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• library LibBytes
•    - function trimToSize(bytes memory b, u ...
•    - function readBytes32(
• interface IERC1271Wallet
•    - function isValidSignature(bytes32 has ...
• library SignatureValidator
•    - function recoverAddr(bytes32 hash, by ...
•    - function recoverAddrImpl(bytes32 hash ...
•  contract Identity
•    - function setAddrPrivilege(address add ...
•    - function tipMiner(uint amount)
•    - function tryCatch(address to, uint va ...
•    - function execute(Transaction[] callda ...
•    - function executeBySender(Transaction[ ...
•    - function executeBySelf(Transaction[] ...
•    - function executeCall(address to, uint ...
•    - function isValidSignature(bytes32 has ...
•    - function supportsInterface(bytes4 int ...
• interface IERC20
•    - function totalSupply()
•    - function balanceOf(address account)
•    - function transfer(address recipient, ...
•    - function allowance(address owner, add ...
•    - function approve(address spender, uin ...
•    - function transferFrom(address sender, ...
•  contract IdentityFactory *
•    - function deploy(bytes calldata code, ...
•    - function deployAndExecute(
•    - function deployAndCall(bytes calldata ...
•    - function withdraw(IERC20 token, addre ...
•    - function deploySafe(bytes memory code ...

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/**
 *Submitted for verification at Etherscan.io on 2021-11-14
*/

// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.8.7;

// @TODO: Formatting
library LibBytes {
  // @TODO: see if we can just set .length = 
  function trimToSize(bytes memory b, uint newLen)
    internal
    pure
  {
    require(b.length > newLen, "BytesLib: only shrinking");
    assembly {
      mstore(b, newLen)
    }
  }


  /***********************************|
  |        Read Bytes Functions       |
  |__________________________________*/

  /**
   * @dev Reads a bytes32 value from a position in a byte array.
   * @param b Byte array containing a bytes32 value.
   * @param index Index in byte array of bytes32 value.
   * @return result bytes32 value from byte array.
   */
  function readBytes32(
    bytes memory b,
    uint256 index
  )
    internal
    pure
    returns (bytes32 result)
  {
    // Arrays are prefixed by a 256 bit length parameter
    index += 32;

    require(b.length >= index, "BytesLib: length");

    // Read the bytes32 from array memory
    assembly {
      result := mload(add(b, index))
    }
    return result;
  }
}



interface IERC1271Wallet {
	function isValidSignature(bytes32 hash, bytes calldata signature) external view returns (bytes4 magicValue);
}

library SignatureValidator {
	using LibBytes for bytes;

	enum SignatureMode {
		EIP712,
		EthSign,
		SmartWallet,
		Spoof
	}

	// bytes4(keccak256("isValidSignature(bytes32,bytes)"))
	bytes4 constant internal ERC1271_MAGICVALUE_BYTES32 = 0x1626ba7e;

	function recoverAddr(bytes32 hash, bytes memory sig) internal view returns (address) {
		return recoverAddrImpl(hash, sig, false);
	}

	function recoverAddrImpl(bytes32 hash, bytes memory sig, bool allowSpoofing) internal view returns (address) {
		require(sig.length >= 1, "SV_SIGLEN");
		uint8 modeRaw;
		unchecked { modeRaw = uint8(sig[sig.length - 1]); }
		SignatureMode mode = SignatureMode(modeRaw);

		// {r}{s}{v}{mode}
		if (mode == SignatureMode.EIP712 || mode == SignatureMode.EthSign) {
			require(sig.length == 66, "SV_LEN");
			bytes32 r = sig.readBytes32(0);
			bytes32 s = sig.readBytes32(32);
			uint8 v = uint8(sig[64]);
			// Hesitant about this check: seems like this is something that has no business being checked on-chain
			require(v == 27 || v == 28, "SV_INVALID_V");
			if (mode == SignatureMode.EthSign) hash = keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
			address signer = ecrecover(hash, v, r, s);
			require(signer != address(0), "SV_ZERO_SIG");
			return signer;
		// {sig}{verifier}{mode}
		} else if (mode == SignatureMode.SmartWallet) {
			// 32 bytes for the addr, 1 byte for the type = 33
			require(sig.length > 33, "SV_LEN_WALLET");
			uint newLen;
			unchecked {
				newLen = sig.length - 33;
			}
			IERC1271Wallet wallet = IERC1271Wallet(address(uint160(uint256(sig.readBytes32(newLen)))));
			sig.trimToSize(newLen);
			require(ERC1271_MAGICVALUE_BYTES32 == wallet.isValidSignature(hash, sig), "SV_WALLET_INVALID");
			return address(wallet);
		// {address}{mode}; the spoof mode is used when simulating calls
		} else if (mode == SignatureMode.Spoof && allowSpoofing) {
			require(tx.origin == address(1), "SV_SPOOF_ORIGIN");
			require(sig.length == 33, "SV_SPOOF_LEN");
			sig.trimToSize(32);
			return abi.decode(sig, (address));
		} else revert("SV_SIGMODE");
	}
}


