Contract Library is the blockchain sleuth's favorite tool chest, allowing developers to easily debug, monitor, query, and analyze any deployed smart contract and its actions.

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acceptOwnership

_signer

addAllowedReservationSigner

grantId

receiver

root

nullifierHash

proof

checkClaim

timestamp

signature

checkClaimReserved

claim

claimReserved

grant

groupId

holder

nullifierHashes

owner

pendingOwner

removeAllowedReservationSigner

renounceOwnership

_grant

setGrant

_groupId

setGroupId

_holder

setHolder

_token

setToken

_worldIdRouter

setWorldIdRouter

token

newOwner

transferOwnership

worldIdRouter

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

interface IGrant {
    /// @notice Error in case the grant is invalid.
    error InvalidGrant();

    /// @notice Error in case the grant configuration is invalid.
    error InvalidConfiguration();

    /// @notice Returns the current grant id.
    function getCurrentId() external view returns (uint256);

    /// @notice Returns the amount of tokens for a grant.
    /// @notice This may contain more complicated logic and is therefore not just a member variable.
    /// @param grantId The grant id to get the amount for.
    function getAmount(uint256 grantId) external view returns (uint256);

    /// @notice Checks whether a grant is valid.
    /// @param grantId The grant id to check.
    function checkValidity(uint256 grantId) external view;

    /// @notice Calculates the grant id for a given timestamp.
    /// @param timestamp The timestamp to calculate the grant id for.
    function calculateId(uint256 timestamp) external view returns (uint256);

    /// @notice Checks whether a reservation is valid.
    /// @param timestamp The timestamp to check the reservation for.
    function checkReservationValidity(uint256 timestamp) external view;
}


src/IGrant.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

import {Ownable} from "openzeppelin-contracts/contracts/access/Ownable.sol";
import {Ownable2Step} from "openzeppelin-contracts/contracts/access/Ownable2Step.sol";
import {SafeERC20} from "openzeppelin-contracts/contracts/token/ERC20/utils/SafeERC20.sol";
import {ERC20} from "openzeppelin-contracts/contracts/token/ERC20/ERC20.sol";
import {IGrant} from './IGrant.sol';
import {IWorldIDGroups} from "world-id-contracts/interfaces/IWorldIDGroups.sol";
import {ECDSA} from "openzeppelin-contracts/contracts/utils/cryptography/ECDSA.sol";

/// @title RecurringGrantDrop
/// @author Worldcoin
contract RecurringGrantDrop is Ownable2Step{
    ///////////////////////////////////////////////////////////////////////////////
    ///                              CONFIG STORAGE                            ///
    //////////////////////////////////////////////////////////////////////////////

    /// @dev The WorldID router instance that will be used for managing groups and verifying proofs
    IWorldIDGroups public worldIdRouter;

    /// @dev The World ID group whose participants can claim this airdrop
    uint256 public groupId;

    /// @notice The ERC20 token airdropped
    ERC20 public token;

    /// @notice The address that holds the tokens that are being airdropped
    /// @dev Make sure the holder has approved spending for this contract!
    address public holder;

    /// @notice The grant instance used
    IGrant public grant;

    /// @dev Whether a nullifier hash has been used already. Used to prevent double-signaling
    mapping(uint256 => bool) public nullifierHashes;

    /// @dev Allowed addresses to sign a reservation
    mapping(address => bool) internal allowedSigners;

    ///////////////////////////////////////////////////////////////////////////////
    ///                                  ERRORS                                ///
    //////////////////////////////////////////////////////////////////////////////

    /// @notice Error in case the configuration is invalid.
    error InvalidConfiguration();

    /// @notice Error in case the receiver is zero address.
    error InvalidReceiver();

    /// @notice Error in case the receiver is zero address.
    error InvalidTimestamp();

    /// @notice Thrown when passed an invalid caller address
    error InvalidReservationSigner();

    /// @notice Thrown when passed an invalid caller address
    error UnauthorizedSigner();

    /// @notice Thrown when attempting to reuse a nullifier
    error InvalidNullifier();

    /// @notice Emmitted in revert if the owner attempts to resign ownership.
    error CannotRenounceOwnership();

    ///////////////////////////////////////////////////////////////////////////////
    ///                                  EVENTS                                ///
    //////////////////////////////////////////////////////////////////////////////

