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// SPDX-License-Identifier: GPL-3.0
/* ———————————————————————————————————————————————————————————————————————————————— *
 *    _____     ______   ______     __     __   __     __     ______   __  __       *
 *   /\  __-.  /\__  _\ /\  == \   /\ \   /\ "-.\ \   /\ \   /\__  _\ /\ \_\ \      *
 *   \ \ \/\ \ \/_/\ \/ \ \  __<   \ \ \  \ \ \-.  \  \ \ \  \/_/\ \/ \ \____ \     *
 *    \ \____-    \ \_\  \ \_\ \_\  \ \_\  \ \_\\"\_\  \ \_\    \ \_\  \/\_____\    *
 *     \/____/     \/_/   \/_/ /_/   \/_/   \/_/ \/_/   \/_/     \/_/   \/_____/    *
 *                                                                                  *
 * ————————————————————————————————— dtrinity.org ————————————————————————————————— *
 *                                                                                  *
 *                                         ▲                                        *
 *                                        ▲ ▲                                       *
 *                                                                                  *
 * ———————————————————————————————————————————————————————————————————————————————— *
 * dTRINITY Protocol: https://github.com/dtrinity                                   *
 * ———————————————————————————————————————————————————————————————————————————————— */

pragma solidity ^0.8.10;

import {IERC20} from "contracts/lending/core/dependencies/openzeppelin/contracts/IERC20.sol";
import {IStreamable} from "./interfaces/IStreamable.sol";
import {AdminControlledEcosystemReserve} from "./AdminControlledEcosystemReserve.sol";
import {ReentrancyGuard} from "./libs/ReentrancyGuard.sol";
import {SafeERC20} from "./libs/SafeERC20.sol";

/**
 * @title AaveEcosystemReserve v2
 * @notice Stores ERC20 tokens of an ecosystem reserve, adding streaming capabilities.
 * Modification of Sablier https://github.com/sablierhq/sablier/blob/develop/packages/protocol/contracts/Sablier.sol
 * Original can be found also deployed on https://etherscan.io/address/0xCD18eAa163733Da39c232722cBC4E8940b1D8888
 * Modifications:
 * - Sablier "pulls" the funds from the creator of the stream at creation. In the Aave case, we already have the funds.
 * - Anybody can create streams on Sablier. Here, only the funds admin (Aave governance via controller) can
 * - Adapted codebase to Solidity 0.8.11, mainly removing SafeMath and CarefulMath to use native safe math
 * - Same as with creation, on Sablier the `sender` and `recipient` can cancel a stream. Here, only fund admin and recipient
 * @author BGD Labs
 **/
contract AaveEcosystemReserveV2 is
    AdminControlledEcosystemReserve,
    ReentrancyGuard,
    IStreamable
{
    using SafeERC20 for IERC20;

    /*** Storage Properties ***/

    /**
     * @notice Counter for new stream ids.
     */
    uint256 private _nextStreamId;

    /**
     * @notice The stream objects identifiable by their unsigned integer ids.
     */
    mapping(uint256 => Stream) private _streams;

    /*** Modifiers ***/

    /**
     * @dev Throws if the caller is not the funds admin of the recipient of the stream.
     */
    modifier onlyAdminOrRecipient(uint256 streamId) {
        require(
            msg.sender == _fundsAdmin ||
                msg.sender == _streams[streamId].recipient,
            "caller is not the funds admin or the recipient of the stream"
        );
        _;
    }

    /**
     * @dev Throws if the provided id does not point to a valid stream.
     */
    modifier streamExists(uint256 streamId) {
        require(_streams[streamId].isEntity, "stream does not exist");
        _;
    }

    /*** Contract Logic Starts Here */

    function initialize(address fundsAdmin) external initializer {
        _nextStreamId = 100000;
        _setFundsAdmin(fundsAdmin);
    }

    /*** View Functions ***/

    /**
     * @notice Returns the next available stream id
     * @notice Returns the stream id.
     */
    function getNextStreamId() external view returns (uint256) {
        return _nextStreamId;
    }

