the\n            // actual end of the _preBytes data.\n            mc := end\n            // Stop copying when the memory counter reaches the new combined\n            // length of the arrays.\n            end := add(mc, length)\n\n            for {\n                let cc := add(_postBytes, 0x20)\n            } lt(mc, end) {\n                mc := add(mc, 0x20)\n                cc := add(cc, 0x20)\n            } {\n                mstore(mc, mload(cc))\n            }\n\n            // Update the free-memory pointer by padding our last write location\n            // to 32 bytes: add 31 bytes to the end of tempBytes to move to the\n            // next 32 byte block, then round down to the nearest multiple of\n            // 32. If the sum of the length of the two arrays is zero then add\n            // one before rounding down to leave a blank 32 bytes (the length block with 0).\n            mstore(\n                0x40,\n                and(\n                    add(add(end, iszero(add(length, mload(_preBytes)))), 31),\n                    not(31) // Round down to the nearest 32 bytes.\n                )\n            )\n        }\n\n        return tempBytes;\n    }\n\n    function concatStorage(bytes storage _preBytes, bytes memory _postBytes) internal {\n        assembly {\n            // Read the first 32 bytes of _preBytes storage, which is the length\n            // of the array. (We don't need to use the offset into the slot\n            // because arrays use the entire slot.)\n            let fslot := sload(_preBytes.slot)\n            // Arrays of 31 bytes or less have an even value in their slot,\n            // while longer arrays have an odd value. The actual length is\n            // the slot divided by two for odd values, and the lowest order\n            // byte divided by two for even values.\n            // If the slot is even, bitwise and the slot with 255 and divide by\n            // two to get the length. If the slot is odd, bitwise and the slot\n            // with -1 and divide by two.\n            let slength := div(and(fslot, sub(mul(0x100, iszero(and(fslot, 1))), 1)), 2)\n            let mlength := mload(_postBytes)\n            let newlength := add(slength, mlength)\n            // slength can contain both the length and contents of the array\n            // if length < 32 bytes so let's prepare for that\n            // v. http://solidity.readthedocs.io/en/latest/miscellaneous.html#layout-of-state-variables-in-storage\n            switch add(lt(slength, 32), lt(newlength, 32))\n            case 2 {\n                // Since the new array still fits in the slot, we just need to\n                // update the contents of the slot.\n                // uint256(bytes_storage) = uint256(bytes_storage) + uint256(bytes_memory) + new_length\n                sstore(\n                    _preBytes.slot,\n                    // all the modifications to the slot are inside this\n                    // next block\n                    add(\n                        // we can just add to the slot contents because the\n                        // bytes we want to change are the LSBs\n                        fslot,\n                        add(\n                            mul(\n                                div(\n                                    // load the bytes from memory\n                                    mload(add(_postBytes, 0x20)),\n                                    // zero all bytes to the right\n                                    exp(0x100, sub(32, mlength))\n                                ),\n                                // and now shift left the number of bytes to\n                                // leave space for the length in the slot\n                                exp(0x100, sub(32, newlength))\n                            ),\n                            // increase length by the double of the memory\n                            // bytes length\n                            mul(mlength, 2)\n                        )\n                    )\n                )\n            }\n            case 1 {\n                // The stored value fits in the slot, but the combined value\n                // will exceed it.\n                // get the keccak hash to get the contents of the array\n                mstore(0x0, _preBytes.slot)\n                let sc := add(keccak256(0x0, 0x20), div(slength, 32))\n\n                // save new length\n                sstore(_preBytes.slot, add(mul(newlength, 2), 1))\n\n                // The contents of the _postBytes array start 32 bytes into\n                // the structure. Our first read should obtain the `submod`\n                // bytes that can fit into the unused space in the last word\n                // of the stored array. To get this, we read 32 bytes starting\n                // from `submod`, so the data we read overlaps with the array\n                // contents by `submod` bytes. Masking the lowest-order\n                // `submod` bytes allows us to add that value directly to the\n                // stored value.\n\n                let submod := sub(32, slength)\n                let mc := add(_postBytes, submod)\n                let end := add(_postBytes, mlength)\n                let mask := sub(exp(0x100, submod), 1)\n\n                sstore(sc, add(and(fslot, 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff00), and(mload(mc), mask)))\n\n                for {\n                    mc := add(mc, 0x20)\n                    sc := add(sc, 1)\n                } lt(mc, end) {\n                    sc := add(sc, 1)\n                    mc := add(mc, 0x20)\n                } {\n                    sstore(sc, mload(mc))\n                }\n\n                mask := exp(0x100, sub(mc, end))\n\n                sstore(sc, mul(div(mload(mc), mask), mask))\n            }\n            default {\n                // get the keccak hash to get the contents of the array\n                mstore(0x0, _preBytes.slot)\n                // Start copying to the last used word of the stored array.\n                let sc := add(keccak256(0x0, 0x20), div(slength, 32))\n\n                // save new length\n                sstore(_preBytes.slot, add(mul(newlength, 2), 1))\n\n                // Copy over the first `submod` bytes of the new data as in\n                // case 1 above.\n                let slengthmod := mod(slength, 32)\n                let mlengthmod := mod(mlength, 32)\n                let submod := sub(32, slengthmod)\n                let mc := add(_postBytes, submod)\n                let end := add(_postBytes, mlength)\n                let mask := sub(exp(0x100, submod), 1)\n\n                sstore(sc, add(sload(sc), and(mload(mc), mask)))\n\n                for {\n                    sc := add(sc, 1)\n                    mc := add(mc, 0x20)\n                } lt(mc, end) {\n                    sc := add(sc, 1)\n                    mc := add(mc, 0x20)\n                } {\n                    sstore(sc, mload(mc))\n                }\n\n                mask := exp(0x100, sub(mc, end))\n\n                sstore(sc, mul(div(mload(mc), mask), mask))\n            }\n        }\n    }\n\n    function slice(\n        bytes memory _bytes,\n        uint _start,\n        uint _length\n    ) internal pure returns (bytes memory) {\n        require(_length + 31 >= _length, \"slice_overflow\");\n        require(_bytes.length >= _start + _length, \"slice_outOfBounds\");\n\n        bytes memory tempBytes;\n\n        assembly {\n            switch iszero(_length)\n            case 0 {\n                // Get a location of some free memory and store it in tempBytes as\n                // Solidity does for memory variables.\n                tempBytes := mload(0x40)\n\n                // The first word of the slice result is potentially a partial\n                // word read from the original array. To read it, we calculate\n                // the length of that partial word and start copying that many\n                // bytes into the array. The first word we copy will start with\n                // data we don't care about, but the last `lengthmod` bytes will\n                // land at the beginning of the contents of the new array. When\n                // we're done copying, we overwrite the full first word with\n                // the actual length of the slice.\n                let lengthmod := and(_length, 31)\n\n                // The multiplication in the next line is necessary\n                // because when slicing multiples of 32 bytes (lengthmod == 0)\n                // the following copy loop was copying the origin's length\n                // and then ending prematurely not copying everything it should.\n                let mc := add(add(tempBytes, lengthmod), mul(0x20, iszero(lengthmod)))\n                let end := add(mc, _length)\n\n                for {\n                    // The multiplication in the next line has the same exact purpose\n                    // as the one above.