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// SPDX-License-Identifier: MIT

pragma solidity 0.8.18;

import { Address } from "@openzeppelin/contracts/utils/Address.sol";

import { EMPTY_UID, EIP712Signature } from "./Types.sol";

// prettier-ignore
import {
    Attestation,
    AttestationRequest,
    AttestationRequestData,
    DelegatedAttestationRequest,
    DelegatedRevocationRequest,
    IEAS,
    MultiAttestationRequest,
    MultiDelegatedAttestationRequest,
    MultiDelegatedRevocationRequest,
    MultiRevocationRequest,
    RevocationRequest,
    RevocationRequestData
} from "./IEAS.sol";
import { ISchemaRegistry, SchemaRecord } from "./ISchemaRegistry.sol";
import { EIP712Verifier } from "./EIP712Verifier.sol";

import { ISchemaResolver } from "./resolver/ISchemaResolver.sol";

struct AttestationsResult {
    uint256 usedValue; // Total ETH amount that was sent to resolvers.
    bytes32[] uids; // UIDs of the new attestations.
}

/**
 * @title EAS - Ethereum Attestation Service
 */
contract EAS is IEAS, EIP712Verifier {
    using Address for address payable;

    error AccessDenied();
    error AlreadyRevoked();
    error AlreadyRevokedOffchain();
    error AlreadyTimestamped();
    error InsufficientValue();
    error InvalidAttestation();
    error InvalidAttestations();
    error InvalidExpirationTime();
    error InvalidLength();
    error InvalidOffset();
    error InvalidRegistry();
    error InvalidRevocation();
    error InvalidRevocations();
    error InvalidSchema();
    error InvalidVerifier();
    error Irrevocable();
    error NotFound();
    error NotPayable();
    error WrongSchema();

    // The version of the contract.
    string public constant VERSION = "0.26";

    // A zero expiration represents an non-expiring attestation.
    uint64 private constant NO_EXPIRATION_TIME = 0;

    // The global schema registry.
    ISchemaRegistry private immutable _schemaRegistry;

    // The global mapping between attestations and their UIDs.
    mapping(bytes32 uid => Attestation attestation) private _db;

    // The global mapping between data and their timestamps.
    mapping(bytes32 data => uint64 timestamp) private _timestamps;

    // The global mapping between data and their revocation timestamps.
    mapping(address revoker => mapping(bytes32 data => uint64 timestamp)) private _revocationsOffchain;

    /**
     * @dev Creates a new EAS instance.
     *
     * @param registry The address of the global schema registry.
     */
    constructor(ISchemaRegistry registry) EIP712Verifier(VERSION) {
        if (address(registry) == address(0)) {
            revert InvalidRegistry();
        }

        _schemaRegistry = registry;
    }

    /**
     * @inheritdoc IEAS
     */
    function getSchemaRegistry() external view returns (ISchemaRegistry) {
        return _schemaRegistry;
    }

    /**
     * @inheritdoc IEAS
     */
    function attest(AttestationRequest calldata request) public payable virtual returns (bytes32) {
        AttestationRequestData[] memory requests = new AttestationRequestData[](1);
        requests[0] = request.data;

        return _attest(request.schema, requests, msg.sender, msg.value, true).uids[0];
    }

    /**
     * @inheritdoc IEAS
     */
    function attestByDelegation(
        DelegatedAttestationRequest calldata delegatedRequest
    ) public payable virtual returns (bytes32) {
        _verifyAttest(delegatedRequest);

        AttestationRequestData[] memory data = new AttestationRequestData[](1);
        data[0] = delegatedRequest.data;

        return _attest(delegatedRequest.schema, data, delegatedRequest.attester, msg.value, true).uids[0];
    }

    /**
     * @inheritdoc IEAS
     */
    function multiAttest(MultiAttestationRequest[] calldata multiRequests) external payable returns (bytes32[] memory) {
        // Since a multi-attest call is going to make multiple attestations for multiple schemas, we'd need to collect
        // all the returned UIDs into a single list.
        bytes32[][] memory totalUids = new bytes32[][](multiRequests.length);
        uint256 totalUidsCount = 0;

        // We are keeping track of the total available ETH amount that can be sent to resolvers and will keep deducting
        // from it to verify that there isn't any attempt to send too much ETH to resolvers. Please note that unless
        // some ETH was stuck in the contract by accident (which shouldn't happen in normal conditions), it won't be
        // possible to send too much ETH anyway.
        uint availableValue = msg.value;

        for (uint256 i = 0; i < multiRequests.length; ) {
            // The last batch is handled slightly differently: if the total available ETH wasn't spent in full and there
            // is a remainder - it will be refunded back to the attester (something that we can only verify during the
            // last and final batch).
            bool last;
            unchecked {
                last = i == multiRequests.length - 1;
            }

            // Process the current batch of attestations.
            MultiAttestationRequest calldata multiRequest = multiRequests[i];
            AttestationsResult memory res = _attest(
                multiRequest.schema,
                multiRequest.data,
                msg.sender,
                availableValue,
                last
            );

            // Ensure to deduct the ETH that was forwarded to the resolver during the processing of this batch.
            availableValue -= res.usedValue;

            // Collect UIDs (and merge them later).
            totalUids[i] = res.uids;
            unchecked {
                totalUidsCount += res.uids.length;
            }

            unchecked {
                ++i;
            }
        }

        // Merge all the collected UIDs and return them as a flatten array.
        return _mergeUIDs(totalUids, totalUidsCount);
    }

    /**
     * @inheritdoc IEAS
     */
    function multiAttestByDelegation(
        MultiDelegatedAttestationRequest[] calldata multiDelegatedRequests
    ) external payable returns (bytes32[] memory) {
        // Since a multi-attest call is going to make multiple attestations for multiple schemas, we'd need to collect
        // all the returned UIDs into a single list.
        bytes32[][] memory totalUids = new bytes32[][](multiDelegatedRequests.length);
        uint256 totalUidsCount = 0;

        // We are keeping track of the total available ETH amount that can be sent to resolvers and will keep deducting
        // from it to verify that there isn't any attempt to send too much ETH to resolvers. Please note that unless
        // some ETH was stuck in the contract by accident (which shouldn't happen in normal conditions), it won't be
        // possible to send too much ETH anyway.
        uint availableValue = msg.value;

        for (uint256 i = 0; i < multiDelegatedRequests.length; ) {
            // The last batch is handled slightly differently: if the total available ETH wasn't spent in full and there
            // is a remainder - it will be refunded back to the attester (something that we can only verify during the
            // last and final batch).
            bool last;
            unchecked {
                last = i == multiDelegatedRequests.length - 1;
            }

            MultiDelegatedAttestationRequest calldata multiDelegatedRequest = multiDelegatedRequests[i];
            AttestationRequestData[] calldata data = multiDelegatedRequest.data;

            // Ensure that no inputs are missing.
            if (data.length == 0 || data.length != multiDelegatedRequest.signatures.length) {
                revert InvalidLength();
            }

            // Verify EIP712 signatures. Please note that the signatures are assumed to be signed with increasing nonces.
            for (uint256 j = 0; j < data.length; ) {
                _verifyAttest(
                    DelegatedAttestationRequest({
                        schema: multiDelegatedRequest.schema,
                        data: data[j],
                        signature: multiDelegatedRequest.signatures[j],
                        attester: multiDelegatedRequest.attester
                    })
                );

                unchecked {
                    ++j;
                }
            }

            // Process the current batch of attestations.
            AttestationsResult memory res = _attest(
                multiDelegatedRequest.schema,
                data,
                multiDelegatedRequest.attester,
                availableValue,
                last
            );

            // Ensure to deduct the ETH that was forwarded to the resolver during the processing of this batch.
            availableValue -= res.usedValue;

            // Collect UIDs (and merge them later).
            totalUids[i] = res.uids;
            unchecked {
                totalUidsCount += res.uids.length;
            }

            unchecked {
                ++i;
            }
        }

        // Merge all the collected UIDs and return them as a flatten array.
        return _mergeUIDs(totalUids, totalUidsCount);
    }

    /**
     * @inheritdoc IEAS
     */
    function revoke(RevocationRequest calldata request) public payable virtual {
        RevocationRequestData[] memory requests = new RevocationRequestData[](1);
        requests[0] = request.data;

        _revoke(request.schema, requests, msg.sender, msg.value, true);
    }

    /**
     * @inheritdoc IEAS
     */
    function revokeByDelegation(DelegatedRevocationRequest calldata delegatedRequest) public payable virtual {
        _verifyRevoke(delegatedRequest);