    /// @notice Emitted when a grant is successfully claimed
    /// @param _worldIdRouter The WorldID router that will manage groups and verify proofs
    /// @param _groupId The group ID of the World ID
    /// @param _token The ERC20 token that will be airdropped
    /// @param _holder The address holding the tokens that will be airdropped
    /// @param _grant The grant that contains the amounts and validity
    event RecurringGrantDropInitialized(IWorldIDGroups _worldIdRouter, uint256 _groupId, ERC20 _token, address _holder, IGrant _grant);

    /// @notice Emitted when a grant is successfully claimed
    /// @param receiver The address that received the tokens
    event GrantClaimed(uint256 grantId, address receiver);

    /// @notice Emitted when the worldIdRouter is changed
    /// @param worldIdRouter The new worldIdRouter instance
    event WorldIdRouterUpdated(IWorldIDGroups worldIdRouter);

    /// @notice Emitted when the groupId is changed
    /// @param groupId The new groupId
    event GroupIdUpdated(uint256 groupId);

    /// @notice Emitted when the token is changed
    /// @param token The new token
    event TokenUpdated(ERC20 token);

    /// @notice Emitted when the holder is changed
    /// @param holder The new holder
    event HolderUpdated(address holder);

    /// @notice Emitted when the grant is changed
    /// @param grant The new grant instance
    event GrantUpdated(IGrant grant);

    /// @notice Emitted when an allowed reservation signer is added
    /// @param signer The new signer
    event AllowedReservationSignerAdded(address signer);

    /// @notice Emitted when an allowed reservation signer is removed
    /// @param signer The new signer
    event AllowedReservationSignerRemoved(address signer);

    ///////////////////////////////////////////////////////////////////////////////
    ///                               CONSTRUCTOR                              ///
    //////////////////////////////////////////////////////////////////////////////

    /// @notice Deploys a WorldIDAirdrop instance
    /// @param _worldIdRouter The WorldID router that will manage groups and verify proofs
    /// @param _groupId The group ID of the World ID
    /// @param _token The ERC20 token that will be airdropped
    /// @param _holder The address holding the tokens that will be airdropped
    /// @param _grant The grant that contains the amounts and validity
    constructor(
        IWorldIDGroups _worldIdRouter,
        uint256 _groupId,
        ERC20 _token,
        address _holder,
        IGrant _grant
    ) Ownable(msg.sender) {
        if (address(_worldIdRouter) == address(0)) revert InvalidConfiguration();
        if (address(_token) == address(0)) revert InvalidConfiguration();
        if (address(_holder) == address(0)) revert InvalidConfiguration();
        if (address(_grant) == address(0)) revert InvalidConfiguration();

        worldIdRouter = _worldIdRouter;
        groupId = _groupId;
        token = _token;
        holder = _holder;
        grant = _grant;

        emit RecurringGrantDropInitialized(worldIdRouter, groupId, token, holder, grant);
    }

    ///////////////////////////////////////////////////////////////////////////////
    ///                               CLAIM LOGIC                               ///
    //////////////////////////////////////////////////////////////////////////////

    /// @notice Claim the airdrop
    /// @param grantId The grant ID to claim
    /// @param receiver The address that will receive the tokens (this is also the signal of the ZKP)
    /// @param root The root of the Merkle tree (signup-sequencer or world-id-contracts provides this)
    /// @param nullifierHash The nullifier for this proof, preventing double signaling
    /// @param proof The zero knowledge proof that demonstrates the claimer has a verified World ID
    /// @dev hashToField function docs are in lib/world-id-contracts/src/libraries/ByteHasher.sol
    function claim(uint256 grantId, address receiver, uint256 root, uint256 nullifierHash, uint256[8] calldata proof)
        external
    {
        checkClaim(grantId, receiver, root, nullifierHash, proof);

        nullifierHashes[nullifierHash] = true;

        SafeERC20.safeTransferFrom(token, holder, receiver, grant.getAmount(grantId));

        emit GrantClaimed(grantId, receiver);
    }

    /// @notice Check whether a claim is valid
    /// @param grantId The grant ID to claim
    /// @param receiver The address that will receive the tokens (this is also the signal of the ZKP)
    /// @param root The root of the Merkle tree (signup-sequencer or world-id-contracts provides this)
    /// @param nullifierHash The nullifier for this proof, preventing double signaling
    /// @param proof The zero knowledge proof that demonstrates the claimer has a verified World ID
    function checkClaim(uint256 grantId, address receiver, uint256 root, uint256 nullifierHash, uint256[8] calldata proof)
        public
    {
        if (receiver == address(0)) revert InvalidReceiver();

        if (nullifierHashes[nullifierHash]) revert InvalidNullifier();

        grant.checkValidity(grantId);

        worldIdRouter.verifyProof(
            root,
            groupId,
            uint256(keccak256(abi.encodePacked(receiver))) >> 8,
            nullifierHash,
            grantId,
            proof
        );
    }

