Contract Name:
ETHDubaiTicket
Contract Source Code:
pragma experimental ABIEncoderV2;
pragma solidity ^0.8.10;
//SPDX-License-Identifier: MIT
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/utils/structs/EnumerableSet.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/utils/Counters.sol";
// GET LISTED ON OPENSEA: https://testnets.opensea.io/get-listed/step-two
contract ETHDubaiTicket {
using Counters for Counters.Counter;
using EnumerableSet for EnumerableSet.AddressSet;
Counters.Counter private _tokenIds;
address payable public owner;
uint256[90] public ticketOptions;
Settings public settings;
event Log(address indexed sender, string message);
event Lint(uint256 indexed tokenId, string message);
event LDiscount(address indexed sender, Discount discount, string message);
event LMint(address indexed sender, MintInfo[] mintInfo, string message);
enum Ticket {
CONFERENCE,
HOTEL_CONFERENCE,
WORKSHOP1_AND_PRE_PARTY,
WORKSHOP2_AND_PRE_PARTY,
WORKSHOP3_AND_PRE_PARTY,
HOTEL_WORKSHOP_AND_PRE_PARTY,
HOTEL_WORKSHOP1_AND_PRE_PARTY,
HOTEL_WORKSHOP2_AND_PRE_PARTY,
HOTEL_WORKSHOP3_AND_PRE_PARTY,
HOTEL2_WORKSHOP1_AND_PRE_PARTY,
HOTEL2_WORKSHOP2_AND_PRE_PARTY,
HOTEL2_WORKSHOP3_AND_PRE_PARTY,
HOTEL2_CONFERENCE,
WORKSHOP4_AND_PRE_PARTY,
HOTEL_WORKSHOP4_AND_PRE_PARTY,
HOTEL2_WORKSHOP4_AND_PRE_PARTY,
HACKATHON_AND_CONFERENCE_ONLY,
HOTEL_HACKATHON_AND_CONFERENCE_ONLY,
HOTEL2_HACKATHON_AND_CONFERENCE_ONLY,
HACKATHON_AND_PRE_PARTY,
HOTEL_HACKATHON_AND_PRE_PARTY,
HOTEL2_HACKATHON_AND_PRE_PARTY,
WORKSHOP5_AND_PRE_PARTY,
HOTEL_WORKSHOP5_AND_PRE_PARTY,
HOTEL2_WORKSHOP5_AND_PRE_PARTY,
WORKSHOP6_AND_PRE_PARTY,
HOTEL_WORKSHOP6_AND_PRE_PARTY,
HOTEL2_WORKSHOP6_AND_PRE_PARTY,
WORKSHOP7_AND_PRE_PARTY,
HOTEL_WORKSHOP7_AND_PRE_PARTY,
HOTEL2_WORKSHOP7_AND_PRE_PARTY,
WORKSHOP8_AND_PRE_PARTY,
HOTEL_WORKSHOP8_AND_PRE_PARTY,
HOTEL2_WORKSHOP8_AND_PRE_PARTY,
WORKSHOP9_AND_PRE_PARTY,
HOTEL_WORKSHOP9_AND_PRE_PARTY,
HOTEL2_WORKSHOP9_AND_PRE_PARTY,
WORKSHOP10_AND_PRE_PARTY,
HOTEL_WORKSHOP10_AND_PRE_PARTY,
HOTEL2_WORKSHOP10_AND_PRE_PARTY,
WORKSHOP11_AND_PRE_PARTY,
HOTEL_WORKSHOP11_AND_PRE_PARTY,
HOTEL2_WORKSHOP11_AND_PRE_PARTY,
WORKSHOP12_AND_PRE_PARTY,
HOTEL_WORKSHOP12_AND_PRE_PARTY,
HOTEL2_WORKSHOP12_AND_PRE_PARTY
}
EnumerableSet.AddressSet private daosAddresses;
mapping(address => uint256) public daosQty;
mapping(address => Counters.Counter) public daosUsed;
mapping(address => uint256) public daosMinBalance;
mapping(address => uint256) public daosDiscount;
mapping(address => uint256) public daosMinTotal;
mapping(address => Discount) public discounts;
event LTicketSettings(
TicketSettings indexed ticketSettings,
string message
);
constructor() {
emit Log(msg.sender, "created");
owner = payable(msg.sender);
settings.maxMint = 700;
settings.ticketSettings = TicketSettings("early");
ticketOptions[uint256(Ticket.CONFERENCE)] = 0.07 ether;
ticketOptions[uint256(Ticket.HOTEL_CONFERENCE)] = 0.17 ether;
ticketOptions[uint256(Ticket.WORKSHOP1_AND_PRE_PARTY)] = 0.12 ether;
ticketOptions[uint256(Ticket.WORKSHOP2_AND_PRE_PARTY)] = 0.12 ether;
