Delirium Token and Farm Smart Contract

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Sandman Farm MasterChefV2 contract Token contract
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Verified by Jaimy de Vries
Polygon Smart Contract Audit Report
MD5:849as3odd52344918d41co1791qt7ca139

Overal Score  100% 
Score
100
Threat Level
Low

Audit Report

  1. DELIRIUM MASTERCHEF
  2. DELIRIUM TOKEN
  3. DELIRIUM TIMELOCK

Table of Contents

Overview

Project summary
Audit summary
Risk summary

Findings

Findings summary

Explanation

Introduction

This interim report has been prepared for the Delirium Token, Delirium Masterchef and Delirium Timelock smart contracts. The purpose of this report is to provide insights with the aim of optimizing current smart contracts. Due to the overlap in code, it was decided to reduce the interim report to 1 summary document. The procedure for arriving at the following conclusions is made up of the following:

  • Testing the code against known and rare attack patterns
  • Assessing the layout of the various code components to test best practice
  • Scanning and stress testing of the contract functions, including low-level calls and edge cases. Cross
  • Thorough line-by-line inspection by certified Solidity Developer.

The investigation resulted in a number of minimal findings, with mainly informative considerations. The “Findings” section contains an overview of the findings and associated recommendations or additional information. In a separate file are the explanations of the function calls, inheritance and call-graph in .DOT format.

Overview

Project summary

Contract Names

Delirium Token | Delirium Masterchef | Delirium TimeLock

Network                                     Polygon

Language                                   Solidity

Codebase                polygonscan.com/address/0xd3976E92a48821DD1122Ae5e8265b14595aF34d2

Audit summary

Delivery date

10-09-2021

Audit Methodology                         Static Analysis, Manual Analysis

Risk summary

Risk Level

Total

Reported

         Disproved

Solved

     Recognized

Objection

Critical

0

0

0

0

0

0

Major

0

0

0

0

0

0

Medium

0

0

0

0

0

0

Minor

4

0

0

0

0

0

Informative

14

0

0

0

0

0

Discussion

1

0

0

0

0

0

Findings 

Category

Public functions that can be declared External.

Status

Risk Level           Amount

Gas Optimization            Informative          15                                                                              Reported

Category

 

Low-Level Calls.

Status

Risk Level            Amount

Sensitive to errors          Minor                  4                                                                               Reported

Category

 

Static variable that can be made constant.

Status

Risk Level           Amount

Gas Optimization            Informative          1                                                                               Reported

Category

 

Equation with constant Boolean

Status

Risk Level           Amount

Gas Optimization            Informative          1                                                                               Reported

Unused return value.

Status

Risk Level           Amount

Lost Computation           Discussion            1                                                                               Reported

Findings summary

Public functions that can be declared External (Master Chef)

renounceOwnership() Could be declared as external:

        - Ownable.renounceOwnership() (masterchef.sol#72-74)

transferOwnership(address) Could be declared as external:

        - Ownable.transferOwnership(address) (masterchef.sol#80-83)

name() Could be declared as external:

        - ERC20.name() (masterchef.sol#604-606)

symbol() Could be declared as external:

        - ERC20.symbol() (masterchef.sol#612-614)

decimals() Could be declared as external:

        - ERC20.decimals() (masterchef.sol#629-631)

totalSupply() Could be declared as external:

        - ERC20.totalSupply() (masterchef.sol#636-638)

balanceOf(address) Could be declared as external:

        - ERC20.balanceOf(address) (masterchef.sol#643-645)

transfer(address,uint256) Could be declared as external:

        - ERC20.transfer(address,uint256) (masterchef.sol#655-658)

allowance(address,address) Could be declared as external:

        - ERC20.allowance(address,address) (masterchef.sol#663-665)

approve(address,uint256) Could be declared as external:

        - ERC20.approve(address,uint256) (masterchef.sol#674-677)

transferFrom(address,address,uint256) Could be declared as external:

        - ERC20.transferFrom(address,address,uint256) (masterchef.sol#692-706)

increaseAllowance(address,uint256) Could be declared as external:

        - ERC20.increaseAllowance(address,uint256) (masterchef.sol#720-723)

decreaseAllowance(address,uint256) Could be declared as external:

        - ERC20.decreaseAllowance(address,uint256) (masterchef.sol#739-747)

mint(address,uint256) Could be declared as external:

        - DeliriumToken.mint(address,uint256) (masterchef.sol#908-910)

setEmissionRate(uint256) Could be declared as external:

        - MasterChefV2.setEmissionRate(uint256) (masterchef.sol#1203-1210)

Public functions that can be declared External (Token)

renounceOwnership() can be written as external:

        - Ownable.renounceOwnership() (tokensingle.sol#72-74)

transferOwnership(address) can be written as external:

        - Ownable.transferOwnership(address) (tokensingle.sol#80-83)

name() can be written as external:

        - ERC20.name() (tokensingle.sol#247-249)

symbol() can be written as external:

        - ERC20.symbol() (tokensingle.sol#255-257)

decimals() can be written as external:

        - ERC20.decimals() (tokensingle.sol#272-274)

totalSupply() can be written as external:

        - ERC20.totalSupply() (tokensingle.sol#279-281)

balanceOf(address) can be written as external:

        - ERC20.balanceOf(address) (tokensingle.sol#286-288)

transfer(address,uint256) can be written as external:

        - ERC20.transfer(address,uint256) (tokensingle.sol#298-301)

allowance(address,address) can be written as external:

        - ERC20.allowance(address,address) (tokensingle.sol#306-308)

approve(address,uint256) can be written as external:

        - ERC20.approve(address,uint256) (tokensingle.sol#317-320)

transferFrom(address,address,uint256) can be written as external:

        - ERC20.transferFrom(address,address,uint256) (tokensingle.sol#335-349)

increaseAllowance(address,uint256) can be written as external:

        - ERC20.increaseAllowance(address,uint256) (tokensingle.sol#363-366)

decreaseAllowance(address,uint256) can be written as external:

        - ERC20.decreaseAllowance(address,uint256) (tokensingle.sol#382-390)

mint(address,uint256) can be written as external:

Low-level calls

Low level call in Address.sendValue(address,uint256) (chef.sol#142-147):

        - (success) = recipient.call{value: amount}() (chef.sol#145)

Low level call in Address.functionCallWithValue(address,bytes,uint256,string) (chef.sol#210-221):

        - (success,returndata) = target.call{value: value}(data) (chef.sol#219)

Low level call in Address.functionStaticCall(address,bytes,string) (chef.sol#239-248):

        - (success,returndata) = target.staticcall(data) (chef.sol#246)

Low level call in Address.functionDelegateCall(address,bytes,string) (chef.sol#266-275):

        - (success,returndata) = target.delegatecall(data) (chef.sol#273)

Reduce gas by defining state variable as constant

MasterChefV2.deliriumMaximumSupply (chef.sol#950) can be written as a constant.

