Contract Source Code (Solidity Standard Json-Input format)

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// SPDX-License-Identifier: GPL-3.0-only

pragma solidity ^0.8.10;

import './BalanceHolder_ERC20.sol';

contract RealityETH_ERC20_v3_0 is BalanceHolder_ERC20 {

    address constant NULL_ADDRESS = address(0);

    // History hash when no history is created, or history has been cleared
    bytes32 constant NULL_HASH = bytes32(0);

    // An unitinalized finalize_ts for a question will indicate an unanswered question.
    uint32 constant UNANSWERED = 0;

    // An unanswered reveal_ts for a commitment will indicate that it does not exist.
    uint256 constant COMMITMENT_NON_EXISTENT = 0;

    // Commit->reveal timeout is 1/8 of the question timeout (rounded down).
    uint32 constant COMMITMENT_TIMEOUT_RATIO = 8;

    // Proportion withheld when you claim an earlier bond.
    uint256 constant BOND_CLAIM_FEE_PROPORTION = 40; // One 40th ie 2.5%

    // Special value representing a question that was answered too soon.
    // bytes32(-2). By convention we use bytes32(-1) for "invalid", although the contract does not handle this.
    bytes32 constant UNRESOLVED_ANSWER = 0xfffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe;

    event LogSetQuestionFee(
        address arbitrator,
        uint256 amount
    );

    event LogNewTemplate(
        uint256 indexed template_id,
        address indexed user, 
        string question_text
    );

    event LogNewQuestion(
        bytes32 indexed question_id,
        address indexed user, 
        uint256 template_id,
        string question,
        bytes32 indexed content_hash,
        address arbitrator, 
        uint32 timeout,
        uint32 opening_ts,
        uint256 nonce,
        uint256 created
    );

    event LogMinimumBond(
        bytes32 indexed question_id,
        uint256 min_bond
    );

    event LogFundAnswerBounty(
        bytes32 indexed question_id,
        uint256 bounty_added,
        uint256 bounty,
        address indexed user 
    );

    event LogNewAnswer(
        bytes32 answer,
        bytes32 indexed question_id,
        bytes32 history_hash,
        address indexed user,
        uint256 bond,
        uint256 ts,
        bool is_commitment
    );

    event LogAnswerReveal(
        bytes32 indexed question_id, 
        address indexed user, 
        bytes32 indexed answer_hash, 
        bytes32 answer, 
        uint256 nonce, 
        uint256 bond
    );

    event LogNotifyOfArbitrationRequest(
        bytes32 indexed question_id,
        address indexed user 
    );

    event LogCancelArbitration(
        bytes32 indexed question_id
    );

    event LogFinalize(
        bytes32 indexed question_id,
        bytes32 indexed answer
    );

    event LogClaim(
        bytes32 indexed question_id,
        address indexed user,
        uint256 amount
    );

    event LogReopenQuestion(
        bytes32 indexed question_id,
        bytes32 indexed reopened_question_id
    );

    struct Question {
        bytes32 content_hash;
        address arbitrator;
        uint32 opening_ts;
        uint32 timeout;
        uint32 finalize_ts;
        bool is_pending_arbitration;
        uint256 bounty;
        bytes32 best_answer;
        bytes32 history_hash;
        uint256 bond;
        uint256 min_bond;
    }

    // Stored in a mapping indexed by commitment_id, a hash of commitment hash, question, bond. 
    struct Commitment {
        uint32 reveal_ts;
        bool is_revealed;
        bytes32 revealed_answer;
    }

    // Only used when claiming more bonds than fits into a transaction
    // Stored in a mapping indexed by question_id.
    struct Claim {
        address payee;
        uint256 last_bond;
        uint256 queued_funds;
    }

    uint256 nextTemplateID = 0;
    mapping(uint256 => uint256) public templates;
    mapping(uint256 => bytes32) public template_hashes;
    mapping(bytes32 => Question) public questions;
    mapping(bytes32 => Claim) public question_claims;
    mapping(bytes32 => Commitment) public commitments;
    mapping(address => uint256) public arbitrator_question_fees; 
    mapping(bytes32 => bytes32) public reopened_questions;
    mapping(bytes32 => bool) public reopener_questions;


    modifier onlyArbitrator(bytes32 question_id) {
        require(msg.sender == questions[question_id].arbitrator, "msg.sender must be arbitrator");
        _;
    }

    modifier stateAny() {
        _;
    }

    modifier stateNotCreated(bytes32 question_id) {
        require(questions[question_id].timeout == 0, "question must not exist");
        _;
    }

    modifier stateOpen(bytes32 question_id) {
        require(questions[question_id].timeout > 0, "question must exist");
        require(!questions[question_id].is_pending_arbitration, "question must not be pending arbitration");
        uint32 finalize_ts = questions[question_id].finalize_ts;
        require(finalize_ts == UNANSWERED || finalize_ts > uint32(block.timestamp), "finalization deadline must not have passed");
        uint32 opening_ts = questions[question_id].opening_ts;
        require(opening_ts == 0 || opening_ts <= uint32(block.timestamp), "opening date must have passed"); 
        _;
    }

    modifier statePendingArbitration(bytes32 question_id) {
        require(questions[question_id].is_pending_arbitration, "question must be pending arbitration");
        _;
    }

    modifier stateOpenOrPendingArbitration(bytes32 question_id) {
        require(questions[question_id].timeout > 0, "question must exist");
        uint32 finalize_ts = questions[question_id].finalize_ts;
        require(finalize_ts == UNANSWERED || finalize_ts > uint32(block.timestamp), "finalization dealine must not have passed");
        uint32 opening_ts = questions[question_id].opening_ts;
        require(opening_ts == 0 || opening_ts <= uint32(block.timestamp), "opening date must have passed"); 
        _;
    }

    modifier stateFinalized(bytes32 question_id) {
        require(isFinalized(question_id), "question must be finalized");
        _;
    }

    modifier bondMustDoubleAndMatchMinimum(bytes32 question_id, uint256 tokens) {
        require(tokens > 0, "bond must be positive"); 
        uint256 current_bond = questions[question_id].bond;
        if (current_bond == 0) {
            require(tokens >= (questions[question_id].min_bond), "bond must exceed the minimum");
        } else {
            require(tokens >= (current_bond * 2), "bond must be double at least previous bond");
        }
        _;
    }

    modifier previousBondMustNotBeatMaxPrevious(bytes32 question_id, uint256 max_previous) {
        if (max_previous > 0) {
            require(questions[question_id].bond <= max_previous, "bond must exceed max_previous");
        }
        _;
    }

