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Address Contract Verified

Address 0x217e42CEB2eAE9ECB788fDF0e31c806c531760A3
Balance 0 ETH
Nonce 1
Code Size 3369 bytes
Creator 0x9c1a61a0...F1EE at tx 0x402b1994...abefd8
Indexed Transactions 0
External Etherscan · Sourcify

Contract Bytecode

3369 bytes
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Verified Source Code Full Match

Compiler: v0.6.12+commit.27d51765 EVM: istanbul Optimization: Yes (200 runs)
join-7-auth.sol 118 lines 
// SPDX-License-Identifier: AGPL-3.0-or-later

/// join-7-auth.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 ^0.6.12;

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

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

// AuthGemJoin7
// For an upgradable token (like USDT) which doesn't return bool on transfers and may charge fees
//  If the token is deprecated changing the implementation behind, this prevents joins
//   and exits until the implementation is reviewed and approved by governance.

contract AuthGemJoin7 {
    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); _; }

    VatLike public immutable vat;
    bytes32 public immutable ilk;
    GemLike public immutable gem;
    uint256 public immutable dec;
    uint256 public live; // Access flag

    // Events
    event Rely(address indexed usr);
    event Deny(address indexed usr);
    event Join(address indexed usr, uint256 amt, address indexed msgSender);
    event Exit(address indexed usr, uint256 amt);
    event Cage();
    event SetImplementation(address indexed implementation, uint256 permitted);

    mapping (address => uint256) public implementations;

    constructor(address vat_, bytes32 ilk_, address gem_) public {
        gem = GemLike(gem_);
        uint256 dec_ = dec = GemLike(gem_).decimals();
        require(dec_ < 18, "AuthGemJoin7/decimals-18-or-higher");
        wards[msg.sender] = 1;
        live = 1;
        vat = VatLike(vat_);
        ilk = ilk_;
        setImplementation(address(GemLike(gem_).upgradedAddress()), 1);
        emit Rely(msg.sender);
    }

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

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

    function mul(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require(y == 0 || (z = x * y) / y == x, "AuthGemJoin7/overflow");
    }

    function sub(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require((z = x - y) <= x, "AuthGemJoin7/underflow");
    }

    function join(address usr, uint256 amt, address msgSender) external auth returns (uint256 wad) {
        require(live == 1, "AuthGemJoin7/not-live");
        require(implementations[gem.upgradedAddress()] == 1, "AuthGemJoin7/implementation-invalid");
        uint256 bal = gem.balanceOf(address(this));
        gem.transferFrom(msgSender, address(this), amt);
        uint256 actualAmt = sub(gem.balanceOf(address(this)), bal);
        wad = mul(actualAmt, 10 ** (18 - dec));
        require(int256(wad) >= 0, "AuthGemJoin7/overflow");
        vat.slip(ilk, usr, int256(wad));
        emit Join(usr, actualAmt, msgSender);
    }

    function exit(address usr, uint256 amt) external {
        uint256 wad = mul(amt, 10 ** (18 - dec));
        require(int256(wad) >= 0, "AuthGemJoin7/overflow");
        require(implementations[gem.upgradedAddress()] == 1, "AuthGemJoin7/implementation-invalid");
        vat.slip(ilk, msg.sender, -int256(wad));
        gem.transfer(usr, amt);
        emit Exit(usr, amt);
    }
}

Read Contract

dec 0xb3bcfa82 → uint256
gem 0x7bd2bea7 → address
ilk 0xc5ce281e → bytes32
implementations 0xf79eb32c → uint256
live 0x957aa58c → uint256
vat 0x36569e77 → address
wards 0xbf353dbb → uint256

Write Contract 6 functions

These functions modify contract state and require a wallet transaction to execute.

cage 0x69245009
No parameters
deny 0x9c52a7f1
address usr
exit 0xef693bed
address usr
uint256 amt
join 0xd14b1e4b
address usr
uint256 amt
address msgSender
returns: uint256
rely 0x65fae35e
address usr
setImplementation 0x3033a4e5
address implementation
uint256 permitted

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