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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.
- Contract name:
- GemJoin
- Optimization enabled
- false
- Compiler version
- v0.5.12+commit.7709ece9
- EVM Version
- default
- Verified at
- 2025-03-29T13:49:18.537527Z
Constructor Arguments
0x00000000000000000000000035d1b3f3d7966a1dfe207aa4514c12a259a0492b4554482d42000000000000000000000000000000000000000000000000000000000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2
Arg [0] (address) : 0x35d1b3f3d7966a1dfe207aa4514c12a259a0492b
Arg [1] (bytes32) : 4554482d42000000000000000000000000000000000000000000000000000000
Arg [2] (address) : 0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2
Contract source code
/**
*Submitted for verification at Etherscan.io on 2020-10-13
*/
// SPDX-License-Identifier: AGPL-3.0-or-later
/// 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;
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
)
}
}
}
interface GemLike {
function decimals() external view returns (uint);
function transfer(address,uint) external returns (bool);
function transferFrom(address,address,uint) external returns (bool);
}
interface DSTokenLike {
function mint(address,uint) external;
function burn(address,uint) external;
}
interface 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; // CDP Engine
bytes32 public ilk; // Collateral Type
GemLike public gem;
uint public dec;
uint public live; // Active 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 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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ByteCode
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