ticketOptions[uint256(Ticket.WORKSHOP3_AND_PRE_PARTY)] = 0.12 ether;
ticketOptions[uint256(Ticket.HOTEL_WORKSHOP_AND_PRE_PARTY)] = 0.4 ether;
ticketOptions[
uint256(Ticket.HOTEL_WORKSHOP1_AND_PRE_PARTY)
] = 0.4 ether;
ticketOptions[
uint256(Ticket.HOTEL_WORKSHOP2_AND_PRE_PARTY)
] = 0.4 ether;
ticketOptions[
uint256(Ticket.HOTEL_WORKSHOP3_AND_PRE_PARTY)
] = 0.4 ether;
ticketOptions[
uint256(Ticket.HOTEL2_WORKSHOP1_AND_PRE_PARTY)
] = 0.5 ether;
ticketOptions[
uint256(Ticket.HOTEL2_WORKSHOP2_AND_PRE_PARTY)
] = 0.5 ether;
ticketOptions[
uint256(Ticket.HOTEL2_WORKSHOP3_AND_PRE_PARTY)
] = 0.5 ether;
ticketOptions[uint256(Ticket.HOTEL2_CONFERENCE)] = 0.3 ether;
ticketOptions[uint256(Ticket.WORKSHOP4_AND_PRE_PARTY)] = 0.12 ether;
ticketOptions[
uint256(Ticket.HOTEL_WORKSHOP4_AND_PRE_PARTY)
] = 0.4 ether;
ticketOptions[
uint256(Ticket.HOTEL2_WORKSHOP4_AND_PRE_PARTY)
] = 0.5 ether;
ticketOptions[
uint256(Ticket.HACKATHON_AND_CONFERENCE_ONLY)
] = 0.10 ether;
ticketOptions[
uint256(Ticket.HOTEL_HACKATHON_AND_CONFERENCE_ONLY)
] = 0.3 ether;
ticketOptions[
uint256(Ticket.HOTEL2_HACKATHON_AND_CONFERENCE_ONLY)
] = 0.4 ether;
ticketOptions[uint256(Ticket.HACKATHON_AND_PRE_PARTY)] = 0.12 ether;
ticketOptions[
uint256(Ticket.HOTEL_HACKATHON_AND_PRE_PARTY)
] = 0.4 ether;
ticketOptions[
uint256(Ticket.HOTEL2_HACKATHON_AND_PRE_PARTY)
] = 0.5 ether;
ticketOptions[uint256(Ticket.WORKSHOP5_AND_PRE_PARTY)] = 0.12 ether;
ticketOptions[
uint256(Ticket.HOTEL_WORKSHOP5_AND_PRE_PARTY)
] = 0.4 ether;
ticketOptions[
uint256(Ticket.HOTEL2_WORKSHOP5_AND_PRE_PARTY)
] = 0.5 ether;
ticketOptions[uint256(Ticket.WORKSHOP6_AND_PRE_PARTY)] = 0.12 ether;
ticketOptions[
uint256(Ticket.HOTEL_WORKSHOP6_AND_PRE_PARTY)
] = 0.4 ether;
ticketOptions[
uint256(Ticket.HOTEL2_WORKSHOP6_AND_PRE_PARTY)
] = 0.5 ether;
ticketOptions[uint256(Ticket.WORKSHOP7_AND_PRE_PARTY)] = 0.12 ether;
ticketOptions[
uint256(Ticket.HOTEL_WORKSHOP7_AND_PRE_PARTY)
] = 0.4 ether;
ticketOptions[
uint256(Ticket.HOTEL2_WORKSHOP7_AND_PRE_PARTY)
] = 0.5 ether;
ticketOptions[uint256(Ticket.WORKSHOP8_AND_PRE_PARTY)] = 0.12 ether;
ticketOptions[
uint256(Ticket.HOTEL_WORKSHOP8_AND_PRE_PARTY)
] = 0.4 ether;
ticketOptions[
uint256(Ticket.HOTEL2_WORKSHOP8_AND_PRE_PARTY)
] = 0.5 ether;
ticketOptions[uint256(Ticket.WORKSHOP9_AND_PRE_PARTY)] = 0.12 ether;
ticketOptions[
uint256(Ticket.HOTEL_WORKSHOP9_AND_PRE_PARTY)
] = 0.4 ether;
ticketOptions[
uint256(Ticket.HOTEL2_WORKSHOP9_AND_PRE_PARTY)
] = 0.5 ether;
ticketOptions[uint256(Ticket.WORKSHOP10_AND_PRE_PARTY)] = 0.12 ether;
ticketOptions[
uint256(Ticket.HOTEL_WORKSHOP10_AND_PRE_PARTY)
] = 0.4 ether;
ticketOptions[
uint256(Ticket.HOTEL2_WORKSHOP10_AND_PRE_PARTY)
] = 0.5 ether;
ticketOptions[uint256(Ticket.WORKSHOP11_AND_PRE_PARTY)] = 0.12 ether;
ticketOptions[
uint256(Ticket.HOTEL_WORKSHOP11_AND_PRE_PARTY)
] = 0.4 ether;
ticketOptions[
uint256(Ticket.HOTEL2_WORKSHOP11_AND_PRE_PARTY)
] = 0.5 ether;
ticketOptions[uint256(Ticket.WORKSHOP12_AND_PRE_PARTY)] = 0.12 ether;
ticketOptions[
uint256(Ticket.HOTEL_WORKSHOP12_AND_PRE_PARTY)
