Contract Name:
BigChungusSale
Contract Source Code:
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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/// @title $CHUNGUS Sale
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)
/**
* @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);
}
/**
* @dev Interface for the optional metadata functions from the ERC-20 standard.
*/
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);
}
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/utils/SafeERC20.sol)
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Permit.sol)
/**
* @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);
}
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol)
/**
* @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
*
* Furthermore, `isContract` will also return true if the target contract within
* the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
* which only has an effect at the end of a transaction.
* ====
*
* [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://consensys.net/diligence/blog/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/v0.8.0/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);
}
}
}
/**
* @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;
/**
* @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
* non-reverting calls are assumed to be successful.
*/
function safeTransfer(IERC20 token, address to, uint256 value) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
}
/**
* @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
* calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
*/
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));
}
/**
* @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
* non-reverting calls are assumed to be successful.
*/
function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 oldAllowance = token.allowance(address(this), spender);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
}
/**
* @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
* non-reverting calls are assumed to be successful.
*/
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");
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
}
}
/**
* @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
* non-reverting calls are assumed to be successful. Compatible with tokens that require the approval to be set to
* 0 before setting it to a non-zero value.
*/
function forceApprove(IERC20 token, address spender, uint256 value) internal {
bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);
if (!_callOptionalReturnBool(token, approvalCall)) {
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
_callOptionalReturn(token, approvalCall);
}
}
/**
* @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
* Revert on invalid signature.
*/
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");
require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation 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).
*
* This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
*/
function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
// 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 cannot use {Address-functionCall} here since this should return false
// and not revert is the subcall reverts.
(bool success, bytes memory returndata) = address(token).call(data);
return
success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token));
}
}
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
/**
* @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;
}
}
/**
* @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. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby disabling 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);
}
}
// OpenZeppelin Contracts (last updated v4.8.0) (security/ReentrancyGuard.sol)
/**
* @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;
}
/**
* @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
* `nonReentrant` function in the call stack.
*/
function _reentrancyGuardEntered() internal view returns (bool) {
return _status == _ENTERED;
}
}
interface AggregatorV3Interface {
function decimals()
external
view
returns (
uint8
);
function description()
external
view
returns (
string memory
);
function version()
external
view
returns (
uint256
);
// getRoundData and latestRoundData should both raise "No data present"
// if they do not have data to report, instead of returning unset values
// which could be misinterpreted as actual reported values.
function getRoundData(
uint80 _roundId
)
external
view
returns (
uint80 roundId,
int256 answer,
uint256 startedAt,
uint256 updatedAt,
uint80 answeredInRound
);
function latestRoundData()
external
view
returns (
uint80 roundId,
int256 answer,
uint256 startedAt,
uint256 updatedAt,
uint80 answeredInRound
);
}
// OpenZeppelin Contracts v4.4.1 (utils/cryptography/MerkleProof.sol)
pragma solidity ^0.8.0;
/**
* @dev These functions deal with verification of Merkle Trees proofs.
*
* The proofs can be generated using the JavaScript library
* https://github.com/miguelmota/merkletreejs[merkletreejs].
* Note: the hashing algorithm should be keccak256 and pair sorting should be enabled.
*
* See `test/utils/cryptography/MerkleProof.test.js` for some examples.
*/
library MerkleProof {
/**
* @dev Returns true if a `leaf` can be proved to be a part of a Merkle tree
* defined by `root`. For this, a `proof` must be provided, containing
* sibling hashes on the branch from the leaf to the root of the tree. Each
* pair of leaves and each pair of pre-images are assumed to be sorted.
*/
function verify(
bytes32[] memory proof,
bytes32 root,
bytes32 leaf
) internal pure returns (bool) {
return processProof(proof, leaf) == root;
}
/**
* @dev Returns the rebuilt hash obtained by traversing a Merklee tree up
* from `leaf` using `proof`. A `proof` is valid if and only if the rebuilt
* hash matches the root of the tree. When processing the proof, the pairs
* of leafs & pre-images are assumed to be sorted.
