// File: @openzeppelin/contracts/token/ERC20/IERC20.sol
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);
}
// File: @openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol
pragma solidity ^0.8.0;
/**
* @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);
}
// File: @openzeppelin/contracts/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;
}
}
// File: @openzeppelin/contracts/token/ERC20/ERC20.sol
pragma solidity ^0.8.0;
/**
* @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 {}
}
// File: @openzeppelin/contracts/access/Ownable.sol
pragma solidity ^0.8.0;
/**
* @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() {
_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);
}
}
// File: peeny/peeny.sol
pragma solidity ^0.8.2;
contract Peeny is ERC20, Ownable {
uint256 private constant MILLION = 1000000;
uint256 private constant NUMBER_OF_COINS_MINTED = 100 * MILLION;
// How many Peeny have been claimed through contribute()
uint256 public peenyReserved = 0;
// How many Peeny have been given out through issue()
uint256 public peenyDistributed = 0;
uint256 private numberOfContributions = 1;
// Each contribution must be at least minimumContributionWei or it will fail.
uint256 private minimumContributionWei = 100000000000000;
// How much WEI has been received by the ICO.
uint256 public contributionsReceived = 0;
bool private icoOpen = true;
// When <i> million Peeny have been sold, exchangeRate[i] contains the price
// in Wei of one MicroPeeny (10^12) until the next million Peeny is sold,
// after which exchangeRate[i+1] will be used for the next million Peeny.
uint256[90] exchangeRates = [300, 360, 432, 518, 622, 746, 895, 1074, 1289, 1547, 1857, 2229, 2674, 3209, 3851, 4622, 5546, 6655, 7986, 9584, 11501, 13801, 16561, 19874, 23849, 28618, 34342, 41211, 49453, 59344, 71212, 85455, 102546, 123055, 147667, 177200, 212640, 255168, 306202, 367442, 440931, 529117, 634941, 761929, 914315, 1097178, 1316614, 1579937, 1895924, 2275109, 2730131, 3276157, 3931389, 4717667, 5661200, 6793440, 8152128, 9782554, 11739065, 14086878, 16904254, 20285105, 24342126, 29210551, 35052661, 42063194, 50475832, 60570999, 72685199, 87222239, 104666687, 125600024, 150720029, 180864035, 217036842, 260444210, 312533052, 375039663, 450047596, 540057115, 648068538, 777682246, 933218695, 1119862434, 1343834921, 1612601905, 1935122287, 2322146744, 2786576093, 3343891312];
struct Funder {
uint256 donation;
uint256 numberOfCoins;
// Add date
}
event LogUint256(uint256 val, string message);
event Issue(Funder funder);
mapping(address => Funder) public contributions;
// List of contributors who have contributed and need to be issued Peeny.
address[] contributors;
constructor() ERC20("Peeny", "PP") {
_mint(msg.sender, NUMBER_OF_COINS_MINTED * 10 ** decimals());
}
// Suport the Peeny ICO! Thank you for your support of the Dick Chainy foundation.
// If you've altready contributed, you can't contribute again until your coins have
// been distributed.
function contribute() public payable {
require(icoOpen, "The Peeny ICO has now ended.");
require(msg.value >= minimumContributionWei, "Minimum contribution must be at least getMinimumContribution(). ");
Funder storage funder = contributions[address(msg.sender)];
require(funder.numberOfCoins == 0 && funder.donation == 0, "You have already contributed a donation and will be receiving your Peeny shortly. Please wait until you receive your Peeny before making another contribution. Thanks for supporting the Dick Chainy Foundation!");
funder.donation = msg.value;
contributionsReceived += funder.donation;
funder.numberOfCoins = donationInWeiToPeeny(msg.value);
contributors.push(msg.sender);
peenyReserved += funder.numberOfCoins;
numberOfContributions++;
}
// When donating Wei, the user will receive Peeny according to the exchange rate.
