Add recoverability for Dai mistakenly sent into the contract

[0age]

Dai (ERC20) that is sent into the contract becomes orphaned. Since all enlisted Dai is immediately locked in the vat, an owner should be able to safely retrieve the Dai and return it to the sender.

[naszam]

I would recommend for the future to implement a fall back function as follow:

function deposit() payable external { balances[msg.sender] += msg.value; }

as recommended by ConsenSys.

Or using the selfdestruct() function at the end of the debt auctions, to collect the balance and send back the Dai to their owners or better, extend the withdraw function to address this issue (anyway, checking the code, I saw that something is already implemented and I'm wondering why people can't get back their DAI? should be possible I guess)

[naszam]

Check here for new ways to mitigate funds accidentally sent to smart contracts, using Solidity 0.6.x receive(): link