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Outline

•  contract LibNote
• interface VatLike
•    - function slip(bytes32, address, int25 ...
• interface GemLike
•    - function decimals()
•    - function transfer(address, uint256)
•    - function transferFrom(address, addres ...
•  contract GemJoin5 is LibNote *
•    - function rely(address usr)
•    - function deny(address usr)
•    - function cage()
•    - function mul(uint256 x, uint256 y)
•    - function join(address urn, uint256 am ...
•    - function exit(address guy, uint256 am ...

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/**
 *Submitted for verification at Etherscan.io on 2021-11-17
*/

// hevm: flattened sources of src/join-5.sol

pragma solidity >=0.5.12;

////// lib/dss-deploy/lib/dss/src/lib.sol

// 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-5.sol

/// join-5.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 {
    function slip(bytes32, address, int256) external;
}

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

// For a token that has a lower precision than 18 and it has decimals (like USDC)

contract GemJoin5 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 public vat;
    bytes32 public ilk;
    GemLike public gem;
    uint256 public dec;
    uint256 public live;  // Access Flag

    constructor(address vat_, bytes32 ilk_, address gem_) public {
        gem = GemLike(gem_);
        dec = gem.decimals();
        require(dec < 18, "GemJoin5/decimals-18-or-higher");
        wards[msg.sender] = 1;
        live = 1;
        vat = VatLike(vat_);
        ilk = ilk_;
    }

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

    function mul(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require(y == 0 || (z = x * y) / y == x, "GemJoin5/overflow");
    }

    function join(address urn, uint256 amt) public note {
        require(live == 1, "GemJoin5/not-live");
        uint256 wad = mul(amt, 10 ** (18 - dec));
        require(int256(wad) >= 0, "GemJoin5/overflow");
        vat.slip(ilk, urn, int256(wad));
        require(gem.transferFrom(msg.sender, address(this), amt), "GemJoin5/failed-transfer");
    }

    function exit(address guy, uint256 amt) public note {
        uint256 wad = mul(amt, 10 ** (18 - dec));
        require(int256(wad) >= 0, "GemJoin5/overflow");
        vat.slip(ilk, msg.sender, -int256(wad));
        require(gem.transfer(guy, amt), "GemJoin5/failed-transfer");
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"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":"amt","type":"uint256"}],"name":"exit","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"gem","outputs":[{"internalType":"contract GemLike","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":false,"inputs":[{"internalType":"address","name":"urn","type":"address"},{"internalType":"uint256","name":"amt","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":true,"inputs":[],"name":"vat","outputs":[{"internalType":"contract VatLike","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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bzzr://b2c46705dd7c1fb4774a774a94812876d91e54f55eb9450255b3e3f16be827bc