Transaction Hash:
Block:
14348956 at Mar-08-2022 10:52:13 PM +UTC
Transaction Fee:
0.003791808456314064 ETH
$11.52
Gas Used:
49,233 Gas / 77.017619408 Gwei
Emitted Events:
| 96 |
GnosisSafeProxy.0x3d0ce9bfc3ed7d6862dbb28b2dea94561fe714a1b4d019aa8af39730d1ad7c3d( 0x3d0ce9bfc3ed7d6862dbb28b2dea94561fe714a1b4d019aa8af39730d1ad7c3d, 0x000000000000000000000000cef9304eacdda126572cc1bda53963ff21bd8a12, 00000000000000000000000000000000000000000000000000b5303ad38b8000 )
|
Account State Difference:
| Address | Before | After | State Difference | ||
|---|---|---|---|---|---|
| 0x16e6F2B9...77e765337 |
0.3029071124988204 Eth
Nonce: 600
|
1.268115304042506336 Eth
Nonce: 601
| 0.965208191543685936 | ||
| 0x704C043C...1C0310587 | 6.729805686119435181 Eth | 6.780805686119435181 Eth | 0.051 | ||
| 0xCef9304E...f21Bd8a12 | 1.02 Eth | 0 Eth | 1.02 | ||
|
0xEA674fdD...16B898ec8
Miner
| (Ethermine) | 455.332379382610300456 Eth | 455.332428615610300456 Eth | 0.000049233 |
Execution Trace
MetaverseNFT.CALL( )
MetaverseNFT.CALL( )
MetaverseNFT.DELEGATECALL( )- ETH 0.969
0x16e6f2b9d07b929f58355778887733677e765337.CALL( ) ETH 0.051
GnosisSafeProxy.CALL( )- ETH 0.051
GnosisSafe.DELEGATECALL( )
- ETH 0.051
- ETH 0.969
File 1 of 4: MetaverseNFT
File 2 of 4: GnosisSafeProxy
File 3 of 4: MetaverseNFT
File 4 of 4: GnosisSafe
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;
/**
* @title LICENSE REQUIREMENT
* @dev This contract is licensed under the MIT license.
* @dev You're not allowed to remove DEVELOPER() and DEVELOPER_ADDRESS() from contract
*/
import "@openzeppelin/contracts-upgradeable/token/ERC721/ERC721Upgradeable.sol";
import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/security/ReentrancyGuardUpgradeable.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/utils/Counters.sol";
import "@openzeppelin/contracts/utils/introspection/ERC165Checker.sol";
import "@openzeppelin/contracts/interfaces/IERC2981.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "./extensions/INFTExtension.sol";
import "./IMetaverseNFT.sol";
import "./OpenseaProxy.sol";
// Want to launch your own collection ? Check out https://buildship.dev.
//
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contract MetaverseNFT is
ERC721Upgradeable,
ReentrancyGuardUpgradeable,
OwnableUpgradeable,
IMetaverseNFT // implements IERC2981
{
using Address for address;
using SafeERC20 for IERC20;
using Counters for Counters.Counter;
Counters.Counter private _tokenIdCounter;
uint256 public constant SALE_STARTS_AT_INFINITY = 2**256 - 1;
uint256 public constant DEVELOPER_FEE = 500; // of 10,000 = 5%
uint256 public startTimestamp = SALE_STARTS_AT_INFINITY;
uint256 public createdAt;
uint256 public reserved;
uint256 public maxSupply;
uint256 public maxPerMint;
uint256 public price;
uint256 public royaltyFee;
address public royaltyReceiver;
address public uriExtension = address(0x0);
bool public isFrozen;
bool private isOpenSeaProxyActive;
/**
* @dev Additional data for each token that needs to be stored and accessed on-chain
*/
mapping (uint256 => bytes32) public data;
/**
* @dev List of connected extensions
*/
INFTExtension[] public extensions;
string public PROVENANCE_HASH = "";
string private CONTRACT_URI = "";
string private BASE_URI;
event ExtensionAdded(address indexed extensionAddress);
event ExtensionRevoked(address indexed extensionAddress);
event ExtensionURIAdded(address indexed extensionAddress);
function initialize(
uint256 _price,
uint256 _maxSupply,
uint256 _nReserved,
uint256 _maxPerMint,
uint256 _royaltyFee,
string memory _uri,
string memory _name, string memory _symbol
) public initializer {
__ERC721_init(_name, _symbol);
__ReentrancyGuard_init();
__Ownable_init();
createdAt = block.timestamp;
startTimestamp = SALE_STARTS_AT_INFINITY;
price = _price;
reserved = _nReserved;
maxPerMint = _maxPerMint;
maxSupply = _maxSupply;
royaltyFee = _royaltyFee;
royaltyReceiver = address(this);
// Need help with uploading metadata? Try https://buildship.dev
BASE_URI = _uri;
}
// This constructor ensures that this contract can only be used as a master copy
// Marking constructor as initializer makes sure that real initializer cannot be called
// Thus, as the owner of the contract is 0x0, no one can do anything with the contract
// on the other hand, it's impossible to call this function in proxy,
// so the real initializer is the only initializer
/// @custom:oz-upgrades-unsafe-allow constructor
constructor() initializer {}
function _baseURI() internal view override returns (string memory) {
return BASE_URI;
}
function contractURI() public view returns (string memory uri) {
uri = bytes(CONTRACT_URI).length > 0 ? CONTRACT_URI : _baseURI();
}
function tokenURI(uint256 tokenId) public view override returns (string memory) {
if (uriExtension != address(0)) {
string memory uri = INFTURIExtension(uriExtension).tokenURI(tokenId);
if (bytes(uri).length > 0) {
return uri;
}
}
return super.tokenURI(tokenId);
}
// ----- Admin functions -----
function setBaseURI(string calldata uri) public onlyOwner {
BASE_URI = uri;
}
// Contract-level metadata for Opensea
function setContractURI(string calldata uri) public onlyOwner {
CONTRACT_URI = uri;
}
function setPrice(uint256 _price) public onlyOwner {
price = _price;
}
// Freeze forever, irreversible
function freeze() public onlyOwner {
isFrozen = true;
}
function isExtensionAllowed(address _extension) public view returns (bool) {
if (!ERC165Checker.supportsInterface(_extension, type(INFTExtension).interfaceId)) {
return false;
}
for (uint index = 0; index < extensions.length; index++) {
if (extensions[index] == INFTExtension(_extension)) {
return true;
}
}
return false;
}
// Extensions are allowed to mint
function addExtension(address _extension) public onlyOwner {
require(_extension != address(this), "Cannot add self as extension");
require(!isExtensionAllowed(_extension), "Extension already added");
extensions.push(INFTExtension(_extension));
emit ExtensionAdded(_extension);
}
function revokeExtension(address _extension) public onlyOwner {
uint256 index = 0;
for (; index < extensions.length; index++) {
if (extensions[index] == INFTExtension(_extension)) {
break;
}
}
extensions[index] = extensions[extensions.length - 1];
extensions.pop();
emit ExtensionRevoked(_extension);
}
function setExtensionTokenURI(address extension) public onlyOwner {
require(extension != address(this), "Cannot add self as extension");
require(extension == address(0x0) || ERC165Checker.supportsInterface(extension, type(INFTURIExtension).interfaceId), "Not conforms to extension");
uriExtension = extension;
emit ExtensionURIAdded(extension);
}
// function to disable gasless listings for security in case
// opensea ever shuts down or is compromised
// from CryptoCoven https://etherscan.io/address/0x5180db8f5c931aae63c74266b211f580155ecac8#code
function setIsOpenSeaProxyActive(bool _isOpenSeaProxyActive) public onlyOwner {
isOpenSeaProxyActive = _isOpenSeaProxyActive;
}
// ---- Minting ----
function _mintConsecutive(uint256 nTokens, address to, bytes32 extraData) internal {
require(_tokenIdCounter.current() + nTokens + reserved <= maxSupply, "Not enough Tokens left.");
for (uint256 i; i < nTokens; i++) {
uint256 tokenId = _tokenIdCounter.current();
_tokenIdCounter.increment();
_safeMint(to, tokenId);
data[tokenId] = extraData;
}
}
// ---- Mint control ----
modifier whenSaleStarted() {
require(saleStarted(), "Sale not started");
_;
}
modifier whenNotFrozen() {
require(!isFrozen, "Minting is frozen");
_;
}
modifier onlyExtension() {
require(isExtensionAllowed(msg.sender), "Extension should be added to contract before minting");
_;
}
// ---- Mint public ----
// Contract can sell tokens
function mint(uint256 nTokens) external payable nonReentrant whenSaleStarted {
require(nTokens <= maxPerMint, "You cannot mint more than MAX_TOKENS_PER_MINT tokens at once!");
require(nTokens * price <= msg.value, "Inconsistent amount sent!");
_mintConsecutive(nTokens, msg.sender, 0x0);
}
// Owner can claim free tokens
function claim(uint256 nTokens, address to) external nonReentrant onlyOwner {
require(nTokens <= reserved, "That would exceed the max reserved.");
reserved = reserved - nTokens;
_mintConsecutive(nTokens, to, 0x0);
}
// ---- Mint via extension
function mintExternal(uint256 nTokens, address to, bytes32 extraData) external payable onlyExtension nonReentrant {
_mintConsecutive(nTokens, to, extraData);
}
// ---- Sale control ----
function updateStartTimestamp(uint256 _startTimestamp) public onlyOwner whenNotFrozen {
startTimestamp = _startTimestamp;
}
function startSale() public onlyOwner whenNotFrozen {
startTimestamp = block.timestamp;
}
function stopSale() public onlyOwner {
startTimestamp = SALE_STARTS_AT_INFINITY;
}
function saleStarted() public view returns (bool) {
return block.timestamp >= startTimestamp;
}
// ---- Offchain Info ----
// This should be set before sales open.
function setProvenanceHash(string memory provenanceHash) public onlyOwner {
PROVENANCE_HASH = provenanceHash;
}
function setRoyaltyFee(uint256 _royaltyFee) public onlyOwner {
royaltyFee = _royaltyFee;
}
function setRoyaltyReceiver(address _receiver) public onlyOwner {
require(block.timestamp >= createdAt + 26 weeks, "Only after 6 months of contract creation can the royalty receiver be changed.");
royaltyReceiver = _receiver;
}
function royaltyInfo(uint256, uint256 salePrice) external view returns (address receiver, uint256 royaltyAmount) {
// We use the same contract to split royalties: 5% of royalty goes to the developer
receiver = royaltyReceiver;
royaltyAmount = salePrice * royaltyFee / 10000;
}
// ---- Withdraw -----
function withdraw() public onlyOwner {
uint256 balance = address(this).balance;
uint256 amount = balance * (10000 - DEVELOPER_FEE) / 10000;
address payable dev = DEVELOPER_ADDRESS();
Address.sendValue(payable(msg.sender), amount);
Address.sendValue(dev, balance - amount);
}
function withdrawToken(IERC20 token) public onlyOwner {
uint256 balance = token.balanceOf(address(this));
uint256 amount = balance * (10000 - DEVELOPER_FEE) / 10000;
address payable dev = DEVELOPER_ADDRESS();
token.safeTransfer(payable(msg.sender), amount);
token.safeTransfer(dev, balance - amount);
}
function DEVELOPER() public pure returns (string memory _url) {
_url = "https://buildship.dev";
}
function DEVELOPER_ADDRESS() public pure returns (address payable _dev) {
_dev = payable(0x704C043CeB93bD6cBE570C6A2708c3E1C0310587);
}
// -------- ERC721 overrides --------
function supportsInterface(bytes4 interfaceId)
public
view
override
returns (bool)
{
return interfaceId == type(IERC2981).interfaceId
|| interfaceId == type(IMetaverseNFT).interfaceId
|| super.supportsInterface(interfaceId);
}
/**
* @dev Override isApprovedForAll to allowlist user's OpenSea proxy accounts to enable gas-less listings.
* Taken from CryptoCoven: https://etherscan.io/address/0x5180db8f5c931aae63c74266b211f580155ecac8#code
*/
function isApprovedForAll(address owner, address operator)
public
view
override
returns (bool)
{
// Get a reference to OpenSea's proxy registry contract by instantiating
// the contract using the already existing address.
ProxyRegistry proxyRegistry = ProxyRegistry(0xa5409ec958C83C3f309868babACA7c86DCB077c1);
if (isOpenSeaProxyActive && address(proxyRegistry.proxies(owner)) == operator) {
return true;
}
return super.isApprovedForAll(owner, operator);
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;
import "@openzeppelin/contracts/utils/introspection/IERC165.sol";
interface INFTExtension is IERC165 {
}
interface INFTURIExtension is INFTExtension {
function tokenURI(uint256 tokenId) external view returns (string memory);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;
// These contract definitions are used to create a reference to the OpenSea
// ProxyRegistry contract by using the registry's address (see isApprovedForAll).
interface OwnableDelegateProxy {
}
interface ProxyRegistry {
function proxies(address) external view returns (OwnableDelegateProxy);
}
library SupportsOpensea {
// Use like this:
// if (isOpenSeaProxyActive && SupportsOpensea.isApprovedForAll(owner, operator)) {
// return true;
// }
function isApprovedForAll(address owner, address operator) public view returns (bool) {
// Get a reference to OpenSea's proxy registry contract by instantiating
// the contract using the already existing address.
ProxyRegistry proxyRegistry = ProxyRegistry(0xa5409ec958C83C3f309868babACA7c86DCB077c1);
return address(proxyRegistry.proxies(owner)) == operator;
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;
import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
interface IAvatarNFT {
function DEVELOPER() external pure returns (string memory _url);
function DEVELOPER_ADDRESS() external pure returns (address payable _dev);
// ------ View functions ------
function saleStarted() external view returns (bool);
function isExtensionAllowed(address extension) external view returns (bool);
/**
Extra information stored for each tokenId. Optional, provided on mint
*/
function data(uint256 tokenId) external view returns (bytes32);
// ------ Mint functions ------
/**
Mint from NFTExtension contract. Optionally provide data parameter.
*/
function mintExternal(uint256 nTokens, address to, bytes32 data) external payable;
// ------ Admin functions ------
function addExtension(address extension) external;
function revokeExtension(address extension) external;
function withdraw() external;
}
interface IMetaverseNFT is IAvatarNFT {
// ------ View functions ------
/**
Recommended royalty for tokenId sale.
*/
function royaltyInfo(uint256 tokenId, uint256 salePrice) external view returns (address receiver, uint256 royaltyAmount);
// ------ Admin functions ------
function setRoyaltyReceiver(address receiver) external;
function setRoyaltyFee(uint256 fee) external;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @dev Interface of the ERC165 standard, as defined in the
* https://eips.ethereum.org/EIPS/eip-165[EIP].
*
* Implementers can declare support of contract interfaces, which can then be
* queried by others ({ERC165Checker}).
*
* For an implementation, see {ERC165}.
*/
interface IERC165 {
/**
* @dev Returns true if this contract implements the interface defined by
* `interfaceId`. See the corresponding
* https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
* 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);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "./IERC165.sol";
/**
* @dev Library used to query support of an interface declared via {IERC165}.
*
* Note that these functions return the actual result of the query: they do not
* `revert` if an interface is not supported. It is up to the caller to decide
* what to do in these cases.
*/
library ERC165Checker {
// As per the EIP-165 spec, no interface should ever match 0xffffffff
bytes4 private constant _INTERFACE_ID_INVALID = 0xffffffff;
/**
* @dev Returns true if `account` supports the {IERC165} interface,
*/
function supportsERC165(address account) internal view returns (bool) {
// Any contract that implements ERC165 must explicitly indicate support of
// InterfaceId_ERC165 and explicitly indicate non-support of InterfaceId_Invalid
return
_supportsERC165Interface(account, type(IERC165).interfaceId) &&
!_supportsERC165Interface(account, _INTERFACE_ID_INVALID);
}
/**
* @dev Returns true if `account` supports the interface defined by
* `interfaceId`. Support for {IERC165} itself is queried automatically.
*
* See {IERC165-supportsInterface}.
*/
function supportsInterface(address account, bytes4 interfaceId) internal view returns (bool) {
// query support of both ERC165 as per the spec and support of _interfaceId
return supportsERC165(account) && _supportsERC165Interface(account, interfaceId);
}
/**
* @dev Returns a boolean array where each value corresponds to the
* interfaces passed in and whether they're supported or not. This allows
* you to batch check interfaces for a contract where your expectation
* is that some interfaces may not be supported.