contract Identity {
	mapping (address => bytes32) public privileges;
	// The next allowed nonce
	uint public nonce;

	// Events
	event LogPrivilegeChanged(address indexed addr, bytes32 priv);
	event LogErr(address indexed to, uint value, bytes data, bytes returnData); // only used in tryCatch

	// Transaction structure
	// we handle replay protection separately by requiring (address(this), chainID, nonce) as part of the sig
	struct Transaction {
		address to;
		uint value;
		bytes data;
	}

	constructor(address[] memory addrs) {
		uint len = addrs.length;
		for (uint i=0; i<len; i++) {
			// @TODO should we allow setting to any arb value here?
			privileges[addrs[i]] = bytes32(uint(1));
			emit LogPrivilegeChanged(addrs[i], bytes32(uint(1)));
		}
	}

	// This contract can accept ETH without calldata
	receive() external payable {}

	// This contract can accept ETH with calldata
	// However, to support EIP 721 and EIP 1155, we need to respond to those methods with their own method signature
	fallback() external payable {
		bytes4 method = msg.sig;
		if (
			method == 0x150b7a02 // bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))
				|| method == 0xf23a6e61 // bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))
				|| method == 0xbc197c81 // bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))
		) {
			// Copy back the method
			// solhint-disable-next-line no-inline-assembly
			assembly {
				calldatacopy(0, 0, 0x04)
				return (0, 0x20)
			}
		}
	}

	function setAddrPrivilege(address addr, bytes32 priv)
		external
	{
		require(msg.sender == address(this), 'ONLY_IDENTITY_CAN_CALL');
		// Anti-bricking measure: if the privileges slot is used for special data (not 0x01),
		// don't allow to set it to true
		if (uint(privileges[addr]) > 1) require(priv != bytes32(uint(1)), 'UNSETTING_SPECIAL_DATA');
		privileges[addr] = priv;
		emit LogPrivilegeChanged(addr, priv);
	}

	function tipMiner(uint amount)
		external
	{
		require(msg.sender == address(this), 'ONLY_IDENTITY_CAN_CALL');
		// See https://docs.flashbots.net/flashbots-auction/searchers/advanced/coinbase-payment/#managing-payments-to-coinbaseaddress-when-it-is-a-contract
		// generally this contract is reentrancy proof cause of the nonce
		executeCall(block.coinbase, amount, new bytes(0));
	}

	function tryCatch(address to, uint value, bytes calldata data)
		external
	{
		require(msg.sender == address(this), 'ONLY_IDENTITY_CAN_CALL');
		(bool success, bytes memory returnData) = to.call{value: value, gas: gasleft()}(data);
		if (!success) emit LogErr(to, value, data, returnData);
	}


	// WARNING: if the signature of this is changed, we have to change IdentityFactory
	function execute(Transaction[] calldata txns, bytes calldata signature)
		external
	{
		require(txns.length > 0, 'MUST_PASS_TX');
		uint currentNonce = nonce;
		// NOTE: abi.encode is safer than abi.encodePacked in terms of collision safety
		bytes32 hash = keccak256(abi.encode(address(this), block.chainid, currentNonce, txns));
		// We have to increment before execution cause it protects from reentrancies
		nonce = currentNonce + 1;

		address signer = SignatureValidator.recoverAddrImpl(hash, signature, true);
		require(privileges[signer] != bytes32(0), 'INSUFFICIENT_PRIVILEGE');
		uint len = txns.length;
		for (uint i=0; i<len; i++) {
			Transaction memory txn = txns[i];
			executeCall(txn.to, txn.value, txn.data);
		}
		// The actual anti-bricking mechanism - do not allow a signer to drop their own priviledges
		require(privileges[signer] != bytes32(0), 'PRIVILEGE_NOT_DOWNGRADED');
	}

