Contract Source Code:
// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity ^0.8.4;
pragma abicoder v2;
import '@openzeppelin/contracts/access/Ownable.sol';
import '@openzeppelin/contracts/utils/Strings.sol';
import './ERC721B.sol';
import "@openzeppelin/contracts/utils/math/SafeMath.sol";
/*Mint Info:
One Free Mint per Wallet
Price for any mints after: 0.0005 eth
Max Mints Per Wallet: 5
Supply: 10000
*/
contract TheMuslims is ERC721B, Ownable {
using Strings for uint256;
string public baseURI = "";
bool public isSaleActive = false;
mapping(address => bool) private _freeMintClaimed;
mapping(address => uint256) private _mintsClaimed;
uint256 public constant MAX_TOKENS = 5000;
uint256 public tokenPrice = 500000000000000;
uint256 public constant maxPerWallet = 5;
using SafeMath for uint256;
using Strings for uint256;
uint256 public devReserve = 5;
event NFTMINTED(uint256 tokenId, address owner);
constructor() ERC721B("TheMuslims", "MSL") {}
function _baseURI() internal view virtual returns (string memory) {
return baseURI;
}
function _price() internal view virtual returns (uint256) {
return tokenPrice;
}
function setBaseURI(string memory _newBaseURI) public onlyOwner {
baseURI = _newBaseURI;
}
function setPrice(uint256 _newTokenPrice) public onlyOwner {
tokenPrice = _newTokenPrice;
}
function activateSale() external onlyOwner {
isSaleActive = !isSaleActive;
}
function exists(uint256 tokenId) public view returns (bool) {
return _exists(tokenId);
}
function Withdraw() public payable onlyOwner {
(bool os, ) = payable(owner()).call{ value: address(this).balance }("");
require(os);
}
function reserveTokens(address dev, uint256 reserveAmount)
external
onlyOwner
{
require(
reserveAmount > 0 && reserveAmount <= devReserve,
"Dev reserve empty"
);
totalSupply().add(1);
_mint(dev, reserveAmount);
}
function mintMultiplePublic(address to, uint256 quantity) external payable {
require(isSaleActive, "Sale not Active");
require(
quantity > 0 && quantity <= maxPerWallet,
"Can Mint only 5 per Wallet"
);
require(
totalSupply().add(quantity) <= MAX_TOKENS,
"Mint is going over max per transaction"
);
require(msg.value >= tokenPrice.mul(quantity),
"0.0005 eth per token"
);
require(
_mintsClaimed[msg.sender].add(quantity) <= maxPerWallet,
"Only 5 mints per wallet, priced at 0.0005 eth"
);
_mintsClaimed[msg.sender] += quantity;
_mint(to, quantity);
}
function freeMintClaim(address to) external payable {
require(isSaleActive, "Sale not Active");
require(
totalSupply().add(1) <= MAX_TOKENS,
"Mint is going Supply"
);
require(
_freeMintClaimed[msg.sender] != true,
"Only one Free Mint per Wallet"
);
_freeMintClaimed[msg.sender] = true;
_mint(to, 1);
}
function tokenURI(uint256 tokenId)
public
view
virtual
override
returns (string memory)
{
require(
_exists(tokenId),
"ERC721Metadata: URI query for nonexistent token"
);
string memory currentBaseURI = _baseURI();
return
bytes(currentBaseURI).length > 0
? string(abi.encodePacked(currentBaseURI, tokenId.toString(), ".json"))
: "";
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (utils/math/SafeMath.sol)
pragma solidity ^0.8.0;
// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.
/**
* @dev Wrappers over Solidity's arithmetic operations.
*
* NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
* now has built in overflow checking.
*/
library SafeMath {
/**
* @dev Returns the addition of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
uint256 c = a + b;
if (c < a) return (false, 0);
return (true, c);
}
}
/**
* @dev Returns the subtraction of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b > a) return (false, 0);
return (true, a - b);
}
}
/**
* @dev Returns the multiplication of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
// 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-contracts/pull/522
if (a == 0) return (true, 0);
uint256 c = a * b;
if (c / a != b) return (false, 0);
return (true, c);
}
}
/**
* @dev Returns the division of two unsigned integers, with a division by zero flag.