*
* See {IERC165-supportsInterface}.
*
* _Available since v3.4._
*/
function getSupportedInterfaces(address account, bytes4[] memory interfaceIds)
internal
view
returns (bool[] memory)
{
// an array of booleans corresponding to interfaceIds and whether they're supported or not
bool[] memory interfaceIdsSupported = new bool[](interfaceIds.length);
// query support of ERC165 itself
if (supportsERC165(account)) {
// query support of each interface in interfaceIds
for (uint256 i = 0; i < interfaceIds.length; i++) {
interfaceIdsSupported[i] = _supportsERC165Interface(account, interfaceIds[i]);
}
}
return interfaceIdsSupported;
}
/**
* @dev Returns true if `account` supports all the interfaces defined in
* `interfaceIds`. Support for {IERC165} itself is queried automatically.
*
* Batch-querying can lead to gas savings by skipping repeated checks for
* {IERC165} support.
*
* See {IERC165-supportsInterface}.
*/
function supportsAllInterfaces(address account, bytes4[] memory interfaceIds) internal view returns (bool) {
// query support of ERC165 itself
if (!supportsERC165(account)) {
return false;
}
// query support of each interface in _interfaceIds
for (uint256 i = 0; i < interfaceIds.length; i++) {
if (!_supportsERC165Interface(account, interfaceIds[i])) {
return false;
}
}
// all interfaces supported
return true;
}
/**
* @notice Query if a contract implements an interface, does not check ERC165 support
* @param account The address of the contract to query for support of an interface
* @param interfaceId The interface identifier, as specified in ERC-165
* @return true if the contract at account indicates support of the interface with
* identifier interfaceId, false otherwise
* @dev Assumes that account contains a contract that supports ERC165, otherwise
* the behavior of this method is undefined. This precondition can be checked
* with {supportsERC165}.
* Interface identification is specified in ERC-165.
*/
function _supportsERC165Interface(address account, bytes4 interfaceId) private view returns (bool) {
bytes memory encodedParams = abi.encodeWithSelector(IERC165.supportsInterface.selector, interfaceId);
(bool success, bytes memory result) = account.staticcall{gas: 30000}(encodedParams);
if (result.length < 32) return false;
return success && abi.decode(result, (bool));
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @title Counters
* @author Matt Condon (@shrugs)
* @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number
* of elements in a mapping, issuing ERC721 ids, or counting request ids.
*
* Include with `using Counters for Counters.Counter;`
*/
library Counters {
struct Counter {
// This variable should never be directly accessed by users of the library: interactions must be restricted to
// the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
// this feature: see https://github.com/ethereum/solidity/issues/4637
uint256 _value; // default: 0
}
function current(Counter storage counter) internal view returns (uint256) {
return counter._value;
}
function increment(Counter storage counter) internal {
unchecked {
counter._value += 1;
}
}
function decrement(Counter storage counter) internal {
uint256 value = counter._value;
require(value > 0, "Counter: decrement overflow");
unchecked {
counter._value = value - 1;
}
}
function reset(Counter storage counter) internal {
counter._value = 0;
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @dev Collection of functions related to the address type
*/
library Address {
/**
* @dev Returns true if `account` is a contract.
*
* [IMPORTANT]
* ====
* It is unsafe to assume that an address for which this function returns
* false is an externally-owned account (EOA) and not a contract.
*
* Among others, `isContract` will return false for the following
* types of addresses:
*
* - an externally-owned account
* - a contract in construction
* - an address where a contract will be created
* - an address where a contract lived, but was destroyed
* ====
*/
function isContract(address account) internal view returns (bool) {
// This method relies on extcodesize, which returns 0 for contracts in
// construction, since the code is only stored at the end of the
// constructor execution.
uint256 size;
assembly {
size := extcodesize(account)
}
return size > 0;
}
/**
* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
* `recipient`, forwarding all available gas and reverting on errors.
*
* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
* of certain opcodes, possibly making contracts go over the 2300 gas limit
* imposed by `transfer`, making them unable to receive funds via
* `transfer`. {sendValue} removes this limitation.
*
* https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* {ReentrancyGuard} or the
* https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
(bool success, ) = recipient.call{value: amount}("");
require(success, "Address: unable to send value, recipient may have reverted");
}
/**
* @dev Performs a Solidity function call using a low level `call`. A
* plain `call` is an unsafe replacement for a function call: use this
* function instead.
*
* If `target` reverts with a revert reason, it is bubbled up by this
* function (like regular Solidity function calls).
*
* Returns the raw returned data. To convert to the expected return value,
* use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
*
* Requirements:
*
* - `target` must be a contract.
* - calling `target` with `data` must not revert.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
return functionCall(target, data, "Address: low-level call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
* `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
return functionCallWithValue(target, data, 0, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but also transferring `value` wei to `target`.
*
* Requirements:
*
* - the calling contract must have an ETH balance of at least `value`.
* - the called Solidity function must be `payable`.
*
* _Available since v3.1._
*/
function functionCallWithValue(
address target,
bytes memory data,
uint256 value
) internal returns (bytes memory) {
return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
}
/**
* @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
* with `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCallWithValue(
address target,
bytes memory data,
uint256 value,
string memory errorMessage
) internal returns (bytes memory) {
require(address(this).balance >= value, "Address: insufficient balance for call");
require(isContract(target), "Address: call to non-contract");
(bool success, bytes memory returndata) = target.call{value: value}(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
return functionStaticCall(target, data, "Address: low-level static call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(
address target,
bytes memory data,
string memory errorMessage
) internal view returns (bytes memory) {
require(isContract(target), "Address: static call to non-contract");
(bool success, bytes memory returndata) = target.staticcall(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
return functionDelegateCall(target, data, "Address: low-level delegate call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
require(isContract(target), "Address: delegate call to non-contract");
(bool success, bytes memory returndata) = target.delegatecall(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
* revert reason using the provided one.
*
* _Available since v4.3._
*/
function verifyCallResult(
bool success,
bytes memory returndata,
string memory errorMessage
) internal pure returns (bytes memory) {
if (success) {
return returndata;
} else {
// Look for revert reason and bubble it up if present
if (returndata.length > 0) {
// The easiest way to bubble the revert reason is using memory via assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../../utils/introspection/IERC165.sol";
/**
* @dev Required interface of an ERC721 compliant contract.
*/
interface IERC721 is IERC165 {
/**
* @dev Emitted when `tokenId` token is transferred from `from` to `to`.
*/
event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
/**
* @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
*/
event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
/**
* @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
*/
event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
/**
* @dev Returns the number of tokens in ``owner``'s account.
*/
function balanceOf(address owner) external view returns (uint256 balance);
/**
* @dev Returns the owner of the `tokenId` token.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function ownerOf(uint256 tokenId) external view returns (address owner);
/**
* @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
* are aware of the ERC721 protocol to prevent tokens from being forever locked.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function safeTransferFrom(
address from,
address to,
uint256 tokenId
) external;
/**
* @dev Transfers `tokenId` token from `from` to `to`.
*
* WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must be owned by `from`.
* - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
*
* Emits a {Transfer} event.
*/
function transferFrom(
address from,
address to,
uint256 tokenId
) external;
/**
* @dev Gives permission to `to` to transfer `tokenId` token to another account.
* The approval is cleared when the token is transferred.
*
* Only a single account can be approved at a time, so approving the zero address clears previous approvals.
*
* Requirements:
*
* - The caller must own the token or be an approved operator.
* - `tokenId` must exist.
*
* Emits an {Approval} event.
*/
function approve(address to, uint256 tokenId) external;
/**
* @dev Returns the account approved for `tokenId` token.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function getApproved(uint256 tokenId) external view returns (address operator);
/**
* @dev Approve or remove `operator` as an operator for the caller.
* Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
*
* Requirements:
*
* - The `operator` cannot be the caller.
*
* Emits an {ApprovalForAll} event.
*/
function setApprovalForAll(address operator, bool _approved) external;
/**
* @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
*
* See {setApprovalForAll}
*/
function isApprovedForAll(address owner, address operator) external view returns (bool);
/**
* @dev Safely transfers `tokenId` token from `from` to `to`.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function safeTransferFrom(
address from,
address to,
uint256 tokenId,
bytes calldata data
) external;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../IERC20.sol";
import "../../../utils/Address.sol";
/**
* @title SafeERC20
* @dev Wrappers around ERC20 operations that throw on failure (when the token
* contract returns false). Tokens that return no value (and instead revert or
* throw on failure) are also supported, non-reverting calls are assumed to be
* successful.
* To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
* which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
*/
library SafeERC20 {
using Address for address;
function safeTransfer(
IERC20 token,
address to,
uint256 value
) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
}
function safeTransferFrom(
IERC20 token,
address from,
address to,
uint256 value
) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
}
/**
* @dev Deprecated. This function has issues similar to the ones found in
* {IERC20-approve}, and its usage is discouraged.
*
* Whenever possible, use {safeIncreaseAllowance} and
* {safeDecreaseAllowance} instead.
*/
function safeApprove(
IERC20 token,
address spender,
uint256 value
) internal {
// safeApprove should only be called when setting an initial allowance,
// or when resetting it to zero. To increase and decrease it, use
// 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
require(
(value == 0) || (token.allowance(address(this), spender) == 0),
"SafeERC20: approve from non-zero to non-zero allowance"
);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
}
function safeIncreaseAllowance(
IERC20 token,
address spender,
uint256 value
) internal {
uint256 newAllowance = token.allowance(address(this), spender) + value;
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
function safeDecreaseAllowance(
IERC20 token,
address spender,
uint256 value
) internal {
unchecked {
uint256 oldAllowance = token.allowance(address(this), spender);
require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
uint256 newAllowance = oldAllowance - value;
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
}
/**
* @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
* on the return value: the return value is optional (but if data is returned, it must not be false).
* @param token The token targeted by the call.
* @param data The call data (encoded using abi.encode or one of its variants).
*/
function _callOptionalReturn(IERC20 token, bytes memory data) private {
// We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
// we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
// the target address contains contract code and also asserts for success in the low-level call.
bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
if (returndata.length > 0) {
// Return data is optional
require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
}
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^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.
*
* IMPORTANT: Beware that changing an allowance with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender's allowance to 0 and set the
* desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
* Emits an {Approval} event.
*/
function approve(address spender, uint256 amount) external returns (bool);
/**
* @dev Moves `amount` tokens from `sender` to `recipient` using the
* allowance mechanism. `amount` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(
address sender,
address recipient,
uint256 amount
) external returns (bool);
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "./IERC165.sol";
/**
* @dev Interface for the NFT Royalty Standard
*/
interface IERC2981 is IERC165 {
/**
* @dev Called with the sale price to determine how much royalty is owed and to whom.
* @param tokenId - the NFT asset queried for royalty information
* @param salePrice - the sale price of the NFT asset specified by `tokenId`
* @return receiver - address of who should be sent the royalty payment
* @return royaltyAmount - the royalty payment amount for `salePrice`
*/
function royaltyInfo(uint256 tokenId, uint256 salePrice)
external
view
returns (address receiver, uint256 royaltyAmount);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../utils/introspection/IERC165.sol";
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @dev Interface of the ERC165 standard, as defined in the
* https://eips.ethereum.org/EIPS/eip-165[EIP].
*
* Implementers can declare support of contract interfaces, which can then be
* queried by others ({ERC165Checker}).
*
* For an implementation, see {ERC165}.
*/
interface IERC165Upgradeable {
/**
* @dev Returns true if this contract implements the interface defined by
* `interfaceId`. See the corresponding
* https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
* 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);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "./IERC165Upgradeable.sol";
import "../../proxy/utils/Initializable.sol";
/**
* @dev Implementation of the {IERC165} interface.
*
* Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
* for the additional interface id that will be supported. For example:
*
* ```solidity
* function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
* return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
* }
* ```
*
* Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
*/
abstract contract ERC165Upgradeable is Initializable, IERC165Upgradeable {
function __ERC165_init() internal initializer {
__ERC165_init_unchained();
}
function __ERC165_init_unchained() internal initializer {
}
/**
* @dev See {IERC165-supportsInterface}.
*/
function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
return interfaceId == type(IERC165Upgradeable).interfaceId;
}
uint256[50] private __gap;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @dev String operations.
*/
library StringsUpgradeable {
bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
/**
* @dev Converts a `uint256` to its ASCII `string` decimal representation.
*/
function toString(uint256 value) internal pure returns (string memory) {
// Inspired by OraclizeAPI's implementation - MIT licence
// https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol
if (value == 0) {
return "0";
}
uint256 temp = value;
uint256 digits;
while (temp != 0) {
digits++;
temp /= 10;
}
bytes memory buffer = new bytes(digits);
while (value != 0) {
digits -= 1;
buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
value /= 10;
}
return string(buffer);
}
/**
* @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
*/
function toHexString(uint256 value) internal pure returns (string memory) {
if (value == 0) {
return "0x00";
}
uint256 temp = value;
uint256 length = 0;
while (temp != 0) {
length++;
temp >>= 8;
}
return toHexString(value, length);
}
/**
* @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
*/
function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
bytes memory buffer = new bytes(2 * length + 2);
buffer[0] = "0";
buffer[1] = "x";
for (uint256 i = 2 * length + 1; i > 1; --i) {
buffer[i] = _HEX_SYMBOLS[value & 0xf];
value >>= 4;
}
require(value == 0, "Strings: hex length insufficient");
return string(buffer);
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../proxy/utils/Initializable.sol";
/**
* @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 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 ContextUpgradeable is Initializable {
function __Context_init() internal initializer {
__Context_init_unchained();
}
function __Context_init_unchained() internal initializer {
}
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
uint256[50] private __gap;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @dev Collection of functions related to the address type
*/
library AddressUpgradeable {
/**
* @dev Returns true if `account` is a contract.
*
* [IMPORTANT]
* ====
* It is unsafe to assume that an address for which this function returns
* false is an externally-owned account (EOA) and not a contract.
*
* Among others, `isContract` will return false for the following
* types of addresses:
*
* - an externally-owned account
* - a contract in construction
* - an address where a contract will be created
* - an address where a contract lived, but was destroyed
* ====
*/
function isContract(address account) internal view returns (bool) {
// This method relies on extcodesize, which returns 0 for contracts in
// construction, since the code is only stored at the end of the
// constructor execution.
uint256 size;
assembly {
size := extcodesize(account)
}
return size > 0;
}
/**
* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
* `recipient`, forwarding all available gas and reverting on errors.
*
* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
* of certain opcodes, possibly making contracts go over the 2300 gas limit
* imposed by `transfer`, making them unable to receive funds via
* `transfer`. {sendValue} removes this limitation.
*
* https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* {ReentrancyGuard} or the
* https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
(bool success, ) = recipient.call{value: amount}("");
require(success, "Address: unable to send value, recipient may have reverted");
}
/**
* @dev Performs a Solidity function call using a low level `call`. A
* plain `call` is an unsafe replacement for a function call: use this
* function instead.
*
* If `target` reverts with a revert reason, it is bubbled up by this
* function (like regular Solidity function calls).
*
* Returns the raw returned data. To convert to the expected return value,
* use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
*
* Requirements:
*
* - `target` must be a contract.
* - calling `target` with `data` must not revert.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
return functionCall(target, data, "Address: low-level call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
* `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
return functionCallWithValue(target, data, 0, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but also transferring `value` wei to `target`.
*
* Requirements:
*
* - the calling contract must have an ETH balance of at least `value`.
* - the called Solidity function must be `payable`.
*
* _Available since v3.1._
*/
function functionCallWithValue(
address target,
bytes memory data,
uint256 value
) internal returns (bytes memory) {
return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
}
/**
* @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
* with `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCallWithValue(
address target,
bytes memory data,
uint256 value,
string memory errorMessage
) internal returns (bytes memory) {
require(address(this).balance >= value, "Address: insufficient balance for call");
require(isContract(target), "Address: call to non-contract");
(bool success, bytes memory returndata) = target.call{value: value}(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
return functionStaticCall(target, data, "Address: low-level static call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(
address target,
bytes memory data,
string memory errorMessage
) internal view returns (bytes memory) {
require(isContract(target), "Address: static call to non-contract");
(bool success, bytes memory returndata) = target.staticcall(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
* revert reason using the provided one.