] = 0.4 ether;
ticketOptions[
uint256(Ticket.HOTEL2_WORKSHOP12_AND_PRE_PARTY)
] = 0.5 ether;
}
struct Discount {
uint256[] ticketOptions;
uint256 amount;
}
struct TicketSettings {
string name;
}
struct MintInfo {
string ticketCode;
uint256 ticketOption;
string specialStatus;
}
struct Settings {
TicketSettings ticketSettings;
uint256 maxMint;
}
function setDiscount(
address buyer,
uint256[] memory newDiscounts,
uint256 amount
) public returns (bool) {
require(msg.sender == owner, "only owner");
Discount memory d = Discount(newDiscounts, amount);
emit LDiscount(buyer, d, "set discount buyer");
discounts[buyer] = d;
return true;
}
function setMaxMint(uint256 max) public returns (uint256) {
require(msg.sender == owner, "only owner");
settings.maxMint = max;
emit Lint(max, "setMaxMint");
return max;
}
function setTicketOptions(uint256 ticketOptionId, uint256 amount)
public
returns (bool)
{
require(msg.sender == owner, "only owner");
ticketOptions[ticketOptionId] = amount;
return true;
}
function setDao(
address dao,
uint256 qty,
uint256 discount,
uint256 minBalance,
uint256 minTotal
) public returns (bool) {
require(msg.sender == owner, "only owner");
require(Address.isContract(dao), "nc");
if (!daosAddresses.contains(dao)) {
daosAddresses.add(dao);
}
daosQty[dao] = qty;
daosMinBalance[dao] = minBalance;
daosDiscount[dao] = discount;
daosMinTotal[dao] = minTotal;
return true;
}
function setTicketSettings(string memory name) public returns (bool) {
require(msg.sender == owner, "only owner");
settings.ticketSettings.name = name;
emit LTicketSettings(settings.ticketSettings, "setTicketSettings");
return true;
}
function cmpStr(string memory idopt, string memory opt)
internal
pure
returns (bool)
{
return (keccak256(abi.encodePacked((idopt))) ==
keccak256(abi.encodePacked((opt))));
}
function getDiscount(address sender, uint256 ticketOption)
public
view
returns (uint256[2] memory)
{
Discount memory discount = discounts[sender];
uint256 amount = discounts[sender].amount;
uint256 total = 0;
bool hasDiscount = false;
total = total + ticketOptions[ticketOption];
if (amount > 0) {
for (uint256 j = 0; j < discount.ticketOptions.length; j++) {
if (discount.ticketOptions[j] == ticketOption) {
hasDiscount = true;
}
}
if (!hasDiscount) {
amount = 0;
}
}
return [amount, total];
}
function getDaoDiscountView(uint256 amount)
internal
view
returns (uint256[2] memory)
{
uint256 minTotal = 0;
if (amount == 0) {
uint256 b = 0;
for (uint256 j = 0; j < daosAddresses.length(); j++) {
address dao = daosAddresses.at(j);
if (daosDiscount[dao] > 0) {
ERC20 token = ERC20(dao);
b = token.balanceOf(msg.sender);
if (
b > daosMinBalance[dao] &&
daosUsed[dao].current() < daosQty[dao] &&
amount == 0
) {
amount = daosDiscount[dao];
minTotal = daosMinTotal[dao];
}
}
}
}
return [amount, minTotal];
}
function getDaoDiscount(uint256 amount)
internal
returns (uint256[2] memory)
{
uint256 minTotal = 0;
if (amount == 0) {
uint256 b = 0;
for (uint256 j = 0; j < daosAddresses.length(); j++) {
address dao = daosAddresses.at(j);
