// This contract was copied from https://github.com/OpenZeppelin/openzeppelin-contracts/
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/**
* @dev Wrappers over Solidity's arithmetic operations with added overflow
* checks.
*
* Arithmetic operations in Solidity wrap on overflow. This can easily result
* in bugs, because programmers usually assume that an overflow raises an
* error, which is the standard behavior in high level programming languages.
* `SafeMath` restores this intuition by reverting the transaction when an
* operation overflows.
*
* Using this library instead of the unchecked operations eliminates an entire
* class of bugs, so it's recommended to use it always.
*/
library SafeMath {
/**
* @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) {
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
/**
* @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 sub(a, b, "SafeMath: subtraction overflow");
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b <= a, errorMessage);
uint256 c = a - b;
return c;
}
/**
* @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) {
// 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 0;
}
uint256 c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
return c;
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts 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) internal pure returns (uint256) {
return div(a, b, "SafeMath: division by zero");
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts 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) {
require(b > 0, errorMessage);
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts 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 mod(a, b, "SafeMath: modulo by zero");
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts with custom message 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, string memory errorMessage) internal pure returns (uint256) {
require(b != 0, errorMessage);
return a % b;
}
}
// This contract was copied from https://github.com/OpenZeppelin/openzeppelin-contracts/
/**
* @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);
}
// This contract was copied from https://github.com/OpenZeppelin/openzeppelin-contracts/
/*
* @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 GSN 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 payable) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes memory) {
this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
return msg.data;
}
}
// Copyright (c) 2019-2020 revolutionpopuli.com
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
// This contract was copied from https://github.com/OpenZeppelin/openzeppelin-contracts/
/**
* @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 () internal {
address msgSender = _msgSender();
_owner = msgSender;
emit OwnershipTransferred(address(0), msgSender);
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view 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;
}
}
// Copyright (c) 2019-2020 revolutionpopuli.com
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
// This contract was copied from https://github.com/OpenZeppelin/openzeppelin-contracts/
/**
* @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 `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 {
using SafeMath for uint256;
mapping (address => uint256) private _balances;
mapping (address => mapping (address => uint256)) private _allowances;
uint256 private _totalSupply;
string private _name;
string private _symbol;
uint8 private _decimals;
/**
* @dev Sets the values for {name} and {symbol}, initializes {decimals} with
* a default value of 18.
*
* To select a different value for {decimals}, use {_setupDecimals}.
*
* All three of these values are immutable: they can only be set once during
* construction.
*/
constructor (string memory name_, string memory symbol_) public {
_name = name_;
_symbol = symbol_;
_decimals = 18;
}
/**
* @dev Returns the name of the token.
*/
function name() public view returns (string memory) {
return _name;
}
/**
* @dev Returns the symbol of the token, usually a shorter version of the
* name.
*/
function symbol() public view 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 {_setupDecimals} is
* called.
*
* 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 returns (uint8) {
return _decimals;
}
/**
* @dev See {IERC20-totalSupply}.
*/
function totalSupply() public view override returns (uint256) {
return _totalSupply;
}
/**
* @dev See {IERC20-balanceOf}.
*/
function balanceOf(address account) public view 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);
_approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
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].add(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) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
return true;
}
/**
* @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");
_beforeTokenTransfer(sender, recipient, amount);
_balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
_balances[recipient] = _balances[recipient].add(amount);
emit Transfer(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:
*
* - `to` 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 = _totalSupply.add(amount);
_balances[account] = _balances[account].add(amount);
emit Transfer(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);
_balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
_totalSupply = _totalSupply.sub(amount);
emit Transfer(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 Sets {decimals} to a value other than the default one of 18.
*
* WARNING: This function should only be called from the constructor. Most
* applications that interact with token contracts will not expect
* {decimals} to ever change, and may work incorrectly if it does.
*/
function _setupDecimals(uint8 decimals_) internal {
_decimals = decimals_;
}
/**
* @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 { }
}
// Copyright (c) 2019-2020 revolutionpopuli.com
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
// This contract was copied from https://github.com/OpenZeppelin/openzeppelin-contracts/
/**
* @dev Contract module which allows children to implement an emergency stop
* mechanism that can be triggered by an authorized account.
