false
false
5713000

Contract Address Details

0x4e1DCf7AD4e460CfD30791CCC4F9c8a4f820ec67

Contract Name
SafeProxyFactory
Creator
0x914d7f–5643d7 at 0xa2c2da–8adc7e
Balance
0 FX
Tokens
Fetching tokens...
Transactions
3 Transactions
Transfers
0 Transfers
Gas Used
823,427
Last Balance Update
19148135
Warning! Contract bytecode has been changed and doesn't match the verified one. Therefore, interaction with this smart contract may be risky.
Contract name:
SafeProxyFactory




Optimization enabled
false
Compiler version
v0.7.6+commit.7338295f




EVM Version
default




Verified at
2024-06-26T04:09:12.230178Z

contracts/proxies/SafeProxyFactory.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
import "./SafeProxy.sol";
import "./IProxyCreationCallback.sol";
/**
* @title Proxy Factory - Allows to create a new proxy contract and execute a message call to the new proxy within one transaction.
* @author Stefan George - @Georgi87
*/
contract SafeProxyFactory {
event ProxyCreation(SafeProxy indexed proxy, address singleton);
/// @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(SafeProxy).creationCode;
}
/**
* @notice Internal method to create a new proxy contract using CREATE2. Optionally executes an initializer call to a new proxy.
* @param _singleton Address of singleton contract. Must be deployed at the time of execution.
* @param initializer (Optional) Payload for a message call to be sent to a new proxy contract.
* @param salt Create2 salt to use for calculating the address of the new proxy contract.
* @return proxy Address of the new proxy contract.
*/
function deployProxy(address _singleton, bytes memory initializer, bytes32 salt) internal returns (SafeProxy proxy) {
require(isContract(_singleton), "Singleton contract not deployed");
bytes memory deploymentData = abi.encodePacked(type(SafeProxy).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");
if (initializer.length > 0) {
// solhint-disable-next-line no-inline-assembly
assembly {
if eq(call(gas(), proxy, 0, add(initializer, 0x20), mload(initializer), 0, 0), 0) {
revert(0, 0)
}
 
 
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@openzeppelin/contracts/utils/Context.sol

// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/*
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with GSN meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address payable) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes memory) {
this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
return msg.data;
}
}
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contracts/interfaces/ISignatureValidator.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
contract ISignatureValidatorConstants {
// bytes4(keccak256("isValidSignature(bytes,bytes)")
bytes4 internal constant EIP1271_MAGIC_VALUE = 0x20c13b0b;
}
abstract contract ISignatureValidator is ISignatureValidatorConstants {
/**
* @notice Legacy EIP1271 method to validate a signature.
* @param _data Arbitrary length data signed on the behalf of address(this).
* @param _signature Signature byte array associated with _data.
*
* MUST return the bytes4 magic value 0x20c13b0b when function passes.
* MUST NOT modify state (using STATICCALL for solc < 0.5, view modifier for solc > 0.5)
* MUST allow external calls
*/
function isValidSignature(bytes memory _data, bytes memory _signature) public view virtual returns (bytes4);
}
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contracts/test/TestHandler.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
import "../handler/HandlerContext.sol";
/**
* @title TestHandler - A test FallbackHandler contract
*/
contract TestHandler is HandlerContext {
/**
* @notice Returns the sender and manager address provided by the HandlerContext
* @return sender The sender address
* @return manager The manager address
*/
function dudududu() external view returns (address sender, address manager) {
return (_msgSender(), _manager());
}
}
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contracts/libraries/MultiSendCallOnly.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
/**
* @title Multi Send Call Only - Allows to batch multiple transactions into one, but only calls
* @notice The guard logic is not required here as this contract doesn't support nested delegate calls
* @author Stefan George - @Georgi87
* @author Richard Meissner - @rmeissner
*/
contract MultiSendCallOnly {
/**
* @dev Sends multiple transactions and reverts all if one fails.
* @param transactions Encoded transactions. Each transaction is encoded as a packed bytes of
* operation has to be uint8(0) in this version (=> 1 byte),
* to as a address (=> 20 bytes),
* value as a uint256 (=> 32 bytes),
* data length as a uint256 (=> 32 bytes),
* data as bytes.
* see abi.encodePacked for more information on packed encoding
* @notice The code is for most part the same as the normal MultiSend (to keep compatibility),
* but reverts if a transaction tries to use a delegatecall.
* @notice This method is payable as delegatecalls keep the msg.value from the previous call
* If the calling method (e.g. execTransaction) received ETH this would revert otherwise
*/
function multiSend(bytes memory transactions) public payable {
// solhint-disable-next-line no-inline-assembly
assembly {
let length := mload(transactions)
let i := 0x20
for {
// Pre block is not used in "while mode"
} lt(i, length) {
// Post block is not used in "while mode"
} {
// First byte of the data is the operation.
// We shift by 248 bits (256 - 8 [operation byte]) it right since mload will always load 32 bytes (a word).
// This will also zero out unused data.
let operation := shr(0xf8, mload(add(transactions, i)))
// We offset the load address by 1 byte (operation byte)
// We shift it right by 96 bits (256 - 160 [20 address bytes]) to right-align the data and zero out unused data.
let to := shr(0x60, mload(add(transactions, add(i, 0x01))))
 
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contracts/proxies/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 - <stefan@gnosis.io>
* @author Richard Meissner - <richard@gnosis.io>
*/
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())
 