if (daosDiscount[dao] > 0) {
ERC20 token = ERC20(dao);
b = token.balanceOf(msg.sender);
if (
b > daosMinBalance[dao] &&
daosUsed[dao].current() < daosQty[dao] &&
amount == 0
) {
amount = daosDiscount[dao];
daosUsed[dao].increment();
minTotal = daosMinTotal[dao];
}
}
}
}
return [amount, minTotal];
}
function getPrice(address sender, uint256 ticketOption)
public
returns (uint256)
{
uint256[2] memory amountAndTotal = getDiscount(sender, ticketOption);
uint256 total = amountAndTotal[1];
uint256[2] memory amountAndMinTotal = getDaoDiscount(amountAndTotal[0]);
require(total > 0, "total = 0");
if (amountAndMinTotal[0] > 0 && total >= amountAndMinTotal[1]) {
total = total - ((total * amountAndMinTotal[0]) / 100);
}
return total;
}
function getPriceView(address sender, uint256 ticketOption)
public
view
returns (uint256)
{
uint256[2] memory amountAndTotal = getDiscount(sender, ticketOption);
uint256 total = amountAndTotal[1];
uint256[2] memory amountAndMinTotal = getDaoDiscountView(
amountAndTotal[0]
);
require(total > 0, "total = 0");
if (amountAndMinTotal[0] > 0 && total >= amountAndMinTotal[1]) {
total = total - ((total * amountAndMinTotal[0]) / 100);
}
return total;
}
function totalPrice(MintInfo[] memory mIs) public view returns (uint256) {
uint256 t = 0;
for (uint256 i = 0; i < mIs.length; i++) {
t += getPriceView(msg.sender, mIs[i].ticketOption);
}
return t;
}
function totalPriceInternal(MintInfo[] memory mIs)
internal
returns (uint256)
{
uint256 t = 0;
for (uint256 i = 0; i < mIs.length; i++) {
t += getPrice(msg.sender, mIs[i].ticketOption);
}
return t;
}
function mintItem(MintInfo[] memory mintInfos)
public
payable
returns (string memory)
{
require(
_tokenIds.current() + mintInfos.length <= settings.maxMint,
"sold out"
);
uint256 total = 0;
string memory ids = "";
for (uint256 i = 0; i < mintInfos.length; i++) {
require(
keccak256(abi.encodePacked(mintInfos[i].specialStatus)) ==
keccak256(abi.encodePacked("")) ||
msg.sender == owner,
"only owner"
);
total += getPrice(msg.sender, mintInfos[i].ticketOption);
_tokenIds.increment();
}
require(msg.value >= total, "price too low");
//emit LMint(msg.sender, mintInfos, "minted");
return ids;
}
function mintItemNoDiscount(MintInfo[] memory mintInfos)
public
payable
returns (string memory)
{
require(
_tokenIds.current() + mintInfos.length <= settings.maxMint,
"sold out"
);
uint256 total = 0;
string memory ids = "";
for (uint256 i = 0; i < mintInfos.length; i++) {
require(
keccak256(abi.encodePacked(mintInfos[i].specialStatus)) ==
keccak256(abi.encodePacked("")) ||
msg.sender == owner,
"only owner"
);
total += ticketOptions[mintInfos[i].ticketOption];
_tokenIds.increment();
}
require(msg.value >= total, "price too low");
//emit LMint(msg.sender, mintInfos, "minted");
return ids;
}
function withdraw() public {
uint256 amount = address(this).balance;
(bool ok, ) = owner.call{value: amount}("");
require(ok, "Failed");
emit Lint(amount, "withdraw");
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";
/**
* @dev Implementation of the {IERC20} interface.
