mirror of
https://github.com/Instadapp/smart-contract.git
synced 2024-07-29 22:08:07 +00:00
112 lines
2.8 KiB
Solidity
112 lines
2.8 KiB
Solidity
pragma solidity ^0.5.0;
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interface TubInterface {
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function join(uint) external;
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function exit(uint) external;
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function free(bytes32, uint) external;
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function give(bytes32, address) external;
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function gem() external view returns (TokenInterface);
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function skr() external view returns (TokenInterface);
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function ink(bytes32) external view returns (uint);
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function per() external view returns (uint);
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}
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interface TokenInterface {
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function allowance(address, address) external view returns (uint);
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function balanceOf(address) external view returns (uint);
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function approve(address, uint) external;
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function withdraw(uint) external;
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}
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contract DSMath {
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function add(uint x, uint y) internal pure returns (uint z) {
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require((z = x + y) >= x, "math-not-safe");
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}
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function mul(uint x, uint y) internal pure returns (uint z) {
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require(y == 0 || (z = x * y) / y == x, "math-not-safe");
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}
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uint constant RAY = 10 ** 27;
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function rmul(uint x, uint y) internal pure returns (uint z) {
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z = add(mul(x, y), RAY / 2) / RAY;
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}
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function rdiv(uint x, uint y) internal pure returns (uint z) {
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z = add(mul(x, RAY), y / 2) / y;
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}
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}
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contract Helpers is DSMath {
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/**
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* @dev get MakerDAO CDP engine
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*/
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function getSaiTubAddress() public pure returns (address sai) {
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sai = 0x448a5065aeBB8E423F0896E6c5D525C040f59af3;
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}
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}
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contract CDPResolver is Helpers {
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/**
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* @dev transfer CDP ownership
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*/
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function give(uint cdpNum, address nextOwner) public {
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TubInterface(getSaiTubAddress()).give(bytes32(cdpNum), nextOwner);
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}
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function free(uint cdpNum, uint jam) public {
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bytes32 cup = bytes32(cdpNum);
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address tubAddr = getSaiTubAddress();
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if (jam > 0) {
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TubInterface tub = TubInterface(tubAddr);
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TokenInterface peth = tub.skr();
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uint ink = rdiv(jam, tub.per());
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ink = rmul(ink, tub.per()) <= jam ? ink : ink - 1;
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tub.free(cup, ink);
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setAllowance(peth, tubAddr);
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tub.exit(ink);
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uint freeJam = tub.gem().balanceOf(address(this)); // withdraw possible previous stuck WETH as well
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tub.gem().withdraw(freeJam);
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address(msg.sender).transfer(freeJam);
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}
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}
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function setAllowance(TokenInterface token_, address spender_) private {
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if (token_.allowance(address(this), spender_) != uint(-1)) {
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token_.approve(spender_, uint(-1));
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}
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}
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}
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contract InstaMaker is CDPResolver {
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uint public version;
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/**
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* @dev setting up variables on deployment
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* 1...2...3 versioning in each subsequent deployments
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*/
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constructor(uint _version) public {
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version = _version;
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}
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} |