*
* _Available since v4.3._
*/
function verifyCallResult(
bool success,
bytes memory returndata,
string memory errorMessage
) internal pure returns (bytes memory) {
if (success) {
return returndata;
} else {
// Look for revert reason and bubble it up if present
if (returndata.length > 0) {
// The easiest way to bubble the revert reason is using memory via assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../IERC721Upgradeable.sol";
/**
* @title ERC-721 Non-Fungible Token Standard, optional metadata extension
* @dev See https://eips.ethereum.org/EIPS/eip-721
*/
interface IERC721MetadataUpgradeable is IERC721Upgradeable {
/**
* @dev Returns the token collection name.
*/
function name() external view returns (string memory);
/**
* @dev Returns the token collection symbol.
*/
function symbol() external view returns (string memory);
/**
* @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
*/
function tokenURI(uint256 tokenId) external view returns (string memory);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../../utils/introspection/IERC165Upgradeable.sol";
/**
* @dev Required interface of an ERC721 compliant contract.
*/
interface IERC721Upgradeable is IERC165Upgradeable {
/**
* @dev Emitted when `tokenId` token is transferred from `from` to `to`.
*/
event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
/**
* @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
*/
event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
/**
* @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
*/
event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
/**
* @dev Returns the number of tokens in ``owner``'s account.
*/
function balanceOf(address owner) external view returns (uint256 balance);
/**
* @dev Returns the owner of the `tokenId` token.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function ownerOf(uint256 tokenId) external view returns (address owner);
/**
* @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
* are aware of the ERC721 protocol to prevent tokens from being forever locked.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function safeTransferFrom(
address from,
address to,
uint256 tokenId
) external;
/**
* @dev Transfers `tokenId` token from `from` to `to`.
*
* WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must be owned by `from`.
* - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
*
* Emits a {Transfer} event.
*/
function transferFrom(
address from,
address to,
uint256 tokenId
) external;
/**
* @dev Gives permission to `to` to transfer `tokenId` token to another account.
* The approval is cleared when the token is transferred.
*
* Only a single account can be approved at a time, so approving the zero address clears previous approvals.
*
* Requirements:
*
* - The caller must own the token or be an approved operator.
* - `tokenId` must exist.
*
* Emits an {Approval} event.
*/
function approve(address to, uint256 tokenId) external;
/**
* @dev Returns the account approved for `tokenId` token.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function getApproved(uint256 tokenId) external view returns (address operator);
/**
* @dev Approve or remove `operator` as an operator for the caller.
* Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
*
* Requirements:
*
* - The `operator` cannot be the caller.
*
* Emits an {ApprovalForAll} event.
*/
function setApprovalForAll(address operator, bool _approved) external;
/**
* @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
*
* See {setApprovalForAll}
*/
function isApprovedForAll(address owner, address operator) external view returns (bool);
/**
* @dev Safely transfers `tokenId` token from `from` to `to`.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function safeTransferFrom(
address from,
address to,
uint256 tokenId,
bytes calldata data
) external;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @title ERC721 token receiver interface
* @dev Interface for any contract that wants to support safeTransfers
* from ERC721 asset contracts.
*/
interface IERC721ReceiverUpgradeable {
/**
* @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
* by `operator` from `from`, this function is called.
*
* It must return its Solidity selector to confirm the token transfer.
* If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
*
* The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
*/
function onERC721Received(
address operator,
address from,
uint256 tokenId,
bytes calldata data
) external returns (bytes4);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "./IERC721Upgradeable.sol";
import "./IERC721ReceiverUpgradeable.sol";
import "./extensions/IERC721MetadataUpgradeable.sol";
import "../../utils/AddressUpgradeable.sol";
import "../../utils/ContextUpgradeable.sol";
import "../../utils/StringsUpgradeable.sol";
import "../../utils/introspection/ERC165Upgradeable.sol";
import "../../proxy/utils/Initializable.sol";
/**
* @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
* the Metadata extension, but not including the Enumerable extension, which is available separately as
* {ERC721Enumerable}.
*/
contract ERC721Upgradeable is Initializable, ContextUpgradeable, ERC165Upgradeable, IERC721Upgradeable, IERC721MetadataUpgradeable {
using AddressUpgradeable for address;
using StringsUpgradeable for uint256;
// Token name
string private _name;
// Token symbol
string private _symbol;
// Mapping from token ID to owner address
mapping(uint256 => address) private _owners;
// Mapping owner address to token count
mapping(address => uint256) private _balances;
// Mapping from token ID to approved address
mapping(uint256 => address) private _tokenApprovals;
// Mapping from owner to operator approvals
mapping(address => mapping(address => bool)) private _operatorApprovals;
/**
* @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
*/
function __ERC721_init(string memory name_, string memory symbol_) internal initializer {
__Context_init_unchained();
__ERC165_init_unchained();
__ERC721_init_unchained(name_, symbol_);
}
function __ERC721_init_unchained(string memory name_, string memory symbol_) internal initializer {
_name = name_;
_symbol = symbol_;
}
/**
* @dev See {IERC165-supportsInterface}.
*/
function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165Upgradeable, IERC165Upgradeable) returns (bool) {
return
interfaceId == type(IERC721Upgradeable).interfaceId ||
interfaceId == type(IERC721MetadataUpgradeable).interfaceId ||
super.supportsInterface(interfaceId);
}
/**
* @dev See {IERC721-balanceOf}.
*/
function balanceOf(address owner) public view virtual override returns (uint256) {
require(owner != address(0), "ERC721: balance query for the zero address");
return _balances[owner];
}
/**
* @dev See {IERC721-ownerOf}.
*/
function ownerOf(uint256 tokenId) public view virtual override returns (address) {
address owner = _owners[tokenId];
require(owner != address(0), "ERC721: owner query for nonexistent token");
return owner;
}
/**
* @dev See {IERC721Metadata-name}.
*/
function name() public view virtual override returns (string memory) {
return _name;
}
/**
* @dev See {IERC721Metadata-symbol}.
*/
function symbol() public view virtual override returns (string memory) {
return _symbol;
}
/**
* @dev See {IERC721Metadata-tokenURI}.
*/
function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");
string memory baseURI = _baseURI();
return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : "";
}
/**
* @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
* token will be the concatenation of the `baseURI` and the `tokenId`. Empty
* by default, can be overriden in child contracts.
*/
function _baseURI() internal view virtual returns (string memory) {
return "";
}
/**
* @dev See {IERC721-approve}.
*/
function approve(address to, uint256 tokenId) public virtual override {
address owner = ERC721Upgradeable.ownerOf(tokenId);
require(to != owner, "ERC721: approval to current owner");
require(
_msgSender() == owner || isApprovedForAll(owner, _msgSender()),
"ERC721: approve caller is not owner nor approved for all"
);
_approve(to, tokenId);
}
/**
* @dev See {IERC721-getApproved}.
*/
function getApproved(uint256 tokenId) public view virtual override returns (address) {
require(_exists(tokenId), "ERC721: approved query for nonexistent token");
return _tokenApprovals[tokenId];
}
/**
* @dev See {IERC721-setApprovalForAll}.
*/
function setApprovalForAll(address operator, bool approved) public virtual override {
require(operator != _msgSender(), "ERC721: approve to caller");
_operatorApprovals[_msgSender()][operator] = approved;
emit ApprovalForAll(_msgSender(), operator, approved);
}
/**
* @dev See {IERC721-isApprovedForAll}.
*/
function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
return _operatorApprovals[owner][operator];
}
/**
* @dev See {IERC721-transferFrom}.
*/
function transferFrom(
address from,
address to,
uint256 tokenId
) public virtual override {
//solhint-disable-next-line max-line-length
require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
_transfer(from, to, tokenId);
}
/**
* @dev See {IERC721-safeTransferFrom}.
*/
function safeTransferFrom(
address from,
address to,
uint256 tokenId
) public virtual override {
safeTransferFrom(from, to, tokenId, "");
}
/**
* @dev See {IERC721-safeTransferFrom}.
*/
function safeTransferFrom(
address from,
address to,
uint256 tokenId,
bytes memory _data
) public virtual override {
require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
_safeTransfer(from, to, tokenId, _data);
}
/**
* @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
* are aware of the ERC721 protocol to prevent tokens from being forever locked.
*
* `_data` is additional data, it has no specified format and it is sent in call to `to`.
*
* This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
* implement alternative mechanisms to perform token transfer, such as signature-based.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function _safeTransfer(
address from,
address to,
uint256 tokenId,
bytes memory _data
) internal virtual {
_transfer(from, to, tokenId);
require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
}
/**
* @dev Returns whether `tokenId` exists.
*
* Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
*
* Tokens start existing when they are minted (`_mint`),
* and stop existing when they are burned (`_burn`).
*/
function _exists(uint256 tokenId) internal view virtual returns (bool) {
return _owners[tokenId] != address(0);
}
/**
* @dev Returns whether `spender` is allowed to manage `tokenId`.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
require(_exists(tokenId), "ERC721: operator query for nonexistent token");
address owner = ERC721Upgradeable.ownerOf(tokenId);
return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
}
/**
* @dev Safely mints `tokenId` and transfers it to `to`.
*
* Requirements:
*
* - `tokenId` must not exist.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function _safeMint(address to, uint256 tokenId) internal virtual {
_safeMint(to, tokenId, "");
}
/**
* @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
* forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
*/
function _safeMint(
address to,
uint256 tokenId,
bytes memory _data
) internal virtual {
_mint(to, tokenId);
require(
_checkOnERC721Received(address(0), to, tokenId, _data),
"ERC721: transfer to non ERC721Receiver implementer"
);
}
/**
* @dev Mints `tokenId` and transfers it to `to`.
*
* WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
*
* Requirements:
*
* - `tokenId` must not exist.
* - `to` cannot be the zero address.
*
* Emits a {Transfer} event.
*/
function _mint(address to, uint256 tokenId) internal virtual {
require(to != address(0), "ERC721: mint to the zero address");
require(!_exists(tokenId), "ERC721: token already minted");
_beforeTokenTransfer(address(0), to, tokenId);
_balances[to] += 1;
_owners[tokenId] = to;
emit Transfer(address(0), to, tokenId);
}
/**
* @dev Destroys `tokenId`.
* The approval is cleared when the token is burned.
*
* Requirements:
*
* - `tokenId` must exist.
*
* Emits a {Transfer} event.
*/
function _burn(uint256 tokenId) internal virtual {
address owner = ERC721Upgradeable.ownerOf(tokenId);
_beforeTokenTransfer(owner, address(0), tokenId);
// Clear approvals
_approve(address(0), tokenId);
_balances[owner] -= 1;
delete _owners[tokenId];
emit Transfer(owner, address(0), tokenId);
}
/**
* @dev Transfers `tokenId` from `from` to `to`.
* As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
*
* Requirements:
*
* - `to` cannot be the zero address.
* - `tokenId` token must be owned by `from`.
*
* Emits a {Transfer} event.
*/
function _transfer(
address from,
address to,
uint256 tokenId
) internal virtual {
require(ERC721Upgradeable.ownerOf(tokenId) == from, "ERC721: transfer of token that is not own");
require(to != address(0), "ERC721: transfer to the zero address");
_beforeTokenTransfer(from, to, tokenId);
// Clear approvals from the previous owner
_approve(address(0), tokenId);
_balances[from] -= 1;
_balances[to] += 1;
_owners[tokenId] = to;
emit Transfer(from, to, tokenId);
}
/**
* @dev Approve `to` to operate on `tokenId`
*
* Emits a {Approval} event.
*/
function _approve(address to, uint256 tokenId) internal virtual {
_tokenApprovals[tokenId] = to;
emit Approval(ERC721Upgradeable.ownerOf(tokenId), to, tokenId);
}
/**
* @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
* The call is not executed if the target address is not a contract.
*
* @param from address representing the previous owner of the given token ID
* @param to target address that will receive the tokens
* @param tokenId uint256 ID of the token to be transferred
* @param _data bytes optional data to send along with the call
* @return bool whether the call correctly returned the expected magic value
*/
function _checkOnERC721Received(
address from,
address to,
uint256 tokenId,
bytes memory _data
) private returns (bool) {
if (to.isContract()) {
try IERC721ReceiverUpgradeable(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {
return retval == IERC721ReceiverUpgradeable.onERC721Received.selector;
} catch (bytes memory reason) {
if (reason.length == 0) {
revert("ERC721: transfer to non ERC721Receiver implementer");
} else {
assembly {
revert(add(32, reason), mload(reason))
}
}
}
} else {
return true;
}
}
/**
* @dev Hook that is called before any token transfer. This includes minting
* and burning.
*
* Calling conditions:
*
* - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
* transferred to `to`.
* - When `from` is zero, `tokenId` will be minted for `to`.
* - When `to` is zero, ``from``'s `tokenId` will be burned.
* - `from` and `to` are never both zero.
*
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
*/
function _beforeTokenTransfer(
address from,
address to,
uint256 tokenId
) internal virtual {}
uint256[44] private __gap;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../proxy/utils/Initializable.sol";
/**
* @dev Contract module that helps prevent reentrant calls to a function.
*
* Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
* available, which can be applied to functions to make sure there are no nested
* (reentrant) calls to them.
*
* Note that because there is a single `nonReentrant` guard, functions marked as
* `nonReentrant` may not call one another. This can be worked around by making
* those functions `private`, and then adding `external` `nonReentrant` entry
* points to them.
*
* TIP: If you would like to learn more about reentrancy and alternative ways
* to protect against it, check out our blog post
* https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
*/
abstract contract ReentrancyGuardUpgradeable is Initializable {
// Booleans are more expensive than uint256 or any type that takes up a full
// word because each write operation emits an extra SLOAD to first read the
// slot's contents, replace the bits taken up by the boolean, and then write
// back. This is the compiler's defense against contract upgrades and
// pointer aliasing, and it cannot be disabled.
// The values being non-zero value makes deployment a bit more expensive,
// but in exchange the refund on every call to nonReentrant will be lower in
// amount. Since refunds are capped to a percentage of the total
// transaction's gas, it is best to keep them low in cases like this one, to
// increase the likelihood of the full refund coming into effect.
uint256 private constant _NOT_ENTERED = 1;
uint256 private constant _ENTERED = 2;
uint256 private _status;
function __ReentrancyGuard_init() internal initializer {
__ReentrancyGuard_init_unchained();
}
function __ReentrancyGuard_init_unchained() internal initializer {
_status = _NOT_ENTERED;
}
/**
* @dev Prevents a contract from calling itself, directly or indirectly.
* Calling a `nonReentrant` function from another `nonReentrant`
* function is not supported. It is possible to prevent this from happening
* by making the `nonReentrant` function external, and make it call a
* `private` function that does the actual work.
*/
modifier nonReentrant() {
// On the first call to nonReentrant, _notEntered will be true
require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
// Any calls to nonReentrant after this point will fail
_status = _ENTERED;
_;
// By storing the original value once again, a refund is triggered (see
// https://eips.ethereum.org/EIPS/eip-2200)
_status = _NOT_ENTERED;
}
uint256[49] private __gap;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
* behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an
* external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
* function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
*
* TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
* possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
*
* CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
* that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
*/
abstract contract Initializable {
/**
* @dev Indicates that the contract has been initialized.
*/
bool private _initialized;
/**
* @dev Indicates that the contract is in the process of being initialized.
*/
bool private _initializing;
/**
* @dev Modifier to protect an initializer function from being invoked twice.
*/
modifier initializer() {
require(_initializing || !_initialized, "Initializable: contract is already initialized");
bool isTopLevelCall = !_initializing;
if (isTopLevelCall) {
_initializing = true;
_initialized = true;
}
_;
if (isTopLevelCall) {
_initializing = false;
}
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../utils/ContextUpgradeable.sol";
import "../proxy/utils/Initializable.sol";
/**
* @dev Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* specific functions.
*
* By default, the owner account will be the one that deploys the contract. This
* can later be changed with {transferOwnership}.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be applied to your functions to restrict their use to
* the owner.
