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

pragma solidity ^0.8.20;

import {IPullRewardsTransferStrategy} from "../interfaces/IPullRewardsTransferStrategy.sol";
import {ITransferStrategyBase} from "../interfaces/ITransferStrategyBase.sol";
import {TransferStrategyBase} from "./TransferStrategyBase.sol";
import {GPv2SafeERC20} from "contracts/dlend/core/dependencies/gnosis/contracts/GPv2SafeERC20.sol";
import {IERC20} from "contracts/dlend/core/dependencies/openzeppelin/contracts/IERC20.sol";

/**
 * @title PullRewardsTransferStrategy
 * @notice Transfer strategy that pulls ERC20 rewards from an external account to the user address.
 * The external account could be a smart contract or EOA that must approve to the PullRewardsTransferStrategy contract address.
 * @author Aave
 **/
contract PullRewardsTransferStrategy is
    TransferStrategyBase,
    IPullRewardsTransferStrategy
{
    using GPv2SafeERC20 for IERC20;

    address internal immutable REWARDS_VAULT;

    constructor(
        address incentivesController,
        address rewardsAdmin,
        address rewardsVault
    ) TransferStrategyBase(incentivesController, rewardsAdmin) {
        REWARDS_VAULT = rewardsVault;
    }

    /// @inheritdoc TransferStrategyBase
    function performTransfer(
        address to,
        address reward,
        uint256 amount
    )
        external
        override(TransferStrategyBase, ITransferStrategyBase)
        onlyIncentivesController
        returns (bool)
    {
        IERC20(reward).safeTransferFrom(REWARDS_VAULT, to, amount);

        return true;
    }

    /// @inheritdoc IPullRewardsTransferStrategy
    function getRewardsVault() external view returns (address) {
        return REWARDS_VAULT;
    }
}

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

pragma solidity ^0.8.20;

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

/// @title Gnosis Protocol v2 Safe ERC20 Transfer Library
/// @author Gnosis Developers
/// @dev Gas-efficient version of Openzeppelin's SafeERC20 contract.
library GPv2SafeERC20 {
    /// @dev Wrapper around a call to the ERC20 function `transfer` that reverts
    /// also when the token returns `false`.
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        bytes4 selector_ = token.transfer.selector;

        // solhint-disable-next-line no-inline-assembly
        assembly {
            let freeMemoryPointer := mload(0x40)
            mstore(freeMemoryPointer, selector_)
            mstore(
                add(freeMemoryPointer, 4),
                and(to, 0xffffffffffffffffffffffffffffffffffffffff)
            )
            mstore(add(freeMemoryPointer, 36), value)

            if iszero(call(gas(), token, 0, freeMemoryPointer, 68, 0, 0)) {
                returndatacopy(0, 0, returndatasize())
                revert(0, returndatasize())
            }
        }

        require(getLastTransferResult(token), "GPv2: failed transfer");
    }

    /// @dev Wrapper around a call to the ERC20 function `transferFrom` that
    /// reverts also when the token returns `false`.
    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        bytes4 selector_ = token.transferFrom.selector;

        // solhint-disable-next-line no-inline-assembly
        assembly {
            let freeMemoryPointer := mload(0x40)
            mstore(freeMemoryPointer, selector_)
            mstore(
                add(freeMemoryPointer, 4),
                and(from, 0xffffffffffffffffffffffffffffffffffffffff)
            )
            mstore(
                add(freeMemoryPointer, 36),
                and(to, 0xffffffffffffffffffffffffffffffffffffffff)
            )
            mstore(add(freeMemoryPointer, 68), value)

            if iszero(call(gas(), token, 0, freeMemoryPointer, 100, 0, 0)) {
                returndatacopy(0, 0, returndatasize())
                revert(0, returndatasize())
            }
        }

        require(getLastTransferResult(token), "GPv2: failed transferFrom");
    }

    /// @dev Verifies that the last return was a successful `transfer*` call.
    /// This is done by checking that the return data is either empty, or
    /// is a valid ABI encoded boolean.
    function getLastTransferResult(
        IERC20 token
    ) private view returns (bool success) {
        // NOTE: Inspecting previous return data requires assembly. Note that
        // we write the return data to memory 0 in the case where the return
        // data size is 32, this is OK since the first 64 bytes of memory are
        // reserved by Solidy as a scratch space that can be used within
        // assembly blocks.
        // <https://docs.soliditylang.org/en/v0.7.6/internals/layout_in_memory.html>
        // solhint-disable-next-line no-inline-assembly
        assembly {
            /// @dev Revert with an ABI encoded Solidity error with a message
            /// that fits into 32-bytes.
            ///
            /// An ABI encoded Solidity error has the following memory layout:
            ///
            /// ------------+----------------------------------
            ///  byte range | value
            /// ------------+----------------------------------
            ///  0x00..0x04 |        selector("Error(string)")
            ///  0x04..0x24 |      string offset (always 0x20)
            ///  0x24..0x44 |                    string length
            ///  0x44..0x64 | string value, padded to 32-bytes
            function revertWithMessage(length, message) {
                mstore(0x00, "\x08\xc3\x79\xa0")
                mstore(0x04, 0x20)
                mstore(0x24, length)
                mstore(0x44, message)
                revert(0x00, 0x64)
            }

            switch returndatasize()
            // Non-standard ERC20 transfer without return.
            case 0 {
                // NOTE: When the return data size is 0, verify that there
                // is code at the address. This is done in order to maintain
                // compatibility with Solidity calling conventions.
                // <https://docs.soliditylang.org/en/v0.7.6/control-structures.html#external-function-calls>
                if iszero(extcodesize(token)) {
                    revertWithMessage(20, "GPv2: not a contract")
                }

                success := 1
            }
            // Standard ERC20 transfer returning boolean success value.
            case 32 {
                returndatacopy(0, 0, returndatasize())