    /// @notice Claim a reserved grant from the past
    /// @param timestamp The timestamp of the reservation
    /// @param receiver The address that will receive the tokens (this is also the signal of the ZKP)
    /// @param root The root of the Merkle tree (signup-sequencer or world-id-contracts provides this)
    /// @param nullifierHash The nullifier for this proof, preventing double signaling
    /// @param proof The zero knowledge proof that demonstrates the claimer has a verified World ID
    /// @param signature The signature of the reservation
    function claimReserved(uint256 timestamp, address receiver, uint256 root, uint256 nullifierHash, uint256[8] calldata proof, bytes calldata signature)
        external
    {
        uint256 grantId = grant.calculateId(timestamp);
        checkClaimReserved(timestamp, receiver, root, nullifierHash, proof, signature);

        nullifierHashes[nullifierHash] = true;

        SafeERC20.safeTransferFrom(token, holder, receiver, grant.getAmount(grantId));

        emit GrantClaimed(grantId, receiver);
    }

    /// @notice Check whether a reservation is valid
    /// @param timestamp The timestamp of the reservation
    /// @param receiver The address that will receive the tokens (this is also the signal of the ZKP)
    /// @param root The root of the Merkle tree (signup-sequencer or world-id-contracts provides this)
    /// @param nullifierHash The nullifier for this proof, preventing double signaling
    /// @param proof The zero knowledge proof, array of 8 uint256 elements, demonstrating that the claimer has a verified World ID
    /// @param signature The off-chain signature of the reservation.
    function checkClaimReserved(uint256 timestamp, address receiver, uint256 root, uint256 nullifierHash, uint256[8] calldata proof, bytes calldata signature)
        public
    {
        uint256 grantId = grant.calculateId(timestamp);

        if (receiver == address(0)) revert InvalidReceiver();
        if (timestamp > block.timestamp) revert InvalidTimestamp();

        if (nullifierHashes[nullifierHash]) revert InvalidNullifier();

        grant.checkReservationValidity(timestamp);

        address signer = ECDSA.recover(keccak256(abi.encode(timestamp, nullifierHash)), signature);
        if (!allowedSigners[signer]) revert UnauthorizedSigner();

        worldIdRouter.verifyProof(
            root,
            groupId,
            uint256(keccak256(abi.encodePacked(receiver))) >> 8,
            nullifierHash,
            grantId,
            proof
        );
    }

    ///////////////////////////////////////////////////////////////////////////////
    ///                               CONFIG LOGIC                             ///
    //////////////////////////////////////////////////////////////////////////////

    /// @notice Add a caller to the list of allowed callers
    /// @param _signer The address to add
    function addAllowedReservationSigner(address _signer) external onlyOwner {
        if (_signer == address(0)) revert InvalidReservationSigner();
        allowedSigners[_signer] = true;
        
        emit AllowedReservationSignerAdded(_signer);
    }

    /// @notice Remove a signer to the list of allowed signers
    /// @param _signer The address to remove
    function removeAllowedReservationSigner(address _signer) external onlyOwner {
        if (_signer == address(0)) revert InvalidReservationSigner();
        allowedSigners[_signer] = false;

        emit AllowedReservationSignerRemoved(_signer);
    }

    /// @notice Update the worldIdRouter
    /// @param _worldIdRouter The new worldIdRouter
    function setWorldIdRouter(IWorldIDGroups _worldIdRouter) external onlyOwner {
        if (address(_worldIdRouter) == address(0)) revert InvalidConfiguration();

        worldIdRouter = _worldIdRouter;
        emit WorldIdRouterUpdated(_worldIdRouter);
    }

