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Outline

•    - function tokenReceived(address _from, ...
• library Address
•    - function isContract(address account)
•  contract D223Token *
•    - function name()
•    - function symbol()
•    - function decimals()
•    - function totalSupply()
•    - function standard()
•    - function balanceOf(address _owner)
•    - function transfer(address _to, uint _ ...
•    - function transfer(address _to, uint _ ...
•    - function allowance(address _owner, ad ...
•    - function approve(address _spender, ui ...
•    - function transferFrom(address _from, ...
•    - function rescueERC20(address _token, ...
•    - function newOwner(address _owner)
•    - function claimOwnership()

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/**
 *Submitted for verification at Etherscan.io on 2024-10-31
*/

// SPDX-License-Identifier: GPL-3.0

// Contracts are written by @Dexaran (twitter.com/Dexaran github.com/Dexaran)
// Read more about ERC-223 standard here: dexaran.github.io/erc223
// ERC-223: https://eips.ethereum.org/EIPS/eip-223 & https://github.com/ethereum/eips/issues/223

// D223 is a token of Dex223.io exchange.

pragma solidity >=0.8.2;

abstract contract IERC223Recipient {


 struct ERC223TransferInfo
    {
        address token_contract;
        address sender;
        uint256 value;
        bytes   data;
    }
    
    ERC223TransferInfo private tkn;
    
/**
 * @dev Standard ERC223 function that will handle incoming token transfers.
 *
 * @param _from  Token sender address.
 * @param _value Amount of tokens.
 * @param _data  Transaction metadata.
 */
    function tokenReceived(address _from, uint _value, bytes memory _data) public virtual returns (bytes4)
    {
        /**
         * @dev Note that inside of the token transaction handler the actual sender of token transfer is accessible via the tkn.sender variable
         * (analogue of msg.sender for Ether transfers)
         * 
         * tkn.value - is the amount of transferred tokens
         * tkn.data  - is the "metadata" of token transfer
         * tkn.token_contract is most likely equal to msg.sender because the token contract typically invokes this function
        */
        tkn.token_contract = msg.sender;
        tkn.sender         = _from;
        tkn.value          = _value;
        tkn.data           = _data;
        
        // ACTUAL CODE

        return 0x8943ec02;
    }
}

library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * This test is non-exhaustive, and there may be false-negatives: during the
     * execution of a contract's constructor, its address will be reported as
     * not containing a contract.
     *
     * > It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies in extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }
}

/**
 * @title Reference implementation of the ERC223 standard token.
 */
contract D223Token {

     /**
     * @dev Event that is fired on successful transfer.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);
    event TransferData(bytes);
    event Approval(address indexed owner, address indexed spender, uint256 amount);

    string  private _name;
    string  private _symbol;
    uint8   private _decimals;
    uint256 private _totalSupply;
    address public  owner = msg.sender;
    address public  pending_owner;
    mapping(address account => mapping(address spender => uint256)) private allowances;
    
    mapping(address => uint256) private balances; // List of user balances.

    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
     
    constructor()
    {
        _name     = "Dex223 token";
        _symbol   = "D223";
        _decimals = 18;
        balances[msg.sender] = 8000000000 * 1e18;
        emit Transfer(address(0), msg.sender, balances[msg.sender]);
        emit TransferData(hex"000000");
        _totalSupply = balances[msg.sender];
    }

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

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

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC223} uses, unless {_setupDecimals} is
     * called.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC223-balanceOf} and {IERC223-transfer}.
     */
    function decimals() public view returns (uint8)
    {
        return _decimals;
    }

    /**
     * @dev See {IERC223-totalSupply}.
     */
    function totalSupply() public view returns (uint256)
    {
        return _totalSupply;
    }

    /**
     * @dev See {IERC223-standard}.
     */
    function standard() public pure returns (uint32)
    {
        return 223;
    }

    
    /**
     * @dev Returns balance of the `_owner`.
     *
     * @param _owner   The address whose balance will be returned.
     * @return balance Balance of the `_owner`.
     */
    function balanceOf(address _owner) public view returns (uint256)
    {
        return balances[_owner];
    }
    
