Contract

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import {IERC20} from 'solidity-utils/contracts/oz-common/interfaces/IERC20.sol';
import {SafeERC20} from 'solidity-utils/contracts/oz-common/SafeERC20.sol';
import {Address} from 'solidity-utils/contracts/oz-common/Address.sol';
import {ICollector} from '../interfaces/ICollector.sol';
import {VersionedInitializable} from '../libs/VersionedInitializable.sol';
import {ReentrancyGuard} from '../libs/ReentrancyGuard.sol';

/**
 * @title Collector
 * @notice Stores ERC20 tokens of an ecosystem reserve and allows to dispose of them via approval
 * or transfer dynamics or 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 Collector is VersionedInitializable, ICollector, ReentrancyGuard {
  using SafeERC20 for IERC20;
  using Address for address payable;

  /*** Storage Properties ***/

  /**
   * @notice Address of the current funds admin.
   */
  address internal _fundsAdmin;

  /**
   * @notice Current revision of the contract.
   */
  uint256 public constant REVISION = 5;

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

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

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

  /*** Modifiers ***/

  /**
   * @dev Throws if the caller is not the funds admin.
   */
  modifier onlyFundsAdmin() {
    require(msg.sender == _fundsAdmin, 'ONLY_BY_FUNDS_ADMIN');
    _;
  }

  /**
   * @dev Throws if the caller is not the funds admin of the recipient of the stream.
   * @param streamId The id of the stream to query.
   */
  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 */

  /// @inheritdoc ICollector
  function initialize(address fundsAdmin, uint256 nextStreamId) external initializer {
    if (nextStreamId != 0) {
      _nextStreamId = nextStreamId;
    }

    // can be removed after first deployment
    _initGuard();
    _setFundsAdmin(fundsAdmin);
  }

  /*** View Functions ***/

  /// @inheritdoc VersionedInitializable
  function getRevision() internal pure override returns (uint256) {
    return REVISION;
  }

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

  /// @inheritdoc ICollector
  function getNextStreamId() external view returns (uint256) {
    return _nextStreamId;
  }

  /// @inheritdoc ICollector
  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;
  }

  /// @inheritdoc ICollector
  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 ***/

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

  /// @inheritdoc ICollector
  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 {}

  /// @inheritdoc ICollector
  function setFundsAdmin(address admin) external onlyFundsAdmin {
    _setFundsAdmin(admin);
  }

  /**
   * @dev Transfer the ownership of the funds administrator role.
   * @param admin The address of the new funds administrator
   */
  function _setFundsAdmin(address admin) internal {
    _fundsAdmin = admin;
    emit NewFundsAdmin(admin);
  }

  struct CreateStreamLocalVars {
    uint256 duration;
    uint256 ratePerSecond;
  }

  /// @inheritdoc ICollector
  /**
   * @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.
   */
  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;
  }

  /// @inheritdoc ICollector
  /**
   * @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.
   */
  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;
  }

  /// @inheritdoc ICollector
  /**
   * @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.
   */
  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: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Address.sol)
// From commit https://github.com/OpenZeppelin/openzeppelin-contracts/commit/8b778fa20d6d76340c5fac1ed66c80273f05b95a

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 functionCallWithValue(target, data, 0, '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');
    (bool success, bytes memory returndata) = target.call{value: value}(data);
    return verifyCallResultFromTarget(target, 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) {
    (bool success, bytes memory returndata) = target.staticcall(data);
    return verifyCallResultFromTarget(target, 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) {
    (bool success, bytes memory returndata) = target.delegatecall(data);
    return verifyCallResultFromTarget(target, success, returndata, errorMessage);
  }

  /**
   * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
   * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
   *
   * _Available since v4.8._
   */
  function verifyCallResultFromTarget(
    address target,
    bool success,
    bytes memory returndata,
    string memory errorMessage
  ) internal view returns (bytes memory) {
    if (success) {
      if (returndata.length == 0) {
        // only check isContract if the call was successful and the return data is empty
        // otherwise we already know that it was a contract
        require(isContract(target), 'Address: call to non-contract');
      }
      return returndata;
    } else {
      _revert(returndata, errorMessage);
    }
  }

  /**
   * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
   * revert reason or 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 {
      _revert(returndata, errorMessage);
    }
  }

  function _revert(bytes memory returndata, string memory errorMessage) private pure {
    // 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
      /// @solidity memory-safe-assembly
      assembly {
        let returndata_size := mload(returndata)
        revert(add(32, returndata), returndata_size)
      }
    } else {
      revert(errorMessage);
    }
  }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/utils/SafeERC20.sol)
// From commit https://github.com/OpenZeppelin/openzeppelin-contracts/commit/3dac7bbed7b4c0dbf504180c33e8ed8e350b93eb

pragma solidity ^0.8.0;

import "./interfaces/IERC20.sol";
import "./interfaces/draft-IERC20Permit.sol";
import "./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));
        }
    }

