// File: /Users/davidroon/projects/tribute-contracts/contracts/adapters/interfaces/IVoting.sol



pragma solidity ^0.8.0;

// SPDX-License-Identifier: MIT

import "../../core/DaoRegistry.sol";

/**
MIT License

Copyright (c) 2020 Openlaw

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
 */

interface IVoting {
    enum VotingState {
        NOT_STARTED,
        TIE,
        PASS,
        NOT_PASS,
        IN_PROGRESS,
        GRACE_PERIOD
    }

    function getAdapterName() external pure returns (string memory);

    function startNewVotingForProposal(
        DaoRegistry dao,
        bytes32 proposalId,
        bytes calldata data
    ) external;

    function getSenderAddress(
        DaoRegistry dao,
        address actionId,
        bytes memory data,
        address sender
    ) external returns (address);

    function voteResult(DaoRegistry dao, bytes32 proposalId)
        external
        returns (VotingState state);
}

// File: /Users/davidroon/projects/tribute-contracts/contracts/adapters/voting/KickBadReporterAdapter.sol



pragma solidity ^0.8.0;

// SPDX-License-Identifier: MIT

import "../../core/DaoRegistry.sol";
import "../../extensions/bank/Bank.sol";
import "../../core/DaoConstants.sol";
import "../../helpers/GuildKickHelper.sol";
import "../../guards/MemberGuard.sol";
import "../../guards/AdapterGuard.sol";
import "../interfaces/IVoting.sol";
import "./OffchainVoting.sol";
import "../../utils/Signatures.sol";

/**
MIT License

Copyright (c) 2021 Openlaw

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
 */

contract KickBadReporterAdapter is DaoConstants, MemberGuard {
    /*
     * default fallback function to prevent from sending ether to the contract
     */
    receive() external payable {
        revert("fallback revert");
    }

    function sponsorProposal(
        DaoRegistry dao,
        bytes32 proposalId,
        bytes calldata data
    ) external {
        OffchainVotingContract votingContract =
            OffchainVotingContract(dao.getAdapterAddress(VOTING));
        address sponsoredBy =
            votingContract.getSenderAddress(
                dao,
                address(this),
                data,
                msg.sender
            );
        _sponsorProposal(dao, proposalId, data, sponsoredBy, votingContract);
    }

    function _sponsorProposal(
        DaoRegistry dao,
        bytes32 proposalId,
        bytes memory data,
        address sponsoredBy,
        OffchainVotingContract votingContract
    ) internal onlyMember2(dao, sponsoredBy) {
        votingContract.sponsorChallengeProposal(dao, proposalId, sponsoredBy);
        votingContract.startNewVotingForProposal(dao, proposalId, data);
    }

    function processProposal(DaoRegistry dao, bytes32 proposalId) external {
        OffchainVotingContract votingContract =
            OffchainVotingContract(dao.getAdapterAddress(VOTING));

        votingContract.processChallengeProposal(dao, proposalId);

        IVoting.VotingState votingState =
            votingContract.voteResult(dao, proposalId);
        // the person has been kicked out
        if (votingState == IVoting.VotingState.PASS) {
            (, address challengeAddress) =
                votingContract.getChallengeDetails(dao, proposalId);
            GuildKickHelper.rageKick(dao, challengeAddress);
        } else if (
            votingState == IVoting.VotingState.NOT_PASS ||
            votingState == IVoting.VotingState.TIE
        ) {
            (uint256 units, address challengeAddress) =
                votingContract.getChallengeDetails(dao, proposalId);
            BankExtension bank = BankExtension(dao.getExtensionAddress(BANK));

            bank.subtractFromBalance(challengeAddress, LOOT, units);
            bank.addToBalance(challengeAddress, UNITS, units);
        } else {
            revert("vote not finished yet");
        }
    }
}

// File: /Users/davidroon/projects/tribute-contracts/contracts/adapters/voting/OffchainVoting.sol



pragma solidity ^0.8.0;
pragma experimental ABIEncoderV2;

// SPDX-License-Identifier: MIT

import "../../core/DaoRegistry.sol";
import "../../extensions/bank/Bank.sol";
import "../../core/DaoConstants.sol";
import "../../guards/MemberGuard.sol";
import "../../guards/AdapterGuard.sol";
import "../../utils/Signatures.sol";
import "../interfaces/IVoting.sol";
import "./Voting.sol";
import "./KickBadReporterAdapter.sol";
import "./SnapshotProposalContract.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/cryptography/MerkleProof.sol";

/**
MIT License

Copyright (c) 2020 Openlaw

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
 */

contract OffchainVotingContract is
    IVoting,
    DaoConstants,
    MemberGuard,
    AdapterGuard,
    Signatures,
    Ownable
{
    enum BadNodeError {
        OK,
        WRONG_PROPOSAL_ID,
        INVALID_CHOICE,
        AFTER_VOTING_PERIOD,
        BAD_SIGNATURE
    }

    struct ProposalChallenge {
        address reporter;
        uint256 units;
    }

    uint256 public constant NB_CHOICES = 2;

    SnapshotProposalContract private _snapshotContract;
    KickBadReporterAdapter private _handleBadReporterAdapter;

    string public constant VOTE_RESULT_NODE_TYPE =
        "Message(uint64 timestamp,uint88 nbYes,uint88 nbNo,uint32 index,uint32 choice,bytes32 proposalId)";

    string public constant ADAPTER_NAME = "OffchainVotingContract";
    string public constant VOTE_RESULT_ROOT_TYPE = "Message(bytes32 root)";
    bytes32 public constant VOTE_RESULT_NODE_TYPEHASH =
        keccak256(abi.encodePacked(VOTE_RESULT_NODE_TYPE));
    bytes32 public constant VOTE_RESULT_ROOT_TYPEHASH =
        keccak256(abi.encodePacked(VOTE_RESULT_ROOT_TYPE));

    bytes32 constant VotingPeriod = keccak256("offchainvoting.votingPeriod");
    bytes32 constant GracePeriod = keccak256("offchainvoting.gracePeriod");
    bytes32 constant FallbackThreshold =
        keccak256("offchainvoting.fallbackThreshold");

    struct VoteStepParams {
        uint256 previousYes;
        uint256 previousNo;
        bytes32 proposalId;
    }

    struct Voting {
        uint256 snapshot;
        address reporter;
        bytes32 resultRoot;
        uint256 nbYes;
        uint256 nbNo;
        uint256 startingTime;
        uint256 gracePeriodStartingTime;
        bool isChallenged;
        bool forceFailed;
        mapping(address => bool) fallbackVotes;
        uint256 fallbackVotesCount;
    }

    struct VoteResultNode {
        uint32 choice;
        uint64 index;
        uint64 timestamp;
        uint88 nbNo;
        uint88 nbYes;
        bytes sig;
        bytes32 proposalId;
        bytes32[] proof;
    }

    modifier onlyBadReporterAdapter() {
        require(msg.sender == address(_handleBadReporterAdapter), "only:hbra");
        _;
    }

    VotingContract public fallbackVoting;

    mapping(address => mapping(bytes32 => ProposalChallenge)) challengeProposals;
    mapping(address => mapping(bytes32 => Voting)) public votes;

    constructor(
        VotingContract _c,
        SnapshotProposalContract _spc,
        KickBadReporterAdapter _hbra,
        address _owner
    ) {
        require(address(_c) != address(0x0), "voting contract");
        require(address(_spc) != address(0x0), "snapshot proposal");
        require(address(_hbra) != address(0x0), "handle bad reporter");
        fallbackVoting = _c;
        _snapshotContract = _spc;
        _handleBadReporterAdapter = _hbra;
        Ownable(_owner);
    }

    function adminFailProposal(DaoRegistry dao, bytes32 proposalId)
        external
        onlyOwner
    {
        Voting storage vote = votes[address(dao)][proposalId];
        require(vote.startingTime > 0, "proposal has not started yet");

        vote.forceFailed = true;
    }

    function hashResultRoot(
        DaoRegistry dao,
        address actionId,
        bytes32 resultRoot
    ) public view returns (bytes32) {
        return
            keccak256(
                abi.encodePacked(
                    "\x19\x01",
                    _snapshotContract.DOMAIN_SEPARATOR(dao, actionId),
                    keccak256(abi.encode(VOTE_RESULT_ROOT_TYPEHASH, resultRoot))
                )
            );
    }

    function getAdapterName() external pure override returns (string memory) {
        return ADAPTER_NAME;
    }

    function getChallengeDetails(DaoRegistry dao, bytes32 proposalId)
        external
        view
        returns (uint256, address)
    {
        return (
            challengeProposals[address(dao)][proposalId].units,
            challengeProposals[address(dao)][proposalId].reporter
        );
    }

    function hashVotingResultNode(VoteResultNode memory node)
        public
        pure
        returns (bytes32)
    {
        return
            keccak256(
                abi.encode(
                    VOTE_RESULT_NODE_TYPEHASH,
                    node.timestamp,
                    node.nbYes,
                    node.nbNo,
                    node.index,
                    node.choice,
                    node.proposalId
                )
            );
    }

    function nodeHash(
        DaoRegistry dao,
        address actionId,
        VoteResultNode memory node
    ) public view returns (bytes32) {
        return
            keccak256(
                abi.encodePacked(
                    "\x19\x01",
                    _snapshotContract.DOMAIN_SEPARATOR(dao, actionId),
                    hashVotingResultNode(node)
                )
            );
    }

    function configureDao(
        DaoRegistry dao,
        uint256 votingPeriod,
        uint256 gracePeriod,
        uint256 fallbackThreshold
    ) external onlyAdapter(dao) {
        dao.setConfiguration(VotingPeriod, votingPeriod);
        dao.setConfiguration(GracePeriod, gracePeriod);
        dao.setConfiguration(FallbackThreshold, fallbackThreshold);
    }

    /** 
        What needs to be checked before submitting a vote result
        - if the grace period has ended, do nothing
        - if it's the first result, is this a right time to submit it?
             * is the diff between nbYes and nbNo +50% of the votes ?
             * is this after the voting period ?
        - if we already have a result that has been challenged
            * same as if there were no result yet

        - if we already have a result that has not been challenged
            * is the new one heavier than the previous one ?
         **/

    function submitVoteResult(
        DaoRegistry dao,
        bytes32 proposalId,
        bytes32 resultRoot,
        VoteResultNode memory result,
        bytes memory rootSig
    ) external {
        Voting storage vote = votes[address(dao)][proposalId];
        require(vote.snapshot > 0, "vote:not started");

        if (vote.resultRoot == bytes32(0) || vote.isChallenged) {
            require(
                _readyToSubmitResult(dao, vote, result.nbYes, result.nbNo),
                "vote:notReadyToSubmitResult"
            );
        }

