Qlindo Realestate Investment Token

/*
 * This file is part of the artèQ Technologies contracts (https://github.com/arteq-tech/contracts).
 * Copyright (c) 2022 artèQ Technologies (https://arteq.tech)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, version 3.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
// SPDX-License-Identifier: GNU General Public License v3.0

pragma solidity 0.8.1;

import "./TaskExecutor.sol";

/// @author Kam Amini <kam@arteq.io>
///
/// @notice Use at your own risk
abstract contract AccountLocker is TaskExecutor {

    mapping (address => uint256) private _lockedAccounts;

    event LockTsChanged(address account, uint256 lockTimestamp);

    function updateLockTs(
        uint256 taskId,
        address[] memory accounts,
        uint256[] memory lockTss
    ) external
      tryExecuteTaskAfterwards(taskId)
    {
        require(accounts.length == lockTss.length, "AccountLocker: inputs have incorrect lengths");
        require(accounts.length > 0, "AccountLocker: empty inputs");
        for (uint256 i = 0; i < accounts.length; i++) {
            _updateLockTs(accounts[i], lockTss[i]);
        }
    }

    function _getLockTs(address account) internal view returns (uint256) {
        return _lockedAccounts[account];
    }

    function _updateLockTs(address account, uint256 lockTs) internal {
        uint256 oldLockTs = _lockedAccounts[account];
        _lockedAccounts[account] = lockTs;
        if (oldLockTs != lockTs) {
            emit LockTsChanged(account, lockTs);
        }
    }

    function _isLocked(address account) internal view returns (bool) {
        uint256 lockTs = _getLockTs(account);
        return lockTs > 0 && block.timestamp <= lockTs;
    }
}

/*
 * This file is part of the artèQ Technologies contracts (https://github.com/arteq-tech/contracts).
 * Copyright (c) 2022 artèQ Technologies (https://arteq.tech)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, version 3.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
// SPDX-License-Identifier: GNU General Public License v3.0

pragma solidity 0.8.1;

import "./AccountLocker.sol";

/// @author Kam Amini <kam@arteq.io>
///
/// @notice Use at your own risk
abstract contract BatchTransferEnabled is AccountLocker {

    function doBatchTransferWithLock(
        uint256 taskId,
        address[] memory tos,
        uint256[] memory amounts,
        uint256[] memory lockTss
    ) external
      tryExecuteTaskAfterwards(taskId)
    {
        _doBatchTransferWithLock(tos, amounts, lockTss);
    }

    function _batchTransferSingle(address source, address to, uint256 amount) internal virtual;

    function _doBatchTransferWithLock(
        address[] memory tos,
        uint256[] memory amounts,
        uint256[] memory lockTss
    ) private {
        require(_getTaskManager() != address(0), "BatchTransferEnabled: batch transfer source is not set");
        require(tos.length == amounts.length, "BatchTransferEnabled: inputs have incorrect lengths");
        require(tos.length == lockTss.length, "BatchTransferEnabled: inputs have incorrect lengths");
        require(tos.length > 0, "BatchTransferEnabled: empty inputs");
        for (uint256 i = 0; i < tos.length; i++) {
            require(tos[i] != address(0), "BatchTransferEnabled: target with zero address");
            require(tos[i] != _getTaskManager(), "BatchTransferEnabled: invalid target");
            if (amounts[i] > 0) {
                _batchTransferSingle(_getTaskManager(), tos[i], amounts[i]);
            }
            if (lockTss[i] > 0) {
                _updateLockTs(tos[i], lockTss[i]);
            }
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

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;
    }
}

/*
 * This file is part of the artèQ Technologies contracts (https://github.com/arteq-tech/contracts).
 * Copyright (c) 2022 artèQ Technologies (https://arteq.tech)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, version 3.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
// SPDX-License-Identifier: GNU General Public License v3.0

pragma solidity 0.8.1;

import "@openzeppelin/contracts/interfaces/IERC1155.sol";
import "@openzeppelin/contracts/token/ERC1155/IERC1155Receiver.sol";