*
* _Available since v3.4._
*/
function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b == 0) return (false, 0);
return (true, a / b);
}
}
/**
* @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
*
* _Available since v3.4._
*/
function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b == 0) return (false, 0);
return (true, a % b);
}
}
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
*
* - Addition cannot overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
return a + b;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return a - b;
}
/**
* @dev Returns the multiplication of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `*` operator.
*
* Requirements:
*
* - Multiplication cannot overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
return a * b;
}
/**
* @dev Returns the integer division of two unsigned integers, reverting on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator.
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return a / b;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* reverting when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
return a % b;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {trySub}.
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
unchecked {
require(b <= a, errorMessage);
return a - b;
}
}
/**
* @dev Returns the integer division of two unsigned integers, reverting with custom message on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
unchecked {
require(b > 0, errorMessage);
return a / b;
}
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* reverting with custom message when dividing by zero.
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {tryMod}.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
unchecked {
require(b > 0, errorMessage);
return a % b;
}
}
}
// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity ^0.8.4;
import '@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol';
error ApprovalCallerNotOwnerNorApproved();
error ApprovalQueryForNonexistentToken();
error ApproveToCaller();
error ApprovalToCurrentOwner();
error BalanceQueryForZeroAddress();
error MintedQueryForZeroAddress();
error MintToZeroAddress();
error MintZeroQuantity();
error OwnerIndexOutOfBounds();
error OwnerQueryForNonexistentToken();
error TokenIndexOutOfBounds();
error TransferCallerNotOwnerNorApproved();
error TransferFromIncorrectOwner();
error TransferToNonERC721ReceiverImplementer();
error TransferToZeroAddress();
error UnableDetermineTokenOwner();
error UnableGetTokenOwnerByIndex();
error URIQueryForNonexistentToken();
/**
* Updated, minimalist and gas efficient version of OpenZeppelins ERC721 contract.
* Includes the Metadata and Enumerable extension.
*
* Assumes serials are sequentially minted starting at 0 (e.g. 0, 1, 2, 3..).
* Does not support burning tokens
*
* @author beskay0x
* Credits: chiru-labs, solmate, transmissions11, nftchance, squeebo_nft and others
*/
abstract contract ERC721B {
/*///////////////////////////////////////////////////////////////
EVENTS
//////////////////////////////////////////////////////////////*/
event Transfer(address indexed from, address indexed to, uint256 indexed id);
event Approval(address indexed owner, address indexed spender, uint256 indexed id);
event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
/*///////////////////////////////////////////////////////////////
METADATA STORAGE/LOGIC
//////////////////////////////////////////////////////////////*/
string public name;
string public symbol;
function tokenURI(uint256 tokenId) public view virtual returns (string memory);
/*///////////////////////////////////////////////////////////////
ERC721 STORAGE
//////////////////////////////////////////////////////////////*/
// Array which maps token ID to address (index is tokenID)
address[] internal _owners;
// 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;
/*///////////////////////////////////////////////////////////////
CONSTRUCTOR
//////////////////////////////////////////////////////////////*/
constructor(string memory _name, string memory _symbol) {
name = _name;
symbol = _symbol;
}
/*///////////////////////////////////////////////////////////////
ERC165 LOGIC
//////////////////////////////////////////////////////////////*/
function supportsInterface(bytes4 interfaceId) public view virtual returns (bool) {
return
interfaceId == 0x01ffc9a7 || // ERC165 Interface ID for ERC165
interfaceId == 0x80ac58cd || // ERC165 Interface ID for ERC721
interfaceId == 0x780e9d63 || // ERC165 Interface ID for ERC721Enumerable
interfaceId == 0x5b5e139f; // ERC165 Interface ID for ERC721Metadata
}
/*///////////////////////////////////////////////////////////////
ERC721ENUMERABLE LOGIC
//////////////////////////////////////////////////////////////*/
/**
* @dev See {IERC721Enumerable-totalSupply}.