	// no need for nonce management here cause we're not dealing with sigs
	function executeBySender(Transaction[] calldata txns) external {
		require(txns.length > 0, 'MUST_PASS_TX');
		require(privileges[msg.sender] != bytes32(0), 'INSUFFICIENT_PRIVILEGE');
		uint len = txns.length;
		for (uint i=0; i<len; i++) {
			Transaction memory txn = txns[i];
			executeCall(txn.to, txn.value, txn.data);
		}
		// again, anti-bricking
		require(privileges[msg.sender] != bytes32(0), 'PRIVILEGE_NOT_DOWNGRADED');
	}

	function executeBySelf(Transaction[] calldata txns) external {
		require(msg.sender == address(this), 'ONLY_IDENTITY_CAN_CALL');
		require(txns.length > 0, 'MUST_PASS_TX');
		uint len = txns.length;
		for (uint i=0; i<len; i++) {
			Transaction memory txn = txns[i];
			executeCall(txn.to, txn.value, txn.data);
		}
	}

	// we shouldn't use address.call(), cause: https://github.com/ethereum/solidity/issues/2884
	// copied from https://github.com/uport-project/uport-identity/blob/develop/contracts/Proxy.sol
	// there's also
	// https://github.com/gnosis/MultiSigWallet/commit/e1b25e8632ca28e9e9e09c81bd20bf33fdb405ce
	// https://github.com/austintgriffith/bouncer-proxy/blob/master/BouncerProxy/BouncerProxy.sol
	// https://github.com/gnosis/safe-contracts/blob/7e2eeb3328bb2ae85c36bc11ea6afc14baeb663c/contracts/base/Executor.sol
	function executeCall(address to, uint256 value, bytes memory data)
		internal
	{
		assembly {
			let result := call(gas(), to, value, add(data, 0x20), mload(data), 0, 0)

			switch result case 0 {
				let size := returndatasize()
				let ptr := mload(0x40)
				returndatacopy(ptr, 0, size)
				revert(ptr, size)
			}
			default {}
		}
		// A single call consumes around 477 more gas with the pure solidity version, for whatever reason
		// WARNING: do not use this, it corrupts the returnData string (returns it in a slightly different format)
		//(bool success, bytes memory returnData) = to.call{value: value, gas: gasleft()}(data);
		//if (!success) revert(string(data));
	}

	// EIP 1271 implementation
	// see https://eips.ethereum.org/EIPS/eip-1271
	function isValidSignature(bytes32 hash, bytes calldata signature) external view returns (bytes4) {
		if (privileges[SignatureValidator.recoverAddr(hash, signature)] != bytes32(0)) {
			// bytes4(keccak256("isValidSignature(bytes32,bytes)")
			return 0x1626ba7e;
		} else {
			return 0xffffffff;
		}
	}

	// EIP 1155 implementation
	// we pretty much only need to signal that we support the interface for 165, but for 1155 we also need the fallback function
	function supportsInterface(bytes4 interfaceID) external pure returns (bool) {
		return
			interfaceID == 0x01ffc9a7 ||    // ERC-165 support (i.e. `bytes4(keccak256('supportsInterface(bytes4)'))`).
			interfaceID == 0x4e2312e0;      // ERC-1155 `ERC1155TokenReceiver` support (i.e. `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)")) ^ bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))`).
	}
}

interface IERC20 {
    function totalSupply() external view returns (uint256);
    function balanceOf(address account) external view returns (uint256);
    function transfer(address recipient, uint256 amount) external returns (bool);
    function allowance(address owner, address spender) external view returns (uint256);
    function approve(address spender, uint256 amount) external returns (bool);
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
}


contract IdentityFactory {
	event LogDeployed(address addr, uint256 salt);

	address public immutable allowedToDrain;
	constructor(address allowed) {
		allowedToDrain = allowed;
	}

	function deploy(bytes calldata code, uint256 salt) external {
		deploySafe(code, salt);
	}

