Contract Name:
MetacadePresaleV2
Contract Source Code:
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)
pragma solidity ^0.8.0;
import "../utils/Context.sol";
/**
* @dev Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* specific functions.
*
* By default, the owner account will be the one that deploys the contract. This
* can later be changed with {transferOwnership}.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be applied to your functions to restrict their use to
* the owner.
*/
abstract contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor() {
_transferOwnership(_msgSender());
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
_checkOwner();
_;
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view virtual returns (address) {
return _owner;
}
/**
* @dev Throws if the sender is not the owner.
*/
function _checkOwner() internal view virtual {
require(owner() == _msgSender(), "Ownable: caller is not the owner");
}
/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions anymore. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby removing any functionality that is only available to the owner.
*/
function renounceOwnership() public virtual onlyOwner {
_transferOwnership(address(0));
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
_transferOwnership(newOwner);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Internal function without access restriction.
*/
function _transferOwnership(address newOwner) internal virtual {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (security/Pausable.sol)
pragma solidity ^0.8.0;
import "../utils/Context.sol";
/**
* @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() {
_paused = false;
}
/**
* @dev Modifier to make a function callable only when the contract is not paused.
*
* Requirements:
*
* - The contract must not be paused.
*/
modifier whenNotPaused() {
_requireNotPaused();
_;
}
/**
* @dev Modifier to make a function callable only when the contract is paused.
*
* Requirements:
*
* - The contract must be paused.
*/
modifier whenPaused() {
_requirePaused();
_;
}
/**
* @dev Returns true if the contract is paused, and false otherwise.
*/
function paused() public view virtual returns (bool) {
return _paused;
}
/**
* @dev Throws if the contract is paused.
*/
function _requireNotPaused() internal view virtual {
require(!paused(), "Pausable: paused");
}
/**
* @dev Throws if the contract is not paused.
*/
function _requirePaused() internal view virtual {
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());
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (security/ReentrancyGuard.sol)
pragma solidity ^0.8.0;
/**
* @dev Contract module that helps prevent reentrant calls to a function.
*
* Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
* available, which can be applied to functions to make sure there are no nested
* (reentrant) calls to them.
*
* Note that because there is a single `nonReentrant` guard, functions marked as
* `nonReentrant` may not call one another. This can be worked around by making
* those functions `private`, and then adding `external` `nonReentrant` entry
* points to them.
*
* TIP: If you would like to learn more about reentrancy and alternative ways
* to protect against it, check out our blog post
* https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
*/
abstract contract ReentrancyGuard {
// Booleans are more expensive than uint256 or any type that takes up a full
// word because each write operation emits an extra SLOAD to first read the
// slot's contents, replace the bits taken up by the boolean, and then write
// back. This is the compiler's defense against contract upgrades and
// pointer aliasing, and it cannot be disabled.
// The values being non-zero value makes deployment a bit more expensive,
// but in exchange the refund on every call to nonReentrant will be lower in
// amount. Since refunds are capped to a percentage of the total
// transaction's gas, it is best to keep them low in cases like this one, to
// increase the likelihood of the full refund coming into effect.
uint256 private constant _NOT_ENTERED = 1;
uint256 private constant _ENTERED = 2;
uint256 private _status;
constructor() {
_status = _NOT_ENTERED;
}
/**
* @dev Prevents a contract from calling itself, directly or indirectly.
* Calling a `nonReentrant` function from another `nonReentrant`
* function is not supported. It is possible to prevent this from happening
* by making the `nonReentrant` function external, and making it call a
* `private` function that does the actual work.
*/
modifier nonReentrant() {
_nonReentrantBefore();
_;
_nonReentrantAfter();
}
function _nonReentrantBefore() private {
// On the first call to nonReentrant, _status will be _NOT_ENTERED
require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
// Any calls to nonReentrant after this point will fail
_status = _ENTERED;
}
function _nonReentrantAfter() private {
// By storing the original value once again, a refund is triggered (see
// https://eips.ethereum.org/EIPS/eip-2200)
_status = _NOT_ENTERED;
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)
pragma solidity ^0.8.0;
/**
* @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
* https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
*
* Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
* presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
* need to send a transaction, and thus is not required to hold Ether at all.
*/
interface IERC20Permit {
/**
* @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
* given ``owner``'s signed approval.