        (address adapterAddress, ) = dao.proposals(proposalId);
        address reporter =
            ECDSA.recover(
                hashResultRoot(dao, adapterAddress, resultRoot),
                rootSig
            );
        address memberAddr = dao.getAddressIfDelegated(reporter);
        require(isActiveMember(dao, memberAddr), "not active member");
        BankExtension bank = BankExtension(dao.getExtensionAddress(BANK));
        uint256 nbMembers =
            bank.getPriorAmount(TOTAL, MEMBER_COUNT, vote.snapshot);
        require(nbMembers - 1 == result.index, "index:member_count mismatch");
        require(
            getBadNodeError(
                dao,
                proposalId,
                true,
                resultRoot,
                vote.snapshot,
                vote.gracePeriodStartingTime,
                result
            ) == BadNodeError.OK,
            "bad result"
        );

        require(
            vote.nbYes + vote.nbNo < result.nbYes + result.nbNo,
            "result weight too low"
        );

        if (
            vote.gracePeriodStartingTime == 0 ||
            vote.nbNo > vote.nbYes != result.nbNo > result.nbYes // check whether the new result changes the outcome
        ) {
            vote.gracePeriodStartingTime = block.timestamp;
        }

        vote.nbNo = result.nbNo;
        vote.nbYes = result.nbYes;
        vote.resultRoot = resultRoot;
        vote.reporter = memberAddr;
        vote.isChallenged = false;
    }

    function _readyToSubmitResult(
        DaoRegistry dao,
        Voting storage vote,
        uint256 nbYes,
        uint256 nbNo
    ) internal view returns (bool) {
        if (vote.forceFailed) {
            return false;
        }
        BankExtension bank = BankExtension(dao.getExtensionAddress(BANK));
        uint256 totalWeight = bank.getPriorAmount(TOTAL, UNITS, vote.snapshot);
        uint256 unvotedWeights = totalWeight - nbYes - nbNo;

        uint256 diff;
        if (nbYes > nbNo) {
            diff = nbYes - nbNo;
        } else {
            diff = nbNo - nbYes;
        }

        if (diff > unvotedWeights) {
            return true;
        }

        uint256 votingPeriod = dao.getConfiguration(VotingPeriod);
        return vote.startingTime + votingPeriod <= block.timestamp;
    }

    function getSenderAddress(
        DaoRegistry dao,
        address actionId,
        bytes memory data,
        address
    ) external view override returns (address) {
        SnapshotProposalContract.ProposalMessage memory proposal =
            abi.decode(data, (SnapshotProposalContract.ProposalMessage));
        return
            ECDSA.recover(
                _snapshotContract.hashMessage(dao, actionId, proposal),
                proposal.sig
            );
    }

    function startNewVotingForProposal(
        DaoRegistry dao,
        bytes32 proposalId,
        bytes memory data
    ) public override onlyAdapter(dao) {
        SnapshotProposalContract.ProposalMessage memory proposal =
            abi.decode(data, (SnapshotProposalContract.ProposalMessage));
        (bool success, uint256 blockNumber) =
            _stringToUint(proposal.payload.snapshot);
        require(success, "snapshot conversion error");
        BankExtension bank = BankExtension(dao.getExtensionAddress(BANK));

        bytes32 proposalHash =
            _snapshotContract.hashMessage(dao, msg.sender, proposal);
        address addr = ECDSA.recover(proposalHash, proposal.sig);

        address memberAddr = dao.getAddressIfDelegated(addr);
        require(bank.balanceOf(memberAddr, UNITS) > 0, "noActiveMember");
        require(
            blockNumber <= block.number,
            "snapshot block number should not be in the future"
        );
        require(blockNumber > 0, "block number cannot be 0");

        votes[address(dao)][proposalId].startingTime = block.timestamp;
        votes[address(dao)][proposalId].snapshot = blockNumber;
    }

    function _fallbackVotingActivated(
        DaoRegistry dao,
        uint256 fallbackVotesCount
    ) internal view returns (bool) {
        return
            fallbackVotesCount >
            (dao.getNbMembers() * 100) /
                dao.getConfiguration(FallbackThreshold);
    }

    /**
    possible results here:
    0: has not started
    1: tie
    2: pass
    3: not pass
    4: in progress
     */
    function voteResult(DaoRegistry dao, bytes32 proposalId)
        external
        view
        override
        returns (VotingState state)
    {
        Voting storage vote = votes[address(dao)][proposalId];
        if (vote.startingTime == 0) {
            return VotingState.NOT_STARTED;
        }

        if (vote.forceFailed) {
            return VotingState.NOT_PASS;
        }

        if (_fallbackVotingActivated(dao, vote.fallbackVotesCount)) {
            return fallbackVoting.voteResult(dao, proposalId);
        }

        if (vote.isChallenged) {
            return VotingState.IN_PROGRESS;
        }

        uint256 votingPeriod = dao.getConfiguration(VotingPeriod);

        //if the vote has started but the voting period has not passed yet, it's in progress
        if (block.timestamp < vote.startingTime + votingPeriod) {
            return VotingState.IN_PROGRESS;
        }

        uint256 gracePeriod = dao.getConfiguration(GracePeriod);

        //if no result have been submitted but we are before grace + voting period, then the proposal is GRACE_PERIOD
        if (
            vote.gracePeriodStartingTime == 0 &&
            block.timestamp < vote.startingTime + gracePeriod + votingPeriod
        ) {
            return VotingState.GRACE_PERIOD;
        }

        //if the vote has started but the voting period has not passed yet, it's in progress
        if (block.timestamp < vote.gracePeriodStartingTime + gracePeriod) {
            return VotingState.GRACE_PERIOD;
        }

        if (vote.nbYes > vote.nbNo) {
            return VotingState.PASS;
        }
        if (vote.nbYes < vote.nbNo) {
            return VotingState.NOT_PASS;
        }

        return VotingState.TIE;
    }

    function challengeBadFirstNode(
        DaoRegistry dao,
        bytes32 proposalId,
        VoteResultNode memory node
    ) external {
        require(node.index == 0, "only first node");
        Voting storage vote = votes[address(dao)][proposalId];
        (address adapterAddress, ) = dao.proposals(proposalId);
        require(vote.resultRoot != bytes32(0), "no result available yet!");
        bytes32 hashCurrent = nodeHash(dao, adapterAddress, node);
        //check that the step is indeed part of the result
        require(
            MerkleProof.verify(node.proof, vote.resultRoot, hashCurrent),
            "proof:bad"
        );

        (address actionId, ) = dao.proposals(proposalId);

        if (_checkStep(dao, actionId, node, VoteStepParams(0, 0, proposalId))) {
            _challengeResult(dao, proposalId);
        }
    }

    function challengeBadNode(
        DaoRegistry dao,
        bytes32 proposalId,
        VoteResultNode memory node
    ) external {
        Voting storage vote = votes[address(dao)][proposalId];
        if (
            getBadNodeError(
                dao,
                proposalId,
                false,
                vote.resultRoot,
                vote.snapshot,
                vote.gracePeriodStartingTime,
                node
            ) != BadNodeError.OK
        ) {
            _challengeResult(dao, proposalId);
        }
    }

    function _isValidChoice(uint256 choice) internal pure returns (bool) {
        return choice > 0 && choice < NB_CHOICES + 1;
    }

    function getBadNodeError(
        DaoRegistry dao,
        bytes32 proposalId,
        bool submitNewVote,
        bytes32 resultRoot,
        uint256 blockNumber,
        uint256 gracePeriodStartingTime,
        VoteResultNode memory node
    ) public view returns (BadNodeError) {
        (address adapterAddress, ) = dao.proposals(proposalId);
        require(resultRoot != bytes32(0), "no result available yet!");
        bytes32 hashCurrent = nodeHash(dao, adapterAddress, node);
        //check that the step is indeed part of the result
        require(
            MerkleProof.verify(node.proof, resultRoot, hashCurrent),
            "proof:bad"
        );
        address account = dao.getMemberAddress(node.index);
        //return 1 if yes, 2 if no and 0 if the vote is incorrect
        address voter = dao.getPriorDelegateKey(account, blockNumber);

        (address actionId, ) = dao.proposals(proposalId);

        //invalid choice
        if (
            (node.sig.length == 0 && node.choice != 0) || // no vote
            (node.sig.length > 0 && !_isValidChoice(node.choice))
        ) {
            return BadNodeError.INVALID_CHOICE;
        }

        //invalid proposal hash
        if (node.proposalId != proposalId) {
            return BadNodeError.WRONG_PROPOSAL_ID;
        }

        //has voted outside of the voting time
        if (!submitNewVote && node.timestamp > gracePeriodStartingTime) {
            return BadNodeError.AFTER_VOTING_PERIOD;
        }

        //bad signature
        if (
            node.sig.length > 0 && // a vote has happened
            !_hasVoted(
                dao,
                actionId,
                voter,
                node.timestamp,
                node.proposalId,
                node.choice,
                node.sig
            )
        ) {
            return BadNodeError.BAD_SIGNATURE;
        }

        return BadNodeError.OK;
    }

    function challengeBadStep(
        DaoRegistry dao,
        bytes32 proposalId,
        VoteResultNode memory nodePrevious,
        VoteResultNode memory nodeCurrent
    ) external {
        Voting storage vote = votes[address(dao)][proposalId];
        bytes32 resultRoot = vote.resultRoot;

        (address adapterAddress, ) = dao.proposals(proposalId);
        require(resultRoot != bytes32(0), "no result available yet!");
        bytes32 hashCurrent = nodeHash(dao, adapterAddress, nodeCurrent);
        bytes32 hashPrevious = nodeHash(dao, adapterAddress, nodePrevious);
        require(
            MerkleProof.verify(nodeCurrent.proof, resultRoot, hashCurrent),
            "proof check for current invalid for current node"
        );
        require(
            MerkleProof.verify(nodePrevious.proof, resultRoot, hashPrevious),
            "proof check for previous invalid for previous node"
        );

        require(
            nodeCurrent.index == nodePrevious.index + 1,
            "those nodes are not consecutive"
        );