/// @author Kam Amini <kam@arteq.io>
///
/// @notice Use at your own risk
abstract contract ERC1155Vault is IERC1155Receiver {

    event ERC1155Transferred(address tokenContract, address to, uint256 tokenId, uint256 amount);
    event ERC1155ApprovedForAll(address tokenContract, address operator, bool approved);

    function supportsInterface(bytes4 interfaceId) external view virtual override returns (bool) {
        return interfaceId == type(IERC1155Receiver).interfaceId;
    }

    function onERC1155Received(
        address /* operator */,
        address /* from */,
        uint256 /* id */,
        uint256 /* value */,
        bytes calldata /* data */
    ) external pure override returns (bytes4) {
        return bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"));
    }

    function onERC1155BatchReceived(
        address /* operator */,
        address /* from */,
        uint256[] calldata /* ids */,
        uint256[] calldata /* values */,
        bytes calldata /* data */
    ) external pure override returns (bytes4) {
        return bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"));
    }

    function _ERC1155Transfer(
        address tokenContract,
        address to,
        uint256 tokenId,
        uint256 amount
    ) internal {
        require(tokenContract != address(0), "ERC1155Vault: zero token address");
        require(to != address(0), "ERC1155Vault: cannot transfer to zero");

        IERC1155(tokenContract).safeTransferFrom(address(this), to, tokenId, amount, "");
        emit ERC1155Transferred(tokenContract, to, tokenId, amount);
    }

    function _ERC1155SetApprovalForAll(
        address tokenContract,
        address operator,
        bool approved
    ) internal {
        require(tokenContract != address(0), "ERC1155Vault: zero token address");
        require(operator != address(0), "ERC1155Vault: zero address for operator");

        IERC1155(tokenContract).setApprovalForAll(operator, approved);
        emit ERC1155ApprovedForAll(tokenContract, operator, approved);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/ERC20.sol)

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
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead 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:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, 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}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, 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}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, 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) {
        address owner = _msgSender();
        _approve(owner, spender, _allowances[owner][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) {
        address owner = _msgSender();
        uint256 currentAllowance = _allowances[owner][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, 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:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
        }
        _balances[to] += amount;

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, 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 Spend `amount` form the allowance of `owner` toward `spender`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - 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 {}
}

/*
 * This file is part of the artèQ Technologies contracts (https://github.com/arteq-tech/contracts).
 * Copyright (c) 2022 artèQ Technologies (https://arteq.tech)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, version 3.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
// SPDX-License-Identifier: GNU General Public License v3.0

pragma solidity 0.8.1;

import "@openzeppelin/contracts/interfaces/IERC20.sol";

/// @author Kam Amini <kam@arteq.io>
///
/// @notice Use at your own risk
abstract contract ERC20Vault {

    event ERC20Transferred(address tokenContract, address to, uint256 amount);
    event ERC20Approved(address tokenContract, address spender, uint256 amount);

    function _ERC20Transfer(
        address tokenContract,
        address to,
        uint256 amount
    ) internal {
        require(tokenContract != address(0), "ERC20Vault: zero token address");
        require(to != address(0), "ERC20Vault: cannot transfer to zero");
        require(amount > 0, "ERC20Vault: amount is zero");
        require(amount <= IERC20(tokenContract).balanceOf(address(this)),
                                "ERC20Vault: transfer more than balance");

        IERC20(tokenContract).transfer(to, amount);
        emit ERC20Transferred(tokenContract, to, amount);
    }

    function _ERC20Approve(
        address tokenContract,
        address spender,
        uint256 amount
    ) internal {
        require(tokenContract != address(0), "ERC20Vault: zero token address");
        require(spender != address(0), "ERC20Vault: zero address for spender");