 
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contracts/common/SignatureDecoder.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
/**
* @title SignatureDecoder - Decodes signatures encoded as bytes
* @author Richard Meissner - @rmeissner
*/
abstract contract SignatureDecoder {
/**
* @notice Splits signature bytes into `uint8 v, bytes32 r, bytes32 s`.
* @dev Make sure to perform a bounds check for @param pos, to avoid out of bounds access on @param signatures
* The signature format is a compact form of {bytes32 r}{bytes32 s}{uint8 v}
* Compact means uint8 is not padded to 32 bytes.
* @param pos Which signature to read.
* A prior bounds check of this parameter should be performed, to avoid out of bounds access.
* @param signatures Concatenated {r, s, v} signatures.
* @return v Recovery ID or Safe signature type.
* @return r Output value r of the signature.
* @return s Output value s of the signature.
*/
function signatureSplit(bytes memory signatures, uint256 pos) internal pure returns (uint8 v, bytes32 r, bytes32 s) {
// solhint-disable-next-line no-inline-assembly
assembly {
let signaturePos := mul(0x41, pos)
r := mload(add(signatures, add(signaturePos, 0x20)))
s := mload(add(signatures, add(signaturePos, 0x40)))
/**
* Here we are loading the last 32 bytes, including 31 bytes
* of 's'. There is no 'mload8' to do this.
* 'byte' is not working due to the Solidity parser, so lets
* use the second best option, 'and'
*/
v := and(mload(add(signatures, add(signaturePos, 0x41))), 0xff)
}
}
}
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contracts/libraries/SignMessageLib.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
import "./SafeStorage.sol";
import "../Safe.sol";
/**
* @title SignMessageLib - Allows to sign messages on-chain by writing the signed message hashes on-chain.
* @author Richard Meissner - @rmeissner
*/
contract SignMessageLib is SafeStorage {
// keccak256("SafeMessage(bytes message)");
bytes32 private constant SAFE_MSG_TYPEHASH = 0x60b3cbf8b4a223d68d641b3b6ddf9a298e7f33710cf3d3a9d1146b5a6150fbca;
event SignMsg(bytes32 indexed msgHash);
/**
* @notice Marks a message (`_data`) as signed.
* @dev Can be verified using EIP-1271 validation method by passing the pre-image of the message hash and empty bytes as the signature.
* @param _data Arbitrary length data that should be marked as signed on the behalf of address(this).
*/
function signMessage(bytes calldata _data) external {
bytes32 msgHash = getMessageHash(_data);
signedMessages[msgHash] = 1;
emit SignMsg(msgHash);
}
/**
* @dev Returns hash of a message that can be signed by owners.
* @param message Message that should be hashed.
* @return Message hash.
*/
function getMessageHash(bytes memory message) public view returns (bytes32) {
bytes32 safeMessageHash = keccak256(abi.encode(SAFE_MSG_TYPEHASH, keccak256(message)));
return keccak256(abi.encodePacked(bytes1(0x19), bytes1(0x01), Safe(payable(address(this))).domainSeparator(), safeMessageHash));
}
}
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contracts/interfaces/ERC777TokensRecipient.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
/**
* @title ERC777TokensRecipient
* @dev Interface for contracts that will be called with the ERC777 token's `tokensReceived` method.
* The contract receiving the tokens must implement this interface in order to receive the tokens.
*/
interface ERC777TokensRecipient {
/**
* @dev Called by the ERC777 token contract after a successful transfer or a minting operation.
* @param operator The address of the operator performing the transfer or minting operation.
* @param from The address of the sender.
* @param to The address of the recipient.
* @param amount The amount of tokens that were transferred or minted.
* @param data Additional data that was passed during the transfer or minting operation.
* @param operatorData Additional data that was passed by the operator during the transfer or minting operation.
*/
function tokensReceived(
address operator,
address from,
address to,
uint256 amount,
bytes calldata data,
bytes calldata operatorData
) external;
}
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contracts/examples/guards/DebugTransactionGuard.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
import "../../common/Enum.sol";
import "../../base/GuardManager.sol";
import "../../Safe.sol";
/**
* @title Debug Transaction Guard - Emits transaction events with extended information.
* @dev This guard is only meant as a development tool and example
* @author Richard Meissner - @rmeissner
*/
contract DebugTransactionGuard is BaseGuard {
// solhint-disable-next-line payable-fallback
fallback() external {
// We don't revert on fallback to avoid issues in case of a Safe upgrade
// E.g. The expected check method might change and then the Safe would be locked.
}
event TransactionDetails(
address indexed safe,
bytes32 indexed txHash,
address to,
uint256 value,
bytes data,
Enum.Operation operation,
uint256 safeTxGas,
bool usesRefund,
uint256 nonce,
bytes signatures,
address executor
);
event GasUsage(address indexed safe, bytes32 indexed txHash, uint256 indexed nonce, bool success);
mapping(bytes32 => uint256) public txNonces;
/**
* @notice Called by the Safe contract before a transaction is executed.
* @param to Destination address of Safe transaction.
* @param value Ether value of Safe transaction.
 
 
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contracts/proxies/IProxyCreationCallback.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
import "./SafeProxy.sol";
/**
* @title IProxyCreationCallback
* @dev An interface for a contract that implements a callback function to be executed after the creation of a proxy instance.
*/
interface IProxyCreationCallback {
/**
* @dev Function to be called after the creation of a SafeProxy instance.
* @param proxy The newly created SafeProxy instance.
* @param _singleton The address of the singleton contract used to create the proxy.
* @param initializer The initializer function call data.
* @param saltNonce The nonce used to generate the salt for the proxy deployment.
*/
function proxyCreated(SafeProxy proxy, address _singleton, bytes calldata initializer, uint256 saltNonce) external;
}
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contracts/handler/CompatibilityFallbackHandler.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
import "./TokenCallbackHandler.sol";
import "../interfaces/ISignatureValidator.sol";
import "../Safe.sol";
/**
* @title Compatibility Fallback Handler - Provides compatibility between pre 1.3.0 and 1.3.0+ Safe contracts.
* @author Richard Meissner - @rmeissner
*/
contract CompatibilityFallbackHandler is TokenCallbackHandler, ISignatureValidator {
// keccak256("SafeMessage(bytes message)");
bytes32 private constant SAFE_MSG_TYPEHASH = 0x60b3cbf8b4a223d68d641b3b6ddf9a298e7f33710cf3d3a9d1146b5a6150fbca;
bytes4 internal constant SIMULATE_SELECTOR = bytes4(keccak256("simulate(address,bytes)"));
address internal constant SENTINEL_MODULES = address(0x1);
bytes4 internal constant UPDATED_MAGIC_VALUE = 0x1626ba7e;
/**
* @notice Legacy EIP-1271 signature validation method.
* @dev Implementation of ISignatureValidator (see `interfaces/ISignatureValidator.sol`)
* @param _data Arbitrary length data signed on the behalf of address(msg.sender).
* @param _signature Signature byte array associated with _data.
* @return The EIP-1271 magic value.
*/
function isValidSignature(bytes memory _data, bytes memory _signature) public view override returns (bytes4) {
// Caller should be a Safe
Safe safe = Safe(payable(msg.sender));
bytes memory messageData = encodeMessageDataForSafe(safe, _data);
bytes32 messageHash = keccak256(messageData);
if (_signature.length == 0) {
require(safe.signedMessages(messageHash) != 0, "Hash not approved");
} else {
safe.checkSignatures(messageHash, messageData, _signature);
}
return EIP1271_MAGIC_VALUE;
}
/**
 