        (address actionId, ) = dao.proposals(proposalId);
        VoteStepParams memory params =
            VoteStepParams(nodePrevious.nbYes, nodePrevious.nbNo, proposalId);
        if (_checkStep(dao, actionId, nodeCurrent, params)) {
            _challengeResult(dao, proposalId);
        }
    }

    function requestFallback(DaoRegistry dao, bytes32 proposalId)
        external
        onlyMember(dao)
    {
        require(
            votes[address(dao)][proposalId].fallbackVotes[msg.sender] == false,
            "the member has already voted for this vote to fallback"
        );
        votes[address(dao)][proposalId].fallbackVotes[msg.sender] = true;
        votes[address(dao)][proposalId].fallbackVotesCount += 1;

        if (
            _fallbackVotingActivated(
                dao,
                votes[address(dao)][proposalId].fallbackVotesCount
            )
        ) {
            fallbackVoting.startNewVotingForProposal(dao, proposalId, "");
        }
    }

    function _checkStep(
        DaoRegistry dao,
        address actionId,
        VoteResultNode memory node,
        VoteStepParams memory params
    ) internal view returns (bool) {
        Voting storage vote = votes[address(dao)][params.proposalId];
        address account = dao.getMemberAddress(node.index);
        address voter = dao.getPriorDelegateKey(account, vote.snapshot);
        BankExtension bank = BankExtension(dao.getExtensionAddress(BANK));
        uint256 weight = bank.getPriorAmount(account, UNITS, vote.snapshot);

        if (node.choice == 0) {
            if (params.previousYes != node.nbYes) {
                return true;
            } else if (params.previousNo != node.nbNo) {
                return true;
            }
        }

        if (
            _hasVoted(
                dao,
                actionId,
                voter,
                node.timestamp,
                node.proposalId,
                1,
                node.sig
            )
        ) {
            if (params.previousYes + weight != node.nbYes) {
                return true;
            } else if (params.previousNo != node.nbNo) {
                return true;
            }
        }
        if (
            _hasVoted(
                dao,
                actionId,
                voter,
                node.timestamp,
                node.proposalId,
                2,
                node.sig
            )
        ) {
            if (params.previousYes != node.nbYes) {
                return true;
            } else if (params.previousNo + weight != node.nbNo) {
                return true;
            }
        }

        return false;
    }

    function sponsorChallengeProposal(
        DaoRegistry dao,
        bytes32 proposalId,
        address sponsoredBy
    ) external onlyBadReporterAdapter {
        dao.sponsorProposal(proposalId, sponsoredBy, address(this));
    }

    function processChallengeProposal(DaoRegistry dao, bytes32 proposalId)
        external
        onlyBadReporterAdapter
    {
        dao.processProposal(proposalId);
    }

    function _challengeResult(DaoRegistry dao, bytes32 proposalId) internal {
        BankExtension bank = BankExtension(dao.getExtensionAddress(BANK));

        votes[address(dao)][proposalId].isChallenged = true;
        address challengedReporter = votes[address(dao)][proposalId].reporter;
        bytes32 challengeProposalId =
            keccak256(
                abi.encodePacked(
                    proposalId,
                    votes[address(dao)][proposalId].resultRoot
                )
            );

        dao.submitProposal(challengeProposalId);

        uint256 units = bank.balanceOf(challengedReporter, UNITS);

        challengeProposals[address(dao)][
            challengeProposalId
        ] = ProposalChallenge(challengedReporter, units);

        // Burns / subtracts from member's balance the number of units to burn.
        bank.subtractFromBalance(challengedReporter, UNITS, units);
        // Burns / subtracts from member's balance the number of loot to burn.
        // bank.subtractFromBalance(memberToKick, LOOT, kick.lootToBurn);
        bank.addToBalance(challengedReporter, LOOT, units);
    }

    function _hasVoted(
        DaoRegistry dao,
        address actionId,
        address voter,
        uint64 timestamp,
        bytes32 proposalId,
        uint32 choiceIdx,
        bytes memory sig
    ) internal view returns (bool) {
        bytes32 voteHash =
            _snapshotContract.hashVote(
                dao,
                actionId,
                SnapshotProposalContract.VoteMessage(
                    timestamp,
                    SnapshotProposalContract.VotePayload(choiceIdx, proposalId)
                )
            );

        return ECDSA.recover(voteHash, sig) == voter;
    }

    function _stringToUint(string memory s)
        internal
        pure
        returns (bool success, uint256 result)
    {
        bytes memory b = bytes(s);
        result = 0;
        success = false;
        for (uint256 i = 0; i < b.length; i++) {
            if (uint8(b[i]) >= 48 && uint8(b[i]) <= 57) {
                result = result * 10 + (uint8(b[i]) - 48);
                success = true;
            } else {
                result = 0;
                success = false;
                break;
            }
        }
        return (success, result);
    }
}

// File: /Users/davidroon/projects/tribute-contracts/contracts/adapters/voting/SnapshotProposalContract.sol



pragma solidity ^0.8.0;

// SPDX-License-Identifier: MIT

import "../../core/DaoRegistry.sol";
import "../../extensions/bank/Bank.sol";
import "../../core/DaoConstants.sol";
import "../../guards/MemberGuard.sol";
import "../../guards/AdapterGuard.sol";
import "../interfaces/IVoting.sol";
import "./Voting.sol";

/**
MIT License

Copyright (c) 2021 Openlaw

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
 */

contract SnapshotProposalContract {
    string public constant EIP712_DOMAIN =
        "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract,address actionId)";
    string public constant PROPOSAL_MESSAGE_TYPE =
        "Message(uint64 timestamp,bytes32 spaceHash,MessagePayload payload)MessagePayload(bytes32 nameHash,bytes32 bodyHash,string[] choices,uint64 start,uint64 end,string snapshot)";
    string public constant PROPOSAL_PAYLOAD_TYPE =
        "MessagePayload(bytes32 nameHash,bytes32 bodyHash,string[] choices,uint64 start,uint64 end,string snapshot)";
    string public constant VOTE_MESSAGE_TYPE =
        "Message(uint64 timestamp,MessagePayload payload)MessagePayload(uint32 choice,bytes32 proposalId)";
    string public constant VOTE_PAYLOAD_TYPE =
        "MessagePayload(uint32 choice,bytes32 proposalId)";

    bytes32 public constant EIP712_DOMAIN_TYPEHASH =
        keccak256(abi.encodePacked(EIP712_DOMAIN));
    bytes32 public constant PROPOSAL_MESSAGE_TYPEHASH =
        keccak256(abi.encodePacked(PROPOSAL_MESSAGE_TYPE));
    bytes32 public constant PROPOSAL_PAYLOAD_TYPEHASH =
        keccak256(abi.encodePacked(PROPOSAL_PAYLOAD_TYPE));
    bytes32 public constant VOTE_MESSAGE_TYPEHASH =
        keccak256(abi.encodePacked(VOTE_MESSAGE_TYPE));
    bytes32 public constant VOTE_PAYLOAD_TYPEHASH =
        keccak256(abi.encodePacked(VOTE_PAYLOAD_TYPE));

    uint256 public chainId;

    function DOMAIN_SEPARATOR(DaoRegistry dao, address actionId)
        public
        view
        returns (bytes32)
    {
        return
            keccak256(
                abi.encode(
                    EIP712_DOMAIN_TYPEHASH,
                    keccak256("Snapshot Message"), // string name
                    keccak256("4"), // string version
                    chainId, // uint256 chainId
                    address(dao), // address verifyingContract,
                    actionId
                )
            );
    }

    struct ProposalMessage {
        uint256 timestamp;
        bytes32 spaceHash;
        ProposalPayload payload;
        bytes sig;
    }

    struct ProposalPayload {
        bytes32 nameHash;
        bytes32 bodyHash;
        string[] choices;
        uint256 start;
        uint256 end;
        string snapshot;
    }

    struct VoteMessage {
        uint256 timestamp;
        VotePayload payload;
    }

    struct VotePayload {
        uint32 choice;
        bytes32 proposalId;
    }

    constructor(uint256 _chainId) {
        chainId = _chainId;
    }

    function hashMessage(
        DaoRegistry dao,
        address actionId,
        ProposalMessage memory message
    ) public view returns (bytes32) {
        return
            keccak256(
                abi.encodePacked(
                    "\x19\x01",
                    DOMAIN_SEPARATOR(dao, actionId),
                    hashProposalMessage(message)
                )
            );
    }

    function hashProposalMessage(ProposalMessage memory message)
        public
        pure
        returns (bytes32)
    {
        return
            keccak256(
                abi.encode(
                    PROPOSAL_MESSAGE_TYPEHASH,
                    message.timestamp,
                    message.spaceHash,
                    hashProposalPayload(message.payload)
                )
            );
    }

    function hashProposalPayload(ProposalPayload memory payload)
        public
        pure
        returns (bytes32)
    {
        return
            keccak256(
                abi.encode(
                    PROPOSAL_PAYLOAD_TYPEHASH,
                    payload.nameHash,
                    payload.bodyHash,
                    keccak256(abi.encodePacked(toHashArray(payload.choices))),
                    payload.start,
                    payload.end,
                    keccak256(abi.encodePacked(payload.snapshot))
                )
            );
    }

    function hashVote(
        DaoRegistry dao,
        address actionId,
        VoteMessage memory message
    ) public view returns (bytes32) {
        return
            keccak256(
                abi.encodePacked(
                    "\x19\x01",
                    DOMAIN_SEPARATOR(dao, actionId),
                    hashVoteInternal(message)
                )
            );
    }

    function hashVoteInternal(VoteMessage memory message)
        public
        pure
        returns (bytes32)
    {
        return
            keccak256(
                abi.encode(
                    VOTE_MESSAGE_TYPEHASH,
                    message.timestamp,
                    hashVotePayload(message.payload)
                )
            );
    }

    function hashVotePayload(VotePayload memory payload)
        public
        pure
        returns (bytes32)
    {
        return
            keccak256(
                abi.encode(
                    VOTE_PAYLOAD_TYPEHASH,
                    payload.choice,
                    payload.proposalId
                )
            );
    }

    function toHashArray(string[] memory arr)
        internal
        pure
        returns (bytes32[] memory result)
    {
        result = new bytes32[](arr.length);
        for (uint256 i = 0; i < arr.length; i++) {
            result[i] = keccak256(abi.encodePacked(arr[i]));
        }
    }
}

// File: /Users/davidroon/projects/tribute-contracts/contracts/adapters/voting/Voting.sol



pragma solidity ^0.8.0;

// SPDX-License-Identifier: MIT

import "../../core/DaoRegistry.sol";
import "../../core/DaoConstants.sol";
import "../../extensions/bank/Bank.sol";
import "../../guards/MemberGuard.sol";
import "../../guards/AdapterGuard.sol";
import "../interfaces/IVoting.sol";