	// When the relayer needs to act upon an /identity/:addr/submit call, it'll either call execute on the Identity directly
	// if it's already deployed, or call `deployAndExecute` if the account is still counterfactual
	// we can't have deployAndExecuteBySender, because the sender will be the factory
	function deployAndExecute(
		bytes calldata code, uint256 salt,
		Identity.Transaction[] calldata txns, bytes calldata signature
	) external {
		address payable addr = payable(deploySafe(code, salt));
		Identity(addr).execute(txns, signature);
	}
	// but for the quick accounts we need this
	function deployAndCall(bytes calldata code, uint256 salt, address callee, bytes calldata data) external {
		deploySafe(code, salt);
		require(data.length > 4, 'DATA_LEN');
		bytes4 method;
		// solium-disable-next-line security/no-inline-assembly
		assembly {
			// can also do shl(224, shr(224, calldataload(0)))
			method := and(calldataload(data.offset), 0xffffffff00000000000000000000000000000000000000000000000000000000)
		}
		require(
			method == 0x6171d1c9 // execute((address,uint256,bytes)[],bytes)
			|| method == 0x534255ff // send(address,(uint256,address,address),(bool,bytes,bytes),(address,uint256,bytes)[])
			|| method == 0x4b776c6d // sendTransfer(address,(uint256,address,address),(bytes,bytes),(address,address,uint256,uint256))
			|| method == 0x63486689 // sendTxns(address,(uint256,address,address),(bytes,bytes),(string,address,uint256,bytes)[])
		, 'INVALID_METHOD');

		assembly {
			let dataPtr := mload(0x40)
			calldatacopy(dataPtr, data.offset, data.length)
			let result := call(gas(), callee, 0, dataPtr, data.length, 0, 0)

			switch result case 0 {
				let size := returndatasize()
				let ptr := mload(0x40)
				returndatacopy(ptr, 0, size)
				revert(ptr, size)
			}
			default {}
		}
	}


	// Withdraw the earnings from various fees (deploy fees and execute fees earned cause of `deployAndExecute`)
	// although we do not use this since we no longer receive fees on the factory, it's good to have this for safety
	// In practice, we (almost) never receive fees on the factory, but there's one exception: QuickAccManager EIP 712 methods (sendTransfer) + deployAndCall
	function withdraw(IERC20 token, address to, uint256 tokenAmount) external {
		require(msg.sender == allowedToDrain, 'ONLY_AUTHORIZED');
		token.transfer(to, tokenAmount);
	}

	// This is done to mitigate possible frontruns where, for example, deploying the same code/salt via deploy()
	// would make a pending deployAndExecute fail
	// The way we mitigate that is by checking if the contract is already deployed and if so, we continue execution
	function deploySafe(bytes memory code, uint256 salt) internal returns (address) {
		address expectedAddr = address(uint160(uint256(
			keccak256(abi.encodePacked(bytes1(0xff), address(this), salt, keccak256(code)))
		)));
		uint size;
		assembly { size := extcodesize(expectedAddr) }
		// If there is code at that address, we can assume it's the one we were about to deploy,
		// because of how CREATE2 and keccak256 works
		if (size == 0) {
			address addr;
			assembly { addr := create2(0, add(code, 0x20), mload(code), salt) }
			require(addr != address(0), 'FAILED_DEPLOYING');
			require(addr == expectedAddr, 'FAILED_MATCH');
			emit LogDeployed(addr, salt);
		}
		return expectedAddr;
	}
}

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[{"inputs":[{"internalType":"address","name":"allowed","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"addr","type":"address"},{"indexed":false,"internalType":"uint256","name":"salt","type":"uint256"}],"name":"LogDeployed","type":"event"},{"inputs":[],"name":"allowedToDrain","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes","name":"code","type":"bytes"},{"internalType":"uint256","name":"salt","type":"uint256"}],"name":"deploy","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes","name":"code","type":"bytes"},{"internalType":"uint256","name":"salt","type":"uint256"},{"internalType":"address","name":"callee","type":"address"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"deployAndCall","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes","name":"code","type":"bytes"},{"internalType":"uint256","name":"salt","type":"uint256"},{"components":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"internalType":"struct Identity.Transaction[]","name":"txns","type":"tuple[]"},{"internalType":"bytes","name":"signature","type":"bytes"}],"name":"deployAndExecute","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract IERC20","name":"token","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenAmount","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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00000000000000000000000023c2c34f38ce66ccc10e71e9bb2a06532d52c5e9

-----Decoded View---------------
Arg [0] : allowed (address): 0x23C2c34f38ce66ccC10E71e9bB2A06532D52C5E9

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 00000000000000000000000023c2c34f38ce66ccc10e71e9bb2a06532d52c5e9

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