*
* This implementation is agnostic to the way tokens are created. This means
* that a supply mechanism has to be added in a derived contract using {_mint}.
* For a generic mechanism see {ERC20PresetMinterPauser}.
*
* TIP: For a detailed writeup see our guide
* https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
* to implement supply mechanisms].
*
* We have followed general OpenZeppelin Contracts guidelines: functions revert
* instead returning `false` on failure. This behavior is nonetheless
* conventional and does not conflict with the expectations of ERC20
* applications.
*
* Additionally, an {Approval} event is emitted on calls to {transferFrom}.
* This allows applications to reconstruct the allowance for all accounts just
* by listening to said events. Other implementations of the EIP may not emit
* these events, as it isn't required by the specification.
*
* Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
* functions have been added to mitigate the well-known issues around setting
* allowances. See {IERC20-approve}.
*/
contract ERC20 is Context, IERC20, IERC20Metadata {
mapping(address => uint256) private _balances;
mapping(address => mapping(address => uint256)) private _allowances;
uint256 private _totalSupply;
string private _name;
string private _symbol;
/**
* @dev Sets the values for {name} and {symbol}.
*
* The default value of {decimals} is 18. To select a different value for
* {decimals} you should overload it.
*
* All two of these values are immutable: they can only be set once during
* construction.
*/
constructor(string memory name_, string memory symbol_) {
_name = name_;
_symbol = symbol_;
}
/**
* @dev Returns the name of the token.
*/
function name() public view virtual override returns (string memory) {
return _name;
}
/**
* @dev Returns the symbol of the token, usually a shorter version of the
* name.
*/
function symbol() public view virtual override returns (string memory) {
return _symbol;
}
/**
* @dev Returns the number of decimals used to get its user representation.
* For example, if `decimals` equals `2`, a balance of `505` tokens should
* be displayed to a user as `5.05` (`505 / 10 ** 2`).
*
* Tokens usually opt for a value of 18, imitating the relationship between
* Ether and Wei. This is the value {ERC20} uses, unless this function is
* overridden;
*
* NOTE: This information is only used for _display_ purposes: it in
* no way affects any of the arithmetic of the contract, including
* {IERC20-balanceOf} and {IERC20-transfer}.
*/
function decimals() public view virtual override returns (uint8) {
return 18;
}
/**
* @dev See {IERC20-totalSupply}.
*/
function totalSupply() public view virtual override returns (uint256) {
return _totalSupply;
}
/**
* @dev See {IERC20-balanceOf}.
*/
function balanceOf(address account) public view virtual override returns (uint256) {
return _balances[account];
}
/**
* @dev See {IERC20-transfer}.
*
* Requirements:
*
* - `recipient` cannot be the zero address.
* - the caller must have a balance of at least `amount`.
*/
function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
_transfer(_msgSender(), recipient, amount);
return true;
}
/**
* @dev See {IERC20-allowance}.
*/
function allowance(address owner, address spender) public view virtual override returns (uint256) {
return _allowances[owner][spender];
}
/**
* @dev See {IERC20-approve}.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function approve(address spender, uint256 amount) public virtual override returns (bool) {
_approve(_msgSender(), spender, amount);
return true;
}
/**
* @dev See {IERC20-transferFrom}.
*
* Emits an {Approval} event indicating the updated allowance. This is not
* required by the EIP. See the note at the beginning of {ERC20}.
*
* Requirements:
*
* - `sender` and `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
* - the caller must have allowance for ``sender``'s tokens of at least
* `amount`.