/**
MIT License

Copyright (c) 2020 Openlaw

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
 */

contract VotingContract is IVoting, DaoConstants, MemberGuard, AdapterGuard {
    struct Voting {
        uint256 nbYes;
        uint256 nbNo;
        uint256 startingTime;
        uint256 blockNumber;
        mapping(address => uint256) votes;
    }

    bytes32 constant VotingPeriod = keccak256("voting.votingPeriod");
    bytes32 constant GracePeriod = keccak256("voting.gracePeriod");

    mapping(address => mapping(bytes32 => Voting)) public votes;

    string public constant ADAPTER_NAME = "VotingContract";

    function getAdapterName() external pure override returns (string memory) {
        return ADAPTER_NAME;
    }

    function configureDao(
        DaoRegistry dao,
        uint256 votingPeriod,
        uint256 gracePeriod
    ) external onlyAdapter(dao) {
        dao.setConfiguration(VotingPeriod, votingPeriod);
        dao.setConfiguration(GracePeriod, gracePeriod);
    }

    //voting  data is not used for pure onchain voting
    function startNewVotingForProposal(
        DaoRegistry dao,
        bytes32 proposalId,
        bytes calldata
    ) external override onlyAdapter(dao) {
        //it is called from Registry
        // compute startingPeriod for proposal

        Voting storage vote = votes[address(dao)][proposalId];
        vote.startingTime = block.timestamp;
        vote.blockNumber = block.number;
    }

    function getSenderAddress(
        DaoRegistry,
        address,
        bytes memory,
        address sender
    ) external pure override returns (address) {
        return sender;
    }

    function submitVote(
        DaoRegistry dao,
        bytes32 proposalId,
        uint256 voteValue
    ) external onlyMember(dao) {
        require(
            dao.getProposalFlag(proposalId, DaoRegistry.ProposalFlag.SPONSORED),
            "the proposal has not been sponsored yet"
        );

        require(
            !dao.getProposalFlag(
                proposalId,
                DaoRegistry.ProposalFlag.PROCESSED
            ),
            "the proposal has already been processed"
        );

        require(
            voteValue < 3 && voteValue > 0,
            "only yes (1) and no (2) are possible values"
        );

        Voting storage vote = votes[address(dao)][proposalId];

        require(
            vote.startingTime > 0,
            "this proposalId has no vote going on at the moment"
        );
        require(
            block.timestamp <
                vote.startingTime + dao.getConfiguration(VotingPeriod),
            "vote has already ended"
        );

        address memberAddr = dao.getAddressIfDelegated(msg.sender);

        require(vote.votes[memberAddr] == 0, "member has already voted");
        BankExtension bank = BankExtension(dao.getExtensionAddress(BANK));
        uint256 correctWeight =
            bank.getPriorAmount(memberAddr, UNITS, vote.blockNumber);

        vote.votes[memberAddr] = voteValue;

        if (voteValue == 1) {
            vote.nbYes = vote.nbYes + correctWeight;
        } else if (voteValue == 2) {
            vote.nbNo = vote.nbNo + correctWeight;
        }
    }

    //Public Functions
    /**
    possible results here:
    0: has not started
    1: tie
    2: pass
    3: not pass
    4: in progress
     */
    function voteResult(DaoRegistry dao, bytes32 proposalId)
        external
        view
        override
        returns (VotingState state)
    {
        Voting storage vote = votes[address(dao)][proposalId];
        if (vote.startingTime == 0) {
            return VotingState.NOT_STARTED;
        }

        if (
            block.timestamp <
            vote.startingTime + dao.getConfiguration(VotingPeriod)
        ) {
            return VotingState.IN_PROGRESS;
        }

        if (
            block.timestamp <
            vote.startingTime +
                dao.getConfiguration(VotingPeriod) +
                dao.getConfiguration(GracePeriod)
        ) {
            return VotingState.GRACE_PERIOD;
        }

        if (vote.nbYes > vote.nbNo) {
            return VotingState.PASS;
        } else if (vote.nbYes < vote.nbNo) {
            return VotingState.NOT_PASS;
        } else {
            return VotingState.TIE;
        }
    }
}

// File: /Users/davidroon/projects/tribute-contracts/contracts/core/DaoConstants.sol



pragma solidity ^0.8.0;

// SPDX-License-Identifier: MIT

/**
MIT License

Copyright (c) 2020 Openlaw

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
 */

abstract contract DaoConstants {
    // Adapters
    bytes32 internal constant VOTING = keccak256("voting");
    bytes32 internal constant ONBOARDING = keccak256("onboarding");
    bytes32 internal constant NONVOTING_ONBOARDING =
        keccak256("nonvoting-onboarding");
    bytes32 internal constant TRIBUTE = keccak256("tribute");
    bytes32 internal constant FINANCING = keccak256("financing");
    bytes32 internal constant MANAGING = keccak256("managing");
    bytes32 internal constant RAGEQUIT = keccak256("ragequit");
    bytes32 internal constant GUILDKICK = keccak256("guildkick");
    bytes32 internal constant EXECUTION = keccak256("execution");
    bytes32 internal constant CONFIGURATION = keccak256("configuration");
    bytes32 internal constant DISTRIBUTE = keccak256("distribute");
    bytes32 internal constant TRIBUTE_NFT = keccak256("tribute-nft");

    // Extensions
    bytes32 internal constant BANK = keccak256("bank");
    bytes32 internal constant NFT = keccak256("nft");
    bytes32 internal constant ERC20_EXT = keccak256("erc20-ext");

    // Reserved Addresses
    address internal constant GUILD = address(0xdead);
    address internal constant TOTAL = address(0xbabe);
    address internal constant ESCROW = address(0x4bec);
    address internal constant UNITS = address(0xFF1CE);
    address internal constant LOOT = address(0xB105F00D);
    address internal constant ETH_TOKEN = address(0x0);
    address internal constant MEMBER_COUNT = address(0xDECAFBAD);

    uint8 internal constant MAX_TOKENS_GUILD_BANK = 200;

    //helper
    function getFlag(uint256 flags, uint256 flag) public pure returns (bool) {
        return (flags >> uint8(flag)) % 2 == 1;
    }

    function setFlag(
        uint256 flags,
        uint256 flag,
        bool value
    ) public pure returns (uint256) {
        if (getFlag(flags, flag) != value) {
            if (value) {
                return flags + 2**flag;
            } else {
                return flags - 2**flag;
            }
        } else {
            return flags;
        }
    }

    /**
     * @notice Checks if a given address is reserved.
     */
    function isNotReservedAddress(address addr) public pure returns (bool) {
        return addr != GUILD && addr != TOTAL && addr != ESCROW;
    }

    /**
     * @notice Checks if a given address is zeroed.
     */
    function isNotZeroAddress(address addr) public pure returns (bool) {
        return addr != address(0x0);
    }
}

// File: /Users/davidroon/projects/tribute-contracts/contracts/core/DaoRegistry.sol



pragma solidity ^0.8.0;

// SPDX-License-Identifier: MIT

import "./DaoConstants.sol";
import "../guards/AdapterGuard.sol";
import "../guards/MemberGuard.sol";
import "../extensions/IExtension.sol";

/**
MIT License

Copyright (c) 2020 Openlaw

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
 */

contract DaoRegistry is MemberGuard, AdapterGuard {
    bool public initialized = false; // internally tracks deployment under eip-1167 proxy pattern

    enum DaoState {CREATION, READY}

    /*
     * EVENTS
     */
    /// @dev - Events for Proposals
    event SubmittedProposal(bytes32 proposalId, uint256 flags);
    event SponsoredProposal(
        bytes32 proposalId,
        uint256 flags,
        address votingAdapter
    );
    event ProcessedProposal(bytes32 proposalId, uint256 flags);
    event AdapterAdded(
        bytes32 adapterId,
        address adapterAddress,
        uint256 flags
    );
    event AdapterRemoved(bytes32 adapterId);

    event ExtensionAdded(bytes32 extensionId, address extensionAddress);
    event ExtensionRemoved(bytes32 extensionId);

    /// @dev - Events for Members
    event UpdateDelegateKey(address memberAddress, address newDelegateKey);
    event ConfigurationUpdated(bytes32 key, uint256 value);
    event AddressConfigurationUpdated(bytes32 key, address value);

    enum MemberFlag {EXISTS}

    enum ProposalFlag {EXISTS, SPONSORED, PROCESSED}

    enum AclFlag {
        REPLACE_ADAPTER,
        SUBMIT_PROPOSAL,
        UPDATE_DELEGATE_KEY,
        SET_CONFIGURATION,
        ADD_EXTENSION,
        REMOVE_EXTENSION,
        NEW_MEMBER
    }

    /*
     * STRUCTURES
     */
    struct Proposal {
        // the structure to track all the proposals in the DAO
        address adapterAddress; // the adapter address that called the functions to change the DAO state
        uint256 flags; // flags to track the state of the proposal: exist, sponsored, processed, canceled, etc.
    }

    struct Member {
        // the structure to track all the members in the DAO
        uint256 flags; // flags to track the state of the member: exists, etc
    }

    struct Checkpoint {
        // A checkpoint for marking number of votes from a given block
        uint96 fromBlock;
        uint160 amount;
    }

    struct DelegateCheckpoint {
        // A checkpoint for marking number of votes from a given block
        uint96 fromBlock;
        address delegateKey;
    }

    struct AdapterEntry {
        bytes32 id;
        uint256 acl;
    }

    struct ExtensionEntry {
        bytes32 id;
        mapping(address => uint256) acl;
    }

    /*
     * PUBLIC VARIABLES
     */
    mapping(address => Member) public members; // the map to track all members of the DAO
    address[] private _members;

    // delegate key => member address mapping
    mapping(address => address) public memberAddressesByDelegatedKey;

    // memberAddress => checkpointNum => DelegateCheckpoint
    mapping(address => mapping(uint32 => DelegateCheckpoint)) checkpoints;
    // memberAddress => numDelegateCheckpoints
    mapping(address => uint32) numCheckpoints;

    DaoState public state;

    /// @notice The map that keeps track of all proposasls submitted to the DAO
    mapping(bytes32 => Proposal) public proposals;
    /// @notice The map that tracks the voting adapter address per proposalId
    mapping(bytes32 => address) public votingAdapter;
    /// @notice The map that keeps track of all adapters registered in the DAO
    mapping(bytes32 => address) public adapters;
    /// @notice The inverse map to get the adapter id based on its address
    mapping(address => AdapterEntry) public inverseAdapters;
    /// @notice The map that keeps track of all extensions registered in the DAO
    mapping(bytes32 => address) public extensions;
    /// @notice The inverse map to get the extension id based on its address
    mapping(address => ExtensionEntry) public inverseExtensions;
    /// @notice The map that keeps track of configuration parameters for the DAO and adapters
    mapping(bytes32 => uint256) public mainConfiguration;
    mapping(bytes32 => address) public addressConfiguration;

    uint256 public lockedAt;

    /// @notice Clonable contract must have an empty constructor
    // constructor() {
    // }