    /// @notice Update the groupId
    /// @param _groupId The new worldIdRouter
    function setGroupId(uint256 _groupId) external onlyOwner {
        groupId = _groupId;

        emit GroupIdUpdated(_groupId);
    }

    /// @notice Update the token
    /// @param _token The new token
    function setToken(ERC20 _token) external onlyOwner {
        if (address(_token) == address(0)) revert InvalidConfiguration();
        token = _token;
        
        emit TokenUpdated(_token);
    }

    /// @notice Update the holder
    /// @param _holder The new holder
    function setHolder(address _holder) external onlyOwner {
        if (address(_holder) == address(0)) revert InvalidConfiguration();
        holder = _holder;
        
        emit HolderUpdated(holder);
    }

    /// @notice Update the grant
    /// @param _grant The new grant
    function setGrant(IGrant _grant) external onlyOwner {
        if (address(_grant) == address(0)) revert InvalidConfiguration();

        grant = _grant;
        emit GrantUpdated(_grant);
    }

    /// @notice Prevents the owner from renouncing ownership
    /// @dev onlyOwner
    function renounceOwnership() public view override onlyOwner {
        revert CannotRenounceOwnership();
    }
}


src/RecurringGrantDrop.sol

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)

pragma solidity ^0.8.19;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev The ETH balance of the account is not enough to perform the operation.
     */
    error AddressInsufficientBalance(address account);

    /**
     * @dev There's no code at `target` (it is not a contract).
     */
    error AddressEmptyCode(address target);

    /**
     * @dev A call to an address target failed. The target may have reverted.
     */
    error FailedInnerCall();

    /**
     * @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://consensys.net/diligence/blog/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/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        if (address(this).balance < amount) {
            revert AddressInsufficientBalance(address(this));
        }

        (bool success, ) = recipient.call{value: amount}("");
        if (!success) {
            revert FailedInnerCall();
        }
    }

    /**
     * @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.
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, defaultRevert);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with a
     * `customRevert` function as a fallback when `target` reverts.
     *
     * Requirements:
     *
     * - `customRevert` must be a reverting function.
     */
    function functionCall(
        address target,
        bytes memory data,
        function() internal view customRevert
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, customRevert);
    }

    /**
     * @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`.
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, defaultRevert);
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with a `customRevert` function as a fallback revert reason when `target` reverts.
     *
     * Requirements:
     *
     * - `customRevert` must be a reverting function.
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        function() internal view customRevert
    ) internal returns (bytes memory) {
        if (address(this).balance < value) {
            revert AddressInsufficientBalance(address(this));
        }
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, customRevert);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, defaultRevert);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        function() internal view customRevert
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, customRevert);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, defaultRevert);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        function() internal view customRevert
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, customRevert);
    }

    /**
     * @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 `customRevert`) in case of unsuccessful call or if target was not a contract.
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        function() internal view customRevert
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check if target is a contract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                if (target.code.length == 0) {
                    revert AddressEmptyCode(target);
                }
            }
            return returndata;
        } else {
            _revert(returndata, customRevert);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or with a default revert error.
     */
    function verifyCallResult(bool success, bytes memory returndata) internal view returns (bytes memory) {
        return verifyCallResult(success, returndata, defaultRevert);
    }

    /**
     * @dev Same as {xref-Address-verifyCallResult-bool-bytes-}[`verifyCallResult`], but with a
     * `customRevert` function as a fallback when `success` is `false`.
     *
     * Requirements:
     *
     * - `customRevert` must be a reverting function.
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        function() internal view customRevert
    ) internal view returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, customRevert);
        }
    }

    /**
     * @dev Default reverting function when no `customRevert` is provided in a function call.
     */
    function defaultRevert() internal pure {
        revert FailedInnerCall();
    }

    function _revert(bytes memory returndata, function() internal view customRevert) private view {
        // 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 {
            customRevert();
            revert FailedInnerCall();
        }
    }
}


lib/openzeppelin-contracts/contracts/utils/Address.sol

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

pragma solidity ^0.8.19;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}


lib/openzeppelin-contracts/contracts/utils/Context.sol

//SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

/// @title Base WorldID interface
/// @author Worldcoin
/// @notice The interface providing basic types across various WorldID contracts.
interface IBaseWorldID {
    ///////////////////////////////////////////////////////////////////////////////
    ///                                  ERRORS                                 ///
    ///////////////////////////////////////////////////////////////////////////////

    /// @notice Thrown when attempting to validate a root that has expired.
    error ExpiredRoot();