*/
function transferFrom(
address sender,
address recipient,
uint256 amount
) public virtual override returns (bool) {
_transfer(sender, recipient, amount);
uint256 currentAllowance = _allowances[sender][_msgSender()];
require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
unchecked {
_approve(sender, _msgSender(), currentAllowance - amount);
}
return true;
}
/**
* @dev Atomically increases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
return true;
}
/**
* @dev Atomically decreases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
* - `spender` must have allowance for the caller of at least
* `subtractedValue`.
*/
function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
uint256 currentAllowance = _allowances[_msgSender()][spender];
require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
unchecked {
_approve(_msgSender(), spender, currentAllowance - subtractedValue);
}
return true;
}
/**
* @dev Moves `amount` of tokens from `sender` to `recipient`.
*
* This internal function is equivalent to {transfer}, and can be used to
* e.g. implement automatic token fees, slashing mechanisms, etc.
*
* Emits a {Transfer} event.
*
* Requirements:
*
* - `sender` cannot be the zero address.
* - `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
*/
function _transfer(
address sender,
address recipient,
uint256 amount
) internal virtual {
require(sender != address(0), "ERC20: transfer from the zero address");
require(recipient != address(0), "ERC20: transfer to the zero address");
_beforeTokenTransfer(sender, recipient, amount);
uint256 senderBalance = _balances[sender];
require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
unchecked {
_balances[sender] = senderBalance - amount;
}
_balances[recipient] += amount;
emit Transfer(sender, recipient, amount);
_afterTokenTransfer(sender, recipient, amount);
}
/** @dev Creates `amount` tokens and assigns them to `account`, increasing
* the total supply.
*
* Emits a {Transfer} event with `from` set to the zero address.
*
* Requirements:
*
* - `account` cannot be the zero address.
*/
function _mint(address account, uint256 amount) internal virtual {
require(account != address(0), "ERC20: mint to the zero address");
_beforeTokenTransfer(address(0), account, amount);
_totalSupply += amount;
_balances[account] += amount;
emit Transfer(address(0), account, amount);
_afterTokenTransfer(address(0), account, amount);
}
/**
* @dev Destroys `amount` tokens from `account`, reducing the
* total supply.
*
* Emits a {Transfer} event with `to` set to the zero address.
*
* Requirements:
*
* - `account` cannot be the zero address.
* - `account` must have at least `amount` tokens.
*/
function _burn(address account, uint256 amount) internal virtual {
require(account != address(0), "ERC20: burn from the zero address");
_beforeTokenTransfer(account, address(0), amount);
uint256 accountBalance = _balances[account];
require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
unchecked {
_balances[account] = accountBalance - amount;
}
_totalSupply -= amount;
emit Transfer(account, address(0), amount);
_afterTokenTransfer(account, address(0), amount);
}
/**
* @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
*
* This internal function is equivalent to `approve`, and can be used to
* e.g. set automatic allowances for certain subsystems, etc.
*
* Emits an {Approval} event.
*
* Requirements:
*
* - `owner` cannot be the zero address.
* - `spender` cannot be the zero address.
*/
function _approve(
address owner,
address spender,
uint256 amount
) internal virtual {
require(owner != address(0), "ERC20: approve from the zero address");
require(spender != address(0), "ERC20: approve to the zero address");
_allowances[owner][spender] = amount;
emit Approval(owner, spender, amount);
}
/**
* @dev Hook that is called before any transfer of tokens. This includes
* minting and burning.
*
* Calling conditions:
*
* - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
* will be transferred to `to`.
* - when `from` is zero, `amount` tokens will be minted for `to`.
* - when `to` is zero, `amount` of ``from``'s tokens 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 amount
) internal virtual {}
/**
* @dev Hook that is called after any transfer of tokens. This includes
* minting and burning.
*
* Calling conditions:
*
* - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
* has been transferred to `to`.
* - when `from` is zero, `amount` tokens have been minted for `to`.
* - when `to` is zero, `amount` of ``from``'s tokens have been 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 _afterTokenTransfer(
address from,
address to,
uint256 amount
) internal virtual {}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @dev Library for managing
* https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
* types.
*
* Sets have the following properties:
*
* - Elements are added, removed, and checked for existence in constant time
* (O(1)).
* - Elements are enumerated in O(n). No guarantees are made on the ordering.
*
* ```
* contract Example {
* // Add the library methods
* using EnumerableSet for EnumerableSet.AddressSet;
*
* // Declare a set state variable
* EnumerableSet.AddressSet private mySet;
* }
* ```
*
* As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
* and `uint256` (`UintSet`) are supported.