*
* _Available since v4.4._
*/
function processProof(bytes32[] memory proof, bytes32 leaf) internal pure returns (bytes32) {
bytes32 computedHash = leaf;
for (uint256 i = 0; i < proof.length; i++) {
bytes32 proofElement = proof[i];
if (computedHash <= proofElement) {
// Hash(current computed hash + current element of the proof)
computedHash = keccak256(abi.encodePacked(computedHash, proofElement));
} else {
// Hash(current element of the proof + current computed hash)
computedHash = keccak256(abi.encodePacked(proofElement, computedHash));
}
}
return computedHash;
}
}
contract BigChungusSale is Ownable, ReentrancyGuard {
using SafeERC20 for IERC20;
using Address for address payable;
IERC20 public tokenContract; // token contract
enum ContractState {
OFF,
SEED,
FARMERS,
PUBLIC,
CLAIM
}
ContractState public contractState = ContractState.OFF;
mapping(uint256 => uint256) public totalTokensBought;
uint256 public totalTokensSeed = 1500000000 * 10 ** 18;
uint256 public totalTokensFarmers= 2999999999 * 10 ** 18;
uint256 public totalTokensPublic = 1000000000 * 10 ** 18;
mapping(address => mapping(uint256 => uint256)) public tokensBought; // tokensBought[address] = number of tokens bought by address
mapping(address => uint256) public claimedTokens; // claimedTokens[address] = number of tokens claimed by address
uint256 public tokenPrice = 100000000 ether; //USD price has 8 decimals (5$ = 500000000), we also need to add ether (18 decimals)
AggregatorV3Interface public priceFeed;
// Supported payment methods
mapping(address => bool) public supportedPaymentMethods;
bytes32 public merkleRootSeed;
bytes32 public merkleRootFarmers;
uint256 public seedTGE = 20;
uint256 public farmersTGE = 25;
uint256 public publicTGE = 30;
uint256 public vestingDurationSeed = 8 weeks; // Total duration of vesting
uint256 public vestingDurationFarmers = 7 weeks;
uint256 public vestingDurationPublic = 6 weeks;
uint256 public claimStartTimestamp;
// Define min and max buy amounts as global variables
uint256 public minBuyAmount;
uint256 public maxBuyAmount;
address public treasury;
// Events
event TokensBought(address indexed buyer, address indexed paymentToken, uint256 numberOfTokens);
event TokensClaimed(address indexed claimer, uint256 numberOfTokens);
constructor() {
// tokenContract = ;
// treasury = ;
// supportedPaymentMethods[] = true; // USDT
// supportedPaymentMethods[] = true; // USDC
}
/**
* Ensure current state is correct for this method.
*/
modifier isContractState(ContractState contractState_) {
require(contractState == contractState_, "Invalid state");
_;
}
// Modifiers to check if the mint amount is within the allowed range for each stage
// modifier withinLimit(uint256 numberOfTokens) {
// if (contractState == ContractState.SEED) {
// require(totalTokensBought + numberOfTokens <= totalTokensSeed, "Exceeds Seed stage limit");
// }
// else if (contractState == ContractState.FARMERS) {
// require(totalTokensBought + numberOfTokens <= totalTokensFarmers, "Exceeds Seed stage limit");
// }
// else {
// require(totalTokensBought + numberOfTokens <= totalTokensPublic, "Exceeds Seed stage limit");
// }
// _;
// }
/**
*
* @notice Throws if called when presale is not active
* @param paymentToken the method of payment
* @param numberOfTokens the number of tokens to buy
*/
function buyTokensSeed(uint256 numberOfTokens, address paymentToken, bytes32[] calldata proof) external payable nonReentrant isContractState(ContractState.SEED) {
require((tokensBought[msg.sender][1] + numberOfTokens) >= minBuyAmount && (tokensBought[msg.sender][1] + numberOfTokens) <= maxBuyAmount, "Purchase amount outside allowed range");
/// Check if user is on the allow list
bytes32 leaf = keccak256(abi.encodePacked(_msgSender()));
// Check the merkle proof