        RevocationRequestData[] memory data = new RevocationRequestData[](1);
        data[0] = delegatedRequest.data;

        _revoke(delegatedRequest.schema, data, delegatedRequest.revoker, msg.value, true);
    }

    /**
     * @inheritdoc IEAS
     */
    function multiRevoke(MultiRevocationRequest[] calldata multiRequests) external payable {
        // We are keeping track of the total available ETH amount that can be sent to resolvers and will keep deducting
        // from it to verify that there isn't any attempt to send too much ETH to resolvers. Please note that unless
        // some ETH was stuck in the contract by accident (which shouldn't happen in normal conditions), it won't be
        // possible to send too much ETH anyway.
        uint availableValue = msg.value;

        for (uint256 i = 0; i < multiRequests.length; ) {
            // The last batch is handled slightly differently: if the total available ETH wasn't spent in full and there
            // is a remainder - it will be refunded back to the attester (something that we can only verify during the
            // last and final batch).
            bool last;
            unchecked {
                last = i == multiRequests.length - 1;
            }

            MultiRevocationRequest calldata multiRequest = multiRequests[i];

            // Ensure to deduct the ETH that was forwarded to the resolver during the processing of this batch.
            availableValue -= _revoke(multiRequest.schema, multiRequest.data, msg.sender, availableValue, last);

            unchecked {
                ++i;
            }
        }
    }

    /**
     * @inheritdoc IEAS
     */
    function multiRevokeByDelegation(
        MultiDelegatedRevocationRequest[] calldata multiDelegatedRequests
    ) external payable {
        // We are keeping track of the total available ETH amount that can be sent to resolvers and will keep deducting
        // from it to verify that there isn't any attempt to send too much ETH to resolvers. Please note that unless
        // some ETH was stuck in the contract by accident (which shouldn't happen in normal conditions), it won't be
        // possible to send too much ETH anyway.
        uint availableValue = msg.value;

        for (uint256 i = 0; i < multiDelegatedRequests.length; ) {
            // The last batch is handled slightly differently: if the total available ETH wasn't spent in full and there
            // is a remainder - it will be refunded back to the attester (something that we can only verify during the
            // last and final batch).
            bool last;
            unchecked {
                last = i == multiDelegatedRequests.length - 1;
            }

            MultiDelegatedRevocationRequest memory multiDelegatedRequest = multiDelegatedRequests[i];
            RevocationRequestData[] memory data = multiDelegatedRequest.data;

            // Ensure that no inputs are missing.
            if (data.length == 0 || data.length != multiDelegatedRequest.signatures.length) {
                revert InvalidLength();
            }

            // Verify EIP712 signatures. Please note that the signatures are assumed to be signed with increasing nonces.
            for (uint256 j = 0; j < data.length; ) {
                _verifyRevoke(
                    DelegatedRevocationRequest({
                        schema: multiDelegatedRequest.schema,
                        data: data[j],
                        signature: multiDelegatedRequest.signatures[j],
                        revoker: multiDelegatedRequest.revoker
                    })
                );

                unchecked {
                    ++j;
                }
            }

            // Ensure to deduct the ETH that was forwarded to the resolver during the processing of this batch.
            availableValue -= _revoke(
                multiDelegatedRequest.schema,
                data,
                multiDelegatedRequest.revoker,
                availableValue,
                last
            );

            unchecked {
                ++i;
            }
        }
    }

    /**
     * @inheritdoc IEAS
     */
    function timestamp(bytes32 data) external returns (uint64) {
        uint64 time = _time();

        _timestamp(data, time);

        return time;
    }

    /**
     * @inheritdoc IEAS
     */
    function revokeOffchain(bytes32 data) external returns (uint64) {
        uint64 time = _time();

        _revokeOffchain(msg.sender, data, time);

        return time;
    }

    /**
     * @inheritdoc IEAS
     */
    function multiRevokeOffchain(bytes32[] calldata data) external returns (uint64) {
        uint64 time = _time();

        uint256 length = data.length;
        for (uint256 i = 0; i < length; ) {
            _revokeOffchain(msg.sender, data[i], time);

            unchecked {
                ++i;
            }
        }

        return time;
    }

    /**
     * @inheritdoc IEAS
     */
    function multiTimestamp(bytes32[] calldata data) external returns (uint64) {
        uint64 time = _time();

        uint256 length = data.length;
        for (uint256 i = 0; i < length; ) {
            _timestamp(data[i], time);

            unchecked {
                ++i;
            }
        }

        return time;
    }

    /**
     * @inheritdoc IEAS
     */
    function getAttestation(bytes32 uid) external view returns (Attestation memory) {
        return _db[uid];
    }

    /**
     * @inheritdoc IEAS
     */
    function isAttestationValid(bytes32 uid) public view returns (bool) {
        return _db[uid].uid != 0;
    }

    /**
     * @inheritdoc IEAS
     */
    function getTimestamp(bytes32 data) external view returns (uint64) {
        return _timestamps[data];
    }

    /**
      * @inheritdoc IEAS
      */
    function getRevokeOffchain(address revoker, bytes32 data) external view returns (uint64) {
        return _revocationsOffchain[revoker][data];
    }

    /**
     * @dev Attests to a specific schema.
     *
     * @param schema // the unique identifier of the schema to attest to.
     * @param data The arguments of the attestation requests.
     * @param attester The attesting account.
     * @param availableValue The total available ETH amount that can be sent to the resolver.
     * @param last Whether this is the last attestations/revocations set.
     *
     * @return The UID of the new attestations and the total sent ETH amount.
     */
    function _attest(
        bytes32 schema,
        AttestationRequestData[] memory data,
        address attester,
        uint256 availableValue,
        bool last
    ) private returns (AttestationsResult memory) {
        uint256 length = data.length;

        AttestationsResult memory res;
        res.uids = new bytes32[](length);

        // Ensure that we aren't attempting to attest to a non-existing schema.
        SchemaRecord memory schemaRecord = _schemaRegistry.getSchema(schema);
        if (schemaRecord.uid == EMPTY_UID) {
            revert InvalidSchema();
        }

        Attestation[] memory attestations = new Attestation[](length);
        uint256[] memory values = new uint256[](length);

        for (uint256 i = 0; i < length; ) {
            AttestationRequestData memory request = data[i];

            // Ensure that either no expiration time was set or that it was set in the future.
            if (request.expirationTime != NO_EXPIRATION_TIME && request.expirationTime <= _time()) {
                revert InvalidExpirationTime();
            }

            // Ensure that we aren't trying to make a revocable attestation for a non-revocable schema.
            if (!schemaRecord.revocable && request.revocable) {
                revert Irrevocable();
            }

            Attestation memory attestation = Attestation({
                uid: EMPTY_UID,
                schema: schema,
                refUID: request.refUID,
                time: _time(),
                expirationTime: request.expirationTime,
                revocationTime: 0,
                recipient: request.recipient,
                attester: attester,
                revocable: request.revocable,
                data: request.data
            });

            // Look for the first non-existing UID (and use a bump seed/nonce in the rare case of a conflict).
            bytes32 uid;
            uint32 bump = 0;
            while (true) {
                uid = _getUID(attestation, bump);
                if (_db[uid].uid == EMPTY_UID) {
                    break;
                }

                unchecked {
                    ++bump;
                }
            }
            attestation.uid = uid;

            _db[uid] = attestation;

            if (request.refUID != 0) {
                // Ensure that we aren't trying to attest to a non-existing referenced UID.
                if (!isAttestationValid(request.refUID)) {
                    revert NotFound();
                }
            }

            attestations[i] = attestation;
            values[i] = request.value;

            res.uids[i] = uid;

            emit Attested(request.recipient, attester, uid, schema);

            unchecked {
                ++i;
            }
        }

        res.usedValue = _resolveAttestations(schemaRecord, attestations, values, false, availableValue, last);

        return res;
    }

    /**
     * @dev Revokes an existing attestation to a specific schema.
     *
     * @param schema The unique identifier of the schema to attest to.
     * @param data The arguments of the revocation requests.
     * @param revoker The revoking account.
     * @param availableValue The total available ETH amount that can be sent to the resolver.
     * @param last Whether this is the last attestations/revocations set.
     *
     * @return Returns the total sent ETH amount.
     */
    function _revoke(
        bytes32 schema,
        RevocationRequestData[] memory data,
        address revoker,
        uint256 availableValue,
        bool last
    ) private returns (uint256) {
        // Ensure that a non-existing schema ID wasn't passed by accident.
        SchemaRecord memory schemaRecord = _schemaRegistry.getSchema(schema);
        if (schemaRecord.uid == EMPTY_UID) {
            revert InvalidSchema();
        }

        uint256 length = data.length;
        Attestation[] memory attestations = new Attestation[](length);
        uint256[] memory values = new uint256[](length);

        for (uint256 i = 0; i < length; ) {
            RevocationRequestData memory request = data[i];