    /// @notice Thrown when attempting to validate a root that has yet to be added to the root
    ///         history.
    error NonExistentRoot();
}


lib/world-id-contracts/src/interfaces/IBaseWorldID.sol

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity ^0.8.19;

import {Context} from "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * The initial owner is set to the address provided by the deployer. This can
 * later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    constructor(address initialOwner) {
        _transferOwnership(initialOwner);
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        if (newOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}


lib/openzeppelin-contracts/contracts/access/Ownable.sol

//SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

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

/// @title WorldID Interface with Groups
/// @author Worldcoin
/// @notice The interface to the proof verification for WorldID.
interface IWorldIDGroups is IBaseWorldID {
    /// @notice Verifies a WorldID zero knowledge proof.
    /// @dev Note that a double-signaling check is not included here, and should be carried by the
    ///      caller.
    /// @dev It is highly recommended that the implementation is restricted to `view` if possible.
    ///
    /// @param groupId The group identifier for the group to verify a proof for.
    /// @param root The of the Merkle tree
    /// @param signalHash A keccak256 hash of the Semaphore signal
    /// @param nullifierHash The nullifier hash
    /// @param externalNullifierHash A keccak256 hash of the external nullifier
    /// @param proof The zero-knowledge proof
    ///
    /// @custom:reverts string If the `proof` is invalid.
    /// @custom:reverts NoSuchGroup If the provided `groupId` references a group that does not exist.
    function verifyProof(
        uint256 root,
        uint256 groupId,
        uint256 signalHash,
        uint256 nullifierHash,
        uint256 externalNullifierHash,
        uint256[8] calldata proof
    ) external;
}


lib/world-id-contracts/src/interfaces/IWorldIDGroups.sol

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.19;

import {IERC20} from "./IERC20.sol";
import {IERC20Metadata} from "./extensions/IERC20Metadata.sol";
import {Context} from "../../utils/Context.sol";
import {IERC20Errors} from "../../interfaces/draft-IERC6093.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * The default value of {decimals} is 18. To change this, you should override
 * this function so it returns a different value.
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
abstract contract ERC20 is Context, IERC20, IERC20Metadata, IERC20Errors {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Indicates a failed `decreaseAllowance` request.
     */
    error ERC20FailedDecreaseAllowance(address spender, uint256 currentAllowance, uint256 requestedDecrease);

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the default value returned by this function, unless
     * it's overridden.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `value`.
     */
    function transfer(address to, uint256 value) public virtual returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, value);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `value` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 value) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, value);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `value`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `value`.
     */
    function transferFrom(address from, address to, uint256 value) public virtual returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, value);
        _transfer(from, to, value);
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `requestedDecrease`.
     *
     * NOTE: Although this function is designed to avoid double spending with {approval},
     * it can still be frontrunned, preventing any attempt of allowance reduction.
     */
    function decreaseAllowance(address spender, uint256 requestedDecrease) public virtual returns (bool) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance < requestedDecrease) {
            revert ERC20FailedDecreaseAllowance(spender, currentAllowance, requestedDecrease);
        }
        unchecked {
            _approve(owner, spender, currentAllowance - requestedDecrease);
        }

        return true;
    }

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * NOTE: This function is not virtual, {_update} should be overridden instead.
     */
    function _transfer(address from, address to, uint256 value) internal {
        if (from == address(0)) {
            revert ERC20InvalidSender(address(0));
        }
        if (to == address(0)) {
            revert ERC20InvalidReceiver(address(0));
        }
        _update(from, to, value);
    }

    /**
     * @dev Transfers a `value` amount of tokens from `from` to `to`, or alternatively mints (or burns) if `from` (or `to`) is
     * the zero address. All customizations to transfers, mints, and burns should be done by overriding this function.
     *
     * Emits a {Transfer} event.
     */
    function _update(address from, address to, uint256 value) internal virtual {
        if (from == address(0)) {
            // Overflow check required: The rest of the code assumes that totalSupply never overflows
            _totalSupply += value;
        } else {
            uint256 fromBalance = _balances[from];
            if (fromBalance < value) {
                revert ERC20InsufficientBalance(from, fromBalance, value);
            }
            unchecked {
                // Overflow not possible: value <= fromBalance <= totalSupply.
                _balances[from] = fromBalance - value;
            }
        }

        if (to == address(0)) {
            unchecked {
                // Overflow not possible: value <= totalSupply or value <= fromBalance <= totalSupply.
                _totalSupply -= value;
            }
        } else {
            unchecked {
                // Overflow not possible: balance + value is at most totalSupply, which we know fits into a uint256.
                _balances[to] += value;
            }
        }

        emit Transfer(from, to, value);
    }

    /**
     * @dev Creates a `value` amount of tokens and assigns them to `account`, by transferring it from address(0).
     * Relies on the `_update` mechanism
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * NOTE: This function is not virtual, {_update} should be overridden instead.
     */
    function _mint(address account, uint256 value) internal {
        if (account == address(0)) {
            revert ERC20InvalidReceiver(address(0));
        }
        _update(address(0), account, value);
    }

