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:
- MutableForwarder
- Optimization enabled
- false
- Compiler version
- v0.4.24+commit.e67f0147
- EVM Version
- byzantium
- Verified at
- 2026-05-18T21:32:57.898857Z
MutableForwarder.sol
pragma solidity ^0.4.18;
import "./DelegateProxy.sol";
import "./DSAuth.sol";
/**
* @title Forwarder proxy contract with editable target
*
* @dev For TCR Registry contracts (Registry.sol, ParamChangeRegistry.sol) we use mutable forwarders instead of using
* contracts directly. This is for better upgradeability. Since registry contracts fire all events related to registry
* entries, we want to be able to access whole history of events always on the same address. Which would be address of
* a MutableForwarder. When a registry contract is replaced with updated one, mutable forwarder just replaces target
* and all events stay still accessible on the same address.
*/
contract MutableForwarder is DelegateProxy, DSAuth {
address public target = 0xf4e6e033921b34f89b0586beb2d529e8eae3e021; // checksumed to silence warning
/**
* @dev Replaces targer forwarder contract is pointing to
* Only authenticated user can replace target
* @param _target New target to proxy into
*/
function setTarget(address _target) public auth {
target = _target;
}
function() payable {
delegatedFwd(target, msg.data);
}
}
/DSAuth.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 ^0.4.13;
contract DSAuthority {
function canCall(
address src, address dst, bytes4 sig
) public view returns (bool);
}
contract DSAuthEvents {
event LogSetAuthority (address indexed authority);
event LogSetOwner (address indexed owner);
}
contract DSAuth is DSAuthEvents {
DSAuthority public authority;
address public owner;
function DSAuth() public {
owner = msg.sender;
LogSetOwner(msg.sender);
}
function setOwner(address owner_)
public
auth
{
owner = owner_;
LogSetOwner(owner);
}
function setAuthority(DSAuthority authority_)
public
auth
{
authority = authority_;
LogSetAuthority(authority);
}
modifier auth {
require(isAuthorized(msg.sender, msg.sig));
_;
}
function isAuthorized(address src, bytes4 sig) internal view returns (bool) {
if (src == address(this)) {
return true;
} else if (src == owner) {
return true;
} else if (authority == DSAuthority(0)) {
return false;
} else {
return authority.canCall(src, this, sig);
}
}
}
/DelegateProxy.sol
pragma solidity ^0.4.18;
contract DelegateProxy {
/**
* @dev Performs a delegatecall and returns whatever the delegatecall returned (entire context execution will return!)
* @param _dst Destination address to perform the delegatecall
* @param _calldata Calldata for the delegatecall
*/
function delegatedFwd(address _dst, bytes _calldata) internal {
require(isContract(_dst));
assembly {
let result := delegatecall(sub(gas, 10000), _dst, add(_calldata, 0x20), mload(_calldata), 0, 0)
let size := returndatasize
let ptr := mload(0x40)
returndatacopy(ptr, 0, size)
// revert instead of invalid() bc if the underlying call failed with invalid() it already wasted gas.
// if the call returned error data, forward it
switch result case 0 {revert(ptr, size)}
default {return (ptr, size)}
}
}
function isContract(address _target) internal view returns (bool) {
uint256 size;
assembly {size := extcodesize(_target)}
return size > 0;
}
}
Compiler Settings
{"remappings":[],"optimizer":{"runs":0,"enabled":false},"libraries":{},"evmVersion":"byzantium","compilationTarget":{"MutableForwarder.sol":"MutableForwarder"}}
Contract ABI
[{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"setOwner","inputs":[{"type":"address","name":"owner_"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"setTarget","inputs":[{"type":"address","name":"_target"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"setAuthority","inputs":[{"type":"address","name":"authority_"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":""}],"name":"owner","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":""}],"name":"authority","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":""}],"name":"target","inputs":[],"constant":true},{"type":"fallback","stateMutability":"payable","payable":true},{"type":"event","name":"LogSetAuthority","inputs":[{"type":"address","name":"authority","indexed":true}],"anonymous":false},{"type":"event","name":"LogSetOwner","inputs":[{"type":"address","name":"owner","indexed":true}],"anonymous":false}]
Contract Creation Code
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