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Read Contract
Write Contract
- Contract name:
- DSProxy
- Optimization enabled
- false
- Compiler version
- v0.5.12+commit.7709ece9
- EVM Version
- petersburg
- Verified at
- 2021-10-28T14:08:45.182089Z
Constructor Arguments
000000000000000000000000bc92f8920425e859105e0477a5fea683737d8358
Arg [0] (address) : 0xbc92f8920425e859105e0477a5fea683737d8358
Contract source code
pragma solidity >=0.5.0 <0.6.0;
interface DSAuthority {
function canCall(
address src, address dst, bytes4 sig
) external 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;
constructor() public {
owner = msg.sender;
emit LogSetOwner(msg.sender);
}
function setOwner(address owner_)
public
auth
{
owner = owner_;
emit LogSetOwner(owner);
}
function setAuthority(DSAuthority authority_)
public
auth
{
authority = authority_;
emit LogSetAuthority(address(authority));
}
modifier auth {
require(isAuthorized(msg.sender, msg.sig), "ds-auth-unauthorized");
_;
}
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(address(0))) {
return false;
} else {
return authority.canCall(src, address(this), sig);
}
}
}
contract DSNote {
event LogNote(
bytes4 indexed sig,
address indexed guy,
bytes32 indexed foo,
bytes32 indexed bar,
uint256 wad,
bytes fax
) anonymous;
modifier note {
bytes32 foo;
bytes32 bar;
uint256 wad;
assembly {
foo := calldataload(4)
bar := calldataload(36)
wad := callvalue()
}
_;
emit LogNote(msg.sig, msg.sender, foo, bar, wad, msg.data);
}
}
// DSProxy
// Allows code execution using a persistant identity This can be very
// useful to execute a sequence of atomic actions. Since the owner of
// the proxy can be changed, this allows for dynamic ownership models
// i.e. a multisig
contract DSProxy is DSAuth, DSNote {
DSProxyCache public cache; // global cache for contracts
constructor(address _cacheAddr) public {
setCache(_cacheAddr);
}
function() external payable {
}
// use the proxy to execute calldata _data on contract _code
function execute(bytes memory _code, bytes memory _data)
public
payable
returns (address target, bytes memory response)
{
target = cache.read(_code);
if (target == address(0)) {
// deploy contract & store its address in cache
target = cache.write(_code);
}
response = execute(target, _data);
}
function execute(address _target, bytes memory _data)
public
auth
note
payable
returns (bytes memory response)
{
require(_target != address(0), "ds-proxy-target-address-required");
// call contract in current context
assembly {
let succeeded := delegatecall(sub(gas, 5000), _target, add(_data, 0x20), mload(_data), 0, 0)
let size := returndatasize
response := mload(0x40)
mstore(0x40, add(response, and(add(add(size, 0x20), 0x1f), not(0x1f))))
mstore(response, size)
returndatacopy(add(response, 0x20), 0, size)
switch iszero(succeeded)
case 1 {
// throw if delegatecall failed
revert(add(response, 0x20), size)
}
}
}
//set new cache
function setCache(address _cacheAddr)
public
auth
note
returns (bool)
{
require(_cacheAddr != address(0), "ds-proxy-cache-address-required");
cache = DSProxyCache(_cacheAddr); // overwrite cache
return true;
}
}
// DSProxyFactory
// This factory deploys new proxy instances through build()
// Deployed proxy addresses are logged
contract DSProxyFactory {
event Created(address indexed sender, address indexed owner, address proxy, address cache);
mapping(address=>bool) public isProxy;
DSProxyCache public cache;
constructor() public {
cache = new DSProxyCache();
}
// deploys a new proxy instance
// sets owner of proxy to caller
function build() public returns (address payable proxy) {
proxy = build(msg.sender);
}
// deploys a new proxy instance
// sets custom owner of proxy
function build(address owner) public returns (address payable proxy) {
proxy = address(new DSProxy(address(cache)));
emit Created(msg.sender, owner, address(proxy), address(cache));
DSProxy(proxy).setOwner(owner);
isProxy[proxy] = true;
}
}
// DSProxyCache
// This global cache stores addresses of contracts previously deployed
// by a proxy. This saves gas from repeat deployment of the same
// contracts and eliminates blockchain bloat.
// By default, all proxies deployed from the same factory store
// contracts in the same cache. The cache a proxy instance uses can be
// changed. The cache uses the sha3 hash of a contract's bytecode to
// lookup the address
contract DSProxyCache {
mapping(bytes32 => address) cache;
function read(bytes memory _code) public view returns (address) {
bytes32 hash = keccak256(_code);
return cache[hash];
}
function write(bytes memory _code) public returns (address target) {
assembly {
target := create(0, add(_code, 0x20), mload(_code))
switch iszero(extcodesize(target))
case 1 {
// throw if contract failed to deploy
revert(0, 0)
}
}
bytes32 hash = keccak256(_code);
cache[hash] = target;
}
}
Contract ABI
[{"type":"constructor","stateMutability":"nonpayable","payable":false,"inputs":[{"type":"address","name":"_cacheAddr","internalType":"address"}]},{"type":"event","name":"LogNote","inputs":[{"type":"bytes4","name":"sig","internalType":"bytes4","indexed":true},{"type":"address","name":"guy","internalType":"address","indexed":true},{"type":"bytes32","name":"foo","internalType":"bytes32","indexed":true},{"type":"bytes32","name":"bar","internalType":"bytes32","indexed":true},{"type":"uint256","name":"wad","internalType":"uint256","indexed":false},{"type":"bytes","name":"fax","internalType":"bytes","indexed":false}],"anonymous":true},{"type":"event","name":"LogSetAuthority","inputs":[{"type":"address","name":"authority","internalType":"address","indexed":true}],"anonymous":false},{"type":"event","name":"LogSetOwner","inputs":[{"type":"address","name":"owner","internalType":"address","indexed":true}],"anonymous":false},{"type":"fallback","stateMutability":"payable","payable":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":"","internalType":"contract DSAuthority"}],"name":"authority","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":"","internalType":"contract DSProxyCache"}],"name":"cache","inputs":[],"constant":true},{"type":"function","stateMutability":"payable","payable":true,"outputs":[{"type":"bytes","name":"response","internalType":"bytes"}],"name":"execute","inputs":[{"type":"address","name":"_target","internalType":"address"},{"type":"bytes","name":"_data","internalType":"bytes"}],"constant":false},{"type":"function","stateMutability":"payable","payable":true,"outputs":[{"type":"address","name":"target","internalType":"address"},{"type":"bytes","name":"response","internalType":"bytes"}],"name":"execute","inputs":[{"type":"bytes","name":"_code","internalType":"bytes"},{"type":"bytes","name":"_data","internalType":"bytes"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":"","internalType":"address"}],"name":"owner","inputs":[],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"setAuthority","inputs":[{"type":"address","name":"authority_","internalType":"contract DSAuthority"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"setCache","inputs":[{"type":"address","name":"_cacheAddr","internalType":"address"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"setOwner","inputs":[{"type":"address","name":"owner_","internalType":"address"}],"constant":false}]
Deployed ByteCode
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