*
* IMPORTANT: The same issues {IERC20-approve} has related to transaction
* ordering also apply here.
*
* Emits an {Approval} event.
*
* Requirements:
*
* - `spender` cannot be the zero address.
* - `deadline` must be a timestamp in the future.
* - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
* over the EIP712-formatted function arguments.
* - the signature must use ``owner``'s current nonce (see {nonces}).
*
* For more information on the signature format, see the
* https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
* section].
*/
function permit(
address owner,
address spender,
uint256 value,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) external;
/**
* @dev Returns the current nonce for `owner`. This value must be
* included whenever a signature is generated for {permit}.
*
* Every successful call to {permit} increases ``owner``'s nonce by one. This
* prevents a signature from being used multiple times.
*/
function nonces(address owner) external view returns (uint256);
/**
* @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
*/
// solhint-disable-next-line func-name-mixedcase
function DOMAIN_SEPARATOR() external view returns (bytes32);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)
pragma solidity ^0.8.0;
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @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 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 `to`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address to, 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 `from` to `to` 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 from,
address to,
uint256 amount
) external returns (bool);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/utils/SafeERC20.sol)
pragma solidity ^0.8.0;
import "../IERC20.sol";
import "../extensions/draft-IERC20Permit.sol";
import "../../../utils/Address.sol";
/**
* @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 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'
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) + value;
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
function safeDecreaseAllowance(
IERC20 token,
address spender,
uint256 value
) internal {
unchecked {
uint256 oldAllowance = token.allowance(address(this), spender);
require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
uint256 newAllowance = oldAllowance - value;
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
}
function safePermit(
IERC20Permit token,
address owner,
address spender,
uint256 value,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) internal {
uint256 nonceBefore = token.nonces(owner);
token.permit(owner, spender, value, deadline, v, r, s);
uint256 nonceAfter = token.nonces(owner);
require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
}
/**
* @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
require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
}
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol)
pragma solidity ^0.8.1;
/**
* @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
* ====
*
* [IMPORTANT]
* ====
* You shouldn't rely on `isContract` to protect against flash loan attacks!
*
* Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
* like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
* constructor.
* ====
*/
function isContract(address account) internal view returns (bool) {
// This method relies on extcodesize/address.code.length, which returns 0
// for contracts in construction, since the code is only stored at the end
// of the constructor execution.
return account.code.length > 0;
}
/**
* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
* `recipient`, forwarding all available gas and reverting on errors.
*
* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
* of certain opcodes, possibly making contracts go over the 2300 gas limit
* imposed by `transfer`, making them unable to receive funds via
* `transfer`. {sendValue} removes this limitation.
*
* https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* {ReentrancyGuard} or the
* https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
(bool success, ) = recipient.call{value: amount}("");
require(success, "Address: unable to send value, recipient may have reverted");
}
/**
* @dev Performs a Solidity function call using a low level `call`. A
* plain `call` is an unsafe replacement for a function call: use this
* function instead.
*
* If `target` reverts with a revert reason, it is bubbled up by this
* function (like regular Solidity function calls).
*
* Returns the raw returned data. To convert to the expected return value,
* use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
*
* Requirements:
*
* - `target` must be a contract.
* - calling `target` with `data` must not revert.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
return functionCallWithValue(target, data, 0, "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");
(bool success, bytes memory returndata) = target.call{value: value}(data);
return verifyCallResultFromTarget(target, 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) {
(bool success, bytes memory returndata) = target.staticcall(data);
return verifyCallResultFromTarget(target, success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
return functionDelegateCall(target, data, "Address: low-level delegate call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
(bool success, bytes memory returndata) = target.delegatecall(data);
return verifyCallResultFromTarget(target, success, returndata, errorMessage);
}
/**
* @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
* the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
*
* _Available since v4.8._
*/
function verifyCallResultFromTarget(
address target,
bool success,
bytes memory returndata,
string memory errorMessage
) internal view returns (bytes memory) {
if (success) {
if (returndata.length == 0) {
// only check isContract if the call was successful and the return data is empty
// otherwise we already know that it was a contract
require(isContract(target), "Address: call to non-contract");
}
return returndata;
} else {
_revert(returndata, errorMessage);
}
}
/**
* @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
* revert reason or using the provided one.