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contracts/handler/HandlerContext.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
/**
* @title Handler Context - Allows the fallback handler to extract addition context from the calldata
* @dev The fallback manager appends the following context to the calldata:
* 1. Fallback manager caller address (non-padded)
* based on https://github.com/OpenZeppelin/openzeppelin-contracts/blob/f8cc8b844a9f92f63dc55aa581f7d643a1bc5ac1/contracts/metatx/ERC2771Context.sol
* @author Richard Meissner - @rmeissner
*/
abstract contract HandlerContext {
/**
* @notice Allows fetching the original caller address.
* @dev This is only reliable in combination with a FallbackManager that supports this (e.g. Safe contract >=1.3.0).
* When using this functionality make sure that the linked _manager (aka msg.sender) supports this.
* This function does not rely on a trusted forwarder. Use the returned value only to
* check information against the calling manager.
* @return sender Original caller address.
*/
function _msgSender() internal pure returns (address sender) {
// The assembly code is more direct than the Solidity version using `abi.decode`.
// solhint-disable-next-line no-inline-assembly
assembly {
sender := shr(96, calldataload(sub(calldatasize(), 20)))
}
}
/**
* @notice Returns the FallbackManager address
* @return Fallback manager address
*/
function _manager() internal view returns (address) {
return msg.sender;
}
}
 
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contracts/handler/TokenCallbackHandler.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
import "../interfaces/ERC1155TokenReceiver.sol";
import "../interfaces/ERC721TokenReceiver.sol";
import "../interfaces/ERC777TokensRecipient.sol";
import "../interfaces/IERC165.sol";
/**
* @title Default Callback Handler - Handles supported tokens' callbacks, allowing Safes receiving these tokens.
* @author Richard Meissner - @rmeissner
*/
contract TokenCallbackHandler is ERC1155TokenReceiver, ERC777TokensRecipient, ERC721TokenReceiver, IERC165 {
/**
* @notice Handles ERC1155 Token callback.
* return Standardized onERC1155Received return value.
*/
function onERC1155Received(address, address, uint256, uint256, bytes calldata) external pure override returns (bytes4) {
return 0xf23a6e61;
}
/**
* @notice Handles ERC1155 Token batch callback.
* return Standardized onERC1155BatchReceived return value.
*/
function onERC1155BatchReceived(
address,
address,
uint256[] calldata,
uint256[] calldata,
bytes calldata
) external pure override returns (bytes4) {
return 0xbc197c81;
}
/**
* @notice Handles ERC721 Token callback.
* return Standardized onERC721Received return value.
*/
function onERC721Received(address, address, uint256, bytes calldata) external pure override returns (bytes4) {
return 0x150b7a02;
 
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contracts/common/SelfAuthorized.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
/**
* @title SelfAuthorized - Authorizes current contract to perform actions to itself.
* @author Richard Meissner - @rmeissner
*/
abstract contract SelfAuthorized {
function requireSelfCall() private view {
require(msg.sender == address(this), "GS031");
}
modifier authorized() {
// Modifiers are copied around during compilation. This is a function call as it minimized the bytecode size
requireSelfCall();
_;
}
}
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contracts/examples/libraries/Migrate_1_3_0_to_1_2_0.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
import "../../libraries/SafeStorage.sol";
/**
* @title Migration - Migrates a Safe contract from 1.3.0 to 1.2.0
* @author Richard Meissner - @rmeissner
*/
contract Migration is SafeStorage {
bytes32 private constant DOMAIN_SEPARATOR_TYPEHASH = 0x035aff83d86937d35b32e04f0ddc6ff469290eef2f1b692d8a815c89404d4749;
address public immutable migrationSingleton;
address public immutable safe120Singleton;
constructor(address targetSingleton) {
// Singleton address cannot be zero address.
require(targetSingleton != address(0), "Invalid singleton address provided");
safe120Singleton = targetSingleton;
migrationSingleton = address(this);
}
event ChangedMasterCopy(address singleton);
/**
* @notice Migrates the Safe to the Singleton contract at `migrationSingleton`.
* @dev This can only be called via a delegatecall.
*/
function migrate() public {
require(address(this) != migrationSingleton, "Migration should only be called via delegatecall");
singleton = safe120Singleton;
_deprecatedDomainSeparator = keccak256(abi.encode(DOMAIN_SEPARATOR_TYPEHASH, this));
emit ChangedMasterCopy(singleton);
}
}
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contracts/common/SecuredTokenTransfer.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
/**
* @title SecuredTokenTransfer - Secure token transfer.
* @author Richard Meissner - @rmeissner
*/
abstract contract SecuredTokenTransfer {
/**
* @notice Transfers a token and returns a boolean if it was a success
* @dev It checks the return data of the transfer call and returns true if the transfer was successful.
* It doesn't check if the `token` address is a contract or not.
* @param token Token that should be transferred
* @param receiver Receiver to whom the token should be transferred
* @param amount The amount of tokens that should be transferred
* @return transferred Returns true if the transfer was successful
*/
function transferToken(address token, address receiver, uint256 amount) internal returns (bool transferred) {
// 0xa9059cbb - keccack("transfer(address,uint256)")
bytes memory data = abi.encodeWithSelector(0xa9059cbb, receiver, amount);
// solhint-disable-next-line no-inline-assembly
assembly {
// We write the return value to scratch space.
// See https://docs.soliditylang.org/en/v0.7.6/internals/layout_in_memory.html#layout-in-memory
let success := call(sub(gas(), 10000), token, 0, add(data, 0x20), mload(data), 0, 0x20)
switch returndatasize()
case 0 {
transferred := success
}
case 0x20 {
transferred := iszero(or(iszero(success), iszero(mload(0))))
}
default {
transferred := 0
}
}
}
}
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contracts/SafeL2.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
import "./Safe.sol";
/**
* @title SafeL2 - An implementation of the Safe contract that emits additional events on transaction executions.
* @notice For a more complete description of the Safe contract, please refer to the main Safe contract `Safe.sol`.
* @author Stefan George - @Georgi87
* @author Richard Meissner - @rmeissner
*/
contract SafeL2 is Safe {
event SafeMultiSigTransaction(
address to,
uint256 value,
bytes data,
Enum.Operation operation,
uint256 safeTxGas,
uint256 baseGas,
uint256 gasPrice,
address gasToken,
address payable refundReceiver,
bytes signatures,
// We combine nonce, sender and threshold into one to avoid stack too deep
// Dev note: additionalInfo should not contain `bytes`, as this complicates decoding
bytes additionalInfo
);
event SafeModuleTransaction(address module, address to, uint256 value, bytes data, Enum.Operation operation);
// @inheritdoc Safe
function execTransaction(
address to,
uint256 value,
bytes calldata data,
Enum.Operation operation,
uint256 safeTxGas,
uint256 baseGas,
uint256 gasPrice,
address gasToken,
address payable refundReceiver,
 