*/
library EnumerableSet {
// To implement this library for multiple types with as little code
// repetition as possible, we write it in terms of a generic Set type with
// bytes32 values.
// The Set implementation uses private functions, and user-facing
// implementations (such as AddressSet) are just wrappers around the
// underlying Set.
// This means that we can only create new EnumerableSets for types that fit
// in bytes32.
struct Set {
// Storage of set values
bytes32[] _values;
// Position of the value in the `values` array, plus 1 because index 0
// means a value is not in the set.
mapping(bytes32 => uint256) _indexes;
}
/**
* @dev Add a value to a set. O(1).
*
* Returns true if the value was added to the set, that is if it was not
* already present.
*/
function _add(Set storage set, bytes32 value) private returns (bool) {
if (!_contains(set, value)) {
set._values.push(value);
// The value is stored at length-1, but we add 1 to all indexes
// and use 0 as a sentinel value
set._indexes[value] = set._values.length;
return true;
} else {
return false;
}
}
/**
* @dev Removes a value from a set. O(1).
*
* Returns true if the value was removed from the set, that is if it was
* present.
*/
function _remove(Set storage set, bytes32 value) private returns (bool) {
// We read and store the value's index to prevent multiple reads from the same storage slot
uint256 valueIndex = set._indexes[value];
if (valueIndex != 0) {
// Equivalent to contains(set, value)
// To delete an element from the _values array in O(1), we swap the element to delete with the last one in
// the array, and then remove the last element (sometimes called as 'swap and pop').
// This modifies the order of the array, as noted in {at}.
uint256 toDeleteIndex = valueIndex - 1;
uint256 lastIndex = set._values.length - 1;
if (lastIndex != toDeleteIndex) {
bytes32 lastvalue = set._values[lastIndex];
// Move the last value to the index where the value to delete is
set._values[toDeleteIndex] = lastvalue;
// Update the index for the moved value
set._indexes[lastvalue] = valueIndex; // Replace lastvalue's index to valueIndex
}
// Delete the slot where the moved value was stored
set._values.pop();
// Delete the index for the deleted slot
delete set._indexes[value];
return true;
} else {
return false;
}
}
/**
* @dev Returns true if the value is in the set. O(1).
*/
function _contains(Set storage set, bytes32 value) private view returns (bool) {
return set._indexes[value] != 0;
}
/**
* @dev Returns the number of values on the set. O(1).
*/
function _length(Set storage set) private view returns (uint256) {
return set._values.length;
}
/**
* @dev Returns the value stored at position `index` in the set. O(1).
*
* Note that there are no guarantees on the ordering of values inside the
* array, and it may change when more values are added or removed.
*
* Requirements:
*
* - `index` must be strictly less than {length}.
*/
function _at(Set storage set, uint256 index) private view returns (bytes32) {
return set._values[index];
}
/**
* @dev Return the entire set in an array
*
* WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
* to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
* this function has an unbounded cost, and using it as part of a state-changing function may render the function
* uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
*/
function _values(Set storage set) private view returns (bytes32[] memory) {
return set._values;
}
// Bytes32Set
struct Bytes32Set {
Set _inner;
}
/**
* @dev Add a value to a set. O(1).
*
* Returns true if the value was added to the set, that is if it was not
* already present.
*/
function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
return _add(set._inner, value);
}
/**
* @dev Removes a value from a set. O(1).
*
* Returns true if the value was removed from the set, that is if it was
* present.
*/
function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
return _remove(set._inner, value);
}
/**
* @dev Returns true if the value is in the set. O(1).
*/
function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
return _contains(set._inner, value);
}
/**
* @dev Returns the number of values in the set. O(1).
*/
function length(Bytes32Set storage set) internal view returns (uint256) {
return _length(set._inner);
}
/**
* @dev Returns the value stored at position `index` in the set. O(1).
*
* Note that there are no guarantees on the ordering of values inside the
* array, and it may change when more values are added or removed.
*
* Requirements:
*
* - `index` must be strictly less than {length}.