        IERC20(tokenContract).approve(spender, amount);
        emit ERC20Approved(tokenContract, spender, amount);
    }
}

/*
 * This file is part of the artèQ Technologies contracts (https://github.com/arteq-tech/contracts).
 * Copyright (c) 2022 artèQ Technologies (https://arteq.tech)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, version 3.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
// SPDX-License-Identifier: GNU General Public License v3.0

pragma solidity 0.8.1;

import "@openzeppelin/contracts/interfaces/IERC721.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol";

/// @author Kam Amini <kam@arteq.io>
///
/// @notice Use at your own risk
abstract contract ERC721Vault is IERC721Receiver {

    event ERC721Transferred(address tokenContract, address to, uint256 tokenId);
    event ERC721Approved(address tokenContract, address to, uint256 tokenId);
    event ERC721ApprovedForAll(address tokenContract, address operator, bool approved);

    function onERC721Received(
        address /* operator */,
        address /* from */,
        uint256 /* tokenId */,
        bytes calldata /* data */
    ) external pure override returns (bytes4) {
        return bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"));
    }

    function _ERC721Transfer(
        address tokenContract,
        address to,
        uint256 tokenId
    ) internal {
        require(tokenContract != address(0), "ERC721Vault: zero token address");
        require(to != address(0), "ERC721Vault: cannot transfer to zero");

        IERC721(tokenContract).safeTransferFrom(address(this), to, tokenId, "");
        emit ERC721Transferred(tokenContract, to, tokenId);
    }

    // operator can be the zero address.
    function _ERC721Approve(
        address tokenContract,
        address operator,
        uint256 tokenId
    ) internal {
        require(tokenContract != address(0), "ERC721Vault: zero token address");

        IERC721(tokenContract).approve(operator, tokenId);
        emit ERC721Approved(tokenContract, operator, tokenId);
    }

    function _ERC721SetApprovalForAll(
        address tokenContract,
        address operator,
        bool approved
    ) internal {
        require(tokenContract != address(0), "ERC721Vault: zero token address");
        require(operator != address(0), "ERC721Vault: zero address for operator");

        IERC721(tokenContract).setApprovalForAll(operator, approved);
        emit ERC721ApprovedForAll(tokenContract, operator, approved);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC1155/IERC1155.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC1155 compliant contract, as defined in the
 * https://eips.ethereum.org/EIPS/eip-1155[EIP].
 *
 * _Available since v3.1._
 */
interface IERC1155 is IERC165 {
    /**
     * @dev Emitted when `value` tokens of token type `id` are transferred from `from` to `to` by `operator`.
     */
    event TransferSingle(address indexed operator, address indexed from, address indexed to, uint256 id, uint256 value);

    /**
     * @dev Equivalent to multiple {TransferSingle} events, where `operator`, `from` and `to` are the same for all
     * transfers.
     */
    event TransferBatch(
        address indexed operator,
        address indexed from,
        address indexed to,
        uint256[] ids,
        uint256[] values
    );

    /**
     * @dev Emitted when `account` grants or revokes permission to `operator` to transfer their tokens, according to
     * `approved`.
     */
    event ApprovalForAll(address indexed account, address indexed operator, bool approved);

    /**
     * @dev Emitted when the URI for token type `id` changes to `value`, if it is a non-programmatic URI.
     *
     * If an {URI} event was emitted for `id`, the standard
     * https://eips.ethereum.org/EIPS/eip-1155#metadata-extensions[guarantees] that `value` will equal the value
     * returned by {IERC1155MetadataURI-uri}.
     */
    event URI(string value, uint256 indexed id);

    /**
     * @dev Returns the amount of tokens of token type `id` owned by `account`.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function balanceOf(address account, uint256 id) external view returns (uint256);

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {balanceOf}.
     *
     * Requirements:
     *
     * - `accounts` and `ids` must have the same length.
     */
    function balanceOfBatch(address[] calldata accounts, uint256[] calldata ids)
        external
        view
        returns (uint256[] memory);