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contracts/Safe.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
import "./base/ModuleManager.sol";
import "./base/OwnerManager.sol";
import "./base/FallbackManager.sol";
import "./base/GuardManager.sol";
import "./common/NativeCurrencyPaymentFallback.sol";
import "./common/Singleton.sol";
import "./common/SignatureDecoder.sol";
import "./common/SecuredTokenTransfer.sol";
import "./common/StorageAccessible.sol";
import "./interfaces/ISignatureValidator.sol";
import "./external/SafeMath.sol";
/**
* @title Safe - A multisignature wallet with support for confirmations using signed messages based on EIP-712.
* @dev Most important concepts:
* - Threshold: Number of required confirmations for a Safe transaction.
* - Owners: List of addresses that control the Safe. They are the only ones that can add/remove owners, change the threshold and
* approve transactions. Managed in `OwnerManager`.
* - Transaction Hash: Hash of a transaction is calculated using the EIP-712 typed structured data hashing scheme.
* - Nonce: Each transaction should have a different nonce to prevent replay attacks.
* - Signature: A valid signature of an owner of the Safe for a transaction hash.
* - Guard: Guard is a contract that can execute pre- and post- transaction checks. Managed in `GuardManager`.
* - Modules: Modules are contracts that can be used to extend the write functionality of a Safe. Managed in `ModuleManager`.
* - Fallback: Fallback handler is a contract that can provide additional read-only functional for Safe. Managed in `FallbackManager`.
* Note: This version of the implementation contract doesn't emit events for the sake of gas efficiency and therefore requires a tracing node for indexing/
* For the events-based implementation see `SafeL2.sol`.
* @author Stefan George - @Georgi87
* @author Richard Meissner - @rmeissner
*/
contract Safe is
Singleton,
NativeCurrencyPaymentFallback,
ModuleManager,
OwnerManager,
SignatureDecoder,
SecuredTokenTransfer,
ISignatureValidatorConstants,
FallbackManager,
 
 
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contracts/accessors/SimulateTxAccessor.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
import "../base/Executor.sol";
/**
* @title Simulate Transaction Accessor.
* @notice Can be used with StorageAccessible to simulate Safe transactions.
* @author Richard Meissner - @rmeissner
*/
contract SimulateTxAccessor is Executor {
address private immutable accessorSingleton;
constructor() {
accessorSingleton = address(this);
}
/**
* @notice Modifier to make a function callable via delegatecall only.
* If the function is called via a regular call, it will revert.
*/
modifier onlyDelegateCall() {
require(address(this) != accessorSingleton, "SimulateTxAccessor should only be called via delegatecall");
_;
}
/**
* @notice Simulates a Safe transaction and returns the used gas, success boolean and the return data.
* @dev Executes the specified operation {Call, DelegateCall} and returns operation-specific data.
* Has to be called via delegatecall.
* This returns the data equal to `abi.encode(uint256(etimate), bool(success), bytes(returnData))`.
* Specifically, the returndata will be:
* `estimate:uint256 || success:bool || returnData.length:uint256 || returnData:bytes`.
* @param to Destination address .
* @param value Native token value.
* @param data Data payload.
* @param operation Operation type {Call, DelegateCall}.
* @return estimate Gas used.
* @return success Success boolean value.
* @return returnData Return data.
*/
 
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contracts/base/Executor.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
import "../common/Enum.sol";
/**
* @title Executor - A contract that can execute transactions
* @author Richard Meissner - @rmeissner
*/
abstract contract Executor {
/**
* @notice Executes either a delegatecall or a call with provided parameters.
* @dev This method doesn't perform any sanity check of the transaction, such as:
* - if the contract at `to` address has code or not
* It is the responsibility of the caller to perform such checks.
* @param to Destination address.
* @param value Ether value.
* @param data Data payload.
* @param operation Operation type.
* @return success boolean flag indicating if the call succeeded.
*/
function execute(
address to,
uint256 value,
bytes memory data,
Enum.Operation operation,
uint256 txGas
) internal returns (bool success) {
if (operation == Enum.Operation.DelegateCall) {
// solhint-disable-next-line no-inline-assembly
assembly {
success := delegatecall(txGas, to, add(data, 0x20), mload(data), 0, 0)
}
} else {
// solhint-disable-next-line no-inline-assembly
assembly {
success := call(txGas, to, value, add(data, 0x20), mload(data), 0, 0)
}
}
}
}
 
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contracts/test/4337/Test4337ModuleAndHandler.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
pragma abicoder v2;
import "../../libraries/SafeStorage.sol";
struct UserOperation {
address sender;
uint256 nonce;
bytes initCode;
bytes callData;
uint256 callGasLimit;
uint256 verificationGasLimit;
uint256 preVerificationGas;
uint256 maxFeePerGas;
uint256 maxPriorityFeePerGas;
bytes paymasterAndData;
bytes signature;
}
interface ISafe {
function execTransactionFromModule(address to, uint256 value, bytes memory data, uint8 operation) external returns (bool success);
}
/// @dev A Dummy 4337 Module/Handler for testing purposes
/// ⚠️ ⚠️ ⚠️ DO NOT USE IN PRODUCTION ⚠️ ⚠️ ⚠️
/// The module does not perform ANY validation, it just executes validateUserOp and execTransaction
/// to perform the opcode level compliance by the bundler.
contract Test4337ModuleAndHandler is SafeStorage {
address public immutable myAddress;
address public immutable entryPoint;
address internal constant SENTINEL_MODULES = address(0x1);
constructor(address entryPointAddress) {
entryPoint = entryPointAddress;
myAddress = address(this);
}
function validateUserOp(UserOperation calldata userOp, bytes32, uint256 missingAccountFunds) external returns (uint256 validationData) {
address payable safeAddress = payable(userOp.sender);
 
