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// SPDX-License-Identifier: MIT
pragma solidity 0.8.20;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "../interfaces/IVaultStakingBSC.sol";
import "./Ownable.sol";

/*
 * @title YieldBearingToken
 * @dev A yield token is a token able to reward profit; it is basically an EC20 token.
 */

contract YieldBearingToken is IERC20, Ownable {
    /// @dev token metadata
    string public name;
    string public symbol;
    uint8 public decimals;

    /// @dev rebase variants
    uint256 public totalShares;
    mapping(address => uint256) public shares;
    mapping(address => mapping(address => uint256)) public allowances;
    IVaultStakingBSC public vault;

    error InvalidAmount();
    error SendFail();

    event TransferShares(address indexed from, address indexed to, uint256 sharesValue);

    constructor(string memory _name, string memory _symbol, uint8 _decimals, address _owner) Ownable(_owner) {
        name = _name;
        symbol = _symbol;
        decimals = _decimals;
        vault = IVaultStakingBSC(_owner);
    }

    function mintShares(address _user, uint256 _share) external onlyOwner {
        shares[_user] += _share;
        totalShares += _share;

        emit Transfer(address(0), _user, _share);
        emit TransferShares(address(0), _user, _share);
    }

    function burnShares(address _user, uint256 _share) external {
        require(msg.sender == address(vault) || msg.sender == _user, "Incorrect Caller");
        require(shares[_user] >= _share, "BURN_AMOUNT_EXCEEDS_BALANCE");
        shares[_user] -= _share;
        totalShares -= _share;

        emit Transfer(_user, address(0), _share);
        emit TransferShares(_user, address(0), _share);
    }

    function transfer(address _recipient, uint256 _amount) external override(IERC20) returns (bool) {
        _transfer(msg.sender, _recipient, _amount);
        return true;
    }

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

    function approve(address _spender, uint256 _amount) external override(IERC20) returns (bool) {
        _approve(msg.sender, _spender, _amount);
        return true;
    }

    function increaseAllowance(address _spender, uint256 _increaseAmount) external returns (bool) {
        address owner = msg.sender;
        uint256 currentAllowance = allowance(owner, _spender);
        _approve(owner, _spender, currentAllowance + _increaseAmount);
        return true;
    }

    function decreaseAllowance(address _spender, uint256 _decreaseAmount) external returns (bool) {
        address owner = msg.sender;
        uint256 currentAllowance = allowance(owner, _spender);
        require(currentAllowance >= _decreaseAmount, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, _spender, currentAllowance - _decreaseAmount);
        }
        return true;
    }

    function transferFrom(
        address _sender,
        address _recipient,
        uint256 _amount
    ) external override(IERC20) returns (bool) {
        uint256 currentAllowance = allowances[_sender][msg.sender];
        require(currentAllowance >= _amount, "TRANSFER_AMOUNT_EXCEEDS_ALLOWANCE");
        unchecked {
            _approve(_sender, msg.sender, currentAllowance - _amount);
        }
        _transfer(_sender, _recipient, _amount);
        return true;
    }

    // [INTERNAL FUNCTIONS]
    function _transfer(address _sender, address _recipient, uint256 _amount) internal {
        _transferShares(_sender, _recipient, _amount);
        emit Transfer(_sender, _recipient, _amount);
    }

    function _approve(address _owner, address _spender, uint256 _amount) internal {
        require(_owner != address(0), "APPROVE_FROM_ZERO_ADDRESS");
        require(_spender != address(0), "APPROVE_TO_ZERO_ADDRESS");

        allowances[_owner][_spender] = _amount;
        emit Approval(_owner, _spender, _amount);
    }

    function _transferShares(address _sender, address _recipient, uint256 _sharesAmount) internal {
        require(_sender != address(0), "TRANSFER_FROM_THE_ZERO_ADDRESS");
        require(_recipient != address(0), "TRANSFER_TO_THE_ZERO_ADDRESS");
        require(_sharesAmount <= shares[_sender], "TRANSFER_AMOUNT_EXCEEDS_BALANCE");

        shares[_sender] -= _sharesAmount;
        shares[_recipient] += _sharesAmount;

        emit TransferShares(_sender, _recipient, _sharesAmount);
    }

    // [GETTERS]
    function totalSupply() public view returns (uint256) {
        return totalShares;
    }

    function balanceOf(address _user) public view override(IERC20) returns (uint256) {
        return shares[_user];
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

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

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

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

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

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

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface IVaultStakingBSC {
    struct WithdrawRequest {
        address baseToken;
        uint256 shareOfToken;
        uint256 amountOfToken;
        bool approved;
        bool completed;
    }
    struct RebaseHistory {
        uint256 rebaseAt;
        uint256 amount;
    }

    function amountForShare(address _baseToken, uint256 _share) external view returns (uint256);

    function sharesForAmount(address _baseToken, uint256 _amount) external view returns (uint256);

    function getTotalPooledEther(address _baseToken) external view returns (uint256);

    function getTotalEtherClaimOf(address _baseToken, address _user) external view returns (uint256);
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.20;

abstract contract Ownable {
    event OwnershipTransferred(address indexed user, address indexed newOwner);

    error Unauthorized();
    error InvalidOwner();

    address public owner;

    modifier onlyOwner() virtual {
        if (msg.sender != owner) revert Unauthorized();
        _;
    }

    constructor(address _owner) {
        if (_owner == address(0)) revert InvalidOwner();
        owner = _owner;
        emit OwnershipTransferred(address(0), _owner);
    }

    function transferOwnership(address _owner) public virtual onlyOwner {
        if (_owner == address(0)) revert InvalidOwner();
        owner = _owner;
        emit OwnershipTransferred(msg.sender, _owner);
    }

    function revokeOwnership() public virtual onlyOwner {
        owner = address(0);
        emit OwnershipTransferred(msg.sender, address(0));
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200,
    "details": {
      "yul": true
    }
  },
  "viaIR": true,
  "evmVersion": "paris",
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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der","type":"address"},{"internalType":"address","name":"_recipient","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_owner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"vault","outputs":[{"internalType":"contract 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-----Decoded View---------------
Arg [0] : _name (string): US Dollar Yield Token
Arg [1] : _symbol (string): USYT
Arg [2] : _decimals (uint8): 6
Arg [3] : _owner (address): 0xdc9C2e95811b183752A1c5893182904d4fa7E781

-----Encoded View---------------
8 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [1] : 00000000000000000000000000000000000000000000000000000000000000c0
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000006
Arg [3] : 000000000000000000000000dc9c2e95811b183752a1c5893182904d4fa7e781
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000015
Arg [5] : 555320446f6c6c6172205969656c6420546f6b656e0000000000000000000000
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000004
Arg [7] : 5553595400000000000000000000000000000000000000000000000000000000