Comparison with Boolean

MasterChefV2.nonDuplicated(IERC20) (chef.sol#999-1002) makes a comparison with a Boolean value:

        -require(bool,string)(poolExistence[_lpToken] == false,nonDuplicated: duplicated) (chef.sol#1000)

Ignored Return Value
  MasterChefV2.add(uint256,IERC20,uint16,bool) (chef.sol#1005-1027) ignores the return value of  _lpToken.balanceOf(address(this)) (chef.sol#1007)

 

Audit Disclaimer

BSCN Audits (“BSCN Audits”) has conducted an independent audit to verify the integrity

of and highlight any vulnerabilities or errors, intentional or unintentional, that may be present in the codes that were provided for the scope of this audit.

This audit report does not constitute agreement, acceptance or advocation for the Project that was audited, and users relying on this audit report should not consider this as having any merit for financial advice in any shape, form or nature. The contracts audited do not account for any economic developments that may be pursued by the Project in question, and that the veracity of the findings thus presented in this report relate solely to the proficiency, competence, aptitude and discretion of our independent auditors, who make no guarantees nor assurance that the contracts are completely free of exploits, bugs, vulnerabilities or deprecation of technologies.

Further, this audit report shall not be disclosed nor transmitted to any persons or parties on any objective, goal or justification without due written assent, acquiescence or approval by BSCN Audits.

All information provided in this report does not constitute financial or investment advice, nor should it be used to signal that any persons reading this report should invest their funds without sufficient individual due diligence regardless of the findings presented in this report. Information is provided ‘as is’, and BSCN Audits is under no covenant to the completeness, accuracy or solidity of the
contracts audited. In no event will BSCN Audits or its partners, employees, agents or parties related to the provision of this audit report be liable to any parties for, or lack thereof, decisions and/or actions with regards to the information provided in this audit report. Cryptocurrencies and any technologies by extension directly or indirectly related to cryptocurrencies are highly volatile and speculative by nature. All reasonable due diligence and safeguards may yet be insufficient, and users should exercise considerable caution when participating in any shape or form in this nascent industry.

The audit report has made all reasonable attempts to provide clear and articulate recommendations to the Project team with respect to the rectification, amendment and/or revision of any highlighted issues, vulnerabilities or exploits within the contracts provided. It is the sole responsibility of the Project team to sufficiently test and perform checks, ensuring that the contracts are functioning as intended, specifically that the functions therein contained within said contracts have the desired intended effects, functionalities and outcomes of the Project team.

Contract Analysis

  • Verified contract source
  • Source does not contain a proxy contract
  • Source does not contain a pausable contract
  • No prior similar token contracts
    There are highly similar contracts that were deployed prior to this one. Cloned contracts may indicate a low quality token (e.g., pump & dump) unless there exists an offering other than the token itself.

Disclaimer

Note: the BSCN Token Snif Report is based on the Token Sniffer Tests which are an experimental new feature and may not be 100% accurate or detect all possible vulnerabilities. The results are not to be interpreted as advice and should be considered in the context of the project as a whole along with external information. Always do your own research and consult multiple sources of information. Under no circumstances will BSCN be responsible for any misinformation that is stated in the Token Snif Extract Report.

Contracts Scanned: SafeSwap Token, SafeswapToken, BEP20, Ownable, Context

BSCN Audits (“BSCN Audits”) has conducted an independent audit to verify the integrity

of and highlight any vulnerabilities or errors, intentional or unintentional, that may be present in the codes that were provided for the scope of this audit.

This audit report does not constitute agreement, acceptance or advocation for the Project that was audited, and users relying on this audit report should not consider this as having any merit for financial advice in any shape, form or nature. The contracts audited do not account for any economic developments that may be pursued by the Project in question, and that the veracity of the findings thus presented in this report relate solely to the proficiency, competence, aptitude and discretion of our independent auditors, who make no guarantees nor assurance that the contracts are completely free of exploits, bugs, vulnerabilities or deprecation of technologies.

Further, this audit report shall not be disclosed nor transmitted to any persons or parties on any objective, goal or justification without due written assent, acquiescence or approval by BSCN Audits.

All information provided in this report does not constitute financial or investment advice, nor should it be used to signal that any persons reading this report should invest their funds without sufficient individual due diligence regardless of the findings presented in this report. Information is provided ‘as is’, and BSCN Audits is under no covenant to the completeness, accuracy or solidity of the
contracts audited. In no event will BSCN Audits or its partners, employees, agents or parties related to the provision of this audit report be liable to any parties for, or lack thereof, decisions and/or actions with regards to the information provided in this audit report. Cryptocurrencies and any technologies by extension directly or indirectly related to cryptocurrencies are highly volatile and speculative by nature. All reasonable due diligence and safeguards may yet be insufficient, and users should exercise considerable caution when participating in any shape or form in this nascent industry.

The audit report has made all reasonable attempts to provide clear and articulate recommendations to the Project team with respect to the rectification, amendment and/or revision of any highlighted issues, vulnerabilities or exploits within the contracts provided. It is the sole responsibility of the Project team to sufficiently test and perform checks, ensuring that the contracts are functioning as intended, specifically that the functions therein contained within said contracts have the desired intended effects, functionalities and outcomes of the Project team.