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contracts/test/ERC1155Token.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
import "../interfaces/ERC1155TokenReceiver.sol";
import "../external/SafeMath.sol";
/**
* @title ERC1155Token - A test ERC1155 token contract
*/
contract ERC1155Token {
using SafeMath for uint256;
// Mapping from token ID to owner balances
mapping(uint256 => mapping(address => uint256)) private _balances;
// Mapping from owner to operator approvals
mapping(address => mapping(address => bool)) private _operatorApprovals;
/**
* @dev Get the specified address' balance for token with specified ID.
* @param owner The address of the token holder
* @param id ID of the token
* @return The owner's balance of the token type requested
*/
function balanceOf(address owner, uint256 id) public view returns (uint256) {
require(owner != address(0), "ERC1155: balance query for the zero address");
return _balances[id][owner];
}
/**
* @notice Transfers `value` amount of an `id` from the `from` address to the `to` address specified.
* Caller must be approved to manage the tokens being transferred out of the `from` account.
* If `to` is a smart contract, will call `onERC1155Received` on `to` and act appropriately.
* @param from Source address
* @param to Target address
* @param id ID of the token type
* @param value Transfer amount
* @param data Data forwarded to `onERC1155Received` if `to` is a contract receiver
*/
function safeTransferFrom(address from, address to, uint256 id, uint256 value, bytes calldata data) external {
require(to != address(0), "ERC1155: target address must be non-zero");
 
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contracts/interfaces/ViewStorageAccessible.sol

pragma solidity >=0.5.0 <0.9.0;
/// @title ViewStorageAccessible - Interface on top of StorageAccessible base class to allow simulations from view functions.
/// @notice Adjusted version of https://github.com/gnosis/util-contracts/blob/3db1e531cb243a48ea91c60a800d537c1000612a/contracts/StorageAccessible.sol
interface ViewStorageAccessible {
/**
* @dev Same as `simulate` on StorageAccessible. Marked as view so that it can be called from external contracts
* that want to run simulations from within view functions. Will revert if the invoked simulation attempts to change state.
*/
function simulate(address targetContract, bytes calldata calldataPayload) external view returns (bytes memory);
}
 
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contracts/examples/guards/DelegateCallTransactionGuard.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
import "../../common/Enum.sol";
import "../../base/GuardManager.sol";
import "../../Safe.sol";
/**
* @title DelegateCallTransactionGuard - Limits delegate calls to a specific target.
* @author Richard Meissner - @rmeissner
*/
contract DelegateCallTransactionGuard is BaseGuard {
address public immutable allowedTarget;
constructor(address target) {
allowedTarget = target;
}
// solhint-disable-next-line payable-fallback
fallback() external {
// We don't revert on fallback to avoid issues in case of a Safe upgrade
// E.g. The expected check method might change and then the Safe would be locked.
}
/**
* @notice Called by the Safe contract before a transaction is executed.
* @dev Reverts if the transaction is a delegate call to contract other than the allowed one.
* @param to Destination address of Safe transaction.
* @param operation Operation type of Safe transaction.
*/
function checkTransaction(
address to,
uint256,
bytes memory,
Enum.Operation operation,
uint256,
uint256,
uint256,
address,
// solhint-disable-next-line no-unused-vars
address payable,
 
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contracts/interfaces/ERC721TokenReceiver.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
/// @dev Note: the ERC-165 identifier for this interface is 0x150b7a02.
interface ERC721TokenReceiver {
/**
* @notice Handle the receipt of an NFT
* @dev The ERC721 smart contract calls this function on the recipient
* after a `transfer`. This function MAY throw to revert and reject the
* transfer. Return of other than the magic value MUST result in the
* transaction being reverted.
* Note: the contract address is always the message sender.
* @param _operator The address which called `safeTransferFrom` function.
* @param _from The address which previously owned the token.
* @param _tokenId The NFT identifier which is being transferred.
* @param _data Additional data with no specified format.
* @return `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`.
* unless throwing
*/
function onERC721Received(address _operator, address _from, uint256 _tokenId, bytes calldata _data) external returns (bytes4);
}
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contracts/interfaces/IERC165.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
/// @notice More details at https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/introspection/IERC165.sol
interface IERC165 {
/**
* @dev Returns true if this contract implements the interface defined by `interfaceId`.
* See the corresponding EIP section
* https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified
* to learn more about how these ids are created.
*
* This function call must use less than 30 000 gas.
*/
function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
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contracts/common/NativeCurrencyPaymentFallback.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
/**
* @title NativeCurrencyPaymentFallback - A contract that has a fallback to accept native currency payments.
* @author Richard Meissner - @rmeissner
*/
abstract contract NativeCurrencyPaymentFallback {
event SafeReceived(address indexed sender, uint256 value);
/**
* @notice Receive function accepts native currency transactions.
* @dev Emits an event with sender and received value.
*/
receive() external payable {
emit SafeReceived(msg.sender, msg.value);
}
}
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contracts/common/StorageAccessible.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
/**
* @title StorageAccessible - A generic base contract that allows callers to access all internal storage.
* @notice See https://github.com/gnosis/util-contracts/blob/bb5fe5fb5df6d8400998094fb1b32a178a47c3a1/contracts/StorageAccessible.sol
* It removes a method from the original contract not needed for the Safe contracts.
* @author Gnosis Developers
*/
abstract contract StorageAccessible {
/**
* @notice Reads `length` bytes of storage in the currents contract
* @param offset - the offset in the current contract's storage in words to start reading from
* @param length - the number of words (32 bytes) of data to read
* @return the bytes that were read.
*/
function getStorageAt(uint256 offset, uint256 length) public view returns (bytes memory) {
bytes memory result = new bytes(length * 32);
for (uint256 index = 0; index < length; index++) {
// solhint-disable-next-line no-inline-assembly
assembly {
let word := sload(add(offset, index))
mstore(add(add(result, 0x20), mul(index, 0x20)), word)
}
}
return result;
}
/**
* @dev Performs a delegatecall on a targetContract in the context of self.
* Internally reverts execution to avoid side effects (making it static).
*
* This method reverts with data equal to `abi.encode(bool(success), bytes(response))`.
* Specifically, the `returndata` after a call to this method will be:
* `success:bool || response.length:uint256 || response:bytes`.
*
* @param targetContract Address of the contract containing the code to execute.
* @param calldataPayload Calldata that should be sent to the target contract (encoded method name and arguments).
*/
function simulateAndRevert(address targetContract, bytes memory calldataPayload) external {
// solhint-disable-next-line no-inline-assembly
 
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contracts/external/SafeMath.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
/**
* @title SafeMath
* @notice Math operations with safety checks that revert on error (overflow/underflow)
*/
library SafeMath {
/**
* @notice Multiplies two numbers, reverts on overflow.
* @param a First number
* @param b Second number
* @return Product of a and b
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
if (a == 0) {
return 0;
}
uint256 c = a * b;
require(c / a == b);
return c;
}
/**
* @notice Subtracts two numbers, reverts on overflow (i.e. if subtrahend is greater than minuend).
* @param a First number
* @param b Second number
* @return Difference of a and b
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
require(b <= a);
uint256 c = a - b;
return c;
}
 
