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// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;

import "./GnosisSafeProxy.sol";
import "./IProxyCreationCallback.sol";

/// @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 GnosisSafeProxyFactory {
    event ProxyCreation(GnosisSafeProxy proxy, address singleton);

    mapping(address => address) public userToProxy;

    /// @dev Allows to create new proxy contact and execute a message call to the new proxy within one transaction.
    /// @param _singleton Address of singleton contract.
    /// @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 _singleton, bytes calldata initializer, uint256 saltNonce)
        public
        returns (GnosisSafeProxy proxy)
    {
        require(saltNonce == 0, "Only nonce 0 allowed");
        proxy = deployProxyWithNonce(_singleton, initializer, saltNonce);
        if (initializer.length > 0) {
            bytes memory memInitializer = initializer;

            // solhint-disable-next-line no-inline-assembly
            assembly {
                if eq(call(gas(), proxy, 0, add(memInitializer, 0x20), mload(memInitializer), 0, 0), 0) { revert(0, 0) }
            }
        }
        emit ProxyCreation(proxy, _singleton);
    }

    /// @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(GnosisSafeProxy).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(GnosisSafeProxy).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 _singleton Address of singleton contract.
    /// @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 _singleton, bytes calldata initializer, uint256 saltNonce)
        internal
        returns (GnosisSafeProxy proxy)
    {
        address[] memory owners = decodeSetupData(initializer);
        require(owners.length == 1 && owners[0] != address(0), "Invalid proxy owner");
        address userAddress = owners[0];
        require(userToProxy[userAddress] == address(0), "User Proxy already existed");

        // 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(GnosisSafeProxy).creationCode, uint256(uint160(_singleton)));
        // solhint-disable-next-line no-inline-assembly
        assembly {
            proxy := create2(0x0, add(0x20, deploymentData), mload(deploymentData), salt)
        }

        require(address(proxy) != address(0), "Create2 call failed");

        userToProxy[userAddress] = address(proxy);
    }

    function decodeSetupData(bytes calldata initializer) internal pure returns (address[] memory owners) {
        bytes calldata parameters = initializer[4:];

        (owners,,,,,,,) =
            abi.decode(parameters, (address[], uint256, address, bytes, address, address, uint256, address));
    }

    /// @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 _singleton Address of singleton contract.
    /// @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 _singleton, bytes calldata initializer, uint256 saltNonce)
        public
        view
        returns (address safe)
    {
        bytes memory bytecode = abi.encodePacked(proxyCreationCode(), abi.encode(_singleton));
        bytes32 bytecodeHash = keccak256(bytecode);
        bytes32 salt = keccak256(abi.encodePacked(keccak256(initializer), saltNonce));

        bytes32 rawAddress = keccak256(abi.encodePacked(bytes1(0xff), address(this), salt, bytecodeHash));
        safe = address(uint160(uint256(rawAddress)));
    }
}

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;

/// @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 GnosisSafeProxy - 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 GnosisSafeProxy {
    // 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;

    /// @dev 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())
        }
    }
}

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
import "./GnosisSafeProxy.sol";

interface IProxyCreationCallback {
    function proxyCreated(
        GnosisSafeProxy proxy,
        address _singleton,
        bytes calldata initializer,
        uint256 saltNonce
    ) external;
}

{
  "evmVersion": "london",
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": [
    ":@/=src/",
    ":@openzeppelin/contracts-upgradeable/=lib/openzeppelin-contracts-upgradeable/contracts/",
    ":@openzeppelin/contracts/=lib/openzeppelin-contracts/contracts/",
    ":ds-test/=lib/solmate/lib/ds-test/src/",
    ":forge-std/=lib/forge-std/src/",
    ":openzeppelin-contracts-upgradeable/=lib/openzeppelin-contracts-upgradeable/contracts/",
    ":openzeppelin-contracts/=lib/openzeppelin-contracts/contracts/",
    ":solmate/=lib/solmate/src/"
  ],
  "viaIR": true,
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

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[{"anonymous":false,"inputs":[{"indexed":false,"internalType":"contract GnosisSafeProxy","name":"proxy","type":"address"},{"indexed":false,"internalType":"address","name":"singleton","type":"address"}],"name":"ProxyCreation","type":"event"},{"inputs":[{"internalType":"address","name":"_singleton","type":"address"},{"internalType":"bytes","name":"initializer","type":"bytes"},{"internalType":"uint256","name":"saltNonce","type":"uint256"}],"name":"calculateCreateProxyWithNonceAddress","outputs":[{"internalType":"address","name":"safe","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_singleton","type":"address"},{"internalType":"bytes","name":"initializer","type":"bytes"},{"internalType":"uint256","name":"saltNonce","type":"uint256"}],"name":"createProxyWithNonce","outputs":[{"internalType":"contract GnosisSafeProxy","name":"proxy","type":"address"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"proxyCreationCode","outputs":[{"internalType":"bytes","name":"","type":"bytes"}],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"proxyRuntimeCode","outputs":[{"internalType":"bytes","name":"","type":"bytes"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"userToProxy","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"}]

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