    /**
     * @notice Returns the stream with all its properties.
     * @dev Throws if the id does not point to a valid stream.
     * @param streamId The id of the stream to query.
     * @notice Returns the stream object.
     */
    function getStream(
        uint256 streamId
    )
        external
        view
        streamExists(streamId)
        returns (
            address sender,
            address recipient,
            uint256 deposit,
            address tokenAddress,
            uint256 startTime,
            uint256 stopTime,
            uint256 remainingBalance,
            uint256 ratePerSecond
        )
    {
        sender = _streams[streamId].sender;
        recipient = _streams[streamId].recipient;
        deposit = _streams[streamId].deposit;
        tokenAddress = _streams[streamId].tokenAddress;
        startTime = _streams[streamId].startTime;
        stopTime = _streams[streamId].stopTime;
        remainingBalance = _streams[streamId].remainingBalance;
        ratePerSecond = _streams[streamId].ratePerSecond;
    }

    /**
     * @notice Returns either the delta in seconds between `block.timestamp` and `startTime` or
     *  between `stopTime` and `startTime, whichever is smaller. If `block.timestamp` is before
     *  `startTime`, it returns 0.
     * @dev Throws if the id does not point to a valid stream.
     * @param streamId The id of the stream for which to query the delta.
     * @notice Returns the time delta in seconds.
     */
    function deltaOf(
        uint256 streamId
    ) public view streamExists(streamId) returns (uint256 delta) {
        Stream memory stream = _streams[streamId];
        if (block.timestamp <= stream.startTime) return 0;
        if (block.timestamp < stream.stopTime)
            return block.timestamp - stream.startTime;
        return stream.stopTime - stream.startTime;
    }

    struct BalanceOfLocalVars {
        uint256 recipientBalance;
        uint256 withdrawalAmount;
        uint256 senderBalance;
    }

    /**
     * @notice Returns the available funds for the given stream id and address.
     * @dev Throws if the id does not point to a valid stream.
     * @param streamId The id of the stream for which to query the balance.
     * @param who The address for which to query the balance.
     * @notice Returns the total funds allocated to `who` as uint256.
     */
    function balanceOf(
        uint256 streamId,
        address who
    ) public view streamExists(streamId) returns (uint256 balance) {
        Stream memory stream = _streams[streamId];
        BalanceOfLocalVars memory vars;

        uint256 delta = deltaOf(streamId);
        vars.recipientBalance = delta * stream.ratePerSecond;

        /*
         * If the stream `balance` does not equal `deposit`, it means there have been withdrawals.
         * We have to subtract the total amount withdrawn from the amount of money that has been
         * streamed until now.
         */
        if (stream.deposit > stream.remainingBalance) {
            vars.withdrawalAmount = stream.deposit - stream.remainingBalance;
            vars.recipientBalance =
                vars.recipientBalance -
                vars.withdrawalAmount;
        }

        if (who == stream.recipient) return vars.recipientBalance;
        if (who == stream.sender) {
            vars.senderBalance =
                stream.remainingBalance -
                vars.recipientBalance;
            return vars.senderBalance;
        }
        return 0;
    }

    /*** Public Effects & Interactions Functions ***/

    struct CreateStreamLocalVars {
        uint256 duration;
        uint256 ratePerSecond;
    }