    /// @notice Constructor, sets up some initial templates
    /// @dev Creates some generalized templates for different question types used in the DApp.
    constructor() {
        createTemplate('{"title": "%s", "type": "bool", "category": "%s", "lang": "%s"}');
        createTemplate('{"title": "%s", "type": "uint", "decimals": 18, "category": "%s", "lang": "%s"}');
        createTemplate('{"title": "%s", "type": "single-select", "outcomes": [%s], "category": "%s", "lang": "%s"}');
        createTemplate('{"title": "%s", "type": "multiple-select", "outcomes": [%s], "category": "%s", "lang": "%s"}');
        createTemplate('{"title": "%s", "type": "datetime", "category": "%s", "lang": "%s"}');
    }

    /// @notice Set the address of the ERC20 token that will be used for bonds.
    /// @dev Should not be used with ERC20-like token contracts that implement callbacks like ERC777 that could cause re-entrancy issues
    /// @param _token The ERC20 token that will be used for bonds.
    function setToken(IERC20 _token) 
    public
    {
        require(token == IERC20(address(0x0)), "Token can only be initialized once");
        token = _token;
    }

    /// @notice Function for arbitrator to set an optional per-question fee. 
    /// @dev The per-question fee, charged when a question is asked, is intended as an anti-spam measure.
    /// @param fee The fee to be charged by the arbitrator when a question is asked
    function setQuestionFee(uint256 fee) 
        stateAny() 
    external {
        arbitrator_question_fees[msg.sender] = fee;
        emit LogSetQuestionFee(msg.sender, fee);
    }

    /// @notice Create a reusable template, which should be a JSON document.
    /// Placeholders should use gettext() syntax, eg %s.
    /// @dev Template data is only stored in the event logs, but its block number is kept in contract storage.
    /// @param content The template content
    /// @return The ID of the newly-created template, which is created sequentially.
    function createTemplate(string memory content) 
        stateAny()
    public returns (uint256) {
        uint256 id = nextTemplateID;
        templates[id] = block.number;
        template_hashes[id] = keccak256(abi.encodePacked(content));
        emit LogNewTemplate(id, msg.sender, content);
        nextTemplateID = id + 1;
        return id;
    }

    /// @notice Create a new reusable template and use it to ask a question
    /// @dev Template data is only stored in the event logs, but its block number is kept in contract storage.
    /// @param content The template content
    /// @param question A string containing the parameters that will be passed into the template to make the question
    /// @param arbitrator The arbitration contract that will have the final word on the answer if there is a dispute
    /// @param timeout How long the contract should wait after the answer is changed before finalizing on that answer
    /// @param opening_ts If set, the earliest time it should be possible to answer the question.
    /// @param nonce A user-specified nonce used in the question ID. Change it to repeat a question.
    /// @return The ID of the newly-created template, which is created sequentially.
    function createTemplateAndAskQuestion(
        string memory content, 
        string memory question, address arbitrator, uint32 timeout, uint32 opening_ts, uint256 nonce 
    ) 
        // stateNotCreated is enforced by the internal _askQuestion
    public returns (bytes32) {
        uint256 template_id = createTemplate(content);
        return askQuestion(template_id, question, arbitrator, timeout, opening_ts, nonce);
    }

    /// @notice Ask a new question without a bounty and return the ID
    /// @dev Template data is only stored in the event logs, but its block number is kept in contract storage.
    /// @dev Calling without the token param will only work if there is no arbitrator-set question fee.
    /// @dev This has the same function signature as askQuestion() in the non-ERC20 version, which is optionally payable.
    /// @param template_id The ID number of the template the question will use
    /// @param question A string containing the parameters that will be passed into the template to make the question
    /// @param arbitrator The arbitration contract that will have the final word on the answer if there is a dispute
    /// @param timeout How long the contract should wait after the answer is changed before finalizing on that answer
    /// @param opening_ts If set, the earliest time it should be possible to answer the question.
    /// @param nonce A user-specified nonce used in the question ID. Change it to repeat a question.
    /// @return The ID of the newly-created question, created deterministically.
    function askQuestion(uint256 template_id, string memory question, address arbitrator, uint32 timeout, uint32 opening_ts, uint256 nonce) 
        // stateNotCreated is enforced by the internal _askQuestion
    public returns (bytes32) {

        require(templates[template_id] > 0, "template must exist");

        bytes32 content_hash = keccak256(abi.encodePacked(template_id, opening_ts, question));
        bytes32 question_id = keccak256(abi.encodePacked(content_hash, arbitrator, timeout, uint256(0), address(this), msg.sender, nonce));

        // We emit this event here because _askQuestion doesn't need to know the unhashed question. Other events are emitted by _askQuestion.
        emit LogNewQuestion(question_id, msg.sender, template_id, question, content_hash, arbitrator, timeout, opening_ts, nonce, block.timestamp);
        _askQuestion(question_id, content_hash, arbitrator, timeout, opening_ts, 0, 0);

        return question_id;
    }

    /// @notice Ask a new question with a bounty and return the ID
    /// @dev Template data is only stored in the event logs, but its block number is kept in contract storage.
    /// @param template_id The ID number of the template the question will use
    /// @param question A string containing the parameters that will be passed into the template to make the question
    /// @param arbitrator The arbitration contract that will have the final word on the answer if there is a dispute
    /// @param timeout How long the contract should wait after the answer is changed before finalizing on that answer
    /// @param opening_ts If set, the earliest time it should be possible to answer the question.
    /// @param nonce A user-specified nonce used in the question ID. Change it to repeat a question.
    /// @param tokens The combined initial question bounty and question fee
    /// @return The ID of the newly-created question, created deterministically.
    function askQuestionERC20(uint256 template_id, string memory question, address arbitrator, uint32 timeout, uint32 opening_ts, uint256 nonce, uint256 tokens) 
        // stateNotCreated is enforced by the internal _askQuestion
    public returns (bytes32) {