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@openzeppelin/contracts/math/SafeMath.sol

// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/**
* @dev Wrappers over Solidity's arithmetic operations with added overflow
* checks.
*
* Arithmetic operations in Solidity wrap on overflow. This can easily result
* in bugs, because programmers usually assume that an overflow raises an
* error, which is the standard behavior in high level programming languages.
* `SafeMath` restores this intuition by reverting the transaction when an
* operation overflows.
*
* Using this library instead of the unchecked operations eliminates an entire
* class of bugs, so it's recommended to use it always.
*/
library SafeMath {
/**
* @dev Returns the addition of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
uint256 c = a + b;
if (c < a) return (false, 0);
return (true, c);
}
/**
* @dev Returns the substraction of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
if (b > a) return (false, 0);
return (true, a - b);
}
/**
* @dev Returns the multiplication of two unsigned integers, with an overflow flag.
 
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contracts/common/Singleton.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
/**
* @title Singleton - Base for singleton contracts (should always be the first super contract)
* This contract is tightly coupled to our proxy contract (see `proxies/SafeProxy.sol`)
* @author Richard Meissner - @rmeissner
*/
abstract contract Singleton {
// singleton always has to be the first declared variable to ensure the same location as in the Proxy contract.
// It should also always be ensured the address is stored alone (uses a full word)
address private singleton;
}
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@openzeppelin/contracts/token/ERC20/ERC20.sol

// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
import "../../utils/Context.sol";
import "./IERC20.sol";
import "../../math/SafeMath.sol";
/**
* @dev Implementation of the {IERC20} interface.
*
* This implementation is agnostic to the way tokens are created. This means
* that a supply mechanism has to be added in a derived contract using {_mint}.
* For a generic mechanism see {ERC20PresetMinterPauser}.
*
* TIP: For a detailed writeup see our guide
* https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
* to implement supply mechanisms].
*
* We have followed general OpenZeppelin guidelines: functions revert instead
* of returning `false` on failure. This behavior is nonetheless conventional
* and does not conflict with the expectations of ERC20 applications.
*
* Additionally, an {Approval} event is emitted on calls to {transferFrom}.
* This allows applications to reconstruct the allowance for all accounts just
* by listening to said events. Other implementations of the EIP may not emit
* these events, as it isn't required by the specification.
*
* Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
* functions have been added to mitigate the well-known issues around setting
* allowances. See {IERC20-approve}.
*/
contract ERC20 is Context, IERC20 {
using SafeMath for uint256;
mapping (address => uint256) private _balances;
mapping (address => mapping (address => uint256)) private _allowances;
uint256 private _totalSupply;
 
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contracts/common/Enum.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
/**
* @title Enum - Collection of enums used in Safe contracts.
* @author Richard Meissner - @rmeissner
*/
abstract contract Enum {
enum Operation {
Call,
DelegateCall
}
}
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contracts/base/GuardManager.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
import "../common/Enum.sol";
import "../common/SelfAuthorized.sol";
import "../interfaces/IERC165.sol";
interface Guard is IERC165 {
function checkTransaction(
address to,
uint256 value,
bytes memory data,
Enum.Operation operation,
uint256 safeTxGas,
uint256 baseGas,
uint256 gasPrice,
address gasToken,
address payable refundReceiver,
bytes memory signatures,
address msgSender
) external;
function checkAfterExecution(bytes32 txHash, bool success) external;
}
abstract contract BaseGuard is Guard {
function supportsInterface(bytes4 interfaceId) external view virtual override returns (bool) {
return
interfaceId == type(Guard).interfaceId || // 0xe6d7a83a
interfaceId == type(IERC165).interfaceId; // 0x01ffc9a7
}
}
/**
* @title Guard Manager - A contract managing transaction guards which perform pre and post-checks on Safe transactions.
* @author Richard Meissner - @rmeissner
*/
abstract contract GuardManager is SelfAuthorized {
event ChangedGuard(address indexed guard);
// keccak256("guard_manager.guard.address")
 
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contracts/interfaces/ERC1155TokenReceiver.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
// Note: The ERC-165 identifier for this interface is 0x4e2312e0.
interface ERC1155TokenReceiver {
/**
* @notice Handle the receipt of a single ERC1155 token type.
* @dev An ERC1155-compliant smart contract MUST call this function on the token recipient contract, at the end of a `safeTransferFrom` after the balance has been updated.
* This function MUST return `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))` (i.e. 0xf23a6e61) if it accepts the transfer.
* This function MUST revert if it rejects the transfer.
* Return of any other value than the prescribed keccak256 generated value MUST result in the transaction being reverted by the caller.
* @param _operator The address which initiated the transfer (i.e. msg.sender).
* @param _from The address which previously owned the token.
* @param _id The ID of the token being transferred.
* @param _value The amount of tokens being transferred.
* @param _data Additional data with no specified format.
* @return `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))`.
*/
function onERC1155Received(
address _operator,
address _from,
uint256 _id,
uint256 _value,
bytes calldata _data
) external returns (bytes4);
/**
* @notice Handle the receipt of multiple ERC1155 token types.
* @dev An ERC1155-compliant smart contract MUST call this function on the token recipient contract, at the end of a `safeBatchTransferFrom` after the balances have been updated.
* This function MUST return `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))` (i.e. 0xbc197c81) if it accepts the transfer(s).
* This function MUST revert if it rejects the transfer(s).
* Return of any other value than the prescribed keccak256 generated value MUST result in the transaction being reverted by the caller.
* @param _operator The address which initiated the batch transfer (i.e. msg.sender).
* @param _from The address which previously owned the token.
* @param _ids An array containing ids of each token being transferred (order and length must match _values array).
* @param _values An array containing amounts of each token being transferred (order and length must match _ids array).
* @param _data Additional data with no specified format.
* @return `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))`.
*/
function onERC1155BatchReceived(
address _operator,
 