    /**
     * @notice Creates a new stream funded by this contracts itself and paid towards `recipient`.
     * @dev Throws if the recipient is the zero address, the contract itself or the caller.
     *  Throws if the deposit is 0.
     *  Throws if the start time is before `block.timestamp`.
     *  Throws if the stop time is before the start time.
     *  Throws if the duration calculation has a math error.
     *  Throws if the deposit is smaller than the duration.
     *  Throws if the deposit is not a multiple of the duration.
     *  Throws if the rate calculation has a math error.
     *  Throws if the next stream id calculation has a math error.
     *  Throws if the contract is not allowed to transfer enough tokens.
     *  Throws if there is a token transfer failure.
     * @param recipient The address towards which the money is streamed.
     * @param deposit The amount of money to be streamed.
     * @param tokenAddress The ERC20 token to use as streaming currency.
     * @param startTime The unix timestamp for when the stream starts.
     * @param stopTime The unix timestamp for when the stream stops.
     * @notice Returns the uint256 id of the newly created stream.
     */
    function createStream(
        address recipient,
        uint256 deposit,
        address tokenAddress,
        uint256 startTime,
        uint256 stopTime
    ) external onlyFundsAdmin returns (uint256) {
        require(recipient != address(0), "stream to the zero address");
        require(recipient != address(this), "stream to the contract itself");
        require(recipient != msg.sender, "stream to the caller");
        require(deposit > 0, "deposit is zero");
        require(
            startTime >= block.timestamp,
            "start time before block.timestamp"
        );
        require(stopTime > startTime, "stop time before the start time");

        CreateStreamLocalVars memory vars;
        vars.duration = stopTime - startTime;

        /* Without this, the rate per second would be zero. */
        require(deposit >= vars.duration, "deposit smaller than time delta");

        /* This condition avoids dealing with remainders */
        require(
            deposit % vars.duration == 0,
            "deposit not multiple of time delta"
        );

        vars.ratePerSecond = deposit / vars.duration;

        /* Create and store the stream object. */
        uint256 streamId = _nextStreamId;
        _streams[streamId] = Stream({
            remainingBalance: deposit,
            deposit: deposit,
            isEntity: true,
            ratePerSecond: vars.ratePerSecond,
            recipient: recipient,
            sender: address(this),
            startTime: startTime,
            stopTime: stopTime,
            tokenAddress: tokenAddress
        });

        /* Increment the next stream id. */
        _nextStreamId++;

        emit CreateStream(
            streamId,
            address(this),
            recipient,
            deposit,
            tokenAddress,
            startTime,
            stopTime
        );
        return streamId;
    }

    /**
     * @notice Withdraws from the contract to the recipient's account.
     * @dev Throws if the id does not point to a valid stream.
     *  Throws if the caller is not the funds admin or the recipient of the stream.
     *  Throws if the amount exceeds the available balance.
     *  Throws if there is a token transfer failure.
     * @param streamId The id of the stream to withdraw tokens from.
     * @param amount The amount of tokens to withdraw.
     */
    function withdrawFromStream(
        uint256 streamId,
        uint256 amount
    )
        external
        nonReentrant
        streamExists(streamId)
        onlyAdminOrRecipient(streamId)
        returns (bool)
    {
        require(amount > 0, "amount is zero");
        Stream memory stream = _streams[streamId];

        uint256 balance = balanceOf(streamId, stream.recipient);
        require(balance >= amount, "amount exceeds the available balance");

        _streams[streamId].remainingBalance = stream.remainingBalance - amount;

        if (_streams[streamId].remainingBalance == 0) delete _streams[streamId];

        IERC20(stream.tokenAddress).safeTransfer(stream.recipient, amount);
        emit WithdrawFromStream(streamId, stream.recipient, amount);
        return true;
    }

    /**
     * @notice Cancels the stream and transfers the tokens back on a pro rata basis.
     * @dev Throws if the id does not point to a valid stream.
     *  Throws if the caller is not the funds admin or the recipient of the stream.
     *  Throws if there is a token transfer failure.
     * @param streamId The id of the stream to cancel.
     * @notice Returns bool true=success, otherwise false.
     */
    function cancelStream(
        uint256 streamId
    )
        external
        nonReentrant
        streamExists(streamId)
        onlyAdminOrRecipient(streamId)
        returns (bool)
    {
        Stream memory stream = _streams[streamId];
        uint256 senderBalance = balanceOf(streamId, stream.sender);
        uint256 recipientBalance = balanceOf(streamId, stream.recipient);

        delete _streams[streamId];

