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Contract Source Code:
File 1 of 1 : Proxy
pragma solidity >=0.5.0 <0.7.0; /// @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()) } } }
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