*/
abstract contract OwnableUpgradeable is Initializable, ContextUpgradeable {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
function __Ownable_init() internal initializer {
__Context_init_unchained();
__Ownable_init_unchained();
}
function __Ownable_init_unchained() internal initializer {
_setOwner(_msgSender());
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view virtual returns (address) {
return _owner;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(owner() == _msgSender(), "Ownable: caller is not the owner");
_;
}
/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions anymore. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby removing any functionality that is only available to the owner.
*/
function renounceOwnership() public virtual onlyOwner {
_setOwner(address(0));
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
_setOwner(newOwner);
}
function _setOwner(address newOwner) private {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
uint256[49] private __gap;
}
File 2 of 4: GnosisSafeProxy
// 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()) } } } /// @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); /// @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 data Payload for message call sent to new proxy contract. function createProxy(address singleton, bytes memory data) public returns (GnosisSafeProxy proxy) { proxy = new GnosisSafeProxy(singleton); if (data.length > 0) // solhint-disable-next-line no-inline-assembly assembly { if eq(call(gas(), proxy, 0, add(data, 0x20), mload(data), 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 memory initializer, uint256 saltNonce ) internal returns (GnosisSafeProxy proxy) { // 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"); } /// @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 memory initializer, uint256 saltNonce ) public returns (GnosisSafeProxy proxy) { proxy = deployProxyWithNonce(_singleton, initializer, saltNonce); 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) } } emit ProxyCreation(proxy, _singleton); } /// @dev Allows to create new proxy contact, execute a message call to the new proxy and call a specified callback 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. /// @param callback Callback that will be invoced after the new proxy contract has been successfully deployed and initialized. function createProxyWithCallback( address _singleton, bytes memory initializer, uint256 saltNonce, IProxyCreationCallback callback ) public returns (GnosisSafeProxy proxy) { uint256 saltNonceWithCallback = uint256(keccak256(abi.encodePacked(saltNonce, callback))); proxy = createProxyWithNonce(_singleton, initializer, saltNonceWithCallback); if (address(callback) != address(0)) callback.proxyCreated(proxy, _singleton, initializer, saltNonce); } /// @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 ) external returns (GnosisSafeProxy proxy) { proxy = deployProxyWithNonce(_singleton, initializer, saltNonce); revert(string(abi.encodePacked(proxy))); } } interface IProxyCreationCallback { function proxyCreated( GnosisSafeProxy proxy, address _singleton, bytes calldata initializer, uint256 saltNonce ) external; }
File 3 of 4: MetaverseNFT
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;
/**
* @title LICENSE REQUIREMENT
* @dev This contract is licensed under the MIT license.
* @dev You're not allowed to remove DEVELOPER() and DEVELOPER_ADDRESS() from contract
*/
import "@openzeppelin/contracts-upgradeable/token/ERC721/ERC721Upgradeable.sol";
import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/security/ReentrancyGuardUpgradeable.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/utils/Counters.sol";
import "@openzeppelin/contracts/utils/introspection/ERC165Checker.sol";
import "@openzeppelin/contracts/interfaces/IERC2981.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "./extensions/INFTExtension.sol";
import "./IMetaverseNFT.sol";
import "./OpenseaProxy.sol";
// Want to launch your own collection ? Check out https://buildship.dev.
//
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contract MetaverseNFT is
ERC721Upgradeable,
ReentrancyGuardUpgradeable,
OwnableUpgradeable,
IMetaverseNFT // implements IERC2981
{
using Address for address;
using SafeERC20 for IERC20;
using Counters for Counters.Counter;
Counters.Counter private _tokenIdCounter;
uint256 public constant SALE_STARTS_AT_INFINITY = 2**256 - 1;
uint256 public constant DEVELOPER_FEE = 500; // of 10,000 = 5%
uint256 public startTimestamp = SALE_STARTS_AT_INFINITY;
uint256 public createdAt;
uint256 public reserved;
uint256 public maxSupply;
uint256 public maxPerMint;
uint256 public price;
uint256 public royaltyFee;
address public royaltyReceiver;
address public uriExtension = address(0x0);
bool public isFrozen;
bool private isOpenSeaProxyActive;
/**
* @dev Additional data for each token that needs to be stored and accessed on-chain
*/
mapping (uint256 => bytes32) public data;
/**
* @dev List of connected extensions
*/
INFTExtension[] public extensions;
string public PROVENANCE_HASH = "";
string private CONTRACT_URI = "";
string private BASE_URI;
event ExtensionAdded(address indexed extensionAddress);
event ExtensionRevoked(address indexed extensionAddress);
event ExtensionURIAdded(address indexed extensionAddress);
function initialize(
uint256 _price,
uint256 _maxSupply,
uint256 _nReserved,
uint256 _maxPerMint,
uint256 _royaltyFee,
string memory _uri,
string memory _name, string memory _symbol
) public initializer {
__ERC721_init(_name, _symbol);
__ReentrancyGuard_init();
__Ownable_init();
createdAt = block.timestamp;
startTimestamp = SALE_STARTS_AT_INFINITY;
price = _price;
reserved = _nReserved;
maxPerMint = _maxPerMint;
maxSupply = _maxSupply;
royaltyFee = _royaltyFee;
royaltyReceiver = address(this);
// Need help with uploading metadata? Try https://buildship.dev
BASE_URI = _uri;
}
// This constructor ensures that this contract can only be used as a master copy
// Marking constructor as initializer makes sure that real initializer cannot be called
// Thus, as the owner of the contract is 0x0, no one can do anything with the contract
// on the other hand, it's impossible to call this function in proxy,
// so the real initializer is the only initializer
/// @custom:oz-upgrades-unsafe-allow constructor
constructor() initializer {}
function _baseURI() internal view override returns (string memory) {
return BASE_URI;
}
function contractURI() public view returns (string memory uri) {
uri = bytes(CONTRACT_URI).length > 0 ? CONTRACT_URI : _baseURI();
}
function tokenURI(uint256 tokenId) public view override returns (string memory) {
if (uriExtension != address(0)) {
string memory uri = INFTURIExtension(uriExtension).tokenURI(tokenId);
if (bytes(uri).length > 0) {
return uri;
}
}
return super.tokenURI(tokenId);
}
// ----- Admin functions -----
function setBaseURI(string calldata uri) public onlyOwner {
BASE_URI = uri;
}
// Contract-level metadata for Opensea
function setContractURI(string calldata uri) public onlyOwner {
CONTRACT_URI = uri;
}
function setPrice(uint256 _price) public onlyOwner {
price = _price;
}
// Freeze forever, irreversible
function freeze() public onlyOwner {
isFrozen = true;
}
function isExtensionAllowed(address _extension) public view returns (bool) {
if (!ERC165Checker.supportsInterface(_extension, type(INFTExtension).interfaceId)) {
return false;
}
for (uint index = 0; index < extensions.length; index++) {
if (extensions[index] == INFTExtension(_extension)) {
return true;
}
}
return false;
}
// Extensions are allowed to mint
function addExtension(address _extension) public onlyOwner {
require(_extension != address(this), "Cannot add self as extension");
require(!isExtensionAllowed(_extension), "Extension already added");
extensions.push(INFTExtension(_extension));
emit ExtensionAdded(_extension);
}
function revokeExtension(address _extension) public onlyOwner {
uint256 index = 0;
for (; index < extensions.length; index++) {
if (extensions[index] == INFTExtension(_extension)) {
break;
}
}
extensions[index] = extensions[extensions.length - 1];
extensions.pop();
emit ExtensionRevoked(_extension);
}
function setExtensionTokenURI(address extension) public onlyOwner {
require(extension != address(this), "Cannot add self as extension");
require(extension == address(0x0) || ERC165Checker.supportsInterface(extension, type(INFTURIExtension).interfaceId), "Not conforms to extension");
uriExtension = extension;
emit ExtensionURIAdded(extension);
}
// function to disable gasless listings for security in case
// opensea ever shuts down or is compromised
// from CryptoCoven https://etherscan.io/address/0x5180db8f5c931aae63c74266b211f580155ecac8#code
function setIsOpenSeaProxyActive(bool _isOpenSeaProxyActive) public onlyOwner {
isOpenSeaProxyActive = _isOpenSeaProxyActive;
}
// ---- Minting ----
function _mintConsecutive(uint256 nTokens, address to, bytes32 extraData) internal {
require(_tokenIdCounter.current() + nTokens + reserved <= maxSupply, "Not enough Tokens left.");
for (uint256 i; i < nTokens; i++) {
uint256 tokenId = _tokenIdCounter.current();
_tokenIdCounter.increment();
_safeMint(to, tokenId);
data[tokenId] = extraData;
}
}
// ---- Mint control ----
modifier whenSaleStarted() {
require(saleStarted(), "Sale not started");
_;
}
modifier whenNotFrozen() {
require(!isFrozen, "Minting is frozen");
_;
}
modifier onlyExtension() {
require(isExtensionAllowed(msg.sender), "Extension should be added to contract before minting");
_;
}
// ---- Mint public ----
// Contract can sell tokens
function mint(uint256 nTokens) external payable nonReentrant whenSaleStarted {
require(nTokens <= maxPerMint, "You cannot mint more than MAX_TOKENS_PER_MINT tokens at once!");
require(nTokens * price <= msg.value, "Inconsistent amount sent!");
_mintConsecutive(nTokens, msg.sender, 0x0);
}
// Owner can claim free tokens
function claim(uint256 nTokens, address to) external nonReentrant onlyOwner {
require(nTokens <= reserved, "That would exceed the max reserved.");
reserved = reserved - nTokens;
_mintConsecutive(nTokens, to, 0x0);
}
// ---- Mint via extension
function mintExternal(uint256 nTokens, address to, bytes32 extraData) external payable onlyExtension nonReentrant {
_mintConsecutive(nTokens, to, extraData);
}
// ---- Sale control ----
function updateStartTimestamp(uint256 _startTimestamp) public onlyOwner whenNotFrozen {
startTimestamp = _startTimestamp;
}
function startSale() public onlyOwner whenNotFrozen {
startTimestamp = block.timestamp;
}
function stopSale() public onlyOwner {
startTimestamp = SALE_STARTS_AT_INFINITY;
}
function saleStarted() public view returns (bool) {
return block.timestamp >= startTimestamp;
}
// ---- Offchain Info ----
// This should be set before sales open.
function setProvenanceHash(string memory provenanceHash) public onlyOwner {
PROVENANCE_HASH = provenanceHash;
}
function setRoyaltyFee(uint256 _royaltyFee) public onlyOwner {
royaltyFee = _royaltyFee;
}
function setRoyaltyReceiver(address _receiver) public onlyOwner {
require(block.timestamp >= createdAt + 26 weeks, "Only after 6 months of contract creation can the royalty receiver be changed.");
royaltyReceiver = _receiver;
}
function royaltyInfo(uint256, uint256 salePrice) external view returns (address receiver, uint256 royaltyAmount) {
// We use the same contract to split royalties: 5% of royalty goes to the developer
receiver = royaltyReceiver;
royaltyAmount = salePrice * royaltyFee / 10000;
}
// ---- Withdraw -----
function withdraw() public onlyOwner {
uint256 balance = address(this).balance;
uint256 amount = balance * (10000 - DEVELOPER_FEE) / 10000;
address payable dev = DEVELOPER_ADDRESS();
Address.sendValue(payable(msg.sender), amount);
Address.sendValue(dev, balance - amount);
}
function withdrawToken(IERC20 token) public onlyOwner {
uint256 balance = token.balanceOf(address(this));
uint256 amount = balance * (10000 - DEVELOPER_FEE) / 10000;
address payable dev = DEVELOPER_ADDRESS();
token.safeTransfer(payable(msg.sender), amount);
token.safeTransfer(dev, balance - amount);
}
function DEVELOPER() public pure returns (string memory _url) {
_url = "https://buildship.dev";
}
function DEVELOPER_ADDRESS() public pure returns (address payable _dev) {
_dev = payable(0x704C043CeB93bD6cBE570C6A2708c3E1C0310587);
}
// -------- ERC721 overrides --------
function supportsInterface(bytes4 interfaceId)
public
view
override
returns (bool)
{
return interfaceId == type(IERC2981).interfaceId
|| interfaceId == type(IMetaverseNFT).interfaceId
|| super.supportsInterface(interfaceId);
}
/**
* @dev Override isApprovedForAll to allowlist user's OpenSea proxy accounts to enable gas-less listings.
* Taken from CryptoCoven: https://etherscan.io/address/0x5180db8f5c931aae63c74266b211f580155ecac8#code
*/
function isApprovedForAll(address owner, address operator)
public
view
override
returns (bool)
{
// Get a reference to OpenSea's proxy registry contract by instantiating
// the contract using the already existing address.
ProxyRegistry proxyRegistry = ProxyRegistry(0xa5409ec958C83C3f309868babACA7c86DCB077c1);
if (isOpenSeaProxyActive && address(proxyRegistry.proxies(owner)) == operator) {
return true;
}
return super.isApprovedForAll(owner, operator);
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;
import "@openzeppelin/contracts/utils/introspection/IERC165.sol";
interface INFTExtension is IERC165 {
}
interface INFTURIExtension is INFTExtension {
function tokenURI(uint256 tokenId) external view returns (string memory);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;
// These contract definitions are used to create a reference to the OpenSea
// ProxyRegistry contract by using the registry's address (see isApprovedForAll).
interface OwnableDelegateProxy {
}
interface ProxyRegistry {
function proxies(address) external view returns (OwnableDelegateProxy);
}
library SupportsOpensea {
// Use like this:
// if (isOpenSeaProxyActive && SupportsOpensea.isApprovedForAll(owner, operator)) {
// return true;
// }
function isApprovedForAll(address owner, address operator) public view returns (bool) {
// Get a reference to OpenSea's proxy registry contract by instantiating
// the contract using the already existing address.
ProxyRegistry proxyRegistry = ProxyRegistry(0xa5409ec958C83C3f309868babACA7c86DCB077c1);
return address(proxyRegistry.proxies(owner)) == operator;
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;
import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
interface IAvatarNFT {
function DEVELOPER() external pure returns (string memory _url);
function DEVELOPER_ADDRESS() external pure returns (address payable _dev);
// ------ View functions ------
function saleStarted() external view returns (bool);
function isExtensionAllowed(address extension) external view returns (bool);
/**
Extra information stored for each tokenId. Optional, provided on mint
*/
function data(uint256 tokenId) external view returns (bytes32);
// ------ Mint functions ------
/**
Mint from NFTExtension contract. Optionally provide data parameter.
*/
function mintExternal(uint256 nTokens, address to, bytes32 data) external payable;
// ------ Admin functions ------
function addExtension(address extension) external;
function revokeExtension(address extension) external;
function withdraw() external;
}
interface IMetaverseNFT is IAvatarNFT {
// ------ View functions ------
/**
Recommended royalty for tokenId sale.
*/
function royaltyInfo(uint256 tokenId, uint256 salePrice) external view returns (address receiver, uint256 royaltyAmount);
// ------ Admin functions ------
function setRoyaltyReceiver(address receiver) external;
function setRoyaltyFee(uint256 fee) external;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @dev Interface of the ERC165 standard, as defined in the
* https://eips.ethereum.org/EIPS/eip-165[EIP].
*
* Implementers can declare support of contract interfaces, which can then be
* queried by others ({ERC165Checker}).
*
* For an implementation, see {ERC165}.
*/
interface IERC165 {
/**
* @dev Returns true if this contract implements the interface defined by
* `interfaceId`. See the corresponding
* https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
* 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);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "./IERC165.sol";
/**
* @dev Library used to query support of an interface declared via {IERC165}.
*
* Note that these functions return the actual result of the query: they do not
* `revert` if an interface is not supported. It is up to the caller to decide
* what to do in these cases.
*/
library ERC165Checker {
// As per the EIP-165 spec, no interface should ever match 0xffffffff
bytes4 private constant _INTERFACE_ID_INVALID = 0xffffffff;
/**
* @dev Returns true if `account` supports the {IERC165} interface,
*/
function supportsERC165(address account) internal view returns (bool) {
// Any contract that implements ERC165 must explicitly indicate support of
// InterfaceId_ERC165 and explicitly indicate non-support of InterfaceId_Invalid
return
_supportsERC165Interface(account, type(IERC165).interfaceId) &&
!_supportsERC165Interface(account, _INTERFACE_ID_INVALID);
}
/**
* @dev Returns true if `account` supports the interface defined by
* `interfaceId`. Support for {IERC165} itself is queried automatically.
