Contract Source Code (Vyper language format)

IDE

• Blockscan IDE
• 🤖 Code ReaderBeta

More Options

• Similar
• Submit Audit
• Compare

# @version 0.3.0
"""
@title amToken Burner
@notice Converts amToken lending coins to USDC and transfers to `ChildBurner`
"""

from vyper.interfaces import ERC20


interface LendingPool:
    def withdraw(_underlying_asset: address, _amount: uint256, _receiver: address): nonpayable

interface aToken:
    def UNDERLYING_ASSET_ADDRESS() -> address: view

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


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

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

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

ADDRESS_PROVIDER: constant(address) = 0x0000000022D53366457F9d5E68Ec105046FC4383
AAVE_LENDING_POOL: constant(address) = 0x8dFf5E27EA6b7AC08EbFdf9eB090F32ee9a30fcf
USDC: constant(address) = 0x2791Bca1f2de4661ED88A30C99A7a9449Aa84174


@external
def __init__(_receiver: address, _owner: address):
    """
    @notice Contract constructor
    @param _receiver Address that converted tokens are transferred to.
                     Should be set to the `ChildBurner` deployment.
    @param _owner Owner address. Can kill the contract and recover tokens.
    """
    self.receiver = _receiver
    self.owner = _owner


@external
def burn(_coin: address) -> bool:
    """
    @notice Unwrap `_coin` and transfer to the receiver
    @param _coin Address of the coin being unwrapped
    @return bool success
    """
    assert not self.is_killed  # dev: is killed

    # transfer coins from caller
    amount: uint256 = ERC20(_coin).balanceOf(msg.sender)
    ERC20(_coin).transferFrom(msg.sender, self, amount)

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

    # unwrap aTokens for underlying asset and transfer to receiver
    underlying: address = aToken(_coin).UNDERLYING_ASSET_ADDRESS()
    if underlying == USDC:
        LendingPool(AAVE_LENDING_POOL).withdraw(underlying, amount, self.receiver)
    else:
        registry_swap: address = AddressProvider(ADDRESS_PROVIDER).get_address(2)
        LendingPool(AAVE_LENDING_POOL).withdraw(underlying, amount, self)
        if not self.is_approved[registry_swap][underlying]:
            response: Bytes[32] = raw_call(
                underlying,
                _abi_encode(registry_swap, MAX_UINT256, method_id=method_id("approve(address,uint256)")),
                max_outsize=32,
            )
            if len(response) != 0:
                assert convert(response, bool)
            self.is_approved[registry_swap][underlying] = True

        # get actual balance in case of transfer fee or pre-existing balance
        amount = ERC20(underlying).balanceOf(self)
        RegistrySwap(registry_swap).exchange_with_best_rate(underlying, USDC, amount, 0, self.receiver)

    return True


@external
def recover_balance(_coin: address) -> bool:
    """
    @notice Recover ERC20 tokens from this contract
    @param _coin Token address
    @return bool success
    """
    assert msg.sender == self.owner  # dev: only owner

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

    return True


@external
def set_receiver(_receiver: address):
    assert msg.sender == self.owner
    self.receiver = _receiver


@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 == self.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

• No Contract Security Audit Submitted- Submit Audit Here

[{"stateMutability":"nonpayable","type":"constructor","inputs":[{"name":"_receiver","type":"address"},{"name":"_owner","type":"address"}],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"burn","inputs":[{"name":"_coin","type":"address"}],"outputs":[{"name":"","type":"bool"}],"gas":72069},{"stateMutability":"nonpayable","type":"function","name":"recover_balance","inputs":[{"name":"_coin","type":"address"}],"outputs":[{"name":"","type":"bool"}],"gas":12531},{"stateMutability":"nonpayable","type":"function","name":"set_receiver","inputs":[{"name":"_receiver","type":"address"}],"outputs":[],"gas":37702},{"stateMutability":"nonpayable","type":"function","name":"set_killed","inputs":[{"name":"_is_killed","type":"bool"}],"outputs":[{"name":"","type":"bool"}],"gas":37875},{"stateMutability":"nonpayable","type":"function","name":"commit_transfer_ownership","inputs":[{"name":"_future_owner","type":"address"}],"outputs":[{"name":"","type":"bool"}],"gas":37905},{"stateMutability":"nonpayable","type":"function","name":"accept_transfer_ownership","inputs":[],"outputs":[{"name":"","type":"bool"}],"gas":37774},{"stateMutability":"view","type":"function","name":"receiver","inputs":[],"outputs":[{"name":"","type":"address"}],"gas":2706},{"stateMutability":"view","type":"function","name":"is_killed","inputs":[],"outputs":[{"name":"","type":"bool"}],"gas":2736},{"stateMutability":"view","type":"function","name":"owner","inputs":[],"outputs":[{"name":"","type":"address"}],"gas":2766},{"stateMutability":"view","type":"function","name":"future_owner","inputs":[],"outputs":[{"name":"","type":"address"}],"gas":2796}]

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

000000000000000000000000d6930b7f661257da36f93160149b0317352375940000000000000000000000007eeac6cddbd1d0b8af061742d41877d7f707289a

-----Decoded View---------------
Arg [0] : _receiver (address): 0xd6930b7f661257DA36F93160149b031735237594
Arg [1] : _owner (address): 0x7EeAC6CDdbd1D0B8aF061742D41877D7F707289a

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000d6930b7f661257da36f93160149b031735237594
Arg [1] : 0000000000000000000000007eeac6cddbd1d0b8af061742d41877d7f707289a