            Attestation storage attestation = _db[request.uid];

            // Ensure that we aren't attempting to revoke a non-existing attestation.
            if (attestation.uid == EMPTY_UID) {
                revert NotFound();
            }

            // Ensure that a wrong schema ID wasn't passed by accident.
            if (attestation.schema != schema) {
                revert InvalidSchema();
            }

            // Allow only original attesters to revoke their attestations.
            if (attestation.attester != revoker) {
                revert AccessDenied();
            }

            // Please note that also checking of the schema itself is revocable is unnecessary, since it's not possible to
            // make revocable attestations to an irrevocable schema.
            if (!attestation.revocable) {
                revert Irrevocable();
            }

            // Ensure that we aren't trying to revoke the same attestation twice.
            if (attestation.revocationTime != 0) {
                revert AlreadyRevoked();
            }
            attestation.revocationTime = _time();

            attestations[i] = attestation;
            values[i] = request.value;

            emit Revoked(attestation.recipient, revoker, request.uid, attestation.schema);

            unchecked {
                ++i;
            }
        }

        return _resolveAttestations(schemaRecord, attestations, values, true, availableValue, last);
    }

    /**
     * @dev Resolves a new attestation or a revocation of an existing attestation.
     *
     * @param schemaRecord The schema of the attestation.
     * @param attestation The data of the attestation to make/revoke.
     * @param value An explicit ETH amount to send to the resolver.
     * @param isRevocation Whether to resolve an attestation or its revocation.
     * @param availableValue The total available ETH amount that can be sent to the resolver.
     * @param last Whether this is the last attestations/revocations set.
     *
     * @return Returns the total sent ETH amount.
     */
    function _resolveAttestation(
        SchemaRecord memory schemaRecord,
        Attestation memory attestation,
        uint256 value,
        bool isRevocation,
        uint256 availableValue,
        bool last
    ) private returns (uint256) {
        ISchemaResolver resolver = schemaRecord.resolver;
        if (address(resolver) == address(0)) {
            // Ensure that we don't accept payments if there is no resolver.
            if (value != 0) {
                revert NotPayable();
            }

            return 0;
        }

        // Ensure that we don't accept payments which can't be forwarded to the resolver.
        if (value != 0 && !resolver.isPayable()) {
            revert NotPayable();
        }

        // Ensure that the attester/revoker doesn't try to spend more than available.
        if (value > availableValue) {
            revert InsufficientValue();
        }

        // Ensure to deduct the sent value explicitly.
        unchecked {
            availableValue -= value;
        }

        if (isRevocation) {
            if (!resolver.revoke{ value: value }(attestation)) {
                revert InvalidRevocation();
            }
        } else if (!resolver.attest{ value: value }(attestation)) {
            revert InvalidAttestation();
        }

        if (last) {
            _refund(availableValue);
        }

        return value;
    }

    /**
     * @dev Resolves multiple attestations or revocations of existing attestations.
     *
     * @param schemaRecord The schema of the attestation.
     * @param attestations The data of the attestations to make/revoke.
     * @param values Explicit ETH amounts to send to the resolver.
     * @param isRevocation Whether to resolve an attestation or its revocation.
     * @param availableValue The total available ETH amount that can be sent to the resolver.
     * @param last Whether this is the last attestations/revocations set.
     *
     * @return Returns the total sent ETH amount.
     */
    function _resolveAttestations(
        SchemaRecord memory schemaRecord,
        Attestation[] memory attestations,
        uint256[] memory values,
        bool isRevocation,
        uint256 availableValue,
        bool last
    ) private returns (uint256) {
        uint256 length = attestations.length;
        if (length == 1) {
            return _resolveAttestation(schemaRecord, attestations[0], values[0], isRevocation, availableValue, last);
        }

        ISchemaResolver resolver = schemaRecord.resolver;
        if (address(resolver) == address(0)) {
            // Ensure that we don't accept payments if there is no resolver.
            for (uint256 i = 0; i < length; ) {
                if (values[i] != 0) {
                    revert NotPayable();
                }

                unchecked {
                    ++i;
                }
            }

            return 0;
        }

        uint256 totalUsedValue = 0;

        for (uint256 i = 0; i < length; ) {
            uint256 value = values[i];

            // Ensure that we don't accept payments which can't be forwarded to the resolver.
            if (value != 0 && !resolver.isPayable()) {
                revert NotPayable();
            }

            // Ensure that the attester/revoker doesn't try to spend more than available.
            if (value > availableValue) {
                revert InsufficientValue();
            }

            // Ensure to deduct the sent value explicitly and add it to the total used value by the batch.
            unchecked {
                availableValue -= value;
                totalUsedValue += value;

                ++i;
            }
        }

        if (isRevocation) {
            if (!resolver.multiRevoke{ value: totalUsedValue }(attestations, values)) {
                revert InvalidRevocations();
            }
        } else if (!resolver.multiAttest{ value: totalUsedValue }(attestations, values)) {
            revert InvalidAttestations();
        }

        if (last) {
            _refund(availableValue);
        }

        return totalUsedValue;
    }

    /**
     * @dev Calculates a UID for a given attestation.
     *
     * @param attestation The input attestation.
     * @param bump A bump value to use in case of a UID conflict.
     *
     * @return Attestation UID.
     */
    function _getUID(Attestation memory attestation, uint32 bump) private pure returns (bytes32) {
        return
            keccak256(
                abi.encodePacked(
                    attestation.schema,
                    attestation.recipient,
                    attestation.attester,
                    attestation.time,
                    attestation.expirationTime,
                    attestation.revocable,
                    attestation.refUID,
                    attestation.data,
                    bump
                )
            );
    }

    /**
     * @dev Refunds remaining ETH amount to the attester.
     *
     * @param remainingValue The remaining ETH amount that was not sent to the resolver.
     */
    function _refund(uint256 remainingValue) private {
        if (remainingValue > 0) {
            // Using a regular transfer here might revert, for some non-EOA attesters, due to exceeding of the 2300
            // gas limit which is why we're using call instead (via sendValue), which the 2300 gas limit does not
            // apply for.
            payable(msg.sender).sendValue(remainingValue);
        }
    }

    /**
     * @dev Merges lists of UIDs.
     *
     * @param uidLists The provided lists of UIDs.
     * @param uidsCount Total UIDs count.
     *
     * @return A merged and flatten list of all the UIDs.
     */
    function _mergeUIDs(bytes32[][] memory uidLists, uint256 uidsCount) private pure returns (bytes32[] memory) {
        bytes32[] memory uids = new bytes32[](uidsCount);

        uint256 currentIndex = 0;
        for (uint256 i = 0; i < uidLists.length; ) {
            bytes32[] memory currentUids = uidLists[i];
            for (uint256 j = 0; j < currentUids.length; ) {
                uids[currentIndex] = currentUids[j];

                unchecked {
                    ++j;
                    ++currentIndex;
                }
            }
            unchecked {
                ++i;
            }
        }

        return uids;
    }

    /**
     * @dev Timestamps the specified bytes32 data.
     *
     * @param data The data to timestamp.
     * @param time The timestamp.
     */
    function _timestamp(bytes32 data, uint64 time) private {
        if (_timestamps[data] != 0) {
            revert AlreadyTimestamped();
        }

        _timestamps[data] = time;

        emit Timestamped(data, time);
    }

    /**
         * @dev Timestamps the specified bytes32 data.
         *
         * @param data The data to timestamp.
         * @param time The timestamp.
         */
    function _revokeOffchain(address revoker, bytes32 data, uint64 time) private {
        mapping(bytes32 data => uint64 timestamp) storage revocations = _revocationsOffchain[revoker];


        if (revocations[data] != 0) {
            revert AlreadyRevokedOffchain();
        }

        revocations[data] = time;

        emit RevokedOffchain(revoker, data, time);
    }

    /**
     * @dev Returns the current's block timestamp. This method is overridden during tests and used to simulate the
     * current block time.
     */
    function _time() internal view virtual returns (uint64) {
        return uint64(block.timestamp);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.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}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * 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].
 *
 * 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}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * 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 override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override 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 value {ERC20} uses, unless this function is
     * 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 override returns (uint8) {
        return 18;
    }

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

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override 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 `amount`.
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, amount);
        return true;
    }