    /**
     * @notice Initialises the DAO
     * @dev Involves initialising available tokens, checkpoints, and membership of creator
     * @dev Can only be called once
     * @param creator The DAO's creator, who will be an initial member
     * @param payer The account which paid for the transaction to create the DAO, who will be an initial member
     */
    function initialize(address creator, address payer) external {
        require(!initialized, "dao already initialized");
        potentialNewMember(msg.sender);
        potentialNewMember(payer);
        potentialNewMember(creator);

        initialized = true;
    }

    /**
     * @notice default fallback function to prevent from sending ether to the contract
     */
    receive() external payable {
        revert("you cannot send money back directly");
    }

    /**
     * @dev Sets the state of the dao to READY
     */
    function finalizeDao() external {
        state = DaoState.READY;
    }

    function lockSession() external {
        if (isAdapter(msg.sender) || isExtension(msg.sender)) {
            lockedAt = block.number;
        }
    }

    function unlockSession() external {
        if (isAdapter(msg.sender) || isExtension(msg.sender)) {
            lockedAt = 0;
        }
    }

    /**
     * @notice Sets a configuration value
     * @dev Changes the value of a key in the configuration mapping
     * @param key The configuration key for which the value will be set
     * @param value The value to set the key
     */
    function setConfiguration(bytes32 key, uint256 value)
        external
        hasAccess(this, AclFlag.SET_CONFIGURATION)
    {
        mainConfiguration[key] = value;

        emit ConfigurationUpdated(key, value);
    }

    function potentialNewMember(address memberAddress)
        public
        hasAccess(this, AclFlag.NEW_MEMBER)
    {
        require(memberAddress != address(0x0), "invalid member address");

        Member storage member = members[memberAddress];
        if (!getFlag(member.flags, uint8(MemberFlag.EXISTS))) {
            require(
                memberAddressesByDelegatedKey[memberAddress] == address(0x0),
                "member address already taken as delegated key"
            );
            member.flags = setFlag(
                member.flags,
                uint8(MemberFlag.EXISTS),
                true
            );
            memberAddressesByDelegatedKey[memberAddress] = memberAddress;
            _members.push(memberAddress);
        }

        address bankAddress = extensions[BANK];
        if (bankAddress != address(0x0)) {
            BankExtension bank = BankExtension(bankAddress);
            if (bank.balanceOf(memberAddress, MEMBER_COUNT) == 0) {
                bank.addToBalance(memberAddress, MEMBER_COUNT, 1);
            }
        }
    }

    /**
     * @notice Sets an configuration value
     * @dev Changes the value of a key in the configuration mapping
     * @param key The configuration key for which the value will be set
     * @param value The value to set the key
     */
    function setAddressConfiguration(bytes32 key, address value)
        external
        hasAccess(this, AclFlag.SET_CONFIGURATION)
    {
        addressConfiguration[key] = value;

        emit AddressConfigurationUpdated(key, value);
    }

    /**
     * @return The configuration value of a particular key
     * @param key The key to look up in the configuration mapping
     */
    function getConfiguration(bytes32 key) external view returns (uint256) {
        return mainConfiguration[key];
    }

    /**
     * @return The configuration value of a particular key
     * @param key The key to look up in the configuration mapping
     */
    function getAddressConfiguration(bytes32 key)
        external
        view
        returns (address)
    {
        return addressConfiguration[key];
    }

    /**
     * @notice Adds a new extension to the registry
     * @param extensionId The unique identifier of the new extension
     * @param extension The address of the extension
     * @param creator The DAO's creator, who will be an initial member
     */
    function addExtension(
        bytes32 extensionId,
        IExtension extension,
        address creator
    ) external hasAccess(this, AclFlag.ADD_EXTENSION) {
        require(extensionId != bytes32(0), "extension id must not be empty");
        require(
            extensions[extensionId] == address(0x0),
            "extension Id already in use"
        );
        extensions[extensionId] = address(extension);
        inverseExtensions[address(extension)].id = extensionId;
        extension.initialize(this, creator);
        emit ExtensionAdded(extensionId, address(extension));
    }

    function setAclToExtensionForAdapter(
        address extensionAddress,
        address adapterAddress,
        uint256 acl
    ) external hasAccess(this, AclFlag.ADD_EXTENSION) {
        require(isAdapter(adapterAddress), "not an adapter");
        require(isExtension(extensionAddress), "not an extension");
        inverseExtensions[extensionAddress].acl[adapterAddress] = acl;
    }

    /**
     * @notice Replaces an adapter in the registry in a single step.
     * @notice It handles addition and removal of adapters as special cases.
     * @dev It removes the current adapter if the adapterId maps to an existing adapter address.
     * @dev It adds an adapter if the adapterAddress parameter is not zeroed.
     * @param adapterId The unique identifier of the adapter
     * @param adapterAddress The address of the new adapter or zero if it is a removal operation
     * @param acl The flags indicating the access control layer or permissions of the new adapter
     * @param keys The keys indicating the adapter configuration names.
     * @param values The values indicating the adapter configuration values.
     */
    function replaceAdapter(
        bytes32 adapterId,
        address adapterAddress,
        uint128 acl,
        bytes32[] calldata keys,
        uint256[] calldata values
    ) external hasAccess(this, AclFlag.REPLACE_ADAPTER) {
        require(adapterId != bytes32(0), "adapterId must not be empty");

        address currentAdapterAddr = adapters[adapterId];
        if (currentAdapterAddr != address(0x0)) {
            delete inverseAdapters[currentAdapterAddr];
            delete adapters[adapterId];
            emit AdapterRemoved(adapterId);
        }

        for (uint256 i = 0; i < keys.length; i++) {
            bytes32 key = keys[i];
            uint256 value = values[i];
            mainConfiguration[key] = value;
            emit ConfigurationUpdated(key, value);
        }

        if (adapterAddress != address(0x0)) {
            require(
                inverseAdapters[adapterAddress].id == bytes32(0),
                "adapterAddress already in use"
            );
            adapters[adapterId] = adapterAddress;
            inverseAdapters[adapterAddress].id = adapterId;
            inverseAdapters[adapterAddress].acl = acl;
            emit AdapterAdded(adapterId, adapterAddress, acl);
        }
    }

    /**
     * @notice Removes an adapter from the registry
     * @param extensionId The unique identifier of the extension
     */
    function removeExtension(bytes32 extensionId)
        external
        hasAccess(this, AclFlag.REMOVE_EXTENSION)
    {
        require(extensionId != bytes32(0), "extensionId must not be empty");
        require(
            extensions[extensionId] != address(0x0),
            "extensionId not registered"
        );
        delete inverseExtensions[extensions[extensionId]];
        delete extensions[extensionId];
        emit ExtensionRemoved(extensionId);
    }

    /**
     * @notice Looks up if there is an extension of a given address
     * @return Whether or not the address is an extension
     * @param extensionAddr The address to look up
     */
    function isExtension(address extensionAddr) public view returns (bool) {
        return inverseExtensions[extensionAddr].id != bytes32(0);
    }

    /**
     * @notice Looks up if there is an adapter of a given address
     * @return Whether or not the address is an adapter
     * @param adapterAddress The address to look up
     */
    function isAdapter(address adapterAddress) public view returns (bool) {
        return inverseAdapters[adapterAddress].id != bytes32(0);
    }

    /**
     * @notice Checks if an adapter has a given ACL flag
     * @return Whether or not the given adapter has the given flag set
     * @param adapterAddress The address to look up
     * @param flag The ACL flag to check against the given address
     */
    function hasAdapterAccess(address adapterAddress, AclFlag flag)
        public
        view
        returns (bool)
    {
        return getFlag(inverseAdapters[adapterAddress].acl, uint8(flag));
    }

    /**
     * @notice Checks if an adapter has a given ACL flag
     * @return Whether or not the given adapter has the given flag set
     * @param adapterAddress The address to look up
     * @param flag The ACL flag to check against the given address
     */
    function hasAdapterAccessToExtension(
        address adapterAddress,
        address extensionAddress,
        uint8 flag
    ) public view returns (bool) {
        return
            isAdapter(adapterAddress) &&
            getFlag(
                inverseExtensions[extensionAddress].acl[adapterAddress],
                uint8(flag)
            );
    }

    /**
     * @return The address of a given adapter ID
     * @param adapterId The ID to look up
     */
    function getAdapterAddress(bytes32 adapterId)
        external
        view
        returns (address)
    {
        require(adapters[adapterId] != address(0), "adapter not found");
        return adapters[adapterId];
    }

    /**
     * @return The address of a given extension Id
     * @param extensionId The ID to look up
     */
    function getExtensionAddress(bytes32 extensionId)
        external
        view
        returns (address)
    {
        require(extensions[extensionId] != address(0), "extension not found");
        return extensions[extensionId];
    }

    /**
     * PROPOSALS
     */
    /**
     * @notice Submit proposals to the DAO registry
     */
    function submitProposal(bytes32 proposalId)
        public
        hasAccess(this, AclFlag.SUBMIT_PROPOSAL)
    {
        require(proposalId != bytes32(0), "invalid proposalId");
        require(
            !getProposalFlag(proposalId, ProposalFlag.EXISTS),
            "proposalId must be unique"
        );
        proposals[proposalId] = Proposal(msg.sender, 1); // 1 means that only the first flag is being set i.e. EXISTS
        emit SubmittedProposal(proposalId, 1);
    }

    /**
     * @notice Sponsor proposals that were submitted to the DAO registry
     * @dev adds SPONSORED to the proposal flag
     * @param proposalId The ID of the proposal to sponsor
     * @param sponsoringMember The member who is sponsoring the proposal
     */
    function sponsorProposal(
        bytes32 proposalId,
        address sponsoringMember,
        address votingAdapterAddr
    ) external onlyMember2(this, sponsoringMember) {
        // also checks if the flag was already set
        Proposal storage proposal =
            _setProposalFlag(proposalId, ProposalFlag.SPONSORED);

        uint256 flags = proposal.flags;

        require(
            proposal.adapterAddress == msg.sender,
            "only the adapter that submitted the proposal can process it"
        );

        require(
            !getFlag(flags, uint8(ProposalFlag.PROCESSED)),
            "proposal already processed"
        );
        votingAdapter[proposalId] = votingAdapterAddr;
        emit SponsoredProposal(proposalId, flags, votingAdapterAddr);
    }