Delirium Token Smart contract

File 1 of 6 : DeliriumToken.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.4;

import “@openzeppelin/contracts/token/ERC20/ERC20.sol”;
import “@openzeppelin/contracts/access/Ownable.sol”;

// DeliriumToken
contract DeliriumToken is ERC20, Ownable {

constructor()
ERC20(‘DELIRIUM’, ‘DELIRIUM’)
{}

/// @notice Creates `_amount` token to `_to`. Must only be called by the owner (MasterChef).
function mint(address _to, uint256 _amount) public onlyOwner {
_mint(_to, _amount);
}
}

File 6 of 10 : Address.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
* @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;
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.
*
* eips.ethereum.org/EIPS/eip-1884%5BEIP1884%5D 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.
*
* diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/%5BLearn more].
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* {ReentrancyGuard} or the
* solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern%5Bchecks-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 solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions%5B`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”);

(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”);

(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 v3.4._
*/
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) {
require(isContract(target), “Address: delegate call to non-contract”);

(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

assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}

File 2 of 6 : ERC20.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import “./IERC20.sol”;
import “./extensions/IERC20Metadata.sol”;
import “../../utils/Context.sol”;

/**
* @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
* forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226%5BHow
* 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, IERC20Metadata {
mapping(address => uint256) private _balances;

mapping(address => mapping(address => uint256)) private _allowances;

uint256 private _totalSupply;

string private _name;
string private _symbol;

/**
* @dev Sets the values for {name} and {symbol}.
*
* The default value of {decimals} is 18. To select a different value for
* {decimals} you should overload it.
*
* All two of these values are immutable: they can only be set once during
* construction.
*/
constructor(string memory name_, string memory symbol_) {
_name = name_;
_symbol = symbol_;
}

/**
* @dev Returns the name of the token.
*/
function name() public view virtual override returns (string memory) {
return _name;
}

/**
* @dev Returns the symbol of the token, usually a shorter version of the
* name.
*/
function symbol() public view virtual override returns (string memory) {
return _symbol;
}

/**
* @dev Returns the number of decimals used to get its user representation.
* For example, if `decimals` equals `2`, a balance of `505` tokens should
* be displayed to a user as `5,05` (`505 / 10 ** 2`).
*
* Tokens usually opt for a value of 18, imitating the relationship between
* Ether and Wei. This is the value {ERC20} uses, unless this function is
* overridden;
*
* NOTE: This information is only used for _display_ purposes: it in
* no way affects any of the arithmetic of the contract, including
* {IERC20-balanceOf} and {IERC20-transfer}.
*/
function decimals() public view virtual override returns (uint8) {
return 18;
}

/**
* @dev See {IERC20-totalSupply}.
*/
function totalSupply() public view virtual override returns (uint256) {
return _totalSupply;
}

/**
* @dev See {IERC20-balanceOf}.
*/
function balanceOf(address account) public view virtual override returns (uint256) {
return _balances[account];
}

/**
* @dev See {IERC20-transfer}.
*
* Requirements:
*
* – `recipient` cannot be the zero address.
* – the caller must have a balance of at least `amount`.
*/
function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
_transfer(_msgSender(), recipient, amount);
return true;
}

/**
* @dev See {IERC20-allowance}.
*/
function allowance(address owner, address spender) public view virtual override returns (uint256) {
return _allowances[owner][spender];
}

/**
* @dev See {IERC20-approve}.
*
* Requirements:
*
* – `spender` cannot be the zero address.
*/
function approve(address spender, uint256 amount) public virtual override returns (bool) {
_approve(_msgSender(), spender, amount);
return true;
}

/**
* @dev See {IERC20-transferFrom}.
*
* Emits an {Approval} event indicating the updated allowance. This is not
* required by the EIP. See the note at the beginning of {ERC20}.
*
* Requirements:
*
* – `sender` and `recipient` cannot be the zero address.
* – `sender` must have a balance of at least `amount`.
* – the caller must have allowance for “sender“’s tokens of at least
* `amount`.
*/
function transferFrom(
address sender,
address recipient,
uint256 amount
) public virtual override returns (bool) {
_transfer(sender, recipient, amount);

uint256 currentAllowance = _allowances[sender][_msgSender()];
require(currentAllowance >= amount, “ERC20: transfer amount exceeds allowance”);
unchecked {
_approve(sender, _msgSender(), currentAllowance – amount);
}

return true;
}

/**
* @dev Atomically increases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* – `spender` cannot be the zero address.
*/
function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
return true;
}

/**
* @dev Atomically decreases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* – `spender` cannot be the zero address.
* – `spender` must have allowance for the caller of at least
* `subtractedValue`.
*/
function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
uint256 currentAllowance = _allowances[_msgSender()][spender];
require(currentAllowance >= subtractedValue, “ERC20: decreased allowance below zero”);
unchecked {
_approve(_msgSender(), spender, currentAllowance – subtractedValue);
}

return true;
}

/**
* @dev Moves `amount` of tokens from `sender` to `recipient`.
*
* This internal function is equivalent to {transfer}, and can be used to
* e.g. implement automatic token fees, slashing mechanisms, etc.
*
* Emits a {Transfer} event.
*
* Requirements:
*
* – `sender` cannot be the zero address.
* – `recipient` cannot be the zero address.
* – `sender` must have a balance of at least `amount`.
*/
function _transfer(
address sender,
address recipient,
uint256 amount
) internal virtual {
require(sender != address(0), “ERC20: transfer from the zero address”);
require(recipient != address(0), “ERC20: transfer to the zero address”);

_beforeTokenTransfer(sender, recipient, amount);

uint256 senderBalance = _balances[sender];
require(senderBalance >= amount, “ERC20: transfer amount exceeds balance”);
unchecked {
_balances[sender] = senderBalance – amount;
}
_balances[recipient] += amount;

emit Transfer(sender, recipient, amount);

_afterTokenTransfer(sender, recipient, amount);
}

/** @dev Creates `amount` tokens and assigns them to `account`, increasing
* the total supply.
*
* Emits a {Transfer} event with `from` set to the zero address.
*
* Requirements:
*
* – `account` cannot be the zero address.
*/
function _mint(address account, uint256 amount) internal virtual {
require(account != address(0), “ERC20: mint to the zero address”);

_beforeTokenTransfer(address(0), account, amount);

_totalSupply += amount;
_balances[account] += amount;
emit Transfer(address(0), account, amount);

_afterTokenTransfer(address(0), account, amount);
}

/**
* @dev Destroys `amount` tokens from `account`, reducing the
* total supply.
*
* Emits a {Transfer} event with `to` set to the zero address.
*
* Requirements:
*
* – `account` cannot be the zero address.
* – `account` must have at least `amount` tokens.
*/
function _burn(address account, uint256 amount) internal virtual {
require(account != address(0), “ERC20: burn from the zero address”);

_beforeTokenTransfer(account, address(0), amount);

uint256 accountBalance = _balances[account];
require(accountBalance >= amount, “ERC20: burn amount exceeds balance”);
unchecked {
_balances[account] = accountBalance – amount;
}
_totalSupply -= amount;

emit Transfer(account, address(0), amount);

_afterTokenTransfer(account, address(0), amount);
}

/**
* @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
*
* This internal function is equivalent to `approve`, and can be used to
* e.g. set automatic allowances for certain subsystems, etc.
*
* Emits an {Approval} event.
*
* Requirements:
*
* – `owner` cannot be the zero address.
* – `spender` cannot be the zero address.
*/
function _approve(
address owner,
address spender,
uint256 amount
) internal virtual {
require(owner != address(0), “ERC20: approve from the zero address”);
require(spender != address(0), “ERC20: approve to the zero address”);