require(MerkleProof.verify(proof, merkleRootSeed, leaf), "Invalid proof");
if (numberOfTokens + totalTokensBought[1] > totalTokensSeed) {
numberOfTokens = totalTokensSeed - totalTokensBought[1];
}
if (msg.value > 0) {
require(address(paymentToken) == address(0), "Cannot Have Both ETH & ERC20 Payment Methodd!");
uint256 cost = getCost(paymentToken, numberOfTokens);
require(msg.value >= cost, "Insufficient Funds Sent!");
tokensBought[msg.sender][1] += numberOfTokens;
totalTokensBought[1] += numberOfTokens;
(bool sent, ) = payable(treasury).call{value: cost}("");
require(sent, "Failed To Send!");
uint256 remainder = msg.value - cost;
if (remainder > 0) {
(sent, ) = payable(msg.sender).call{value: remainder}("");
require(sent, "Failed To Refund Extra!");
}
} else {
uint256 cost = getCost(paymentToken, numberOfTokens);
require(IERC20(paymentToken).allowance(msg.sender, address(this)) >= cost, "Not Enough Allowance!");
tokensBought[msg.sender][1] += numberOfTokens;
totalTokensBought[1] += numberOfTokens;
IERC20(paymentToken).safeTransferFrom(msg.sender, treasury, cost);
}
// Emit event
emit TokensBought(
msg.sender,
paymentToken,
numberOfTokens
);
}
/**
*
* @notice Throws if called when presale is not active
* @param paymentToken the method of payment
* @param numberOfTokens the number of tokens to buy
*/
function buyTokensFarmers(uint256 numberOfTokens, address paymentToken, bytes32[] calldata proof) external payable nonReentrant isContractState(ContractState.FARMERS) {
require((tokensBought[msg.sender][2] + numberOfTokens) >= minBuyAmount && (tokensBought[msg.sender][2] + numberOfTokens) <= maxBuyAmount, "Purchase amount outside allowed range");
/// Check if user is on the allow list
bytes32 leaf = keccak256(abi.encodePacked(_msgSender()));
// Check the merkle proof
require(MerkleProof.verify(proof, merkleRootFarmers, leaf), "Invalid proof");
if (numberOfTokens + totalTokensBought[2] > totalTokensFarmers) {
numberOfTokens = totalTokensFarmers - totalTokensBought[2];
}
if (msg.value > 0) {
require(address(paymentToken) == address(0), "Cannot Have Both ETH & ERC20 Payment Methodd!");
uint256 cost = getCost(paymentToken, numberOfTokens);
require(msg.value >= cost, "Insufficient Funds Sent!");
tokensBought[msg.sender][2] += numberOfTokens;
totalTokensBought[2] += numberOfTokens;
(bool sent, ) = payable(treasury).call{value: cost}("");
require(sent, "Failed To Send!");
uint256 remainder = msg.value - cost;
if (remainder > 0) {
(sent, ) = payable(msg.sender).call{value: remainder}("");
require(sent, "Failed To Refund Extra!");
}
} else {
uint256 cost = getCost(paymentToken, numberOfTokens);
require(IERC20(paymentToken).allowance(msg.sender, address(this)) >= cost, "Not Enough Allowance!");
tokensBought[msg.sender][2] += numberOfTokens;
totalTokensBought[2] += numberOfTokens;
IERC20(paymentToken).safeTransferFrom(msg.sender, treasury, cost);
}
// Emit event
emit TokensBought(
msg.sender,
paymentToken,
numberOfTokens
);
}
/**
*
* @notice Throws if called when presale is not active
* @param paymentToken the method of payment
* @param numberOfTokens the number of tokens to buy
*/
function buyTokensPublic(uint256 numberOfTokens, address paymentToken) external payable nonReentrant isContractState(ContractState.PUBLIC) {
require((tokensBought[msg.sender][3] + numberOfTokens) >= minBuyAmount && (tokensBought[msg.sender][3] + numberOfTokens) <= maxBuyAmount, "Purchase amount outside allowed range");
if (numberOfTokens + totalTokensBought[3] > totalTokensPublic) {
numberOfTokens = totalTokensPublic - totalTokensBought[3];
}
if (msg.value > 0) {
require(address(paymentToken) == address(0), "Cannot Have Both ETH & ERC20 Payment Methodd!");
uint256 cost = getCost(paymentToken, numberOfTokens);
require(msg.value >= cost, "Insufficient Funds Sent!");
