139 lines
4.7 KiB
Solidity
139 lines
4.7 KiB
Solidity
// SPDX-License-Identifier: MIT
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pragma solidity ^0.8.20;
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import "@openzeppelin/contracts/access/AccessControl.sol";
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import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
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import "../interfaces/IBurnController.sol";
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import "../interfaces/IISO4217WToken.sol";
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/**
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* @title BurnController
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* @notice Controls burning of ISO-4217 W tokens on redemption
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* @dev Burn-before-release sequence for on-demand redemption at par
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*/
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contract BurnController is IBurnController, AccessControl, ReentrancyGuard {
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bytes32 public constant REDEEMER_ROLE = keccak256("REDEEMER_ROLE");
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bytes32 public constant BURNER_ROLE = keccak256("BURNER_ROLE");
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uint256 private _redemptionCounter;
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mapping(address => bool) public isApprovedToken;
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mapping(bytes32 => Redemption) public redemptions;
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struct Redemption {
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address token;
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address redeemer;
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uint256 amount;
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uint256 timestamp;
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bool processed;
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}
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constructor(address admin) {
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_grantRole(DEFAULT_ADMIN_ROLE, admin);
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_grantRole(REDEEMER_ROLE, admin);
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_grantRole(BURNER_ROLE, admin);
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}
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/**
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* @notice Redeem tokens (burn and release fiat)
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* @param token Token address
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* @param from Redeemer address
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* @param amount Amount to redeem (in token decimals)
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* @return redemptionId Redemption ID for tracking
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*/
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function redeem(
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address token,
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address from,
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uint256 amount
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) external override nonReentrant onlyRole(REDEEMER_ROLE) returns (bytes32 redemptionId) {
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require(isApprovedToken[token], "BurnController: token not approved");
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require(amount > 0, "BurnController: zero amount");
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require(from != address(0), "BurnController: zero address");
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// Check if redemption is allowed
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require(this.canRedeem(token, amount), "BurnController: redemption not allowed");
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// Burn tokens (atomic burn-before-release sequence)
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IISO4217WToken tokenContract = IISO4217WToken(token);
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tokenContract.burn(from, amount);
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// Generate redemption ID
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_redemptionCounter++;
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redemptionId = keccak256(abi.encodePacked(token, from, amount, _redemptionCounter, block.timestamp));
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// Record redemption
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redemptions[redemptionId] = Redemption({
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token: token,
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redeemer: from,
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amount: amount,
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timestamp: block.timestamp,
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processed: true
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});
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// Note: Fiat release happens off-chain or via separate payment system
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// This contract handles the token burn portion
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emit Redeemed(token, from, amount, redemptionId);
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}
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/**
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* @notice Burn tokens without redemption (emergency/transfer)
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* @param token Token address
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* @param from Source address
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* @param amount Amount to burn
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*/
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function burn(address token, address from, uint256 amount) external override nonReentrant onlyRole(BURNER_ROLE) {
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require(isApprovedToken[token], "BurnController: token not approved");
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require(amount > 0, "BurnController: zero amount");
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IISO4217WToken tokenContract = IISO4217WToken(token);
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tokenContract.burn(from, amount);
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emit Burned(token, from, amount);
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}
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/**
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* @notice Check if redemption is allowed
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* @param token Token address
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* @param amount Amount to redeem
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* @return redeemable True if redemption is allowed
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*/
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function canRedeem(address token, uint256 amount) external view override returns (bool redeemable) {
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if (!isApprovedToken[token]) {
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return false;
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}
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IISO4217WToken tokenContract = IISO4217WToken(token);
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uint256 totalSupply = tokenContract.totalSupply();
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// Redemption is allowed if supply >= amount
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// Additional checks (e.g., reserve sufficiency) would be added here
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return totalSupply >= amount;
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}
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/**
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* @notice Approve a token for burning/redemption
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* @param token Token address
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*/
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function approveToken(address token) external onlyRole(DEFAULT_ADMIN_ROLE) {
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isApprovedToken[token] = true;
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}
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/**
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* @notice Revoke token approval
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* @param token Token address
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*/
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function revokeToken(address token) external onlyRole(DEFAULT_ADMIN_ROLE) {
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isApprovedToken[token] = false;
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}
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/**
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* @notice Get redemption information
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* @param redemptionId Redemption ID
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* @return redemption Redemption struct
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*/
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function getRedemption(bytes32 redemptionId) external view returns (Redemption memory redemption) {
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return redemptions[redemptionId];
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}
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}
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