    /**
     * @dev Destroys a `value` amount of tokens from `account`, by transferring it to address(0).
     * Relies on the `_update` mechanism.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * NOTE: This function is not virtual, {_update} should be overridden instead
     */
    function _burn(address account, uint256 value) internal {
        if (account == address(0)) {
            revert ERC20InvalidSender(address(0));
        }
        _update(account, address(0), value);
    }

    /**
     * @dev Sets `value` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 value) internal virtual {
        _approve(owner, spender, value, true);
    }

    /**
     * @dev Alternative version of {_approve} with an optional flag that can enable or disable the Approval event.
     *
     * By default (when calling {_approve}) the flag is set to true. On the other hand, approval changes made by
     * `_spendAllowance` during the `transferFrom` operation set the flag to false. This saves gas by not emitting any
     * `Approval` event during `transferFrom` operations.
     *
     * Anyone who wishes to continue emitting `Approval` events on the`transferFrom` operation can force the flag to true
     * using the following override:
     * ```
     * function _approve(address owner, address spender, uint256 value, bool) internal virtual override {
     *     super._approve(owner, spender, value, true);
     * }
     * ```
     *
     * Requirements are the same as {_approve}.
     */
    function _approve(address owner, address spender, uint256 value, bool emitEvent) internal virtual {
        if (owner == address(0)) {
            revert ERC20InvalidApprover(address(0));
        }
        if (spender == address(0)) {
            revert ERC20InvalidSpender(address(0));
        }
        _allowances[owner][spender] = value;
        if (emitEvent) {
            emit Approval(owner, spender, value);
        }
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `value`.
     *
     * Does not update the allowance value in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(address owner, address spender, uint256 value) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            if (currentAllowance < value) {
                revert ERC20InsufficientAllowance(spender, currentAllowance, value);
            }
            unchecked {
                _approve(owner, spender, currentAllowance - value, false);
            }
        }
    }
}


lib/openzeppelin-contracts/contracts/token/ERC20/ERC20.sol

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.19;

/**
 * @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);
}


lib/openzeppelin-contracts/contracts/token/ERC20/IERC20.sol

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable2Step.sol)

pragma solidity ^0.8.19;

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

/**
 * @dev Contract module which provides access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * The initial owner is specified at deployment time in the constructor for `Ownable`. This
 * can later be changed with {transferOwnership} and {acceptOwnership}.
 *
 * This module is used through inheritance. It will make available all functions
 * from parent (Ownable).
 */
abstract contract Ownable2Step is Ownable {
    address private _pendingOwner;

    event OwnershipTransferStarted(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Returns the address of the pending owner.
     */
    function pendingOwner() public view virtual returns (address) {
        return _pendingOwner;
    }

    /**
     * @dev Starts the ownership transfer of the contract to a new account. Replaces the pending transfer if there is one.
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual override onlyOwner {
        _pendingOwner = newOwner;
        emit OwnershipTransferStarted(owner(), newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`) and deletes any pending owner.
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual override {
        delete _pendingOwner;
        super._transferOwnership(newOwner);
    }

    /**
     * @dev The new owner accepts the ownership transfer.
     */
    function acceptOwnership() public virtual {
        address sender = _msgSender();
        if (pendingOwner() != sender) {
            revert OwnableUnauthorizedAccount(sender);
        }
        _transferOwnership(sender);
    }
}


lib/openzeppelin-contracts/contracts/access/Ownable2Step.sol

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/cryptography/ECDSA.sol)

pragma solidity ^0.8.19;

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
    enum RecoverError {
        NoError,
        InvalidSignature,
        InvalidSignatureLength,
        InvalidSignatureS
    }

    /**
     * @dev The signature derives the `address(0)`.
     */
    error ECDSAInvalidSignature();

    /**
     * @dev The signature has an invalid length.
     */
    error ECDSAInvalidSignatureLength(uint256 length);

    /**
     * @dev The signature has an S value that is in the upper half order.
     */
    error ECDSAInvalidSignatureS(bytes32 s);

