Contract Source Code:

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity ^0.8.23;

import {DelegationSurrogate} from "./DelegationSurrogate.sol";
import {IERC20Delegates} from "./interfaces/IERC20Delegates.sol";

/// @title DelegationSurrogateVotes
/// @author [ScopeLift](https://scopelift.co)
/// @notice A dead-simple contract whose only purpose is to hold governance tokens on behalf of
/// users while delegating voting power to one specific delegatee. This is needed because a single
/// address can only delegate its (full) token weight to a single address at a time. Thus, when a
/// contract holds governance tokens in a pool on behalf of disparate token holders, those holders
/// are typically disenfranchised from their governance rights.
///
/// If a pool contract deploys a DelegationSurrogateVotes for each delegatee, and transfers each
/// depositor's tokens to the appropriate surrogate—or deploys it on their behalf—users can retain
/// their governance rights.
///
/// The pool contract deploying the surrogates must handle all accounting. The surrogate simply
/// delegates its voting weight and max-approves its deployer to allow tokens to be reclaimed.
contract DelegationSurrogateVotes is DelegationSurrogate {
  /// @param _token The governance token that will be held by this surrogate
  /// @param _delegatee The address of the would-be voter to which this surrogate will delegate its
  /// voting weight. 100% of all voting tokens held by this surrogate will be delegated to this
  /// address.
  constructor(IERC20Delegates _token, address _delegatee) DelegationSurrogate(_token) {
    _token.delegate(_delegatee);
  }
}

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity ^0.8.23;

import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";

/// @title DelegationSurrogate
/// @author [ScopeLift](https://scopelift.co)
/// @notice A dead-simple contract whose only purpose is to hold ERC20 tokens which can always be
/// moved by the Surrogate's deployer.
abstract contract DelegationSurrogate {
  /// @param _token The token that will be held by this surrogate.
  constructor(IERC20 _token) {
    _token.approve(msg.sender, type(uint256).max);
  }
}

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity ^0.8.23;

import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {IDelegates} from "./IDelegates.sol";

/// @notice A subset of the ERC20Votes-style governance token to which a staking token should
/// conform. Methods related to standard ERC20 functionality and to delegation are included.
/// These methods are needed in the context of this system. Methods related to checkpointing,
/// past voting weights, and other functionality are omitted.
interface IERC20Delegates is IERC20, IDelegates {}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @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 value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

    /**
     * @dev Moves a `value` amount of 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 value) 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 a `value` amount of tokens 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 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` 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 value) external returns (bool);
}

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity ^0.8.23;

/// @notice An interface that contains the necessary `IVotes` functions for the governance staking
/// system.
interface IDelegates {
  /// @notice Method which assigns voting weight from the sender to delegatee.
  function delegate(address _delegatee) external;

  /// @notice Method which returns the delegatee to which the account's voting weight is currently
  /// delegated.
  function delegates(address _account) external view returns (address);
}