        IERC20 token = IERC20(stream.tokenAddress);
        if (recipientBalance > 0)
            token.safeTransfer(stream.recipient, recipientBalance);

        emit CancelStream(
            streamId,
            stream.sender,
            stream.recipient,
            senderBalance,
            recipientBalance
        );
        return true;
    }
}

// SPDX-License-Identifier: AGPL-3.0
/* ———————————————————————————————————————————————————————————————————————————————— *
 *    _____     ______   ______     __     __   __     __     ______   __  __       *
 *   /\  __-.  /\__  _\ /\  == \   /\ \   /\ "-.\ \   /\ \   /\__  _\ /\ \_\ \      *
 *   \ \ \/\ \ \/_/\ \/ \ \  __<   \ \ \  \ \ \-.  \  \ \ \  \/_/\ \/ \ \____ \     *
 *    \ \____-    \ \_\  \ \_\ \_\  \ \_\  \ \_\\"\_\  \ \_\    \ \_\  \/\_____\    *
 *     \/____/     \/_/   \/_/ /_/   \/_/   \/_/ \/_/   \/_/     \/_/   \/_____/    *
 *                                                                                  *
 * ————————————————————————————————— dtrinity.org ————————————————————————————————— *
 *                                                                                  *
 *                                         ▲                                        *
 *                                        ▲ ▲                                       *
 *                                                                                  *
 * ———————————————————————————————————————————————————————————————————————————————— *
 * dTRINITY Protocol: https://github.com/dtrinity                                   *
 * ———————————————————————————————————————————————————————————————————————————————— */

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:
     * 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 `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
    );
}

// SPDX-License-Identifier: GPL-3.0
/* ———————————————————————————————————————————————————————————————————————————————— *
 *    _____     ______   ______     __     __   __     __     ______   __  __       *
 *   /\  __-.  /\__  _\ /\  == \   /\ \   /\ "-.\ \   /\ \   /\__  _\ /\ \_\ \      *
 *   \ \ \/\ \ \/_/\ \/ \ \  __<   \ \ \  \ \ \-.  \  \ \ \  \/_/\ \/ \ \____ \     *
 *    \ \____-    \ \_\  \ \_\ \_\  \ \_\  \ \_\\"\_\  \ \_\    \ \_\  \/\_____\    *
 *     \/____/     \/_/   \/_/ /_/   \/_/   \/_/ \/_/   \/_/     \/_/   \/_____/    *
 *                                                                                  *
 * ————————————————————————————————— dtrinity.org ————————————————————————————————— *
 *                                                                                  *
 *                                         ▲                                        *
 *                                        ▲ ▲                                       *
 *                                                                                  *
 * ———————————————————————————————————————————————————————————————————————————————— *
 * dTRINITY Protocol: https://github.com/dtrinity                                   *
 * ———————————————————————————————————————————————————————————————————————————————— */

pragma solidity ^0.8.10;

import {IERC20} from "contracts/lending/core/dependencies/openzeppelin/contracts/IERC20.sol";
import {IAdminControlledEcosystemReserve} from "./interfaces/IAdminControlledEcosystemReserve.sol";
import {VersionedInitializable} from "./libs/VersionedInitializable.sol";
import {SafeERC20} from "./libs/SafeERC20.sol";
import {ReentrancyGuard} from "./libs/ReentrancyGuard.sol";
import {Address} from "./libs/Address.sol";

/**
 * @title AdminControlledEcosystemReserve
 * @notice Stores ERC20 tokens, and allows to dispose of them via approval or transfer dynamics
 * Adapted to be an implementation of a transparent proxy
 * @dev Done abstract to add an `initialize()` function on the child, with `initializer` modifier
 * @author BGD Labs
 **/
abstract contract AdminControlledEcosystemReserve is
    VersionedInitializable,
    IAdminControlledEcosystemReserve
{
    using SafeERC20 for IERC20;
    using Address for address payable;

    address internal _fundsAdmin;

    uint256 public constant REVISION = 1;