                // NOTE: For ABI encoding v1, any non-zero value is accepted
                // as `true` for a boolean. In order to stay compatible with
                // OpenZeppelin's `SafeERC20` library which is known to work
                // with the existing ERC20 implementation we care about,
                // make sure we return success for any non-zero return value
                // from the `transfer*` call.
                success := iszero(iszero(mload(0)))
            }
            default {
                revertWithMessage(31, "GPv2: malformed transfer result")
            }
        }
    }
}

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

pragma solidity ^0.8.20;

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

pragma solidity ^0.8.20;

import {ITransferStrategyBase} from "./ITransferStrategyBase.sol";

/**
 * @title IPullRewardsTransferStrategy
 * @author Aave
 **/
interface IPullRewardsTransferStrategy is ITransferStrategyBase {
    /**
     * @return Address of the rewards vault
     */
    function getRewardsVault() external view returns (address);
}

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

pragma solidity ^0.8.20;

interface ITransferStrategyBase {
    event EmergencyWithdrawal(
        address indexed caller,
        address indexed token,
        address indexed to,
        uint256 amount
    );

    /**
     * @dev Perform custom transfer logic via delegate call from source contract to a TransferStrategy implementation
     * @param to Account to transfer rewards
     * @param reward Address of the reward token
     * @param amount Amount to transfer to the "to" address parameter
     * @return Returns true bool if transfer logic succeeds
     */
    function performTransfer(
        address to,
        address reward,
        uint256 amount
    ) external returns (bool);

    /**
     * @return Returns the address of the Incentives Controller
     */
    function getIncentivesController() external view returns (address);

    /**
     * @return Returns the address of the Rewards admin
     */
    function getRewardsAdmin() external view returns (address);

    /**
     * @dev Perform an emergency token withdrawal only callable by the Rewards admin
     * @param token Address of the token to withdraw funds from this contract
     * @param to Address of the recipient of the withdrawal
     * @param amount Amount of the withdrawal
     */
    function emergencyWithdrawal(
        address token,
        address to,
        uint256 amount
    ) external;
}

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

pragma solidity ^0.8.20;

import {ITransferStrategyBase} from "../interfaces/ITransferStrategyBase.sol";
import {GPv2SafeERC20} from "contracts/dlend/core/dependencies/gnosis/contracts/GPv2SafeERC20.sol";
import {IERC20} from "contracts/dlend/core/dependencies/openzeppelin/contracts/IERC20.sol";

/**
 * @title TransferStrategyStorage
 * @author Aave
 **/
abstract contract TransferStrategyBase is ITransferStrategyBase {
    using GPv2SafeERC20 for IERC20;

    address internal immutable INCENTIVES_CONTROLLER;
    address internal immutable REWARDS_ADMIN;

    constructor(address incentivesController, address rewardsAdmin) {
        INCENTIVES_CONTROLLER = incentivesController;
        REWARDS_ADMIN = rewardsAdmin;
    }

    /**
     * @dev Modifier for incentives controller only functions
     */
    modifier onlyIncentivesController() {
        require(
            INCENTIVES_CONTROLLER == msg.sender,
            "CALLER_NOT_INCENTIVES_CONTROLLER"
        );
        _;
    }

    /**
     * @dev Modifier for reward admin only functions
     */
    modifier onlyRewardsAdmin() {
        require(msg.sender == REWARDS_ADMIN, "ONLY_REWARDS_ADMIN");
        _;
    }

    /// @inheritdoc ITransferStrategyBase
    function getIncentivesController()
        external
        view
        override
        returns (address)
    {
        return INCENTIVES_CONTROLLER;
    }

    /// @inheritdoc ITransferStrategyBase
    function getRewardsAdmin() external view override returns (address) {
        return REWARDS_ADMIN;
    }

    /// @inheritdoc ITransferStrategyBase
    function performTransfer(
        address to,
        address reward,
        uint256 amount
    ) external virtual returns (bool);

    /// @inheritdoc ITransferStrategyBase
    function emergencyWithdrawal(
        address token,
        address to,
        uint256 amount
    ) external onlyRewardsAdmin {
        IERC20(token).safeTransfer(to, amount);

        emit EmergencyWithdrawal(msg.sender, token, to, amount);
    }
}

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

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"incentivesController","type":"address"},{"internalType":"address","name":"rewardsAdmin","type":"address"},{"internalType":"address","name":"rewardsVault","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"caller","type":"address"},{"indexed":true,"internalType":"address","name":"token","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"EmergencyWithdrawal","type":"event"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"emergencyWithdrawal","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"getIncentivesController","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getRewardsAdmin","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getRewardsVault","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"address","name":"reward","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"performTransfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}]

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