_allowances[owner][spender] = amount;
emit Approval(owner, spender, amount);
}

/**
* @dev Hook that is called before any transfer of tokens. This includes
* minting and burning.
*
* Calling conditions:
*
* – when `from` and `to` are both non-zero, `amount` of “from“’s tokens
* will be transferred to `to`.
* – when `from` is zero, `amount` tokens will be minted for `to`.
* – when `to` is zero, `amount` of “from“’s tokens will be burned.
* – `from` and `to` are never both zero.
*
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
*/
function _beforeTokenTransfer(
address from,
address to,
uint256 amount
) internal virtual {}

/**
* @dev Hook that is called after any transfer of tokens. This includes
* minting and burning.
*
* Calling conditions:
*
* – when `from` and `to` are both non-zero, `amount` of “from“’s tokens
* has been transferred to `to`.
* – when `from` is zero, `amount` tokens have been minted for `to`.
* – when `to` is zero, `amount` of “from“’s tokens have been burned.
* – `from` and `to` are never both zero.
*
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
*/
function _afterTokenTransfer(
address from,
address to,
uint256 amount
) internal virtual {}
}

File 3 of 6 : Ownable.sol

// SPDX-License-Identifier: MIT

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() {
_setOwner(_msgSender());
}

/**
* @dev Returns the address of the current owner.
*/
function owner() public view virtual returns (address) {
return _owner;
}

/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(owner() == _msgSender(), “Ownable: caller is not the owner”);
_;
}

/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions anymore. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby removing any functionality that is only available to the owner.
*/
function renounceOwnership() public virtual onlyOwner {
_setOwner(address(0));
}

/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), “Ownable: new owner is the zero address”);
_setOwner(newOwner);
}

function _setOwner(address newOwner) private {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}

File 4 of 6 : IERC20.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256);

/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);

/**
* @dev Moves `amount` tokens from the caller’s account to `recipient`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address recipient, uint256 amount) external returns (bool);

/**
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* zero by default.
*
* This value changes when {approve} or {transferFrom} are called.
*/
function allowance(address owner, address spender) external view returns (uint256);

/**
* @dev Sets `amount` as the allowance of `spender` over the caller’s tokens.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* IMPORTANT: Beware that changing an allowance with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender’s allowance to 0 and set the
* desired value afterwards:
* github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
* Emits an {Approval} event.
*/
function approve(address spender, uint256 amount) external returns (bool);

/**
* @dev Moves `amount` tokens from `sender` to `recipient` using the
* allowance mechanism. `amount` is then deducted from the caller’s
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(
address sender,
address recipient,
uint256 amount
) external returns (bool);

/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);

/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
}

File 5 of 6 : IERC20Metadata.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import “../IERC20.sol”;

/**
* @dev Interface for the optional metadata functions from the ERC20 standard.
*
* _Available since v4.1._
*/
interface IERC20Metadata is IERC20 {
/**
* @dev Returns the name of the token.
*/
function name() external view returns (string memory);

/**
* @dev Returns the symbol of the token.
*/
function symbol() external view returns (string memory);

/**
* @dev Returns the decimals places of the token.
*/
function decimals() external view returns (uint8);
}

File 6 of 6 : Context.sol

// SPDX-License-Identifier: MIT

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;
}
}

MasterChefV2 Smart Contract
File 1 of 10 : MasterChefV2.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.4;

import “@openzeppelin/contracts/token/ERC20/IERC20.sol”;
import “@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol”;
import “@openzeppelin/contracts/security/ReentrancyGuard.sol”;

import “./DeliriumToken.sol”;

// MasterChef is the master of Delirium. He can make Delirium and he is a fair guy.
//
// Note that it’s ownable and the owner wields tremendous power. The ownership
// will be transferred to a governance smart contract once DELIRIUM is sufficiently
// distributed and the community can show to govern itself.
//
// Have fun reading it. Hopefully it’s bug-free. God bless.
contract MasterChefV2 is Ownable, ReentrancyGuard {
using SafeERC20 for IERC20;

// Info of each user.
struct UserInfo {
uint256 amount; // How many LP tokens the user has provided.
uint256 rewardDebt; // Reward debt. See explanation below.
//
// We do some fancy math here. Basically, any point in time, the amount of DELIRIUMs
// entitled to a user but is pending to be distributed is:
//
// pending reward = (user.amount * pool.accDeliriumPerShare) – user.rewardDebt
//
// Whenever a user deposits or withdraws LP tokens to a pool. Here’s what happens:
// 1. The pool’s `accDeliriumPerShare` (and `lastRewardBlock`) gets updated.
// 2. User receives the pending reward sent to his/her address.
// 3. User’s `amount` gets updated.
// 4. User’s `rewardDebt` gets updated.
}

// Info of each pool.
struct PoolInfo {
IERC20 lpToken; // Address of LP token contract.
uint256 allocPoint; // How many allocation points assigned to this pool. DELIRIUMs to distribute per block.
uint256 lastRewardBlock; // Last block number that DELIRIUMs distribution occurs.
uint256 accDeliriumPerShare; // Accumulated DELIRIUMs per share, times 1e12. See below.
uint16 depositFeeBP; // Deposit fee in basis points
uint256 lpSupply;
}

uint256 public deliriumMaximumSupply = 500 * (10 ** 3) * (10 ** 18); // 500,000 delirium

// The DELIRIUM TOKEN!
DeliriumToken public immutable delirium;
// DELIRIUM tokens created per block.
uint256 public deliriumPerBlock;
// Deposit Fee address
address public feeAddress;