*
* This module is used through inheritance. It will make available the
* modifiers `whenNotPaused` and `whenPaused`, which can be applied to
* the functions of your contract. Note that they will not be pausable by
* simply including this module, only once the modifiers are put in place.
*/
abstract contract Pausable is Context {
/**
* @dev Emitted when the pause is triggered by `account`.
*/
event Paused(address account);
/**
* @dev Emitted when the pause is lifted by `account`.
*/
event Unpaused(address account);
bool private _paused;
/**
* @dev Initializes the contract in unpaused state.
*/
constructor () internal {
_paused = false;
}
/**
* @dev Returns true if the contract is paused, and false otherwise.
*/
function paused() public view returns (bool) {
return _paused;
}
/**
* @dev Modifier to make a function callable only when the contract is not paused.
*
* Requirements:
*
* - The contract must not be paused.
*/
modifier whenNotPaused() virtual {
require(!_paused, "Pausable: paused");
_;
}
/**
* @dev Modifier to make a function callable only when the contract is paused.
*
* Requirements:
*
* - The contract must be paused.
*/
modifier whenPaused() {
require(_paused, "Pausable: not paused");
_;
}
/**
* @dev Triggers stopped state.
*
* Requirements:
*
* - The contract must not be paused.
*/
function _pause() internal virtual whenNotPaused {
_paused = true;
emit Paused(_msgSender());
}
/**
* @dev Returns to normal state.
*
* Requirements:
*
* - The contract must be paused.
*/
function _unpause() internal virtual whenPaused {
_paused = false;
emit Unpaused(_msgSender());
}
}
contract PausableWithException is Pausable, Ownable {
mapping(address => bool) public exceptions;
modifier whenNotPaused() override {
require(!paused() || hasException(_msgSender()), "Pausable: paused (and no exception)");
_;
}
modifier whenNotPausedWithoutException() {
require(!paused(), "Pausable: paused");
_;
}
function hasException(address _account) public view returns (bool) {
return exceptions[_account];
}
function setPausableException(address _account, bool _status) external whenNotPaused onlyOwner {
exceptions[_account] = _status;
}
}
contract Token is ERC20, PausableWithException {
constructor(string memory name, string memory symbol) ERC20(name, symbol) {}
function pause() public onlyOwner {
super._pause();
}
function unpause() public onlyOwner {
super._unpause();
}
function transfer(address recipient, uint256 amount) public override whenNotPaused returns (bool) {
return super.transfer(recipient, amount);
}
function transferFrom(address sender, address recipient, uint256 amount) public override whenNotPausedWithoutException returns (bool) {
return super.transferFrom(sender, recipient, amount);
}
function mint(address account, uint amount) public onlyOwner whenNotPaused {
_mint(account, amount);
}
function burn(address account, uint amount) public onlyOwner {
_burn(account, amount);
}
}
// This contract was copied from https://github.com/OpenZeppelin/openzeppelin-contracts/
// This contract was copied from https://github.com/OpenZeppelin/openzeppelin-contracts/
/**
* @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;
// solhint-disable-next-line no-inline-assembly
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");
// solhint-disable-next-line avoid-low-level-calls, avoid-call-value
(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");
// solhint-disable-next-line avoid-low-level-calls
(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");
// solhint-disable-next-line avoid-low-level-calls
(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 v3.3._
*/
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 v3.3._
*/
function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
require(isContract(target), "Address: delegate call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = target.delegatecall(data);
return _verifyCallResult(success, returndata, errorMessage);
}
function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private 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
// solhint-disable-next-line no-inline-assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
/**
* @title SafeERC20
* @dev Wrappers around ERC20 operations that throw on failure (when the token
* contract returns false). Tokens that return no value (and instead revert or
* throw on failure) are also supported, non-reverting calls are assumed to be
* successful.
* To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
* which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
*/
library SafeERC20 {
using SafeMath for uint256;
using Address for address;
function safeTransfer(IERC20 token, address to, uint256 value) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
}
function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
}
/**
* @dev Deprecated. This function has issues similar to the ones found in
* {IERC20-approve}, and its usage is discouraged.
