Contract Source Code (Solidity)

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Outline

•  contract ownable
•    - function transferOwnership(address pa ...
• interface IERC20
•    - function transfer(address _to, uint25 ...
•    - function transferFrom(address _from, ...
• interface IUSDT
•    - function transfer(address _to, uint25 ...
•    - function transferFrom(address _from, ...
•  contract TokenSale is ownable *
•    - function buyTokens(uint256 USDTamount ...
•    - function sellTokens(uint256 tokenAmou ...
•    - function withdrawTokens(IERC20 _token ...
•    - function withdrawUSDT(uint256 _amount ...
•    - function setTokenprice(uint256 _price ...
•    - function updateBuySellStatus(bool buy ...

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/**
 *Submitted for verification at Etherscan.io on 2023-01-08
*/

// SPDX-License-Identifier: MIT
pragma solidity 0.8.17; 


//*******************************************************************//
//------------------ Contract to Manage Ownership -------------------//
//*******************************************************************//
    
contract ownable {
    address payable public owner;

    event OwnershipTransferred(address indexed _from, address indexed _to);

    constructor()  {
        owner = payable(msg.sender);
        emit OwnershipTransferred(address(0), owner);
    }

    modifier onlyOwner {
        require(msg.sender == owner);
        _;
    }

    function transferOwnership(address payable _newOwner) external onlyOwner {
        emit OwnershipTransferred(owner, _newOwner);
        owner = _newOwner;   
    }

}
 

interface IERC20
{
    function transfer(address _to, uint256 _amount) external returns (bool);
    function transferFrom(address _from, address _to, uint256 _amount) external returns (bool);
} 

//USDT has different interface as it does not follow ERC20 standard
interface IUSDT
{
    function transfer(address _to, uint256 _amount) external;
    function transferFrom(address _from, address _to, uint256 _amount) external;
} 

 
//****************************************************************************//
//---------------------        MAIN CODE STARTS HERE     ---------------------//
//****************************************************************************//

contract TokenSale is ownable {

    // token price for USDT in 6 decimals
  uint256 public tokensPerUSDT = 142857142 ; // 142.85 tokens for 1 USDT, which is approx 0.007 USDT price per token

  IUSDT public  USDTToken;
  IERC20 public erc20Token;

  bool public buyEnabled = true;    // by default buy is enabled
  bool public sellEnabled;          // by default sell is disabled
  
  // Event that log buy operation
  event BuyTokens(address buyer, uint256 amountOfETH, uint256 amountOfTokens, uint256 _tokensPerUSDT);
  event SellTokens(address seller, uint256 amountOfTokens, uint256 amountOfETH, uint256 _tokensPerUSDT);


  constructor(IUSDT _USDTToken, IERC20 _CEIToken) {
       USDTToken = _USDTToken;
       erc20Token = _CEIToken;
    }



  /**
  * @notice Allow users to buy token for ETH
  */
  function buyTokens(uint256 USDTamount) external returns (bool) {
    
    // Check if buying is enabled or not
    require(buyEnabled, "Buying is disabled");

    uint256 amountToBuy = USDTamount * 1e12 * tokensPerUSDT/1e6;

    //transfer USDT from user to this contract
    USDTToken.transferFrom(msg.sender,owner, USDTamount);
    // Transfer token to the msg.sender
    erc20Token.transfer(msg.sender, amountToBuy);

    // emit the event
    emit BuyTokens(msg.sender, USDTamount, amountToBuy, tokensPerUSDT);

    return true;
  }

 /**
 * @notice Allow users to sell tokens
 * @notice Owner has to enable this in order for this to work
 */
 function sellTokens(uint256 tokenAmountToSell) external {
    
    // Check if selling is enabled or not
    require(sellEnabled, "Selling is disabled");

    // Check that the Vendor's balance is enough to do the swap
    uint256 amountOfUSDTToTransfer = tokenAmountToSell / (tokensPerUSDT*1e12/1e6);

    erc20Token.transferFrom(msg.sender, owner, tokenAmountToSell);

    USDTToken.transfer(msg.sender, amountOfUSDTToTransfer);

    emit SellTokens(msg.sender, tokenAmountToSell, amountOfUSDTToTransfer, tokensPerUSDT);   

  }



  /**
  * @notice Allow the owner of the contract to do admin functions
  */
  function withdrawTokens(IERC20 _tokenaddress,uint256 _amount) external onlyOwner {
    _tokenaddress.transfer(msg.sender, _amount);
  }

  function withdrawUSDT(uint256 _amount) external onlyOwner {
    USDTToken.transfer(msg.sender, _amount);
  }
  function setTokenprice(uint256 _price) external onlyOwner{
        tokensPerUSDT = _price;
   }
   function updateBuySellStatus(bool buyStatus, bool sellStatus) external onlyOwner{
        buyEnabled = buyStatus;
        sellEnabled = sellStatus;
    }

}

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[{"inputs":[{"internalType":"contract IUSDT","name":"_USDTToken","type":"address"},{"internalType":"contract IERC20","name":"_CEIToken","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"buyer","type":"address"},{"indexed":false,"internalType":"uint256","name":"amountOfETH","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amountOfTokens","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"_tokensPerUSDT","type":"uint256"}],"name":"BuyTokens","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"_from","type":"address"},{"indexed":true,"internalType":"address","name":"_to","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"seller","type":"address"},{"indexed":false,"internalType":"uint256","name":"amountOfTokens","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amountOfETH","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"_tokensPerUSDT","type":"uint256"}],"name":"SellTokens","type":"event"},{"inputs":[],"name":"USDTToken","outputs":[{"internalType":"contract IUSDT","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"buyEnabled","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"USDTamount","type":"uint256"}],"name":"buyTokens","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"erc20Token","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address payable","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"sellEnabled","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenAmountToSell","type":"uint256"}],"name":"sellTokens","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_price","type":"uint256"}],"name":"setTokenprice","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"tokensPerUSDT","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address payable","name":"_newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bool","name":"buyStatus","type":"bool"},{"internalType":"bool","name":"sellStatus","type":"bool"}],"name":"updateBuySellStatus","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract IERC20","name":"_tokenaddress","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"withdrawTokens","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"withdrawUSDT","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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000000000000000000000000dac17f958d2ee523a2206206994597c13d831ec7000000000000000000000000d2372d2d7b252d78f04087c70f7d6ae1dc0fd6f0

-----Decoded View---------------
Arg [0] : _USDTToken (address): 0xdAC17F958D2ee523a2206206994597C13D831ec7
Arg [1] : _CEIToken (address): 0xD2372d2D7b252D78f04087c70F7D6Ae1dC0FD6F0

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000dac17f958d2ee523a2206206994597c13d831ec7
Arg [1] : 000000000000000000000000d2372d2d7b252d78f04087c70f7d6ae1dc0fd6f0

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