*
* See {IERC165-supportsInterface}.
*/
function supportsInterface(address account, bytes4 interfaceId) internal view returns (bool) {
// query support of both ERC165 as per the spec and support of _interfaceId
return supportsERC165(account) && _supportsERC165Interface(account, interfaceId);
}
/**
* @dev Returns a boolean array where each value corresponds to the
* interfaces passed in and whether they're supported or not. This allows
* you to batch check interfaces for a contract where your expectation
* is that some interfaces may not be supported.
*
* See {IERC165-supportsInterface}.
*
* _Available since v3.4._
*/
function getSupportedInterfaces(address account, bytes4[] memory interfaceIds)
internal
view
returns (bool[] memory)
{
// an array of booleans corresponding to interfaceIds and whether they're supported or not
bool[] memory interfaceIdsSupported = new bool[](interfaceIds.length);
// query support of ERC165 itself
if (supportsERC165(account)) {
// query support of each interface in interfaceIds
for (uint256 i = 0; i < interfaceIds.length; i++) {
interfaceIdsSupported[i] = _supportsERC165Interface(account, interfaceIds[i]);
}
}
return interfaceIdsSupported;
}
/**
* @dev Returns true if `account` supports all the interfaces defined in
* `interfaceIds`. Support for {IERC165} itself is queried automatically.
*
* Batch-querying can lead to gas savings by skipping repeated checks for
* {IERC165} support.
*
* See {IERC165-supportsInterface}.
*/
function supportsAllInterfaces(address account, bytes4[] memory interfaceIds) internal view returns (bool) {
// query support of ERC165 itself
if (!supportsERC165(account)) {
return false;
}
// query support of each interface in _interfaceIds
for (uint256 i = 0; i < interfaceIds.length; i++) {
if (!_supportsERC165Interface(account, interfaceIds[i])) {
return false;
}
}
// all interfaces supported
return true;
}
/**
* @notice Query if a contract implements an interface, does not check ERC165 support
* @param account The address of the contract to query for support of an interface
* @param interfaceId The interface identifier, as specified in ERC-165
* @return true if the contract at account indicates support of the interface with
* identifier interfaceId, false otherwise
* @dev Assumes that account contains a contract that supports ERC165, otherwise
* the behavior of this method is undefined. This precondition can be checked
* with {supportsERC165}.
* Interface identification is specified in ERC-165.
*/
function _supportsERC165Interface(address account, bytes4 interfaceId) private view returns (bool) {
bytes memory encodedParams = abi.encodeWithSelector(IERC165.supportsInterface.selector, interfaceId);
(bool success, bytes memory result) = account.staticcall{gas: 30000}(encodedParams);
if (result.length < 32) return false;
return success && abi.decode(result, (bool));
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @title Counters
* @author Matt Condon (@shrugs)
* @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number
* of elements in a mapping, issuing ERC721 ids, or counting request ids.
*
* Include with `using Counters for Counters.Counter;`
*/
library Counters {
struct Counter {
// This variable should never be directly accessed by users of the library: interactions must be restricted to
// the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
// this feature: see https://github.com/ethereum/solidity/issues/4637
uint256 _value; // default: 0
}
function current(Counter storage counter) internal view returns (uint256) {
return counter._value;
}
function increment(Counter storage counter) internal {
unchecked {
counter._value += 1;
}
}
function decrement(Counter storage counter) internal {
uint256 value = counter._value;
require(value > 0, "Counter: decrement overflow");
unchecked {
counter._value = value - 1;
}
}
function reset(Counter storage counter) internal {
counter._value = 0;
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @dev Collection of functions related to the address type
*/
library Address {
/**
* @dev Returns true if `account` is a contract.
*
* [IMPORTANT]
* ====
* It is unsafe to assume that an address for which this function returns
* false is an externally-owned account (EOA) and not a contract.
*
* Among others, `isContract` will return false for the following
* types of addresses:
*
* - an externally-owned account
* - a contract in construction
* - an address where a contract will be created
* - an address where a contract lived, but was destroyed
* ====
*/
function isContract(address account) internal view returns (bool) {
// This method relies on extcodesize, which returns 0 for contracts in
// construction, since the code is only stored at the end of the
// constructor execution.
uint256 size;
assembly {
size := extcodesize(account)
}
return size > 0;
}
/**
* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
* `recipient`, forwarding all available gas and reverting on errors.
*
* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
* of certain opcodes, possibly making contracts go over the 2300 gas limit
* imposed by `transfer`, making them unable to receive funds via
* `transfer`. {sendValue} removes this limitation.
*
* https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* {ReentrancyGuard} or the
* https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
(bool success, ) = recipient.call{value: amount}("");
require(success, "Address: unable to send value, recipient may have reverted");
}
/**
* @dev Performs a Solidity function call using a low level `call`. A
* plain `call` is an unsafe replacement for a function call: use this
* function instead.
*
* If `target` reverts with a revert reason, it is bubbled up by this
* function (like regular Solidity function calls).
*
* Returns the raw returned data. To convert to the expected return value,
* use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
*
* Requirements:
*
* - `target` must be a contract.
* - calling `target` with `data` must not revert.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
return functionCall(target, data, "Address: low-level call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
* `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
return functionCallWithValue(target, data, 0, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but also transferring `value` wei to `target`.
*
* Requirements:
*
* - the calling contract must have an ETH balance of at least `value`.
* - the called Solidity function must be `payable`.
*
* _Available since v3.1._
*/
function functionCallWithValue(
address target,
bytes memory data,
uint256 value
) internal returns (bytes memory) {
return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
}
/**
* @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
* with `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCallWithValue(
address target,
bytes memory data,
uint256 value,
string memory errorMessage
) internal returns (bytes memory) {
require(address(this).balance >= value, "Address: insufficient balance for call");
require(isContract(target), "Address: call to non-contract");
(bool success, bytes memory returndata) = target.call{value: value}(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
return functionStaticCall(target, data, "Address: low-level static call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(
address target,
bytes memory data,
string memory errorMessage
) internal view returns (bytes memory) {
require(isContract(target), "Address: static call to non-contract");
(bool success, bytes memory returndata) = target.staticcall(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
return functionDelegateCall(target, data, "Address: low-level delegate call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
require(isContract(target), "Address: delegate call to non-contract");
(bool success, bytes memory returndata) = target.delegatecall(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
* revert reason using the provided one.
*
* _Available since v4.3._
*/
function verifyCallResult(
bool success,
bytes memory returndata,
string memory errorMessage
) internal pure returns (bytes memory) {
if (success) {
return returndata;
} else {
// Look for revert reason and bubble it up if present
if (returndata.length > 0) {
// The easiest way to bubble the revert reason is using memory via assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../../utils/introspection/IERC165.sol";
/**
* @dev Required interface of an ERC721 compliant contract.
*/
interface IERC721 is IERC165 {
/**
* @dev Emitted when `tokenId` token is transferred from `from` to `to`.
*/
event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
/**
* @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
*/
event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
/**
* @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
*/
event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
/**
* @dev Returns the number of tokens in ``owner``'s account.
*/
function balanceOf(address owner) external view returns (uint256 balance);
/**
* @dev Returns the owner of the `tokenId` token.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function ownerOf(uint256 tokenId) external view returns (address owner);
/**
* @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
* are aware of the ERC721 protocol to prevent tokens from being forever locked.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function safeTransferFrom(
address from,
address to,
uint256 tokenId
) external;
/**
* @dev Transfers `tokenId` token from `from` to `to`.
*
* WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must be owned by `from`.
* - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
*
* Emits a {Transfer} event.
*/
function transferFrom(
address from,
address to,
uint256 tokenId
) external;
/**
* @dev Gives permission to `to` to transfer `tokenId` token to another account.
* The approval is cleared when the token is transferred.
*
* Only a single account can be approved at a time, so approving the zero address clears previous approvals.
*
* Requirements:
*
* - The caller must own the token or be an approved operator.
* - `tokenId` must exist.
*
* Emits an {Approval} event.
*/
function approve(address to, uint256 tokenId) external;
/**
* @dev Returns the account approved for `tokenId` token.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function getApproved(uint256 tokenId) external view returns (address operator);
/**
* @dev Approve or remove `operator` as an operator for the caller.
* Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
*
* Requirements:
*
* - The `operator` cannot be the caller.
*
* Emits an {ApprovalForAll} event.
*/
function setApprovalForAll(address operator, bool _approved) external;
/**
* @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
*
* See {setApprovalForAll}
*/
function isApprovedForAll(address owner, address operator) external view returns (bool);
/**
* @dev Safely transfers `tokenId` token from `from` to `to`.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function safeTransferFrom(
address from,
address to,
uint256 tokenId,
bytes calldata data
) external;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../IERC20.sol";
import "../../../utils/Address.sol";
/**
* @title SafeERC20
* @dev Wrappers around ERC20 operations that throw on failure (when the token
* contract returns false). Tokens that return no value (and instead revert or
* throw on failure) are also supported, non-reverting calls are assumed to be
* successful.
* To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
* which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
*/
library SafeERC20 {
using Address for address;
function safeTransfer(
IERC20 token,
address to,
uint256 value
) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
}
function safeTransferFrom(
IERC20 token,
address from,
address to,
uint256 value
) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
}
/**
* @dev Deprecated. This function has issues similar to the ones found in
* {IERC20-approve}, and its usage is discouraged.
*
* Whenever possible, use {safeIncreaseAllowance} and
* {safeDecreaseAllowance} instead.
*/
function safeApprove(
IERC20 token,
address spender,
uint256 value
) internal {
// safeApprove should only be called when setting an initial allowance,
// or when resetting it to zero. To increase and decrease it, use
// 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
require(
(value == 0) || (token.allowance(address(this), spender) == 0),
"SafeERC20: approve from non-zero to non-zero allowance"
);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
}
function safeIncreaseAllowance(
IERC20 token,
address spender,
uint256 value
) internal {
uint256 newAllowance = token.allowance(address(this), spender) + value;
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
function safeDecreaseAllowance(
IERC20 token,
address spender,
uint256 value
) internal {
unchecked {
uint256 oldAllowance = token.allowance(address(this), spender);
require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
uint256 newAllowance = oldAllowance - value;
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
}
/**
* @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
* on the return value: the return value is optional (but if data is returned, it must not be false).
* @param token The token targeted by the call.
* @param data The call data (encoded using abi.encode or one of its variants).
*/
function _callOptionalReturn(IERC20 token, bytes memory data) private {
// We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
// we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
// the target address contains contract code and also asserts for success in the low-level call.
bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
if (returndata.length > 0) {
// Return data is optional
require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
}
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^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.
*
* IMPORTANT: Beware that changing an allowance with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender's allowance to 0 and set the
* desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
* Emits an {Approval} event.
*/
function approve(address spender, uint256 amount) external returns (bool);
/**
* @dev Moves `amount` tokens from `sender` to `recipient` using the
* allowance mechanism. `amount` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(
address sender,
address recipient,
uint256 amount
) external returns (bool);
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "./IERC165.sol";
/**
* @dev Interface for the NFT Royalty Standard
*/
interface IERC2981 is IERC165 {
/**
* @dev Called with the sale price to determine how much royalty is owed and to whom.
* @param tokenId - the NFT asset queried for royalty information
* @param salePrice - the sale price of the NFT asset specified by `tokenId`
* @return receiver - address of who should be sent the royalty payment
* @return royaltyAmount - the royalty payment amount for `salePrice`
*/
function royaltyInfo(uint256 tokenId, uint256 salePrice)
external
view
returns (address receiver, uint256 royaltyAmount);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../utils/introspection/IERC165.sol";
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @dev Interface of the ERC165 standard, as defined in the
* https://eips.ethereum.org/EIPS/eip-165[EIP].
*
* Implementers can declare support of contract interfaces, which can then be
* queried by others ({ERC165Checker}).
*
* For an implementation, see {ERC165}.
*/
interface IERC165Upgradeable {
/**
* @dev Returns true if this contract implements the interface defined by
* `interfaceId`. See the corresponding
* https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
* 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);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "./IERC165Upgradeable.sol";
import "../../proxy/utils/Initializable.sol";
/**
* @dev Implementation of the {IERC165} interface.
*
* Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
* for the additional interface id that will be supported. For example:
*
* ```solidity
* function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
* return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
* }
* ```
*
* Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
*/
abstract contract ERC165Upgradeable is Initializable, IERC165Upgradeable {
function __ERC165_init() internal initializer {
__ERC165_init_unchained();
}
function __ERC165_init_unchained() internal initializer {
}
/**
* @dev See {IERC165-supportsInterface}.
*/
function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
return interfaceId == type(IERC165Upgradeable).interfaceId;
}
uint256[50] private __gap;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @dev String operations.
*/
library StringsUpgradeable {
bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
/**
* @dev Converts a `uint256` to its ASCII `string` decimal representation.
*/
function toString(uint256 value) internal pure returns (string memory) {
// Inspired by OraclizeAPI's implementation - MIT licence
// https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol
if (value == 0) {
return "0";
}
uint256 temp = value;
uint256 digits;
while (temp != 0) {
digits++;
temp /= 10;
}
bytes memory buffer = new bytes(digits);
while (value != 0) {
digits -= 1;
buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
value /= 10;
}
return string(buffer);
}
/**
* @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
*/
function toHexString(uint256 value) internal pure returns (string memory) {
if (value == 0) {
return "0x00";
}
uint256 temp = value;
uint256 length = 0;
while (temp != 0) {
length++;
temp >>= 8;
}
return toHexString(value, length);
}
/**
* @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
*/
function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
bytes memory buffer = new bytes(2 * length + 2);
buffer[0] = "0";
buffer[1] = "x";
for (uint256 i = 2 * length + 1; i > 1; --i) {
buffer[i] = _HEX_SYMBOLS[value & 0xf];
value >>= 4;
}
require(value == 0, "Strings: hex length insufficient");
return string(buffer);
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../proxy/utils/Initializable.sol";
/**
* @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 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 ContextUpgradeable is Initializable {
function __Context_init() internal initializer {
__Context_init_unchained();
}
function __Context_init_unchained() internal initializer {
}
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
uint256[50] private __gap;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @dev Collection of functions related to the address type
*/
library AddressUpgradeable {
/**
* @dev Returns true if `account` is a contract.
*
* [IMPORTANT]
* ====
* It is unsafe to assume that an address for which this function returns
* false is an externally-owned account (EOA) and not a contract.
*
* Among others, `isContract` will return false for the following
* types of addresses:
*
* - an externally-owned account
* - a contract in construction
* - an address where a contract will be created
* - an address where a contract lived, but was destroyed
* ====
*/
function isContract(address account) internal view returns (bool) {
// This method relies on extcodesize, which returns 0 for contracts in
// construction, since the code is only stored at the end of the
// constructor execution.
uint256 size;
assembly {
size := extcodesize(account)
}
return size > 0;
}
/**
* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
* `recipient`, forwarding all available gas and reverting on errors.
*
* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
* of certain opcodes, possibly making contracts go over the 2300 gas limit
* imposed by `transfer`, making them unable to receive funds via
* `transfer`. {sendValue} removes this limitation.
*
* https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* {ReentrancyGuard} or the
* https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
(bool success, ) = recipient.call{value: amount}("");
require(success, "Address: unable to send value, recipient may have reverted");
}
/**
* @dev Performs a Solidity function call using a low level `call`. A
* plain `call` is an unsafe replacement for a function call: use this
* function instead.
*
* If `target` reverts with a revert reason, it is bubbled up by this
* function (like regular Solidity function calls).
*
* Returns the raw returned data. To convert to the expected return value,
* use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
*
* Requirements:
*
* - `target` must be a contract.
* - calling `target` with `data` must not revert.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
return functionCall(target, data, "Address: low-level call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
* `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
return functionCallWithValue(target, data, 0, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but also transferring `value` wei to `target`.
*
* Requirements:
*
* - the calling contract must have an ETH balance of at least `value`.
* - the called Solidity function must be `payable`.