*
* Whenever possible, use {safeIncreaseAllowance} and
* {safeDecreaseAllowance} instead.
*/
function safeApprove(IERC20 token, address spender, uint256 value) internal {
// safeApprove should only be called when setting an initial allowance,
// or when resetting it to zero. To increase and decrease it, use
// 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
// solhint-disable-next-line max-line-length
require((value == 0) || (token.allowance(address(this), spender) == 0),
"SafeERC20: approve from non-zero to non-zero allowance"
);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
}
function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 newAllowance = token.allowance(address(this), spender).add(value);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
/**
* @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
* on the return value: the return value is optional (but if data is returned, it must not be false).
* @param token The token targeted by the call.
* @param data The call data (encoded using abi.encode or one of its variants).
*/
function _callOptionalReturn(IERC20 token, bytes memory data) private {
// We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
// we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
// the target address contains contract code and also asserts for success in the low-level call.
bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
if (returndata.length > 0) { // Return data is optional
// solhint-disable-next-line max-line-length
require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
}
}
}
// Copyright (c) 2019-2020 revolutionpopuli.com
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
// Copyright (c) 2019-2020 revolutionpopuli.com
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
contract TokenEscrow is Ownable {
using SafeMath for uint256;
using SafeERC20 for Token;
struct Share {
uint256 proportion;
uint256 periods;
uint256 periodLength;
}
uint256 public unlockStart;
uint256 public totalShare;
mapping(address => Share) public shares;
mapping(address => uint256) public unlocked;
Token public token;
constructor(Token _token) {
token = _token;
}
function setUnlockStart(uint256 _unlockStart) external virtual onlyOwner {
require(unlockStart == 0, "unlockStart should be == 0");
require(_unlockStart >= block.timestamp, "_unlockStart should be >= block.timestamp");
unlockStart = _unlockStart;
}
function addShare(address _beneficiary, uint256 _proportion, uint256 _periods, uint256 _periodLength) external onlyOwner {
shares[_beneficiary] = Share(shares[_beneficiary].proportion.add(_proportion),_periods,_periodLength);
totalShare = totalShare.add(_proportion);
}
// If the time of freezing expired will return the funds to the owner.
function unlockFor(address _beneficiary) public {
require(unlockStart > 0, "unlockStart should be > 0");
require(
block.timestamp >= (unlockStart.add(shares[_beneficiary].periodLength)),
"block.timestamp should be >= (unlockStart.add(shares[_beneficiary].periodLength))"
);
uint256 share = shares[_beneficiary].proportion;
uint256 periodsSinceUnlockStart = ((block.timestamp).sub(unlockStart)).div(shares[_beneficiary].periodLength);
if (periodsSinceUnlockStart < shares[_beneficiary].periods) {
share = share.mul(periodsSinceUnlockStart).div(shares[_beneficiary].periods);
}
share = share.sub(unlocked[_beneficiary]);
if (share > 0) {
unlocked[_beneficiary] = unlocked[_beneficiary].add(share);
uint256 unlockedToken = token.balanceOf(address(this)).mul(share).div(totalShare);
totalShare = totalShare.sub(share);
token.safeTransfer(_beneficiary,unlockedToken);
}
}
}
contract Creator {
Token public token = new Token('RevolutionPopuli ERC20 Token', 'RVP');
TokenEscrow public tokenEscrow;
constructor() {
token.transferOwnership(msg.sender);
}
function createTokenEscrow() external returns (TokenEscrow) {
tokenEscrow = new TokenEscrow(token);
tokenEscrow.transferOwnership(msg.sender);
return tokenEscrow;
}
}
contract TokenSale is Ownable {