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

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `amount` 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 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        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 `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        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
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `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.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
            // decrementing then incrementing.
            _balances[to] += amount;
        }

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        unchecked {
            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
            _balances[account] += amount;
        }
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
            // Overflow not possible: amount <= accountBalance <= totalSupply.
            _totalSupply -= amount;
        }

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` 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 amount
    ) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)

pragma solidity ^0.8.0;

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

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

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

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

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/draft-IERC20Permit.sol";
import "../../../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;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

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

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

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

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

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

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

pragma solidity ^0.8.0;

/**
 * @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;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/cryptography/ECDSA.sol)

pragma solidity ^0.8.0;

import "../Strings.sol";

/**
 * @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,
        InvalidSignatureV // Deprecated in v4.8
    }

    function _throwError(RecoverError error) private pure {
        if (error == RecoverError.NoError) {
            return; // no error: do nothing
        } else if (error == RecoverError.InvalidSignature) {
            revert("ECDSA: invalid signature");
        } else if (error == RecoverError.InvalidSignatureLength) {
            revert("ECDSA: invalid signature length");
        } else if (error == RecoverError.InvalidSignatureS) {
            revert("ECDSA: invalid signature 's' value");
        }
    }

    /**
     * @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 opcode 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 {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]
     *
     * _Available since v4.3._
     */
    function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) {
        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);
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode 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 {toEthSignedMessageHash} on it.
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, signature);
        _throwError(error);
        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]
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address, RecoverError) {
        bytes32 s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);
        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.
     *
     * _Available since v4.2._
     */
    function recover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, r, vs);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `v`,
     * `r` and `s` signature fields separately.
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address, RecoverError) {
        // 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);
        }

        // 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);
        }

        return (signer, RecoverError.NoError);
    }

    /**
     * @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) = tryRecover(hash, v, r, s);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from a `hash`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {
        // 32 is the length in bytes of hash,
        // enforced by the type signature above
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from `s`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n", Strings.toString(s.length), s));
    }

    /**
     * @dev Returns an Ethereum Signed Typed Data, created from a
     * `domainSeparator` and a `structHash`. This produces hash corresponding
     * to the one signed with the
     * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]
     * JSON-RPC method as part of EIP-712.
     *
     * See {recover}.
     */
    function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/cryptography/EIP712.sol)

pragma solidity ^0.8.0;

import "./ECDSA.sol";

/**
 * @dev https://eips.ethereum.org/EIPS/eip-712[EIP 712] is a standard for hashing and signing of typed structured data.
 *
 * The encoding specified in the EIP is very generic, and such a generic implementation in Solidity is not feasible,
 * thus this contract does not implement the encoding itself. Protocols need to implement the type-specific encoding
 * they need in their contracts using a combination of `abi.encode` and `keccak256`.
 *
 * This contract implements the EIP 712 domain separator ({_domainSeparatorV4}) that is used as part of the encoding
 * scheme, and the final step of the encoding to obtain the message digest that is then signed via ECDSA
 * ({_hashTypedDataV4}).
 *
 * The implementation of the domain separator was designed to be as efficient as possible while still properly updating
 * the chain id to protect against replay attacks on an eventual fork of the chain.
 *
 * NOTE: This contract implements the version of the encoding known as "v4", as implemented by the JSON RPC method
 * https://docs.metamask.io/guide/signing-data.html[`eth_signTypedDataV4` in MetaMask].
 *
 * _Available since v3.4._
 */
abstract contract EIP712 {
    /* solhint-disable var-name-mixedcase */
    // Cache the domain separator as an immutable value, but also store the chain id that it corresponds to, in order to
    // invalidate the cached domain separator if the chain id changes.
    bytes32 private immutable _CACHED_DOMAIN_SEPARATOR;
    uint256 private immutable _CACHED_CHAIN_ID;
    address private immutable _CACHED_THIS;

    bytes32 private immutable _HASHED_NAME;
    bytes32 private immutable _HASHED_VERSION;
    bytes32 private immutable _TYPE_HASH;

    /* solhint-enable var-name-mixedcase */

    /**
     * @dev Initializes the domain separator and parameter caches.
     *
     * The meaning of `name` and `version` is specified in
     * https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP 712]:
     *
     * - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol.
     * - `version`: the current major version of the signing domain.
     *
     * NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart
     * contract upgrade].
     */
    constructor(string memory name, string memory version) {
        bytes32 hashedName = keccak256(bytes(name));
        bytes32 hashedVersion = keccak256(bytes(version));
        bytes32 typeHash = keccak256(
            "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"
        );
        _HASHED_NAME = hashedName;
        _HASHED_VERSION = hashedVersion;
        _CACHED_CHAIN_ID = block.chainid;
        _CACHED_DOMAIN_SEPARATOR = _buildDomainSeparator(typeHash, hashedName, hashedVersion);
        _CACHED_THIS = address(this);
        _TYPE_HASH = typeHash;
    }

    /**
     * @dev Returns the domain separator for the current chain.
     */
    function _domainSeparatorV4() internal view returns (bytes32) {
        if (address(this) == _CACHED_THIS && block.chainid == _CACHED_CHAIN_ID) {
            return _CACHED_DOMAIN_SEPARATOR;
        } else {
            return _buildDomainSeparator(_TYPE_HASH, _HASHED_NAME, _HASHED_VERSION);
        }
    }

    function _buildDomainSeparator(
        bytes32 typeHash,
        bytes32 nameHash,
        bytes32 versionHash
    ) private view returns (bytes32) {
        return keccak256(abi.encode(typeHash, nameHash, versionHash, block.chainid, address(this)));
    }

    /**
     * @dev Given an already https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct[hashed struct], this
     * function returns the hash of the fully encoded EIP712 message for this domain.
     *
     * This hash can be used together with {ECDSA-recover} to obtain the signer of a message. For example:
     *
     * ```solidity
     * bytes32 digest = _hashTypedDataV4(keccak256(abi.encode(
     *     keccak256("Mail(address to,string contents)"),
     *     mailTo,
     *     keccak256(bytes(mailContents))
     * )));
     * address signer = ECDSA.recover(digest, signature);
     * ```
     */
    function _hashTypedDataV4(bytes32 structHash) internal view virtual returns (bytes32) {
        return ECDSA.toTypedDataHash(_domainSeparatorV4(), structHash);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    enum Rounding {
        Down, // Toward negative infinity
        Up, // Toward infinity
        Zero // Toward zero
    }

    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow.
        return (a & b) + (a ^ b) / 2;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a == 0 ? 0 : (a - 1) / b + 1;
    }

    /**
     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
     * with further edits by Uniswap Labs also under MIT license.
     */
    function mulDiv(
        uint256 x,
        uint256 y,
        uint256 denominator
    ) internal pure returns (uint256 result) {
        unchecked {
            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
            // variables such that product = prod1 * 2^256 + prod0.
            uint256 prod0; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                prod0 := mul(x, y)
                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
            }

            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1);

            ///////////////////////////////////////////////
            // 512 by 256 division.
            ///////////////////////////////////////////////

            // Make division exact by subtracting the remainder from [prod1 prod0].
            uint256 remainder;
            assembly {
                // Compute remainder using mulmod.
                remainder := mulmod(x, y, denominator)

                // Subtract 256 bit number from 512 bit number.
                prod1 := sub(prod1, gt(remainder, prod0))
                prod0 := sub(prod0, remainder)
            }

            // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
            // See https://cs.stackexchange.com/q/138556/92363.

