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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);
}
/**
@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);
}
/*
@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;
}
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];
}
spender cannot be the zero address.
*/
function approve(address spender, uint256 amount) public virtual override returns (bool) {
_approve(_msgSender(), spender, 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
@dev Moves tokens amount from sender to recipient.
This is 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");
/** @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:
to cannot be the zero address.
*/
function _mint(address account, uint256 amount) internal virtual {
require(account != address(0), "ERC20: mint to the zero address");
@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");
@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");
@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 to 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 Implementation of the ERC20Decimals. Extension of {ERC20} that adds decimals storage slot.
*/
abstract contract ERC20Decimals is ERC20 {
uint8 private immutable _decimals;
/**
@dev Sets the value of the decimals. This value is immutable, it can only be
set once during construction.
*/
constructor(uint8 decimals_) { decimals = decimals;
}
function decimals() public view virtual override returns (uint8) {
return _decimals;
}
}
@dev Implementation of the ERC20Mintable. Extension of {ERC20} that adds a minting behaviour.
*/
abstract contract ERC20Mintable is ERC20 {
// indicates if minting is finished
bool private _mintingFinished = false;
/**
@dev Emitted during finish minting
*/
event MintFinished();
/**
@dev Tokens can be minted only before minting finished.
*/
modifier canMint() {
require(!_mintingFinished, "ERC20Mintable: Minting is finished");
_;
}
/**
@return if minting is finished or not.
*/
function mintingFinished() external view returns (bool) {
return _mintingFinished;
}
WARNING: it allows everyone to finish minting. Access controls MUST be defined in derived contracts.
*/
function finishMinting() external canMint {
_finishMinting();
}
/**
@dev Function to stop minting new tokens.
*/
function _finishMinting() internal virtual {
_mintingFinished = true;
emit MintFinished();
}
}
interface IPayable {
function pay(string memory serviceName) external payable;
}
@dev Initializes the contract setting the deployer as the initial owner.
*/
constructor() {
address msgSender = _msgSender();
_owner = msgSender;
emit OwnershipTransferred(address(0), 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 {
emit OwnershipTransferred(_owner, address(0));
_owner = 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");
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
}
NOTE: restricting access to owner only. See {ERC20Mintable-mint}.
@param account The address that will receive the minted tokens
@param amount The amount of tokens to mint
*/
function _mint(address account, uint256 amount) internal override(ERC20, ERC20Capped) onlyOwner {
super._mint(account, amount);
}
// File: @openzeppelin/contracts/token/ERC20/IERC20.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
@dev Interface of the ERC20 standard as defined in the EIP.
/
interface IERC20 {
/*
*/
function totalSupply() external view returns (uint256);
/**
account.*/
function balanceOf(address account) external view returns (uint256);
/**
amounttokens from the caller's account torecipient.*/
function transfer(address recipient, uint256 amount) external returns (bool);
/**
spenderwill beownerthrough {transferFrom}. This is*/
function allowance(address owner, address spender) external view returns (uint256);
/**
amountas the allowance ofspenderover the caller's tokens.*/
function approve(address spender, uint256 amount) external returns (bool);
/**
amounttokens fromsendertorecipientusing theamountis then deducted from the caller's*/
function transferFrom(
address sender,
address recipient,
uint256 amount
) external returns (bool);
/**
valuetokens are moved from one account (from) toto).valuemay be zero.*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
spenderfor anowneris set byvalueis the new allowance.*/
event Approval(address indexed owner, address indexed spender, uint256 value);
}
/**
@dev Interface for the optional metadata functions from the ERC20 standard.
Available since v4.1.
/
interface IERC20Metadata is IERC20 {
/*
*/
function name() external view returns (string memory);
/**
*/
function symbol() external view returns (string memory);
/**
*/
function decimals() external view returns (uint8);
}
/*
@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) {
this; // silence state mutability warning without generating bytecode - see Allow comments to ignore compiler warnings. ethereum/solidity#2691
return msg.data;
}
}
/**
@dev Implementation of the {IERC20} interface.
