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// SPDX-License-Identifier: LGPL-3.0-only
/* solhint-disable one-contract-per-file */
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 := sload(0)
            // 0xa619486e == keccak("masterCopy()"). The value is right padded to 32-bytes with 0s
            if eq(calldataload(0), 0xa619486e00000000000000000000000000000000000000000000000000000000) {
                mstore(0, shr(12, shl(12, _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())
        }
    }
}

{
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

[{"inputs":[{"internalType":"address","name":"_singleton","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"stateMutability":"payable","type":"fallback"}]

608060405234801561001057600080fd5b506040516101d63803806101d68339818101604052602081101561003357600080fd5b8101908080519060200190929190505050600073ffffffffffffffffffffffffffffffffffffffff168173ffffffffffffffffffffffffffffffffffffffff1614156100ca576040517f08c379a00000000000000000000000000000000000000000000000000000000081526004018080602001828103825260228152602001806101b46022913960400191505060405180910390fd5b806000806101000a81548173ffffffffffffffffffffffffffffffffffffffff021916908373ffffffffffffffffffffffffffffffffffffffff16021790555050609b806101196000396000f3fe60806040526000547fa619486e00000000000000000000000000000000000000000000000000000000600035141560405780600c1b600c1c60005260206000f35b3660008037600080366000845af43d6000803e60008114156060573d6000fd5b3d6000f3fea2646970667358221220bfbe5e66dfccd59d80684323ec36a561ddc5ef3b39a33a941f25cabefff21eb964736f6c63430007060033496e76616c69642073696e676c65746f6e20616464726573732070726f7669646564000000000000000000000000d063b02a3d48819b6c8d3389d3c8e023d265141f

0x60806040526000547fa619486e00000000000000000000000000000000000000000000000000000000600035141560405780600c1b600c1c60005260206000f35b3660008037600080366000845af43d6000803e60008114156060573d6000fd5b3d6000f3fea2646970667358221220bfbe5e66dfccd59d80684323ec36a561ddc5ef3b39a33a941f25cabefff21eb964736f6c63430007060033

000000000000000000000000d063b02a3d48819b6c8d3389d3c8e023d265141f

-----Decoded View---------------
Arg [0] : _singleton (address): 0xd063b02A3D48819B6C8d3389D3c8E023d265141f

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000d063b02a3d48819b6c8d3389d3c8e023d265141f