*/
function totalSupply() public view returns (uint256) {
return _owners.length;
}
/**
* @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
* Dont call this function on chain from another smart contract, since it can become quite expensive
*/
function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual returns (uint256 tokenId) {
if (index >= balanceOf(owner)) revert OwnerIndexOutOfBounds();
uint256 count;
uint256 qty = _owners.length;
// Cannot realistically overflow, since we are using uint256
unchecked {
for (tokenId; tokenId < qty; tokenId++) {
if (owner == ownerOf(tokenId)) {
if (count == index) return tokenId;
else count++;
}
}
}
revert UnableGetTokenOwnerByIndex();
}
/**
* @dev See {IERC721Enumerable-tokenByIndex}.
*/
function tokenByIndex(uint256 index) public view virtual returns (uint256) {
if (index >= totalSupply()) revert TokenIndexOutOfBounds();
return index;
}
/*///////////////////////////////////////////////////////////////
ERC721 LOGIC
//////////////////////////////////////////////////////////////*/
/**
* @dev Iterates through _owners array, returns balance of address
* It is not recommended to call this function from another smart contract
* as it can become quite expensive -- call this function off chain instead.
*/
function balanceOf(address owner) public view virtual returns (uint256) {
if (owner == address(0)) revert BalanceQueryForZeroAddress();
uint256 count;
uint256 qty = _owners.length;
// Cannot realistically overflow, since we are using uint256
unchecked {
for (uint256 i; i < qty; i++) {
if (owner == ownerOf(i)) {
count++;
}
}
}
return count;
}
/**
* @dev See {IERC721-ownerOf}.
* Gas spent here starts off proportional to the maximum mint batch size.
* It gradually moves to O(1) as tokens get transferred around in the collection over time.
*/
function ownerOf(uint256 tokenId) public view virtual returns (address) {
if (!_exists(tokenId)) revert OwnerQueryForNonexistentToken();
// Cannot realistically overflow, since we are using uint256
unchecked {
for (tokenId; ; tokenId++) {
if (_owners[tokenId] != address(0)) {
return _owners[tokenId];
}
}
}
revert UnableDetermineTokenOwner();
}
/**
* @dev See {IERC721-approve}.
*/
function approve(address to, uint256 tokenId) public virtual {
address owner = ownerOf(tokenId);
if (to == owner) revert ApprovalToCurrentOwner();
if (msg.sender != owner && !isApprovedForAll(owner, msg.sender)) revert ApprovalCallerNotOwnerNorApproved();
_tokenApprovals[tokenId] = to;
emit Approval(owner, to, tokenId);
}
/**
* @dev See {IERC721-getApproved}.
*/
function getApproved(uint256 tokenId) public view virtual returns (address) {
if (!_exists(tokenId)) revert ApprovalQueryForNonexistentToken();
return _tokenApprovals[tokenId];
}
/**
* @dev See {IERC721-setApprovalForAll}.
*/
function setApprovalForAll(address operator, bool approved) public virtual {
if (operator == msg.sender) revert ApproveToCaller();
_operatorApprovals[msg.sender][operator] = approved;
emit ApprovalForAll(msg.sender, operator, approved);
}
/**
* @dev See {IERC721-isApprovedForAll}.
*/
function isApprovedForAll(address owner, address operator) public view virtual returns (bool) {
return _operatorApprovals[owner][operator];
}
/**
* @dev See {IERC721-transferFrom}.