using SafeMath for uint256;
using SafeERC20 for Token;
uint constant public MIN_ETH = 0.1 ether; // !!! for real ICO change to 1 ether
uint constant public WINDOW_DURATION = 23 hours; // !!! for real ICO change to 23 hours
uint constant public MARKETING_SHARE = 200000000 ether;
uint constant public TEAM_MEMBER_1_SHARE = 50000000 ether;
uint constant public TEAM_MEMBER_2_SHARE = 50000000 ether;
uint constant public TEAM_MEMBER_3_SHARE = 50000000 ether;
uint constant public TEAM_MEMBER_4_SHARE = 50000000 ether;
uint constant public REVPOP_FOUNDATION_SHARE = 200000000 ether;
uint constant public REVPOP_FOUNDATION_PERIOD_LENGTH = 365 days; // !!! for real ICO change to 365 days
uint constant public REVPOP_FOUNDATION_PERIODS = 10; // 10 years (!!! for real ICO it would be 10 years)
uint constant public REVPOP_COMPANY_SHARE = 200000000 ether;
uint constant public REVPOP_COMPANY_PERIOD_LENGTH = 365 days; // !!! for real ICO change to 365 days
uint constant public REVPOP_COMPANY_PERIODS = 10; // 10 years (!!! for real ICO it would be 10 years)
address[9] public wallets = [
// RevPop.org foundation
0x26be1e82026BB50742bBF765c8b1665bCB763c4c,
// RevPop company
0x4A2d3b4475dA7E634154F1868e689705bDCEEF4c,
// Marketing
0x73d3F88BF15EB48e94E6583968041cC850d61D62,
// Team member 1
0x1F3eFCe792f9744d919eee34d23e054631351eBc,
// Team member 2
0xEB7bb38D821219aE20d3Df7A80A161563CDe5f1b,
// Team member 3
0x9F3868cF5FEdb90Df9D9974A131dE6B56B3aA7Ca,
// Team member 4
0xE7320724CA4C20aEb193472D3082593f6c58A3C5,
// Unsold tokens taker
0xCde8311aa7AAbECDEf84179D93a04005C8C549c0,
// Beneficiarry
0x8B104136F8c1FC63fBA34cb46c42c7af5532f80e
];
Token public token; // The Token token itself
TokenEscrow public tokenEscrow;
uint public totalSupply; // Total Token amount created
uint public firstWindowStartTime; // Time of window 1 opening
uint public createPerFirstWindow; // Tokens sold in window 1
uint public otherWindowsStartTime; // Time of other windows opening
uint public numberOfOtherWindows; // Number of other windows
uint public createPerOtherWindow; // Tokens sold in each window after window 1
uint public totalBoughtTokens;
uint public totalRaisedETH;
uint public totalBulkPurchasedTokens;
uint public collectedUnsoldTokensBeforeWindow = 0;
bool public initialized = false;
bool public tokensPerPeriodAreSet = false;
bool public distributedShares = false;
bool public began = false;
bool public tokenSalePaused = false;
mapping(uint => uint) public dailyTotals;
mapping(uint => mapping(address => uint)) public userBuys;
mapping(uint => mapping(address => bool)) public claimed;
event LogBuy (uint window, address user, uint amount);
event LogClaim (uint window, address user, uint amount);
event LogCollect (uint amount);
event LogCollectUnsold (uint amount);
constructor(Creator creator) {
token = creator.token();
require(token.totalSupply() == 0, "Total supply of Token should be 0");
tokenEscrow = creator.createTokenEscrow();
require(tokenEscrow.owner() == address(this), "Invalid owner of the TokenEscrow");
require(tokenEscrow.unlockStart() == 0, "TokenEscrow.unlockStart should be 0");
}
function renounceOwnership() public override onlyOwner {
require(address(this).balance == 0, "address(this).balance should be == 0");
super.renounceOwnership();
}
function initialize(
uint _totalSupply,
uint _firstWindowStartTime,
uint _otherWindowsStartTime,
uint _numberOfOtherWindows
) public onlyOwner {
require(token.owner() == address(this), "Invalid owner of the Token");
token.setPausableException(address(tokenEscrow), true);
token.setPausableException(address(this), true);
token.setPausableException(wallets[2], true);
token.setPausableException(wallets[7], true);
require(initialized == false, "initialized should be == false");
require(_totalSupply > 0, "_totalSupply should be > 0");
require(_firstWindowStartTime < _otherWindowsStartTime, "_firstWindowStartTime should be < _otherWindowsStartTime");
require(_numberOfOtherWindows > 0, "_numberOfOtherWindows should be > 0");