 
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contracts/base/ModuleManager.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
import "../common/Enum.sol";
import "../common/SelfAuthorized.sol";
import "./Executor.sol";
/**
* @title Module Manager - A contract managing Safe modules
* @notice Modules are extensions with unlimited access to a Safe that can be added to a Safe by its owners.
⚠️ WARNING: Modules are a security risk since they can execute arbitrary transactions,
so only trusted and audited modules should be added to a Safe. A malicious module can
completely takeover a Safe.
* @author Stefan George - @Georgi87
* @author Richard Meissner - @rmeissner
*/
abstract contract ModuleManager is SelfAuthorized, Executor {
event EnabledModule(address indexed module);
event DisabledModule(address indexed module);
event ExecutionFromModuleSuccess(address indexed module);
event ExecutionFromModuleFailure(address indexed module);
address internal constant SENTINEL_MODULES = address(0x1);
mapping(address => address) internal modules;
/**
* @notice Setup function sets the initial storage of the contract.
* Optionally executes a delegate call to another contract to setup the modules.
* @param to Optional destination address of call to execute.
* @param data Optional data of call to execute.
*/
function setupModules(address to, bytes memory data) internal {
require(modules[SENTINEL_MODULES] == address(0), "GS100");
modules[SENTINEL_MODULES] = SENTINEL_MODULES;
if (to != address(0)) {
require(isContract(to), "GS002");
// Setup has to complete successfully or transaction fails.
require(execute(to, 0, data, Enum.Operation.DelegateCall, type(uint256).max), "GS000");
}
}
 
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contracts/libraries/CreateCall.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
/**
* @title Create Call - Allows to use the different create opcodes to deploy a contract.
* @author Richard Meissner - @rmeissner
* @notice This contract provides functions for deploying a new contract using the create and create2 opcodes.
*/
contract CreateCall {
/// @notice Emitted when a new contract is created
event ContractCreation(address indexed newContract);
/**
* @notice Deploys a new contract using the create2 opcode.
* @param value The value in wei to be sent with the contract creation.
* @param deploymentData The initialisation code of the contract to be created.
* @param salt The salt value to use for the contract creation.
* @return newContract The address of the newly created contract.
*/
function performCreate2(uint256 value, bytes memory deploymentData, bytes32 salt) public returns (address newContract) {
// solhint-disable-next-line no-inline-assembly
assembly {
newContract := create2(value, add(0x20, deploymentData), mload(deploymentData), salt)
}
require(newContract != address(0), "Could not deploy contract");
emit ContractCreation(newContract);
}
/**
* @notice Deploys a new contract using the create opcode.
* @param value The value in wei to be sent with the contract creation.
* @param deploymentData The initialisation code of the contract to be created.
* @return newContract The address of the newly created contract.
*/
function performCreate(uint256 value, bytes memory deploymentData) public returns (address newContract) {
// solhint-disable-next-line no-inline-assembly
assembly {
newContract := create(value, add(deploymentData, 0x20), mload(deploymentData))
}
require(newContract != address(0), "Could not deploy contract");
 
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contracts/base/OwnerManager.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
import "../common/SelfAuthorized.sol";
/**
* @title OwnerManager - Manages Safe owners and a threshold to authorize transactions.
* @dev Uses a linked list to store the owners because the code generate by the solidity compiler
* is more efficient than using a dynamic array.
* @author Stefan George - @Georgi87
* @author Richard Meissner - @rmeissner
*/
abstract contract OwnerManager is SelfAuthorized {
event AddedOwner(address indexed owner);
event RemovedOwner(address indexed owner);
event ChangedThreshold(uint256 threshold);
address internal constant SENTINEL_OWNERS = address(0x1);
mapping(address => address) internal owners;
uint256 internal ownerCount;
uint256 internal threshold;
/**
* @notice Sets the initial storage of the contract.
* @param _owners List of Safe owners.
* @param _threshold Number of required confirmations for a Safe transaction.
*/
function setupOwners(address[] memory _owners, uint256 _threshold) internal {
// Threshold can only be 0 at initialization.
// Check ensures that setup function can only be called once.
require(threshold == 0, "GS200");
// Validate that threshold is smaller than number of added owners.
require(_threshold <= _owners.length, "GS201");
// There has to be at least one Safe owner.
require(_threshold >= 1, "GS202");
// Initializing Safe owners.
address currentOwner = SENTINEL_OWNERS;
for (uint256 i = 0; i < _owners.length; i++) {
// Owner address cannot be null.
address owner = _owners[i];
require(owner != address(0) && owner != SENTINEL_OWNERS && owner != address(this) && currentOwner != owner, "GS203");
 
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contracts/test/ERC20Token.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.6.0 <0.8.0;
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
/**
* @title ERC20Token
* @dev This contract is an ERC20 token contract that extends the OpenZeppelin ERC20 contract.
*/
contract ERC20Token is ERC20 {
/**
* @dev Constructor that sets the name and symbol of the token and mints an initial supply to the contract deployer.
*/
constructor() public ERC20("TestToken", "TT") {
_mint(msg.sender, 1000000000000000);
}
}
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contracts/libraries/MultiSend.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
/**
* @title Multi Send - Allows to batch multiple transactions into one.
* @author Nick Dodson - <nick.dodson@consensys.net>
* @author Gonçalo Sá - <goncalo.sa@consensys.net>
* @author Stefan George - @Georgi87
* @author Richard Meissner - @rmeissner
*/
contract MultiSend {
address private immutable multisendSingleton;
constructor() {
multisendSingleton = address(this);
}
/**
* @dev Sends multiple transactions and reverts all if one fails.
* @param transactions Encoded transactions. Each transaction is encoded as a packed bytes of
* operation as a uint8 with 0 for a call or 1 for a delegatecall (=> 1 byte),
* to as a address (=> 20 bytes),
* value as a uint256 (=> 32 bytes),
* data length as a uint256 (=> 32 bytes),
* data as bytes.
* see abi.encodePacked for more information on packed encoding
* @notice This method is payable as delegatecalls keep the msg.value from the previous call
* If the calling method (e.g. execTransaction) received ETH this would revert otherwise
*/
function multiSend(bytes memory transactions) public payable {
require(address(this) != multisendSingleton, "MultiSend should only be called via delegatecall");
// solhint-disable-next-line no-inline-assembly
assembly {
let length := mload(transactions)
let i := 0x20
for {
// Pre block is not used in "while mode"
} lt(i, length) {
// Post block is not used in "while mode"
} {
// First byte of the data is the operation.
 