*/
function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
return _at(set._inner, index);
}
/**
* @dev Return the entire set in an array
*
* WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
* to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
* this function has an unbounded cost, and using it as part of a state-changing function may render the function
* uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
*/
function values(Bytes32Set storage set) internal view returns (bytes32[] memory) {
return _values(set._inner);
}
// AddressSet
struct AddressSet {
Set _inner;
}
/**
* @dev Add a value to a set. O(1).
*
* Returns true if the value was added to the set, that is if it was not
* already present.
*/
function add(AddressSet storage set, address value) internal returns (bool) {
return _add(set._inner, bytes32(uint256(uint160(value))));
}
/**
* @dev Removes a value from a set. O(1).
*
* Returns true if the value was removed from the set, that is if it was
* present.
*/
function remove(AddressSet storage set, address value) internal returns (bool) {
return _remove(set._inner, bytes32(uint256(uint160(value))));
}
/**
* @dev Returns true if the value is in the set. O(1).
*/
function contains(AddressSet storage set, address value) internal view returns (bool) {
return _contains(set._inner, bytes32(uint256(uint160(value))));
}
/**
* @dev Returns the number of values in the set. O(1).
*/
function length(AddressSet storage set) internal view returns (uint256) {
return _length(set._inner);
}
/**
* @dev Returns the value stored at position `index` in the set. O(1).
*
* Note that there are no guarantees on the ordering of values inside the
* array, and it may change when more values are added or removed.
*
* Requirements:
*
* - `index` must be strictly less than {length}.
*/
function at(AddressSet storage set, uint256 index) internal view returns (address) {
return address(uint160(uint256(_at(set._inner, index))));
}
/**
* @dev Return the entire set in an array
*
* WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
* to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
* this function has an unbounded cost, and using it as part of a state-changing function may render the function
* uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
*/
function values(AddressSet storage set) internal view returns (address[] memory) {
bytes32[] memory store = _values(set._inner);
address[] memory result;
assembly {
result := store
}
return result;
}
// UintSet
struct UintSet {
Set _inner;
}
/**
* @dev Add a value to a set. O(1).
*
* Returns true if the value was added to the set, that is if it was not
* already present.
*/
function add(UintSet storage set, uint256 value) internal returns (bool) {
return _add(set._inner, bytes32(value));
}
/**
* @dev Removes a value from a set. O(1).
*
* Returns true if the value was removed from the set, that is if it was
* present.
*/
function remove(UintSet storage set, uint256 value) internal returns (bool) {
return _remove(set._inner, bytes32(value));
}
/**
* @dev Returns true if the value is in the set. O(1).
*/
function contains(UintSet storage set, uint256 value) internal view returns (bool) {
return _contains(set._inner, bytes32(value));
}
/**
* @dev Returns the number of values on the set. O(1).
*/
function length(UintSet storage set) internal view returns (uint256) {
return _length(set._inner);
}
/**
* @dev Returns the value stored at position `index` in the set. O(1).
*
* Note that there are no guarantees on the ordering of values inside the
* array, and it may change when more values are added or removed.
*
* Requirements:
*
* - `index` must be strictly less than {length}.
*/
function at(UintSet storage set, uint256 index) internal view returns (uint256) {
return uint256(_at(set._inner, index));
}
/**
* @dev Return the entire set in an array
*
* WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
* to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
* this function has an unbounded cost, and using it as part of a state-changing function may render the function
* uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
*/
function values(UintSet storage set) internal view returns (uint256[] memory) {
bytes32[] memory store = _values(set._inner);
uint256[] memory result;
assembly {
result := store
}
return result;
}
}
// 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;
/**
* @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 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 "../IERC20.sol";
/**
* @dev Interface for the optional metadata functions from the ERC20 standard.
*
* _Available since v4.1._
*/
interface IERC20Metadata is IERC20 {
/**
* @dev Returns the name of the token.
*/
function name() external view returns (string memory);
/**
* @dev Returns the symbol of the token.
*/
function symbol() external view returns (string memory);
/**
* @dev Returns the decimals places of the token.
*/
function decimals() external view returns (uint8);
}
// SPDX-License-Identifier: MIT
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;
}
}
pragma solidity ^0.8.10;
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
contract Unlimited is ERC20 {
constructor() ERC20("ETHDubaiDiscount", "EDD") {
mintTokens();
}
function mintTokens() public {
_mint(msg.sender, 100000000000000000000000);
}
}