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pragma solidity ^0.6.12;
interface GemLike { function decimals() external view returns (uint256); function transfer(address, uint256) external returns (bool); function transferFrom(address, address, uint256) external returns (bool); }
interface DSTokenLike { function mint(address, uint256) external; function burn(address, uint256) external; }
interface VatLike { function slip(bytes32, address, int256) external; function move(address, address, uint256) external; }
contract GemJoin { mapping(address => uint256) public wards;
function rely(address usr) external auth { wards[usr] = 1; emit Rely(usr); }
function deny(address usr) external auth { wards[usr] = 0; emit Deny(usr); }
modifier auth() { require(wards[msg.sender] == 1, "GemJoin/not-authorized"); _; }
VatLike public vat; bytes32 public ilk; GemLike public gem; uint256 public dec; uint256 public live;
event Rely(address indexed usr); event Deny(address indexed usr); event Join(address indexed usr, uint256 wad); event Exit(address indexed usr, uint256 wad); event Cage();
constructor(address vat_, bytes32 ilk_, address gem_) public { wards[msg.sender] = 1; live = 1; vat = VatLike(vat_); ilk = ilk_; gem = GemLike(gem_); dec = gem.decimals(); emit Rely(msg.sender); }
function cage() external auth { live = 0; emit Cage(); }
function join(address usr, uint256 wad) external { require(live == 1, "GemJoin/not-live"); require(int256(wad) >= 0, "GemJoin/overflow"); vat.slip(ilk, usr, int256(wad)); require(gem.transferFrom(msg.sender, address(this), wad), "GemJoin/failed-transfer"); emit Join(usr, wad); }
function exit(address usr, uint256 wad) external { require(wad <= 2 ** 255, "GemJoin/overflow"); vat.slip(ilk, msg.sender, -int256(wad)); require(gem.transfer(usr, wad), "GemJoin/failed-transfer"); emit Exit(usr, wad); } }
contract DaiJoin { mapping(address => uint256) public wards;
function rely(address usr) external auth { wards[usr] = 1; emit Rely(usr); }
function deny(address usr) external auth { wards[usr] = 0; emit Deny(usr); }
modifier auth() { require(wards[msg.sender] == 1, "DaiJoin/not-authorized"); _; }
VatLike public vat; DSTokenLike public dai; uint256 public live;
event Rely(address indexed usr); event Deny(address indexed usr); event Join(address indexed usr, uint256 wad); event Exit(address indexed usr, uint256 wad); event Cage();
constructor(address vat_, address dai_) public { wards[msg.sender] = 1; live = 1; vat = VatLike(vat_); dai = DSTokenLike(dai_); }
function cage() external auth { live = 0; emit Cage(); }
uint256 constant ONE = 10 ** 27;
function mul(uint256 x, uint256 y) internal pure returns (uint256 z) { require(y == 0 || (z = x * y) / y == x); }
function join(address usr, uint256 wad) external { vat.move(address(this), usr, mul(ONE, wad)); dai.burn(msg.sender, wad); emit Join(usr, wad); }
function exit(address usr, uint256 wad) external { require(live == 1, "DaiJoin/not-live"); vat.move(msg.sender, address(this), mul(ONE, wad)); dai.mint(usr, wad); emit Exit(usr, wad); } }
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