Contract

Contract Source Code (Vyper language format)

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# @version 0.2.7
"""
@title Meta Burner
@notice Converts Metapool-paired coins to 3CRV and transfers to fee distributor
"""

from vyper.interfaces import ERC20


interface RegistrySwap:
    def exchange_with_best_rate(
        _from: address,
        _to: address,
        _amount: uint256,
        _expected: uint256,
        _receiver: address,
    ) -> uint256: payable

interface AddressProvider:
    def get_address(_id: uint256) -> address: view


ADDRESS_PROVIDER: constant(address) = 0x0000000022D53366457F9d5E68Ec105046FC4383
TRIPOOL_LP: constant(address) = 0x6c3F90f043a72FA612cbac8115EE7e52BDe6E490


is_approved: HashMap[address, HashMap[address, bool]]

receiver: public(address)
recovery: public(address)
is_killed: public(bool)

owner: public(address)
emergency_owner: public(address)
future_owner: public(address)
future_emergency_owner: public(address)


@external
def __init__(_receiver: address, _recovery: address, _owner: address, _emergency_owner: address):
    """
    @notice Contract constructor
    @param _receiver Address that converted tokens are transferred to.
                     Should be set to an `UnderlyingBurner` deployment.
    @param _recovery Address that tokens are transferred to during an
                     emergency token recovery.
    @param _owner Owner address. Can kill the contract, recover tokens
                  and modify the recovery address.
    @param _emergency_owner Emergency owner address. Can kill the contract
                            and recover tokens.
    """
    self.receiver = _receiver
    self.recovery = _recovery
    self.owner = _owner
    self.emergency_owner = _emergency_owner


@payable
@external
def burn(_coin: address) -> bool:
    """
    @notice Swap `_coin` for 3CRV and transfer to the fee distributor
    @param _coin Address of the coin being swapped
    @return bool success
    """
    assert not self.is_killed  # dev: is killed

    # transfer coins from caller
    amount: uint256 = ERC20(_coin).balanceOf(msg.sender)
    if amount != 0:
        response: Bytes[32] = raw_call(
            _coin,
            concat(
                method_id("transferFrom(address,address,uint256)"),
                convert(msg.sender, bytes32),
                convert(self, bytes32),
                convert(amount, bytes32),
            ),
            max_outsize=32,
        )
        if len(response) != 0:
            assert convert(response, bool)

    # get actual balance in case of transfer fee or pre-existing balance
    amount = ERC20(_coin).balanceOf(self)

    # swap coin for 3CRV and transfer to fee distributor
    registry_swap: address = AddressProvider(ADDRESS_PROVIDER).get_address(2)
    if not self.is_approved[registry_swap][_coin]:
        response: Bytes[32] = raw_call(
            _coin,
            concat(
                method_id("approve(address,uint256)"),
                convert(registry_swap, bytes32),
                convert(MAX_UINT256, bytes32),
            ),
            max_outsize=32,
        )
        if len(response) != 0:
            assert convert(response, bool)
        self.is_approved[registry_swap][_coin] = True

    if amount != 0:
        RegistrySwap(registry_swap).exchange_with_best_rate(_coin, TRIPOOL_LP, amount, 0, self.receiver)

    return True


@external
def recover_balance(_coin: address) -> bool:
    """
    @notice Recover ERC20 tokens from this contract
    @dev Tokens are sent to the recovery address
    @param _coin Token address
    @return bool success
    """
    assert msg.sender in [self.owner, self.emergency_owner]  # dev: only owner

    amount: uint256 = ERC20(_coin).balanceOf(self)
    response: Bytes[32] = raw_call(
        _coin,
        concat(
            method_id("transfer(address,uint256)"),
            convert(self.recovery, bytes32),
            convert(amount, bytes32),
        ),
        max_outsize=32,
    )
    if len(response) != 0:
        assert convert(response, bool)

    return True


@external
def set_recovery(_recovery: address) -> bool:
    """
    @notice Set the token recovery address
    @param _recovery Token recovery address
    @return bool success
    """
    assert msg.sender == self.owner  # dev: only owner
    self.recovery = _recovery

    return True


@external
def set_killed(_is_killed: bool) -> bool:
    """
    @notice Set killed status for this contract
    @dev When killed, the `burn` function cannot be called
    @param _is_killed Killed status
    @return bool success
    """
    assert msg.sender in [self.owner, self.emergency_owner]  # dev: only owner
    self.is_killed = _is_killed

    return True



@external
def commit_transfer_ownership(_future_owner: address) -> bool:
    """
    @notice Commit a transfer of ownership
    @dev Must be accepted by the new owner via `accept_transfer_ownership`
    @param _future_owner New owner address
    @return bool success
    """
    assert msg.sender == self.owner  # dev: only owner
    self.future_owner = _future_owner

    return True


@external
def accept_transfer_ownership() -> bool:
    """
    @notice Accept a transfer of ownership
    @return bool success
    """
    assert msg.sender == self.future_owner  # dev: only owner
    self.owner = msg.sender

    return True


@external
def commit_transfer_emergency_ownership(_future_owner: address) -> bool:
    """
    @notice Commit a transfer of ownership
    @dev Must be accepted by the new owner via `accept_transfer_ownership`
    @param _future_owner New owner address
    @return bool success
    """
    assert msg.sender == self.emergency_owner  # dev: only owner
    self.future_emergency_owner = _future_owner

    return True


@external
def accept_transfer_emergency_ownership() -> bool:
    """
    @notice Accept a transfer of ownership
    @return bool success
    """
    assert msg.sender == self.future_emergency_owner  # dev: only owner
    self.emergency_owner = msg.sender

    return True

• No Contract Security Audit Submitted- Submit Audit Here

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000000000000000000000000a464e6dcda8ac41e03616f95f4bc98a13b8922dc000000000000000000000000ae9c8320a6394120ecb7b2b2678d9b4ac848d10600000000000000000000000040907540d8a6c65c637785e8f8b742ae6b0b996800000000000000000000000000669df67e4827fcc0e48a1838a8d5ab79281909

-----Decoded View---------------
Arg [0] : _receiver (address): 0xA464e6DCda8AC41e03616F95f4BC98a13b8922Dc
Arg [1] : _recovery (address): 0xAe9c8320A6394120ECb7B2B2678d9b4aC848d106
Arg [2] : _owner (address): 0x40907540d8a6C65c637785e8f8B742ae6b0b9968
Arg [3] : _emergency_owner (address): 0x00669DF67E4827FCc0E48A1838a8d5AB79281909

-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 000000000000000000000000a464e6dcda8ac41e03616f95f4bc98a13b8922dc
Arg [1] : 000000000000000000000000ae9c8320a6394120ecb7b2b2678d9b4ac848d106
Arg [2] : 00000000000000000000000040907540d8a6c65c637785e8f8b742ae6b0b9968
Arg [3] : 00000000000000000000000000669df67e4827fcc0e48a1838a8d5ab79281909