*
* _Available since v3.1._
*/
function functionCallWithValue(
address target,
bytes memory data,
uint256 value
) internal returns (bytes memory) {
return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
}
/**
* @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
* with `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCallWithValue(
address target,
bytes memory data,
uint256 value,
string memory errorMessage
) internal returns (bytes memory) {
require(address(this).balance >= value, "Address: insufficient balance for call");
require(isContract(target), "Address: call to non-contract");
(bool success, bytes memory returndata) = target.call{value: value}(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
return functionStaticCall(target, data, "Address: low-level static call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(
address target,
bytes memory data,
string memory errorMessage
) internal view returns (bytes memory) {
require(isContract(target), "Address: static call to non-contract");
(bool success, bytes memory returndata) = target.staticcall(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
* revert reason using the provided one.
*
* _Available since v4.3._
*/
function verifyCallResult(
bool success,
bytes memory returndata,
string memory errorMessage
) internal pure returns (bytes memory) {
if (success) {
return returndata;
} else {
// Look for revert reason and bubble it up if present
if (returndata.length > 0) {
// The easiest way to bubble the revert reason is using memory via assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../IERC721Upgradeable.sol";
/**
* @title ERC-721 Non-Fungible Token Standard, optional metadata extension
* @dev See https://eips.ethereum.org/EIPS/eip-721
*/
interface IERC721MetadataUpgradeable is IERC721Upgradeable {
/**
* @dev Returns the token collection name.
*/
function name() external view returns (string memory);
/**
* @dev Returns the token collection symbol.
*/
function symbol() external view returns (string memory);
/**
* @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
*/
function tokenURI(uint256 tokenId) external view returns (string memory);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../../utils/introspection/IERC165Upgradeable.sol";
/**
* @dev Required interface of an ERC721 compliant contract.
*/
interface IERC721Upgradeable is IERC165Upgradeable {
/**
* @dev Emitted when `tokenId` token is transferred from `from` to `to`.
*/
event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
/**
* @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
*/
event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
/**
* @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
*/
event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
/**
* @dev Returns the number of tokens in ``owner``'s account.
*/
function balanceOf(address owner) external view returns (uint256 balance);
/**
* @dev Returns the owner of the `tokenId` token.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function ownerOf(uint256 tokenId) external view returns (address owner);
/**
* @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
* are aware of the ERC721 protocol to prevent tokens from being forever locked.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function safeTransferFrom(
address from,
address to,
uint256 tokenId
) external;
/**
* @dev Transfers `tokenId` token from `from` to `to`.
*
* WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must be owned by `from`.
* - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
*
* Emits a {Transfer} event.
*/
function transferFrom(
address from,
address to,
uint256 tokenId
) external;
/**
* @dev Gives permission to `to` to transfer `tokenId` token to another account.
* The approval is cleared when the token is transferred.
*
* Only a single account can be approved at a time, so approving the zero address clears previous approvals.
*
* Requirements:
*
* - The caller must own the token or be an approved operator.
* - `tokenId` must exist.
*
* Emits an {Approval} event.
*/
function approve(address to, uint256 tokenId) external;
/**
* @dev Returns the account approved for `tokenId` token.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function getApproved(uint256 tokenId) external view returns (address operator);
/**
* @dev Approve or remove `operator` as an operator for the caller.
* Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
*
* Requirements:
*
* - The `operator` cannot be the caller.
*
* Emits an {ApprovalForAll} event.
*/
function setApprovalForAll(address operator, bool _approved) external;
/**
* @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
*
* See {setApprovalForAll}
*/
function isApprovedForAll(address owner, address operator) external view returns (bool);
/**
* @dev Safely transfers `tokenId` token from `from` to `to`.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function safeTransferFrom(
address from,
address to,
uint256 tokenId,
bytes calldata data
) external;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @title ERC721 token receiver interface
* @dev Interface for any contract that wants to support safeTransfers
* from ERC721 asset contracts.
*/
interface IERC721ReceiverUpgradeable {
/**
* @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
* by `operator` from `from`, this function is called.
*
* It must return its Solidity selector to confirm the token transfer.
* If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
*
* The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
*/
function onERC721Received(
address operator,
address from,
uint256 tokenId,
bytes calldata data
) external returns (bytes4);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "./IERC721Upgradeable.sol";
import "./IERC721ReceiverUpgradeable.sol";
import "./extensions/IERC721MetadataUpgradeable.sol";
import "../../utils/AddressUpgradeable.sol";
import "../../utils/ContextUpgradeable.sol";
import "../../utils/StringsUpgradeable.sol";
import "../../utils/introspection/ERC165Upgradeable.sol";
import "../../proxy/utils/Initializable.sol";
/**
* @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
* the Metadata extension, but not including the Enumerable extension, which is available separately as
* {ERC721Enumerable}.
*/
contract ERC721Upgradeable is Initializable, ContextUpgradeable, ERC165Upgradeable, IERC721Upgradeable, IERC721MetadataUpgradeable {
using AddressUpgradeable for address;
using StringsUpgradeable for uint256;
// Token name
string private _name;
// Token symbol
string private _symbol;
// Mapping from token ID to owner address
mapping(uint256 => address) private _owners;
// Mapping owner address to token count
mapping(address => uint256) private _balances;
// Mapping from token ID to approved address
mapping(uint256 => address) private _tokenApprovals;
// Mapping from owner to operator approvals
mapping(address => mapping(address => bool)) private _operatorApprovals;
/**
* @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
*/
function __ERC721_init(string memory name_, string memory symbol_) internal initializer {
__Context_init_unchained();
__ERC165_init_unchained();
__ERC721_init_unchained(name_, symbol_);
}
function __ERC721_init_unchained(string memory name_, string memory symbol_) internal initializer {
_name = name_;
_symbol = symbol_;
}
/**
* @dev See {IERC165-supportsInterface}.
*/
function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165Upgradeable, IERC165Upgradeable) returns (bool) {
return
interfaceId == type(IERC721Upgradeable).interfaceId ||
interfaceId == type(IERC721MetadataUpgradeable).interfaceId ||
super.supportsInterface(interfaceId);
}
/**
* @dev See {IERC721-balanceOf}.
*/
function balanceOf(address owner) public view virtual override returns (uint256) {
require(owner != address(0), "ERC721: balance query for the zero address");
return _balances[owner];
}
/**
* @dev See {IERC721-ownerOf}.
*/
function ownerOf(uint256 tokenId) public view virtual override returns (address) {
address owner = _owners[tokenId];
require(owner != address(0), "ERC721: owner query for nonexistent token");
return owner;
}
/**
* @dev See {IERC721Metadata-name}.
*/
function name() public view virtual override returns (string memory) {
return _name;
}
/**
* @dev See {IERC721Metadata-symbol}.
*/
function symbol() public view virtual override returns (string memory) {
return _symbol;
}
/**
* @dev See {IERC721Metadata-tokenURI}.
*/
function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");
string memory baseURI = _baseURI();
return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : "";
}
/**
* @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
* token will be the concatenation of the `baseURI` and the `tokenId`. Empty
* by default, can be overriden in child contracts.
*/
function _baseURI() internal view virtual returns (string memory) {
return "";
}
/**
* @dev See {IERC721-approve}.
*/
function approve(address to, uint256 tokenId) public virtual override {
address owner = ERC721Upgradeable.ownerOf(tokenId);
require(to != owner, "ERC721: approval to current owner");
require(
_msgSender() == owner || isApprovedForAll(owner, _msgSender()),
"ERC721: approve caller is not owner nor approved for all"
);
_approve(to, tokenId);
}
/**
* @dev See {IERC721-getApproved}.
*/
function getApproved(uint256 tokenId) public view virtual override returns (address) {
require(_exists(tokenId), "ERC721: approved query for nonexistent token");
return _tokenApprovals[tokenId];
}
/**
* @dev See {IERC721-setApprovalForAll}.
*/
function setApprovalForAll(address operator, bool approved) public virtual override {
require(operator != _msgSender(), "ERC721: approve to caller");
_operatorApprovals[_msgSender()][operator] = approved;
emit ApprovalForAll(_msgSender(), operator, approved);
}
/**
* @dev See {IERC721-isApprovedForAll}.
*/
function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
return _operatorApprovals[owner][operator];
}
/**
* @dev See {IERC721-transferFrom}.
*/
function transferFrom(
address from,
address to,
uint256 tokenId
) public virtual override {
//solhint-disable-next-line max-line-length
require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
_transfer(from, to, tokenId);
}
/**
* @dev See {IERC721-safeTransferFrom}.
*/
function safeTransferFrom(
address from,
address to,
uint256 tokenId
) public virtual override {
safeTransferFrom(from, to, tokenId, "");
}
/**
* @dev See {IERC721-safeTransferFrom}.
*/
function safeTransferFrom(
address from,
address to,
uint256 tokenId,
bytes memory _data
) public virtual override {
require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
_safeTransfer(from, to, tokenId, _data);
}
/**
* @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
* are aware of the ERC721 protocol to prevent tokens from being forever locked.
*
* `_data` is additional data, it has no specified format and it is sent in call to `to`.
*
* This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
* implement alternative mechanisms to perform token transfer, such as signature-based.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function _safeTransfer(
address from,
address to,
uint256 tokenId,
bytes memory _data
) internal virtual {
_transfer(from, to, tokenId);
require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
}
/**
* @dev Returns whether `tokenId` exists.
*
* Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
*
* Tokens start existing when they are minted (`_mint`),
* and stop existing when they are burned (`_burn`).
*/
function _exists(uint256 tokenId) internal view virtual returns (bool) {
return _owners[tokenId] != address(0);
}
/**
* @dev Returns whether `spender` is allowed to manage `tokenId`.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
require(_exists(tokenId), "ERC721: operator query for nonexistent token");
address owner = ERC721Upgradeable.ownerOf(tokenId);
return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
}
/**
* @dev Safely mints `tokenId` and transfers it to `to`.
*
* Requirements:
*
* - `tokenId` must not exist.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function _safeMint(address to, uint256 tokenId) internal virtual {
_safeMint(to, tokenId, "");
}
/**
* @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
* forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
*/
function _safeMint(
address to,
uint256 tokenId,
bytes memory _data
) internal virtual {
_mint(to, tokenId);
require(
_checkOnERC721Received(address(0), to, tokenId, _data),
"ERC721: transfer to non ERC721Receiver implementer"
);
}
/**
* @dev Mints `tokenId` and transfers it to `to`.
*
* WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
*
* Requirements:
*
* - `tokenId` must not exist.
* - `to` cannot be the zero address.
*
* Emits a {Transfer} event.
*/
function _mint(address to, uint256 tokenId) internal virtual {
require(to != address(0), "ERC721: mint to the zero address");
require(!_exists(tokenId), "ERC721: token already minted");
_beforeTokenTransfer(address(0), to, tokenId);
_balances[to] += 1;
_owners[tokenId] = to;
emit Transfer(address(0), to, tokenId);
}
/**
* @dev Destroys `tokenId`.
* The approval is cleared when the token is burned.
*
* Requirements:
*
* - `tokenId` must exist.
*
* Emits a {Transfer} event.
*/
function _burn(uint256 tokenId) internal virtual {
address owner = ERC721Upgradeable.ownerOf(tokenId);
_beforeTokenTransfer(owner, address(0), tokenId);
// Clear approvals
_approve(address(0), tokenId);
_balances[owner] -= 1;
delete _owners[tokenId];
emit Transfer(owner, address(0), tokenId);
}
/**
* @dev Transfers `tokenId` from `from` to `to`.
* As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
*
* Requirements:
*
* - `to` cannot be the zero address.
* - `tokenId` token must be owned by `from`.
*
* Emits a {Transfer} event.
*/
function _transfer(
address from,
address to,
uint256 tokenId
) internal virtual {
require(ERC721Upgradeable.ownerOf(tokenId) == from, "ERC721: transfer of token that is not own");
require(to != address(0), "ERC721: transfer to the zero address");
_beforeTokenTransfer(from, to, tokenId);
// Clear approvals from the previous owner
_approve(address(0), tokenId);
_balances[from] -= 1;
_balances[to] += 1;
_owners[tokenId] = to;
emit Transfer(from, to, tokenId);
}
/**
* @dev Approve `to` to operate on `tokenId`
*
* Emits a {Approval} event.
*/
function _approve(address to, uint256 tokenId) internal virtual {
_tokenApprovals[tokenId] = to;
emit Approval(ERC721Upgradeable.ownerOf(tokenId), to, tokenId);
}
/**
* @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
* The call is not executed if the target address is not a contract.
*
* @param from address representing the previous owner of the given token ID
* @param to target address that will receive the tokens
* @param tokenId uint256 ID of the token to be transferred
* @param _data bytes optional data to send along with the call
* @return bool whether the call correctly returned the expected magic value
*/
function _checkOnERC721Received(
address from,
address to,
uint256 tokenId,
bytes memory _data
) private returns (bool) {
if (to.isContract()) {
try IERC721ReceiverUpgradeable(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {
return retval == IERC721ReceiverUpgradeable.onERC721Received.selector;
} catch (bytes memory reason) {
if (reason.length == 0) {
revert("ERC721: transfer to non ERC721Receiver implementer");
} else {
assembly {
revert(add(32, reason), mload(reason))
}
}
}
} else {
return true;
}
}
/**
* @dev Hook that is called before any token transfer. This includes minting
* and burning.
*
* Calling conditions:
*
* - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
* transferred to `to`.
* - When `from` is zero, `tokenId` will be minted for `to`.
* - When `to` is zero, ``from``'s `tokenId` will be burned.
* - `from` and `to` are never both zero.
*
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
*/
function _beforeTokenTransfer(
address from,
address to,
uint256 tokenId
) internal virtual {}
uint256[44] private __gap;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../proxy/utils/Initializable.sol";
/**
* @dev Contract module that helps prevent reentrant calls to a function.
*
* Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
* available, which can be applied to functions to make sure there are no nested
* (reentrant) calls to them.
*
* Note that because there is a single `nonReentrant` guard, functions marked as
* `nonReentrant` may not call one another. This can be worked around by making
* those functions `private`, and then adding `external` `nonReentrant` entry
* points to them.
*
* TIP: If you would like to learn more about reentrancy and alternative ways
* to protect against it, check out our blog post
* https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
*/
abstract contract ReentrancyGuardUpgradeable is Initializable {
// Booleans are more expensive than uint256 or any type that takes up a full
// word because each write operation emits an extra SLOAD to first read the
// slot's contents, replace the bits taken up by the boolean, and then write
// back. This is the compiler's defense against contract upgrades and
// pointer aliasing, and it cannot be disabled.
// The values being non-zero value makes deployment a bit more expensive,
// but in exchange the refund on every call to nonReentrant will be lower in
// amount. Since refunds are capped to a percentage of the total
// transaction's gas, it is best to keep them low in cases like this one, to
// increase the likelihood of the full refund coming into effect.
uint256 private constant _NOT_ENTERED = 1;
uint256 private constant _ENTERED = 2;
uint256 private _status;
function __ReentrancyGuard_init() internal initializer {
__ReentrancyGuard_init_unchained();
}
function __ReentrancyGuard_init_unchained() internal initializer {
_status = _NOT_ENTERED;
}
/**
* @dev Prevents a contract from calling itself, directly or indirectly.
* Calling a `nonReentrant` function from another `nonReentrant`
* function is not supported. It is possible to prevent this from happening
* by making the `nonReentrant` function external, and make it call a
* `private` function that does the actual work.
*/
modifier nonReentrant() {
// On the first call to nonReentrant, _notEntered will be true
require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
// Any calls to nonReentrant after this point will fail
_status = _ENTERED;
_;
// By storing the original value once again, a refund is triggered (see
// https://eips.ethereum.org/EIPS/eip-2200)
_status = _NOT_ENTERED;
}
uint256[49] private __gap;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
* behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an
* external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
* function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
*
* TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
* possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
*
* CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
* that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
*/
abstract contract Initializable {
/**
* @dev Indicates that the contract has been initialized.
*/
bool private _initialized;
/**
* @dev Indicates that the contract is in the process of being initialized.
*/
bool private _initializing;
/**
* @dev Modifier to protect an initializer function from being invoked twice.
*/
modifier initializer() {
require(_initializing || !_initialized, "Initializable: contract is already initialized");
bool isTopLevelCall = !_initializing;
if (isTopLevelCall) {
_initializing = true;
_initialized = true;
}
_;
if (isTopLevelCall) {
_initializing = false;
}
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../utils/ContextUpgradeable.sol";
import "../proxy/utils/Initializable.sol";
/**
* @dev Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* specific functions.