\n                    let cc := add(add(add(_bytes, lengthmod), mul(0x20, iszero(lengthmod))), _start)\n                } lt(mc, end) {\n                    mc := add(mc, 0x20)\n                    cc := add(cc, 0x20)\n                } {\n                    mstore(mc, mload(cc))\n                }\n\n                mstore(tempBytes, _length)\n\n                //update free-memory pointer\n                //allocating the array padded to 32 bytes like the compiler does now\n                mstore(0x40, and(add(mc, 31), not(31)))\n            }\n            //if we want a zero-length slice let's just return a zero-length array\n            default {\n                tempBytes := mload(0x40)\n                //zero out the 32 bytes slice we are about to return\n                //we need to do it because Solidity does not garbage collect\n                mstore(tempBytes, 0)\n\n                mstore(0x40, add(tempBytes, 0x20))\n            }\n        }\n\n        return tempBytes;\n    }\n\n    function toAddress(bytes memory _bytes, uint _start) internal pure returns (address) {\n        require(_bytes.length >= _start + 20, \"toAddress_outOfBounds\");\n        address tempAddress;\n\n        assembly {\n            tempAddress := div(mload(add(add(_bytes, 0x20), _start)), 0x1000000000000000000000000)\n        }\n\n        return tempAddress;\n    }\n\n    function toUint8(bytes memory _bytes, uint _start) internal pure returns (uint8) {\n        require(_bytes.length >= _start + 1, \"toUint8_outOfBounds\");\n        uint8 tempUint;\n\n        assembly {\n            tempUint := mload(add(add(_bytes, 0x1), _start))\n        }\n\n        return tempUint;\n    }\n\n    function toUint16(bytes memory _bytes, uint _start) internal pure returns (uint16) {\n        require(_bytes.length >= _start + 2, \"toUint16_outOfBounds\");\n        uint16 tempUint;\n\n        assembly {\n            tempUint := mload(add(add(_bytes, 0x2), _start))\n        }\n\n        return tempUint;\n    }\n\n    function toUint32(bytes memory _bytes, uint _start) internal pure returns (uint32) {\n        require(_bytes.length >= _start + 4, \"toUint32_outOfBounds\");\n        uint32 tempUint;\n\n        assembly {\n            tempUint := mload(add(add(_bytes, 0x4), _start))\n        }\n\n        return tempUint;\n    }\n\n    function toUint64(bytes memory _bytes, uint _start) internal pure returns (uint64) {\n        require(_bytes.length >= _start + 8, \"toUint64_outOfBounds\");\n        uint64 tempUint;\n\n        assembly {\n            tempUint := mload(add(add(_bytes, 0x8), _start))\n        }\n\n        return tempUint;\n    }\n\n    function toUint96(bytes memory _bytes, uint _start) internal pure returns (uint96) {\n        require(_bytes.length >= _start + 12, \"toUint96_outOfBounds\");\n        uint96 tempUint;\n\n        assembly {\n            tempUint := mload(add(add(_bytes, 0xc), _start))\n        }\n\n        return tempUint;\n    }\n\n    function toUint128(bytes memory _bytes, uint _start) internal pure returns (uint128) {\n        require(_bytes.length >= _start + 16, \"toUint128_outOfBounds\");\n        uint128 tempUint;\n\n        assembly {\n            tempUint := mload(add(add(_bytes, 0x10), _start))\n        }\n\n        return tempUint;\n    }\n\n    function toUint256(bytes memory _bytes, uint _start) internal pure returns (uint) {\n        require(_bytes.length >= _start + 32, \"toUint256_outOfBounds\");\n        uint tempUint;\n\n        assembly {\n            tempUint := mload(add(add(_bytes, 0x20), _start))\n        }\n\n        return tempUint;\n    }\n\n    function toBytes32(bytes memory _bytes, uint _start) internal pure returns (bytes32) {\n        require(_bytes.length >= _start + 32, \"toBytes32_outOfBounds\");\n        bytes32 tempBytes32;\n\n        assembly {\n            tempBytes32 := mload(add(add(_bytes, 0x20), _start))\n        }\n\n        return tempBytes32;\n    }\n\n    function equal(bytes memory _preBytes, bytes memory _postBytes) internal pure returns (bool) {\n        bool success = true;\n\n        assembly {\n            let length := mload(_preBytes)\n\n            // if lengths don't match the arrays are not equal\n            switch eq(length, mload(_postBytes))\n            case 1 {\n                // cb is a circuit breaker in the for loop since there's\n                //  no said feature for inline assembly loops\n                // cb = 1 - don't breaker\n                // cb = 0 - break\n                let cb := 1\n\n                let mc := add(_preBytes, 0x20)\n                let end := add(mc, length)\n\n                for {\n                    let cc := add(_postBytes, 0x20)\n                    // the next line is the loop condition:\n                    // while(uint256(mc < end) + cb == 2)\n                } eq(add(lt(mc, end), cb), 2) {\n                    mc := add(mc, 0x20)\n                    cc := add(cc, 0x20)\n                } {\n                    // if any of these checks fails then arrays are not equal\n                    if iszero(eq(mload(mc), mload(cc))) {\n                        // unsuccess:\n                        success := 0\n                        cb := 0\n                    }\n                }\n            }\n            default {\n                // unsuccess:\n                success := 0\n            }\n        }\n\n        return success;\n    }\n\n    function equalStorage(bytes storage _preBytes, bytes memory _postBytes) internal view returns (bool) {\n        bool success = true;\n\n        assembly {\n            // we know _preBytes_offset is 0\n            let fslot := sload(_preBytes.slot)\n            // Decode the length of the stored array like in concatStorage().\n            let slength := div(and(fslot, sub(mul(0x100, iszero(and(fslot, 1))), 1)), 2)\n            let mlength := mload(_postBytes)\n\n            // if lengths don't match the arrays are not equal\n            switch eq(slength, mlength)\n            case 1 {\n                // slength can contain both the length and contents of the array\n                // if length < 32 bytes so let's prepare for that\n                // v. http://solidity.readthedocs.io/en/latest/miscellaneous.html#layout-of-state-variables-in-storage\n                if iszero(iszero(slength)) {\n                    switch lt(slength, 32)\n                    case 1 {\n                        // blank the last byte which is the length\n                        fslot := mul(div(fslot, 0x100), 0x100)\n\n                        if iszero(eq(fslot, mload(add(_postBytes, 0x20)))) {\n                            // unsuccess:\n                            success := 0\n                        }\n                    }\n                    default {\n                        // cb is a circuit breaker in the for loop since there's\n                        //  no said feature for inline assembly loops\n                        // cb = 1 - don't breaker\n                        // cb = 0 - break\n                        let cb := 1\n\n                        // get the keccak hash to get the contents of the array\n                        mstore(0x0, _preBytes.slot)\n                        let sc := keccak256(0x0, 0x20)\n\n                        let mc := add(_postBytes, 0x20)\n                        let end := add(mc, mlength)\n\n                        // the next line is the loop condition:\n                        // while(uint256(mc < end) + cb == 2)\n                        for {\n\n                        } eq(add(lt(mc, end), cb), 2) {\n                            sc := add(sc, 1)\n                            mc := add(mc, 0x20)\n                        } {\n                            if iszero(eq(sload(sc), mload(mc))) {\n                                // unsuccess:\n                                success := 0\n                                cb := 0\n                            }\n                        }\n                    }\n                }\n            }\n            default {\n                // unsuccess:\n                success := 0\n            }\n        }\n\n        return success;\n    }\n}\n"
      },
      "@layerzerolabs/solidity-examples/contracts/libraries/ExcessivelySafeCall.sol": {
        "content": "// SPDX-License-Identifier: MIT OR Apache-2.0\npragma solidity >=0.7.6;\n\nlibrary ExcessivelySafeCall {\n    uint constant LOW_28_MASK = 0x00000000ffffffffffffffffffffffffffffffffffffffffffffffffffffffff;\n\n    /// @notice Use when you _really_ really _really_ don't trust the called\n    /// contract. This prevents the called contract from causing reversion of\n    /// the caller in as many ways as we can.\n    /// @dev The main difference between this and a solidity low-level call is\n    /// that we limit the number of bytes that the callee can cause to be\n    /// copied to caller memory. This prevents stupid things like malicious\n    /// contracts returning 10,000,000 bytes causing a local OOG when copying\n    /// to memory.\n    /// @param _target The address to call\n    /// @param _gas The amount of gas to forward to the remote contract\n    /// @param _maxCopy The maximum number of bytes of returndata to copy\n    /// to memory.\n    /// @param _calldata The data to send to the remote contract\n    /// @return success and returndata, as `.call()`. Returndata is capped to\n    /// `_maxCopy` bytes.\n    function excessivelySafeCall(\n        address _target,\n        uint _gas,\n        uint16 _maxCopy,\n        bytes memory _calldata\n    ) internal returns (bool, bytes memory) {\n        // set up for assembly call\n        uint _toCopy;\n        bool _success;\n        bytes memory _returnData = new bytes(_maxCopy);\n        // dispatch message to recipient\n        // by assembly calling \"handle\" function\n        // we call via assembly to avoid memcopying a very large returndata\n        // returned by a malicious contract\n        assembly {\n            _success := call(\n                _gas, // gas\n                _target, // recipient\n                0, // ether value\n                add(_calldata, 0x20), // inloc\n                mload(_calldata), // inlen\n                0, // outloc\n                0 // outlen\n            )\n            // limit our copy to 256 bytes\n            _toCopy := returndatasize()\n            if gt(_toCopy, _maxCopy) {\n                _toCopy := _maxCopy\n            }\n            // Store the length of the copied bytes\n            mstore(_returnData, _toCopy)\n            // copy the bytes from returndata[0:_toCopy]\n            returndatacopy(add(_returnData, 0x20), 0, _toCopy)\n        }\n        return (_success, _returnData);\n    }\n\n    /// @notice Use when you _really_ really _really_ don't trust the called\n    /// contract. This prevents the called contract from causing reversion of\n    /// the caller in as many ways as we can.