    /**
     * @dev Grants or revokes permission to `operator` to transfer the caller's tokens, according to `approved`,
     *
     * Emits an {ApprovalForAll} event.
     *
     * Requirements:
     *
     * - `operator` cannot be the caller.
     */
    function setApprovalForAll(address operator, bool approved) external;

    /**
     * @dev Returns true if `operator` is approved to transfer ``account``'s tokens.
     *
     * See {setApprovalForAll}.
     */
    function isApprovedForAll(address account, address operator) external view returns (bool);

    /**
     * @dev Transfers `amount` tokens of token type `id` from `from` to `to`.
     *
     * Emits a {TransferSingle} event.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - If the caller is not `from`, it must be have been approved to spend ``from``'s tokens via {setApprovalForAll}.
     * - `from` must have a balance of tokens of type `id` of at least `amount`.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the
     * acceptance magic value.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 id,
        uint256 amount,
        bytes calldata data
    ) external;

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {safeTransferFrom}.
     *
     * Emits a {TransferBatch} event.
     *
     * Requirements:
     *
     * - `ids` and `amounts` must have the same length.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the
     * acceptance magic value.
     */
    function safeBatchTransferFrom(
        address from,
        address to,
        uint256[] calldata ids,
        uint256[] calldata amounts,
        bytes calldata data
    ) external;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC1155/IERC1155Receiver.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @dev _Available since v3.1._
 */
interface IERC1155Receiver is IERC165 {
    /**
     * @dev Handles the receipt of a single ERC1155 token type. This function is
     * called at the end of a `safeTransferFrom` after the balance has been updated.
     *
     * NOTE: To accept the transfer, this must return
     * `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))`
     * (i.e. 0xf23a6e61, or its own function selector).
     *
     * @param operator The address which initiated the transfer (i.e. msg.sender)
     * @param from The address which previously owned the token
     * @param id The ID of the token being transferred
     * @param value The amount of tokens being transferred
     * @param data Additional data with no specified format
     * @return `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))` if transfer is allowed
     */
    function onERC1155Received(
        address operator,
        address from,
        uint256 id,
        uint256 value,
        bytes calldata data
    ) external returns (bytes4);

    /**
     * @dev Handles the receipt of a multiple ERC1155 token types. This function
     * is called at the end of a `safeBatchTransferFrom` after the balances have
     * been updated.
     *
     * NOTE: To accept the transfer(s), this must return
     * `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))`
     * (i.e. 0xbc197c81, or its own function selector).
     *
     * @param operator The address which initiated the batch transfer (i.e. msg.sender)
     * @param from The address which previously owned the token
     * @param ids An array containing ids of each token being transferred (order and length must match values array)
     * @param values An array containing amounts of each token being transferred (order and length must match ids array)
     * @param data Additional data with no specified format
     * @return `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))` if transfer is allowed
     */
    function onERC1155BatchReceived(
        address operator,
        address from,
        uint256[] calldata ids,
        uint256[] calldata values,
        bytes calldata data
    ) external returns (bytes4);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (interfaces/IERC165.sol)

pragma solidity ^0.8.0;

import "../utils/introspection/IERC165.sol";

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/IERC20.sol)

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 `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

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

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

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

    /**
     * @dev 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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (interfaces/IERC721.sol)

pragma solidity ^0.8.0;

import "../token/ERC721/IERC721.sol";

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

/*
 * This file is part of the artèQ Technologies contracts (https://github.com/arteq-tech/contracts).
 * Copyright (c) 2022 artèQ Technologies (https://arteq.tech)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, version 3.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
// SPDX-License-Identifier: GNU General Public License v3.0

pragma solidity 0.8.1;