This implementation is agnostic to the way tokens are created. This means
that a supply mechanism has to be added in a derived contract using {_mint}.
For a generic mechanism see {ERC20PresetMinterPauser}.
TIP: For a detailed writeup see our guide
https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
to implement supply mechanisms].
We have followed general OpenZeppelin guidelines: functions revert instead
of returning
falseon failure. This behavior is nonetheless conventionaland 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;
/**
*/
constructor(string memory name_, string memory symbol_) {
name = name;
symbol = symbol;
}
/**
*/
function name() public view virtual override returns (string memory) {
return _name;
}
/**
*/
function symbol() public view virtual override returns (string memory) {
return _symbol;
}
/**
decimalsequals2, a balance of505tokens should5,05(505 / 10 ** 2).*/
function decimals() public view virtual override returns (uint8) {
return 18;
}
/**
*/
function totalSupply() public view virtual override returns (uint256) {
return _totalSupply;
}
/**
*/
function balanceOf(address account) public view virtual override returns (uint256) {
return _balances[account];
}
/**
recipientcannot be the zero address.amount.*/
function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
_transfer(_msgSender(), recipient, amount);
return true;
}
/**
*/
function allowance(address owner, address spender) public view virtual override returns (uint256) {
return _allowances[owner][spender];
}
/**
spendercannot 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:
senderandrecipientcannot be the zero address.sendermust have a balance of at leastamount.sender's tokens of at leastamount.*/
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");
_approve(sender, _msgSender(), currentAllowance - amount);
return true;
}
/**
spenderby the caller.spendercannot 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
spenderby 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:
spendercannot be the zero address.spendermust have allowance for the caller of at leastsubtractedValue.*/
function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
uint256 currentAllowance = _allowances[_msgSender()][spender];
require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
_approve(_msgSender(), spender, currentAllowance - subtractedValue);
return true;
}
/**
@dev Moves tokens
amountfromsendertorecipient.This is 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:
sendercannot be the zero address.recipientcannot be the zero address.sendermust have a balance of at leastamount.*/
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");
_balances[sender] = senderBalance - amount;
_balances[recipient] += amount;
emit Transfer(sender, recipient, amount);
}
/** @dev Creates
amounttokens and assigns them toaccount, increasingthe total supply.
Emits a {Transfer} event with
fromset to the zero address.Requirements:
tocannot 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);
}
/**
@dev Destroys
amounttokens fromaccount, reducing thetotal supply.
Emits a {Transfer} event with
toset to the zero address.Requirements:
accountcannot be the zero address.accountmust have at leastamounttokens.*/
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");
_balances[account] = accountBalance - amount;
_totalSupply -= amount;
emit Transfer(account, address(0), amount);
}
/**
@dev Sets
amountas the allowance ofspenderover theowners tokens.This internal function is equivalent to
approve, and can be used toe.g. set automatic allowances for certain subsystems, etc.
Emits an {Approval} event.
Requirements:
ownercannot be the zero address.spendercannot 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);
}
/**
fromandtoare both non-zero,amountoffrom's tokensto.fromis zero,amounttokens will be minted forto.tois zero,amountoffrom's tokens will be burned.fromandtoare never both zero.*/
function _beforeTokenTransfer(
address from,
address to,
uint256 amount
) internal virtual {}
}
/**
@title ERC20Decimals
@dev Implementation of the ERC20Decimals. Extension of {ERC20} that adds decimals storage slot.
*/
abstract contract ERC20Decimals is ERC20 {
uint8 private immutable _decimals;
/**
decimals. This value is immutable, it can only be*/
constructor(uint8 decimals_) {
decimals = decimals;
}
function decimals() public view virtual override returns (uint8) {
return _decimals;
}
}
/**
@title ERC20Mintable
@dev Implementation of the ERC20Mintable. Extension of {ERC20} that adds a minting behaviour.