*
* By default, the owner account will be the one that deploys the contract. This
* can later be changed with {transferOwnership}.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be applied to your functions to restrict their use to
* the owner.
*/
abstract contract OwnableUpgradeable is Initializable, ContextUpgradeable {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
function __Ownable_init() internal initializer {
__Context_init_unchained();
__Ownable_init_unchained();
}
function __Ownable_init_unchained() internal initializer {
_setOwner(_msgSender());
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view virtual returns (address) {
return _owner;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(owner() == _msgSender(), "Ownable: caller is not the owner");
_;
}
/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions anymore. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby removing any functionality that is only available to the owner.
*/
function renounceOwnership() public virtual onlyOwner {
_setOwner(address(0));
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
_setOwner(newOwner);
}
function _setOwner(address newOwner) private {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
uint256[49] private __gap;
}
File 4 of 4: GnosisSafe
// 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/EtherPaymentFallback.sol"; import "./common/Singleton.sol"; import "./common/SignatureDecoder.sol"; import "./common/SecuredTokenTransfer.sol"; import "./common/StorageAccessible.sol"; import "./interfaces/ISignatureValidator.sol"; import "./external/GnosisSafeMath.sol"; /// @title Gnosis Safe - A multisignature wallet with support for confirmations using signed messages based on ERC191. /// @author Stefan George - <[email protected]> /// @author Richard Meissner - <[email protected]> contract GnosisSafe is EtherPaymentFallback, Singleton, ModuleManager, OwnerManager, SignatureDecoder, SecuredTokenTransfer, ISignatureValidatorConstants, FallbackManager, StorageAccessible, GuardManager { using GnosisSafeMath for uint256; string public constant VERSION = "1.3.0"; // keccak256( // "EIP712Domain(uint256 chainId,address verifyingContract)" // ); bytes32 private constant DOMAIN_SEPARATOR_TYPEHASH = 0x47e79534a245952e8b16893a336b85a3d9ea9fa8c573f3d803afb92a79469218; // keccak256( // "SafeTx(address to,uint256 value,bytes data,uint8 operation,uint256 safeTxGas,uint256 baseGas,uint256 gasPrice,address gasToken,address refundReceiver,uint256 nonce)" // ); bytes32 private constant SAFE_TX_TYPEHASH = 0xbb8310d486368db6bd6f849402fdd73ad53d316b5a4b2644ad6efe0f941286d8; event SafeSetup(address indexed initiator, address[] owners, uint256 threshold, address initializer, address fallbackHandler); event ApproveHash(bytes32 indexed approvedHash, address indexed owner); event SignMsg(bytes32 indexed msgHash); event ExecutionFailure(bytes32 txHash, uint256 payment); event ExecutionSuccess(bytes32 txHash, uint256 payment); uint256 public nonce; bytes32 private _deprecatedDomainSeparator; // Mapping to keep track of all message hashes that have been approve by ALL REQUIRED owners mapping(bytes32 => uint256) public signedMessages; // Mapping to keep track of all hashes (message or transaction) that have been approve by ANY owners mapping(address => mapping(bytes32 => uint256)) public approvedHashes; // This constructor ensures that this contract can only be used as a master copy for Proxy contracts constructor() { // By setting the threshold it is not possible to call setup anymore, // so we create a Safe with 0 owners and threshold 1. // This is an unusable Safe, perfect for the singleton threshold = 1; } /// @dev Setup function sets initial storage of contract. /// @param _owners List of Safe owners. /// @param _threshold Number of required confirmations for a Safe transaction. /// @param to Contract address for optional delegate call. /// @param data Data payload for optional delegate call. /// @param fallbackHandler Handler for fallback calls to this contract /// @param paymentToken Token that should be used for the payment (0 is ETH) /// @param payment Value that should be paid /// @param paymentReceiver Adddress that should receive the payment (or 0 if tx.origin) function setup( address[] calldata _owners, uint256 _threshold, address to, bytes calldata data, address fallbackHandler, address paymentToken, uint256 payment, address payable paymentReceiver ) external { // setupOwners checks if the Threshold is already set, therefore preventing that this method is called twice setupOwners(_owners, _threshold); if (fallbackHandler != address(0)) internalSetFallbackHandler(fallbackHandler); // As setupOwners can only be called if the contract has not been initialized we don't need a check for setupModules setupModules(to, data); if (payment > 0) { // To avoid running into issues with EIP-170 we reuse the handlePayment function (to avoid adjusting code of that has been verified we do not adjust the method itself) // baseGas = 0, gasPrice = 1 and gas = payment => amount = (payment + 0) * 1 = payment handlePayment(payment, 0, 1, paymentToken, paymentReceiver); } emit SafeSetup(msg.sender, _owners, _threshold, to, fallbackHandler); } /// @dev Allows to execute a Safe transaction confirmed by required number of owners and then pays the account that submitted the transaction. /// Note: The fees are always transferred, even if the user transaction fails. /// @param to Destination address of Safe transaction. /// @param value Ether value of Safe transaction. /// @param data Data payload of Safe transaction. /// @param operation Operation type of Safe transaction. /// @param safeTxGas Gas that should be used for the Safe transaction. /// @param baseGas Gas costs that are independent of the transaction execution(e.g. base transaction fee, signature check, payment of the refund) /// @param gasPrice Gas price that should be used for the payment calculation. /// @param gasToken Token address (or 0 if ETH) that is used for the payment. /// @param refundReceiver Address of receiver of gas payment (or 0 if tx.origin). /// @param signatures Packed signature data ({bytes32 r}{bytes32 s}{uint8 v}) function execTransaction( address to, uint256 value, bytes calldata data, Enum.Operation operation, uint256 safeTxGas, uint256 baseGas, uint256 gasPrice, address gasToken, address payable refundReceiver, bytes memory signatures ) public payable virtual returns (bool success) { bytes32 txHash; // Use scope here to limit variable lifetime and prevent `stack too deep` errors { bytes memory txHashData = encodeTransactionData( // Transaction info to, value, data, operation, safeTxGas, // Payment info baseGas, gasPrice, gasToken, refundReceiver, // Signature info nonce ); // Increase nonce and execute transaction. nonce++; txHash = keccak256(txHashData); checkSignatures(txHash, txHashData, signatures); } address guard = getGuard(); { if (guard != address(0)) { Guard(guard).checkTransaction( // Transaction info to, value, data, operation, safeTxGas, // Payment info baseGas, gasPrice, gasToken, refundReceiver, // Signature info signatures, msg.sender ); } } // We require some gas to emit the events (at least 2500) after the execution and some to perform code until the execution (500) // We also include the 1/64 in the check that is not send along with a call to counteract potential shortings because of EIP-150 require(gasleft() >= ((safeTxGas * 64) / 63).max(safeTxGas + 2500) + 500, "GS010"); // Use scope here to limit variable lifetime and prevent `stack too deep` errors { uint256 gasUsed = gasleft(); // If the gasPrice is 0 we assume that nearly all available gas can be used (it is always more than safeTxGas) // We only substract 2500 (compared to the 3000 before) to ensure that the amount passed is still higher than safeTxGas success = execute(to, value, data, operation, gasPrice == 0 ? (gasleft() - 2500) : safeTxGas); gasUsed = gasUsed.sub(gasleft()); // If no safeTxGas and no gasPrice was set (e.g. both are 0), then the internal tx is required to be successful // This makes it possible to use `estimateGas` without issues, as it searches for the minimum gas where the tx doesn't revert require(success || safeTxGas != 0 || gasPrice != 0, "GS013"); // We transfer the calculated tx costs to the tx.origin to avoid sending it to intermediate contracts that have made calls uint256 payment = 0; if (gasPrice > 0) { payment = handlePayment(gasUsed, baseGas, gasPrice, gasToken, refundReceiver); } if (success) emit ExecutionSuccess(txHash, payment); else emit ExecutionFailure(txHash, payment); } { if (guard != address(0)) { Guard(guard).checkAfterExecution(txHash, success); } } } function handlePayment( uint256 gasUsed, uint256 baseGas, uint256 gasPrice, address gasToken, address payable refundReceiver ) private returns (uint256 payment) { // solhint-disable-next-line avoid-tx-origin address payable receiver = refundReceiver == address(0) ? payable(tx.origin) : refundReceiver; if (gasToken == address(0)) { // For ETH we will only adjust the gas price to not be higher than the actual used gas price payment = gasUsed.add(baseGas).mul(gasPrice < tx.gasprice ? gasPrice : tx.gasprice); require(receiver.send(payment), "GS011"); } else { payment = gasUsed.add(baseGas).mul(gasPrice); require(transferToken(gasToken, receiver, payment), "GS012"); } } /** * @dev Checks whether the signature provided is valid for the provided data, hash. Will revert otherwise. * @param dataHash Hash of the data (could be either a message hash or transaction hash) * @param data That should be signed (this is passed to an external validator contract) * @param signatures Signature data that should be verified. Can be ECDSA signature, contract signature (EIP-1271) or approved hash. */ function checkSignatures( bytes32 dataHash, bytes memory data, bytes memory signatures ) public view { // Load threshold to avoid multiple storage loads uint256 _threshold = threshold; // Check that a threshold is set require(_threshold > 0, "GS001"); checkNSignatures(dataHash, data, signatures, _threshold); } /** * @dev Checks whether the signature provided is valid for the provided data, hash. Will revert otherwise. * @param dataHash Hash of the data (could be either a message hash or transaction hash) * @param data That should be signed (this is passed to an external validator contract) * @param signatures Signature data that should be verified. Can be ECDSA signature, contract signature (EIP-1271) or approved hash. * @param requiredSignatures Amount of required valid signatures. */ function checkNSignatures( bytes32 dataHash, bytes memory data, bytes memory signatures, uint256 requiredSignatures ) public view { // Check that the provided signature data is not too short require(signatures.length >= requiredSignatures.mul(65), "GS020"); // There cannot be an owner with address 0. address lastOwner = address(0); address currentOwner; uint8 v; bytes32 r; bytes32 s; uint256 i; for (i = 0; i < requiredSignatures; i++) { (v, r, s) = signatureSplit(signatures, i); if (v == 0) { // If v is 0 then it is a contract signature // When handling contract signatures the address of the contract is encoded into r currentOwner = address(uint160(uint256(r))); // Check that signature data pointer (s) is not pointing inside the static part of the signatures bytes // This check is not completely accurate, since it is possible that more signatures than the threshold are send. // Here we only check that the pointer is not pointing inside the part that is being processed require(uint256(s) >= requiredSignatures.mul(65), "GS021"); // Check that signature data pointer (s) is in bounds (points to the length of data -> 32 bytes) require(uint256(s).add(32) <= signatures.length, "GS022"); // Check if the contract signature is in bounds: start of data is s + 32 and end is start + signature length uint256 contractSignatureLen; // solhint-disable-next-line no-inline-assembly assembly { contractSignatureLen := mload(add(add(signatures, s), 0x20)) } require(uint256(s).add(32).add(contractSignatureLen) <= signatures.length, "GS023"); // Check signature bytes memory contractSignature; // solhint-disable-next-line no-inline-assembly assembly { // The signature data for contract signatures is appended to the concatenated signatures and the offset is stored in s contractSignature := add(add(signatures, s), 0x20) } require(ISignatureValidator(currentOwner).isValidSignature(data, contractSignature) == EIP1271_MAGIC_VALUE, "GS024"); } else if (v == 1) { // If v is 1 then it is an approved hash // When handling approved hashes the address of the approver is encoded into r currentOwner = address(uint160(uint256(r))); // Hashes are automatically approved by the sender of the message or when they have been pre-approved via a separate transaction require(msg.sender == currentOwner || approvedHashes[currentOwner][dataHash] != 0, "GS025"); } else if (v > 30) { // If v > 30 then default va (27,28) has been adjusted for eth_sign flow // To support eth_sign and similar we adjust v and hash the messageHash with the Ethereum message prefix before applying ecrecover currentOwner = ecrecover(keccak256(abi.encodePacked("\\x19Ethereum Signed Message:\ 32", dataHash)), v - 4, r, s); } else { // Default is the ecrecover flow with the provided data hash // Use ecrecover with the messageHash for EOA signatures currentOwner = ecrecover(dataHash, v, r, s); } require(currentOwner > lastOwner && owners[currentOwner] != address(0) && currentOwner != SENTINEL_OWNERS, "GS026"); lastOwner = currentOwner; } } /// @dev Allows to estimate a Safe transaction. /// This method is only meant for estimation purpose, therefore the call will always revert and encode the result in the revert data. /// Since the `estimateGas` function includes refunds, call this method to get an estimated of the costs that are deducted from the safe with `execTransaction` /// @param to Destination address of Safe transaction. /// @param value Ether value of Safe transaction. /// @param data Data payload of Safe transaction. /// @param operation Operation type of Safe transaction. /// @return Estimate without refunds and overhead fees (base transaction and payload data gas costs). /// @notice Deprecated in favor of common/StorageAccessible.sol and will be removed in next version. function requiredTxGas( address to, uint256 value, bytes calldata data, Enum.Operation operation ) external returns (uint256) { uint256 startGas = gasleft(); // We don't provide an error message here, as we use it to return the estimate require(execute(to, value, data, operation, gasleft())); uint256 requiredGas = startGas - gasleft(); // Convert response to string and return via error message revert(string(abi.encodePacked(requiredGas))); } /** * @dev Marks a hash as approved. This can be used to validate a hash that is used by a signature. * @param hashToApprove The hash that should be marked as approved for signatures that are verified by this contract. */ function approveHash(bytes32 hashToApprove) external { require(owners[msg.sender] != address(0), "GS030"); approvedHashes[msg.sender][hashToApprove] = 1; emit ApproveHash(hashToApprove, msg.sender); } /// @dev Returns the chain id used by this contract. function getChainId() public view returns (uint256) { uint256 id; // solhint-disable-next-line no-inline-assembly assembly { id := chainid() } return id; } function domainSeparator() public view returns (bytes32) { return keccak256(abi.encode(DOMAIN_SEPARATOR_TYPEHASH, getChainId(), this)); } /// @dev Returns the bytes that are hashed to be signed by owners. /// @param to Destination address. /// @param value Ether value. /// @param data Data payload. /// @param operation Operation type. /// @param safeTxGas Gas that should be used for the safe transaction. /// @param baseGas Gas costs for that are independent of the transaction execution(e.g. base transaction fee, signature check, payment of the refund) /// @param gasPrice Maximum gas price that should be used for this transaction. /// @param gasToken Token address (or 0 if ETH) that is used for the payment. /// @param refundReceiver Address of receiver of gas payment (or 0 if tx.origin). /// @param _nonce Transaction nonce. /// @return Transaction hash bytes. function encodeTransactionData( address to, uint256 value, bytes calldata data, Enum.Operation operation, uint256 safeTxGas, uint256 baseGas, uint256 gasPrice, address gasToken, address refundReceiver, uint256 _nonce ) public view returns (bytes memory) { bytes32 safeTxHash = keccak256( abi.encode( SAFE_TX_TYPEHASH, to, value, keccak256(data), operation, safeTxGas, baseGas, gasPrice, gasToken, refundReceiver, _nonce ) ); return abi.encodePacked(bytes1(0x19), bytes1(0x01), domainSeparator(), safeTxHash); } /// @dev Returns hash to be signed by owners. /// @param to Destination address. /// @param value Ether value. /// @param data Data payload. /// @param operation Operation type. /// @param safeTxGas Fas that should be used for the safe transaction. /// @param baseGas Gas costs for data used to trigger the safe transaction. /// @param gasPrice Maximum gas price that should be used for this transaction. /// @param gasToken Token address (or 0 if ETH) that is used for the payment. /// @param refundReceiver Address of receiver of gas payment (or 0 if tx.origin). /// @param _nonce Transaction nonce. /// @return Transaction hash. function getTransactionHash( address to, uint256 value, bytes calldata data, Enum.Operation operation, uint256 safeTxGas, uint256 baseGas, uint256 gasPrice, address gasToken, address refundReceiver, uint256 _nonce ) public view returns (bytes32) { return keccak256(encodeTransactionData(to, value, data, operation, safeTxGas, baseGas, gasPrice, gasToken, refundReceiver, _nonce)); } } // 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 - <[email