Warning! Contract bytecode has been changed and doesn't match the verified one. Therefore, interaction with this smart contract may be risky.
- Contract name:
- ProxyFactory
- Optimization enabled
- false
- Compiler version
- v0.5.14+commit.01f1aaa4
- EVM Version
- default
- Verified at
- 2021-05-13T12:53:54.965247Z
Contract source code
pragma solidity ^0.5.3;
interface IProxyCreationCallback {
function proxyCreated(Proxy proxy, address _mastercopy, bytes calldata initializer, uint256 saltNonce) external;
}
/// @title IProxy - Helper interface to access masterCopy of the Proxy on-chain
/// @author Richard Meissner - <[email protected]>
interface IProxy {
function masterCopy() external view returns (address);
}
/// @title Proxy - Generic proxy contract allows to execute all transactions applying the code of a master contract.
/// @author Stefan George - <[email protected]>
/// @author Richard Meissner - <[email protected]>
contract Proxy {
// masterCopy always needs to be first declared variable, to ensure that it is at the same location in the contracts to which calls are delegated.
// To reduce deployment costs this variable is internal and needs to be retrieved via `getStorageAt`
address internal masterCopy;
/// @dev Constructor function sets address of master copy contract.
/// @param _masterCopy Master copy address.
constructor(address _masterCopy)
public
{
require(_masterCopy != address(0), "Invalid master copy address provided");
masterCopy = _masterCopy;
}
/// @dev Fallback function forwards all transactions and returns all received return data.
function ()
external
payable
{
// solium-disable-next-line security/no-inline-assembly
assembly {
let masterCopy := and(sload(0), 0xffffffffffffffffffffffffffffffffffffffff)
// 0xa619486e == keccak("masterCopy()"). The value is right padded to 32-bytes with 0s
if eq(calldataload(0), 0xa619486e00000000000000000000000000000000000000000000000000000000) {
mstore(0, masterCopy)
return(0, 0x20)
}
calldatacopy(0, 0, calldatasize())
let success := delegatecall(gas, masterCopy, 0, calldatasize(), 0, 0)
returndatacopy(0, 0, returndatasize())
if eq(success, 0) { revert(0, returndatasize()) }
return(0, returndatasize())
}
}
}
/// @title Proxy Factory - Allows to create new proxy contact and execute a message call to the new proxy within one transaction.
/// @author Stefan George - <[email protected]>
contract ProxyFactory {
event ProxyCreation(Proxy proxy);
/// @dev Allows to create new proxy contact and execute a message call to the new proxy within one transaction.
/// @param masterCopy Address of master copy.
/// @param data Payload for message call sent to new proxy contract.
function createProxy(address masterCopy, bytes memory data)
public
returns (Proxy proxy)
{
proxy = new Proxy(masterCopy);
if (data.length > 0)
// solium-disable-next-line security/no-inline-assembly
assembly {
if eq(call(gas, proxy, 0, add(data, 0x20), mload(data), 0, 0), 0) { revert(0, 0) }
}
emit ProxyCreation(proxy);
}
/// @dev Allows to retrieve the runtime code of a deployed Proxy. This can be used to check that the expected Proxy was deployed.
function proxyRuntimeCode() public pure returns (bytes memory) {
return type(Proxy).runtimeCode;
}
/// @dev Allows to retrieve the creation code used for the Proxy deployment. With this it is easily possible to calculate predicted address.
function proxyCreationCode() public pure returns (bytes memory) {
return type(Proxy).creationCode;
}
/// @dev Allows to create new proxy contact using CREATE2 but it doesn't run the initializer.
/// This method is only meant as an utility to be called from other methods
/// @param _mastercopy Address of master copy.
/// @param initializer Payload for message call sent to new proxy contract.
/// @param saltNonce Nonce that will be used to generate the salt to calculate the address of the new proxy contract.
function deployProxyWithNonce(address _mastercopy, bytes memory initializer, uint256 saltNonce)
internal
returns (Proxy proxy)
{
// If the initializer changes the proxy address should change too. Hashing the initializer data is cheaper than just concatinating it
bytes32 salt = keccak256(abi.encodePacked(keccak256(initializer), saltNonce));
bytes memory deploymentData = abi.encodePacked(type(Proxy).creationCode, uint256(_mastercopy));
// solium-disable-next-line security/no-inline-assembly
assembly {
proxy := create2(0x0, add(0x20, deploymentData), mload(deploymentData), salt)
}
require(address(proxy) != address(0), "Create2 call failed");
}
/// @dev Allows to create new proxy contact and execute a message call to the new proxy within one transaction.
