pragma solidity ^0.4.23;
import "../../common/interfaces/IAuthority.sol";
import "openzeppelin-solidity/contracts/ownership/Ownable.sol";

contract SmartTokenAuthority is Ownable, IAuthority {
    mapping (address => bool) public whiteList;

    function setWhitelist(address _address, bool _flag) public onlyOwner {
        whiteList[_address] = _flag;
    }

    function canCall(
        address _src, address _dst, bytes4 _sig
    ) public view returns (bool) {
        return ( whiteList[_src] && _sig == bytes4(keccak256("issue(address,uint256)"))) ||
        ( whiteList[_src] && _sig == bytes4(keccak256("mint(address,uint256)"))) ||
        ( whiteList[_src] && _sig == bytes4(keccak256("burn(address,uint256)")));
    }
}