Permissionless Interoperability

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

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