    /// @inheritdoc IAdminControlledEcosystemReserve
    address public constant ETH_MOCK_ADDRESS =
        0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;

    modifier onlyFundsAdmin() {
        require(msg.sender == _fundsAdmin, "ONLY_BY_FUNDS_ADMIN");
        _;
    }

    function getRevision() internal pure override returns (uint256) {
        return REVISION;
    }

    /// @inheritdoc IAdminControlledEcosystemReserve
    function getFundsAdmin() external view returns (address) {
        return _fundsAdmin;
    }

    /// @inheritdoc IAdminControlledEcosystemReserve
    function approve(
        IERC20 token,
        address recipient,
        uint256 amount
    ) external onlyFundsAdmin {
        token.safeApprove(recipient, amount);
    }

    /// @inheritdoc IAdminControlledEcosystemReserve
    function transfer(
        IERC20 token,
        address recipient,
        uint256 amount
    ) external onlyFundsAdmin {
        require(recipient != address(0), "INVALID_0X_RECIPIENT");

        if (address(token) == ETH_MOCK_ADDRESS) {
            payable(recipient).sendValue(amount);
        } else {
            token.safeTransfer(recipient, amount);
        }
    }

    /// @dev needed in order to receive ETH from the Aave v1 ecosystem reserve
    receive() external payable {}

    function _setFundsAdmin(address admin) internal {
        _fundsAdmin = admin;
        emit NewFundsAdmin(admin);
    }
}

// SPDX-License-Identifier: GPL-3.0
/* ———————————————————————————————————————————————————————————————————————————————— *
 *    _____     ______   ______     __     __   __     __     ______   __  __       *
 *   /\  __-.  /\__  _\ /\  == \   /\ \   /\ "-.\ \   /\ \   /\__  _\ /\ \_\ \      *
 *   \ \ \/\ \ \/_/\ \/ \ \  __<   \ \ \  \ \ \-.  \  \ \ \  \/_/\ \/ \ \____ \     *
 *    \ \____-    \ \_\  \ \_\ \_\  \ \_\  \ \_\\"\_\  \ \_\    \ \_\  \/\_____\    *
 *     \/____/     \/_/   \/_/ /_/   \/_/   \/_/ \/_/   \/_/     \/_/   \/_____/    *
 *                                                                                  *
 * ————————————————————————————————— dtrinity.org ————————————————————————————————— *
 *                                                                                  *
 *                                         ▲                                        *
 *                                        ▲ ▲                                       *
 *                                                                                  *
 * ———————————————————————————————————————————————————————————————————————————————— *
 * dTRINITY Protocol: https://github.com/dtrinity                                   *
 * ———————————————————————————————————————————————————————————————————————————————— */

pragma solidity ^0.8.10;

import {IERC20} from "contracts/lending/core/dependencies/openzeppelin/contracts/IERC20.sol";

interface IAdminControlledEcosystemReserve {
    /** @notice Emitted when the funds admin changes
     * @param fundsAdmin The new funds admin
     **/
    event NewFundsAdmin(address indexed fundsAdmin);

    /** @notice Returns the mock ETH reference address
     * @return address The address
     **/
    function ETH_MOCK_ADDRESS() external pure returns (address);

    /**
     * @notice Return the funds admin, only entity to be able to interact with this contract (controller of reserve)
     * @return address The address of the funds admin
     **/
    function getFundsAdmin() external view returns (address);

    /**
     * @dev Function for the funds admin to give ERC20 allowance to other parties
     * @param token The address of the token to give allowance from
     * @param recipient Allowance's recipient
     * @param amount Allowance to approve
     **/
    function approve(IERC20 token, address recipient, uint256 amount) external;

    /**
     * @notice Function for the funds admin to transfer ERC20 tokens to other parties
     * @param token The address of the token to transfer
     * @param recipient Transfer's recipient
     * @param amount Amount to transfer
     **/
    function transfer(IERC20 token, address recipient, uint256 amount) external;
}