tokensBought[msg.sender][3] += numberOfTokens;
totalTokensBought[3] += numberOfTokens;
(bool sent, ) = payable(treasury).call{value: cost}("");
require(sent, "Failed To Send!");
uint256 remainder = msg.value - cost;
if (remainder > 0) {
(sent, ) = payable(msg.sender).call{value: remainder}("");
require(sent, "Failed To Refund Extra!");
}
} else {
uint256 cost = getCost(paymentToken, numberOfTokens);
require(IERC20(paymentToken).allowance(msg.sender, address(this)) >= cost, "Not Enough Allowance!");
tokensBought[msg.sender][3] += numberOfTokens;
totalTokensBought[3] += numberOfTokens;
IERC20(paymentToken).safeTransferFrom(msg.sender, treasury, cost);
}
// Check if we exceeded total amount
if (totalTokensBought[3] == totalTokensPublic) {
contractState = ContractState.OFF;
}
// Emit event
emit TokensBought(
msg.sender,
paymentToken,
numberOfTokens
);
}
/**
* @notice Transfer the number of tokens that can currently be claimed by the user (if any)
*/
function claimTokens() external nonReentrant isContractState(ContractState.CLAIM) {
require(block.timestamp > claimStartTimestamp, "Vesting Has Not Started Yet");
uint256 tokensToClaim = calculateVestedTokens(msg.sender);
require(tokensToClaim > 0, "No Tokens available for claim yet");
claimedTokens[msg.sender] += tokensToClaim;
tokenContract.safeTransfer(msg.sender, tokensToClaim);
// Emit event
emit TokensClaimed(msg.sender, tokensToClaim);
}
/**
* @notice Calculates the amount of tokens that have vested for a user based on the global claimStartTimestamp.
* @param user The address of the user.
* @return The amount of vested tokens.
*/
function calculateVestedTokens(address user) public view returns (uint256) {
uint256 totalTokens;
uint256 vestedTokens;
for (uint i = 1; i < 4; i++) {
uint256 timeElapsed = block.timestamp - claimStartTimestamp;
if (i == 1) {
if (timeElapsed >= vestingDurationSeed) {
vestedTokens = tokensBought[user][i];
}
else {
vestedTokens = (tokensBought[user][i] * seedTGE / 100) + (((tokensBought[user][i] * (100 - seedTGE)) / 100) * timeElapsed) / vestingDurationSeed;
}
}
else if (i == 2) {
if (timeElapsed >= vestingDurationFarmers) {
vestedTokens = tokensBought[user][i];
}
else {
vestedTokens = (tokensBought[user][i] * farmersTGE / 100) + (((tokensBought[user][i] * (100 - farmersTGE)) / 100) * timeElapsed) / vestingDurationFarmers;
}
}
else {
if (timeElapsed >= vestingDurationPublic) {
vestedTokens = tokensBought[user][i];
}
else {
vestedTokens = (tokensBought[user][i] * publicTGE / 100) + (((tokensBought[user][i] * (100 - publicTGE)) / 100) * timeElapsed) / vestingDurationPublic;
}
}
totalTokens += vestedTokens;
}
return totalTokens - claimedTokens[user];
}
function getTokentoUSD() public view returns(int) {
(,int price,,,) = priceFeed.latestRoundData();
return price;
}
function getPriceEth() public view returns(uint256) {
int price = getTokentoUSD();
return tokenPrice / uint256(price);
}
/**
* Calculate the cost of buying a number of tokens
* @param paymentToken method of payment
* @param numberOfTokens number of tokens to buy
*/
function getCost(
address paymentToken,
uint256 numberOfTokens
) public view returns (uint256) {
uint256 cost;
if (paymentToken == address(0)) {
cost = (numberOfTokens * getPriceEth()) / 10 ** 18;
}
else {
require(supportedPaymentMethods[paymentToken], "Unsupported Payment Method!");
cost = (numberOfTokens * tokenPrice * 10 ** IERC20Metadata(paymentToken).decimals()) / 10 ** 44;
}
return cost;
}
/**
* @dev Function to retrieve the tokens avialable for purchase in a specific round
* @param _buyer Address of the buyer
* @param _round Active State (1 - SEED, 2 - FARMERS, 3 - PUBLIC)
* @dev Make sure to input the correct active state of the contract. You can queue it by calling contractState().