\n    /// @dev The main difference between this and a solidity low-level call is\n    /// that we limit the number of bytes that the callee can cause to be\n    /// copied to caller memory. This prevents stupid things like malicious\n    /// contracts returning 10,000,000 bytes causing a local OOG when copying\n    /// to memory.\n    /// @param _target The address to call\n    /// @param _gas The amount of gas to forward to the remote contract\n    /// @param _maxCopy The maximum number of bytes of returndata to copy\n    /// to memory.\n    /// @param _calldata The data to send to the remote contract\n    /// @return success and returndata, as `.call()`. Returndata is capped to\n    /// `_maxCopy` bytes.\n    function excessivelySafeStaticCall(\n        address _target,\n        uint _gas,\n        uint16 _maxCopy,\n        bytes memory _calldata\n    ) internal view returns (bool, bytes memory) {\n        // set up for assembly call\n        uint _toCopy;\n        bool _success;\n        bytes memory _returnData = new bytes(_maxCopy);\n        // dispatch message to recipient\n        // by assembly calling \"handle\" function\n        // we call via assembly to avoid memcopying a very large returndata\n        // returned by a malicious contract\n        assembly {\n            _success := staticcall(\n                _gas, // gas\n                _target, // recipient\n                add(_calldata, 0x20), // inloc\n                mload(_calldata), // inlen\n                0, // outloc\n                0 // outlen\n            )\n            // limit our copy to 256 bytes\n            _toCopy := returndatasize()\n            if gt(_toCopy, _maxCopy) {\n                _toCopy := _maxCopy\n            }\n            // Store the length of the copied bytes\n            mstore(_returnData, _toCopy)\n            // copy the bytes from returndata[0:_toCopy]\n            returndatacopy(add(_returnData, 0x20), 0, _toCopy)\n        }\n        return (_success, _returnData);\n    }\n\n    /**\n     * @notice Swaps function selectors in encoded contract calls\n     * @dev Allows reuse of encoded calldata for functions with identical\n     * argument types but different names. It simply swaps out the first 4 bytes\n     * for the new selector. This function modifies memory in place, and should\n     * only be used with caution.\n     * @param _newSelector The new 4-byte selector\n     * @param _buf The encoded contract args\n     */\n    function swapSelector(bytes4 _newSelector, bytes memory _buf) internal pure {\n        require(_buf.length >= 4);\n        uint _mask = LOW_28_MASK;\n        assembly {\n            // load the first word of\n            let _word := mload(add(_buf, 0x20))\n            // mask out the top 4 bytes\n            // /x\n            _word := and(_word, _mask)\n            _word := or(_newSelector, _word)\n            mstore(add(_buf, 0x20), _word)\n        }\n    }\n}\n"
      },
      "@layerzerolabs/solidity-examples/contracts/lzApp/interfaces/ILayerZeroEndpoint.sol": {
        "content": "// SPDX-License-Identifier: MIT\n\npragma solidity >=0.5.0;\n\nimport \"./ILayerZeroUserApplicationConfig.sol\";\n\ninterface ILayerZeroEndpoint is ILayerZeroUserApplicationConfig {\n    // @notice send a LayerZero message to the specified address at a LayerZero endpoint.\n    // @param _dstChainId - the destination chain identifier\n    // @param _destination - the address on destination chain (in bytes). address length/format may vary by chains\n    // @param _payload - a custom bytes payload to send to the destination contract\n    // @param _refundAddress - if the source transaction is cheaper than the amount of value passed, refund the additional amount to this address\n    // @param _zroPaymentAddress - the address of the ZRO token holder who would pay for the transaction\n    // @param _adapterParams - parameters for custom functionality. e.g. receive airdropped native gas from the relayer on destination\n    function send(\n        uint16 _dstChainId,\n        bytes calldata _destination,\n        bytes calldata _payload,\n        address payable _refundAddress,\n        address _zroPaymentAddress,\n        bytes calldata _adapterParams\n    ) external payable;\n\n    // @notice used by the messaging library to publish verified payload\n    // @param _srcChainId - the source chain identifier\n    // @param _srcAddress - the source contract (as bytes) at the source chain\n    // @param _dstAddress - the address on destination chain\n    // @param _nonce - the unbound message ordering nonce\n    // @param _gasLimit - the gas limit for external contract execution\n    // @param _payload - verified payload to send to the destination contract\n    function receivePayload(\n        uint16 _srcChainId,\n        bytes calldata _srcAddress,\n        address _dstAddress,\n        uint64 _nonce,\n        uint _gasLimit,\n        bytes calldata _payload\n    ) external;\n\n    // @notice get the inboundNonce of a lzApp from a source chain which could be EVM or non-EVM chain\n    // @param _srcChainId - the source chain identifier\n    // @param _srcAddress - the source chain contract address\n    function getInboundNonce(uint16 _srcChainId, bytes calldata _srcAddress) external view returns (uint64);\n\n    // @notice get the outboundNonce from this source chain which, consequently, is always an EVM\n    // @param _srcAddress - the source chain contract address\n    function getOutboundNonce(uint16 _dstChainId, address _srcAddress) external view returns (uint64);\n\n    // @notice gets a quote in source native gas, for the amount that send() requires to pay for message delivery\n    // @param _dstChainId - the destination chain identifier\n    // @param _userApplication - the user app address on this EVM chain\n    // @param _payload - the custom message to send over LayerZero\n    // @param _payInZRO - if false, user app pays the protocol fee in native token\n    // @param _adapterParam - parameters for the adapter service, e.g. send some dust native token to dstChain\n    function estimateFees(\n        uint16 _dstChainId,\n        address _userApplication,\n        bytes calldata _payload,\n        bool _payInZRO,\n        bytes calldata _adapterParam\n    ) external view returns (uint nativeFee, uint zroFee);\n\n    // @notice get this Endpoint's immutable source identifier\n    function getChainId() external view returns (uint16);\n\n    // @notice the interface to retry failed message on this Endpoint destination\n    // @param _srcChainId - the source chain identifier\n    // @param _srcAddress - the source chain contract address\n    // @param _payload - the payload to be retried\n    function retryPayload(\n        uint16 _srcChainId,\n        bytes calldata _srcAddress,\n        bytes calldata _payload\n    ) external;\n\n    // @notice query if any STORED payload (message blocking) at the endpoint.\n    // @param _srcChainId - the source chain identifier\n    // @param _srcAddress - the source chain contract address\n    function hasStoredPayload(uint16 _srcChainId, bytes calldata _srcAddress) external view returns (bool);\n\n    // @notice query if the _libraryAddress is valid for sending msgs.\n    // @param _userApplication - the user app address on this EVM chain\n    function getSendLibraryAddress(address _userApplication) external view returns (address);\n\n    // @notice query if the _libraryAddress is valid for receiving msgs.\n    // @param _userApplication - the user app address on this EVM chain\n    function getReceiveLibraryAddress(address _userApplication) external view returns (address);\n\n    // @notice query if the non-reentrancy guard for send() is on\n    // @return true if the guard is on. false otherwise\n    function isSendingPayload() external view returns (bool);\n\n    // @notice query if the non-reentrancy guard for receive() is on\n    // @return true if the guard is on. false otherwise\n    function isReceivingPayload() external view returns (bool);\n\n    // @notice get the configuration of the LayerZero messaging library of the specified version\n    // @param _version - messaging library version\n    // @param _chainId - the chainId for the pending config change\n    // @param _userApplication - the contract address of the user application\n    // @param _configType - type of configuration. every messaging library has its own convention.\n    function getConfig(\n        uint16 _version,\n        uint16 _chainId,\n        address _userApplication,\n        uint _configType\n    ) external view returns (bytes memory);\n\n    // @notice get the send() LayerZero messaging library version\n    // @param _userApplication - the contract address of the user application\n    function getSendVersion(address _userApplication) external view returns (uint16);\n\n    // @notice get the lzReceive() LayerZero messaging library version\n    // @param _userApplication - the contract address of the user application\n    function getReceiveVersion(address _userApplication) external view returns (uint16);\n}\n"
      },
      "@layerzerolabs/solidity-examples/contracts/lzApp/interfaces/ILayerZeroReceiver.sol": {
        "content": "// SPDX-License-Identifier: MIT\n\npragma solidity >=0.5.0;\n\ninterface ILayerZeroReceiver {\n    // @notice LayerZero endpoint will invoke this function to deliver the message on the destination\n    // @param _srcChainId - the source endpoint identifier\n    // @param _srcAddress - the source sending contract address from the source chain\n    // @param _nonce - the ordered message nonce\n    // @param _payload - the signed payload is the UA bytes has encoded to be sent\n    function lzReceive(\n        uint16 _srcChainId,\n        bytes calldata _srcAddress,\n        uint64 _nonce,\n        bytes calldata _payload\n    ) external;\n}\n"
      },
      "@layerzerolabs/solidity-examples/contracts/lzApp/interfaces/ILayerZeroUserApplicationConfig.sol": {
