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L2ERC20.sol
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L2ERC20.sol
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pragma solidity ^0.5.0;
import { IERC20 } from "./ERC20.interface.sol";
import { ERC20 } from "./ERC20.sol";
import { L1ERC20Deposit } from "./L1ERC20Deposit.sol";
import { iOVM_BaseCrossDomainMessenger } from "@eth-optimism/contracts/build/contracts/iOVM/bridge/iOVM_BaseCrossDomainMessenger.sol";
contract L2ERC20 is ERC20 {
address l1ERC20DepositAddress;
iOVM_BaseCrossDomainMessenger internal messenger;
constructor(
string memory _tokenName,
uint8 _decimalUnits,
string memory _tokenSymbol
) public ERC20(0, _tokenName, _decimalUnits, _tokenSymbol) {}
function init(
address _messenger,
address _L1ERC20DepositAddress
) public {
require(l1ERC20DepositAddress == address(0), "L2ERC20 instance has already been initalized");
messenger = iOVM_BaseCrossDomainMessenger(_messenger);
l1ERC20DepositAddress = _L1ERC20DepositAddress;
}
function mint(address _depositor, uint256 _amount) public returns (bool success) {
require(messenger.xDomainMessageSender() == l1ERC20DepositAddress);
require(msg.sender == address(messenger), "Only messages relayed by L2CrossDomainMessenger can mint");
_mint(_depositor, _amount);
return true;
}
function withdraw(uint256 _amount) public {
_burn(msg.sender, _amount);
// generate encoded calldata to be executed on L1
bytes memory message = abi.encodeWithSignature(
"withdraw(address,uint256)",
msg.sender,
_amount
);
// send the message over to the L1CrossDomainMessenger!
messenger.sendMessage(l1ERC20DepositAddress, message, 1000000);
}
}