Contract Source Code (Vyper language format)

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# @version 0.3.0
"""
@title Swap Burner
@notice Swaps an asset into another asset using a specific pool, and forwards to another burner
"""

from vyper.interfaces import ERC20

interface StableSwap:
    def exchange(i: int128, j: int128, dx: uint256, min_dy: uint256): nonpayable

interface CryptoPool:
    def exchange(i: uint256, j: uint256, dx: uint256, min_dy: uint256): payable
    def get_dy(i: uint256, j: uint256, amount: uint256) -> uint256: view

interface CryptoPoolETH:
    def exchange(i: uint256, j: uint256, dx: uint256, min_dy: uint256, use_eth: bool): payable


struct SwapData:
    pool: address
    coin: address
    receiver: address
    i: uint256
    j: uint256
    is_cryptoswap: bool


ETH_ADDRESS: constant(address) = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE

is_approved: HashMap[address, HashMap[address, bool]]
swap_data: public(HashMap[address, SwapData])
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__(_recovery: address, _owner: address, _emergency_owner: address):
    """
    @notice Contract constructor
    @dev Unlike other burners, this contract may transfer tokens to
         multiple addresses after the swap. Receiver addresses are
         set by calling `set_swap_data` instead of setting it
         within the constructor.
    @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.recovery = _recovery
    self.owner = _owner
    self.emergency_owner = _emergency_owner


@payable
@external
def __default__():
    # required to receive ether during intermediate swaps
    pass


@payable
@external
def burn(_coin: address) -> bool:
    """
    @notice Convert `_coin` by removing liquidity and transfer to another burner
    @param _coin Address of the coin being converted
    @return bool success
    """
    assert not self.is_killed  # dev: is killed

    amount: uint256 = 0
    eth_amount: uint256 = 0

    if _coin == ETH_ADDRESS:
        amount = self.balance
        eth_amount = self.balance
    else:
        # transfer coins from caller
        amount = ERC20(_coin).balanceOf(msg.sender)
        if amount != 0:
            response: Bytes[32] = raw_call(
                _coin,
                _abi_encode(
                    msg.sender,
                    self,
                    amount,
                    method_id=method_id("transferFrom(address,address,uint256)")
                ),
                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)

    if amount != 0:
        swap_data: SwapData = self.swap_data[_coin]
        if not swap_data.is_cryptoswap:
            StableSwap(swap_data.pool).exchange(convert(swap_data.i, int128), convert(swap_data.j, int128), amount, 0)
        elif _coin == ETH_ADDRESS or swap_data.coin == ETH_ADDRESS:
            CryptoPoolETH(swap_data.pool).exchange(swap_data.i, swap_data.j, amount, 0, True, value=eth_amount)
        else:
            CryptoPool(swap_data.pool).exchange(swap_data.i, swap_data.j, amount, 0)

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

    return True


@external
def set_swap_data(
    _from: address,
    _to: address,
    _pool: address,
    _receiver: address,
    i: uint256,
    j: uint256,
    _is_cryptoswap: bool
) -> bool:
    """
    @notice Set conversion and transfer data for `_from`
    @return bool success
    """
    assert msg.sender in [self.owner, self.emergency_owner]  # dev: only owner

    self.swap_data[_from] = SwapData({
        pool: _pool,
        coin: _to,
        receiver: _receiver,
        i: i,
        j: j,
        is_cryptoswap: _is_cryptoswap
    })

    if _from != ETH_ADDRESS:
        response: Bytes[32] = raw_call(
            _from,
            _abi_encode(_pool, MAX_UINT256, method_id=method_id("approve(address,uint256)")),
            max_outsize=32,
        )
        if len(response) != 0:
            assert convert(response, bool)

    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,
        _abi_encode(self.recovery, amount, method_id=method_id("transfer(address,uint256)")),
        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

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000000000000000000000000bf7e49483881c76487b0989cd7d9a8239b20ca4100000000000000000000000071f718d3e4d1449d1502a6a7595eb84ebccb1683000000000000000000000000babe61887f1de2713c6f97e567623453d3c79f67

-----Decoded View---------------
Arg [0] : _recovery (address): 0xbF7E49483881C76487b0989CD7d9A8239B20CA41
Arg [1] : _owner (address): 0x71F718D3e4d1449D1502A6A7595eb84eBcCB1683
Arg [2] : _emergency_owner (address): 0xbabe61887f1de2713c6f97e567623453d3C79f67

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 000000000000000000000000bf7e49483881c76487b0989cd7d9a8239b20ca41
Arg [1] : 00000000000000000000000071f718d3e4d1449d1502a6a7595eb84ebccb1683
Arg [2] : 000000000000000000000000babe61887f1de2713c6f97e567623453d3c79f67