* Otherwise calculations within the function are irrelevant
*/
function getTokensAvailable(address _buyer, uint256 _round) public view returns(uint256) {
uint256 amount = maxBuyAmount - tokensBought[_buyer][_round];
return amount;
}
/**
* @notice Set price
* @param _tokenPrice token price
*/
function setTokenPrice(
uint256 _tokenPrice
) external onlyOwner {
tokenPrice = _tokenPrice;
}
/**
* @dev Sets the price feed contract address.
* Can only be called by the contract owner.
*
* @param _priceFeedAddress The address of the new price feed contract.
*/
function setPriceFeed(address _priceFeedAddress) external onlyOwner {
require(_priceFeedAddress != address(0), "Invalid address"); // Ensuring the provided address is not the zero address.
priceFeed = AggregatorV3Interface(_priceFeedAddress); // Setting the new price feed address.
}
/**
* @dev Sets the token contract address.
* Can only be called by the contract owner.
*
* @param _tokenContractAddress The address of the new token contract.
*/
function setTokenContract(address _tokenContractAddress) external onlyOwner {
require(_tokenContractAddress != address(0), "Invalid address"); // Ensuring the provided address is not the zero address.
tokenContract = IERC20(_tokenContractAddress); // Setting the new token contract address.
}
/**
* @dev Sets the treasury address.
* Can only be called by the contract owner.
*
* @param _treasuryAddress The address of the new treasury.
*/
function setTreasury(address _treasuryAddress) external onlyOwner {
require(_treasuryAddress != address(0), "Invalid address"); // Ensuring the provided address is not the zero address.
treasury = _treasuryAddress; // Setting the new treasury address.
}
/**
* @dev Sets the TGE percentage for Seed stage.
* Can only be called when claimStartTimestamp is 0 and by the contract owner.
*
* @param _seedTGE The new TGE percentage for Seed stage.
*/
function setSeedTGE(uint256 _seedTGE) external onlyOwner {
require(claimStartTimestamp == 0, "Cannot change TGE after claims have started");
require(_seedTGE <= 100, "TGE percentage cannot exceed 100");
seedTGE = _seedTGE;
}
/**
* @dev Sets the TGE percentage for Farmers stage.
* Can only be called when claimStartTimestamp is 0 and by the contract owner.
*
* @param _farmersTGE The new TGE percentage for Farmers stage.
*/
function setFarmersTGE(uint256 _farmersTGE) external onlyOwner {
require(claimStartTimestamp == 0, "Cannot change TGE after claims have started");
require(_farmersTGE <= 100, "TGE percentage cannot exceed 100");
farmersTGE = _farmersTGE;
}
/**
* @dev Sets the TGE percentage for Public stage.
* Can only be called when claimStartTimestamp is 0 and by the contract owner.
*
* @param _publicTGE The new TGE percentage for Public stage.