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contracts/libraries/SafeStorage.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
/**
* @title SafeStorage - Storage layout of the Safe contracts to be used in libraries.
* @dev Should be always the first base contract of a library that is used with a Safe.
* @author Richard Meissner - @rmeissner
*/
contract SafeStorage {
// From /common/Singleton.sol
address internal singleton;
// From /common/ModuleManager.sol
mapping(address => address) internal modules;
// From /common/OwnerManager.sol
mapping(address => address) internal owners;
uint256 internal ownerCount;
uint256 internal threshold;
// From /Safe.sol
uint256 internal nonce;
bytes32 internal _deprecatedDomainSeparator;
mapping(bytes32 => uint256) internal signedMessages;
mapping(address => mapping(bytes32 => uint256)) internal approvedHashes;
}
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contracts/examples/guards/ReentrancyTransactionGuard.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
import "../../common/Enum.sol";
import "../../base/GuardManager.sol";
import "../../Safe.sol";
/**
* @title ReentrancyTransactionGuard - Prevents reentrancy into the transaction execution function.
* @author Richard Meissner - @rmeissner
*/
contract ReentrancyTransactionGuard is BaseGuard {
bytes32 internal constant GUARD_STORAGE_SLOT = keccak256("reentrancy_guard.guard.struct");
struct GuardValue {
bool active;
}
// solhint-disable-next-line payable-fallback
fallback() external {
// We don't revert on fallback to avoid issues in case of a Safe upgrade
// E.g. The expected check method might change and then the Safe would be locked.
}
/**
* @notice Returns the guard value for the current context.
* @dev The guard value is stored in a slot that is unique to the contract instance and the function in which it is called.
* @return guard The guard value.
*/
function getGuard() internal pure returns (GuardValue storage guard) {
bytes32 slot = GUARD_STORAGE_SLOT;
// solhint-disable-next-line no-inline-assembly
assembly {
guard.slot := slot
}
}
/**
* @notice Called by the Safe contract before a transaction is executed.
* @dev Reverts if reentrancy is detected.
*/
 
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@openzeppelin/contracts/token/ERC20/IERC20.sol

// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves `amount` tokens from the caller's account to `recipient`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address recipient, uint256 amount) external returns (bool);
/**
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* zero by default.
*
* This value changes when {approve} or {transferFrom} are called.
*/
function allowance(address owner, address spender) external view returns (uint256);
/**
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
*
* Returns a boolean value indicating whether the operation succeeded.
*
 
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contracts/base/FallbackManager.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
import "../common/SelfAuthorized.sol";
/**
* @title Fallback Manager - A contract managing fallback calls made to this contract
* @author Richard Meissner - @rmeissner
*/
abstract contract FallbackManager is SelfAuthorized {
event ChangedFallbackHandler(address indexed handler);
// keccak256("fallback_manager.handler.address")
bytes32 internal constant FALLBACK_HANDLER_STORAGE_SLOT = 0x6c9a6c4a39284e37ed1cf53d337577d14212a4870fb976a4366c693b939918d5;
/**
* @notice Internal function to set the fallback handler.
* @param handler contract to handle fallback calls.
*/
function internalSetFallbackHandler(address handler) internal {
/*
If a fallback handler is set to self, then the following attack vector is opened:
Imagine we have a function like this:
function withdraw() internal authorized {
withdrawalAddress.call.value(address(this).balance)("");
}
If the fallback method is triggered, the fallback handler appends the msg.sender address to the calldata and calls the fallback handler.
A potential attacker could call a Safe with the 3 bytes signature of a withdraw function. Since 3 bytes do not create a valid signature,
the call would end in a fallback handler. Since it appends the msg.sender address to the calldata, the attacker could craft an address
where the first 3 bytes of the previous calldata + the first byte of the address make up a valid function signature. The subsequent call would result in unsanctioned access to Safe's internal protected methods.
For some reason, solidity matches the first 4 bytes of the calldata to a function signature, regardless if more data follow these 4 bytes.
*/
require(handler != address(this), "GS400");
bytes32 slot = FALLBACK_HANDLER_STORAGE_SLOT;
// solhint-disable-next-line no-inline-assembly
assembly {
sstore(slot, handler)
}
}
 
 
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contracts/examples/guards/OnlyOwnersGuard.sol

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity >=0.7.0 <0.9.0;
import "../../common/Enum.sol";
import "../../base/GuardManager.sol";
import "../../Safe.sol";
interface ISafe {
function getOwners() external view returns (address[] memory);
}
/**
* @title OnlyOwnersGuard - Only allows owners to execute transactions.
* @author Richard Meissner - @rmeissner
*/
contract OnlyOwnersGuard is BaseGuard {
ISafe public safe;
constructor() {}
// solhint-disable-next-line payable-fallback
fallback() external {
// We don't revert on fallback to avoid issues in case of a Safe upgrade
// E.g. The expected check method might change and then the Safe would be locked.
}
/**
* @notice Called by the Safe contract before a transaction is executed.
* @dev Reverts if the transaction is not executed by an owner.
* @param msgSender Executor of the transaction.
*/
function checkTransaction(
address,
uint256,
bytes memory,
Enum.Operation,
uint256,
uint256,
uint256,
address,
// solhint-disable-next-line no-unused-vars
 
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XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Compiler Settings

{"outputSelection":{"*":{"*":["abi","evm.bytecode","evm.deployedBytecode","evm.methodIdentifiers"]}},"optimizer":{"runs":200,"enabled":false},"metadata":{"useLiteralContent":true},"libraries":{}}
              

Contract ABI

[{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"address","name":"proxy","internalType":"contract SafeProxy"}],"name":"createChainSpecificProxyWithNonce","inputs":[{"type":"address","name":"_singleton","internalType":"address"},{"type":"bytes","name":"initializer","internalType":"bytes"},{"type":"uint256","name":"saltNonce","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"address","name":"proxy","internalType":"contract SafeProxy"}],"name":"createProxyWithCallback","inputs":[{"type":"address","name":"_singleton","internalType":"address"},{"type":"bytes","name":"initializer","internalType":"bytes"},{"type":"uint256","name":"saltNonce","internalType":"uint256"},{"type":"address","name":"callback","internalType":"contract IProxyCreationCallback"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"address","name":"proxy","internalType":"contract SafeProxy"}],"name":"createProxyWithNonce","inputs":[{"type":"address","name":"_singleton","internalType":"address"},{"type":"bytes","name":"initializer","internalType":"bytes"},{"type":"uint256","name":"saltNonce","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"getChainId","inputs":[]},{"type":"function","stateMutability":"pure","outputs":[{"type":"bytes","name":"","internalType":"bytes"}],"name":"proxyCreationCode","inputs":[]},{"type":"event","name":"ProxyCreation","inputs":[{"type":"address","name":"proxy","indexed":true},{"type":"address","name":"singleton","indexed":false}],"anonymous":false}]
              

Contract Creation Code

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Deployed ByteCode

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