    /**
     * @dev Transfer the specified amount of tokens to the specified address.
     *      Invokes the `tokenFallback` function if the recipient is a contract.
     *      The token transfer fails if the recipient is a contract
     *      but does not implement the `tokenFallback` function
     *      or the fallback function to receive funds.
     *
     * @param _to    Receiver address.
     * @param _value Amount of tokens that will be transferred.
     * @param _data  Transaction metadata.
     */
    function transfer(address _to, uint _value, bytes calldata _data) public payable returns (bool success)
    {
        // Standard function transfer similar to ERC20 transfer with no _data .
        // Added due to backwards compatibility reasons.
        if(msg.value > 0) payable(_to).transfer(msg.value);
        balances[msg.sender] = balances[msg.sender] - _value;
        balances[_to] = balances[_to] + _value;
        if(Address.isContract(_to)) {
            IERC223Recipient(_to).tokenReceived(msg.sender, _value, _data);
        }
        emit Transfer(msg.sender, _to, _value);
        emit TransferData(_data);
        return true;
    }
    
    /**
     * @dev Transfer the specified amount of tokens to the specified address.
     *      This function works the same with the previous one
     *      but doesn't contain `_data` param.
     *      Added due to backwards compatibility reasons.
     *
     * @param _to    Receiver address.
     * @param _value Amount of tokens that will be transferred.
     */
    function transfer(address _to, uint _value) public payable returns (bool success)
    {
        if(msg.value > 0) payable(_to).transfer(msg.value);
        bytes memory _empty = hex"00000000";
        balances[msg.sender] = balances[msg.sender] - _value;
        balances[_to] = balances[_to] + _value;
        if(Address.isContract(_to)) {
            IERC223Recipient(_to).tokenReceived(msg.sender, _value, _empty);
        }
        emit Transfer(msg.sender, _to, _value);
        return true;
    }

    // ERC-20 functions for backwards compatibility.

    // Security warning!

    // ERC-20 transferFrom function does not invoke a `tokenReceived` function in the
    // recipient smart-contract. Therefore error handling is not possible
    // and a user can directly deposit tokens to any contract bypassing safety checks
    // or token reception handlers which can result in a loss of funds.
    // This functions are only supported for backwards compatibility reasons
    // and as a last resort when it may be necessary to forcefully transfer tokens
    // to some smart-contract which is not explicitly compatible with the ERC-223 standard.
    //
    // This is not a default method of depsoiting tokens to smart-contracts.
    // `trasnfer` function must be used to deposit tokens to smart-contracts
    // if the recipient supports ERC-223 depositing pattern.
    //
    // `approve` & `transferFrom` pattern must be avoided whenever possible.

    function allowance(address _owner, address spender) public view virtual returns (uint256) {
        return allowances[_owner][spender];
    }

    function approve(address _spender, uint _value) public returns (bool) {

        // Safety checks.
        require(_spender != address(0), "ERC-223: Spender error.");

        allowances[msg.sender][_spender] = _value;
        emit Approval(msg.sender, _spender, _value);
        
        return true;
    }

    function transferFrom(address _from, address _to, uint _value) public returns (bool) {
        
        require(allowances[_from][msg.sender] >= _value, "ERC-223: Insufficient allowance.");
        
        balances[_from] -= _value;
        allowances[_from][msg.sender] -= _value;
        balances[_to] += _value;
        
        emit Transfer(_from, _to, _value);
        
        return true;
    }

    // ERC-20 standard contains a security flaw described here: https://medium.com/dex223/known-problems-of-erc20-token-standard-e98887b9532c
    // ERC-20 tokens do not invoke any callback function upon being deposited to a smart-contract via `transfer` function,
    // therefore it's impossible to handle errors and prevent users from sending tokens to smart-contracts which are not designed to receive them.
    // As of 2024 $83,000,000 worth of ERC-20 tokens were lost due to this flaw: https://dexaran.github.io/erc20-losses/
    // In order to mitigate this issue we are allowing the owner to extract the tokens.
    // You can contact the owner of the contract [email protected] / [email protected] 
    // if you have accidentally deposited tokens to this contract.

    function rescueERC20(address _token, uint256 _value) external
    {
        require(msg.sender == owner);
        (bool success, bytes memory data) = _token.call(abi.encodeWithSelector(0xa9059cbb, msg.sender, _value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), "Transfer failed");
    }

    // In this contract the `owner` can only extract stuck ERC-20 tokens.
    // ERC-20 tokens contain a security flaw that can result in a loss of funds
    // as it's `transfer` function does not implement error handling
    // and therefore tokens can be transferred directly to smart-contract address
    // which is not designed to receive them and instead of resulting in an error
    // it would result in a loss of tokens for the sender.

    function newOwner(address _owner) external
    {
        require(msg.sender == owner);
        pending_owner = _owner;
    }

    function claimOwnership() external
    {
        require(msg.sender == pending_owner);
        owner = pending_owner;
    }
}

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