224 lines
8.0 KiB
Solidity
224 lines
8.0 KiB
Solidity
// SPDX-License-Identifier: Unlicense
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pragma solidity ^0.8.24;
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import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
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import "./IAcceptAvailability.sol";
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import "./IOnValidate.sol";
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import "hardhat/console.sol";
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struct Post {
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uint id;
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address sender;
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address author;
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string contentId;
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}
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struct Stake {
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uint id;
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bool inFavor;
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uint256 amount;
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address sender;
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}
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struct ValidationPool {
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uint id;
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uint postIndex;
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address sender;
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mapping(uint => Stake) stakes;
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uint stakeCount;
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uint256 fee;
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uint duration;
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uint endTime;
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bool resolved;
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bool outcome;
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bool callbackOnValidate;
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bytes callbackData;
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}
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/// This contract must manage validation pools and reputation,
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/// because otherwise there's no way to enforce appropriate permissions on
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/// transfer of value between reputation NFTs.
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contract DAO is ERC20("Reputation", "REP") {
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mapping(uint => address) public members;
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uint public memberCount;
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mapping(address => bool) public isMember;
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mapping(uint => ValidationPool) public validationPools;
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uint public validationPoolCount;
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mapping(uint => Post) public posts;
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uint public postCount;
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// ufixed8x1 constant mintingRatio = 1;
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// ufixed8x1 constant quorum = 0;
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// ufixed8x1 constant stakeForAuthor = 0.5;
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// ufixed8x1 constant winningRatio = 0.5;
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// TODO: Make parameters adjustable
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// TODO: Add forum parameters
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uint public constant minDuration = 60; // 1 minute
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uint public constant maxDuration = 86400; // 1 day
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event PostAdded(uint postIndex);
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event ValidationPoolInitiated(uint poolIndex);
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event ValidationPoolResolved(uint poolIndex, bool votePasses);
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function addPost(
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address author,
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string calldata contentId
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) external returns (uint postIndex) {
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postIndex = postCount++;
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Post storage post = posts[postIndex];
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post.author = author;
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post.sender = msg.sender;
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post.id = postIndex;
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post.contentId = contentId;
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emit PostAdded(postIndex);
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}
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/// Accept fee to initiate a validation pool
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/// TODO: Handle multiple authors
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/// TODO: Constrain duration to allowable range
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function initiateValidationPool(
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uint postIndex,
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uint duration,
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bool callbackOnValidate,
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bytes calldata callbackData
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) external payable returns (uint poolIndex) {
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require(msg.value > 0, "Fee is required to initiate validation pool");
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require(duration >= minDuration, "Duration is too short");
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require(duration <= maxDuration, "Duration is too long");
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Post storage post = posts[postIndex];
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require(post.author != address(0), "Target post not found");
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poolIndex = validationPoolCount++;
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ValidationPool storage pool = validationPools[poolIndex];
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pool.sender = msg.sender;
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pool.postIndex = postIndex;
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pool.fee = msg.value;
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pool.duration = duration;
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pool.endTime = block.timestamp + duration;
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pool.id = poolIndex;
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pool.callbackOnValidate = callbackOnValidate;
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pool.callbackData = callbackData;
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// Because we need to stake part of the mited value for the pool an part against,
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// we mint two new tokens.
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// Here we assume a minting ratio of 1, and a stakeForAuthor ratio of 0.5
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// Implementing this with adjustable parameters will require more advanced fixed point math.