*/
function transferFrom(
address from,
address to,
uint256 tokenId
) public virtual {
if (!_exists(tokenId)) revert OwnerQueryForNonexistentToken();
if (ownerOf(tokenId) != from) revert TransferFromIncorrectOwner();
if (to == address(0)) revert TransferToZeroAddress();
bool isApprovedOrOwner = (msg.sender == from ||
msg.sender == getApproved(tokenId) ||
isApprovedForAll(from, msg.sender));
if (!isApprovedOrOwner) revert TransferCallerNotOwnerNorApproved();
// delete token approvals from previous owner
delete _tokenApprovals[tokenId];
_owners[tokenId] = to;
// if token ID below transferred one isnt set, set it to previous owner
// if tokenid is zero, skip this to prevent underflow
if (tokenId > 0 && _owners[tokenId - 1] == address(0)) {
_owners[tokenId - 1] = from;
}
emit Transfer(from, to, tokenId);
}
/**
* @dev See {IERC721-safeTransferFrom}.
*/
function safeTransferFrom(
address from,
address to,
uint256 id
) public virtual {
safeTransferFrom(from, to, id, '');
}
/**
* @dev See {IERC721-safeTransferFrom}.
*/
function safeTransferFrom(
address from,
address to,
uint256 id,
bytes memory data
) public virtual {
transferFrom(from, to, id);
if (!_checkOnERC721Received(from, to, id, data)) revert TransferToNonERC721ReceiverImplementer();
}
/**
* @dev Returns whether `tokenId` exists.
*/
function _exists(uint256 tokenId) internal view virtual returns (bool) {
return tokenId < _owners.length;
}
/**
* @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.code.length == 0) return true;
try IERC721Receiver(to).onERC721Received(msg.sender, from, tokenId, _data) returns (bytes4 retval) {
return retval == IERC721Receiver(to).onERC721Received.selector;
} catch (bytes memory reason) {
if (reason.length == 0) revert TransferToNonERC721ReceiverImplementer();
assembly {
revert(add(32, reason), mload(reason))
}
}
}
/*///////////////////////////////////////////////////////////////
INTERNAL MINT LOGIC
//////////////////////////////////////////////////////////////*/
/**
* @dev check if contract confirms token transfer, if not - reverts
* unlike the standard ERC721 implementation this is only called once per mint,
* no matter how many tokens get minted, since it is useless to check this
* requirement several times -- if the contract confirms one token,
* it will confirm all additional ones too.
* This saves us around 5k gas per additional mint
*/
function _safeMint(address to, uint256 qty) internal virtual {
_safeMint(to, qty, '');
}
function _safeMint(
address to,
uint256 qty,
bytes memory data
) internal virtual {
_mint(to, qty);
if (!_checkOnERC721Received(address(0), to, _owners.length - 1, data))
revert TransferToNonERC721ReceiverImplementer();
}
function _mint(address to, uint256 qty) internal virtual {
if (to == address(0)) revert MintToZeroAddress();
if (qty == 0) revert MintZeroQuantity();
uint256 _currentIndex = _owners.length;
// Cannot realistically overflow, since we are using uint256
unchecked {
for (uint256 i; i < qty - 1; i++) {
_owners.push();
emit Transfer(address(0), to, _currentIndex + i);
}
}
// set last index to receiver
_owners.push(to);
emit Transfer(address(0), to, _currentIndex + (qty - 1));
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Strings.sol)
pragma solidity ^0.8.0;
/**
* @dev String operations.
*/
library Strings {
bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
uint8 private constant _ADDRESS_LENGTH = 20;
/**
* @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);
}
/**
* @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
*/
function toHexString(address addr) internal pure returns (string memory) {
return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)
pragma solidity ^0.8.0;
import "../utils/Context.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 Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor() {
_transferOwnership(_msgSender());
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
_checkOwner();
_;
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view virtual returns (address) {
return _owner;
}
/**
* @dev Throws if the sender is not the owner.
*/
function _checkOwner() internal view virtual {
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 {
_transferOwnership(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");
_transferOwnership(newOwner);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Internal function without access restriction.
*/
function _transferOwnership(address newOwner) internal virtual {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol)
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 IERC721Receiver {
/**
* @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 `IERC721Receiver.onERC721Received.selector`.
*/
function onERC721Received(
address operator,
address from,
uint256 tokenId,
bytes calldata data
) external returns (bytes4);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
pragma solidity ^0.8.0;
/**
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
}