    /**
     * @notice Mark a proposal as processed in the DAO registry
     * @param proposalId The ID of the proposal that is being processed
     */
    function processProposal(bytes32 proposalId) external {
        Proposal storage proposal =
            _setProposalFlag(proposalId, ProposalFlag.PROCESSED);

        require(proposal.adapterAddress == msg.sender, "err::adapter mismatch");
        uint256 flags = proposal.flags;

        emit ProcessedProposal(proposalId, flags);
    }

    /**
     * @notice Sets a flag of a proposal
     * @dev Reverts if the proposal is already processed
     * @param proposalId The ID of the proposal to be changed
     * @param flag The flag that will be set on the proposal
     */
    function _setProposalFlag(bytes32 proposalId, ProposalFlag flag)
        internal
        returns (Proposal storage)
    {
        Proposal storage proposal = proposals[proposalId];

        uint256 flags = proposal.flags;
        require(
            getFlag(flags, uint8(ProposalFlag.EXISTS)),
            "proposal does not exist for this dao"
        );

        require(
            proposal.adapterAddress == msg.sender,
            "only the adapter that submitted the proposal can set its flag"
        );

        require(!getFlag(flags, uint8(flag)), "flag already set");

        flags = setFlag(flags, uint8(flag), true);
        proposals[proposalId].flags = flags;

        return proposals[proposalId];
    }

    /*
     * MEMBERS
     */

    /**
     * @return Whether or not a given address is a member of the DAO.
     * @dev it will resolve by delegate key, not member address.
     * @param addr The address to look up
     */
    function isMember(address addr) public view returns (bool) {
        address memberAddress = memberAddressesByDelegatedKey[addr];
        return getMemberFlag(memberAddress, MemberFlag.EXISTS);
    }

    /**
     * @return Whether or not a flag is set for a given proposal
     * @param proposalId The proposal to check against flag
     * @param flag The flag to check in the proposal
     */
    function getProposalFlag(bytes32 proposalId, ProposalFlag flag)
        public
        view
        returns (bool)
    {
        return getFlag(proposals[proposalId].flags, uint8(flag));
    }

    /**
     * @return Whether or not a flag is set for a given member
     * @param memberAddress The member to check against flag
     * @param flag The flag to check in the member
     */
    function getMemberFlag(address memberAddress, MemberFlag flag)
        public
        view
        returns (bool)
    {
        return getFlag(members[memberAddress].flags, uint8(flag));
    }

    function getNbMembers() public view returns (uint256) {
        return _members.length;
    }

    function getMemberAddress(uint256 index) public view returns (address) {
        return _members[index];
    }

    /**
     * @notice Updates the delegate key of a member
     * @param memberAddr The member doing the delegation
     * @param newDelegateKey The member who is being delegated to
     */
    function updateDelegateKey(address memberAddr, address newDelegateKey)
        external
        hasAccess(this, AclFlag.UPDATE_DELEGATE_KEY)
    {
        require(newDelegateKey != address(0x0), "newDelegateKey cannot be 0");

        // skip checks if member is setting the delegate key to their member address
        if (newDelegateKey != memberAddr) {
            require(
                // newDelegate must not be delegated to
                memberAddressesByDelegatedKey[newDelegateKey] == address(0x0),
                "cannot overwrite existing delegated keys"
            );
        } else {
            require(
                memberAddressesByDelegatedKey[memberAddr] == address(0x0),
                "address already taken as delegated key"
            );
        }

        Member storage member = members[memberAddr];
        require(
            getFlag(member.flags, uint8(MemberFlag.EXISTS)),
            "member does not exist"
        );

        // Reset the delegation of the previous delegate
        memberAddressesByDelegatedKey[
            getCurrentDelegateKey(memberAddr)
        ] = address(0x0);

        memberAddressesByDelegatedKey[newDelegateKey] = memberAddr;

        _createNewDelegateCheckpoint(memberAddr, newDelegateKey);
        emit UpdateDelegateKey(memberAddr, newDelegateKey);
    }

    /**
     * Public read-only functions
     */

    /**
     * @param checkAddr The address to check for a delegate
     * @return the delegated address or the checked address if it is not a delegate
     */
    function getAddressIfDelegated(address checkAddr)
        public
        view
        returns (address)
    {
        address delegatedKey = memberAddressesByDelegatedKey[checkAddr];
        return delegatedKey == address(0x0) ? checkAddr : delegatedKey;
    }

    /**
     * @param memberAddr The member whose delegate will be returned
     * @return the delegate key at the current time for a member
     */
    function getCurrentDelegateKey(address memberAddr)
        public
        view
        returns (address)
    {
        uint32 nCheckpoints = numCheckpoints[memberAddr];
        return
            nCheckpoints > 0
                ? checkpoints[memberAddr][nCheckpoints - 1].delegateKey
                : memberAddr;
    }

    /**
     * @param memberAddr The member address to look up
     * @return The delegate key address for memberAddr at the second last checkpoint number
     */
    function getPreviousDelegateKey(address memberAddr)
        public
        view
        returns (address)
    {
        uint32 nCheckpoints = numCheckpoints[memberAddr];
        return
            nCheckpoints > 1
                ? checkpoints[memberAddr][nCheckpoints - 2].delegateKey
                : memberAddr;
    }

    /**
     * @notice Determine the prior number of votes for an account as of a block number
     * @dev Block number must be a finalized block or else this function will revert to prevent misinformation.
     * @param memberAddr The address of the account to check
     * @param blockNumber The block number to get the vote balance at
     * @return The number of votes the account had as of the given block
     */
    function getPriorDelegateKey(address memberAddr, uint256 blockNumber)
        external
        view
        returns (address)
    {
        require(
            blockNumber < block.number,
            "Uni::getPriorDelegateKey: not yet determined"
        );

        uint32 nCheckpoints = numCheckpoints[memberAddr];
        if (nCheckpoints == 0) {
            return memberAddr;
        }

        // First check most recent balance
        if (
            checkpoints[memberAddr][nCheckpoints - 1].fromBlock <= blockNumber
        ) {
            return checkpoints[memberAddr][nCheckpoints - 1].delegateKey;
        }

        // Next check implicit zero balance
        if (checkpoints[memberAddr][0].fromBlock > blockNumber) {
            return memberAddr;
        }

        uint32 lower = 0;
        uint32 upper = nCheckpoints - 1;
        while (upper > lower) {
            uint32 center = upper - (upper - lower) / 2; // ceil, avoiding overflow
            DelegateCheckpoint memory cp = checkpoints[memberAddr][center];
            if (cp.fromBlock == blockNumber) {
                return cp.delegateKey;
            } else if (cp.fromBlock < blockNumber) {
                lower = center;
            } else {
                upper = center - 1;
            }
        }
        return checkpoints[memberAddr][lower].delegateKey;
    }

    /**
     * @notice Creates a new delegate checkpoint of a certain member
     * @param member The member whose delegate checkpoints will be added to
     * @param newDelegateKey The delegate key that will be written into the new checkpoint
     */
    function _createNewDelegateCheckpoint(
        address member,
        address newDelegateKey
    ) internal {
        uint32 nCheckpoints = numCheckpoints[member];
        if (
            nCheckpoints > 0 &&
            checkpoints[member][nCheckpoints - 1].fromBlock == block.number
        ) {
            checkpoints[member][nCheckpoints - 1].delegateKey = newDelegateKey;
        } else {
            checkpoints[member][nCheckpoints] = DelegateCheckpoint(
                uint96(block.number),
                newDelegateKey
            );
            numCheckpoints[member] = nCheckpoints + 1;
        }
    }
}

// File: /Users/davidroon/projects/tribute-contracts/contracts/extensions/IExtension.sol



pragma solidity ^0.8.0;
import "../core/DaoRegistry.sol";

// SPDX-License-Identifier: MIT

/**
MIT License

Copyright (c) 2020 Openlaw

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
 */

interface IExtension {
    function initialize(DaoRegistry dao, address creator) external;
}

// File: /Users/davidroon/projects/tribute-contracts/contracts/extensions/bank/Bank.sol



pragma solidity ^0.8.0;

// SPDX-License-Identifier: MIT

import "../../core/DaoConstants.sol";
import "../../core/DaoRegistry.sol";
import "../IExtension.sol";
import "../../guards/AdapterGuard.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

/**
MIT License

Copyright (c) 2020 Openlaw

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
 */

contract BankExtension is DaoConstants, AdapterGuard, IExtension {
    using Address for address payable;
    using SafeERC20 for IERC20;

    uint8 public maxExternalTokens; // the maximum number of external tokens that can be stored in the bank

    bool public initialized = false; // internally tracks deployment under eip-1167 proxy pattern
    DaoRegistry public dao;

    enum AclFlag {
        ADD_TO_BALANCE,
        SUB_FROM_BALANCE,
        INTERNAL_TRANSFER,
        WITHDRAW,
        EXECUTE,
        REGISTER_NEW_TOKEN,
        REGISTER_NEW_INTERNAL_TOKEN,
        UPDATE_TOKEN
    }

    modifier noProposal {
        require(dao.lockedAt() < block.number, "proposal lock");
        _;
    }

    /// @dev - Events for Bank
    event NewBalance(address member, address tokenAddr, uint160 amount);

    event Withdraw(address account, address tokenAddr, uint160 amount);

    /*
     * STRUCTURES
     */

    struct Checkpoint {
        // A checkpoint for marking number of votes from a given block
        uint96 fromBlock;
        uint160 amount;
    }

    address[] public tokens;
    address[] public internalTokens;
    // tokenAddress => availability
    mapping(address => bool) public availableTokens;
    mapping(address => bool) public availableInternalTokens;
    // tokenAddress => memberAddress => checkpointNum => Checkpoint
    mapping(address => mapping(address => mapping(uint32 => Checkpoint)))
        public checkpoints;
    // tokenAddress => memberAddress => numCheckpoints
    mapping(address => mapping(address => uint32)) public numCheckpoints;

    /// @notice Clonable contract must have an empty constructor
    // constructor() {
    // }

    modifier hasExtensionAccess(AclFlag flag) {
        require(
            address(this) == msg.sender ||
                address(dao) == msg.sender ||
                dao.state() == DaoRegistry.DaoState.CREATION ||
                dao.hasAdapterAccessToExtension(
                    msg.sender,
                    address(this),
                    uint8(flag)
                ),
            "bank::accessDenied"
        );
        _;
    }

    /**
     * @notice Initialises the DAO
     * @dev Involves initialising available tokens, checkpoints, and membership of creator
     * @dev Can only be called once
     * @param creator The DAO's creator, who will be an initial member
     */
    function initialize(DaoRegistry _dao, address creator) external override {
        require(!initialized, "bank already initialized");
        require(_dao.isMember(creator), "bank::not member");
        dao = _dao;
        initialized = true;

        availableInternalTokens[UNITS] = true;
        internalTokens.push(UNITS);

        availableInternalTokens[MEMBER_COUNT] = true;
        internalTokens.push(MEMBER_COUNT);
        uint256 nbMembers = _dao.getNbMembers();
        for (uint256 i = 0; i < nbMembers; i++) {
            addToBalance(_dao.getMemberAddress(i), MEMBER_COUNT, 1);
        }