// The current exchange rate is stored in the public variable weiToMicroPeeny, but
// every 1 million Peeny that are sold will decrease the amount of MicroPeeny granted
// for the same amount of Wei.
// Note that contribute will add the user's contribution to a the contributions mapping,
// but coins are not guaranteed based on the response of this function. They will be
// granted in order based on when Funders were added to the contributions mapping, so
// this function will be an upper bound on the amount of Peeny granted. The amount of
// Peeny can be less if another contribution is made in the same block which causes the
// number of coins granted to go beyond the next million Peeny because the exchange rate
// will change due to the other contribution.
function _donationInWeiToPeeny(uint256 donation, uint256 inPeenyDistributed) view public returns (uint256) {
// This can be peenyReserved (from contribute) or peenyDistributed (from issue).
uint256 tempPeenyDistributed = inPeenyDistributed;
uint256 estimatedPeeny = 0;
uint256 numLoops = 0;
while (donation > 0 && tempPeenyDistributed <= NUMBER_OF_COINS_MINTED * 10**decimals() * 9 / 10) {
// Integer 0-90, how many millions of peeny have been sold
uint256 currentMillionPeeny = tempPeenyDistributed / MILLION / 10 ** decimals();
assert(currentMillionPeeny <= 89);
uint256 nextMillionPeeny = currentMillionPeeny + 1;
uint256 tempExchangeRate = exchangeRates[currentMillionPeeny];
// peeny = wei * wei / micropeeny * peeny / micropeeny
uint256 peenyAtCurrentExchangeRate = donation * 10**12 / tempExchangeRate;
// If we don't go over to the next million)
if (peenyAtCurrentExchangeRate + tempPeenyDistributed <= nextMillionPeeny * MILLION * 10 ** decimals()) {
tempPeenyDistributed += peenyAtCurrentExchangeRate;
estimatedPeeny += peenyAtCurrentExchangeRate;
donation -= donation;
} else {
estimatedPeeny += nextMillionPeeny * MILLION * 10 ** decimals() - tempPeenyDistributed;
donation -= (nextMillionPeeny * MILLION * 10 ** decimals() - tempPeenyDistributed) * tempExchangeRate / 10**12;
tempPeenyDistributed = nextMillionPeeny * MILLION * 10 ** decimals();
}
// tempExchangeRate = (tempExchangeRate * 120 / 100);
numLoops++;
}
return estimatedPeeny;
}
function donationInWeiToPeeny(uint256 donation) view public returns (uint256) {
return _donationInWeiToPeeny(donation, peenyReserved);
}
function issue() onlyOwner public payable {
address funderAddress = contributors[contributors.length- 1];
Funder memory funder = contributions[funderAddress];
transfer(funderAddress, funder.numberOfCoins);
peenyDistributed += funder.numberOfCoins;
emit Issue(funder);
contributors.pop();
delete contributions[funderAddress];
}
function withdrawPartialFunds(uint256 balance) onlyOwner public {
require(address(this).balance > 0, "withdrawFunds(): Cannot withdraw when balance is zero.");
payable(owner()).transfer(balance);
}
function withdrawFunds() onlyOwner public {
require(address(this).balance > 0, "withdrawFunds(): Cannot withdraw when balance is zero.");
uint balance = address(this).balance;
payable(owner()).transfer(balance);
}
// Just in case someone tries to be mean.
function setMinContributionWei(uint256 minContribution) onlyOwner public {
minimumContributionWei = minContribution;
}
function closeIco() onlyOwner public {
icoOpen = false;
}
function reopenIco() onlyOwner public {
icoOpen = true;
}
// The minimum amount of value allowed in a contribute() call.
function getMinimumContribution() public view returns (uint256) {
return minimumContributionWei;
}
}
{
"compilationTarget": {
"Peeny.sol": "Peeny"
},
"evmVersion": "london",
"libraries": {},
"metadata": {
"bytecodeHash": "ipfs"
},
"optimizer": {
"enabled": false,
"runs": 200
},
"remappings": []
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