        _deductTokensOrRevert(tokens);

        require(templates[template_id] > 0, "template must exist");

        bytes32 content_hash = keccak256(abi.encodePacked(template_id, opening_ts, question));
        bytes32 question_id = keccak256(abi.encodePacked(content_hash, arbitrator, timeout, uint256(0), address(this), msg.sender, nonce));

        // We emit this event here because _askQuestion doesn't need to know the unhashed question. Other events are emitted by _askQuestion.
        emit LogNewQuestion(question_id, msg.sender, template_id, question, content_hash, arbitrator, timeout, opening_ts, nonce, block.timestamp);
        _askQuestion(question_id, content_hash, arbitrator, timeout, opening_ts, 0, tokens);

        return question_id;
    }

    /// @notice Ask a new question and return the ID
    /// @dev Template data is only stored in the event logs, but its block number is kept in contract storage.
    /// @param template_id The ID number of the template the question will use
    /// @param question A string containing the parameters that will be passed into the template to make the question
    /// @param arbitrator The arbitration contract that will have the final word on the answer if there is a dispute
    /// @param timeout How long the contract should wait after the answer is changed before finalizing on that answer
    /// @param opening_ts If set, the earliest time it should be possible to answer the question.
    /// @param nonce A user-specified nonce used in the question ID. Change it to repeat a question.
    /// @param min_bond The minimum bond that may be used for an answer.
    /// @param tokens Number of tokens sent
    /// @return The ID of the newly-created question, created deterministically.
    function askQuestionWithMinBondERC20(uint256 template_id, string memory question, address arbitrator, uint32 timeout, uint32 opening_ts, uint256 nonce, uint256 min_bond, uint256 tokens) 
        // stateNotCreated is enforced by the internal _askQuestion
    public returns (bytes32) {

        _deductTokensOrRevert(tokens);

        require(templates[template_id] > 0, "template must exist");

        bytes32 content_hash = keccak256(abi.encodePacked(template_id, opening_ts, question));
        bytes32 question_id = keccak256(abi.encodePacked(content_hash, arbitrator, timeout, min_bond, address(this), msg.sender, nonce));

        // We emit this event here because _askQuestion doesn't need to know the unhashed question.
        // Other events are emitted by _askQuestion.
        emit LogNewQuestion(question_id, msg.sender, template_id, question, content_hash, arbitrator, timeout, opening_ts, nonce, block.timestamp);
        _askQuestion(question_id, content_hash, arbitrator, timeout, opening_ts, min_bond, tokens);

        return question_id;
    }

    function _deductTokensOrRevert(uint256 tokens) 
    internal {
 
        if (tokens == 0) {
            return;
        }

        uint256 bal = balanceOf[msg.sender];

        // Deduct any tokens you have in your internal balance first
        if (bal > 0) {
            if (bal >= tokens) {
                balanceOf[msg.sender] = bal - tokens;
                return;
            } else {
                tokens = tokens - bal;
                balanceOf[msg.sender] = 0;
            }
        }
        // Now we need to charge the rest from 
        require(token.transferFrom(msg.sender, address(this), tokens), "Transfer of tokens failed, insufficient approved balance?");
        return;

    }

    function _askQuestion(bytes32 question_id, bytes32 content_hash, address arbitrator, uint32 timeout, uint32 opening_ts, uint256 min_bond, uint256 tokens) 
        stateNotCreated(question_id)
    internal {

        // A timeout of 0 makes no sense, and we will use this to check existence
        require(timeout > 0, "timeout must be positive"); 
        require(timeout < 365 days, "timeout must be less than 365 days"); 

        uint256 bounty = tokens;

        // The arbitrator can set a fee for asking a question. 
        // This is intended as an anti-spam defence.
        // The fee is waived if the arbitrator is asking the question.
        // This allows them to set an impossibly high fee and make users proxy the question through them.
        // This would allow more sophisticated pricing, question whitelisting etc.
        if (arbitrator != NULL_ADDRESS && msg.sender != arbitrator) {
            uint256 question_fee = arbitrator_question_fees[arbitrator];
            require(bounty >= question_fee, "Tokens provided must cover question fee"); 
            bounty = bounty - question_fee;
            balanceOf[arbitrator] = balanceOf[arbitrator] + question_fee;
        }

        questions[question_id].content_hash = content_hash;
        questions[question_id].arbitrator = arbitrator;
        questions[question_id].opening_ts = opening_ts;
        questions[question_id].timeout = timeout;

        if (bounty > 0) {
            questions[question_id].bounty = bounty;
            emit LogFundAnswerBounty(question_id, bounty, bounty, msg.sender);
        }

        if (min_bond > 0) {
            questions[question_id].min_bond = min_bond;
            emit LogMinimumBond(question_id, min_bond);
        }

    }

    /// @notice Add funds to the bounty for a question
    /// @dev Add bounty funds after the initial question creation. Can be done any time until the question is finalized.
    /// @param question_id The ID of the question you wish to fund
    /// @param tokens The number of tokens to fund
    function fundAnswerBountyERC20(bytes32 question_id, uint256 tokens) 
        stateOpen(question_id)
    external {
        _deductTokensOrRevert(tokens);
        questions[question_id].bounty = questions[question_id].bounty + tokens;
        emit LogFundAnswerBounty(question_id, tokens, questions[question_id].bounty, msg.sender);
    }