        _createNewAmountCheckpoint(creator, UNITS, 1);
        _createNewAmountCheckpoint(TOTAL, UNITS, 1);
    }

    function withdraw(
        address payable member,
        address tokenAddr,
        uint256 amount
    ) external hasExtensionAccess(AclFlag.WITHDRAW) {
        require(
            balanceOf(member, tokenAddr) >= amount,
            "bank::withdraw::not enough funds"
        );
        subtractFromBalance(member, tokenAddr, amount);
        if (tokenAddr == ETH_TOKEN) {
            member.sendValue(amount);
        } else {
            IERC20 erc20 = IERC20(tokenAddr);
            erc20.safeTransfer(member, amount);
        }

        emit Withdraw(member, tokenAddr, uint160(amount));
    }

    /**
     * @return Whether or not the given token is an available internal token in the bank
     * @param token The address of the token to look up
     */
    function isInternalToken(address token) external view returns (bool) {
        return availableInternalTokens[token];
    }

    /**
     * @return Whether or not the given token is an available token in the bank
     * @param token The address of the token to look up
     */
    function isTokenAllowed(address token) public view returns (bool) {
        return availableTokens[token];
    }

    /**
     * @notice Sets the maximum amount of external tokens allowed in the bank
     * @param maxTokens The maximum amount of token allowed
     */
    function setMaxExternalTokens(uint8 maxTokens) external {
        require(!initialized, "bank already initialized");
        require(
            maxTokens > 0 && maxTokens <= MAX_TOKENS_GUILD_BANK,
            "max number of external tokens should be (0,200)"
        );
        maxExternalTokens = maxTokens;
    }

    /*
     * BANK
     */

    /**
     * @notice Registers a potential new token in the bank
     * @dev Can not be a reserved token or an available internal token
     * @param token The address of the token
     */
    function registerPotentialNewToken(address token)
        external
        hasExtensionAccess(AclFlag.REGISTER_NEW_TOKEN)
    {
        require(isNotReservedAddress(token), "reservedToken");
        require(!availableInternalTokens[token], "internalToken");
        require(
            tokens.length <= maxExternalTokens,
            "exceeds the maximum tokens allowed"
        );

        if (!availableTokens[token]) {
            availableTokens[token] = true;
            tokens.push(token);
        }
    }

    /**
     * @notice Registers a potential new internal token in the bank
     * @dev Can not be a reserved token or an available token
     * @param token The address of the token
     */
    function registerPotentialNewInternalToken(address token)
        external
        hasExtensionAccess(AclFlag.REGISTER_NEW_INTERNAL_TOKEN)
    {
        require(isNotReservedAddress(token), "reservedToken");
        require(!availableTokens[token], "availableToken");

        if (!availableInternalTokens[token]) {
            availableInternalTokens[token] = true;
            internalTokens.push(token);
        }
    }

    function updateToken(address tokenAddr)
        external
        hasExtensionAccess(AclFlag.UPDATE_TOKEN)
    {
        require(isTokenAllowed(tokenAddr), "token not allowed");
        uint256 totalBalance = balanceOf(TOTAL, tokenAddr);

        uint256 realBalance;

        if (tokenAddr == ETH_TOKEN) {
            realBalance = address(this).balance;
        } else {
            IERC20 erc20 = IERC20(tokenAddr);
            realBalance = erc20.balanceOf(address(this));
        }

        if (totalBalance < realBalance) {
            addToBalance(GUILD, tokenAddr, realBalance - totalBalance);
        } else if (totalBalance > realBalance) {
            uint256 tokensToRemove = totalBalance - realBalance;
            uint256 guildBalance = balanceOf(GUILD, tokenAddr);
            if (guildBalance > tokensToRemove) {
                subtractFromBalance(GUILD, tokenAddr, tokensToRemove);
            } else {
                subtractFromBalance(GUILD, tokenAddr, guildBalance);
            }
        }
    }

    /**
     * Public read-only functions
     */

    /**
     * Internal bookkeeping
     */

    /**
     * @return The token from the bank of a given index
     * @param index The index to look up in the bank's tokens
     */
    function getToken(uint256 index) external view returns (address) {
        return tokens[index];
    }

    /**
     * @return The amount of token addresses in the bank
     */
    function nbTokens() external view returns (uint256) {
        return tokens.length;
    }

    /**
     * @return All the tokens registered in the bank.
     */
    function getTokens() external view returns (address[] memory) {
        return tokens;
    }

    /**
     * @return The internal token at a given index
     * @param index The index to look up in the bank's array of internal tokens
     */
    function getInternalToken(uint256 index) external view returns (address) {
        return internalTokens[index];
    }

    /**
     * @return The amount of internal token addresses in the bank
     */
    function nbInternalTokens() external view returns (uint256) {
        return internalTokens.length;
    }

    /**
     * @notice Adds to a member's balance of a given token
     * @param member The member whose balance will be updated
     * @param token The token to update
     * @param amount The new balance
     */
    function addToBalance(
        address member,
        address token,
        uint256 amount
    ) public payable hasExtensionAccess(AclFlag.ADD_TO_BALANCE) {
        require(
            availableTokens[token] || availableInternalTokens[token],
            "unknown token address"
        );
        uint256 newAmount = balanceOf(member, token) + amount;
        uint256 newTotalAmount = balanceOf(TOTAL, token) + amount;

        _createNewAmountCheckpoint(member, token, newAmount);
        _createNewAmountCheckpoint(TOTAL, token, newTotalAmount);
    }

    /**
     * @notice Remove from a member's balance of a given token
     * @param member The member whose balance will be updated
     * @param token The token to update
     * @param amount The new balance
     */
    function subtractFromBalance(
        address member,
        address token,
        uint256 amount
    ) public hasExtensionAccess(AclFlag.SUB_FROM_BALANCE) {
        uint256 newAmount = balanceOf(member, token) - amount;
        uint256 newTotalAmount = balanceOf(TOTAL, token) - amount;

        _createNewAmountCheckpoint(member, token, newAmount);
        _createNewAmountCheckpoint(TOTAL, token, newTotalAmount);
    }

    /**
     * @notice Make an internal token transfer
     * @param from The member who is sending tokens
     * @param to The member who is receiving tokens
     * @param amount The new amount to transfer
     */
    function internalTransfer(
        address from,
        address to,
        address token,
        uint256 amount
    ) public hasExtensionAccess(AclFlag.INTERNAL_TRANSFER) {
        uint256 newAmount = balanceOf(from, token) - amount;
        uint256 newAmount2 = balanceOf(to, token) + amount;

        _createNewAmountCheckpoint(from, token, newAmount);
        _createNewAmountCheckpoint(to, token, newAmount2);
    }

    /**
     * @notice Returns an member's balance of a given token
     * @param member The address to look up
     * @param tokenAddr The token where the member's balance of which will be returned
     * @return The amount in account's tokenAddr balance
     */
    function balanceOf(address member, address tokenAddr)
        public
        view
        returns (uint160)
    {
        uint32 nCheckpoints = numCheckpoints[tokenAddr][member];
        return
            nCheckpoints > 0
                ? checkpoints[tokenAddr][member][nCheckpoints - 1].amount
                : 0;
    }

    /**
     * @notice Determine the prior number of votes for an account as of a block number
     * @dev Block number must be a finalized block or else this function will revert to prevent misinformation.
     * @param account The address of the account to check
     * @param blockNumber The block number to get the vote balance at
     * @return The number of votes the account had as of the given block
     */
    function getPriorAmount(
        address account,
        address tokenAddr,
        uint256 blockNumber
    ) external view returns (uint256) {
        require(
            blockNumber < block.number,
            "Uni::getPriorAmount: not yet determined"
        );

        uint32 nCheckpoints = numCheckpoints[tokenAddr][account];
        if (nCheckpoints == 0) {
            return 0;
        }

        // First check most recent balance
        if (
            checkpoints[tokenAddr][account][nCheckpoints - 1].fromBlock <=
            blockNumber
        ) {
            return checkpoints[tokenAddr][account][nCheckpoints - 1].amount;
        }

        // Next check implicit zero balance
        if (checkpoints[tokenAddr][account][0].fromBlock > blockNumber) {
            return 0;
        }

        uint32 lower = 0;
        uint32 upper = nCheckpoints - 1;
        while (upper > lower) {
            uint32 center = upper - (upper - lower) / 2; // ceil, avoiding overflow
            Checkpoint memory cp = checkpoints[tokenAddr][account][center];
            if (cp.fromBlock == blockNumber) {
                return cp.amount;
            } else if (cp.fromBlock < blockNumber) {
                lower = center;
            } else {
                upper = center - 1;
            }
        }
        return checkpoints[tokenAddr][account][lower].amount;
    }

    /**
     * @notice Creates a new amount checkpoint for a token of a certain member
     * @dev Reverts if the amount is greater than 2**64-1
     * @param member The member whose checkpoints will be added to
     * @param token The token of which the balance will be changed
     * @param amount The amount to be written into the new checkpoint
     */
    function _createNewAmountCheckpoint(
        address member,
        address token,
        uint256 amount
    ) internal {
        bool isValidToken = false;
        if (availableInternalTokens[token]) {
            require(
                amount < type(uint88).max,
                "token amount exceeds the maximum limit for internal tokens"
            );
            isValidToken = true;
        } else if (availableTokens[token]) {
            require(
                amount < type(uint160).max,
                "token amount exceeds the maximum limit for external tokens"
            );
            isValidToken = true;
        }
        uint160 newAmount = uint160(amount);

        require(isValidToken, "token not registered");

        uint32 nCheckpoints = numCheckpoints[token][member];
        if (
            nCheckpoints > 0 &&
            checkpoints[token][member][nCheckpoints - 1].fromBlock ==
            block.number
        ) {
            checkpoints[token][member][nCheckpoints - 1].amount = newAmount;
        } else {
            checkpoints[token][member][nCheckpoints] = Checkpoint(
                uint96(block.number),
                newAmount
            );
            numCheckpoints[token][member] = nCheckpoints + 1;
        }
        emit NewBalance(member, token, newAmount);
    }
}

// File: /Users/davidroon/projects/tribute-contracts/contracts/guards/AdapterGuard.sol



pragma solidity ^0.8.0;

// SPDX-License-Identifier: MIT

import "../core/DaoRegistry.sol";
import "../extensions/IExtension.sol";