*
* _Available since v4.3._
*/
function verifyCallResult(
bool success,
bytes memory returndata,
string memory errorMessage
) internal pure returns (bytes memory) {
if (success) {
return returndata;
} else {
_revert(returndata, errorMessage);
}
}
function _revert(bytes memory returndata, string memory errorMessage) private pure {
// 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
/// @solidity memory-safe-assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
pragma solidity ^0.8.0;
/**
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
}
// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.0;
interface IAggregator {
function latestRoundData()
external
view
returns (
uint80 roundId,
int256 answer,
uint256 startedAt,
uint256 updatedAt,
uint80 answeredInRound
);
}
// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.17;
interface IMetacadePresaleV1 {
function totalTokensSold() external view returns(uint256);
function userDeposits(address) external view returns(uint256);
}
// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.17;
interface IMetacadePresaleV2 {
event SaleTimeSet(uint256 _start, uint256 _end, uint256 timestamp);
event TokensBought(
address indexed user,
uint256 indexed tokensBought,
uint256 amountPaid,
uint256 timestamp
);
event TokensClaimed(
address indexed user,
uint256 amount,
uint256 timestamp
);
event ClaimStartUpdated(
uint256 prevValue,
uint256 newValue,
uint256 timestamp
);
}
// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.17;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/security/Pausable.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "../interfaces/v1/IMetacadePresale.v1.sol";
import "../interfaces/v2/IMetacadePresale.v2.sol";
import "../interfaces/IAggregator.sol";
contract MetacadePresaleV2 is IMetacadePresaleV2, Pausable, Ownable, ReentrancyGuard {
using SafeERC20 for IERC20;
address public immutable saleToken;
IMetacadePresaleV1 public immutable previousPresale;
IMetacadePresaleV1 public immutable betaPresale;
uint256 public totalTokensSold;
uint256 public startTime;
uint256 public endTime;
uint256 public claimStart;
uint256 public currentStep;
uint256[9] public token_amount;
uint256[9] public token_price;
uint8 constant maxStepIndex = 8;
bool isSynchronized;
IERC20 public USDTInterface;
IAggregator public aggregatorInterface;
mapping(address => uint256) _userDeposits;
mapping(address => bool) public hasClaimed;
mapping(address => bool) public blacklist;
modifier checkSaleState(uint256 amount) {
require(
block.timestamp >= startTime && block.timestamp <= endTime,
"Invalid time for buying"
);
require(amount > 0, "Invalid sale amount");
require(amount + totalTokensSold <= token_amount[maxStepIndex], "Insufficient funds");
_;
}
modifier notBlacklisted() {
require(!blacklist[_msgSender()], "You are in blacklist");
_;
}
/**
* @dev Creates the contract
* @param _previousPresale - Address of previous presale
* @param _betaPresale - Address of beta presale
* @param _saleToken start - Address of Metacade token
* @param _aggregatorInterface - Address of Chainlink ETH/USD price feed
* @param _USDTInterface - Address of USDT token
* @param _token_amount - Array of prices for each presale step
* @param _token_price - Array of totalTokenSold limit for each step
* @param _startTime - Sale start time
* @param _endTime - Sale end time
*/
constructor(
address _previousPresale,
address _betaPresale,
address _saleToken,
address _aggregatorInterface,
address _USDTInterface,
uint256[9] memory _token_amount,
uint256[9] memory _token_price,
uint256 _startTime,
uint256 _endTime
) {
require(_aggregatorInterface != address(0), "Zero aggregator address");
require(_USDTInterface != address(0), "Zero USDT address");
require(_saleToken != address(0), "Zero sale token address");
require(
_endTime > _startTime,
"Invalid time"
);
previousPresale = IMetacadePresaleV1(_previousPresale);
betaPresale = IMetacadePresaleV1(_betaPresale);
saleToken = _saleToken;
aggregatorInterface = IAggregator(_aggregatorInterface);
USDTInterface = IERC20(_USDTInterface);