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature` or error string. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM precompile allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {MessageHashUtils-toEthSignedMessageHash} on it.
     *
     * Documentation for signature generation:
     * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
     * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
     */
    function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError, bytes32) {
        if (signature.length == 65) {
            bytes32 r;
            bytes32 s;
            uint8 v;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            /// @solidity memory-safe-assembly
            assembly {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
            return tryRecover(hash, v, r, s);
        } else {
            return (address(0), RecoverError.InvalidSignatureLength, bytes32(signature.length));
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM precompile allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {MessageHashUtils-toEthSignedMessageHash} on it.
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        (address recovered, RecoverError error, bytes32 errorArg) = tryRecover(hash, signature);
        _throwError(error, errorArg);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
     *
     * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
     */
    function tryRecover(bytes32 hash, bytes32 r, bytes32 vs) internal pure returns (address, RecoverError, bytes32) {
        unchecked {
            bytes32 s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);
            // We do not check for an overflow here since the shift operation results in 0 or 1.
            uint8 v = uint8((uint256(vs) >> 255) + 27);
            return tryRecover(hash, v, r, s);
        }
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
     */
    function recover(bytes32 hash, bytes32 r, bytes32 vs) internal pure returns (address) {
        (address recovered, RecoverError error, bytes32 errorArg) = tryRecover(hash, r, vs);
        _throwError(error, errorArg);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function tryRecover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address, RecoverError, bytes32) {
        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
            return (address(0), RecoverError.InvalidSignatureS, s);
        }

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        if (signer == address(0)) {
            return (address(0), RecoverError.InvalidSignature, bytes32(0));
        }

        return (signer, RecoverError.NoError, bytes32(0));
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function recover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) internal pure returns (address) {
        (address recovered, RecoverError error, bytes32 errorArg) = tryRecover(hash, v, r, s);
        _throwError(error, errorArg);
        return recovered;
    }

    /**
     * @dev Optionally reverts with the corresponding custom error according to the `error` argument provided.
     */
    function _throwError(RecoverError error, bytes32 errorArg) private pure {
        if (error == RecoverError.NoError) {
            return; // no error: do nothing
        } else if (error == RecoverError.InvalidSignature) {
            revert ECDSAInvalidSignature();
        } else if (error == RecoverError.InvalidSignatureLength) {
            revert ECDSAInvalidSignatureLength(uint256(errorArg));
        } else if (error == RecoverError.InvalidSignatureS) {
            revert ECDSAInvalidSignatureS(errorArg);
        }
    }
}


lib/openzeppelin-contracts/contracts/utils/cryptography/ECDSA.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

/**
 * @dev Standard ERC20 Errors
 * Interface of the ERC6093 custom errors for ERC20 tokens
 * as defined in https://eips.ethereum.org/EIPS/eip-6093
 */
interface IERC20Errors {
    /**
     * @dev Indicates an error related to the current `balance` of a `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     * @param balance Current balance for the interacting account.
     * @param needed Minimum amount required to perform a transfer.
     */
    error ERC20InsufficientBalance(address sender, uint256 balance, uint256 needed);

    /**
     * @dev Indicates a failure with the token `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     */
    error ERC20InvalidSender(address sender);

    /**
     * @dev Indicates a failure with the token `receiver`. Used in transfers.
     * @param receiver Address to which tokens are being transferred.
     */
    error ERC20InvalidReceiver(address receiver);

    /**
     * @dev Indicates a failure with the `spender`’s `allowance`. Used in transfers.
     * @param spender Address that may be allowed to operate on tokens without being their owner.
     * @param allowance Amount of tokens a `spender` is allowed to operate with.
     * @param needed Minimum amount required to perform a transfer.
     */
    error ERC20InsufficientAllowance(address spender, uint256 allowance, uint256 needed);

    /**
     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.
     * @param approver Address initiating an approval operation.
     */
    error ERC20InvalidApprover(address approver);

    /**
     * @dev Indicates a failure with the `spender` to be approved. Used in approvals.
     * @param spender Address that may be allowed to operate on tokens without being their owner.
     */
    error ERC20InvalidSpender(address spender);
}

/**
 * @dev Standard ERC721 Errors
 * Interface of the ERC6093 custom errors for ERC721 tokens
 * as defined in https://eips.ethereum.org/EIPS/eip-6093
 */
interface IERC721Errors {
    /**
     * @dev Indicates that an address can't be an owner. For example, `address(0)` is a forbidden owner in EIP-20.
     * Used in balance queries.
     * @param owner Address of the current owner of a token.
     */
    error ERC721InvalidOwner(address owner);

    /**
     * @dev Indicates a `tokenId` whose `owner` is the zero address.
     * @param tokenId Identifier number of a token.
     */
    error ERC721NonexistentToken(uint256 tokenId);

