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// SPDX-License-Identifier: MIT
pragma solidity 0.8.15;
import { Predeploys } from "../libraries/Predeploys.sol";
import { StandardBridge } from "../universal/StandardBridge.sol";
import { Semver } from "../universal/Semver.sol";
/**
* @custom:proxied
* @title L1StandardBridge
* @notice The L1StandardBridge is responsible for transfering ETH and ERC20 tokens between L1 and
* L2. In the case that an ERC20 token is native to L1, it will be escrowed within this
* contract. If the ERC20 token is native to L2, it will be burnt. Before Bedrock, ETH was
* stored within this contract. After Bedrock, ETH is instead stored inside the
* OptimismPortal contract.
* NOTE: this contract is not intended to support all variations of ERC20 tokens. Examples
* of some token types that may not be properly supported by this contract include, but are
* not limited to: tokens with transfer fees, rebasing tokens, and tokens with blocklists.
*/
contract L1StandardBridge is StandardBridge, Semver {
/**
* @custom:legacy
* @notice Emitted whenever a deposit of ETH from L1 into L2 is initiated.
*
* @param from Address of the depositor.
* @param to Address of the recipient on L2.
* @param amount Amount of ETH deposited.
* @param extraData Extra data attached to the deposit.
*/
event ETHDepositInitiated(
address indexed from,
address indexed to,
uint256 amount,
bytes extraData
);
/**
* @custom:legacy
* @notice Emitted whenever a withdrawal of ETH from L2 to L1 is finalized.
*
* @param from Address of the withdrawer.
* @param to Address of the recipient on L1.
* @param amount Amount of ETH withdrawn.
* @param extraData Extra data attached to the withdrawal.
*/
event ETHWithdrawalFinalized(
address indexed from,
address indexed to,
uint256 amount,
bytes extraData
);
/**
* @custom:legacy
* @notice Emitted whenever an ERC20 deposit is initiated.
*
* @param l1Token Address of the token on L1.
* @param l2Token Address of the corresponding token on L2.
* @param from Address of the depositor.
* @param to Address of the recipient on L2.
* @param amount Amount of the ERC20 deposited.
* @param extraData Extra data attached to the deposit.
*/
event ERC20DepositInitiated(
address indexed l1Token,
address indexed l2Token,
address indexed from,
address to,
uint256 amount,
bytes extraData
);
/**
* @custom:legacy
* @notice Emitted whenever an ERC20 withdrawal is finalized.
*
* @param l1Token Address of the token on L1.
* @param l2Token Address of the corresponding token on L2.
* @param from Address of the withdrawer.
* @param to Address of the recipient on L1.
* @param amount Amount of the ERC20 withdrawn.
* @param extraData Extra data attached to the withdrawal.
*/
event ERC20WithdrawalFinalized(
address indexed l1Token,
address indexed l2Token,
address indexed from,
address to,
uint256 amount,
bytes extraData
);
/**
* @custom:semver 1.1.0
*
* @param _messenger Address of the L1CrossDomainMessenger.
*/
constructor(address payable _messenger)
Semver(1, 1, 0)
StandardBridge(_messenger, payable(Predeploys.L2_STANDARD_BRIDGE))
{}
/**
* @notice Allows EOAs to bridge ETH by sending directly to the bridge.
*/
receive() external payable override onlyEOA {
_initiateETHDeposit(msg.sender, msg.sender, RECEIVE_DEFAULT_GAS_LIMIT, bytes(""));
}
/**
* @custom:legacy
* @notice Deposits some amount of ETH into the sender's account on L2.
*
* @param _minGasLimit Minimum gas limit for the deposit message on L2.
* @param _extraData Optional data to forward to L2. Data supplied here will not be used to
* execute any code on L2 and is only emitted as extra data for the
* convenience of off-chain tooling.