            // Does not overflow because the denominator cannot be zero at this stage in the function.
            uint256 twos = denominator & (~denominator + 1);
            assembly {
                // Divide denominator by twos.
                denominator := div(denominator, twos)

                // Divide [prod1 prod0] by twos.
                prod0 := div(prod0, twos)

                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
                twos := add(div(sub(0, twos), twos), 1)
            }

            // Shift in bits from prod1 into prod0.
            prod0 |= prod1 * twos;

            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
            // four bits. That is, denominator * inv = 1 mod 2^4.
            uint256 inverse = (3 * denominator) ^ 2;

            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
            // in modular arithmetic, doubling the correct bits in each step.
            inverse *= 2 - denominator * inverse; // inverse mod 2^8
            inverse *= 2 - denominator * inverse; // inverse mod 2^16
            inverse *= 2 - denominator * inverse; // inverse mod 2^32
            inverse *= 2 - denominator * inverse; // inverse mod 2^64
            inverse *= 2 - denominator * inverse; // inverse mod 2^128
            inverse *= 2 - denominator * inverse; // inverse mod 2^256

            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inverse;
            return result;
        }
    }

    /**
     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
     */
    function mulDiv(
        uint256 x,
        uint256 y,
        uint256 denominator,
        Rounding rounding
    ) internal pure returns (uint256) {
        uint256 result = mulDiv(x, y, denominator);
        if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
            result += 1;
        }
        return result;
    }

    /**
     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
     *
     * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
     */
    function sqrt(uint256 a) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
        //
        // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
        //
        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
        // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
        // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
        //
        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
        uint256 result = 1 << (log2(a) >> 1);

        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
        // into the expected uint128 result.
        unchecked {
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            return min(result, a / result);
        }
    }

    /**
     * @notice Calculates sqrt(a), following the selected rounding direction.
     */
    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = sqrt(a);
            return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 2, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 128;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 64;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 32;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 16;
            }
            if (value >> 8 > 0) {
                value >>= 8;
                result += 8;
            }
            if (value >> 4 > 0) {
                value >>= 4;
                result += 4;
            }
            if (value >> 2 > 0) {
                value >>= 2;
                result += 2;
            }
            if (value >> 1 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log2(value);
            return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 10, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >= 10**64) {
                value /= 10**64;
                result += 64;
            }
            if (value >= 10**32) {
                value /= 10**32;
                result += 32;
            }
            if (value >= 10**16) {
                value /= 10**16;
                result += 16;
            }
            if (value >= 10**8) {
                value /= 10**8;
                result += 8;
            }
            if (value >= 10**4) {
                value /= 10**4;
                result += 4;
            }
            if (value >= 10**2) {
                value /= 10**2;
                result += 2;
            }
            if (value >= 10**1) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log10(value);
            return result + (rounding == Rounding.Up && 10**result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 256, rounded down, of a positive value.
     * Returns 0 if given 0.
     *
     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
     */
    function log256(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 16;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 8;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 4;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 2;
            }
            if (value >> 8 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (rounding == Rounding.Up && 1 << (result * 8) < value ? 1 : 0);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

import "./math/Math.sol";

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        unchecked {
            uint256 length = Math.log10(value) + 1;
            string memory buffer = new string(length);
            uint256 ptr;
            /// @solidity memory-safe-assembly
            assembly {
                ptr := add(buffer, add(32, length))
            }
            while (true) {
                ptr--;
                /// @solidity memory-safe-assembly
                assembly {
                    mstore8(ptr, byte(mod(value, 10), _SYMBOLS))
                }
                value /= 10;
                if (value == 0) break;
            }
            return buffer;
        }
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        unchecked {
            return toHexString(value, Math.log256(value) + 1);
        }
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.18;

import { EIP712 } from "@openzeppelin/contracts/utils/cryptography/EIP712.sol";
import { ECDSA } from "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";

// prettier-ignore
import {
    AttestationRequest,
    AttestationRequestData,
    DelegatedAttestationRequest,
    DelegatedRevocationRequest,
    RevocationRequest,
    RevocationRequestData
} from "./IEAS.sol";

import { EIP712Signature } from "./Types.sol";

/**
 * @title EIP712 typed signatures verifier for EAS delegated attestations.
 */
abstract contract EIP712Verifier is EIP712 {
    error InvalidSignature();

    // The hash of the data type used to relay calls to the attest function. It's the value of
    // keccak256("Attest(bytes32 schema,address recipient,uint64 expirationTime,bool revocable,bytes32 refUID,bytes data,uint256 nonce)").
    bytes32 private constant ATTEST_TYPEHASH = 0xdbfdf8dc2b135c26253e00d5b6cbe6f20457e003fd526d97cea183883570de61;

    // The hash of the data type used to relay calls to the revoke function. It's the value of
    // keccak256("Revoke(bytes32 schema,bytes32 uid,uint256 nonce)").
    bytes32 private constant REVOKE_TYPEHASH = 0xa98d02348410c9c76735e0d0bb1396f4015ac2bb9615f9c2611d19d7a8a99650;

    // Replay protection nonces.
    mapping(address => uint256) private _nonces;

    /**
     * @dev Creates a new EIP712Verifier instance.
     *
     * @param version The current major version of the signing domain
     */
    constructor(string memory version) EIP712("EAS", version) {}

    /**
     * @dev Returns the domain separator used in the encoding of the signatures for attest, and revoke.
     */
    function getDomainSeparator() external view returns (bytes32) {
        return _domainSeparatorV4();
    }

    /**
     * @dev Returns the current nonce per-account.
     *
     * @param account The requested account.
     *
     * @return The current nonce.
     */
    function getNonce(address account) external view returns (uint256) {
        return _nonces[account];
    }

    /**
     * Returns the EIP712 type hash for the attest function.
     */
    function getAttestTypeHash() external pure returns (bytes32) {
        return ATTEST_TYPEHASH;
    }

    /**
     * Returns the EIP712 type hash for the revoke function.
     */
    function getRevokeTypeHash() external pure returns (bytes32) {
        return REVOKE_TYPEHASH;
    }

    /**
     * @dev Verifies delegated attestation request.
     *
     * @param request The arguments of the delegated attestation request.
     */
    function _verifyAttest(DelegatedAttestationRequest memory request) internal {
        AttestationRequestData memory data = request.data;
        EIP712Signature memory signature = request.signature;

        uint256 nonce;
        unchecked {
            nonce = _nonces[request.attester]++;
        }

        bytes32 digest = _hashTypedDataV4(
            keccak256(
                abi.encode(
                    ATTEST_TYPEHASH,
                    request.schema,
                    data.recipient,
                    data.expirationTime,
                    data.revocable,
                    data.refUID,
                    keccak256(data.data),
                    nonce
                )
            )
        );

        if (ECDSA.recover(digest, signature.v, signature.r, signature.s) != request.attester) {
            revert InvalidSignature();
        }
    }

    /**
     * @dev Verifies delegated revocation request.
     *
     * @param request The arguments of the delegated revocation request.
     */
    function _verifyRevoke(DelegatedRevocationRequest memory request) internal {
        RevocationRequestData memory data = request.data;
        EIP712Signature memory signature = request.signature;

        uint256 nonce;
        unchecked {
            nonce = _nonces[request.revoker]++;
        }

        bytes32 digest = _hashTypedDataV4(keccak256(abi.encode(REVOKE_TYPEHASH, request.schema, data.uid, nonce)));

        if (ECDSA.recover(digest, signature.v, signature.r, signature.s) != request.revoker) {
            revert InvalidSignature();
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import { ISchemaRegistry } from "./ISchemaRegistry.sol";
import { Attestation, EIP712Signature } from "./Types.sol";

/**
 * @dev A struct representing the arguments of the attestation request.
 */
struct AttestationRequestData {
    address recipient; // The recipient of the attestation.
    uint64 expirationTime; // The time when the attestation expires (Unix timestamp).
    bool revocable; // Whether the attestation is revocable.
    bytes32 refUID; // The UID of the related attestation.
    bytes data; // Custom attestation data.
    uint256 value; // An explicit ETH amount to send to the resolver. This is important to prevent accidental user errors.
}

/**
 * @dev A struct representing the full arguments of the attestation request.
 */
struct AttestationRequest {
    bytes32 schema; // The unique identifier of the schema.
    AttestationRequestData data; // The arguments of the attestation request.
}

/**
 * @dev A struct representing the full arguments of the full delegated attestation request.
 */
struct DelegatedAttestationRequest {
    bytes32 schema; // The unique identifier of the schema.
    AttestationRequestData data; // The arguments of the attestation request.
    EIP712Signature signature; // The EIP712 signature data.
    address attester; // The attesting account.
}

/**
 * @dev A struct representing the full arguments of the multi attestation request.
 */
struct MultiAttestationRequest {
    bytes32 schema; // The unique identifier of the schema.
    AttestationRequestData[] data; // The arguments of the attestation request.
}

/**
 * @dev A struct representing the full arguments of the delegated multi attestation request.
 */
struct MultiDelegatedAttestationRequest {
    bytes32 schema; // The unique identifier of the schema.
    AttestationRequestData[] data; // The arguments of the attestation requests.
    EIP712Signature[] signatures; // The EIP712 signatures data. Please note that the signatures are assumed to be signed with increasing nonces.
    address attester; // The attesting account.
}

/**
 * @dev A struct representing the arguments of the revocation request.
 */
struct RevocationRequestData {
    bytes32 uid; // The UID of the attestation to revoke.
    uint256 value; // An explicit ETH amount to send to the resolver. This is important to prevent accidental user errors.
}