/**
MIT License

Copyright (c) 2020 Openlaw

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
 */
abstract contract AdapterGuard {
    /**
     * @dev Only registered adapters are allowed to execute the function call.
     */
    modifier onlyAdapter(DaoRegistry dao) {
        require(
            (dao.state() == DaoRegistry.DaoState.CREATION &&
                creationModeCheck(dao)) || dao.isAdapter(msg.sender),
            "onlyAdapter"
        );
        _;
    }

    modifier reentrancyGuard(DaoRegistry dao) {
        require(dao.lockedAt() != block.number, "reentrancy guard");
        dao.lockSession();
        _;
        dao.unlockSession();
    }

    modifier hasAccess(DaoRegistry dao, DaoRegistry.AclFlag flag) {
        require(
            (dao.state() == DaoRegistry.DaoState.CREATION &&
                creationModeCheck(dao)) ||
                dao.hasAdapterAccess(msg.sender, flag),
            "accessDenied"
        );
        _;
    }

    function creationModeCheck(DaoRegistry dao) internal view returns (bool) {
        return
            dao.getNbMembers() == 0 ||
            dao.isMember(msg.sender) ||
            dao.isAdapter(msg.sender);
    }
}

// File: /Users/davidroon/projects/tribute-contracts/contracts/guards/MemberGuard.sol



pragma solidity ^0.8.0;

// SPDX-License-Identifier: MIT

import "../core/DaoRegistry.sol";
import "../extensions/bank/Bank.sol";

/**
MIT License

Copyright (c) 2020 Openlaw

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
 */
abstract contract MemberGuard is DaoConstants {
    /**
     * @dev Only members of the DAO are allowed to execute the function call.
     */
    modifier onlyMember(DaoRegistry dao) {
        _onlyMember(dao, msg.sender);
        _;
    }

    modifier onlyMember2(DaoRegistry dao, address _addr) {
        _onlyMember(dao, _addr);
        _;
    }

    function _onlyMember(DaoRegistry dao, address _addr) internal view {
        require(isActiveMember(dao, _addr), "onlyMember");
    }

    function isActiveMember(DaoRegistry dao, address _addr)
        public
        view
        returns (bool)
    {
        address bankAddress = dao.extensions(BANK);
        if (bankAddress != address(0x0)) {
            address memberAddr = dao.getAddressIfDelegated(_addr);
            return BankExtension(bankAddress).balanceOf(memberAddr, UNITS) > 0;
        }

        return dao.isMember(_addr);
    }
}

// File: /Users/davidroon/projects/tribute-contracts/contracts/helpers/FairShareHelper.sol



pragma solidity ^0.8.0;

// SPDX-License-Identifier: MIT

/**
MIT License

Copyright (c) 2020 Openlaw

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
 */
library FairShareHelper {
    /**
     * @notice calculates the fair unit amount based the total units and current balance.
     */
    function calc(
        uint256 balance,
        uint256 units,
        uint256 totalUnits
    ) internal pure returns (uint256) {
        require(totalUnits > 0, "totalUnits must be greater than 0");
        require(
            units <= totalUnits,
            "units must be less than or equal to totalUnits"
        );
        if (balance == 0) {
            return 0;
        }
        // The balance for Internal and External tokens are limited to 2^64-1 (see Bank.sol:L411-L421)
        // The maximum number of units is limited to 2^64-1 (see ...)
        // Worst case cenario is: balance=2^64-1 * units=2^64-1, no overflows.
        uint256 prod = balance * units;
        return prod / totalUnits;
    }
}

// File: /Users/davidroon/projects/tribute-contracts/contracts/helpers/GuildKickHelper.sol



pragma solidity ^0.8.0;

// SPDX-License-Identifier: MIT

import "../core/DaoRegistry.sol";
import "../guards/MemberGuard.sol";
import "../adapters/interfaces/IVoting.sol";
import "../helpers/FairShareHelper.sol";
import "../extensions/bank/Bank.sol";

/**
MIT License

Copyright (c) 2020 Openlaw

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
 */

library GuildKickHelper {
    address internal constant TOTAL = address(0xbabe);
    address internal constant UNITS = address(0xFF1CE);
    address internal constant LOOT = address(0xB105F00D);

    bytes32 internal constant BANK = keccak256("bank");
    address internal constant GUILD = address(0xdead);

    /**
     * @notice Transfers the funds from the Guild account to the kicked member account based on the current kick proposal id.
     * @notice The amount of funds is caculated using the actual balance of the member to make sure the member has not ragequited.
     * @dev A kick proposal must be in progress.
     * @dev Only one kick per DAO can be executed at time.
     * @dev Only active members can be kicked out.
     * @dev Only proposals that passed the voting process can be completed.
     * @param dao The dao address.
     */
    function rageKick(DaoRegistry dao, address kickedMember) internal {
        // Get the bank extension
        BankExtension bank = BankExtension(dao.getExtensionAddress(BANK));
        uint256 nbTokens = bank.nbTokens();
        // Calculates the total units, loot and locked loot before any internal transfers
        // it considers the locked loot to be able to calculate the fair amount to ragequit,
        // but locked loot can not be burned.
        uint256 initialTotalUnitsAndLoot =
            bank.balanceOf(TOTAL, UNITS) + bank.balanceOf(TOTAL, LOOT);

        uint256 unitsToBurn = bank.balanceOf(kickedMember, UNITS);
        uint256 lootToBurn = bank.balanceOf(kickedMember, LOOT);
        uint256 unitsAndLootToBurn = unitsToBurn + lootToBurn;

        // Transfers the funds from the internal Guild account to the internal member's account.
        for (uint256 i = 0; i < nbTokens; i++) {
            address token = bank.getToken(i);
            // Calculates the fair amount of funds to ragequit based on the token, units and loot.
            // It takes into account the historical guild balance when the kick proposal was created.
            uint256 amountToRagequit =
                FairShareHelper.calc(
                    bank.balanceOf(GUILD, token),
                    unitsAndLootToBurn,
                    initialTotalUnitsAndLoot
                );

            // Ony execute the internal transfer if the user has enough funds to receive.
            if (amountToRagequit > 0) {
                // gas optimization to allow a higher maximum token limit
                // deliberately not using safemath here to keep overflows from preventing the function execution
                // (which would break ragekicks) if a token overflows,
                // it is because the supply was artificially inflated to oblivion, so we probably don"t care about it anyways
                bank.internalTransfer(
                    GUILD,
                    kickedMember,
                    token,
                    amountToRagequit
                );
            }
        }

        bank.subtractFromBalance(kickedMember, UNITS, unitsToBurn);
        bank.subtractFromBalance(kickedMember, LOOT, lootToBurn);
    }
}

// File: /Users/davidroon/projects/tribute-contracts/contracts/utils/Signatures.sol



pragma solidity ^0.8.0;
pragma experimental ABIEncoderV2;

// SPDX-License-Identifier: MIT

import "../core/DaoRegistry.sol";
import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";

/**
MIT License

Copyright (c) 2020 Openlaw

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
 */

abstract contract Signatures {
    string public constant EIP712_DOMAIN =
        "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract,address actionId)";

    bytes32 public constant EIP712_DOMAIN_TYPEHASH =
        keccak256(abi.encodePacked(EIP712_DOMAIN));

    function hashMessage(
        DaoRegistry dao,
        uint256 chainId,
        address actionId,
        bytes32 message
    ) public pure returns (bytes32) {
        return
            keccak256(
                abi.encodePacked(
                    "\x19\x01",
                    domainSeparator(dao, chainId, actionId),
                    message
                )
            );
    }

    function domainSeparator(
        DaoRegistry dao,
        uint256 chainId,
        address actionId
    ) public pure returns (bytes32) {
        return
            keccak256(
                abi.encode(
                    EIP712_DOMAIN_TYPEHASH,
                    keccak256("Snapshot Message"), // string name
                    keccak256("4"), // string version
                    chainId, // uint256 chainId
                    address(dao), // address verifyingContract,
                    actionId
                )
            );
    }

    function recover(bytes32 hash, bytes memory sig)
        public
        pure
        returns (address)
    {
        return ECDSA.recover(hash, sig);
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

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

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

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

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

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

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

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

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

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

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

// File: @openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC20.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'
        // solhint-disable-next-line max-line-length
        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));
        }
    }

    /**
     * @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
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// File: @openzeppelin/contracts/utils/Address.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @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
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 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");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (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 functionCall(target, data, "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");
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(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) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(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) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // 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

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// File: @openzeppelin/contracts/utils/Context.sol



// SPDX-License-Identifier: MIT

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) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// File: @openzeppelin/contracts/utils/cryptography/ECDSA.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @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 {
    /**
     * @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) {
        // Check the signature length
        if (signature.length != 65) {
            revert("ECDSA: invalid signature length");
        }

        // Divide the signature in r, s and v variables
        bytes32 r;
        bytes32 s;
        uint8 v;

        // ecrecover takes the signature parameters, and the only way to get them
        // currently is to use assembly.
        // solhint-disable-next-line no-inline-assembly
        assembly {
            r := mload(add(signature, 0x20))
            s := mload(add(signature, 0x40))
            v := byte(0, mload(add(signature, 0x60)))
        }

        return recover(hash, v, r, s);
    }

    /**
     * @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) {
        // 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 (281): 0 < s < secp256k1n ÷ 2 + 1, and for v in (282): 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.
        require(uint256(s) <= 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0, "ECDSA: invalid signature 's' value");
        require(v == 27 || v == 28, "ECDSA: invalid signature 'v' value");

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        require(signer != address(0), "ECDSA: invalid signature");

        return signer;
    }

    /**
     * @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 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));
    }
}

// File: @openzeppelin/contracts/utils/cryptography/MerkleProof.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev These functions deal with verification of Merkle trees (hash trees),
 */
library MerkleProof {
    /**
     * @dev Returns true if a `leaf` can be proved to be a part of a Merkle tree
     * defined by `root`. For this, a `proof` must be provided, containing
     * sibling hashes on the branch from the leaf to the root of the tree. Each
     * pair of leaves and each pair of pre-images are assumed to be sorted.
     */
    function verify(bytes32[] memory proof, bytes32 root, bytes32 leaf) internal pure returns (bool) {
        bytes32 computedHash = leaf;

        for (uint256 i = 0; i < proof.length; i++) {
            bytes32 proofElement = proof[i];

            if (computedHash <= proofElement) {
                // Hash(current computed hash + current element of the proof)
                computedHash = keccak256(abi.encodePacked(computedHash, proofElement));
            } else {
                // Hash(current element of the proof + current computed hash)
                computedHash = keccak256(abi.encodePacked(proofElement, computedHash));
            }
        }

        // Check if the computed hash (root) is equal to the provided root
        return computedHash == root;
    }
}