*/
function depositETH(uint32 _minGasLimit, bytes calldata _extraData) external payable onlyEOA {
_initiateETHDeposit(msg.sender, msg.sender, _minGasLimit, _extraData);
}
/**
* @custom:legacy
* @notice Deposits some amount of ETH into a target account on L2.
* Note that if ETH is sent to a contract on L2 and the call fails, then that ETH will
* be locked in the L2StandardBridge. ETH may be recoverable if the call can be
* successfully replayed by increasing the amount of gas supplied to the call. If the
* call will fail for any amount of gas, then the ETH will be locked permanently.
*
* @param _to Address of the recipient on L2.
* @param _minGasLimit Minimum gas limit for the deposit message on L2.
* @param _extraData Optional data to forward to L2. Data supplied here will not be used to
* execute any code on L2 and is only emitted as extra data for the
* convenience of off-chain tooling.
*/
function depositETHTo(
address _to,
uint32 _minGasLimit,
bytes calldata _extraData
) external payable {
_initiateETHDeposit(msg.sender, _to, _minGasLimit, _extraData);
}
/**
* @custom:legacy
* @notice Deposits some amount of ERC20 tokens into the sender's account on L2.
*
* @param _l1Token Address of the L1 token being deposited.
* @param _l2Token Address of the corresponding token on L2.
* @param _amount Amount of the ERC20 to deposit.
* @param _minGasLimit Minimum gas limit for the deposit message on L2.
* @param _extraData Optional data to forward to L2. Data supplied here will not be used to
* execute any code on L2 and is only emitted as extra data for the
* convenience of off-chain tooling.
*/
function depositERC20(
address _l1Token,
address _l2Token,
uint256 _amount,
uint32 _minGasLimit,
bytes calldata _extraData
) external virtual onlyEOA {
_initiateERC20Deposit(
_l1Token,
_l2Token,
msg.sender,
msg.sender,
_amount,
_minGasLimit,
_extraData
);
}
/**
* @custom:legacy
* @notice Deposits some amount of ERC20 tokens into a target account on L2.
*
* @param _l1Token Address of the L1 token being deposited.
* @param _l2Token Address of the corresponding token on L2.
* @param _to Address of the recipient on L2.
* @param _amount Amount of the ERC20 to deposit.
* @param _minGasLimit Minimum gas limit for the deposit message on L2.
* @param _extraData Optional data to forward to L2. Data supplied here will not be used to
* execute any code on L2 and is only emitted as extra data for the
* convenience of off-chain tooling.
*/
function depositERC20To(
address _l1Token,
address _l2Token,
address _to,
uint256 _amount,
uint32 _minGasLimit,
bytes calldata _extraData
) external virtual {
_initiateERC20Deposit(
_l1Token,
_l2Token,
msg.sender,
_to,
_amount,
_minGasLimit,
_extraData
);
}
/**
* @custom:legacy
* @notice Finalizes a withdrawal of ETH from L2.
*
* @param _from Address of the withdrawer on L2.
* @param _to Address of the recipient on L1.
* @param _amount Amount of ETH to withdraw.
* @param _extraData Optional data forwarded from L2.
*/
function finalizeETHWithdrawal(
address _from,
address _to,
uint256 _amount,
bytes calldata _extraData
) external payable {
finalizeBridgeETH(_from, _to, _amount, _extraData);
}
/**
* @custom:legacy
* @notice Finalizes a withdrawal of ERC20 tokens from L2.
*
* @param _l1Token Address of the token on L1.
* @param _l2Token Address of the corresponding token on L2.
* @param _from Address of the withdrawer on L2.
* @param _to Address of the recipient on L1.
* @param _amount Amount of the ERC20 to withdraw.
* @param _extraData Optional data forwarded from L2.
*/
function finalizeERC20Withdrawal(
address _l1Token,
address _l2Token,
address _from,
address _to,
uint256 _amount,
bytes calldata _extraData
) external {
finalizeBridgeERC20(_l1Token, _l2Token, _from, _to, _amount, _extraData);
}
/**
* @custom:legacy
* @notice Retrieves the access of the corresponding L2 bridge contract.