/// @author Kam Amini <kam@arteq.io>
///
/// @notice Use at your own risk
interface ITaskExecutor {

    event TaskExecuted(address finalizer, address executor, uint256 taskId);

    function executeTask(address executor, uint256 taskId) external;

    function executeAdminTask(address executor, uint256 taskId) external;
}

/*
 * This file is part of the artèQ Technologies contracts (https://github.com/arteq-tech/contracts).
 * Copyright (c) 2022 artèQ Technologies (https://arteq.tech)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, version 3.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
// SPDX-License-Identifier: GNU General Public License v3.0

pragma solidity 0.8.1;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import "./arteq-tech/contracts/abstract/task-managed/AccountLocker.sol";
import "./arteq-tech/contracts/abstract/task-managed/BatchTransferEnabled.sol";
import "./arteq-tech/contracts/abstract/task-managed/TaskManagedERC20VaultEnabled.sol";
import "./arteq-tech/contracts/abstract/task-managed/TaskManagedERC721VaultEnabled.sol";
import "./arteq-tech/contracts/abstract/task-managed/TaskManagedERC1155VaultEnabled.sol";

/// @author Kam Amini <kam@arteq.io> <kam.cpp@gmail.com>
///
/// @notice Use at your own risk
contract QLINDO is
  ERC20,
  AccountLocker,
  BatchTransferEnabled,
  TaskManagedERC20VaultEnabled,
  TaskManagedERC721VaultEnabled,
  TaskManagedERC1155VaultEnabled
{
    constructor(address taskManager)
      ERC20("Qlindo Realestate Investment Token", "QLINDO")
    {
        require(taskManager != address(0), "QLINDO: zero address set for task manager");
        _setTaskManager(taskManager);
        _mint(_getTaskManager(), 10 * 10 ** 9); // 10 billion tokens
    }

    function decimals() public view virtual override returns (uint8) {
        return 0;
    }

    function _beforeTokenTransfer(
        address from,
        address /*to*/,
        uint256 /*amount*/
    ) internal virtual override {
        require(!_isLocked(from), "QLINDO: account cannot transfer tokens");
    }

    function _batchTransferSingle(
        address source,
        address to,
        uint256 amount
    ) internal virtual override {
        _transfer(source, to, amount);
    }

    receive() external payable {
        revert("QLINDO: cannot accept ether");
    }

    fallback() external payable {
        revert("QLINDO: cannot accept ether");
    }
}

/*
 * This file is part of the artèQ Technologies contracts (https://github.com/arteq-tech/contracts).
 * Copyright (c) 2022 artèQ Technologies (https://arteq.tech)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, version 3.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
// SPDX-License-Identifier: GNU General Public License v3.0

pragma solidity 0.8.1;

import "@openzeppelin/contracts/interfaces/IERC165.sol";
import "../../interfaces/ITaskExecutor.sol";

/// @author Kam Amini <kam@arteq.io>
///
/// @notice Use at your own risk
abstract contract TaskExecutor {

    address private _taskManager;

    event TaskManagerChanged(address newTaskManager);

    modifier tryExecuteTaskAfterwards(uint256 taskId) {
        require(_taskManager != address(0), "TaskExecutor: task manager is not set");
        _;
        ITaskExecutor(_taskManager).executeTask(msg.sender, taskId);
    }

    function getTaskManager() external view returns (address) {
        return _getTaskManager();
    }

    function setTaskManager(
        uint256 adminTaskId,
        address newTaskManager
    ) external {
        address oldTaskManager = _taskManager;
        _setTaskManager(newTaskManager);
        if (oldTaskManager != address(0)) {
            ITaskExecutor(oldTaskManager).executeAdminTask(msg.sender, adminTaskId);
        }
    }

    function _getTaskManager() internal view returns (address) {
        return _taskManager;
    }

    function _setTaskManager(address newTaskManager) internal {
        require(newTaskManager != address(0), "TaskExecutor: zero address cannot be set");
        require(IERC165(newTaskManager).supportsInterface(type(ITaskExecutor).interfaceId),
            "TaskExecutor: invalid contract");
        _taskManager = newTaskManager;
        emit TaskManagerChanged(_taskManager);
    }
}

