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Transaction Hash
Method
Block
From
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Deny112445192020-11-12 18:50:221933 days ago1605207022IN
Sky: MCD Join GUSD A
0 ETH0.0008014947
Rely112445062020-11-12 18:48:461933 days ago1605206926IN
Sky: MCD Join GUSD A
0 ETH0.0022119647

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Contract Source Code Verified (Exact Match)

Contract Name:
GemJoin8

Compiler Version
v0.5.12+commit.7709ece9

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion, GNU GPLv3 license
/**
 *Submitted for verification at Etherscan.io on 2020-11-12
*/

// hevm: flattened sources of src/join-8.sol
pragma solidity >=0.5.12;

////// lib/dss-deploy/lib/dss/src/lib.sol
// SPDX-License-Identifier: AGPL-3.0-or-later

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU 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 General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

/* pragma solidity >=0.5.12; */

contract LibNote {
    event LogNote(
        bytes4   indexed  sig,
        address  indexed  usr,
        bytes32  indexed  arg1,
        bytes32  indexed  arg2,
        bytes             data
    ) anonymous;

    modifier note {
        _;
        assembly {
            // log an 'anonymous' event with a constant 6 words of calldata
            // and four indexed topics: selector, caller, arg1 and arg2
            let mark := msize()                       // end of memory ensures zero
            mstore(0x40, add(mark, 288))              // update free memory pointer
            mstore(mark, 0x20)                        // bytes type data offset
            mstore(add(mark, 0x20), 224)              // bytes size (padded)
            calldatacopy(add(mark, 0x40), 0, 224)     // bytes payload
            log4(mark, 288,                           // calldata
                 shl(224, shr(224, calldataload(0))), // msg.sig
                 caller(),                            // msg.sender
                 calldataload(4),                     // arg1
                 calldataload(36)                     // arg2
                )
        }
    }
}

////// src/join-8.sol
// SPDX-License-Identifier: AGPL-3.0-or-later

/// join-8.sol -- Non-standard token adapters

// Copyright (C) 2018 Rain <[email protected]>
// Copyright (C) 2018-2020 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; */

/* import "dss/lib.sol"; */

interface VatLike_17 {
    function slip(bytes32, address, int256) external;
}

interface GemLike_11 {
    function decimals() external view returns (uint8);
    function transfer(address,uint256) external returns (bool);
    function transferFrom(address,address,uint256) external returns (bool);
    function erc20Impl() external view returns (address);
}

// GemJoin8
// For a token that has a lower precision than 18, has decimals and it is upgradable (like GUSD)

contract GemJoin8 is LibNote {
    // --- Auth ---
    mapping (address => uint256) public wards;
    function rely(address usr) external note auth { wards[usr] = 1; }
    function deny(address usr) external note auth { wards[usr] = 0; }
    modifier auth { require(wards[msg.sender] == 1); _; }

    VatLike_17  public vat;
    bytes32  public ilk;
    GemLike_11  public gem;
    uint256  public dec;
    uint256  public live;  // Access Flag

    mapping (address => uint256) public implementations;

    constructor(address vat_, bytes32 ilk_, address gem_) public {
        gem = GemLike_11(gem_);
        dec = gem.decimals();
        require(dec < 18, "GemJoin8/decimals-18-or-higher");
        wards[msg.sender] = 1;
        live = 1;
        setImplementation(gem.erc20Impl(), 1);
        vat = VatLike_17(vat_);
        ilk = ilk_;
    }

    function cage() external note auth {
        live = 0;
    }

    function setImplementation(address implementation, uint256 permitted) public auth note {
        implementations[implementation] = permitted;  // 1 live, 0 disable
    }

    function mul(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require(y == 0 || (z = x * y) / y == x, "GemJoin8/overflow");
    }

    function join(address urn, uint256 wad) public note {
        require(live == 1, "GemJoin8/not-live");
        uint256 wad18 = mul(wad, 10 ** (18 - dec));
        require(int256(wad18) >= 0, "GemJoin8/overflow");
        require(implementations[gem.erc20Impl()] == 1, "GemJoin8/implementation-invalid");
        vat.slip(ilk, urn, int256(wad18));
        require(gem.transferFrom(msg.sender, address(this), wad), "GemJoin8/failed-transfer");
    }

    function exit(address guy, uint256 wad) public note {
        uint256 wad18 = mul(wad, 10 ** (18 - dec));
        require(int256(wad18) >= 0, "GemJoin8/overflow");
        require(implementations[gem.erc20Impl()] == 1, "GemJoin8/implementation-invalid");
        vat.slip(ilk, msg.sender, -int256(wad18));
        require(gem.transfer(guy, wad), "GemJoin8/failed-transfer");
    }
}

Contract Security Audit

Contract ABI

API
[{"inputs":[{"internalType":"address","name":"vat_","type":"address"},{"internalType":"bytes32","name":"ilk_","type":"bytes32"},{"internalType":"address","name":"gem_","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":true,"inputs":[{"indexed":true,"internalType":"bytes4","name":"sig","type":"bytes4"},{"indexed":true,"internalType":"address","name":"usr","type":"address"},{"indexed":true,"internalType":"bytes32","name":"arg1","type":"bytes32"},{"indexed":true,"internalType":"bytes32","name":"arg2","type":"bytes32"},{"indexed":false,"internalType":"bytes","name":"data","type":"bytes"}],"name":"LogNote","type":"event"},{"constant":false,"inputs":[],"name":"cage","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"dec","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"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":"guy","type":"address"},{"internalType":"uint256","name":"wad","type":"uint256"}],"name":"exit","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"gem","outputs":[{"internalType":"contract GemLike_11","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"ilk","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"implementations","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"urn","type":"address"},{"internalType":"uint256","name":"wad","type":"uint256"}],"name":"join","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"live","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"usr","type":"address"}],"name":"rely","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"implementation","type":"address"},{"internalType":"uint256","name":"permitted","type":"uint256"}],"name":"setImplementation","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"vat","outputs":[{"internalType":"contract VatLike_17","name":"","type":"address"}],"payable":false,"stateMutability":"view","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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Deployed Bytecode

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

00000000000000000000000035d1b3f3d7966a1dfe207aa4514c12a259a0492b475553442d410000000000000000000000000000000000000000000000000000000000000000000000000000056fd409e1d7a124bd7017459dfea2f387b6d5cd

-----Decoded View---------------
Arg [0] : vat_ (address): 0x35D1b3F3D7966A1DFe207aa4514C12a259A0492B
Arg [1] : ilk_ (bytes32): 0x475553442d410000000000000000000000000000000000000000000000000000
Arg [2] : gem_ (address): 0x056Fd409E1d7A124BD7017459dFEa2F387b6d5Cd

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 00000000000000000000000035d1b3f3d7966a1dfe207aa4514c12a259a0492b
Arg [1] : 475553442d410000000000000000000000000000000000000000000000000000
Arg [2] : 000000000000000000000000056fd409e1d7a124bd7017459dfea2f387b6d5cd


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Swarm Source

bzzr://24a6f450447b5ad3c2575096b6e7e9ce5f2a5dcffb86c965454787bb5e414473

Block Uncle Number Difficulty Gas Used Reward
View All Uncles
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OVERVIEW

Sky (formerly Maker) enables users to get rewarded for non-custodial savings.

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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.