*
* @return Address of the corresponding L2 bridge contract.
*/
function l2TokenBridge() external view returns (address) {
return address(OTHER_BRIDGE);
}
/**
* @notice Internal function for initiating an ETH deposit.
*
* @param _from Address of the sender on L1.
* @param _to Address of the recipient on L2.
* @param _minGasLimit Minimum gas limit for the deposit message on L2.
* @param _extraData Optional data to forward to L2.
*/
function _initiateETHDeposit(
address _from,
address _to,
uint32 _minGasLimit,
bytes memory _extraData
) internal {
_initiateBridgeETH(_from, _to, msg.value, _minGasLimit, _extraData);
}
/**
* @notice Internal function for initiating an ERC20 deposit.
*
* @param _l1Token Address of the L1 token being deposited.
* @param _l2Token Address of the corresponding token on L2.
* @param _from Address of the sender on L1.
* @param _to Address of the recipient on L2.
* @param _amount Amount of the ERC20 to deposit.
* @param _minGasLimit Minimum gas limit for the deposit message on L2.
* @param _extraData Optional data to forward to L2.
*/
function _initiateERC20Deposit(
address _l1Token,
address _l2Token,
address _from,
address _to,
uint256 _amount,
uint32 _minGasLimit,
bytes memory _extraData
) internal {
_initiateBridgeERC20(_l1Token, _l2Token, _from, _to, _amount, _minGasLimit, _extraData);
}
/**
* @notice Emits the legacy ETHDepositInitiated event followed by the ETHBridgeInitiated event.
* This is necessary for backwards compatibility with the legacy bridge.
*
* @inheritdoc StandardBridge
*/
function _emitETHBridgeInitiated(
address _from,
address _to,
uint256 _amount,
bytes memory _extraData
) internal override {
emit ETHDepositInitiated(_from, _to, _amount, _extraData);
super._emitETHBridgeInitiated(_from, _to, _amount, _extraData);
}
/**
* @notice Emits the legacy ETHWithdrawalFinalized event followed by the ETHBridgeFinalized
* event. This is necessary for backwards compatibility with the legacy bridge.
*
* @inheritdoc StandardBridge
*/
function _emitETHBridgeFinalized(
address _from,
address _to,
uint256 _amount,
bytes memory _extraData
) internal override {
emit ETHWithdrawalFinalized(_from, _to, _amount, _extraData);
super._emitETHBridgeFinalized(_from, _to, _amount, _extraData);
}
/**
* @notice Emits the legacy ERC20DepositInitiated event followed by the ERC20BridgeInitiated
* event. This is necessary for backwards compatibility with the legacy bridge.
*
* @inheritdoc StandardBridge
*/
function _emitERC20BridgeInitiated(
address _localToken,
address _remoteToken,
address _from,
address _to,
uint256 _amount,
bytes memory _extraData
) internal override {
emit ERC20DepositInitiated(_localToken, _remoteToken, _from, _to, _amount, _extraData);
super._emitERC20BridgeInitiated(_localToken, _remoteToken, _from, _to, _amount, _extraData);
}
/**
* @notice Emits the legacy ERC20WithdrawalFinalized event followed by the ERC20BridgeFinalized
* event. This is necessary for backwards compatibility with the legacy bridge.
*
* @inheritdoc StandardBridge
*/
function _emitERC20BridgeFinalized(
address _localToken,
address _remoteToken,
address _from,
address _to,
uint256 _amount,
bytes memory _extraData
) internal override {
emit ERC20WithdrawalFinalized(_localToken, _remoteToken, _from, _to, _amount, _extraData);
super._emitERC20BridgeFinalized(_localToken, _remoteToken, _from, _to, _amount, _extraData);
}
}