/*
 * This file is part of the artèQ Technologies contracts (https://github.com/arteq-tech/contracts).
 * Copyright (c) 2022 artèQ Technologies (https://arteq.tech)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, version 3.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
// SPDX-License-Identifier: GNU General Public License v3.0

pragma solidity 0.8.1;

import "../ERC1155Vault.sol";
import "./TaskExecutor.sol";

/// @author Kam Amini <kam@arteq.io>
///
/// @notice Use at your own risk
abstract contract TaskManagedERC1155VaultEnabled is TaskExecutor, ERC1155Vault {

    function ERC1155Transfer(
        uint256 taskId,
        address tokenContract,
        address to,
        uint256 tokenId,
        uint256 amount
    ) external
      tryExecuteTaskAfterwards(taskId)
    {
        _ERC1155Transfer(tokenContract, to, tokenId, amount);
    }

    function ERC1155SetApprovalForAll(
        uint256 taskId,
        address tokenContract,
        address operator,
        bool approved
    ) external
      tryExecuteTaskAfterwards(taskId)
    {
        _ERC1155SetApprovalForAll(tokenContract, operator, approved);
    }
}

/*
 * This file is part of the artèQ Technologies contracts (https://github.com/arteq-tech/contracts).
 * Copyright (c) 2022 artèQ Technologies (https://arteq.tech)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, version 3.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
// SPDX-License-Identifier: GNU General Public License v3.0

pragma solidity 0.8.1;

import "../ERC20Vault.sol";
import "./TaskExecutor.sol";

/// @author Kam Amini <kam@arteq.io>
///
/// @notice Use at your own risk
abstract contract TaskManagedERC20VaultEnabled is TaskExecutor, ERC20Vault {

    function ERC20Transfer(
        uint256 taskId,
        address tokenContract,
        address to,
        uint256 amount
    ) external
      tryExecuteTaskAfterwards(taskId)
    {
        _ERC20Transfer(tokenContract, to, amount);
    }

    function ERC20Approve(
        uint256 taskId,
        address tokenContract,
        address spender,
        uint256 amount
    ) external
      tryExecuteTaskAfterwards(taskId)
    {
        _ERC20Approve(tokenContract, spender, amount);
    }
}

/*
 * This file is part of the artèQ Technologies contracts (https://github.com/arteq-tech/contracts).
 * Copyright (c) 2022 artèQ Technologies (https://arteq.tech)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, version 3.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
// SPDX-License-Identifier: GNU General Public License v3.0

pragma solidity 0.8.1;

import "../ERC721Vault.sol";
import "./TaskExecutor.sol";

/// @author Kam Amini <kam@arteq.io>
///
/// @notice Use at your own risk
abstract contract TaskManagedERC721VaultEnabled is TaskExecutor, ERC721Vault {

    function ERC721Transfer(
        uint256 taskId,
        address tokenContract,
        address to,
        uint256 tokenId
    ) external
      tryExecuteTaskAfterwards(taskId)
    {
        _ERC721Transfer(tokenContract, to, tokenId);
    }

    function ERC721Approve(
        uint256 taskId,
        address tokenContract,
        address operator,
        uint256 tokenId
    ) external
      tryExecuteTaskAfterwards(taskId)
    {
        _ERC721Approve(tokenContract, operator, tokenId);
    }

    function ERC721SetApprovalForAll(
        uint256 taskId,
        address tokenContract,
        address operator,
        bool approved
    ) external
      tryExecuteTaskAfterwards(taskId)
    {
        _ERC721SetApprovalForAll(tokenContract, operator, approved);
    }
}

{
  "compilationTarget": {
    "contracts/QLINDO.sol": "QLINDO"
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 2000
  },
  "remappings": []
}