/**
 * @dev A struct representing the full arguments of the revocation request.
 */
struct RevocationRequest {
    bytes32 schema; // The unique identifier of the schema.
    RevocationRequestData data; // The arguments of the revocation request.
}

/**
 * @dev A struct representing the arguments of the full delegated revocation request.
 */
struct DelegatedRevocationRequest {
    bytes32 schema; // The unique identifier of the schema.
    RevocationRequestData data; // The arguments of the revocation request.
    EIP712Signature signature; // The EIP712 signature data.
    address revoker; // The revoking account.
}

/**
 * @dev A struct representing the full arguments of the multi revocation request.
 */
struct MultiRevocationRequest {
    bytes32 schema; // The unique identifier of the schema.
    RevocationRequestData[] data; // The arguments of the revocation request.
}

/**
 * @dev A struct representing the full arguments of the delegated multi revocation request.
 */
struct MultiDelegatedRevocationRequest {
    bytes32 schema; // The unique identifier of the schema.
    RevocationRequestData[] data; // The arguments of the revocation requests.
    EIP712Signature[] signatures; // The EIP712 signatures data. Please note that the signatures are assumed to be signed with increasing nonces.
    address revoker; // The revoking account.
}

/**
 * @title EAS - Ethereum Attestation Service interface.
 */
interface IEAS {
    /**
     * @dev Emitted when an attestation has been made.
     *
     * @param recipient The recipient of the attestation.
     * @param attester The attesting account.
     * @param uid The UID the revoked attestation.
     * @param schema The UID of the schema.
     */
    event Attested(address indexed recipient, address indexed attester, bytes32 uid, bytes32 indexed schema);

    /**
     * @dev Emitted when an attestation has been revoked.
     *
     * @param recipient The recipient of the attestation.
     * @param attester The attesting account.
     * @param schema The UID of the schema.
     * @param uid The UID the revoked attestation.
     */
    event Revoked(address indexed recipient, address indexed attester, bytes32 uid, bytes32 indexed schema);

    /**
     * @dev Emitted when a data has been timestamped.
     *
     * @param data The data.
     * @param timestamp The timestamp.
     */
    event Timestamped(bytes32 indexed data, uint64 indexed timestamp);

    /**
     * @dev Emitted when a data has been revoked.
     *
     * @param revoker The address of the revoker.
     * @param data The data.
     * @param timestamp The timestamp.
     */
    event RevokedOffchain(address indexed revoker, bytes32 indexed data, uint64 indexed timestamp);

    /**
     * @dev Returns the address of the global schema registry.
     *
     * @return The address of the global schema registry.
     */
    function getSchemaRegistry() external view returns (ISchemaRegistry);

    /**
     * @dev Attests to a specific schema.
     *
     * @param request The arguments of the attestation request.
     *
     * Example:
     *
     * attest({
     *     schema: "0facc36681cbe2456019c1b0d1e7bedd6d1d40f6f324bf3dd3a4cef2999200a0",
     *     data: {
     *         recipient: "0xdEADBeAFdeAdbEafdeadbeafDeAdbEAFdeadbeaf",
     *         expirationTime: 0,
     *         revocable: true,
     *         refUID: "0x0000000000000000000000000000000000000000000000000000000000000000",
     *         data: "0xF00D",
     *         value: 0
     *     }
     * })
     *
     * @return The UID of the new attestation.
     */
    function attest(AttestationRequest calldata request) external payable returns (bytes32);

    /**
     * @dev Attests to a specific schema via the provided EIP712 signature.
     *
     * @param delegatedRequest The arguments of the delegated attestation request.
     *
     * Example:
     *
     * attestByDelegation({
     *     schema: '0x8e72f5bc0a8d4be6aa98360baa889040c50a0e51f32dbf0baa5199bd93472ebc',
     *     data: {
     *         recipient: '0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266',
     *         expirationTime: 1673891048,
     *         revocable: true,
     *         refUID: '0x0000000000000000000000000000000000000000000000000000000000000000',
     *         data: '0x1234',
     *         value: 0
     *     },
     *     signature: {
     *         v: 28,
     *         r: '0x148c...b25b',
     *         s: '0x5a72...be22'
     *     },
     *     attester: '0xc5E8740aD971409492b1A63Db8d83025e0Fc427e'
     * })
     *
     * @return The UID of the new attestation.
     */
    function attestByDelegation(
        DelegatedAttestationRequest calldata delegatedRequest
    ) external payable returns (bytes32);

    /**
     * @dev Attests to multiple schemas.
     *
     * @param multiRequests The arguments of the multi attestation requests. The requests should be grouped by distinct
     * schema ids to benefit from the best batching optimization.
     *
     * Example:
     *
     * multiAttest([{
     *     schema: '0x33e9094830a5cba5554d1954310e4fbed2ef5f859ec1404619adea4207f391fd',
     *     data: [{
     *         recipient: '0xdEADBeAFdeAdbEafdeadbeafDeAdbEAFdeadbeaf',
     *         expirationTime: 1673891048,
     *         revocable: true,
     *         refUID: '0x0000000000000000000000000000000000000000000000000000000000000000',
     *         data: '0x1234',
     *         value: 1000
     *     },
     *     {
     *         recipient: '0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266',
     *         expirationTime: 0,
     *         revocable: false,
     *         refUID: '0x480df4a039efc31b11bfdf491b383ca138b6bde160988222a2a3509c02cee174',
     *         data: '0x00',
     *         value: 0
     *     }],
     * },
     * {
     *     schema: '0x5ac273ce41e3c8bfa383efe7c03e54c5f0bff29c9f11ef6ffa930fc84ca32425',
     *     data: [{
     *         recipient: '0xdEADBeAFdeAdbEafdeadbeafDeAdbEAFdeadbeaf',
     *         expirationTime: 0,
     *         revocable: true,
     *         refUID: '0x75bf2ed8dca25a8190c50c52db136664de25b2449535839008ccfdab469b214f',
     *         data: '0x12345678',
     *         value: 0
     *     },
     * }])
     *
     * @return The UIDs of the new attestations.
     */
    function multiAttest(MultiAttestationRequest[] calldata multiRequests) external payable returns (bytes32[] memory);

    /**
     * @dev Attests to multiple schemas using via provided EIP712 signatures.
     *
     * @param multiDelegatedRequests The arguments of the delegated multi attestation requests. The requests should be
     * grouped by distinct schema ids to benefit from the best batching optimization.
     *
     * Example:
     *
     * multiAttestByDelegation([{
     *     schema: '0x8e72f5bc0a8d4be6aa98360baa889040c50a0e51f32dbf0baa5199bd93472ebc',
     *     data: [{
     *         recipient: '0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266',
     *         expirationTime: 1673891048,
     *         revocable: true,
     *         refUID: '0x0000000000000000000000000000000000000000000000000000000000000000',
     *         data: '0x1234',
     *         value: 0
     *     },
     *     {
     *         recipient: '0xdEADBeAFdeAdbEafdeadbeafDeAdbEAFdeadbeaf',
     *         expirationTime: 0,
     *         revocable: false,
     *         refUID: '0x0000000000000000000000000000000000000000000000000000000000000000',
     *         data: '0x00',
     *         value: 0
     *     }],
     *     signatures: [{
     *         v: 28,
     *         r: '0x148c...b25b',
     *         s: '0x5a72...be22'
     *     },
     *     {
     *         v: 28,
     *         r: '0x487s...67bb',
     *         s: '0x12ad...2366'
     *     }],
     *     attester: '0x1D86495b2A7B524D747d2839b3C645Bed32e8CF4'
     * }])
     *
     * @return The UIDs of the new attestations.
     */
    function multiAttestByDelegation(
        MultiDelegatedAttestationRequest[] calldata multiDelegatedRequests
    ) external payable returns (bytes32[] memory);

    /**
     * @dev Revokes an existing attestation to a specific schema.
     *
     * Example:
     *
     * revoke({
     *     schema: '0x8e72f5bc0a8d4be6aa98360baa889040c50a0e51f32dbf0baa5199bd93472ebc',
     *     data: {
     *         uid: '0x101032e487642ee04ee17049f99a70590c735b8614079fc9275f9dd57c00966d',
     *         value: 0
     *     }
     * })
     *
     * @param request The arguments of the revocation request.
     */
    function revoke(RevocationRequest calldata request) external payable;