require(_totalSupply > totalReservedTokens(), "_totalSupply should be more than totalReservedTokens()");
numberOfOtherWindows = _numberOfOtherWindows;
totalSupply = _totalSupply;
firstWindowStartTime = _firstWindowStartTime;
otherWindowsStartTime = _otherWindowsStartTime;
initialized = true;
token.mint(address(this), totalSupply);
}
function addBulkPurchasers(address[] memory _purchasers, uint[] memory _tokens) public onlyOwner {
require(initialized == true, "initialized should be == true");
require(tokensPerPeriodAreSet == false, "tokensPerPeriodAreSet should be == false");
uint count = _purchasers.length;
require(count > 0, "count should be > 0");
require(count == _tokens.length, "count should be == _tokens.length");
for (uint i = 0; i < count; i++) {
require(_tokens[i] > 0, "_tokens[i] should be > 0");
token.safeTransfer(_purchasers[i], _tokens[i]);
totalBulkPurchasedTokens = totalBulkPurchasedTokens.add(_tokens[i]);
}
require(
token.balanceOf(address(this)) > totalReservedTokens(),
"token.balanceOf(address(this)) should be > totalReservedTokens() after bulk purchases"
);
}
function setTokensPerPeriods(uint _firstPeriodTokens, uint _otherPeriodTokens) public onlyOwner {
require(initialized == true, "initialized should be == true");
require(began == false, "began should be == false");
tokensPerPeriodAreSet = true;
uint totalTokens = _firstPeriodTokens.add(_otherPeriodTokens.mul(numberOfOtherWindows));
require(
totalSupply.sub(totalReservedTokens()).sub(totalBulkPurchasedTokens) == totalTokens,
"totalSupply.sub(totalReservedTokens()).sub(totalBulkPurchasedTokens) should be == totalTokens"
);
createPerFirstWindow = _firstPeriodTokens;
createPerOtherWindow = _otherPeriodTokens;
}
function distributeShares() public onlyOwner {
require(tokensPerPeriodAreSet == true, "tokensPerPeriodAreSet should be == true");
require(distributedShares == false, "distributedShares should be == false");
distributedShares = true;
token.safeTransfer(address(tokenEscrow), REVPOP_COMPANY_SHARE.add(REVPOP_FOUNDATION_SHARE));
token.safeTransfer(wallets[2], MARKETING_SHARE);
token.safeTransfer(wallets[3], TEAM_MEMBER_1_SHARE);
token.safeTransfer(wallets[4], TEAM_MEMBER_2_SHARE);
token.safeTransfer(wallets[5], TEAM_MEMBER_3_SHARE);
token.safeTransfer(wallets[6], TEAM_MEMBER_4_SHARE);
tokenEscrow.addShare(wallets[0], 50, REVPOP_FOUNDATION_PERIODS, REVPOP_FOUNDATION_PERIOD_LENGTH);
tokenEscrow.addShare(wallets[1], 50, REVPOP_COMPANY_PERIODS, REVPOP_COMPANY_PERIOD_LENGTH);
tokenEscrow.setUnlockStart(time());
// We pause all transfers and minting.
// We allow to use transfer() function ONLY for tokenEscrow contract,
// because it is an escrow and it should allow to transfer tokens to a certain party.
pauseTokenTransfer();
}
function totalReservedTokens() internal pure returns (uint) {
return MARKETING_SHARE
.add(TEAM_MEMBER_1_SHARE)
.add(TEAM_MEMBER_2_SHARE)
.add(TEAM_MEMBER_3_SHARE)
.add(TEAM_MEMBER_4_SHARE)
.add(REVPOP_COMPANY_SHARE)
.add(REVPOP_FOUNDATION_SHARE);
}
function begin() public onlyOwner {
require(distributedShares == true, "distributedShares should be == true");
require(began == false, "began should be == false");
began = true;
}
function pauseTokenTransfer() public onlyOwner {
token.pause();
}
function unpauseTokenTransfer() public onlyOwner {
token.unpause();
}
function pauseTokenSale() public onlyOwner {
tokenSalePaused = true;
}
function unpauseTokenSale() public onlyOwner {
tokenSalePaused = false;
}
function burnTokens(address account, uint amount) public onlyOwner {
token.burn(account, amount);
}
function removePausableException(address _address) public onlyOwner {
token.setPausableException(_address, false);
}
function time() internal view returns (uint) {
return block.timestamp;
}
function today() public view returns (uint) {
return windowFor(time());
}
function windowDuration() public virtual pure returns (uint) {
return WINDOW_DURATION;
}
// Each window is windowDuration() (23 hours) long so that end-of-window rotates
// around the clock for all timezones.