// Info of each pool.
PoolInfo[] public poolInfo;
// Info of each user that stakes LP tokens.
mapping(uint256 => mapping(address => UserInfo)) public userInfo;
// Total allocation points. Must be the sum of all allocation points in all pools.
uint256 public totalAllocPoint = 0;
// The block number when DELIRIUM mining starts.
uint256 public startBlock;
// The block number when DELIRIUM mining ends.
uint256 public emmissionEndBlock = type(uint256).max;

event addPool(uint256 indexed pid, address lpToken, uint256 allocPoint, uint256 depositFeeBP);
event setPool(uint256 indexed pid, address lpToken, uint256 allocPoint, uint256 depositFeeBP);
event Deposit(address indexed user, uint256 indexed pid, uint256 amount);
event Withdraw(address indexed user, uint256 indexed pid, uint256 amount);
event EmergencyWithdraw(address indexed user, uint256 indexed pid, uint256 amount);
event SetEmissionRate(address indexed caller, uint256 previousAmount, uint256 newAmount);
event SetFeeAddress(address indexed user, address indexed newAddress);
event SetStartBlock(uint256 newStartBlock);
event SetDeliriumMaximumSupply(uint256 newMaxSupply);

constructor(
DeliriumToken _delirium,
address _feeAddress,
uint256 _deliriumPerBlock,
uint256 _startBlock
) {
require(_feeAddress != address(0), “!nonzero”);

delirium = _delirium;
feeAddress = _feeAddress;
deliriumPerBlock = _deliriumPerBlock;
startBlock = _startBlock;
}

function poolLength() external view returns (uint256) {
return poolInfo.length;
}

mapping(IERC20 => bool) public poolExistence;
modifier nonDuplicated(IERC20 _lpToken) {
require(poolExistence[_lpToken] == false, “nonDuplicated: duplicated”);
_;
}

// Add a new lp to the pool. Can only be called by the owner.
function add(uint256 _allocPoint, IERC20 _lpToken, uint16 _depositFeeBP, bool _withUpdate) external onlyOwner nonDuplicated(_lpToken) {
// Make sure the provided token is ERC20
_lpToken.balanceOf(address(this));

require(_depositFeeBP <= 401, “add: invalid deposit fee basis points”);
if (_withUpdate) {
massUpdatePools();
}
uint256 lastRewardBlock = block.number > startBlock ? block.number : startBlock;
totalAllocPoint = totalAllocPoint + _allocPoint;
poolExistence[_lpToken] = true;

poolInfo.push(PoolInfo({
lpToken : _lpToken,
allocPoint : _allocPoint,
lastRewardBlock : lastRewardBlock,
accDeliriumPerShare : 0,
depositFeeBP : _depositFeeBP,
lpSupply: 0
}));

emit addPool(poolInfo.length – 1, address(_lpToken), _allocPoint, _depositFeeBP);
}

// Update the given pool’s DELIRIUM allocation point and deposit fee. Can only be called by the owner.
function set(uint256 _pid, uint256 _allocPoint, uint16 _depositFeeBP, bool _withUpdate) external onlyOwner {
require(_depositFeeBP <= 401, “set: invalid deposit fee basis points”);
if (_withUpdate) {
massUpdatePools();
}
totalAllocPoint = totalAllocPoint – poolInfo[_pid].allocPoint + _allocPoint;
poolInfo[_pid].allocPoint = _allocPoint;
poolInfo[_pid].depositFeeBP = _depositFeeBP;

emit setPool(_pid, address(poolInfo[_pid].lpToken), _allocPoint, _depositFeeBP);
}

// Return reward multiplier over the given _from to _to block.
function getMultiplier(uint256 _from, uint256 _to) public view returns (uint256) {
// As we set the multiplier to 0 here after emmissionEndBlock
// deposits aren’t blocked after farming ends.
if (_from > emmissionEndBlock)
return 0;
if (_to > emmissionEndBlock)
return emmissionEndBlock – _from;
else
return _to – _from;
}

// View function to see pending DELIRIUMs on frontend.
function pendingDelirium(uint256 _pid, address _user) external view returns (uint256) {
PoolInfo storage pool = poolInfo[_pid];
UserInfo storage user = userInfo[_pid][_user];
uint256 accDeliriumPerShare = pool.accDeliriumPerShare;
if (block.number > pool.lastRewardBlock && pool.lpSupply != 0 && totalAllocPoint > 0) {
uint256 multiplier = getMultiplier(pool.lastRewardBlock, block.number);
uint256 deliriumReward = (multiplier * deliriumPerBlock * pool.allocPoint) / totalAllocPoint;
accDeliriumPerShare = accDeliriumPerShare + ((deliriumReward * 1e12) / pool.lpSupply);
}

return ((user.amount * accDeliriumPerShare) / 1e12) – user.rewardDebt;
}

// Update reward variables for all pools. Be careful of gas spending!
function massUpdatePools() public {
uint256 length = poolInfo.length;
for (uint256 pid = 0; pid < length; ++pid) {
updatePool(pid);
}
}

// Update reward variables of the given pool to be up-to-date.
function updatePool(uint256 _pid) public {
PoolInfo storage pool = poolInfo[_pid];
if (block.number <= pool.lastRewardBlock) {
return;
}

if (pool.lpSupply == 0 || pool.allocPoint == 0) {
pool.lastRewardBlock = block.number;
return;
}

uint256 multiplier = getMultiplier(pool.lastRewardBlock, block.number);
uint256 deliriumReward = (multiplier * deliriumPerBlock * pool.allocPoint) / totalAllocPoint;

// This shouldn’t happen, but just in case we stop rewards.
if (delirium.totalSupply() > deliriumMaximumSupply)
deliriumReward = 0;
else if ((delirium.totalSupply() + deliriumReward) > deliriumMaximumSupply)
deliriumReward = deliriumMaximumSupply – delirium.totalSupply();

if (deliriumReward > 0)
delirium.mint(address(this), deliriumReward);

// The first time we reach Delirium max supply we solidify the end of farming.
if (delirium.totalSupply() >= deliriumMaximumSupply && emmissionEndBlock == type(uint256).max)
emmissionEndBlock = block.number;

pool.accDeliriumPerShare = pool.accDeliriumPerShare + ((deliriumReward * 1e12) / pool.lpSupply);
pool.lastRewardBlock = block.number;
}

// Deposit LP tokens to MasterChef for DELIRIUM allocation.
function deposit(uint256 _pid, uint256 _amount) external nonReentrant {
PoolInfo storage pool = poolInfo[_pid];
UserInfo storage user = userInfo[_pid][msg.sender];
updatePool(_pid);
if (user.amount > 0) {
uint256 pending = ((user.amount * pool.accDeliriumPerShare) / 1e12) – user.rewardDebt;
if (pending > 0) {
safeDeliriumTransfer(msg.sender, pending);
}
}
if (_amount > 0) {
uint256 balanceBefore = pool.lpToken.balanceOf(address(this));
pool.lpToken.safeTransferFrom(address(msg.sender), address(this), _amount);
_amount = pool.lpToken.balanceOf(address(this)) – balanceBefore;
require(_amount > 0, “we dont accept deposits of 0 size”);

