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Contract Source Code (Vyper language format)

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# @version 0.3.1
"""
@title Curve Optimism Bridge Wrapper
"""
from vyper.interfaces import ERC20


event UpdateTokenMapping:
    _l1_token: indexed(address)
    _old_l2_token: address
    _new_l2_token: address

event TransferOwnership:
    _old_owner: address
    _new_owner: address


CRV20: constant(address) = 0xD533a949740bb3306d119CC777fa900bA034cd52
L2_CRV20: constant(address) = 0x331B9182088e2A7d6D3Fe4742AbA1fB231aEcc56
OPTIMISM_L1_BRIDGE: constant(address) = 0x34C0bD5877A5Ee7099D0f5688D65F4bB9158BDE2


# l1_token -> l2_token
l2_token: public(HashMap[address, address])

owner: public(address)
future_owner: public(address)


@external
def __init__():
    assert ERC20(CRV20).approve(OPTIMISM_L1_BRIDGE, MAX_UINT256)
    self.l2_token[CRV20] = L2_CRV20

    self.owner = msg.sender
    log TransferOwnership(ZERO_ADDRESS, msg.sender)


@external
def bridge(_token: address, _to: address, _amount: uint256):
    """
    @notice Bridge a token to Optimism mainnet using the L1 Standard Bridge
    @param _token The token to bridge
    @param _to The address to deposit the token to on L2
    @param _amount The amount of the token to deposit
    """
    assert ERC20(_token).transferFrom(msg.sender, self, _amount)

    l2_token: address = L2_CRV20
    if _token != CRV20:
        l2_token = self.l2_token[_token]
        assert l2_token != ZERO_ADDRESS  # dev: token not mapped

    raw_call(
        OPTIMISM_L1_BRIDGE,
        _abi_encode(
            _token,
            l2_token,
            _to,
            _amount,
            convert(200_000, uint256),
            b"",
            method_id=method_id("depositERC20To(address,address,address,uint256,uint32,bytes)")
        )
    )


@view
@external
def check(_account: address) -> bool:
    """
    @notice Dummy method to check if caller is allowed to bridge
    @param _account The account to check
    """
    return True


@view
@external
def cost() -> uint256:
    """
    @notice Cost in ETH to bridge
    """
    return 0


@external
def set_l2_token(_l1_token: address, _l2_token: address):
    """
    @notice Set the mapping of L1 token -> L2 token for depositing
    @param _l1_token The l1 token address
    @param _l2_token The l2 token address
    """
    assert msg.sender == self.owner
    assert _l1_token != CRV20  # dev: cannot reset mapping for CRV20

    amount: uint256 = 0
    if _l2_token != ZERO_ADDRESS:
        amount = MAX_UINT256
    assert ERC20(_l1_token).approve(OPTIMISM_L1_BRIDGE, amount)

    log UpdateTokenMapping(_l1_token, self.l2_token[_l1_token], _l2_token)
    self.l2_token[_l1_token] = _l2_token


@external
def commit_transfer_ownership(_future_owner: address):
    """
    @notice Transfer ownership to `_future_owner`
    @param _future_owner The account to commit as the future owner
    """
    assert msg.sender == self.owner  # dev: only owner

    self.future_owner = _future_owner


@external
def accept_transfer_ownership():
    """
    @notice Accept the transfer of ownership
    @dev Only the committed future owner can call this function
    """
    assert msg.sender == self.future_owner  # dev: only future owner

    log TransferOwnership(self.owner, msg.sender)
    self.owner = msg.sender

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