        "content": "// SPDX-License-Identifier: MIT\n\npragma solidity >=0.5.0;\n\ninterface ILayerZeroUserApplicationConfig {\n    // @notice set the configuration of the LayerZero messaging library of the specified version\n    // @param _version - messaging library version\n    // @param _chainId - the chainId for the pending config change\n    // @param _configType - type of configuration. every messaging library has its own convention.\n    // @param _config - configuration in the bytes. can encode arbitrary content.\n    function setConfig(\n        uint16 _version,\n        uint16 _chainId,\n        uint _configType,\n        bytes calldata _config\n    ) external;\n\n    // @notice set the send() LayerZero messaging library version to _version\n    // @param _version - new messaging library version\n    function setSendVersion(uint16 _version) external;\n\n    // @notice set the lzReceive() LayerZero messaging library version to _version\n    // @param _version - new messaging library version\n    function setReceiveVersion(uint16 _version) external;\n\n    // @notice Only when the UA needs to resume the message flow in blocking mode and clear the stored payload\n    // @param _srcChainId - the chainId of the source chain\n    // @param _srcAddress - the contract address of the source contract at the source chain\n    function forceResumeReceive(uint16 _srcChainId, bytes calldata _srcAddress) external;\n}\n"
      },
      "@layerzerolabs/solidity-examples/contracts/lzApp/LzApp.sol": {
        "content": "// SPDX-License-Identifier: MIT\n\npragma solidity ^0.8.0;\n\nimport \"@openzeppelin/contracts/access/Ownable.sol\";\nimport \"./interfaces/ILayerZeroReceiver.sol\";\nimport \"./interfaces/ILayerZeroUserApplicationConfig.sol\";\nimport \"./interfaces/ILayerZeroEndpoint.sol\";\nimport \"../libraries/BytesLib.sol\";\n\n/*\n * a generic LzReceiver implementation\n */\nabstract contract LzApp is Ownable, ILayerZeroReceiver, ILayerZeroUserApplicationConfig {\n    using BytesLib for bytes;\n\n    // ua can not send payload larger than this by default, but it can be changed by the ua owner\n    uint public constant DEFAULT_PAYLOAD_SIZE_LIMIT = 10000;\n\n    ILayerZeroEndpoint public immutable lzEndpoint;\n    mapping(uint16 => bytes) public trustedRemoteLookup;\n    mapping(uint16 => mapping(uint16 => uint)) public minDstGasLookup;\n    mapping(uint16 => uint) public payloadSizeLimitLookup;\n    address public precrime;\n\n    event SetPrecrime(address precrime);\n    event SetTrustedRemote(uint16 _remoteChainId, bytes _path);\n    event SetTrustedRemoteAddress(uint16 _remoteChainId, bytes _remoteAddress);\n    event SetMinDstGas(uint16 _dstChainId, uint16 _type, uint _minDstGas);\n\n    constructor(address _endpoint) {\n        lzEndpoint = ILayerZeroEndpoint(_endpoint);\n    }\n\n    function lzReceive(\n        uint16 _srcChainId,\n        bytes calldata _srcAddress,\n        uint64 _nonce,\n        bytes calldata _payload\n    ) public virtual override {\n        // lzReceive must be called by the endpoint for security\n        require(_msgSender() == address(lzEndpoint), \"LzApp: invalid endpoint caller\");\n\n        bytes memory trustedRemote = trustedRemoteLookup[_srcChainId];\n        // if will still block the message pathway from (srcChainId, srcAddress). should not receive message from untrusted remote.\n        require(\n            _srcAddress.length == trustedRemote.length && trustedRemote.length > 0 && keccak256(_srcAddress) == keccak256(trustedRemote),\n            \"LzApp: invalid source sending contract\"\n        );\n\n        _blockingLzReceive(_srcChainId, _srcAddress, _nonce, _payload);\n    }\n\n    // abstract function - the default behaviour of LayerZero is blocking. See: NonblockingLzApp if you dont need to enforce ordered messaging\n    function _blockingLzReceive(\n        uint16 _srcChainId,\n        bytes memory _srcAddress,\n        uint64 _nonce,\n        bytes memory _payload\n    ) internal virtual;\n\n    function _lzSend(\n        uint16 _dstChainId,\n        bytes memory _payload,\n        address payable _refundAddress,\n        address _zroPaymentAddress,\n        bytes memory _adapterParams,\n        uint _nativeFee\n    ) internal virtual {\n        bytes memory trustedRemote = trustedRemoteLookup[_dstChainId];\n        require(trustedRemote.length != 0, \"LzApp: destination chain is not a trusted source\");\n        _checkPayloadSize(_dstChainId, _payload.length);\n        lzEndpoint.send{value: _nativeFee}(_dstChainId, trustedRemote, _payload, _refundAddress, _zroPaymentAddress, _adapterParams);\n    }\n\n    function _checkGasLimit(\n        uint16 _dstChainId,\n        uint16 _type,\n        bytes memory _adapterParams,\n        uint _extraGas\n    ) internal view virtual {\n        uint providedGasLimit = _getGasLimit(_adapterParams);\n        uint minGasLimit = minDstGasLookup[_dstChainId][_type];\n        require(minGasLimit > 0, \"LzApp: minGasLimit not set\");\n        require(providedGasLimit >= minGasLimit + _extraGas, \"LzApp: gas limit is too low\");\n    }\n\n    function _getGasLimit(bytes memory _adapterParams) internal pure virtual returns (uint gasLimit) {\n        require(_adapterParams.length >= 34, \"LzApp: invalid adapterParams\");\n        assembly {\n            gasLimit := mload(add(_adapterParams, 34))\n        }\n    }\n\n    function _checkPayloadSize(uint16 _dstChainId, uint _payloadSize) internal view virtual {\n        uint payloadSizeLimit = payloadSizeLimitLookup[_dstChainId];\n        if (payloadSizeLimit == 0) {\n            // use default if not set\n            payloadSizeLimit = DEFAULT_PAYLOAD_SIZE_LIMIT;\n        }\n        require(_payloadSize <= payloadSizeLimit, \"LzApp: payload size is too large\");\n    }\n\n    //---------------------------UserApplication config----------------------------------------\n    function getConfig(\n        uint16 _version,\n        uint16 _chainId,\n        address,\n        uint _configType\n    ) external view returns (bytes memory) {\n        return lzEndpoint.getConfig(_version, _chainId, address(this), _configType);\n    }\n\n    // generic config for LayerZero user Application\n    function setConfig(\n        uint16 _version,\n        uint16 _chainId,\n        uint _configType,\n        bytes calldata _config\n    ) external override onlyOwner {\n        lzEndpoint.setConfig(_version, _chainId, _configType, _config);\n    }\n\n    function setSendVersion(uint16 _version) external override onlyOwner {\n        lzEndpoint.setSendVersion(_version);\n    }\n\n    function setReceiveVersion(uint16 _version) external override onlyOwner {\n        lzEndpoint.setReceiveVersion(_version);\n    }\n\n    function forceResumeReceive(uint16 _srcChainId, bytes calldata _srcAddress) external override onlyOwner {\n        lzEndpoint.forceResumeReceive(_srcChainId, _srcAddress);\n    }\n\n    // _path = abi.encodePacked(remoteAddress, localAddress)\n    // this function set the trusted path for the cross-chain communication\n    function setTrustedRemote(uint16 _remoteChainId, bytes calldata _path) external onlyOwner {\n        trustedRemoteLookup[_remoteChainId] = _path;\n        emit SetTrustedRemote(_remoteChainId, _path);\n    }\n\n    function setTrustedRemoteAddress(uint16 _remoteChainId, bytes calldata _remoteAddress) external onlyOwner {\n        trustedRemoteLookup[_remoteChainId] = abi.encodePacked(_remoteAddress, address(this));\n        emit SetTrustedRemoteAddress(_remoteChainId, _remoteAddress);\n    }\n\n    function getTrustedRemoteAddress(uint16 _remoteChainId) external view returns (bytes memory) {\n        bytes memory path = trustedRemoteLookup[_remoteChainId];\n        require(path.length != 0, \"LzApp: no trusted path record\");\n        return path.slice(0, path.length - 20); // the last 20 bytes should be address(this)\n    }\n\n    function setPrecrime(address _precrime) external onlyOwner {\n        precrime = _precrime;\n        emit SetPrecrime(_precrime);\n    }\n\n    function setMinDstGas(\n        uint16 _dstChainId,\n        uint16 _packetType,\n        uint _minGas\n    ) external onlyOwner {\n        minDstGasLookup[_dstChainId][_packetType] = _minGas;\n        emit SetMinDstGas(_dstChainId, _packetType, _minGas);\n    }\n\n    // if the size is 0, it means default size limit\n    function setPayloadSizeLimit(uint16 _dstChainId, uint _size) external onlyOwner {\n        payloadSizeLimitLookup[_dstChainId] = _size;\n    }\n\n    //--------------------------- VIEW FUNCTION ----------------------------------------\n    function isTrustedRemote(uint16 _srcChainId, bytes calldata _srcAddress) external view returns (bool) {\n        bytes memory trustedSource = trustedRemoteLookup[_srcChainId];\n        return keccak256(trustedSource) == keccak256(_srcAddress);\n    }\n}\n"
      },
      "@layerzerolabs/solidity-examples/contracts/lzApp/NonblockingLzApp.sol": {
