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Warning! Contract bytecode has been changed and doesn't match the verified one. Therefore, interaction with this smart contract may be risky.
This contract has been partially verified via Sourcify.
View contract in Sourcify repository
- Contract name:
- GemJoin
- Optimization enabled
- false
- Compiler version
- v0.5.12+commit.7709ece9
- EVM Version
- petersburg
- Verified at
- 2026-03-21T18:27:57.067638Z
Constructor Arguments
00000000000000000000000035d1b3f3d7966a1dfe207aa4514c12a259a0492b4554482d43000000000000000000000000000000000000000000000000000000000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2
Arg [0] (address) : 0x35d1b3f3d7966a1dfe207aa4514c12a259a0492b
Arg [1] (bytes32) : 4554482d43000000000000000000000000000000000000000000000000000000
Arg [2] (address) : 0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2
GemJoin.sol
/**
*Submitted for verification at Etherscan.io on 2019-11-14
*/
// hevm: flattened sources of /nix/store/8xb41r4qd0cjb63wcrxf1qmfg88p0961-dss-6fd7de0/src/join.sol
pragma solidity =0.5.12;
////// /nix/store/8xb41r4qd0cjb63wcrxf1qmfg88p0961-dss-6fd7de0/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
)
}
}
}
////// /nix/store/8xb41r4qd0cjb63wcrxf1qmfg88p0961-dss-6fd7de0/src/join.sol
/// join.sol -- Basic token adapters
// Copyright (C) 2018 Rain <rainbreak@riseup.net>
//
// 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 "./lib.sol"; */
contract GemLike {
function decimals() public view returns (uint);
function transfer(address,uint) external returns (bool);
function transferFrom(address,address,uint) external returns (bool);
}
contract DSTokenLike {
function mint(address,uint) external;
function burn(address,uint) external;
}
contract VatLike {
function slip(bytes32,address,int) external;
function move(address,address,uint) external;
}
/*
Here we provide *adapters* to connect the Vat to arbitrary external
token implementations, creating a bounded context for the Vat. The
adapters here are provided as working examples:
- `GemJoin`: For well behaved ERC20 tokens, with simple transfer
semantics.
- `ETHJoin`: For native Ether.
- `DaiJoin`: For connecting internal Dai balances to an external
`DSToken` implementation.
In practice, adapter implementations will be varied and specific to
individual collateral types, accounting for different transfer
semantics and token standards.
Adapters need to implement two basic methods:
- `join`: enter collateral into the system
- `exit`: remove collateral from the system
*/
contract GemJoin is LibNote {
// --- Auth ---
mapping (address => uint) 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, "GemJoin/not-authorized");
_;
}
VatLike public vat;
bytes32 public ilk;
GemLike public gem;
uint public dec;
uint public live; // Access Flag
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();
}
function cage() external note auth {
live = 0;
}
function join(address usr, uint wad) external note {
require(live == 1, "GemJoin/not-live");
require(int(wad) >= 0, "GemJoin/overflow");
vat.slip(ilk, usr, int(wad));
require(gem.transferFrom(msg.sender, address(this), wad), "GemJoin/failed-transfer");
}
function exit(address usr, uint wad) external note {
require(wad <= 2 ** 255, "GemJoin/overflow");
vat.slip(ilk, msg.sender, -int(wad));
require(gem.transfer(usr, wad), "GemJoin/failed-transfer");
}
}
contract ETHJoin is LibNote {
// --- Auth ---
mapping (address => uint) 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, "ETHJoin/not-authorized");
_;
}
VatLike public vat;
bytes32 public ilk;
uint public live; // Access Flag
constructor(address vat_, bytes32 ilk_) public {
wards[msg.sender] = 1;
live = 1;
vat = VatLike(vat_);
ilk = ilk_;
}
function cage() external note auth {
live = 0;
}
function join(address usr) external payable note {
require(live == 1, "ETHJoin/not-live");
require(int(msg.value) >= 0, "ETHJoin/overflow");
vat.slip(ilk, usr, int(msg.value));
}
function exit(address payable usr, uint wad) external note {
require(int(wad) >= 0, "ETHJoin/overflow");
vat.slip(ilk, msg.sender, -int(wad));
usr.transfer(wad);
}
}
contract DaiJoin is LibNote {
// --- Auth ---
mapping (address => uint) 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, "DaiJoin/not-authorized");
_;
}
VatLike public vat;
DSTokenLike public dai;
uint public live; // Access Flag
constructor(address vat_, address dai_) public {
wards[msg.sender] = 1;
live = 1;
vat = VatLike(vat_);
dai = DSTokenLike(dai_);
}
function cage() external note auth {
live = 0;
}
uint constant ONE = 10 ** 27;
function mul(uint x, uint y) internal pure returns (uint z) {
require(y == 0 || (z = x * y) / y == x);
}
function join(address usr, uint wad) external note {
vat.move(address(this), usr, mul(ONE, wad));
dai.burn(msg.sender, wad);
}
function exit(address usr, uint wad) external note {
require(live == 1, "DaiJoin/not-live");
vat.move(msg.sender, address(this), mul(ONE, wad));
dai.mint(usr, wad);
}
}
Compiler Settings
{"remappings":[],"optimizer":{"runs":200,"enabled":false},"libraries":{},"evmVersion":"petersburg","compilationTarget":{"GemJoin.sol":"GemJoin"}}
Contract ABI
[{"type":"constructor","stateMutability":"nonpayable","payable":false,"inputs":[{"type":"address","name":"vat_","internalType":"address"},{"type":"bytes32","name":"ilk_","internalType":"bytes32"},{"type":"address","name":"gem_","internalType":"address"}]},{"type":"event","name":"LogNote","inputs":[{"type":"bytes4","name":"sig","internalType":"bytes4","indexed":true},{"type":"address","name":"usr","internalType":"address","indexed":true},{"type":"bytes32","name":"arg1","internalType":"bytes32","indexed":true},{"type":"bytes32","name":"arg2","internalType":"bytes32","indexed":true},{"type":"bytes","name":"data","internalType":"bytes","indexed":false}],"anonymous":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"cage","inputs":[],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"dec","inputs":[],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"deny","inputs":[{"type":"address","name":"usr","internalType":"address"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"exit","inputs":[{"type":"address","name":"usr","internalType":"address"},{"type":"uint256","name":"wad","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":"","internalType":"contract GemLike"}],"name":"gem","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"bytes32","name":"","internalType":"bytes32"}],"name":"ilk","inputs":[],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"join","inputs":[{"type":"address","name":"usr","internalType":"address"},{"type":"uint256","name":"wad","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"live","inputs":[],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"rely","inputs":[{"type":"address","name":"usr","internalType":"address"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":"","internalType":"contract VatLike"}],"name":"vat","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"wards","inputs":[{"type":"address","name":"","internalType":"address"}],"constant":true}]
Contract Creation Code
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