    /// @notice Submit an answer for a question.
    /// @dev Adds the answer to the history and updates the current "best" answer.
    /// May be subject to front-running attacks; Substitute submitAnswerCommitment()->submitAnswerReveal() to prevent them.
    /// @param question_id The ID of the question
    /// @param answer The answer, encoded into bytes32
    /// @param max_previous If specified, reverts if a bond higher than this was submitted after you sent your transaction.
    /// @param tokens The amount of tokens to submit
    function submitAnswerERC20(bytes32 question_id, bytes32 answer, uint256 max_previous, uint256 tokens) 
        stateOpen(question_id)
        bondMustDoubleAndMatchMinimum(question_id, tokens)
        previousBondMustNotBeatMaxPrevious(question_id, max_previous)
    external {
        _deductTokensOrRevert(tokens);
        _addAnswerToHistory(question_id, answer, msg.sender, tokens, false);
        _updateCurrentAnswer(question_id, answer);
    }

    /// @notice Submit an answer for a question, crediting it to the specified account.
    /// @dev Adds the answer to the history and updates the current "best" answer.
    /// May be subject to front-running attacks; Substitute submitAnswerCommitment()->submitAnswerReveal() to prevent them.
    /// @param question_id The ID of the question
    /// @param answer The answer, encoded into bytes32
    /// @param max_previous If specified, reverts if a bond higher than this was submitted after you sent your transaction.
    /// @param answerer The account to which the answer should be credited
    /// @param tokens Number of tokens sent
    function submitAnswerForERC20(bytes32 question_id, bytes32 answer, uint256 max_previous, address answerer, uint256 tokens)
        stateOpen(question_id)
        bondMustDoubleAndMatchMinimum(question_id, tokens)
        previousBondMustNotBeatMaxPrevious(question_id, max_previous)
    external {
        _deductTokensOrRevert(tokens);
        require(answerer != NULL_ADDRESS, "answerer must be non-zero");
        _addAnswerToHistory(question_id, answer, answerer, tokens, false);
        _updateCurrentAnswer(question_id, answer);
    }

    // @notice Verify and store a commitment, including an appropriate timeout
    // @param question_id The ID of the question to store
    // @param commitment The ID of the commitment
    function _storeCommitment(bytes32 question_id, bytes32 commitment_id) 
    internal
    {
        require(commitments[commitment_id].reveal_ts == COMMITMENT_NON_EXISTENT, "commitment must not already exist");

        uint32 commitment_timeout = questions[question_id].timeout / COMMITMENT_TIMEOUT_RATIO;
        commitments[commitment_id].reveal_ts = uint32(block.timestamp) + commitment_timeout;
    }

    /// @notice Submit the hash of an answer, laying your claim to that answer if you reveal it in a subsequent transaction.
    /// @dev Creates a hash, commitment_id, uniquely identifying this answer, to this question, with this bond.
    /// The commitment_id is stored in the answer history where the answer would normally go.
    /// Does not update the current best answer - this is left to the later submitAnswerReveal() transaction.
    /// @param question_id The ID of the question
    /// @param answer_hash The hash of your answer, plus a nonce that you will later reveal
    /// @param max_previous If specified, reverts if a bond higher than this was submitted after you sent your transaction.
    /// @param _answerer If specified, the address to be given as the question answerer. Defaults to the sender.
    /// @param tokens Number of tokens sent
    /// @dev Specifying the answerer is useful if you want to delegate the commit-and-reveal to a third-party.
    function submitAnswerCommitmentERC20(bytes32 question_id, bytes32 answer_hash, uint256 max_previous, address _answerer, uint256 tokens) 
        stateOpen(question_id)
        bondMustDoubleAndMatchMinimum(question_id, tokens)
        previousBondMustNotBeatMaxPrevious(question_id, max_previous)
    external {

        _deductTokensOrRevert(tokens);

        bytes32 commitment_id = keccak256(abi.encodePacked(question_id, answer_hash, tokens));
        address answerer = (_answerer == NULL_ADDRESS) ? msg.sender : _answerer;

        _storeCommitment(question_id, commitment_id);
        _addAnswerToHistory(question_id, commitment_id, answerer, tokens, true);

    }

    /// @notice Submit the answer whose hash you sent in a previous submitAnswerCommitment() transaction
    /// @dev Checks the parameters supplied recreate an existing commitment, and stores the revealed answer
    /// Updates the current answer unless someone has since supplied a new answer with a higher bond
    /// msg.sender is intentionally not restricted to the user who originally sent the commitment; 
    /// For example, the user may want to provide the answer+nonce to a third-party service and let them send the tx
    /// NB If we are pending arbitration, it will be up to the arbitrator to wait and see any outstanding reveal is sent
    /// @param question_id The ID of the question
    /// @param answer The answer, encoded as bytes32
    /// @param nonce The nonce that, combined with the answer, recreates the answer_hash you gave in submitAnswerCommitment()
    /// @param bond The bond that you paid in your submitAnswerCommitment() transaction
    function submitAnswerReveal(bytes32 question_id, bytes32 answer, uint256 nonce, uint256 bond) 
        stateOpenOrPendingArbitration(question_id)
    external {

        bytes32 answer_hash = keccak256(abi.encodePacked(answer, nonce));
        bytes32 commitment_id = keccak256(abi.encodePacked(question_id, answer_hash, bond));

        require(!commitments[commitment_id].is_revealed, "commitment must not have been revealed yet");
        require(commitments[commitment_id].reveal_ts > uint32(block.timestamp), "reveal deadline must not have passed");

        commitments[commitment_id].revealed_answer = answer;
        commitments[commitment_id].is_revealed = true;

        if (bond == questions[question_id].bond) {
            _updateCurrentAnswer(question_id, answer);
        }

        emit LogAnswerReveal(question_id, msg.sender, answer_hash, answer, nonce, bond);

    }

    function _addAnswerToHistory(bytes32 question_id, bytes32 answer_or_commitment_id, address answerer, uint256 bond, bool is_commitment) 
    internal 
    {
        bytes32 new_history_hash = keccak256(abi.encodePacked(questions[question_id].history_hash, answer_or_commitment_id, bond, answerer, is_commitment));

