1// SPDX-License-Identifier: MIT 2pragma solidity ^0.8.22; 3 4import { IOApp, ILayerZeroEndpointV2 } from "./interfaces/IOApp.sol"; 5import { OAppSender } from "./OAppSender.sol"; 6// @dev import the origin so its exposed to OApp implementers 7import { OAppReceiver, Origin } from "./OAppReceiver.sol"; 8 9abstract contract OApp is IOApp, OAppSender, OAppReceiver { 10    constructor(address _endpoint, address _owner) { 11        _transferOwnership(_owner); 12        endpoint = ILayerZeroEndpointV2(_endpoint); 13    } 14 15    function oAppVersion() public pure virtual returns (uint64 senderVersion, uint64 receiverVersion) { 16        senderVersion = SENDER_VERSION; 17        receiverVersion = RECEIVER_VERSION; 18    } 19} 20

A

OApp.sol

Provides developers with a generic message passing interface to ship and receive arbitrary pieces of recordsdata between contracts present on varied blockchain networks.

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1// SPDX-License-Identifier: MIT 2pragma solidity ^0.8.22; 3 4import { ERC20 } from "@openzeppelin/contracts/token/ERC20/ERC20.sol"; 5import { OFTCore } from "./OFTCore.sol"; 6 7contract OFT is OFTCore, ERC20 { 8    constructor( 9        string memory _name, 10        string memory _symbol, 11        address _lzEndpoint, 12        address _owner 13    ) ERC20(_name, _symbol) OFTCore(decimals(), _lzEndpoint, _owner) {} 14 15    // @dev major indicates they shared a compatible msg payload format and CAN communicate between one another 16    // @dev minor indicates a varying version, eg. OFTAdapter vs. OFT 17    function oftVersion() external pure returns (uint64 major, uint64 minor) { 18        return (1, 1); 19    } 20 21    function token() external view virtual returns (address) { 22        return address(this); 23    } 24 25    // @dev burn the tokens from the users specified balance 26    function _debitSender( 27        uint256 _amountToSendLD, 28        uint256 _minAmountToReceiveLD, 29        uint32 _dstEid 30    ) internal virtual override returns (uint256 amountDebitedLD, uint256 amountToCreditLD) { 31        (amountDebitedLD, amountToCreditLD) = _debitView(_amountToSendLD, _minAmountToReceiveLD, _dstEid); 32 33        _burn(msg.sender, amountDebitedLD); 34    } 35 36    // @dev burn the tokens that someone has sent into this contract in a push method 37    // @dev allows anyone to send tokens that have been sent to this contract 38    // @dev similar to how you can push tokens to the endpoint to pay the msg fee, vs the endpoint needing approval 39    function _debitThis( 40        uint256 _minAmountToReceiveLD, 41        uint32 _dstEid 42    ) internal virtual override returns (uint256 amountDebitedLD, uint256 amountToCreditLD) { 43        (amountDebitedLD, amountToCreditLD) = _debitView(balanceOf(address(this)), _minAmountToReceiveLD, _dstEid); 44 45        _burn(address(this), amountDebitedLD); 46    } 47 48    function _credit( 49        address _to, 50        uint256 _amountToCreditLD, 51        uint32 /*_srcEid*/ 52    ) internal virtual override returns (uint256 amountReceivedLD) { 53        _mint(_to, _amountToCreditLD); 54        return _amountToCreditLD; 55    } 56} 57

B

OFT.sol

OFTs enable fungible tokens to be transferred all the scheme in which by scheme of just a few blockchains with out asset wrapping, middlechains, or liquidity swimming pools.

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