        "content": "// SPDX-License-Identifier: MIT\n\npragma solidity ^0.8.0;\n\nimport \"./LzApp.sol\";\nimport \"../libraries/ExcessivelySafeCall.sol\";\n\n/*\n * the default LayerZero messaging behaviour is blocking, i.e. any failed message will block the channel\n * this abstract class try-catch all fail messages and store locally for future retry. hence, non-blocking\n * NOTE: if the srcAddress is not configured properly, it will still block the message pathway from (srcChainId, srcAddress)\n */\nabstract contract NonblockingLzApp is LzApp {\n    using ExcessivelySafeCall for address;\n\n    constructor(address _endpoint) LzApp(_endpoint) {}\n\n    mapping(uint16 => mapping(bytes => mapping(uint64 => bytes32))) public failedMessages;\n\n    event MessageFailed(uint16 _srcChainId, bytes _srcAddress, uint64 _nonce, bytes _payload, bytes _reason);\n    event RetryMessageSuccess(uint16 _srcChainId, bytes _srcAddress, uint64 _nonce, bytes32 _payloadHash);\n\n    // overriding the virtual function in LzReceiver\n    function _blockingLzReceive(\n        uint16 _srcChainId,\n        bytes memory _srcAddress,\n        uint64 _nonce,\n        bytes memory _payload\n    ) internal virtual override {\n        (bool success, bytes memory reason) = address(this).excessivelySafeCall(\n            gasleft(),\n            150,\n            abi.encodeWithSelector(this.nonblockingLzReceive.selector, _srcChainId, _srcAddress, _nonce, _payload)\n        );\n        // try-catch all errors/exceptions\n        if (!success) {\n            _storeFailedMessage(_srcChainId, _srcAddress, _nonce, _payload, reason);\n        }\n    }\n\n    function _storeFailedMessage(\n        uint16 _srcChainId,\n        bytes memory _srcAddress,\n        uint64 _nonce,\n        bytes memory _payload,\n        bytes memory _reason\n    ) internal virtual {\n        failedMessages[_srcChainId][_srcAddress][_nonce] = keccak256(_payload);\n        emit MessageFailed(_srcChainId, _srcAddress, _nonce, _payload, _reason);\n    }\n\n    function nonblockingLzReceive(\n        uint16 _srcChainId,\n        bytes calldata _srcAddress,\n        uint64 _nonce,\n        bytes calldata _payload\n    ) public virtual {\n        // only internal transaction\n        require(_msgSender() == address(this), \"NonblockingLzApp: caller must be LzApp\");\n        _nonblockingLzReceive(_srcChainId, _srcAddress, _nonce, _payload);\n    }\n\n    //@notice override this function\n    function _nonblockingLzReceive(\n        uint16 _srcChainId,\n        bytes memory _srcAddress,\n        uint64 _nonce,\n        bytes memory _payload\n    ) internal virtual;\n\n    function retryMessage(\n        uint16 _srcChainId,\n        bytes calldata _srcAddress,\n        uint64 _nonce,\n        bytes calldata _payload\n    ) public payable virtual {\n        // assert there is message to retry\n        bytes32 payloadHash = failedMessages[_srcChainId][_srcAddress][_nonce];\n        require(payloadHash != bytes32(0), \"NonblockingLzApp: no stored message\");\n        require(keccak256(_payload) == payloadHash, \"NonblockingLzApp: invalid payload\");\n        // clear the stored message\n        failedMessages[_srcChainId][_srcAddress][_nonce] = bytes32(0);\n        // execute the message. revert if it fails again\n        _nonblockingLzReceive(_srcChainId, _srcAddress, _nonce, _payload);\n        emit RetryMessageSuccess(_srcChainId, _srcAddress, _nonce, payloadHash);\n    }\n}\n"
      },
      "@layerzerolabs/solidity-examples/contracts/token/oft/v2/BaseOFTV2.sol": {
        "content": "// SPDX-License-Identifier: MIT\n\npragma solidity ^0.8.0;\n\nimport \"./OFTCoreV2.sol\";\nimport \"./interfaces/IOFTV2.sol\";\nimport \"@openzeppelin/contracts/utils/introspection/ERC165.sol\";\n\nabstract contract BaseOFTV2 is OFTCoreV2, ERC165, IOFTV2 {\n    constructor(uint8 _sharedDecimals, address _lzEndpoint) OFTCoreV2(_sharedDecimals, _lzEndpoint) {}\n\n    /************************************************************************\n     * public functions\n     ************************************************************************/\n    function sendFrom(\n        address _from,\n        uint16 _dstChainId,\n        bytes32 _toAddress,\n        uint _amount,\n        LzCallParams calldata _callParams\n    ) public payable virtual override {\n        _send(_from, _dstChainId, _toAddress, _amount, _callParams.refundAddress, _callParams.zroPaymentAddress, _callParams.adapterParams);\n    }\n\n    function sendAndCall(\n        address _from,\n        uint16 _dstChainId,\n        bytes32 _toAddress,\n        uint _amount,\n        bytes calldata _payload,\n        uint64 _dstGasForCall,\n        LzCallParams calldata _callParams\n    ) public payable virtual override {\n        _sendAndCall(\n            _from,\n            _dstChainId,\n            _toAddress,\n            _amount,\n            _payload,\n            _dstGasForCall,\n            _callParams.refundAddress,\n            _callParams.zroPaymentAddress,\n            _callParams.adapterParams\n        );\n    }\n\n    /************************************************************************\n     * public view functions\n     ************************************************************************/\n    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {\n        return interfaceId == type(IOFTV2).interfaceId || super.supportsInterface(interfaceId);\n    }\n\n    function estimateSendFee(\n        uint16 _dstChainId,\n        bytes32 _toAddress,\n        uint _amount,\n        bool _useZro,\n        bytes calldata _adapterParams\n    ) public view virtual override returns (uint nativeFee, uint zroFee) {\n        return _estimateSendFee(_dstChainId, _toAddress, _amount, _useZro, _adapterParams);\n    }\n\n    function estimateSendAndCallFee(\n        uint16 _dstChainId,\n        bytes32 _toAddress,\n        uint _amount,\n        bytes calldata _payload,\n        uint64 _dstGasForCall,\n        bool _useZro,\n        bytes calldata _adapterParams\n    ) public view virtual override returns (uint nativeFee, uint zroFee) {\n        return _estimateSendAndCallFee(_dstChainId, _toAddress, _amount, _payload, _dstGasForCall, _useZro, _adapterParams);\n    }\n\n    function circulatingSupply() public view virtual override returns (uint);\n\n    function token() public view virtual override returns (address);\n}\n"
      },
      "@layerzerolabs/solidity-examples/contracts/token/oft/v2/interfaces/ICommonOFT.sol": {
        "content": "// SPDX-License-Identifier: MIT\n\npragma solidity >=0.5.0;\n\nimport \"@openzeppelin/contracts/utils/introspection/IERC165.sol\";\n\n/**\n * @dev Interface of the IOFT core standard\n */\ninterface ICommonOFT is IERC165 {\n\n    struct LzCallParams {\n        address payable refundAddress;\n        address zroPaymentAddress;\n        bytes adapterParams;\n    }\n\n    /**\n     * @dev estimate send token `_tokenId` to (`_dstChainId`, `_toAddress`)\n     * _dstChainId - L0 defined chain id to send tokens too\n     * _toAddress - dynamic bytes array which contains the address to whom you are sending tokens to on the dstChain\n     * _amount - amount of the tokens to transfer\n     * _useZro - indicates to use zro to pay L0 fees\n     * _adapterParam - flexible bytes array to indicate messaging adapter services in L0\n     */\n    function estimateSendFee(uint16 _dstChainId, bytes32 _toAddress, uint _amount, bool _useZro, bytes calldata _adapterParams) external view returns (uint nativeFee, uint zroFee);\n\n    function estimateSendAndCallFee(uint16 _dstChainId, bytes32 _toAddress, uint _amount, bytes calldata _payload, uint64 _dstGasForCall, bool _useZro, bytes calldata _adapterParams) external view returns (uint nativeFee, uint zroFee);\n\n    /**\n     * @dev returns the circulating amount of tokens on current chain\n     */\n    function circulatingSupply() external view returns (uint);\n\n    /**\n     * @dev returns the address of the ERC20 token\n     */\n    function token() external view returns (address);\n}\n"
      },
      "@layerzerolabs/solidity-examples/contracts/token/oft/v2/interfaces/IOFTReceiverV2.sol": {
        "content": "// SPDX-License-Identifier: BUSL-1.1\n\npragma solidity >=0.5.0;\n\ninterface IOFTReceiverV2 {\n    /**\n     * @dev Called by the OFT contract when tokens are received from source chain.\n     * @param _srcChainId The chain id of the source chain.\n     * @param _srcAddress The address of the OFT token contract on the source chain.\n     * @param _nonce The nonce of the transaction on the source chain.\n     * @param _from The address of the account who calls the sendAndCall() on the source chain.\n     * @param _amount The amount of tokens to transfer.\n     * @param _payload Additional data with no specified format.\n     */\n    function onOFTReceived(uint16 _srcChainId, bytes calldata _srcAddress, uint64 _nonce, bytes32 _from, uint _amount, bytes calldata _payload) external;\n}\n"
      },
      "@layerzerolabs/solidity-examples/contracts/token/oft/v2/interfaces/IOFTV2.sol": {
        "content": "// SPDX-License-Identifier: MIT\n\npragma solidity >=0.5.0;\n\nimport \"./ICommonOFT.sol\";\n\n/**\n * @dev Interface of the IOFT core standard\n */\ninterface IOFTV2 is ICommonOFT {\n\n    /**\n     * @dev send `_amount` amount of token to (`_dstChainId`, `_toAddress`) from `_from`\n     * `_from` the owner of token\n     * `_dstChainId` the destination chain identifier\n     * `_toAddress` can be any size depending on the `dstChainId`.\n     * `_amount` the quantity of tokens in wei\n     * `_refundAddress` the address LayerZero refunds if too much message fee is sent\n     * `_zroPaymentAddress` set to address(0x0) if not paying in ZRO (LayerZero Token)\n     * `_adapterParams` is a flexible bytes array to indicate messaging adapter services\n     */\n    function sendFrom(address _from, uint16 _dstChainId, bytes32 _toAddress, uint _amount, LzCallParams calldata _callParams) external payable;\n\n    function sendAndCall(address _from, uint16 _dstChainId, bytes32 _toAddress, uint _amount, bytes calldata _payload, uint64 _dstGasForCall, LzCallParams calldata _callParams) external payable;\n}\n"
      },
      "@layerzerolabs/solidity-examples/contracts/token/oft/v2/OFTCoreV2.sol": {
