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/**
 *Submitted for verification at Etherscan.io on 2020-01-10
*/

/// MkrAuthority -- custom authority for MKR token access control

// Copyright (C) 2019 Maker Ecosystem Growth Holdings, INC.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

pragma solidity ^0.5.12;

contract MkrAuthority {
  address public root;
  modifier sudo { require(msg.sender == root); _; }
  event LogSetRoot(address indexed newRoot);
  function setRoot(address usr) public sudo {
    root = usr;
    emit LogSetRoot(usr);
  }

  mapping (address => uint) public wards;
  event LogRely(address indexed usr);
  function rely(address usr) public sudo { wards[usr] = 1; emit LogRely(usr); }
  event LogDeny(address indexed usr);
  function deny(address usr) public sudo { wards[usr] = 0; emit LogDeny(usr); }

  constructor() public {
    root = msg.sender;
  }

  // bytes4(keccak256(abi.encodePacked('burn(uint256)')))
  bytes4 constant burn = bytes4(0x42966c68);
  // bytes4(keccak256(abi.encodePacked('burn(address,uint256)')))
  bytes4 constant burnFrom = bytes4(0x9dc29fac);
  // bytes4(keccak256(abi.encodePacked('mint(address,uint256)')))
  bytes4 constant mint = bytes4(0x40c10f19);

  function canCall(address src, address, bytes4 sig)
      public view returns (bool)
  {
    if (sig == burn || sig == burnFrom || src == root) {
      return true;
    } else if (sig == mint) {
      return (wards[src] == 1);
    } else {
      return false;
    }
  }
}

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[{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"usr","type":"address"}],"name":"LogDeny","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"usr","type":"address"}],"name":"LogRely","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"newRoot","type":"address"}],"name":"LogSetRoot","type":"event"},{"constant":true,"inputs":[{"internalType":"address","name":"src","type":"address"},{"internalType":"address","name":"","type":"address"},{"internalType":"bytes4","name":"sig","type":"bytes4"}],"name":"canCall","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"usr","type":"address"}],"name":"deny","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"usr","type":"address"}],"name":"rely","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"root","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"usr","type":"address"}],"name":"setRoot","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"wards","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"}]

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bzzr://61124948b0428630348ffa52dd3034f60a18071d8d0e96d44fbe674c8e8625a1