// SPDX-License-Identifier: MIT
/* ———————————————————————————————————————————————————————————————————————————————— *
 *    _____     ______   ______     __     __   __     __     ______   __  __       *
 *   /\  __-.  /\__  _\ /\  == \   /\ \   /\ "-.\ \   /\ \   /\__  _\ /\ \_\ \      *
 *   \ \ \/\ \ \/_/\ \/ \ \  __<   \ \ \  \ \ \-.  \  \ \ \  \/_/\ \/ \ \____ \     *
 *    \ \____-    \ \_\  \ \_\ \_\  \ \_\  \ \_\\"\_\  \ \_\    \ \_\  \/\_____\    *
 *     \/____/     \/_/   \/_/ /_/   \/_/   \/_/ \/_/   \/_/     \/_/   \/_____/    *
 *                                                                                  *
 * ————————————————————————————————— dtrinity.org ————————————————————————————————— *
 *                                                                                  *
 *                                         ▲                                        *
 *                                        ▲ ▲                                       *
 *                                                                                  *
 * ———————————————————————————————————————————————————————————————————————————————— *
 * dTRINITY Protocol: https://github.com/dtrinity                                   *
 * ———————————————————————————————————————————————————————————————————————————————— */

pragma solidity ^0.8.10;

interface IStreamable {
    struct Stream {
        uint256 deposit;
        uint256 ratePerSecond;
        uint256 remainingBalance;
        uint256 startTime;
        uint256 stopTime;
        address recipient;
        address sender;
        address tokenAddress;
        bool isEntity;
    }

    event CreateStream(
        uint256 indexed streamId,
        address indexed sender,
        address indexed recipient,
        uint256 deposit,
        address tokenAddress,
        uint256 startTime,
        uint256 stopTime
    );

    event WithdrawFromStream(
        uint256 indexed streamId,
        address indexed recipient,
        uint256 amount
    );

    event CancelStream(
        uint256 indexed streamId,
        address indexed sender,
        address indexed recipient,
        uint256 senderBalance,
        uint256 recipientBalance
    );

    function balanceOf(
        uint256 streamId,
        address who
    ) external view returns (uint256 balance);

    function getStream(
        uint256 streamId
    )
        external
        view
        returns (
            address sender,
            address recipient,
            uint256 deposit,
            address token,
            uint256 startTime,
            uint256 stopTime,
            uint256 remainingBalance,
            uint256 ratePerSecond
        );

    function createStream(
        address recipient,
        uint256 deposit,
        address tokenAddress,
        uint256 startTime,
        uint256 stopTime
    ) external returns (uint256 streamId);

    function withdrawFromStream(
        uint256 streamId,
        uint256 funds
    ) external returns (bool);

    function cancelStream(uint256 streamId) external returns (bool);

    function initialize(address fundsAdmin) external;
}

// SPDX-License-Identifier: MIT
/* ———————————————————————————————————————————————————————————————————————————————— *
 *    _____     ______   ______     __     __   __     __     ______   __  __       *
 *   /\  __-.  /\__  _\ /\  == \   /\ \   /\ "-.\ \   /\ \   /\__  _\ /\ \_\ \      *
 *   \ \ \/\ \ \/_/\ \/ \ \  __<   \ \ \  \ \ \-.  \  \ \ \  \/_/\ \/ \ \____ \     *
 *    \ \____-    \ \_\  \ \_\ \_\  \ \_\  \ \_\\"\_\  \ \_\    \ \_\  \/\_____\    *
 *     \/____/     \/_/   \/_/ /_/   \/_/   \/_/ \/_/   \/_/     \/_/   \/_____/    *
 *                                                                                  *
 * ————————————————————————————————— dtrinity.org ————————————————————————————————— *
 *                                                                                  *
 *                                         ▲                                        *
 *                                        ▲ ▲                                       *
 *                                                                                  *
 * ———————————————————————————————————————————————————————————————————————————————— *
 * dTRINITY Protocol: https://github.com/dtrinity                                   *
 * ———————————————————————————————————————————————————————————————————————————————— */

// OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @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
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] 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.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-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 https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`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);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal 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);
            }
        }
    }
}

// SPDX-License-Identifier: MIT
/* ———————————————————————————————————————————————————————————————————————————————— *
 *    _____     ______   ______     __     __   __     __     ______   __  __       *
 *   /\  __-.  /\__  _\ /\  == \   /\ \   /\ "-.\ \   /\ \   /\__  _\ /\ \_\ \      *
 *   \ \ \/\ \ \/_/\ \/ \ \  __<   \ \ \  \ \ \-.  \  \ \ \  \/_/\ \/ \ \____ \     *
 *    \ \____-    \ \_\  \ \_\ \_\  \ \_\  \ \_\\"\_\  \ \_\    \ \_\  \/\_____\    *
 *     \/____/     \/_/   \/_/ /_/   \/_/   \/_/ \/_/   \/_/     \/_/   \/_____/    *
 *                                                                                  *
 * ————————————————————————————————— dtrinity.org ————————————————————————————————— *
 *                                                                                  *
 *                                         ▲                                        *
 *                                        ▲ ▲                                       *
 *                                                                                  *
 * ———————————————————————————————————————————————————————————————————————————————— *
 * dTRINITY Protocol: https://github.com/dtrinity                                   *
 * ———————————————————————————————————————————————————————————————————————————————— */

// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)

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
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy 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 making 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
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

// SPDX-License-Identifier: MIT
/* ———————————————————————————————————————————————————————————————————————————————— *
 *    _____     ______   ______     __     __   __     __     ______   __  __       *
 *   /\  __-.  /\__  _\ /\  == \   /\ \   /\ "-.\ \   /\ \   /\__  _\ /\ \_\ \      *
 *   \ \ \/\ \ \/_/\ \/ \ \  __<   \ \ \  \ \ \-.  \  \ \ \  \/_/\ \/ \ \____ \     *
 *    \ \____-    \ \_\  \ \_\ \_\  \ \_\  \ \_\\"\_\  \ \_\    \ \_\  \/\_____\    *
 *     \/____/     \/_/   \/_/ /_/   \/_/   \/_/ \/_/   \/_/     \/_/   \/_____/    *
 *                                                                                  *
 * ————————————————————————————————— dtrinity.org ————————————————————————————————— *
 *                                                                                  *
 *                                         ▲                                        *
 *                                        ▲ ▲                                       *
 *                                                                                  *
 * ———————————————————————————————————————————————————————————————————————————————— *
 * dTRINITY Protocol: https://github.com/dtrinity                                   *
 * ———————————————————————————————————————————————————————————————————————————————— */

// OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import {IERC20} from "contracts/lending/core/dependencies/openzeppelin/contracts/IERC20.sol";
import {Address} from "./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"
            );
        }
    }
}

// SPDX-License-Identifier: MIT
/* ———————————————————————————————————————————————————————————————————————————————— *
 *    _____     ______   ______     __     __   __     __     ______   __  __       *
 *   /\  __-.  /\__  _\ /\  == \   /\ \   /\ "-.\ \   /\ \   /\__  _\ /\ \_\ \      *
 *   \ \ \/\ \ \/_/\ \/ \ \  __<   \ \ \  \ \ \-.  \  \ \ \  \/_/\ \/ \ \____ \     *
 *    \ \____-    \ \_\  \ \_\ \_\  \ \_\  \ \_\\"\_\  \ \_\    \ \_\  \/\_____\    *
 *     \/____/     \/_/   \/_/ /_/   \/_/   \/_/ \/_/   \/_/     \/_/   \/_____/    *
 *                                                                                  *
 * ————————————————————————————————— dtrinity.org ————————————————————————————————— *
 *                                                                                  *
 *                                         ▲                                        *
 *                                        ▲ ▲                                       *
 *                                                                                  *
 * ———————————————————————————————————————————————————————————————————————————————— *
 * dTRINITY Protocol: https://github.com/dtrinity                                   *
 * ———————————————————————————————————————————————————————————————————————————————— */

pragma solidity ^0.8.10;