        "content": "// SPDX-License-Identifier: MIT\n\npragma solidity ^0.8.0;\n\nimport \"../../../lzApp/NonblockingLzApp.sol\";\nimport \"../../../libraries/ExcessivelySafeCall.sol\";\nimport \"./interfaces/ICommonOFT.sol\";\nimport \"./interfaces/IOFTReceiverV2.sol\";\n\nabstract contract OFTCoreV2 is NonblockingLzApp {\n    using BytesLib for bytes;\n    using ExcessivelySafeCall for address;\n\n    uint public constant NO_EXTRA_GAS = 0;\n\n    // packet type\n    uint8 public constant PT_SEND = 0;\n    uint8 public constant PT_SEND_AND_CALL = 1;\n\n    uint8 public immutable sharedDecimals;\n\n    mapping(uint16 => mapping(bytes => mapping(uint64 => bool))) public creditedPackets;\n\n    /**\n     * @dev Emitted when `_amount` tokens are moved from the `_sender` to (`_dstChainId`, `_toAddress`)\n     * `_nonce` is the outbound nonce\n     */\n    event SendToChain(uint16 indexed _dstChainId, address indexed _from, bytes32 indexed _toAddress, uint _amount);\n\n    /**\n     * @dev Emitted when `_amount` tokens are received from `_srcChainId` into the `_toAddress` on the local chain.\n     * `_nonce` is the inbound nonce.\n     */\n    event ReceiveFromChain(uint16 indexed _srcChainId, address indexed _to, uint _amount);\n\n    event CallOFTReceivedSuccess(uint16 indexed _srcChainId, bytes _srcAddress, uint64 _nonce, bytes32 _hash);\n\n    event NonContractAddress(address _address);\n\n    // _sharedDecimals should be the minimum decimals on all chains\n    constructor(uint8 _sharedDecimals, address _lzEndpoint) NonblockingLzApp(_lzEndpoint) {\n        sharedDecimals = _sharedDecimals;\n    }\n\n    /************************************************************************\n     * public functions\n     ************************************************************************/\n    function callOnOFTReceived(\n        uint16 _srcChainId,\n        bytes calldata _srcAddress,\n        uint64 _nonce,\n        bytes32 _from,\n        address _to,\n        uint _amount,\n        bytes calldata _payload,\n        uint _gasForCall\n    ) public virtual {\n        require(_msgSender() == address(this), \"OFTCore: caller must be OFTCore\");\n\n        // send\n        _amount = _transferFrom(address(this), _to, _amount);\n        emit ReceiveFromChain(_srcChainId, _to, _amount);\n\n        // call\n        IOFTReceiverV2(_to).onOFTReceived{gas: _gasForCall}(_srcChainId, _srcAddress, _nonce, _from, _amount, _payload);\n    }\n\n    /************************************************************************\n     * internal functions\n     ************************************************************************/\n    function _estimateSendFee(\n        uint16 _dstChainId,\n        bytes32 _toAddress,\n        uint _amount,\n        bool _useZro,\n        bytes memory _adapterParams\n    ) internal view virtual returns (uint nativeFee, uint zroFee) {\n        // mock the payload for sendFrom()\n        bytes memory payload = _encodeSendPayload(_toAddress, _ld2sd(_amount));\n        return lzEndpoint.estimateFees(_dstChainId, address(this), payload, _useZro, _adapterParams);\n    }\n\n    function _estimateSendAndCallFee(\n        uint16 _dstChainId,\n        bytes32 _toAddress,\n        uint _amount,\n        bytes memory _payload,\n        uint64 _dstGasForCall,\n        bool _useZro,\n        bytes memory _adapterParams\n    ) internal view virtual returns (uint nativeFee, uint zroFee) {\n        // mock the payload for sendAndCall()\n        bytes memory payload = _encodeSendAndCallPayload(msg.sender, _toAddress, _ld2sd(_amount), _payload, _dstGasForCall);\n        return lzEndpoint.estimateFees(_dstChainId, address(this), payload, _useZro, _adapterParams);\n    }\n\n    function _nonblockingLzReceive(\n        uint16 _srcChainId,\n        bytes memory _srcAddress,\n        uint64 _nonce,\n        bytes memory _payload\n    ) internal virtual override {\n        uint8 packetType = _payload.toUint8(0);\n\n        if (packetType == PT_SEND) {\n            _sendAck(_srcChainId, _srcAddress, _nonce, _payload);\n        } else if (packetType == PT_SEND_AND_CALL) {\n            _sendAndCallAck(_srcChainId, _srcAddress, _nonce, _payload);\n        } else {\n            revert(\"OFTCore: unknown packet type\");\n        }\n    }\n\n    function _send(\n        address _from,\n        uint16 _dstChainId,\n        bytes32 _toAddress,\n        uint _amount,\n        address payable _refundAddress,\n        address _zroPaymentAddress,\n        bytes memory _adapterParams\n    ) internal virtual returns (uint amount) {\n        _checkGasLimit(_dstChainId, PT_SEND, _adapterParams, NO_EXTRA_GAS);\n\n        (amount, ) = _removeDust(_amount);\n        amount = _debitFrom(_from, _dstChainId, _toAddress, amount); // amount returned should not have dust\n        require(amount > 0, \"OFTCore: amount too small\");\n\n        bytes memory lzPayload = _encodeSendPayload(_toAddress, _ld2sd(amount));\n        _lzSend(_dstChainId, lzPayload, _refundAddress, _zroPaymentAddress, _adapterParams, msg.value);\n\n        emit SendToChain(_dstChainId, _from, _toAddress, amount);\n    }\n\n    function _sendAck(\n        uint16 _srcChainId,\n        bytes memory,\n        uint64,\n        bytes memory _payload\n    ) internal virtual {\n        (address to, uint64 amountSD) = _decodeSendPayload(_payload);\n        if (to == address(0)) {\n            to = address(0xdead);\n        }\n\n        uint amount = _sd2ld(amountSD);\n        amount = _creditTo(_srcChainId, to, amount);\n\n        emit ReceiveFromChain(_srcChainId, to, amount);\n    }\n\n    function _sendAndCall(\n        address _from,\n        uint16 _dstChainId,\n        bytes32 _toAddress,\n        uint _amount,\n        bytes memory _payload,\n        uint64 _dstGasForCall,\n        address payable _refundAddress,\n        address _zroPaymentAddress,\n        bytes memory _adapterParams\n    ) internal virtual returns (uint amount) {\n        _checkGasLimit(_dstChainId, PT_SEND_AND_CALL, _adapterParams, _dstGasForCall);\n\n        (amount, ) = _removeDust(_amount);\n        amount = _debitFrom(_from, _dstChainId, _toAddress, amount);\n        require(amount > 0, \"OFTCore: amount too small\");\n\n        // encode the msg.sender into the payload instead of _from\n        bytes memory lzPayload = _encodeSendAndCallPayload(msg.sender, _toAddress, _ld2sd(amount), _payload, _dstGasForCall);\n        _lzSend(_dstChainId, lzPayload, _refundAddress, _zroPaymentAddress, _adapterParams, msg.value);\n\n        emit SendToChain(_dstChainId, _from, _toAddress, amount);\n    }\n\n    function _sendAndCallAck(\n        uint16 _srcChainId,\n        bytes memory _srcAddress,\n        uint64 _nonce,\n        bytes memory _payload\n    ) internal virtual {\n        (bytes32 from, address to, uint64 amountSD, bytes memory payloadForCall, uint64 gasForCall) = _decodeSendAndCallPayload(_payload);\n\n        bool credited = creditedPackets[_srcChainId][_srcAddress][_nonce];\n        uint amount = _sd2ld(amountSD);\n\n        // credit to this contract first, and then transfer to receiver only if callOnOFTReceived() succeeds\n        if (!credited) {\n            amount = _creditTo(_srcChainId, address(this), amount);\n            creditedPackets[_srcChainId][_srcAddress][_nonce] = true;\n        }\n\n        if (!_isContract(to)) {\n            emit NonContractAddress(to);\n            return;\n        }\n\n        // workaround for stack too deep\n        uint16 srcChainId = _srcChainId;\n        bytes memory srcAddress = _srcAddress;\n        uint64 nonce = _nonce;\n        bytes memory payload = _payload;\n        bytes32 from_ = from;\n        address to_ = to;\n        uint amount_ = amount;\n        bytes memory payloadForCall_ = payloadForCall;\n\n        // no gas limit for the call if retry\n        uint gas = credited ? gasleft() : gasForCall;\n        (bool success, bytes memory reason) = address(this).excessivelySafeCall(\n            gasleft(),\n            150,\n            abi.encodeWithSelector(this.callOnOFTReceived.selector, srcChainId, srcAddress, nonce, from_, to_, amount_, payloadForCall_, gas)\n        );\n\n        if (success) {\n            bytes32 hash = keccak256(payload);\n            emit CallOFTReceivedSuccess(srcChainId, srcAddress, nonce, hash);\n        } else {\n            // store the failed message into the nonblockingLzApp\n            _storeFailedMessage(srcChainId, srcAddress, nonce, payload, reason);\n        }\n    }\n\n    function _isContract(address _account) internal view returns (bool) {\n        return _account.code.length > 0;\n    }\n\n    function _ld2sd(uint _amount) internal view virtual returns (uint64) {\n        uint amountSD = _amount / _ld2sdRate();\n        require(amountSD <= type(uint64).max, \"OFTCore: amountSD overflow\");\n        return uint64(amountSD);\n    }\n\n    function _sd2ld(uint64 _amountSD) internal view virtual returns (uint) {\n        return _amountSD * _ld2sdRate();\n    }\n\n    function _removeDust(uint _amount) internal view virtual returns (uint amountAfter, uint dust) {\n        dust = _amount % _ld2sdRate();\n        amountAfter = _amount - dust;\n    }\n\n    function _encodeSendPayload(bytes32 _toAddress, uint64 _amountSD) internal view virtual returns (bytes memory) {\n        return abi.encodePacked(PT_SEND, _toAddress, _amountSD);\n    }\n\n    function _decodeSendPayload(bytes memory _payload) internal view virtual returns (address to, uint64 amountSD) {\n        require(_payload.toUint8(0) == PT_SEND && _payload.length == 41, \"OFTCore: invalid payload\");\n\n        to = _payload.toAddress(13); // drop the first 12 bytes of bytes32\n        amountSD = _payload.toUint64(33);\n    }\n\n    function _encodeSendAndCallPayload(\n        address _from,\n        bytes32 _toAddress,\n        uint64 _amountSD,\n        bytes memory _payload,\n        uint64 _dstGasForCall\n    ) internal view virtual returns (bytes memory) {\n        return abi.encodePacked(PT_SEND_AND_CALL, _toAddress, _amountSD, _addressToBytes32(_from), _dstGasForCall, _payload);\n    }\n\n    function _decodeSendAndCallPayload(bytes memory _payload)\n        internal\n        view\n        virtual\n        returns (\n            bytes32 from,\n            address to,\n            uint64 amountSD,\n            bytes memory payload,\n            uint64 dstGasForCall\n        )\n    {\n        require(_payload.toUint8(0) == PT_SEND_AND_CALL, \"OFTCore: invalid payload\");\n\n        to = _payload.toAddress(13); // drop the first 12 bytes of bytes32\n        amountSD = _payload.toUint64(33);\n        from = _payload.toBytes32(41);\n        dstGasForCall = _payload.toUint64(73);\n        payload = _payload.slice(81, _payload.length - 81);\n    }\n\n    function _addressToBytes32(address _address) internal pure virtual returns (bytes32) {\n        return bytes32(uint(uint160(_address)));\n    }\n\n    function _debitFrom(\n        address _from,\n        uint16 _dstChainId,\n        bytes32 _toAddress,\n        uint _amount\n    ) internal virtual returns (uint);\n\n    function _creditTo(\n        uint16 _srcChainId,\n        address _toAddress,\n        uint _amount\n    ) internal virtual returns (uint);\n\n    function _transferFrom(\n        address _from,\n        address _to,\n        uint _amount\n    ) internal virtual returns (uint);\n\n    function _ld2sdRate() internal view virtual returns (uint);\n}\n"