if (pool.depositFeeBP > 0) {
uint256 depositFee = (_amount * pool.depositFeeBP) / 10000;
pool.lpToken.safeTransfer(feeAddress, depositFee);
user.amount = user.amount + _amount – depositFee;
pool.lpSupply = pool.lpSupply + _amount – depositFee;
} else {
user.amount = user.amount + _amount;
pool.lpSupply = pool.lpSupply + _amount;
}
}
user.rewardDebt = (user.amount * pool.accDeliriumPerShare) / 1e12;

emit Deposit(msg.sender, _pid, _amount);
}

// Withdraw LP tokens from MasterChef.
function withdraw(uint256 _pid, uint256 _amount) external nonReentrant {
PoolInfo storage pool = poolInfo[_pid];
UserInfo storage user = userInfo[_pid][msg.sender];
require(user.amount >= _amount, “withdraw: not good”);
updatePool(_pid);
uint256 pending = ((user.amount * pool.accDeliriumPerShare) / 1e12) – user.rewardDebt;
if (pending > 0) {
safeDeliriumTransfer(msg.sender, pending);
}
if (_amount > 0) {
user.amount = user.amount – _amount;
pool.lpToken.safeTransfer(address(msg.sender), _amount);
pool.lpSupply = pool.lpSupply – _amount;
}
user.rewardDebt = (user.amount * pool.accDeliriumPerShare) / 1e12;
emit Withdraw(msg.sender, _pid, _amount);
}

// Withdraw without caring about rewards. EMERGENCY ONLY.
function emergencyWithdraw(uint256 _pid) external nonReentrant {
PoolInfo storage pool = poolInfo[_pid];
UserInfo storage user = userInfo[_pid][msg.sender];
uint256 amount = user.amount;
user.amount = 0;
user.rewardDebt = 0;
pool.lpToken.safeTransfer(address(msg.sender), amount);

// In the case of an accounting error, we choose to let the user emergency withdraw anyway
if (pool.lpSupply >= amount)
pool.lpSupply = pool.lpSupply – amount;
else
pool.lpSupply = 0;

emit EmergencyWithdraw(msg.sender, _pid, amount);
}

// Safe delirium transfer function, just in case if rounding error causes pool to not have enough DELIRIUMs.
function safeDeliriumTransfer(address _to, uint256 _amount) internal {
uint256 deliriumBal = delirium.balanceOf(address(this));
bool transferSuccess = false;
if (_amount > deliriumBal) {
transferSuccess = delirium.transfer(_to, deliriumBal);
} else {
transferSuccess = delirium.transfer(_to, _amount);
}
require(transferSuccess, “safeDeliriumTransfer: transfer failed”);
}

function setFeeAddress(address _feeAddress) external onlyOwner {
require(_feeAddress != address(0), “!nonzero”);
feeAddress = _feeAddress;
emit SetFeeAddress(msg.sender, _feeAddress);
}

function setStartBlock(uint256 _newStartBlock) external onlyOwner {
require(block.number < startBlock, “cannot change start block if sale has already commenced”);
require(block.number < _newStartBlock, “cannot set start block in the past”);
startBlock = _newStartBlock;

emit SetStartBlock(startBlock);
}

function setEmissionRate(uint256 _deliriumPerBlock) public onlyOwner {
require(_deliriumPerBlock > 0);

massUpdatePools();
deliriumPerBlock = _deliriumPerBlock;

emit SetEmissionRate(msg.sender, deliriumPerBlock, _deliriumPerBlock);
}
}

File 2 of 10 : IERC20.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256);

/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);

/**
* @dev Moves `amount` tokens from the caller’s account to `recipient`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address recipient, uint256 amount) external returns (bool);

/**
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* zero by default.
*
* This value changes when {approve} or {transferFrom} are called.
*/
function allowance(address owner, address spender) external view returns (uint256);

/**
* @dev Sets `amount` as the allowance of `spender` over the caller’s tokens.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* IMPORTANT: Beware that changing an allowance with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender’s allowance to 0 and set the
* desired value afterwards:
* github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
* Emits an {Approval} event.
*/
function approve(address spender, uint256 amount) external returns (bool);

/**
* @dev Moves `amount` tokens from `sender` to `recipient` using the
* allowance mechanism. `amount` is then deducted from the caller’s
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(
address sender,
address recipient,
uint256 amount
) external returns (bool);

/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);

/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
}

File 3 of 10 : SafeERC20.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import “../IERC20.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));
}
}

/**
* @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”);
}
}
}

File 4 of 10 : ReentrancyGuard.sol

// SPDX-License-Identifier: MIT

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
* blog.openzeppelin.com/reentrancy-after-istanbul/%5BReentrancy 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 make it call a
* `private` function that does the actual work.
*/
modifier nonReentrant() {
// On the first call to nonReentrant, _notEntered will be true
require(_status != _ENTERED, “ReentrancyGuard: reentrant call”);

// Any calls to nonReentrant after this point will fail
_status = _ENTERED;

_;

// By storing the original value once again, a refund is triggered (see
// eips.ethereum.org/EIPS/eip-2200)
_status = _NOT_ENTERED;
}
}

File 5 of 10 : DeliriumToken.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.4;

import “@openzeppelin/contracts/token/ERC20/ERC20.sol”;
import “@openzeppelin/contracts/access/Ownable.sol”;

// DeliriumToken
contract DeliriumToken is ERC20, Ownable {

constructor()
ERC20(‘DELIRIUM’, ‘DELIRIUM’)
{}

/// @notice Creates `_amount` token to `_to`. Must only be called by the owner (MasterChef).
function mint(address _to, uint256 _amount) public onlyOwner {
_mint(_to, _amount);
}
}

File 6 of 10 : Address.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
* @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;
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.
*
* eips.ethereum.org/EIPS/eip-1884%5BEIP1884%5D 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.
*
* diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/%5BLearn more].
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* {ReentrancyGuard} or the
* solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern%5Bchecks-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 solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions%5B`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”);

(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”);

(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 v3.4._
*/
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) {
require(isContract(target), “Address: delegate call to non-contract”);

(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

assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}

File 7 of 10 : ERC20.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import “./IERC20.sol”;
import “./extensions/IERC20Metadata.sol”;
import “../../utils/Context.sol”;

/**
* @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
* forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226%5BHow
* 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, IERC20Metadata {
mapping(address => uint256) private _balances;

mapping(address => mapping(address => uint256)) private _allowances;

uint256 private _totalSupply;

string private _name;
string private _symbol;

/**
* @dev Sets the values for {name} and {symbol}.
*
* The default value of {decimals} is 18. To select a different value for
* {decimals} you should overload it.
*
* All two of these values are immutable: they can only be set once during
* construction.
*/
constructor(string memory name_, string memory symbol_) {
_name = name_;
_symbol = symbol_;
}

