layerZeroBridge/contracts/receiver.sol

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.0;

contract receiver {
  address public endpoint;
  mapping(uint16 => bytes) public trustedRemoteLookup;
  address public owner;

  event done(address from);

  constructor(address _endpoint) {
    owner = msg.sender;
    endpoint = _endpoint;
  }

  modifier onlyOwner() {
    require(owner == msg.sender, "not owner");
    _;
  }

  function setEndpoint(address _endpoint) external onlyOwner {
    endpoint = _endpoint;
  }

  function setTrustRemoteLookup(uint16 _chainId, bytes memory _address) external onlyOwner {
    trustedRemoteLookup[_chainId] = _address;

  }

  function lzReceive(
    uint16 _srcChainId,
    bytes memory _srcAddress,
    uint64 _nonce,
    bytes memory _payload
  ) external payable{
    require(msg.sender == address(endpoint));
    require(keccak256(_srcAddress) == keccak256(trustedRemoteLookup[_srcChainId]));
    address fromAddress;
    assembly {
      fromAddress := mload(add(_srcAddress, 20))
    }

    emit done(fromAddress);
  }
}