      },
      "@layerzerolabs/solidity-examples/contracts/token/oft/v2/OFTV2.sol": {
        "content": "// SPDX-License-Identifier: MIT\n\npragma solidity ^0.8.0;\n\nimport \"@openzeppelin/contracts/token/ERC20/ERC20.sol\";\nimport \"./BaseOFTV2.sol\";\n\ncontract OFTV2 is BaseOFTV2, ERC20 {\n    uint internal immutable ld2sdRate;\n\n    constructor(\n        string memory _name,\n        string memory _symbol,\n        uint8 _sharedDecimals,\n        address _lzEndpoint\n    ) ERC20(_name, _symbol) BaseOFTV2(_sharedDecimals, _lzEndpoint) {\n        uint8 decimals = decimals();\n        require(_sharedDecimals <= decimals, \"OFT: sharedDecimals must be <= decimals\");\n        ld2sdRate = 10**(decimals - _sharedDecimals);\n    }\n\n    /************************************************************************\n     * public functions\n     ************************************************************************/\n    function circulatingSupply() public view virtual override returns (uint) {\n        return totalSupply();\n    }\n\n    function token() public view virtual override returns (address) {\n        return address(this);\n    }\n\n    /************************************************************************\n     * internal functions\n     ************************************************************************/\n    function _debitFrom(\n        address _from,\n        uint16,\n        bytes32,\n        uint _amount\n    ) internal virtual override returns (uint) {\n        address spender = _msgSender();\n        if (_from != spender) _spendAllowance(_from, spender, _amount);\n        _burn(_from, _amount);\n        return _amount;\n    }\n\n    function _creditTo(\n        uint16,\n        address _toAddress,\n        uint _amount\n    ) internal virtual override returns (uint) {\n        _mint(_toAddress, _amount);\n        return _amount;\n    }\n\n    function _transferFrom(\n        address _from,\n        address _to,\n        uint _amount\n    ) internal virtual override returns (uint) {\n        address spender = _msgSender();\n        // if transfer from this contract, no need to check allowance\n        if (_from != address(this) && _from != spender) _spendAllowance(_from, spender, _amount);\n        _transfer(_from, _to, _amount);\n        return _amount;\n    }\n\n    function _ld2sdRate() internal view virtual override returns (uint) {\n        return ld2sdRate;\n    }\n}\n"
      },
      "@openzeppelin/contracts/access/Ownable.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)\n\npragma solidity ^0.8.0;\n\nimport \"../utils/Context.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 Ownable is Context {\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    constructor() {\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 anymore. Can only be called by the current owner.\n     *\n     * NOTE: Renouncing ownership will leave the contract without an owner,\n     * thereby removing 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"
      },
      "@openzeppelin/contracts/token/ERC20/ERC20.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/ERC20.sol)\n\npragma solidity ^0.8.0;\n\nimport \"./IERC20.sol\";\nimport \"./extensions/IERC20Metadata.sol\";\nimport \"../../utils/Context.sol\";\n\n/**\n * @dev Implementation of the {IERC20} interface.\n *\n * This implementation is agnostic to the way tokens are created. This means\n * that a supply mechanism has to be added in a derived contract using {_mint}.\n * For a generic mechanism see {ERC20PresetMinterPauser}.\n *\n * TIP: For a detailed writeup see our guide\n * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How\n * to implement supply mechanisms].\n *\n * We have followed general OpenZeppelin Contracts guidelines: functions revert\n * instead returning `false` on failure. This behavior is nonetheless\n * conventional and does not conflict with the expectations of ERC20\n * applications.\n *\n * Additionally, an {Approval} event is emitted on calls to {transferFrom}.\n * This allows applications to reconstruct the allowance for all accounts just\n * by listening to said events. Other implementations of the EIP may not emit\n * these events, as it isn't required by the specification.\n *\n * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}\n * functions have been added to mitigate the well-known issues around setting\n * allowances. See {IERC20-approve}.\n */\ncontract ERC20 is Context, IERC20, IERC20Metadata {\n    mapping(address => uint256) private _balances;\n\n    mapping(address => mapping(address => uint256)) private _allowances;\n\n    uint256 private _totalSupply;\n\n    string private _name;\n    string private _symbol;\n\n    /**\n     * @dev Sets the values for {name} and {symbol}.\n     *\n     * The default value of {decimals} is 18. To select a different value for\n     * {decimals} you should overload it.\n     *\n     * All two of these values are immutable: they can only be set once during\n     * construction.\n     */\n    constructor(string memory name_, string memory symbol_) {\n        _name = name_;\n        _symbol = symbol_;\n    }\n\n    /**\n     * @dev Returns the name of the token.\n     */\n    function name() public view virtual override returns (string memory) {\n        return _name;\n    }\n\n    /**\n     * @dev Returns the symbol of the token, usually a shorter version of the\n     * name.\n     */\n    function symbol() public view virtual override returns (string memory) {\n        return _symbol;\n    }\n\n    /**\n     * @dev Returns the number of decimals used to get its user representation.\n     * For example, if `decimals` equals `2`, a balance of `505` tokens should\n     * be displayed to a user as `5.05` (`505 / 10 ** 2`).\n     *\n     * Tokens usually opt for a value of 18, imitating the relationship between\n     * Ether and Wei. This is the value {ERC20} uses, unless this function is\n     * overridden;\n     *\n     * NOTE: This information is only used for _display_ purposes: it in\n     * no way affects any of the arithmetic of the contract, including\n     * {IERC20-balanceOf} and {IERC20-transfer}.\n     */\n    function decimals() public view virtual override returns (uint8) {\n        return 18;\n    }\n\n    /**\n     * @dev See {IERC20-totalSupply}.\n     */\n    function totalSupply() public view virtual override returns (uint256) {\n        return _totalSupply;\n    }\n\n    /**\n     * @dev See {IERC20-balanceOf}.\n     */\n    function balanceOf(address account) public view virtual override returns (uint256) {\n        return _balances[account];\n    }\n\n    /**\n     * @dev See {IERC20-transfer}.\n     *\n     * Requirements:\n     *\n     * - `to` cannot be the zero address.\n     * - the caller must have a balance of at least `amount`.\n     */\n    function transfer(address to, uint256 amount) public virtual override returns (bool) {\n        address owner = _msgSender();\n        _transfer(owner, to, amount);\n        return true;\n    }\n\n    /**\n     * @dev See {IERC20-allowance}.\n     */\n    function allowance(address owner, address spender) public view virtual override returns (uint256) {\n        return _allowances[owner][spender];\n    }\n\n    /**\n     * @dev See {IERC20-approve}.\n     *\n     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on\n     * `transferFrom`. This is semantically equivalent to an infinite approval.\n     *\n     * Requirements:\n     *\n     * - `spender` cannot be the zero address.\n     */\n    function approve(address spender, uint256 amount) public virtual override returns (bool) {\n        address owner = _msgSender();\n        _approve(owner, spender, amount);\n        return true;\n    }\n\n    /**\n     * @dev See {IERC20-transferFrom}.\n     *\n     * Emits an {Approval} event indicating the updated allowance. This is not\n     * required by the EIP. See the note at the beginning of {ERC20}.\n     *\n     * NOTE: Does not update the allowance if the current allowance\n     * is the maximum `uint256`.\n     *\n     * Requirements:\n     *\n     * - `from` and `to` cannot be the zero address.\n     * - `from` must have a balance of at least `amount`.\n     * - the caller must have allowance for ``from``'s tokens of at least\n     * `amount`.\n     */\n    function transferFrom(\n        address from,\n        address to,\n        uint256 amount\n    ) public virtual override returns (bool) {\n        address spender = _msgSender();\n        _spendAllowance(from, spender, amount);\n        _transfer(from, to, amount);\n        return true;\n    }\n\n    /**\n     * @dev Atomically increases the allowance granted to `spender` by the caller.\n     *\n     * This is an alternative to {approve} that can be used as a mitigation for\n     * problems described in {IERC20-approve}.\n     *\n     * Emits an {Approval} event indicating the updated allowance.\n     *\n     * Requirements:\n     *\n     * - `spender` cannot be the zero address.\n     */\n    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {\n        address owner = _msgSender();\n        _approve(owner, spender, allowance(owner, spender) + addedValue);\n        return true;\n    }\n\n    /**\n     * @dev Atomically decreases the allowance granted to `spender` by the caller.\n     *\n     * This is an alternative to {approve} that can be used as a mitigation for\n     * problems described in {IERC20-approve}.\n     *\n     * Emits an {Approval} event indicating the updated allowance.\n     *\n     * Requirements:\n     *\n     * - `spender` cannot be the zero address.\n     * - `spender` must have allowance for the caller of at least\n     * `subtractedValue`.