/// @param _mastercopy Address of master copy.
/// @param initializer Payload for message call sent to new proxy contract.
/// @param saltNonce Nonce that will be used to generate the salt to calculate the address of the new proxy contract.
function createProxyWithNonce(address _mastercopy, bytes memory initializer, uint256 saltNonce)
public
returns (Proxy proxy)
{
proxy = deployProxyWithNonce(_mastercopy, initializer, saltNonce);
if (initializer.length > 0)
// solium-disable-next-line security/no-inline-assembly
assembly {
if eq(call(gas, proxy, 0, add(initializer, 0x20), mload(initializer), 0, 0), 0) { revert(0,0) }
}
emit ProxyCreation(proxy);
}
/// @dev Allows to create new proxy contact, execute a message call to the new proxy and call a specified callback within one transaction
/// @param _mastercopy Address of master copy.
/// @param initializer Payload for message call sent to new proxy contract.
/// @param saltNonce Nonce that will be used to generate the salt to calculate the address of the new proxy contract.
/// @param callback Callback that will be invoced after the new proxy contract has been successfully deployed and initialized.
function createProxyWithCallback(address _mastercopy, bytes memory initializer, uint256 saltNonce, IProxyCreationCallback callback)
public
returns (Proxy proxy)
{
uint256 saltNonceWithCallback = uint256(keccak256(abi.encodePacked(saltNonce, callback)));
proxy = createProxyWithNonce(_mastercopy, initializer, saltNonceWithCallback);
if (address(callback) != address(0))
callback.proxyCreated(proxy, _mastercopy, initializer, saltNonce);
}
/// @dev Allows to get the address for a new proxy contact created via `createProxyWithNonce`
/// This method is only meant for address calculation purpose when you use an initializer that would revert,
/// therefore the response is returned with a revert. When calling this method set `from` to the address of the proxy factory.
/// @param _mastercopy Address of master copy.
/// @param initializer Payload for message call sent to new proxy contract.
/// @param saltNonce Nonce that will be used to generate the salt to calculate the address of the new proxy contract.
function calculateCreateProxyWithNonceAddress(address _mastercopy, bytes calldata initializer, uint256 saltNonce)
external
returns (Proxy proxy)
{
proxy = deployProxyWithNonce(_mastercopy, initializer, saltNonce);
revert(string(abi.encodePacked(proxy)));
}
}
Contract ABI
[{"type":"event","name":"ProxyCreation","inputs":[{"type":"address","name":"proxy","internalType":"contract Proxy","indexed":false}],"anonymous":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[{"type":"address","name":"proxy","internalType":"contract Proxy"}],"name":"calculateCreateProxyWithNonceAddress","inputs":[{"type":"address","name":"_mastercopy","internalType":"address"},{"type":"bytes","name":"initializer","internalType":"bytes"},{"type":"uint256","name":"saltNonce","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[{"type":"address","name":"proxy","internalType":"contract Proxy"}],"name":"createProxy","inputs":[{"type":"address","name":"masterCopy","internalType":"address"},{"type":"bytes","name":"data","internalType":"bytes"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[{"type":"address","name":"proxy","internalType":"contract Proxy"}],"name":"createProxyWithCallback","inputs":[{"type":"address","name":"_mastercopy","internalType":"address"},{"type":"bytes","name":"initializer","internalType":"bytes"},{"type":"uint256","name":"saltNonce","internalType":"uint256"},{"type":"address","name":"callback","internalType":"contract IProxyCreationCallback"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[{"type":"address","name":"proxy","internalType":"contract Proxy"}],"name":"createProxyWithNonce","inputs":[{"type":"address","name":"_mastercopy","internalType":"address"},{"type":"bytes","name":"initializer","internalType":"bytes"},{"type":"uint256","name":"saltNonce","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"pure","payable":false,"outputs":[{"type":"bytes","name":"","internalType":"bytes"}],"name":"proxyCreationCode","inputs":[],"constant":true},{"type":"function","stateMutability":"pure","payable":false,"outputs":[{"type":"bytes","name":"","internalType":"bytes"}],"name":"proxyRuntimeCode","inputs":[],"constant":true}]
Contract Creation Code
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