        // Update the current bond level, if there's a bond (ie anything except arbitration)
        if (bond > 0) {
            questions[question_id].bond = bond;
        }
        questions[question_id].history_hash = new_history_hash;

        emit LogNewAnswer(answer_or_commitment_id, question_id, new_history_hash, answerer, bond, block.timestamp, is_commitment);
    }

    function _updateCurrentAnswer(bytes32 question_id, bytes32 answer)
    internal {
        questions[question_id].best_answer = answer;
        questions[question_id].finalize_ts = uint32(block.timestamp) + questions[question_id].timeout;
    }

    // Like _updateCurrentAnswer but without advancing the timeout
    function _updateCurrentAnswerByArbitrator(bytes32 question_id, bytes32 answer)
    internal {
        questions[question_id].best_answer = answer;
        questions[question_id].finalize_ts = uint32(block.timestamp);
    }

    /// @notice Notify the contract that the arbitrator has been paid for a question, freezing it pending their decision.
    /// @dev The arbitrator contract is trusted to only call this if they've been paid, and tell us who paid them.
    /// @param question_id The ID of the question
    /// @param requester The account that requested arbitration
    /// @param max_previous If specified, reverts if a bond higher than this was submitted after you sent your transaction.
    function notifyOfArbitrationRequest(bytes32 question_id, address requester, uint256 max_previous) 
        onlyArbitrator(question_id)
        stateOpen(question_id)
        previousBondMustNotBeatMaxPrevious(question_id, max_previous)
    external {
        require(questions[question_id].finalize_ts > UNANSWERED, "Question must already have an answer when arbitration is requested");
        questions[question_id].is_pending_arbitration = true;
        emit LogNotifyOfArbitrationRequest(question_id, requester);
    }

    /// @notice Cancel a previously-requested arbitration and extend the timeout
    /// @dev Useful when doing arbitration across chains that can't be requested atomically
    /// @param question_id The ID of the question
    function cancelArbitration(bytes32 question_id) 
        onlyArbitrator(question_id)
        statePendingArbitration(question_id)
    external {
        questions[question_id].is_pending_arbitration = false;
        questions[question_id].finalize_ts = uint32(block.timestamp) + questions[question_id].timeout;
        emit LogCancelArbitration(question_id);
    }

    /// @notice Submit the answer for a question, for use by the arbitrator.
    /// @dev Doesn't require (or allow) a bond.
    /// If the current final answer is correct, the account should be whoever submitted it.
    /// If the current final answer is wrong, the account should be whoever paid for arbitration.
    /// However, the answerer stipulations are not enforced by the contract.
    /// @param question_id The ID of the question
    /// @param answer The answer, encoded into bytes32
    /// @param answerer The account credited with this answer for the purpose of bond claims
    function submitAnswerByArbitrator(bytes32 question_id, bytes32 answer, address answerer) 
        onlyArbitrator(question_id)
        statePendingArbitration(question_id)
    public {

        require(answerer != NULL_ADDRESS, "answerer must be provided");
        emit LogFinalize(question_id, answer);

        questions[question_id].is_pending_arbitration = false;
        _addAnswerToHistory(question_id, answer, answerer, 0, false);
        _updateCurrentAnswerByArbitrator(question_id, answer);
    }

    /// @notice Submit the answer for a question, for use by the arbitrator, working out the appropriate winner based on the last answer details.
    /// @dev Doesn't require (or allow) a bond.
    /// @param question_id The ID of the question
    /// @param answer The answer, encoded into bytes32
    /// @param payee_if_wrong The account to by credited as winner if the last answer given is wrong, usually the account that paid the arbitrator
    /// @param last_history_hash The history hash before the final one
    /// @param last_answer_or_commitment_id The last answer given, or the commitment ID if it was a commitment.
    /// @param last_answerer The address that supplied the last answer
    function assignWinnerAndSubmitAnswerByArbitrator(bytes32 question_id, bytes32 answer, address payee_if_wrong, bytes32 last_history_hash, bytes32 last_answer_or_commitment_id, address last_answerer) 
    external {
        bool is_commitment = _verifyHistoryInputOrRevert(questions[question_id].history_hash, last_history_hash, last_answer_or_commitment_id, questions[question_id].bond, last_answerer);

        address payee;
        // If the last answer is an unrevealed commit, it's always wrong.
        // For anything else, the last answer was set as the "best answer" in submitAnswer or submitAnswerReveal.
        if (is_commitment && !commitments[last_answer_or_commitment_id].is_revealed) {
            require(commitments[last_answer_or_commitment_id].reveal_ts < uint32(block.timestamp), "You must wait for the reveal deadline before finalizing");
            payee = payee_if_wrong;
        } else {
            payee = (questions[question_id].best_answer == answer) ? last_answerer : payee_if_wrong;
        }
        submitAnswerByArbitrator(question_id, answer, payee);
    }


    /// @notice Report whether the answer to the specified question is finalized
    /// @param question_id The ID of the question
    /// @return Return true if finalized
    function isFinalized(bytes32 question_id) 
    view public returns (bool) {
        uint32 finalize_ts = questions[question_id].finalize_ts;
        return ( !questions[question_id].is_pending_arbitration && (finalize_ts > UNANSWERED) && (finalize_ts <= uint32(block.timestamp)) );
    }

    /// @notice (Deprecated) Return the final answer to the specified question, or revert if there isn't one
    /// @param question_id The ID of the question
    /// @return The answer formatted as a bytes32
    function getFinalAnswer(bytes32 question_id) 
        stateFinalized(question_id)
    external view returns (bytes32) {
        return questions[question_id].best_answer;
    }

    /// @notice Return the final answer to the specified question, or revert if there isn't one
    /// @param question_id The ID of the question
    /// @return The answer formatted as a bytes32
    function resultFor(bytes32 question_id) 
        stateFinalized(question_id)
    public view returns (bytes32) {
        return questions[question_id].best_answer;
    }

    /// @notice Returns whether the question was answered before it had an answer, ie resolved to UNRESOLVED_ANSWER
    /// @param question_id The ID of the question 
    function isSettledTooSoon(bytes32 question_id)
    public view returns(bool) {
        return (resultFor(question_id) == UNRESOLVED_ANSWER);
    }