\n     */\n    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {\n        address owner = _msgSender();\n        uint256 currentAllowance = allowance(owner, spender);\n        require(currentAllowance >= subtractedValue, \"ERC20: decreased allowance below zero\");\n        unchecked {\n            _approve(owner, spender, currentAllowance - subtractedValue);\n        }\n\n        return true;\n    }\n\n    /**\n     * @dev Moves `amount` of tokens from `from` to `to`.\n     *\n     * This internal function is equivalent to {transfer}, and can be used to\n     * e.g. implement automatic token fees, slashing mechanisms, etc.\n     *\n     * Emits a {Transfer} event.\n     *\n     * Requirements:\n     *\n     * - `from` cannot be the zero address.\n     * - `to` cannot be the zero address.\n     * - `from` must have a balance of at least `amount`.\n     */\n    function _transfer(\n        address from,\n        address to,\n        uint256 amount\n    ) internal virtual {\n        require(from != address(0), \"ERC20: transfer from the zero address\");\n        require(to != address(0), \"ERC20: transfer to the zero address\");\n\n        _beforeTokenTransfer(from, to, amount);\n\n        uint256 fromBalance = _balances[from];\n        require(fromBalance >= amount, \"ERC20: transfer amount exceeds balance\");\n        unchecked {\n            _balances[from] = fromBalance - amount;\n            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by\n            // decrementing then incrementing.\n            _balances[to] += amount;\n        }\n\n        emit Transfer(from, to, amount);\n\n        _afterTokenTransfer(from, to, amount);\n    }\n\n    /** @dev Creates `amount` tokens and assigns them to `account`, increasing\n     * the total supply.\n     *\n     * Emits a {Transfer} event with `from` set to the zero address.\n     *\n     * Requirements:\n     *\n     * - `account` cannot be the zero address.\n     */\n    function _mint(address account, uint256 amount) internal virtual {\n        require(account != address(0), \"ERC20: mint to the zero address\");\n\n        _beforeTokenTransfer(address(0), account, amount);\n\n        _totalSupply += amount;\n        unchecked {\n            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.\n            _balances[account] += amount;\n        }\n        emit Transfer(address(0), account, amount);\n\n        _afterTokenTransfer(address(0), account, amount);\n    }\n\n    /**\n     * @dev Destroys `amount` tokens from `account`, reducing the\n     * total supply.\n     *\n     * Emits a {Transfer} event with `to` set to the zero address.\n     *\n     * Requirements:\n     *\n     * - `account` cannot be the zero address.\n     * - `account` must have at least `amount` tokens.\n     */\n    function _burn(address account, uint256 amount) internal virtual {\n        require(account != address(0), \"ERC20: burn from the zero address\");\n\n        _beforeTokenTransfer(account, address(0), amount);\n\n        uint256 accountBalance = _balances[account];\n        require(accountBalance >= amount, \"ERC20: burn amount exceeds balance\");\n        unchecked {\n            _balances[account] = accountBalance - amount;\n            // Overflow not possible: amount <= accountBalance <= totalSupply.\n            _totalSupply -= amount;\n        }\n\n        emit Transfer(account, address(0), amount);\n\n        _afterTokenTransfer(account, address(0), amount);\n    }\n\n    /**\n     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.\n     *\n     * This internal function is equivalent to `approve`, and can be used to\n     * e.g. set automatic allowances for certain subsystems, etc.\n     *\n     * Emits an {Approval} event.\n     *\n     * Requirements:\n     *\n     * - `owner` cannot be the zero address.\n     * - `spender` cannot be the zero address.\n     */\n    function _approve(\n        address owner,\n        address spender,\n        uint256 amount\n    ) internal virtual {\n        require(owner != address(0), \"ERC20: approve from the zero address\");\n        require(spender != address(0), \"ERC20: approve to the zero address\");\n\n        _allowances[owner][spender] = amount;\n        emit Approval(owner, spender, amount);\n    }\n\n    /**\n     * @dev Updates `owner` s allowance for `spender` based on spent `amount`.\n     *\n     * Does not update the allowance amount in case of infinite allowance.\n     * Revert if not enough allowance is available.\n     *\n     * Might emit an {Approval} event.\n     */\n    function _spendAllowance(\n        address owner,\n        address spender,\n        uint256 amount\n    ) internal virtual {\n        uint256 currentAllowance = allowance(owner, spender);\n        if (currentAllowance != type(uint256).max) {\n            require(currentAllowance >= amount, \"ERC20: insufficient allowance\");\n            unchecked {\n                _approve(owner, spender, currentAllowance - amount);\n            }\n        }\n    }\n\n    /**\n     * @dev Hook that is called before any transfer of tokens. This includes\n     * minting and burning.\n     *\n     * Calling conditions:\n     *\n     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens\n     * will be transferred to `to`.\n     * - when `from` is zero, `amount` tokens will be minted for `to`.\n     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.\n     * - `from` and `to` are never both zero.\n     *\n     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].\n     */\n    function _beforeTokenTransfer(\n        address from,\n        address to,\n        uint256 amount\n    ) internal virtual {}\n\n    /**\n     * @dev Hook that is called after any transfer of tokens. This includes\n     * minting and burning.\n     *\n     * Calling conditions:\n     *\n     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens\n     * has been transferred to `to`.\n     * - when `from` is zero, `amount` tokens have been minted for `to`.\n     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.\n     * - `from` and `to` are never both zero.\n     *\n     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].\n     */\n    function _afterTokenTransfer(\n        address from,\n        address to,\n        uint256 amount\n    ) internal virtual {}\n}\n"
      },
      "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)\n\npragma solidity ^0.8.0;\n\nimport \"../IERC20.sol\";\n\n/**\n * @dev Interface for the optional metadata functions from the ERC20 standard.\n *\n * _Available since v4.1._\n */\ninterface IERC20Metadata is IERC20 {\n    /**\n     * @dev Returns the name of the token.\n     */\n    function name() external view returns (string memory);\n\n    /**\n     * @dev Returns the symbol of the token.\n     */\n    function symbol() external view returns (string memory);\n\n    /**\n     * @dev Returns the decimals places of the token.\n     */\n    function decimals() external view returns (uint8);\n}\n"
      },
      "@openzeppelin/contracts/token/ERC20/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"
      },
      "@openzeppelin/contracts/utils/Context.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)\n\npragma solidity ^0.8.0;\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 Context {\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"
      },
      "@openzeppelin/contracts/utils/introspection/ERC165.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)\n\npragma solidity ^0.8.0;\n\nimport \"./IERC165.sol\";\n\n/**\n * @dev Implementation of the {IERC165} interface.\n *\n * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check\n * for the additional interface id that will be supported. For example:\n *\n * ```solidity\n * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {\n *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);\n * }\n * ```\n *\n * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.\n */\nabstract contract ERC165 is IERC165 {\n    /**\n     * @dev See {IERC165-supportsInterface}.\n     */\n    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {\n        return interfaceId == type(IERC165).interfaceId;\n    }\n}\n"
      },
      "@openzeppelin/contracts/utils/introspection/IERC165.sol": {
        "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)\n\npragma solidity ^0.8.0;\n\n/**\n * @dev Interface of the ERC165 standard, as defined in the\n * https://eips.ethereum.org/EIPS/eip-165[EIP].\n *\n * Implementers can declare support of contract interfaces, which can then be\n * queried by others ({ERC165Checker}).\n *\n * For an implementation, see {ERC165}.\n */\ninterface IERC165 {\n    /**\n     * @dev Returns true if this contract implements the interface defined by\n     * `interfaceId`. See the corresponding\n     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]\n     * to learn more about how these ids are created.\n     *\n     * This function call must use less than 30 000 gas.\n     */\n    function supportsInterface(bytes4 interfaceId) external view returns (bool);\n}\n"
      },
      "contracts/oftv2/GoldOFTV2.sol": {
        "content": "// SPDX-License-Identifier: MIT\n\npragma solidity ^0.8.0;\n\nimport \"@layerzerolabs/solidity-examples/contracts/token/oft/v2/OFTV2.sol\";\n\n// Welcome to GoldenBoys Club\n// Own it, make Yourself a GoldenBoy!\n// Its Time to Shine\n\n/// @title Gold OFTV2\ncontract GoldOFTV2 is OFTV2 {\n    constructor(string memory _name, string memory _symbol, uint8 _sharedDecimals, address _layerZeroEndpoint) OFTV2(_name, _symbol, _sharedDecimals, _layerZeroEndpoint) {}\n}\n"
      }
    },
    "settings": {
      "optimizer": {
        "enabled": true,
        "runs": 200
      },
      "outputSelection": {
        "*": {
          "*": [
            "evm.bytecode",
            "evm.deployedBytecode",
            "devdoc",
            "userdoc",
            "metadata",
            "abi"
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      },
      "metadata": {
        "useLiteralContent": true
      },
      "libraries": {}
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  }}