token_amount = _token_amount;
token_price = _token_price;
startTime = _startTime;
endTime = _endTime;
emit SaleTimeSet(_startTime, _endTime, block.timestamp);
}
/**
* @dev To synchronize totalTokensSold with previous presales and calculate current step
*/
function sync() external onlyOwner {
require(!isSynchronized, "Already synchronized");
totalTokensSold = previousPresale.totalTokensSold() + betaPresale.totalTokensSold();
currentStep = _getStepByTotalSoldAmount();
isSynchronized = true;
}
/**
* @dev To pause the presale
*/
function pause() external onlyOwner {
_pause();
}
/**
* @dev To unpause the presale
*/
function unpause() external onlyOwner {
_unpause();
}
/**
* @dev To update the sale times
* @param _startTime - New sales start time
* @param _endTime - New sales end time
*/
function changeSaleTimes(uint256 _startTime, uint256 _endTime)
external
onlyOwner
{
if (startTime != _startTime) startTime = _startTime;
if (endTime != _endTime) endTime = _endTime;
emit SaleTimeSet(
_startTime,
_endTime,
block.timestamp
);
}
/**
* @dev To set the claim
* @param _claimStart - claim start time
* @notice Function also makes sure that presale have enough sale token balance
*/
function configureClaim(
uint256 _claimStart
) external onlyOwner returns (bool) {
require(IERC20(saleToken).balanceOf(address(this)) >= totalTokensSold * 1e18, "Not enough balance");
claimStart = _claimStart;
return true;
}
/**
* @dev To add users to blacklist
* @param _users - Array of addresses to add in blacklist
*/
function addToBlacklist(address[] calldata _users) external onlyOwner {
uint256 usersAmount = _users.length;
uint256 i = 0;
while(i<usersAmount) blacklist[_users[i++]] = true;
}
/**
* @dev To remove users from blacklist
* @param _users - Array of addresses to remove from blacklist
*/
function removeFromBlacklist(address[] calldata _users) external onlyOwner {
uint256 usersAmount = _users.length;
uint256 i = 0;
while(i<usersAmount) blacklist[_users[i++]] = false;
}
/**
* @dev Returns price for current step
*/
function getCurrentPrice() external view returns (uint256) {
return token_price[currentStep];
}
/**
* @dev Returns amount of tokens sold on current step
*/
function getSoldOnCurrentStage() external view returns (uint256 soldOnCurrentStage) {
soldOnCurrentStage = totalTokensSold - ((currentStep == 0)? 0 : token_amount[currentStep-1]);
}
/**
* @dev Returns presale last stage token amount limit
*/
function getTotalPresaleAmount() external view returns (uint256) {
return token_amount[maxStepIndex];
}
/**
* @dev Returns total price of sold tokens
* @notice Value may be inaccurate, since not all tokens were sold on the beta presale
*/
function totalSoldPrice() external view returns (uint256) {
return _calculateInternalCost(totalTokensSold, 0 ,0);
}
/**
* @dev Returns total price of sold tokens
* @param _tokenAddress - Address of token to resque
* @param _amount - Amount of tokens to resque
*/
function resqueERC20(address _tokenAddress, uint256 _amount) external onlyOwner {
IERC20(_tokenAddress).safeTransfer(_msgSender(), _amount);
}
/**
* @dev Returns tokens purchased by the user
* @param _user - Address of user
* @notice Takes into account the number of tokens purchased by the user on the previous presale and beta presale
*/
function userDeposits(address _user) public view returns(uint256) {
if (hasClaimed[_user]) return 0;
return _userDeposits[_user] + previousPresale.userDeposits(_user) + betaPresale.userDeposits(_user);
}
/**
* @dev To buy into a presale using ETH
* @param _amount - Amount of tokens to buy
*/
function buyWithEth(uint256 _amount) external payable checkSaleState(_amount) notBlacklisted whenNotPaused nonReentrant returns (bool) {
uint256 ethAmount = ethBuyHelper(_amount);
require(msg.value >= ethAmount, "Less payment");
_sendValue(payable(owner()), ethAmount);
uint256 excess = msg.value - ethAmount;
if (excess > 0) _sendValue(payable(_msgSender()), excess);
totalTokensSold += _amount;
_userDeposits[_msgSender()] += _amount * 1e18;
uint8 stepAfterPurchase = _getStepByTotalSoldAmount();