    /**
     * @dev Indicates an error related to the ownership over a particular token. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     * @param tokenId Identifier number of a token.
     * @param owner Address of the current owner of a token.
     */
    error ERC721IncorrectOwner(address sender, uint256 tokenId, address owner);

    /**
     * @dev Indicates a failure with the token `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     */
    error ERC721InvalidSender(address sender);

    /**
     * @dev Indicates a failure with the token `receiver`. Used in transfers.
     * @param receiver Address to which tokens are being transferred.
     */
    error ERC721InvalidReceiver(address receiver);

    /**
     * @dev Indicates a failure with the `operator`’s approval. Used in transfers.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     * @param tokenId Identifier number of a token.
     */
    error ERC721InsufficientApproval(address operator, uint256 tokenId);

    /**
     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.
     * @param approver Address initiating an approval operation.
     */
    error ERC721InvalidApprover(address approver);

    /**
     * @dev Indicates a failure with the `operator` to be approved. Used in approvals.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     */
    error ERC721InvalidOperator(address operator);
}

/**
 * @dev Standard ERC1155 Errors
 * Interface of the ERC6093 custom errors for ERC1155 tokens
 * as defined in https://eips.ethereum.org/EIPS/eip-6093
 */
interface IERC1155Errors {
    /**
     * @dev Indicates an error related to the current `balance` of a `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     * @param balance Current balance for the interacting account.
     * @param needed Minimum amount required to perform a transfer.
     * @param tokenId Identifier number of a token.
     */
    error ERC1155InsufficientBalance(address sender, uint256 balance, uint256 needed, uint256 tokenId);

    /**
     * @dev Indicates a failure with the token `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     */
    error ERC1155InvalidSender(address sender);

    /**
     * @dev Indicates a failure with the token `receiver`. Used in transfers.
     * @param receiver Address to which tokens are being transferred.
     */
    error ERC1155InvalidReceiver(address receiver);

    /**
     * @dev Indicates a failure with the `operator`’s approval. Used in transfers.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     * @param owner Address of the current owner of a token.
     */
    error ERC1155MissingApprovalForAll(address operator, address owner);

    /**
     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.
     * @param approver Address initiating an approval operation.
     */
    error ERC1155InvalidApprover(address approver);

    /**
     * @dev Indicates a failure with the `operator` to be approved. Used in approvals.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     */
    error ERC1155InvalidOperator(address operator);

    /**
     * @dev Indicates an array length mismatch between ids and values in a safeBatchTransferFrom operation.
     * Used in batch transfers.
     * @param idsLength Length of the array of token identifiers
     * @param valuesLength Length of the array of token amounts
     */
    error ERC1155InvalidArrayLength(uint256 idsLength, uint256 valuesLength);
}


lib/openzeppelin-contracts/contracts/interfaces/draft-IERC6093.sol

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.19;

import {IERC20} from "../IERC20.sol";
import {IERC20Permit} from "../extensions/IERC20Permit.sol";
import {Address} from "../../../utils/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;

    /**
     * @dev An operation with an ERC20 token failed.
     */
    error SafeERC20FailedOperation(address token);

    /**
     * @dev Indicates a failed `decreaseAllowance` request.
     */
    error SafeERC20FailedDecreaseAllowance(address spender, uint256 currentAllowance, uint256 requestedDecrease);

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeCall(token.transfer, (to, value)));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeCall(token.transferFrom, (from, to, value)));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        forceApprove(token, spender, oldAllowance + value);
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `requestedDecrease`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 requestedDecrease) internal {
        unchecked {
            uint256 currentAllowance = token.allowance(address(this), spender);
            if (currentAllowance < requestedDecrease) {
                revert SafeERC20FailedDecreaseAllowance(spender, currentAllowance, requestedDecrease);
            }
            forceApprove(token, spender, currentAllowance - requestedDecrease);
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeCall(token.approve, (spender, value));

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeCall(token.approve, (spender, 0)));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
     * Revert on invalid signature.
     */
    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);
        if (nonceAfter != nonceBefore + 1) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @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);
        if (returndata.length != 0 && !abi.decode(returndata, (bool))) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @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).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        // 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 cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return success && (returndata.length == 0 || abi.decode(returndata, (bool))) && address(token).code.length > 0;
    }
}


lib/openzeppelin-contracts/contracts/token/ERC20/utils/SafeERC20.sol

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.19;

/**
 * @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);
}


lib/openzeppelin-contracts/contracts/token/ERC20/extensions/IERC20Permit.sol

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

pragma solidity ^0.8.19;

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

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}


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