/**
* @dev Returns the name of the token.
*/
function name() public view virtual override returns (string memory) {
return _name;
}

/**
* @dev Returns the symbol of the token, usually a shorter version of the
* name.
*/
function symbol() public view virtual override returns (string memory) {
return _symbol;
}

/**
* @dev Returns the number of decimals used to get its user representation.
* For example, if `decimals` equals `2`, a balance of `505` tokens should
* be displayed to a user as `5,05` (`505 / 10 ** 2`).
*
* Tokens usually opt for a value of 18, imitating the relationship between
* Ether and Wei. This is the value {ERC20} uses, unless this function is
* overridden;
*
* NOTE: This information is only used for _display_ purposes: it in
* no way affects any of the arithmetic of the contract, including
* {IERC20-balanceOf} and {IERC20-transfer}.
*/
function decimals() public view virtual override returns (uint8) {
return 18;
}

/**
* @dev See {IERC20-totalSupply}.
*/
function totalSupply() public view virtual override returns (uint256) {
return _totalSupply;
}

/**
* @dev See {IERC20-balanceOf}.
*/
function balanceOf(address account) public view virtual override returns (uint256) {
return _balances[account];
}

/**
* @dev See {IERC20-transfer}.
*
* Requirements:
*
* – `recipient` cannot be the zero address.
* – the caller must have a balance of at least `amount`.
*/
function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
_transfer(_msgSender(), recipient, amount);
return true;
}

/**
* @dev See {IERC20-allowance}.
*/
function allowance(address owner, address spender) public view virtual override returns (uint256) {
return _allowances[owner][spender];
}

/**
* @dev See {IERC20-approve}.
*
* Requirements:
*
* – `spender` cannot be the zero address.
*/
function approve(address spender, uint256 amount) public virtual override returns (bool) {
_approve(_msgSender(), spender, amount);
return true;
}

/**
* @dev See {IERC20-transferFrom}.
*
* Emits an {Approval} event indicating the updated allowance. This is not
* required by the EIP. See the note at the beginning of {ERC20}.
*
* Requirements:
*
* – `sender` and `recipient` cannot be the zero address.
* – `sender` must have a balance of at least `amount`.
* – the caller must have allowance for “sender“’s tokens of at least
* `amount`.
*/
function transferFrom(
address sender,
address recipient,
uint256 amount
) public virtual override returns (bool) {
_transfer(sender, recipient, amount);

uint256 currentAllowance = _allowances[sender][_msgSender()];
require(currentAllowance >= amount, “ERC20: transfer amount exceeds allowance”);
unchecked {
_approve(sender, _msgSender(), currentAllowance – amount);
}

return true;
}

/**
* @dev Atomically increases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* – `spender` cannot be the zero address.
*/
function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
return true;
}

/**
* @dev Atomically decreases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* – `spender` cannot be the zero address.
* – `spender` must have allowance for the caller of at least
* `subtractedValue`.
*/
function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
uint256 currentAllowance = _allowances[_msgSender()][spender];
require(currentAllowance >= subtractedValue, “ERC20: decreased allowance below zero”);
unchecked {
_approve(_msgSender(), spender, currentAllowance – subtractedValue);
}

return true;
}

/**
* @dev Moves `amount` of tokens from `sender` to `recipient`.
*
* This internal function is equivalent to {transfer}, and can be used to
* e.g. implement automatic token fees, slashing mechanisms, etc.
*
* Emits a {Transfer} event.
*
* Requirements:
*
* – `sender` cannot be the zero address.
* – `recipient` cannot be the zero address.
* – `sender` must have a balance of at least `amount`.
*/
function _transfer(
address sender,
address recipient,
uint256 amount
) internal virtual {
require(sender != address(0), “ERC20: transfer from the zero address”);
require(recipient != address(0), “ERC20: transfer to the zero address”);

_beforeTokenTransfer(sender, recipient, amount);

uint256 senderBalance = _balances[sender];
require(senderBalance >= amount, “ERC20: transfer amount exceeds balance”);
unchecked {
_balances[sender] = senderBalance – amount;
}
_balances[recipient] += amount;

emit Transfer(sender, recipient, amount);

_afterTokenTransfer(sender, recipient, amount);
}

/** @dev Creates `amount` tokens and assigns them to `account`, increasing
* the total supply.
*
* Emits a {Transfer} event with `from` set to the zero address.
*
* Requirements:
*
* – `account` cannot be the zero address.
*/
function _mint(address account, uint256 amount) internal virtual {
require(account != address(0), “ERC20: mint to the zero address”);

_beforeTokenTransfer(address(0), account, amount);

_totalSupply += amount;
_balances[account] += amount;
emit Transfer(address(0), account, amount);

_afterTokenTransfer(address(0), account, amount);
}

/**
* @dev Destroys `amount` tokens from `account`, reducing the
* total supply.
*
* Emits a {Transfer} event with `to` set to the zero address.
*
* Requirements:
*
* – `account` cannot be the zero address.
* – `account` must have at least `amount` tokens.
*/
function _burn(address account, uint256 amount) internal virtual {
require(account != address(0), “ERC20: burn from the zero address”);

_beforeTokenTransfer(account, address(0), amount);

uint256 accountBalance = _balances[account];
require(accountBalance >= amount, “ERC20: burn amount exceeds balance”);
unchecked {
_balances[account] = accountBalance – amount;
}
_totalSupply -= amount;

emit Transfer(account, address(0), amount);

_afterTokenTransfer(account, address(0), amount);
}

/**
* @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
*
* This internal function is equivalent to `approve`, and can be used to
* e.g. set automatic allowances for certain subsystems, etc.
*
* Emits an {Approval} event.
*
* Requirements:
*
* – `owner` cannot be the zero address.
* – `spender` cannot be the zero address.
*/
function _approve(
address owner,
address spender,
uint256 amount
) internal virtual {
require(owner != address(0), “ERC20: approve from the zero address”);
require(spender != address(0), “ERC20: approve to the zero address”);

_allowances[owner][spender] = amount;
emit Approval(owner, spender, amount);
}

/**
* @dev Hook that is called before any transfer of tokens. This includes
* minting and burning.
*
* Calling conditions:
*
* – when `from` and `to` are both non-zero, `amount` of “from“’s tokens
* will be transferred to `to`.
* – when `from` is zero, `amount` tokens will be minted for `to`.
* – when `to` is zero, `amount` of “from“’s tokens will be burned.
* – `from` and `to` are never both zero.
*
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
*/
function _beforeTokenTransfer(
address from,
address to,
uint256 amount
) internal virtual {}