if (stepAfterPurchase>currentStep) currentStep = stepAfterPurchase;
emit TokensBought(
_msgSender(),
_amount,
ethAmount,
block.timestamp
);
return true;
}
/**
* @dev To buy into a presale using USDT
* @param _amount - Amount of tokens to buy
*/
function buyWithUSDT(uint256 _amount) external checkSaleState(_amount) notBlacklisted whenNotPaused nonReentrant returns (bool) {
uint256 usdtPrice = usdtBuyHelper(_amount);
require(usdtPrice <= USDTInterface.allowance(
_msgSender(),
address(this)
), "Not enough allowance");
USDTInterface.safeTransferFrom(
_msgSender(),
owner(),
usdtPrice
);
totalTokensSold += _amount;
_userDeposits[_msgSender()] += _amount * 1e18;
uint8 stepAfterPurchase = _getStepByTotalSoldAmount();
if (stepAfterPurchase>currentStep) currentStep = stepAfterPurchase;
emit TokensBought(
_msgSender(),
_amount,
usdtPrice,
block.timestamp
);
return true;
}
/**
* @dev To claim tokens after claiming starts
*/
function claim() external whenNotPaused nonReentrant {
require(block.timestamp >= claimStart && claimStart > 0, "Claim has not started yet");
require(!hasClaimed[_msgSender()], "Already claimed");
uint256 amount = userDeposits(_msgSender());
require(amount > 0, "Nothing to claim");
hasClaimed[_msgSender()] = true;
IERC20(saleToken).safeTransfer(_msgSender(), amount);
emit TokensClaimed(_msgSender(), amount, block.timestamp);
}
/**
* @dev To get latest ETH/USD price
* @notice Return result in 1e18 format
*/
function getLatestPrice() public view returns (uint256) {
(, int256 price, , ,) = aggregatorInterface.latestRoundData();
return uint256(price * 1e10);
}
/**
* @dev Calculate ETH price for given amount
* @param _amount - Amount of tokens to calculate price
* @notice Return result in 1e18 format
*/
function ethBuyHelper(uint256 _amount) public view returns (uint256 ethAmount) {
ethAmount = calculatePrice(_amount) * 1e18 / getLatestPrice();
}
/**
* @dev Calculate USDT price for given amount
* @param _amount - Amount of tokens to calculate price
* @notice Return result in 1e6 format
*/
function usdtBuyHelper(uint256 _amount) public view returns (uint256 usdtPrice) {
usdtPrice = calculatePrice(_amount) / 1e12;
}
/**
* @dev To calculate the price in USD for given amount of tokens
* @param _amount - Amount of tokens to calculate price
* @notice Return result in 1e18 format
*/
function calculatePrice(uint256 _amount) public view returns (uint256) {
require(_amount + totalTokensSold <= token_amount[maxStepIndex], "Insufficient token amount.");
return _calculateInternalCost(_amount, currentStep, totalTokensSold);
}
/**
* @dev For sending ETH from contract
* @param _recipient - Recipient address
* @param _weiAmount - Amount of ETH to send in wei
*/
function _sendValue(address payable _recipient, uint256 _weiAmount) internal {
require(address(this).balance >= _weiAmount, "Low balance");
(bool success,) = _recipient.call{value : _weiAmount}("");
require(success, "ETH Payment failed");
}
/**
* @dev Recursively calculate cost for specified conditions
* @param _amount - Amount of tokens to calculate price
* @param _currentStep - Starting step to calculate price
* @param _totalTokensSold - Starting total token sold amount to calculate price
*/
function _calculateInternalCost(uint256 _amount, uint256 _currentStep, uint256 _totalTokensSold) internal view returns (uint256 cost){
uint256 currentPrice = token_price[_currentStep];
uint256 currentAmount = token_amount[_currentStep];
if (_totalTokensSold + _amount <= currentAmount) {
cost = _amount * currentPrice;
}
else {
uint256 currentStageAmount = currentAmount - _totalTokensSold;
uint256 nextStageAmount = _amount - currentStageAmount;
cost = currentStageAmount * currentPrice + _calculateInternalCost(nextStageAmount, _currentStep + 1, currentAmount);
}
return cost;
}
/**
* @dev Calculate current step amount from total tokens sold amount
*/
function _getStepByTotalSoldAmount() internal view returns (uint8) {
uint8 stepIndex = maxStepIndex;
while (stepIndex > 0) {
if (token_amount[stepIndex - 1] < totalTokensSold) break;
stepIndex -= 1;
}
return stepIndex;
}
}