    /// @notice Like resultFor(), but errors out if settled too soon, or returns the result of a replacement if it was reopened at the right time and settled
    /// @param question_id The ID of the question 
    function resultForOnceSettled(bytes32 question_id)
    external view returns(bytes32) {
        bytes32 result = resultFor(question_id);
        if (result == UNRESOLVED_ANSWER) {
            // Try the replacement
            bytes32 replacement_id = reopened_questions[question_id];
            require(replacement_id != bytes32(0x0), "Question was settled too soon and has not been reopened");
            // We only try one layer down rather than recursing to keep the gas costs predictable
            result = resultFor(replacement_id);
            require(result != UNRESOLVED_ANSWER, "Question replacement was settled too soon and has not been reopened");
        }
        return result;
    }

    /// @notice Asks a new question reopening a previously-asked question that was settled too soon
    /// @dev A special version of askQuestion() that replaces a previous question that was settled too soon
    /// @param template_id The ID number of the template the question will use
    /// @param question A string containing the parameters that will be passed into the template to make the question
    /// @param arbitrator The arbitration contract that will have the final word on the answer if there is a dispute
    /// @param timeout How long the contract should wait after the answer is changed before finalizing on that answer
    /// @param opening_ts If set, the earliest time it should be possible to answer the question.
    /// @param nonce A user-specified nonce used in the question ID. Change it to repeat a question.
    /// @param min_bond The minimum bond that can be used to provide the first answer.
    /// @param reopens_question_id The ID of the question this reopens
    /// @param tokens The number of tokens you want to use as an additional question reward for the reopened question.
    /// @return The ID of the newly-created question, created deterministically.
    function reopenQuestionERC20(uint256 template_id, string memory question, address arbitrator, uint32 timeout, uint32 opening_ts, uint256 nonce, uint256 min_bond, bytes32 reopens_question_id, uint256 tokens)
        // stateNotCreated is enforced by the internal _askQuestion
    public returns (bytes32) {

        // _deductTokensOrRevert will be called when we call askQuestionWithMinBondERC20

        require(isSettledTooSoon(reopens_question_id), "You can only reopen questions that resolved as settled too soon");

        bytes32 content_hash = keccak256(abi.encodePacked(template_id, opening_ts, question));

        // A reopening must exactly match the original question, except for the nonce and the creator
        require(content_hash == questions[reopens_question_id].content_hash, "content hash mismatch");
        require(arbitrator == questions[reopens_question_id].arbitrator, "arbitrator mismatch");
        require(timeout == questions[reopens_question_id].timeout, "timeout mismatch");
        require(opening_ts == questions[reopens_question_id].opening_ts , "opening_ts mismatch");
        require(min_bond == questions[reopens_question_id].min_bond, "min_bond mismatch");

        // If the the question was itself reopening some previous question, you'll have to re-reopen the previous question first.
        // This ensures the bounty can be passed on to the next attempt of the original question.
        require(!reopener_questions[reopens_question_id], "Question is already reopening a previous question");

        // A question can only be reopened once, unless the reopening was also settled too soon in which case it can be replaced
        bytes32 existing_reopen_question_id = reopened_questions[reopens_question_id];

        // Normally when we reopen a question we will take its bounty and pass it on to the reopened version.
        bytes32 take_bounty_from_question_id = reopens_question_id;
        // If the question has already been reopened but was again settled too soon, we can transfer its bounty to the next attempt.
        if (existing_reopen_question_id != bytes32(0)) {
            require(isSettledTooSoon(existing_reopen_question_id), "Question has already been reopened");
            // We'll overwrite the reopening with our new question and move the bounty.
            // Once that's done we'll detach the failed reopener and you'll be able to reopen that too if you really want, but without the bounty.
            reopener_questions[existing_reopen_question_id] = false;
            take_bounty_from_question_id = existing_reopen_question_id;
        }

        bytes32 question_id = askQuestionWithMinBondERC20(template_id, question, arbitrator, timeout, opening_ts, nonce, min_bond, tokens);

        reopened_questions[reopens_question_id] = question_id;
        reopener_questions[question_id] = true;

        questions[question_id].bounty = questions[take_bounty_from_question_id].bounty + questions[question_id].bounty;
        questions[take_bounty_from_question_id].bounty = 0;

        emit LogReopenQuestion(question_id, reopens_question_id);

        return question_id;
    }

    /// @notice Return the final answer to the specified question, provided it matches the specified criteria.
    /// @dev Reverts if the question is not finalized, or if it does not match the specified criteria.
    /// @param question_id The ID of the question
    /// @param content_hash The hash of the question content (template ID + opening time + question parameter string)
    /// @param arbitrator The arbitrator chosen for the question (regardless of whether they are asked to arbitrate)
    /// @param min_timeout The timeout set in the initial question settings must be this high or higher
    /// @param min_bond The bond sent with the final answer must be this high or higher
    /// @return The answer formatted as a bytes32
    function getFinalAnswerIfMatches(
        bytes32 question_id, 
        bytes32 content_hash, address arbitrator, uint32 min_timeout, uint256 min_bond
    ) 
        stateFinalized(question_id)
    external view returns (bytes32) {
        require(content_hash == questions[question_id].content_hash, "content hash must match");
        require(arbitrator == questions[question_id].arbitrator, "arbitrator must match");
        require(min_timeout <= questions[question_id].timeout, "timeout must be long enough");
        require(min_bond <= questions[question_id].bond, "bond must be high enough");
        return questions[question_id].best_answer;
    }

