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Contract Source Code:
File 1 of 1 : SafeProxy.sol
// SPDX-License-Identifier: LGPL-3.0-only pragma solidity >=0.7.0 <0.9.0; /** * @title IProxy - Helper interface to access the singleton address of the Proxy on-chain. * @author Richard Meissner - @rmeissner */ interface IProxy { function masterCopy() external view returns (address); } /** * @title SafeProxy - 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 SafeProxy { // Singleton 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 singleton; /** * @notice Constructor function sets address of singleton contract. * @param _singleton Singleton address. */ constructor(address _singleton) { require(_singleton != address(0), "Invalid singleton address provided"); singleton = _singleton; } /// @dev Fallback function forwards all transactions and returns all received return data. fallback() external payable { // solhint-disable-next-line no-inline-assembly assembly { let _singleton := and(sload(0), 0xffffffffffffffffffffffffffffffffffffffff) // 0xa619486e == keccak("masterCopy()"). The value is right padded to 32-bytes with 0s if eq(calldataload(0), 0xa619486e00000000000000000000000000000000000000000000000000000000) { mstore(0, _singleton) return(0, 0x20) } calldatacopy(0, 0, calldatasize()) let success := delegatecall(gas(), _singleton, 0, calldatasize(), 0, 0) returndatacopy(0, 0, returndatasize()) if eq(success, 0) { revert(0, returndatasize()) } return(0, returndatasize()) } } }
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