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// TODO: Make minting ratio an adjustable parameter
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// TODO: Make stakeForAuthor an adjustable parameter
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_mint(post.author, msg.value);
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// TODO: We need a way to exclude this pending reputation from the total supply when computing fee distribution
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_stake(pool, post.author, msg.value / 2, true);
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_stake(pool, post.author, msg.value / 2, false);
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emit ValidationPoolInitiated(poolIndex);
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}
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/// Internal function to register a stake for/against a validation pool
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function _stake(
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ValidationPool storage pool,
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address sender,
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uint256 amount,
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bool inFavor
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) internal {
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require(block.timestamp <= pool.endTime, "Pool end time has passed");
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_transfer(sender, address(this), amount);
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uint stakeIndex = pool.stakeCount++;
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Stake storage s = pool.stakes[stakeIndex];
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s.sender = sender;
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s.inFavor = inFavor;
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s.amount = amount;
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s.id = stakeIndex;
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}
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/// Accept reputation stakes toward a validation pool
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function stake(uint poolIndex, uint256 amount, bool inFavor) public {
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ValidationPool storage pool = validationPools[poolIndex];
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_stake(pool, msg.sender, amount, inFavor);
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}
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/// Evaluate outcome of a validation pool
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function evaluateOutcome(uint poolIndex) public returns (bool votePasses) {
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ValidationPool storage pool = validationPools[poolIndex];
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Post storage post = posts[pool.postIndex];
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require(
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block.timestamp > pool.endTime,
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"Pool end time has not yet arrived"
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);
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require(pool.resolved == false, "Pool is already resolved");
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uint256 stakedFor;
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uint256 stakedAgainst;
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Stake storage s;
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for (uint i = 0; i < pool.stakeCount; i++) {
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s = pool.stakes[i];
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if (s.inFavor) {
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stakedFor += s.amount;
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} else {
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stakedAgainst += s.amount;
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}
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}
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// Here we assume a quorum of 0
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// TODO: Make quorum an adjustable parameter
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// A tie is resolved in favor of the validation pool.
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// This is especially important so that the DAO's first pool can pass,
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// when no reputation has yet been minted.
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votePasses = stakedFor >= stakedAgainst;
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if (votePasses && !isMember[post.author]) {
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members[memberCount++] = post.author;
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isMember[post.author] = true;
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}
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console.log(
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"stakedFor: %d, stakedAgainst: %d, stakeCount: %d",
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stakedFor,
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stakedAgainst,
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pool.stakeCount
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);
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pool.resolved = true;
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pool.outcome = votePasses;
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emit ValidationPoolResolved(poolIndex, votePasses);
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// Value of losing stakes should be di stributed among winners, in proportion to their stakes
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uint256 amountFromWinners = votePasses ? stakedFor : stakedAgainst;
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uint256 amountFromLosers = votePasses ? stakedAgainst : stakedFor;
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uint256 totalRewards;
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for (uint i = 0; i < pool.stakeCount; i++) {
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s = pool.stakes[i];
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if (votePasses == s.inFavor) {
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uint256 reward = (amountFromLosers * s.amount) /
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amountFromWinners;
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_transfer(address(this), s.sender, s.amount + reward);
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totalRewards += reward;
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}
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}
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// Due to rounding, there may be some reward left over. Include this as a reward to the author.
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uint256 remainder = amountFromLosers - totalRewards;
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if (remainder > 0) {
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_transfer(address(this), post.author, remainder);
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}
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// Distribute fee proportionatly among all reputation holders
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for (uint i = 0; i < memberCount; i++) {
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address member = members[i];
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uint256 share = (pool.fee * balanceOf(member)) / totalSupply();
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// TODO: For efficiency this could be modified to hold the funds for recipients to withdraw
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payable(member).transfer(share);
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}
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// Callback if requested
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if (pool.callbackOnValidate) {
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IOnValidate(pool.sender).onValidate(votePasses, pool.callbackData);
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}
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}
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/// Transfer REP to a contract, and call that contract's receiveTransfer method
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function stakeAvailability(
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address to,
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uint256 value,
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uint duration
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) external returns (bool transferred) {
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transferred = super.transfer(to, value);
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if (transferred)
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IAcceptAvailability(to).acceptAvailability(
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msg.sender,
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value,
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duration
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);
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}
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}
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