    /**
     * @dev Revokes an existing attestation to a specific schema via the provided EIP712 signature.
     *
     * Example:
     *
     * revokeByDelegation({
     *     schema: '0x8e72f5bc0a8d4be6aa98360baa889040c50a0e51f32dbf0baa5199bd93472ebc',
     *     data: {
     *         uid: '0xcbbc12102578c642a0f7b34fe7111e41afa25683b6cd7b5a14caf90fa14d24ba',
     *         value: 0
     *     },
     *     signature: {
     *         v: 27,
     *         r: '0xb593...7142',
     *         s: '0x0f5b...2cce'
     *     },
     *     revoker: '0x244934dd3e31bE2c81f84ECf0b3E6329F5381992'
     * })
     *
     * @param delegatedRequest The arguments of the delegated revocation request.
     */
    function revokeByDelegation(DelegatedRevocationRequest calldata delegatedRequest) external payable;

    /**
     * @dev Revokes existing attestations to multiple schemas.
     *
     * @param multiRequests The arguments of the multi revocation requests. The requests should be grouped by distinct
     * schema ids to benefit from the best batching optimization.
     *
     * Example:
     *
     * multiRevoke([{
     *     schema: '0x8e72f5bc0a8d4be6aa98360baa889040c50a0e51f32dbf0baa5199bd93472ebc',
     *     data: [{
     *         uid: '0x211296a1ca0d7f9f2cfebf0daaa575bea9b20e968d81aef4e743d699c6ac4b25',
     *         value: 1000
     *     },
     *     {
     *         uid: '0xe160ac1bd3606a287b4d53d5d1d6da5895f65b4b4bab6d93aaf5046e48167ade',
     *         value: 0
     *     }],
     * },
     * {
     *     schema: '0x5ac273ce41e3c8bfa383efe7c03e54c5f0bff29c9f11ef6ffa930fc84ca32425',
     *     data: [{
     *         uid: '0x053d42abce1fd7c8fcddfae21845ad34dae287b2c326220b03ba241bc5a8f019',
     *         value: 0
     *     },
     * }])
     */
    function multiRevoke(MultiRevocationRequest[] calldata multiRequests) external payable;

    /**
     * @dev Revokes existing attestations to multiple schemas via provided EIP712 signatures.
     *
     * @param multiDelegatedRequests The arguments of the delegated multi revocation attestation requests. The requests should be
     * grouped by distinct schema ids to benefit from the best batching optimization.
     *
     * Example:
     *
     * multiRevokeByDelegation([{
     *     schema: '0x8e72f5bc0a8d4be6aa98360baa889040c50a0e51f32dbf0baa5199bd93472ebc',
     *     data: [{
     *         uid: '0x211296a1ca0d7f9f2cfebf0daaa575bea9b20e968d81aef4e743d699c6ac4b25',
     *         value: 1000
     *     },
     *     {
     *         uid: '0xe160ac1bd3606a287b4d53d5d1d6da5895f65b4b4bab6d93aaf5046e48167ade',
     *         value: 0
     *     }],
     *     signatures: [{
     *         v: 28,
     *         r: '0x148c...b25b',
     *         s: '0x5a72...be22'
     *     },
     *     {
     *         v: 28,
     *         r: '0x487s...67bb',
     *         s: '0x12ad...2366'
     *     }],
     *     revoker: '0x244934dd3e31bE2c81f84ECf0b3E6329F5381992'
     * }])
     *
     */
    function multiRevokeByDelegation(
        MultiDelegatedRevocationRequest[] calldata multiDelegatedRequests
    ) external payable;

    /**
     * @dev Timestamps the specified bytes32 data.
     *
     * @param data The data to timestamp.
     *
     * @return The timestamp the data was timestamped with.
     */
    function timestamp(bytes32 data) external returns (uint64);

    /**
     * @dev Timestamps the specified multiple bytes32 data.
     *
     * @param data The data to timestamp.
     *
     * @return The timestamp the data was timestamped with.
     */
    function multiTimestamp(bytes32[] calldata data) external returns (uint64);

    /**
     * @dev Revokes the specified bytes32 data.
     *
     * @param data The data to timestamp.
     *
     * @return The timestamp the data was revoked with.
     */
    function revokeOffchain(bytes32 data) external returns (uint64);

    /**
     * @dev Revokes the specified multiple bytes32 data.
     *
     * @param data The data to timestamp.
     *
     * @return The timestamp the data was revoked with.
     */
    function multiRevokeOffchain(bytes32[] calldata data) external returns (uint64);

    /**
     * @dev Returns an existing attestation by UID.
     *
     * @param uid The UID of the attestation to retrieve.
     *
     * @return The attestation data members.
     */
    function getAttestation(bytes32 uid) external view returns (Attestation memory);

    /**
     * @dev Checks whether an attestation exists.
     *
     * @param uid The UID of the attestation to retrieve.
     *
     * @return Whether an attestation exists.
     */
    function isAttestationValid(bytes32 uid) external view returns (bool);

    /**
     * @dev Returns the timestamp that the specified data was timestamped with.
     *
     * @param data The data to query.
     *
     * @return The timestamp the data was timestamped with.
     */
    function getTimestamp(bytes32 data) external view returns (uint64);

    /**
     * @dev Returns the timestamp that the specified data was timestamped with.
     *
     * @param data The data to query.
     *
     * @return The timestamp the data was timestamped with.
     */
    function getRevokeOffchain(address revoker, bytes32 data) external view returns (uint64);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import { ISchemaResolver } from "./resolver/ISchemaResolver.sol";

/**
 * @title A struct representing a record for a submitted schema.
 */
struct SchemaRecord {
    bytes32 uid; // The unique identifier of the schema.
    ISchemaResolver resolver; // Optional schema resolver.
    bool revocable; // Whether the schema allows revocations explicitly.
    string schema; // Custom specification of the schema (e.g., an ABI).
}

/**
 * @title The global schema registry interface.
 */
interface ISchemaRegistry {
    /**
     * @dev Emitted when a new schema has been registered
     *
     * @param uid The schema UID.
     * @param registerer The address of the account used to register the schema.
     */
    event Registered(bytes32 indexed uid, address registerer);

    /**
     * @dev Submits and reserves a new schema
     *
     * @param schema The schema data schema.
     * @param resolver An optional schema resolver.
     * @param revocable Whether the schema allows revocations explicitly.
     *
     * @return The UID of the new schema.
     */
    function register(string calldata schema, ISchemaResolver resolver, bool revocable) external returns (bytes32);

    /**
     * @dev Returns an existing schema by UID
     *
     * @param uid The UID of the schema to retrieve.
     *
     * @return The schema data members.
     */
    function getSchema(bytes32 uid) external view returns (SchemaRecord memory);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import { Attestation } from "../Types.sol";

/**
 * @title The interface of an optional schema resolver.
 */
interface ISchemaResolver {
    /**
     * @dev Returns whether the resolver supports ETH transfers.
     */
    function isPayable() external pure returns (bool);

    /**
     * @dev Processes an attestation and verifies whether it's valid.
     *
     * @param attestation The new attestation.
     *
     * @return Whether the attestation is valid.
     */
    function attest(Attestation calldata attestation) external payable returns (bool);

    /**
     * @dev Processes multiple attestations and verifies whether they are valid.
     *
     * @param attestations The new attestations.
     * @param values Explicit ETH amounts which were sent with each attestation.
     *
     * @return Whether all the attestations are valid.
     */
    function multiAttest(
        Attestation[] calldata attestations,
        uint256[] calldata values
    ) external payable returns (bool);

    /**
     * @dev Processes an attestation revocation and verifies if it can be revoked.
     *
     * @param attestation The existing attestation to be revoked.
     *
     * @return Whether the attestation can be revoked.
     */
    function revoke(Attestation calldata attestation) external payable returns (bool);

    /**
     * @dev Processes revocation of multiple attestation and verifies they can be revoked.
     *
     * @param attestations The existing attestations to be revoked.
     * @param values Explicit ETH amounts which were sent with each revocation.
     *
     * @return Whether the attestations can be revoked.
     */
    function multiRevoke(
        Attestation[] calldata attestations,
        uint256[] calldata values
    ) external payable returns (bool);
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.18;

import { IEAS, Attestation } from "../IEAS.sol";

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

/**
 * @title A base resolver contract
 */
abstract contract SchemaResolver is ISchemaResolver {
    error AccessDenied();
    error InsufficientValue();
    error InvalidEAS();
    error NotPayable();

    // The version of the contract.
    string public constant VERSION = "0.26";

    // The global EAS contract.
    IEAS internal immutable _eas;

    /**
     * @dev Creates a new resolver.
     *
     * @param eas The address of the global EAS contract.
     */
    constructor(IEAS eas) {
        if (address(eas) == address(0)) {
            revert InvalidEAS();
        }