    /// @notice Assigns the winnings (bounty and bonds) to everyone who gave the accepted answer
    /// Caller must provide the answer history, in reverse order
    /// @dev Works up the chain and assign bonds to the person who gave the right answer
    /// If someone gave the winning answer earlier, they must get paid from the higher bond
    /// That means we can't pay out the bond added at n until we have looked at n-1
    /// The first answer is authenticated by checking against the stored history_hash.
    /// One of the inputs to history_hash is the history_hash before it, so we use that to authenticate the next entry, etc
    /// Once we get to a null hash we'll know we're done and there are no more answers.
    /// Usually you would call the whole thing in a single transaction, but if not then the data is persisted to pick up later.
    /// @param question_id The ID of the question
    /// @param history_hashes Second-last-to-first, the hash of each history entry. (Final one should be empty).
    /// @param addrs Last-to-first, the address of each answerer or commitment sender
    /// @param bonds Last-to-first, the bond supplied with each answer or commitment
    /// @param answers Last-to-first, each answer supplied, or commitment ID if the answer was supplied with commit->reveal
    function claimWinnings(
        bytes32 question_id, 
        bytes32[] memory history_hashes, address[] memory addrs, uint256[] memory bonds, bytes32[] memory answers
    ) 
        stateFinalized(question_id)
    public {

        require(history_hashes.length > 0, "at least one history hash entry must be provided");

        // These are only set if we split our claim over multiple transactions.
        address payee = question_claims[question_id].payee; 
        uint256 last_bond = question_claims[question_id].last_bond; 
        uint256 queued_funds = question_claims[question_id].queued_funds; 

        // Starts as the hash of the final answer submitted. It'll be cleared when we're done.
        // If we're splitting the claim over multiple transactions, it'll be the hash where we left off last time
        bytes32 last_history_hash = questions[question_id].history_hash;

        bytes32 best_answer = questions[question_id].best_answer;

        uint256 i;
        for (i = 0; i < history_hashes.length; i++) {
        
            // Check input against the history hash, and see which of 2 possible values of is_commitment fits.
            bool is_commitment = _verifyHistoryInputOrRevert(last_history_hash, history_hashes[i], answers[i], bonds[i], addrs[i]);
            
            queued_funds = queued_funds + last_bond; 
            (queued_funds, payee) = _processHistoryItem(
                question_id, best_answer, queued_funds, payee, 
                addrs[i], bonds[i], answers[i], is_commitment);
 
            // Line the bond up for next time, when it will be added to somebody's queued_funds
            last_bond = bonds[i];

            // Burn (just leave in contract balance) a fraction of all bonds except the final one.
            // This creates a cost to increasing your own bond, which could be used to delay resolution maliciously
            if (last_bond != questions[question_id].bond) {
                last_bond = last_bond - last_bond / BOND_CLAIM_FEE_PROPORTION;
            }

            last_history_hash = history_hashes[i];

        }
 
        if (last_history_hash != NULL_HASH) {
            // We haven't yet got to the null hash (1st answer), ie the caller didn't supply the full answer chain.
            // Persist the details so we can pick up later where we left off later.

            // If we know who to pay we can go ahead and pay them out, only keeping back last_bond
            // (We always know who to pay unless all we saw were unrevealed commits)
            if (payee != NULL_ADDRESS) {
                _payPayee(question_id, payee, queued_funds);
                queued_funds = 0;
            }

            question_claims[question_id].payee = payee;
            question_claims[question_id].last_bond = last_bond;
            question_claims[question_id].queued_funds = queued_funds;
        } else {
            // There is nothing left below us so the payee can keep what remains
            _payPayee(question_id, payee, queued_funds + last_bond);
            delete question_claims[question_id];
        }

        questions[question_id].history_hash = last_history_hash;

    }

    function _payPayee(bytes32 question_id, address payee, uint256 value) 
    internal {
        balanceOf[payee] = balanceOf[payee] + value;
        emit LogClaim(question_id, payee, value);
    }

    function _verifyHistoryInputOrRevert(
        bytes32 last_history_hash,
        bytes32 history_hash, bytes32 answer, uint256 bond, address addr
    )
    internal pure returns (bool) {
        if (last_history_hash == keccak256(abi.encodePacked(history_hash, answer, bond, addr, true)) ) {
            return true;
        }
        if (last_history_hash == keccak256(abi.encodePacked(history_hash, answer, bond, addr, false)) ) {
            return false;
        } 
        revert("History input provided did not match the expected hash");
    }

    function _processHistoryItem(
        bytes32 question_id, bytes32 best_answer, 
        uint256 queued_funds, address payee, 
        address addr, uint256 bond, bytes32 answer, bool is_commitment
    )
    internal returns (uint256, address) {

        // For commit-and-reveal, the answer history holds the commitment ID instead of the answer.
        // We look at the referenced commitment ID and switch in the actual answer.
        if (is_commitment) {
            bytes32 commitment_id = answer;
            // If it's a commit but it hasn't been revealed, it will always be considered wrong.
            if (!commitments[commitment_id].is_revealed) {
                delete commitments[commitment_id];
                return (queued_funds, payee);
            } else {
                answer = commitments[commitment_id].revealed_answer;
                delete commitments[commitment_id];
            }
        }

        if (answer == best_answer) {

            if (payee == NULL_ADDRESS) {

                // The entry is for the first payee we come to, ie the winner.
                // They get the question bounty.
                payee = addr;

                if (best_answer != UNRESOLVED_ANSWER && questions[question_id].bounty > 0) {
                    _payPayee(question_id, payee, questions[question_id].bounty);
                    questions[question_id].bounty = 0;
                }

            } else if (addr != payee) {

                // Answerer has changed, ie we found someone lower down who needs to be paid

                // The lower answerer will take over receiving bonds from higher answerer.
                // They should also be paid the takeover fee, which is set at a rate equivalent to their bond. 
                // (This is our arbitrary rule, to give consistent right-answerers a defence against high-rollers.)