*/
function setPublicTGE(uint256 _publicTGE) external onlyOwner {
require(claimStartTimestamp == 0, "Cannot change TGE after claims have started");
require(_publicTGE <= 100, "TGE percentage cannot exceed 100");
publicTGE = _publicTGE;
}
/**
* @dev Sets the vesting duration for the Seed stage.
* Can only be called by the contract owner before claiming starts.
*
* @param _duration The new vesting duration for the Seed stage in seconds.
*/
function setVestingDurationSeed(uint256 _duration) external onlyOwner {
require(claimStartTimestamp == 0, "Cannot change duration after claims have started");
vestingDurationSeed = _duration;
}
/**
* @dev Sets the vesting duration for the Farmers stage.
* Can only be called by the contract owner before claiming starts.
*
* @param _duration The new vesting duration for the Farmers stage in seconds.
*/
function setVestingDurationFarmers(uint256 _duration) external onlyOwner {
require(claimStartTimestamp == 0, "Cannot change duration after claims have started");
vestingDurationFarmers = _duration;
}
/**
* @dev Sets the vesting duration for the Public stage.
* Can only be called by the contract owner before claiming starts.
*
* @param _duration The new vesting duration for the Public stage in seconds.
*/
function setVestingDurationPublic(uint256 _duration) external onlyOwner {
require(claimStartTimestamp == 0, "Cannot change duration after claims have started");
vestingDurationPublic = _duration;
}
/**
* @dev Sets the minimum buy amount.
* Can only be called by the contract owner.
*
* @param _minBuyAmount The new minimum buy amount.
*/
function setMinBuyAmount(uint256 _minBuyAmount) external onlyOwner {
require(_minBuyAmount <= maxBuyAmount, "Min buy amount cannot exceed max buy amount");
minBuyAmount = _minBuyAmount;
}
/**
* @dev Sets the maximum buy amount.
* Can only be called by the contract owner.
*
* @param _maxBuyAmount The new maximum buy amount.
*/
function setMaxBuyAmount(uint256 _maxBuyAmount) external onlyOwner {
require(_maxBuyAmount >= minBuyAmount, "Max buy amount cannot be less than min buy amount");
maxBuyAmount = _maxBuyAmount;
}
/**
* @dev Sets the contract's operational state.
* @param newState The new state to set the contract to
*/
function setContractState(uint256 newState) external onlyOwner {
require(newState < 5, "Invalid state.");
contractState = ContractState(newState);
if (newState == 4) {
claimStartTimestamp = block.timestamp;
}
}
/**
* @dev Sets the Token Seed amount
*/
function setTokensSeed(uint256 _amount) external onlyOwner {
totalTokensSeed = _amount;
}
/**
* @dev Sets the TokensFarmers amount
*/
function setTokensFarmers(uint256 _amount) external onlyOwner {
totalTokensFarmers = _amount;
}
/**
* @dev Sets the TokensPublic amount
*/
function setTokensPublic(uint256 _amount) external onlyOwner {
totalTokensPublic = _amount;
}
/**
* @param merkleRoot_ The new merkle root
*/
function setMerkleRootSeed(bytes32 merkleRoot_) external onlyOwner {
merkleRootSeed = merkleRoot_;
}
/**
* @param merkleRoot_ The new merkle root
*/
function setMerkleRootFarmers(bytes32 merkleRoot_) external onlyOwner {
merkleRootFarmers = merkleRoot_;
}
/**
* @notice Set a price feed for a given payment method
* @param paymentToken IERC20 token to set price feed for
*/
function setPaymentMethod(address paymentToken) external onlyOwner {
require(paymentToken != address(0), "Invalid Address!");
supportedPaymentMethods[paymentToken] = true;
}
/**
* @notice Transfer ownership of the contract to a new owner after the presale ends
* @param newOwner new owner of the contract
*/
function transferOwnership(address newOwner) public override onlyOwner {
Ownable.transferOwnership(newOwner);
}
/**
* Revert any funds sent to the contract directly
*/
receive() external payable {
revert();
}
}