        _eas = eas;
    }

    /**
     * @dev Ensures that only the EAS contract can make this call.
     */
    modifier onlyEAS() {
        _onlyEAS();

        _;
    }

    /**
     * @inheritdoc ISchemaResolver
     */
    function isPayable() public pure virtual returns (bool) {
        return false;
    }

    /**
     * @dev ETH callback.
     */
    receive() external payable virtual {
        if (!isPayable()) {
            revert NotPayable();
        }
    }

    /**
     * @inheritdoc ISchemaResolver
     */
    function attest(Attestation calldata attestation) external payable onlyEAS returns (bool) {
        return onAttest(attestation, msg.value);
    }

    /**
     * @inheritdoc ISchemaResolver
     */
    function multiAttest(
        Attestation[] calldata attestations,
        uint256[] calldata values
    ) external payable onlyEAS returns (bool) {
        uint256 length = attestations.length;

        // We are keeping track of the remaining ETH amount that can be sent to resolvers and will keep deducting
        // from it to verify that there isn't any attempt to send too much ETH to resolvers. Please note that unless
        // some ETH was stuck in the contract by accident (which shouldn't happen in normal conditions), it won't be
        // possible to send too much ETH anyway.
        uint256 remainingValue = msg.value;

        for (uint256 i = 0; i < length; ) {
            // Ensure that the attester/revoker doesn't try to spend more than available.
            uint256 value = values[i];
            if (value > remainingValue) {
                revert InsufficientValue();
            }

            // Forward the attestation to the underlying resolver and revert in case it isn't approved.
            if (!onAttest(attestations[i], value)) {
                return false;
            }

            unchecked {
                // Subtract the ETH amount, that was provided to this attestation, from the global remaining ETH amount.
                remainingValue -= value;

                ++i;
            }
        }

        return true;
    }

    /**
     * @inheritdoc ISchemaResolver
     */
    function revoke(Attestation calldata attestation) external payable onlyEAS returns (bool) {
        return onRevoke(attestation, msg.value);
    }

    /**
     * @inheritdoc ISchemaResolver
     */
    function multiRevoke(
        Attestation[] calldata attestations,
        uint256[] calldata values
    ) external payable onlyEAS returns (bool) {
        uint256 length = attestations.length;

        // We are keeping track of the remaining ETH amount that can be sent to resolvers and will keep deducting
        // from it to verify that there isn't any attempt to send too much ETH to resolvers. Please note that unless
        // some ETH was stuck in the contract by accident (which shouldn't happen in normal conditions), it won't be
        // possible to send too much ETH anyway.
        uint256 remainingValue = msg.value;

        for (uint256 i = 0; i < length; ) {
            // Ensure that the attester/revoker doesn't try to spend more than available.
            uint256 value = values[i];
            if (value > remainingValue) {
                revert InsufficientValue();
            }

            // Forward the revocation to the underlying resolver and revert in case it isn't approved.
            if (!onRevoke(attestations[i], value)) {
                return false;
            }

            unchecked {
                // Subtract the ETH amount, that was provided to this attestation, from the global remaining ETH amount.
                remainingValue -= value;

                ++i;
            }
        }

        return true;
    }

    /**
     * @dev A resolver callback that should be implemented by child contracts.
     *
     * @param attestation The new attestation.
     * @param value An explicit ETH amount that was sent to the resolver. Please note that this value is verified in
     * both attest() and multiAttest() callbacks EAS-only callbacks and that in case of multi attestations, it'll
     * usually hold that msg.value != value, since msg.value aggregated the sent ETH amounts for all the attestations
     * in the batch.
     *
     * @return Whether the attestation is valid.
     */
    function onAttest(Attestation calldata attestation, uint256 value) internal virtual returns (bool);

    /**
     * @dev Processes an attestation revocation and verifies if it can be revoked.
     *
     * @param attestation The existing attestation to be revoked.
     * @param value An explicit ETH amount that was sent to the resolver. Please note that this value is verified in
     * both revoke() and multiRevoke() callbacks EAS-only callbacks and that in case of multi attestations, it'll
     * usually hold that msg.value != value, since msg.value aggregated the sent ETH amounts for all the attestations
     * in the batch.
     *
     * @return Whether the attestation can be revoked.
     */
    function onRevoke(Attestation calldata attestation, uint256 value) internal virtual returns (bool);

    /**
     * @dev Ensures that only the EAS contract can make this call.
     */
    function _onlyEAS() private view {
        if (msg.sender != address(_eas)) {
            revert AccessDenied();
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.18;

import { EMPTY_UID } from "./Types.sol";
import { ISchemaRegistry, SchemaRecord } from "./ISchemaRegistry.sol";

import { ISchemaResolver } from "./resolver/ISchemaResolver.sol";

/**
 * @title The global schema registry.
 */
contract SchemaRegistry is ISchemaRegistry {
    error AlreadyExists();

    // The version of the contract.
    string public constant VERSION = "0.26";

    // The global mapping between schema records and their IDs.
    mapping(bytes32 uid => SchemaRecord schemaRecord) private _registry;

    /**
     * @inheritdoc ISchemaRegistry
     */
    function register(string calldata schema, ISchemaResolver resolver, bool revocable) external returns (bytes32) {
        SchemaRecord memory schemaRecord = SchemaRecord({
            uid: EMPTY_UID,
            schema: schema,
            resolver: resolver,
            revocable: revocable
        });

        bytes32 uid = _getUID(schemaRecord);
        if (_registry[uid].uid != EMPTY_UID) {
            revert AlreadyExists();
        }

        schemaRecord.uid = uid;
        _registry[uid] = schemaRecord;

        emit Registered(uid, msg.sender);

        return uid;
    }

    /**
     * @inheritdoc ISchemaRegistry
     */
    function getSchema(bytes32 uid) external view returns (SchemaRecord memory) {
        return _registry[uid];
    }

    /**
     * @dev Calculates a UID for a given schema.
     *
     * @param schemaRecord The input schema.
     *
     * @return schema UID.
     */
    function _getUID(SchemaRecord memory schemaRecord) private pure returns (bytes32) {
        return keccak256(abi.encodePacked(schemaRecord.schema, schemaRecord.resolver, schemaRecord.revocable));
    }
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.18;

// A representation of an empty/uninitialized UID.
bytes32 constant EMPTY_UID = 0;

/**
 * @dev A struct representing EIP712 signature data.
 */
struct EIP712Signature {
    uint8 v; // The recovery ID.
    bytes32 r; // The x-coordinate of the nonce R.
    bytes32 s; // The signature data.
}

/**
 * @dev A struct representing a single attestation.
 */
struct Attestation {
    bytes32 uid; // A unique identifier of the attestation.
    bytes32 schema; // The unique identifier of the schema.
    uint64 time; // The time when the attestation was created (Unix timestamp).
    uint64 expirationTime; // The time when the attestation expires (Unix timestamp).
    uint64 revocationTime; // The time when the attestation was revoked (Unix timestamp).
    bytes32 refUID; // The UID of the related attestation.
    address recipient; // The recipient of the attestation.
    address attester; // The attester/sender of the attestation.
    bool revocable; // Whether the attestation is revocable.
    bytes data; // Custom attestation data.
}

{
  "optimizer": {
    "enabled": true,
    "runs": 1000000
  },
  "viaIR": true,
  "metadata": {
    "bytecodeHash": "none",
    "useLiteralContent": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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RevocationRequest","name":"request","type":"tuple"}],"name":"revoke","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"components":[{"internalType":"bytes32","name":"schema","type":"bytes32"},{"components":[{"internalType":"bytes32","name":"uid","type":"bytes32"},{"internalType":"uint256","name":"value","type":"uint256"}],"internalType":"struct RevocationRequestData","name":"data","type":"tuple"},{"components":[{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"internalType":"struct EIP712Signature","name":"signature","type":"tuple"},{"internalType":"address","name":"revoker","type":"address"}],"internalType":"struct DelegatedRevocationRequest","name":"delegatedRequest","type":"tuple"}],"name":"revokeByDelegation","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"data","type":"bytes32"}],"name":"revokeOffchain","outputs":[{"internalType":"uint64","name":"","type":"uint64"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"data","type":"bytes32"}],"name":"timestamp","outputs":[{"internalType":"uint64","name":"","type":"uint64"}],"stateMutability":"nonpayable","type":"function"}]

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000000000000000000000000a7b39296258348c78294f95b872b282326a97bdf

-----Decoded View---------------
Arg [0] : registry (address): 0xA7b39296258348C78294F95B872b282326A97BDF

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000a7b39296258348c78294f95b872b282326a97bdf

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