function windowFor(uint timestamp) public view returns (uint) {
return timestamp < otherWindowsStartTime
? 0
: timestamp.sub(otherWindowsStartTime).div(windowDuration()).add(1);
}
function createOnWindow(uint window) public view returns (uint) {
return window == 0 ? createPerFirstWindow : createPerOtherWindow;
}
// This method provides the buyer some protections regarding which
// day the buy order is submitted and the maximum price prior to
// applying this payment that will be allowed.
function buyWithLimit(uint window, uint limit) public payable {
require(began == true, "began should be == true");
require(tokenSalePaused == false, "tokenSalePaused should be == false");
require(time() >= firstWindowStartTime, "time() should be >= firstWindowStartTime");
require(today() <= numberOfOtherWindows, "today() should be <= numberOfOtherWindows");
require(msg.value >= MIN_ETH, "msg.value should be >= MIN_ETH");
require(window >= today(), "window should be >= today()");
require(window <= numberOfOtherWindows, "window should be <= numberOfOtherWindows");
if (limit != 0) {
require(dailyTotals[window] <= limit, "dailyTotals[window] should be <= limit");
}
userBuys[window][msg.sender] = userBuys[window][msg.sender].add(msg.value);
dailyTotals[window] = dailyTotals[window].add(msg.value);
totalRaisedETH = totalRaisedETH.add(msg.value);
emit LogBuy(window, msg.sender, msg.value);
}
function buy() public payable {
buyWithLimit(today(), 0);
}
fallback() external payable {
buy();
}
receive() external payable {
buy();
}
function claim(uint window) public {
require(began == true, "began should be == true");
require(today() > window, "today() should be > window");
if (claimed[window][msg.sender] || dailyTotals[window] == 0 || userBuys[window][msg.sender] == 0) {
return;
}
// 100 ether below is 100% * 10^18
uint256 userEthShare = userBuys[window][msg.sender].mul(100 ether).div(dailyTotals[window]);
uint256 reward = (createOnWindow(window)).mul(userEthShare).div(100 ether);
totalBoughtTokens = totalBoughtTokens.add(reward);
claimed[window][msg.sender] = true;
token.safeTransfer(msg.sender, reward);
emit LogClaim(window, msg.sender, reward);
}
function claimAll() public {
require(began == true, "began should be == true");
for (uint i = 0; i < today(); i++) {
claim(i);
}
}
// Crowdsale owners can collect ETH number of times
function collect() public {
require(began == true, "began should be == true");
require(today() > 0, "today() should be > 0");
// Prevent recycling during window 0
uint balance = address(this).balance;
payable(wallets[8]).transfer(address(this).balance);
emit LogCollect(balance);
}
function collectUnsoldTokens(uint window) public {
require(began == true, "began should be == true");
require(today() > 0, "today() should be > 0");
require(window <= today(), "window should be <= today()");
require(window > collectedUnsoldTokensBeforeWindow, "window should be > collectedUnsoldTokensBeforeWindow");
uint unsoldTokens = 0;
for (uint i = collectedUnsoldTokensBeforeWindow; i < window; i++) {
uint dailyTotal = dailyTotals[i];
if (dailyTotal == 0) {
unsoldTokens = unsoldTokens.add(i == 0 ? createPerFirstWindow : createPerOtherWindow);
}
}
collectedUnsoldTokensBeforeWindow = window;
if (unsoldTokens > 0) {
token.safeTransfer(wallets[7], unsoldTokens);
}
emit LogCollectUnsold(unsoldTokens);
}
}
{
"compilationTarget": {
"Token.sol": "Token"
},
"evmVersion": "istanbul",
"libraries": {},
"metadata": {
"bytecodeHash": "ipfs"
},
"optimizer": {
"enabled": true,
"runs": 200
},
"remappings": []
}
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