/**
 * @title VersionedInitializable
 *
 * @dev Helper contract to support initializer functions. To use it, replace
 * the constructor with a function that has the `initializer` modifier.
 * WARNING: Unlike constructors, initializer functions must be manually
 * invoked. This applies both to deploying an Initializable contract, as well
 * as extending an Initializable contract via inheritance.
 * WARNING: When used with inheritance, manual care must be taken to not invoke
 * a parent initializer twice, or ensure that all initializers are idempotent,
 * because this is not dealt with automatically as with constructors.
 *
 * @author Aave, inspired by the OpenZeppelin Initializable contract
 */
abstract contract VersionedInitializable {
    /**
     * @dev Indicates that the contract has been initialized.
     */
    uint256 internal lastInitializedRevision = 0;

    /**
     * @dev Modifier to use in the initializer function of a contract.
     */
    modifier initializer() {
        uint256 revision = getRevision();
        require(
            revision > lastInitializedRevision,
            "Contract instance has already been initialized"
        );

        lastInitializedRevision = revision;

        _;
    }

    /// @dev returns the revision number of the contract.
    /// Needs to be defined in the inherited class as a constant.
    function getRevision() internal pure virtual returns (uint256);

    // Reserved storage space to allow for layout changes in the future.
    uint256[50] private ______gap;
}

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

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[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"streamId","type":"uint256"},{"indexed":true,"internalType":"address","name":"sender","type":"address"},{"indexed":true,"internalType":"address","name":"recipient","type":"address"},{"indexed":false,"internalType":"uint256","name":"senderBalance","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"recipientBalance","type":"uint256"}],"name":"CancelStream","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"streamId","type":"uint256"},{"indexed":true,"internalType":"address","name":"sender","type":"address"},{"indexed":true,"internalType":"address","name":"recipient","type":"address"},{"indexed":false,"internalType":"uint256","name":"deposit","type":"uint256"},{"indexed":false,"internalType":"address","name":"tokenAddress","type":"address"},{"indexed":false,"internalType":"uint256","name":"startTime","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"stopTime","type":"uint256"}],"name":"CreateStream","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"fundsAdmin","type":"address"}],"name":"NewFundsAdmin","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"streamId","type":"uint256"},{"indexed":true,"internalType":"address","name":"recipient","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"WithdrawFromStream","type":"event"},{"inputs":[],"name":"ETH_MOCK_ADDRESS","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"REVISION","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract IERC20","name":"token","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approve","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"streamId","type":"uint256"},{"internalType":"address","name":"who","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"balance","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"streamId","type":"uint256"}],"name":"cancelStream","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"deposit","type":"uint256"},{"internalType":"address","name":"tokenAddress","type":"address"},{"internalType":"uint256","name":"startTime","type":"uint256"},{"internalType":"uint256","name":"stopTime","type":"uint256"}],"name":"createStream","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"streamId","type":"uint256"}],"name":"deltaOf","outputs":[{"internalType":"uint256","name":"delta","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getFundsAdmin","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getNextStreamId","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"streamId","type":"uint256"}],"name":"getStream","outputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"deposit","type":"uint256"},{"internalType":"address","name":"tokenAddress","type":"address"},{"internalType":"uint256","name":"startTime","type":"uint256"},{"internalType":"uint256","name":"stopTime","type":"uint256"},{"internalType":"uint256","name":"remainingBalance","type":"uint256"},{"internalType":"uint256","name":"ratePerSecond","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"fundsAdmin","type":"address"}],"name":"initialize","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract IERC20","name":"token","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"streamId","type":"uint256"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"withdrawFromStream","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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