/**
* @dev Hook that is called after any transfer of tokens. This includes
* minting and burning.
*
* Calling conditions:
*
* – when `from` and `to` are both non-zero, `amount` of “from“’s tokens
* has been transferred to `to`.
* – when `from` is zero, `amount` tokens have been minted for `to`.
* – when `to` is zero, `amount` of “from“’s tokens have been burned.
* – `from` and `to` are never both zero.
*
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
*/
function _afterTokenTransfer(
address from,
address to,
uint256 amount
) internal virtual {}
}

File 8 of 10 : Ownable.sol

// SPDX-License-Identifier: MIT

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() {
_setOwner(_msgSender());
}

/**
* @dev Returns the address of the current owner.
*/
function owner() public view virtual returns (address) {
return _owner;
}

/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(owner() == _msgSender(), “Ownable: caller is not the owner”);
_;
}

/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions anymore. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby removing any functionality that is only available to the owner.
*/
function renounceOwnership() public virtual onlyOwner {
_setOwner(address(0));
}

/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), “Ownable: new owner is the zero address”);
_setOwner(newOwner);
}

function _setOwner(address newOwner) private {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}

File 9 of 10 : IERC20Metadata.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import “../IERC20.sol”;

/**
* @dev Interface for the optional metadata functions from the ERC20 standard.
*
* _Available since v4.1._
*/
interface IERC20Metadata is IERC20 {
/**
* @dev Returns the name of the token.
*/
function name() external view returns (string memory);

/**
* @dev Returns the symbol of the token.
*/
function symbol() external view returns (string memory);

/**
* @dev Returns the decimals places of the token.
*/
function decimals() external view returns (uint8);
}

File 10 of 10 : Context.sol

// SPDX-License-Identifier: MIT

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;
}
}

Timelock Smart Contract
File 1 of 1 : Timelock.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

contract Timelock {

event NewAdmin(address indexed newAdmin);
event NewPendingAdmin(address indexed newPendingAdmin);
event NewDelay(uint indexed newDelay);
event CancelTransaction(bytes32 indexed txHash, address indexed target, uint value, string signature, bytes data, uint eta);
event ExecuteTransaction(bytes32 indexed txHash, address indexed target, uint value, string signature, bytes data, uint eta);
event QueueTransaction(bytes32 indexed txHash, address indexed target, uint value, string signature, bytes data, uint eta);

uint public constant GRACE_PERIOD = 14 days;
uint public constant MINIMUM_DELAY = 6 hours;
uint public constant MAXIMUM_DELAY = 30 days;

address public admin;
address public pendingAdmin;
uint public delay;
bool public admin_initialized;

mapping (bytes32 => bool) public queuedTransactions;


constructor(address admin_, uint delay_) {
require(delay_ >= MINIMUM_DELAY, “Timelock::constructor: Delay must exceed minimum delay.”);
require(delay_ <= MAXIMUM_DELAY, “Timelock::constructor: Delay must not exceed maximum delay.”);

admin = admin_;
delay = delay_;
admin_initialized = false;
}

// XXX: function() external payable { }
receive() external payable { }

function setDelay(uint delay_) public {
require(msg.sender == address(this), “Timelock::setDelay: Call must come from Timelock.”);
require(delay_ >= MINIMUM_DELAY, “Timelock::setDelay: Delay must exceed minimum delay.”);
require(delay_ <= MAXIMUM_DELAY, “Timelock::setDelay: Delay must not exceed maximum delay.”);
delay = delay_;

emit NewDelay(delay);
}

function acceptAdmin() public {
require(msg.sender == pendingAdmin, “Timelock::acceptAdmin: Call must come from pendingAdmin.”);
admin = msg.sender;
pendingAdmin = address(0);

emit NewAdmin(admin);
}

function setPendingAdmin(address pendingAdmin_) public {
// allows one time setting of admin for deployment purposes
if (admin_initialized) {
require(msg.sender == address(this), “Timelock::setPendingAdmin: Call must come from Timelock.”);
} else {
require(msg.sender == admin, “Timelock::setPendingAdmin: First call must come from admin.”);
admin_initialized = true;
}
pendingAdmin = pendingAdmin_;

emit NewPendingAdmin(pendingAdmin);
}

function queueTransaction(address target, uint value, string memory signature, bytes memory data, uint eta) public returns (bytes32) {
require(msg.sender == admin, “Timelock::queueTransaction: Call must come from admin.”);
require(eta >= getBlockTimestamp() + delay, “Timelock::queueTransaction: Estimated execution block must satisfy delay.”);

bytes32 txHash = keccak256(abi.encode(target, value, signature, data, eta));
queuedTransactions[txHash] = true;

emit QueueTransaction(txHash, target, value, signature, data, eta);
return txHash;
}

function cancelTransaction(address target, uint value, string memory signature, bytes memory data, uint eta) public {
require(msg.sender == admin, “Timelock::cancelTransaction: Call must come from admin.”);

bytes32 txHash = keccak256(abi.encode(target, value, signature, data, eta));
queuedTransactions[txHash] = false;

emit CancelTransaction(txHash, target, value, signature, data, eta);
}

function executeTransaction(address target, uint value, string memory signature, bytes memory data, uint eta) public payable returns (bytes memory) {
require(msg.sender == admin, “Timelock::executeTransaction: Call must come from admin.”);

bytes32 txHash = keccak256(abi.encode(target, value, signature, data, eta));
require(queuedTransactions[txHash], “Timelock::executeTransaction: Transaction hasn’t been queued.”);
require(getBlockTimestamp() >= eta, “Timelock::executeTransaction: Transaction hasn’t surpassed time lock.”);
require(getBlockTimestamp() <= eta + GRACE_PERIOD, “Timelock::executeTransaction: Transaction is stale.”);

queuedTransactions[txHash] = false;

bytes memory callData;

if (bytes(signature).length == 0) {
callData = data;
} else {
callData = abi.encodePacked(bytes4(keccak256(bytes(signature))), data);
}

// solium-disable-next-line security/no-call-value
(bool success, bytes memory returnData) = target.call{value: value}(callData);
require(success, “Timelock::executeTransaction: Transaction execution reverted.”);

emit ExecuteTransaction(txHash, target, value, signature, data, eta);

return returnData;
}

function getBlockTimestamp() internal view returns (uint) {
// solium-disable-next-line security/no-block-members
return block.timestamp;
}
}

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