    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @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
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)
// From commit https://github.com/OpenZeppelin/openzeppelin-contracts/commit/a035b235b4f2c9af4ba88edc4447f02e37f8d124

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)
// From commit https://github.com/OpenZeppelin/openzeppelin-contracts/commit/6bd6b76d1156e20e45d1016f355d154141c7e5b9

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import {IERC20} from 'solidity-utils/contracts/oz-common/interfaces/IERC20.sol';

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

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

  /** @notice Emitted when the new stream is created
   * @param streamId The identifier of the stream.
   * @param sender The address of the collector.
   * @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.
   **/
  event CreateStream(
    uint256 indexed streamId,
    address indexed sender,
    address indexed recipient,
    uint256 deposit,
    address tokenAddress,
    uint256 startTime,
    uint256 stopTime
  );

  /**
   * @notice Emmitted when withdraw happens from the contract to the recipient's account.
   * @param streamId The id of the stream to withdraw tokens from.
   * @param recipient The address towards which the money is streamed.
   * @param amount The amount of tokens to withdraw.
   */
  event WithdrawFromStream(uint256 indexed streamId, address indexed recipient, uint256 amount);

  /**
   * @notice Emmitted when the stream is canceled.
   * @param streamId The id of the stream to withdraw tokens from.
   * @param sender The address of the collector.
   * @param recipient The address towards which the money is streamed.
   * @param senderBalance The sender's balance at the moment of cancelling.
   * @param recipientBalance The recipient's balance at the moment of cancelling.
   */
  event CancelStream(
    uint256 indexed streamId,
    address indexed sender,
    address indexed recipient,
    uint256 senderBalance,
    uint256 recipientBalance
  );

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

  /** @notice Initializes the contracts
   * @param fundsAdmin Funds admin address
   * @param nextStreamId StreamId to set, applied if greater than 0
   **/
  function initialize(address fundsAdmin, uint256 nextStreamId) external;

  /**
   * @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);

  /**
   * @notice Returns the available funds for the given stream id and address.
   * @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) external view returns (uint256 balance);

  /**
   * @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;

  /**
   * @dev Transfer the ownership of the funds administrator role.
          This function should only be callable by the current funds administrator.
   * @param admin The address of the new funds administrator
   */
  function setFundsAdmin(address admin) external;

  /**
   * @notice Creates a new stream funded by this contracts itself and paid towards `recipient`.
   * @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.
   * @return streamId the uint256 id of the newly created stream.
   */
  function createStream(
    address recipient,
    uint256 deposit,
    address tokenAddress,
    uint256 startTime,
    uint256 stopTime
  ) external returns (uint256 streamId);

  /**
   * @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
    returns (
      address sender,
      address recipient,
      uint256 deposit,
      address tokenAddress,
      uint256 startTime,
      uint256 stopTime,
      uint256 remainingBalance,
      uint256 ratePerSecond
    );

  /**
   * @notice Withdraws from the contract to the recipient's account.
   * @param streamId The id of the stream to withdraw tokens from.
   * @param amount The amount of tokens to withdraw.
   * @return bool Returns true if successful.
   */
  function withdrawFromStream(uint256 streamId, uint256 amount) external returns (bool);

  /**
   * @notice Cancels the stream and transfers the tokens back on a pro rata basis.
   * @param streamId The id of the stream to cancel.
   * @return bool Returns true if successful.
   */
  function cancelStream(uint256 streamId) external returns (bool);

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

// SPDX-License-Identifier: MIT
// 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;
  }

  /**
   * @dev As we use the guard with the proxy we need to init it with the empty value
   */
  function _initGuard() internal {
    _status = _NOT_ENTERED;
  }
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0;

/**
 * @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;
}

{
  "remappings": [
    "@aave/core-v2/=lib/protocol-v2/",
    "@aave/core-v3/=lib/aave-address-book/lib/aave-v3-core/",
    "@aave/periphery-v3/=lib/aave-address-book/lib/aave-v3-periphery/",
    "aave-address-book/=lib/aave-address-book/src/",
    "aave-helpers/=lib/aave-helpers/src/",
    "aave-v3-core/=lib/aave-address-book/lib/aave-v3-core/",
    "aave-v3-periphery/=lib/aave-address-book/lib/aave-v3-periphery/",
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "forge-std/=lib/forge-std/src/",
    "protocol-v2/=lib/protocol-v2/",
    "solidity-utils/=lib/solidity-utils/src/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "london",
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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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"},{"internalType":"uint256","name":"nextStreamId","type":"uint256"}],"name":"initialize","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"admin","type":"address"}],"name":"setFundsAdmin","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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