*/
abstract contract ERC20Mintable is ERC20 {
// indicates if minting is finished
bool private _mintingFinished = false;
/**
*/
event MintFinished();
/**
*/
modifier canMint() {
require(!_mintingFinished, "ERC20Mintable: Minting is finished");
_;
}
/**
*/
function mintingFinished() external view returns (bool) {
return _mintingFinished;
}
/**
*/
function mint(address account, uint256 amount) external canMint {
_mint(account, amount);
}
/**
*/
function finishMinting() external canMint {
_finishMinting();
}
/**
@dev Function to stop minting new tokens.
*/
function _finishMinting() internal virtual {
_mintingFinished = true;
emit MintFinished();
}
}
interface IPayable {
function pay(string memory serviceName) external payable;
}
/**
*/
abstract contract ServicePayer {
constructor(address payable receiver, string memory serviceName) payable {
IPayable(receiver).pay{value: msg.value}(serviceName);
}
}
/**
@dev Extension of {ERC20} that adds a cap to the supply of tokens.
*/
abstract contract ERC20Capped is ERC20 {
uint256 private immutable _cap;
/**
cap. This value is immutable, it can only be*/
constructor(uint256 cap_) {
require(cap_ > 0, "ERC20Capped: cap is 0");
cap = cap;
}
/**
*/
function cap() public view virtual returns (uint256) {
return _cap;
}
/**
*/
function _mint(address account, uint256 amount) internal virtual override {
require(ERC20.totalSupply() + amount <= cap(), "ERC20Capped: cap exceeded");
super._mint(account, amount);
}
}
/**
@dev Extension of {ERC20} that allows token holders to destroy both their own
tokens and those that they have an allowance for, in a way that can be
recognized off-chain (via event analysis).
/
abstract contract ERC20Burnable is Context, ERC20 {
/*
amounttokens from the caller.*/
function burn(uint256 amount) public virtual {
_burn(_msgSender(), amount);
}
/**
amounttokens fromaccount, deducting from the caller'saccounts's tokens of at leastamount.*/
function burnFrom(address account, uint256 amount) public virtual {
uint256 currentAllowance = allowance(account, _msgSender());
require(currentAllowance >= amount, "ERC20: burn amount exceeds allowance");
_approve(account, _msgSender(), currentAllowance - amount);
_burn(account, amount);
}
}
/**
@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 tothe owner.
*/
abstract contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
*/
constructor() {
address msgSender = _msgSender();
_owner = msgSender;
emit OwnershipTransferred(address(0), msgSender);
}
/**
*/
function owner() public view virtual returns (address) {
return _owner;
}
/**
*/
modifier onlyOwner() {
require(owner() == _msgSender(), "Ownable: caller is not the owner");
_;
}
/**
onlyOwnerfunctions anymore. Can only be called by the current owner.*/
function renounceOwnership() public virtual onlyOwner {
emit OwnershipTransferred(_owner, address(0));
_owner = address(0);
}
/**
newOwner).*/
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
}
/**
@title CommonERC20
@author Veshi
@dev Implementation of the CommonERC20
*/
contract CommonERC20 is ERC20Decimals, ERC20Capped, ERC20Mintable, ERC20Burnable, Ownable, ServicePayer {
constructor(
string memory name_,
string memory symbol_,
uint8 decimals_,
uint256 cap_,
uint256 initialBalance_,
address payable feeReceiver_
)
payable
ERC20(name_, symbol_)
ERC20Decimals(decimals_)
ERC20Capped(cap_)
ServicePayer(feeReceiver_, "CommonERC20")
{
// Immutable variables cannot be read during contract creation time
// Allow reading immutable variables during construction ethereum/solidity#10463
require(initialBalance_ <= cap_, "ERC20Capped: Cap exceeded");
ERC20._mint(msgSender(), initialBalance);
}
function decimals() public view virtual override(ERC20, ERC20Decimals) returns (uint8) {
return super.decimals();
}
/**
*/
function _mint(address account, uint256 amount) internal override(ERC20, ERC20Capped) onlyOwner {
super._mint(account, amount);
}
/**
*/
function _finishMinting() internal override onlyOwner {
super._finishMinting();
}
}
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