protected]> contract Executor { 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) } } } } // SPDX-License-Identifier: LGPL-3.0-only pragma solidity >=0.7.0 <0.9.0; import "../common/SelfAuthorized.sol"; /// @title Fallback Manager - A contract that manages fallback calls made to this contract /// @author Richard Meissner - <[email protected]> contract FallbackManager is SelfAuthorized { event ChangedFallbackHandler(address handler); // keccak256("fallback_manager.handler.address") bytes32 internal constant FALLBACK_HANDLER_STORAGE_SLOT = 0x6c9a6c4a39284e37ed1cf53d337577d14212a4870fb976a4366c693b939918d5; function internalSetFallbackHandler(address handler) internal { bytes32 slot = FALLBACK_HANDLER_STORAGE_SLOT; // solhint-disable-next-line no-inline-assembly assembly { sstore(slot, handler) } } /// @dev Allows to add a contract to handle fallback calls. /// Only fallback calls without value and with data will be forwarded. /// This can only be done via a Safe transaction. /// @param handler contract to handle fallbacks calls. function setFallbackHandler(address handler) public authorized { internalSetFallbackHandler(handler); emit ChangedFallbackHandler(handler); } // solhint-disable-next-line payable-fallback,no-complex-fallback fallback() external { bytes32 slot = FALLBACK_HANDLER_STORAGE_SLOT; // solhint-disable-next-line no-inline-assembly assembly { let handler := sload(slot) if iszero(handler) { return(0, 0) } calldatacopy(0, 0, calldatasize()) // The msg.sender address is shifted to the left by 12 bytes to remove the padding // Then the address without padding is stored right after the calldata mstore(calldatasize(), shl(96, caller())) // Add 20 bytes for the address appended add the end let success := call(gas(), handler, 0, 0, add(calldatasize(), 20), 0, 0) returndatacopy(0, 0, returndatasize()) if iszero(success) { revert(0, returndatasize()) } return(0, returndatasize()) } } } // SPDX-License-Identifier: LGPL-3.0-only pragma solidity >=0.7.0 <0.9.0; import "../common/Enum.sol"; import "../common/SelfAuthorized.sol"; interface Guard { 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; } /// @title Fallback Manager - A contract that manages fallback calls made to this contract /// @author Richard Meissner - <[email protected]> contract GuardManager is SelfAuthorized { event ChangedGuard(address guard); // keccak256("guard_manager.guard.address") bytes32 internal constant GUARD_STORAGE_SLOT = 0x4a204f620c8c5ccdca3fd54d003badd85ba500436a431f0cbda4f558c93c34c8; /// @dev Set a guard that checks transactions before execution /// @param guard The address of the guard to be used or the 0 address to disable the guard function setGuard(address guard) external authorized { bytes32 slot = GUARD_STORAGE_SLOT; // solhint-disable-next-line no-inline-assembly assembly { sstore(slot, guard) } emit ChangedGuard(guard); } function getGuard() internal view returns (address guard) { bytes32 slot = GUARD_STORAGE_SLOT; // solhint-disable-next-line no-inline-assembly assembly { guard := sload(slot) } } } // 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 that manages modules that can execute transactions via this contract /// @author Stefan George - <[email protected]> /// @author Richard Meissner - <[email protected]> contract ModuleManager is SelfAuthorized, Executor { event EnabledModule(address module); event DisabledModule(address module); event ExecutionFromModuleSuccess(address indexed module); event ExecutionFromModuleFailure(address indexed module); address internal constant SENTINEL_MODULES = address(0x1); mapping(address => address) internal modules; function setupModules(address to, bytes memory data) internal { require(modules[SENTINEL_MODULES] == address(0), "GS100"); modules[SENTINEL_MODULES] = SENTINEL_MODULES; if (to != address(0)) // Setup has to complete successfully or transaction fails. require(execute(to, 0, data, Enum.Operation.DelegateCall, gasleft()), "GS000"); } /// @dev Allows to add a module to the whitelist. /// This can only be done via a Safe transaction. /// @notice Enables the module `module` for the Safe. /// @param module Module to be whitelisted. function enableModule(address module) public authorized { // Module address cannot be null or sentinel. require(module != address(0) && module != SENTINEL_MODULES, "GS101"); // Module cannot be added twice. require(modules[module] == address(0), "GS102"); modules[module] = modules[SENTINEL_MODULES]; modules[SENTINEL_MODULES] = module; emit EnabledModule(module); } /// @dev Allows to remove a module from the whitelist. /// This can only be done via a Safe transaction. /// @notice Disables the module `module` for the Safe. /// @param prevModule Module that pointed to the module to be removed in the linked list /// @param module Module to be removed. function disableModule(address prevModule, address module) public authorized { // Validate module address and check that it corresponds to module index. require(module != address(0) && module != SENTINEL_MODULES, "GS101"); require(modules[prevModule] == module, "GS103"); modules[prevModule] = modules[module]; modules[module] = address(0); emit DisabledModule(module); } /// @dev Allows a Module to execute a Safe transaction without any further confirmations. /// @param to Destination address of module transaction. /// @param value Ether value of module transaction. /// @param data Data payload of module transaction. /// @param operation Operation type of module transaction. function execTransactionFromModule( address to, uint256 value, bytes memory data, Enum.Operation operation ) public virtual returns (bool success) { // Only whitelisted modules are allowed. require(msg.sender != SENTINEL_MODULES && modules[msg.sender] != address(0), "GS104"); // Execute transaction without further confirmations. success = execute(to, value, data, operation, gasleft()); if (success) emit ExecutionFromModuleSuccess(msg.sender); else emit ExecutionFromModuleFailure(msg.sender); } /// @dev Allows a Module to execute a Safe transaction without any further confirmations and return data /// @param to Destination address of module transaction. /// @param value Ether value of module transaction. /// @param data Data payload of module transaction. /// @param operation Operation type of module transaction. function execTransactionFromModuleReturnData( address to, uint256 value, bytes memory data, Enum.Operation operation ) public returns (bool success, bytes memory returnData) { success = execTransactionFromModule(to, value, data, operation); // solhint-disable-next-line no-inline-assembly assembly { // Load free memory location let ptr := mload(0x40) // We allocate memory for the return data by setting the free memory location to // current free memory location + data size + 32 bytes for data size value mstore(0x40, add(ptr, add(returndatasize(), 0x20))) // Store the size mstore(ptr, returndatasize()) // Store the data returndatacopy(add(ptr, 0x20), 0, returndatasize()) // Point the return data to the correct memory location returnData := ptr } } /// @dev Returns if an module is enabled /// @return True if the module is enabled function isModuleEnabled(address module) public view returns (bool) { return SENTINEL_MODULES != module && modules[module] != address(0); } /// @dev Returns array of modules. /// @param start Start of the page. /// @param pageSize Maximum number of modules that should be returned. /// @return array Array of modules. /// @return next Start of the next page. function getModulesPaginated(address start, uint256 pageSize) external view returns (address[] memory array, address next) { // Init array with max page size array = new address[](pageSize); // Populate return array uint256 moduleCount = 0; address currentModule = modules[start]; while (currentModule != address(0x0) && currentModule != SENTINEL_MODULES && moduleCount < pageSize) { array[moduleCount] = currentModule; currentModule = modules[currentModule]; moduleCount++; } next = currentModule; // Set correct size of returned array // solhint-disable-next-line no-inline-assembly assembly { mstore(array, moduleCount) } } } // SPDX-License-Identifier: LGPL-3.0-only pragma solidity >=0.7.0 <0.9.0; import "../common/SelfAuthorized.sol"; /// @title OwnerManager - Manages a set of owners and a threshold to perform actions. /// @author Stefan George - <[email protected]> /// @author Richard Meissner - <[email protected]> contract OwnerManager is SelfAuthorized { event AddedOwner(address owner); event RemovedOwner(address owner); event ChangedThreshold(uint256 threshold); address internal constant SENTINEL_OWNERS = address(0x1); mapping(address => address) internal owners; uint256 internal ownerCount; uint256 internal threshold; /// @dev Setup function sets initial storage of 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"); // No duplicate owners allowed. require(owners[owner] == address(0), "GS204"); owners[currentOwner] = owner; currentOwner = owner; } owners[currentOwner] = SENTINEL_OWNERS; ownerCount = _owners.length; threshold = _threshold; } /// @dev Allows to add a new owner to the Safe and update the threshold at the same time. /// This can only be done via a Safe transaction. /// @notice Adds the owner `owner` to the Safe and updates the threshold to `_threshold`. /// @param owner New owner address. /// @param _threshold New threshold. function addOwnerWithThreshold(address owner, uint256 _threshold) public authorized { // Owner address cannot be null, the sentinel or the Safe itself. require(owner != address(0) && owner != SENTINEL_OWNERS && owner != address(this), "GS203"); // No duplicate owners allowed. require(owners[owner] == address(0), "GS204"); owners[owner] = owners[SENTINEL_OWNERS]; owners[SENTINEL_OWNERS] = owner; ownerCount++; emit AddedOwner(owner); // Change threshold if threshold was changed. if (threshold != _threshold) changeThreshold(_threshold); } /// @dev Allows to remove an owner from the Safe and update the threshold at the same time. /// This can only be done via a Safe transaction. /// @notice Removes the owner `owner` from the Safe and updates the threshold to `_threshold`. /// @param prevOwner Owner that pointed to the owner to be removed in the linked list /// @param owner Owner address to be removed. /// @param _threshold New threshold. function removeOwner( address prevOwner, address owner, uint256 _threshold ) public authorized { // Only allow to remove an owner, if threshold can still be reached. require(ownerCount - 1 >= _threshold, "GS201"); // Validate owner address and check that it corresponds to owner index. require(owner != address(0) && owner != SENTINEL_OWNERS, "GS203"); require(owners[prevOwner] == owner, "GS205"); owners[prevOwner] = owners[owner]; owners[owner] = address(0); ownerCount--; emit RemovedOwner(owner); // Change threshold if threshold was changed. if (threshold != _threshold) changeThreshold(_threshold); } /// @dev Allows to swap/replace an owner from the Safe with another address. /// This can only be done via a Safe transaction. /// @notice Replaces the owner `oldOwner` in the Safe with `newOwner`. /// @param prevOwner Owner that pointed to the owner to be replaced in the linked list /// @param oldOwner Owner address to be replaced. /// @param newOwner New owner address. function swapOwner( address prevOwner, address oldOwner, address newOwner ) public authorized { // Owner address cannot be null, the sentinel or the Safe itself. require(newOwner != address(0) && newOwner != SENTINEL_OWNERS && newOwner != address(this), "GS203"); // No duplicate owners allowed. require(owners[newOwner] == address(0), "GS204"); // Validate oldOwner address and check that it corresponds to owner index. require(oldOwner != address(0) && oldOwner != SENTINEL_OWNERS, "GS203"); require(owners[prevOwner] == oldOwner, "GS205"); owners[newOwner] = owners[oldOwner]; owners[prevOwner] = newOwner; owners[oldOwner] = address(0); emit RemovedOwner(oldOwner); emit AddedOwner(newOwner); } /// @dev Allows to update the number of required confirmations by Safe owners. /// This can only be done via a Safe transaction. /// @notice Changes the threshold of the Safe to `_threshold`. /// @param _threshold New threshold. function changeThreshold(uint256 _threshold) public authorized { // Validate that threshold is smaller than number of owners. require(_threshold <= ownerCount, "GS201"); // There has to be at least one Safe owner. require(_threshold >= 1, "GS202"); threshold = _threshold; emit ChangedThreshold(threshold); } function getThreshold() public view returns (uint256) { return threshold; } function isOwner(address owner) public view returns (bool) { return owner != SENTINEL_OWNERS && owners[owner] != address(0); } /// @dev Returns array of owners. /// @return Array of Safe owners. function getOwners() public view returns (address[] memory) { address[] memory array = new address[](ownerCount); // populate return array uint256 index = 0; address currentOwner = owners[SENTINEL_OWNERS]; while (currentOwner != SENTINEL_OWNERS) { array[index] = currentOwner; currentOwner = owners[currentOwner]; index++; } return array; } } // SPDX-License-Identifier: LGPL-3.0-only pragma solidity >=0.7.0 <0.9.0; /// @title Enum - Collection of enums /// @author Richard Meissner - <[email protected]> contract Enum { enum Operation {Call, DelegateCall} } // SPDX-License-Identifier: LGPL-3.0-only pragma solidity >=0.7.0 <0.9.0; /// @title EtherPaymentFallback - A contract that has a fallback to accept ether payments /// @author Richard Meissner - <[email protected]> contract EtherPaymentFallback { event SafeReceived(address indexed sender, uint256 value); /// @dev Fallback function accepts Ether transactions. receive() external payable { emit SafeReceived(msg.sender, msg.value); } } // SPDX-License-Identifier: LGPL-3.0-only pragma solidity >=0.7.0 <0.9.0; /// @title SecuredTokenTransfer - Secure token transfer /// @author Richard Meissner - <[email protected]> contract SecuredTokenTransfer { /// @dev Transfers a token and returns if it was a success /// @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 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 } } } } // SPDX-License-Identifier: LGPL-3.0-only pragma solidity >=0.7.0 <0.9.0; /// @title SelfAuthorized - authorizes current contract to perform actions /// @author Richard Meissner - <[email protected]> contract SelfAuthorized { function requireSelfCall() private view { require(msg.sender == address(this), "GS031"); } modifier authorized() { // This is a function call as it minimized the bytecode size requireSelfCall(); _; } } // SPDX-License-Identifier: LGPL-3.0-only pragma solidity >=0.7.0 <0.9.0; /// @title SignatureDecoder - Decodes signatures that a encoded as bytes /// @author Richard Meissner - <[email protected]> contract SignatureDecoder { /// @dev divides bytes signature into `uint8 v, bytes32 r, bytes32 s`. /// @notice Make sure to peform a bounds check for @param pos, to avoid out of bounds access on @param signatures /// @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 rsv signatures function signatureSplit(bytes memory signatures, uint256 pos) internal pure returns ( uint8 v, bytes32 r, bytes32 s ) { // The signature format is a compact form of: // {bytes32 r}{bytes32 s}{uint8 v} // Compact means, uint8 is not padded to 32 bytes. // 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) } } } // SPDX-License-Identifier: LGPL-3.0-only pragma solidity >=0.7.0 <0.9.0; /// @title Singleton - Base for singleton contracts (should always be first super contract) /// This contract is tightly coupled to our proxy contract (see `proxies/GnosisSafeProxy.sol`) /// @author Richard Meissner - <[email protected]> contract Singleton { // singleton always needs to be first declared variable, to ensure that it is at the same location as in the Proxy contract. // It should also always be ensured that the address is stored alone (uses a full word) address private singleton; } // SPDX-License-Identifier: LGPL-3.0-only pragma solidity >=0.7.0 <0.9.0; /// @title StorageAccessible - generic base contract that allows callers to access all internal storage. /// @notice See https://github.com/gnosis/util-contracts/blob/bb5fe5fb5df6d8400998094fb1b32a178a47c3a1/contracts/StorageAccessible.sol contract StorageAccessible { /** * @dev 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 delegetecall 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 assembly { let success := delegatecall(gas(), targetContract, add(calldataPayload, 0x20), mload(calldataPayload), 0, 0) mstore(0x00, success) mstore(0x20, returndatasize()) returndatacopy(0x40, 0, returndatasize()) revert(0, add(returndatasize(), 0x40)) } } } // SPDX-License-Identifier: LGPL-3.0-only pragma solidity >=0.7.0 <0.9.0; /** * @title GnosisSafeMath * @dev Math operations with safety checks that revert on error * Renamed from SafeMath to GnosisSafeMath to avoid conflicts * TODO: remove once open zeppelin update to solc 0.5.0 */ library GnosisSafeMath { /** * @dev Multiplies two numbers, reverts on overflow. */ 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; } /** * @dev Subtracts two numbers, reverts on overflow (i.e. if subtrahend is greater than minuend). */ function sub(uint256 a, uint256 b) internal pure returns (uint256) { require(b <= a); uint256 c = a - b; return c; } /** * @dev Adds two numbers, reverts on overflow. */ function add(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; require(c >= a); return c; } /** * @dev Returns the largest of two numbers. */ function max(uint256 a, uint256 b) internal pure returns (uint256) { return a >= b ? a : b; } } // 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 { /** * @dev Should return whether the signature provided is valid for the provided data * @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); }