                // There should be enough for the fee, but if not, take what we have.
                // There's an edge case involving weird arbitrator behaviour where we may be short.
                uint256 answer_takeover_fee = (queued_funds >= bond) ? bond : queued_funds;
                // Settle up with the old (higher-bonded) payee
                _payPayee(question_id, payee, queued_funds - answer_takeover_fee);

                // Now start queued_funds again for the new (lower-bonded) payee
                payee = addr;
                queued_funds = answer_takeover_fee;

            }

        }

        return (queued_funds, payee);

    }

    /// @notice Convenience function to assign bounties/bonds for multiple questions in one go, then withdraw all your funds.
    /// Caller must provide the answer history for each question, in reverse order
    /// @dev Can be called by anyone to assign bonds/bounties, but funds are only withdrawn for the user making the call.
    /// @param question_ids The IDs of the questions you want to claim for
    /// @param lengths The number of history entries you will supply for each question ID
    /// @param hist_hashes In a single list for all supplied questions, the hash of each history entry.
    /// @param addrs In a single list for all supplied questions, the address of each answerer or commitment sender
    /// @param bonds In a single list for all supplied questions, the bond supplied with each answer or commitment
    /// @param answers In a single list for all supplied questions, each answer supplied, or commitment ID 
    function claimMultipleAndWithdrawBalance(
        bytes32[] memory question_ids, uint256[] memory lengths, 
        bytes32[] memory hist_hashes, address[] memory addrs, uint256[] memory bonds, bytes32[] memory answers
    ) 
        stateAny() // The finalization checks are done in the claimWinnings function
    public {
        
        uint256 qi;
        uint256 i;
        for (qi = 0; qi < question_ids.length; qi++) {
            bytes32 qid = question_ids[qi];
            uint256 ln = lengths[qi];
            bytes32[] memory hh = new bytes32[](ln);
            address[] memory ad = new address[](ln);
            uint256[] memory bo = new uint256[](ln);
            bytes32[] memory an = new bytes32[](ln);
            uint256 j;
            for (j = 0; j < ln; j++) {
                hh[j] = hist_hashes[i];
                ad[j] = addrs[i];
                bo[j] = bonds[i];
                an[j] = answers[i];
                i++;
            }
            claimWinnings(qid, hh, ad, bo, an);
        }
        withdraw();
    }

    /// @notice Returns the questions's content hash, identifying the question content
    /// @param question_id The ID of the question 
    function getContentHash(bytes32 question_id) 
    public view returns(bytes32) {
        return questions[question_id].content_hash;
    }

    /// @notice Returns the arbitrator address for the question
    /// @param question_id The ID of the question 
    function getArbitrator(bytes32 question_id) 
    public view returns(address) {
        return questions[question_id].arbitrator;
    }

    /// @notice Returns the timestamp when the question can first be answered
    /// @param question_id The ID of the question 
    function getOpeningTS(bytes32 question_id) 
    public view returns(uint32) {
        return questions[question_id].opening_ts;
    }

    /// @notice Returns the timeout in seconds used after each answer
    /// @param question_id The ID of the question 
    function getTimeout(bytes32 question_id) 
    public view returns(uint32) {
        return questions[question_id].timeout;
    }

    /// @notice Returns the timestamp at which the question will be/was finalized
    /// @param question_id The ID of the question 
    function getFinalizeTS(bytes32 question_id) 
    public view returns(uint32) {
        return questions[question_id].finalize_ts;
    }

    /// @notice Returns whether the question is pending arbitration
    /// @param question_id The ID of the question 
    function isPendingArbitration(bytes32 question_id) 
    public view returns(bool) {
        return questions[question_id].is_pending_arbitration;
    }

    /// @notice Returns the current total unclaimed bounty
    /// @dev Set back to zero once the bounty has been claimed
    /// @param question_id The ID of the question 
    function getBounty(bytes32 question_id) 
    public view returns(uint256) {
        return questions[question_id].bounty;
    }

    /// @notice Returns the current best answer
    /// @param question_id The ID of the question 
    function getBestAnswer(bytes32 question_id) 
    public view returns(bytes32) {
        return questions[question_id].best_answer;
    }

    /// @notice Returns the history hash of the question 
    /// @param question_id The ID of the question 
    /// @dev Updated on each answer, then rewound as each is claimed
    function getHistoryHash(bytes32 question_id) 
    public view returns(bytes32) {
        return questions[question_id].history_hash;
    }

    /// @notice Returns the highest bond posted so far for a question
    /// @param question_id The ID of the question 
    function getBond(bytes32 question_id) 
    public view returns(uint256) {
        return questions[question_id].bond;
    }

    /// @notice Returns the minimum bond that can answer the question
    /// @param question_id The ID of the question
    function getMinBond(bytes32 question_id)
    public view returns(uint256) {
        return questions[question_id].min_bond;
    }

}

// SPDX-License-Identifier: GPL-3.0-only

pragma solidity ^0.8.10;


/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
interface IERC20 {
    function totalSupply() external view returns (uint256);

    function balanceOf(address who) external view returns (uint256);

    function allowance(address owner, address spender) external view returns (uint256);

    function transfer(address to, uint256 value) external returns (bool);

    function approve(address spender, uint256 value) external returns (bool);

    function transferFrom(address from, address to, uint256 value) external returns (bool);

    function decimals() external returns (uint8); 

    function name() external returns (string memory); 

    function symbol() external returns (string memory); 

    event Transfer(address indexed from, address indexed to, uint256 value);

    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// SPDX-License-Identifier: GPL-3.0-only

pragma solidity ^0.8.10;

import './IERC20.sol';

interface IBalanceHolder_ERC20 {
  function withdraw (  ) external;
  function balanceOf ( address ) external view returns ( uint256 );
  function token ( ) external view returns ( IERC20 );
}

// SPDX-License-Identifier: GPL-3.0-only

pragma solidity ^0.8.10;

import './IERC20.sol';
import './IBalanceHolder_ERC20.sol';

contract BalanceHolder_ERC20 is IBalanceHolder_ERC20 {

    IERC20 public token;

    mapping(address => uint256) public balanceOf;

    event LogWithdraw(
        address indexed user,
        uint256 amount
    );

    function withdraw() 
    public {
        uint256 bal = balanceOf[msg.sender];
        balanceOf[msg.sender] = 0;
        require(token.transfer(msg.sender, bal));
        emit LogWithdraw(msg.sender, bal);
    }

}

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

• No Contract Security Audit Submitted- Submit Audit Here

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