rln-contract/contracts/Rln.sol

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2022-06-23 13:36:10 +00:00
pragma solidity 0.7.4;
import { IPoseidonHasher } from "./PoseidonHasher.sol";
contract RLN {
uint256 public immutable MEMBERSHIP_DEPOSIT;
uint256 public immutable DEPTH;
uint256 public immutable SET_SIZE;
uint256 public pubkeyIndex = 0;
mapping(uint256 => uint256) public members;
IPoseidonHasher public poseidonHasher;
event MemberRegistered(uint256 pubkey, uint256 indexed index);
event MemberWithdrawn(uint256 pubkey, uint256 indexed index);
constructor(
uint256 membershipDeposit,
uint256 depth,
address _poseidonHasher
) public {
MEMBERSHIP_DEPOSIT = membershipDeposit;
DEPTH = depth;
SET_SIZE = 1 << depth;
poseidonHasher = IPoseidonHasher(_poseidonHasher);
}
function register(uint256 pubkey) external payable {
require(pubkeyIndex < SET_SIZE, "RLN, register: set is full");
require(msg.value == MEMBERSHIP_DEPOSIT, "RLN, register: membership deposit is not satisfied");
_register(pubkey);
}
function registerBatch(uint256[] calldata pubkeys) external payable {
require(pubkeyIndex + pubkeys.length <= SET_SIZE, "RLN, registerBatch: set is full");
require(msg.value == MEMBERSHIP_DEPOSIT * pubkeys.length, "RLN, registerBatch: membership deposit is not satisfied");
for (uint256 i = 0; i < pubkeys.length; i++) {
_register(pubkeys[i]);
}
}
function _register(uint256 pubkey) internal {
members[pubkeyIndex] = pubkey;
emit MemberRegistered(pubkey, pubkeyIndex);
pubkeyIndex += 1;
}
function withdrawBatch(
uint256[] calldata secrets,
uint256[] calldata pubkeyIndexes,
address payable[] calldata receivers
) external {
uint256 batchSize = secrets.length;
require(batchSize != 0, "RLN, withdrawBatch: batch size zero");
require(batchSize == pubkeyIndexes.length, "RLN, withdrawBatch: batch size mismatch pubkey indexes");
require(batchSize == receivers.length, "RLN, withdrawBatch: batch size mismatch receivers");
for (uint256 i = 0; i < batchSize; i++) {
_withdraw(secrets[i], pubkeyIndexes[i], receivers[i]);
}
}
function withdraw(
uint256 secret,
uint256 _pubkeyIndex,
address payable receiver
) external {
_withdraw(secret, _pubkeyIndex, receiver);
}
function _withdraw(
uint256 secret,
uint256 _pubkeyIndex,
address payable receiver
) internal {
require(_pubkeyIndex < SET_SIZE, "RLN, _withdraw: invalid pubkey index");
require(members[_pubkeyIndex] != 0, "RLN, _withdraw: member doesn't exist");
require(receiver != address(0), "RLN, _withdraw: empty receiver address");
// derive public key
uint256 pubkey = hash([secret, 0]);
require(members[_pubkeyIndex] == pubkey, "RLN, _withdraw: not verified");
// delete member
members[_pubkeyIndex] = 0;
// refund deposit
receiver.transfer(MEMBERSHIP_DEPOSIT);
emit MemberWithdrawn(pubkey, _pubkeyIndex);
}
function hash(uint256[2] memory input) internal view returns (uint256) {
return poseidonHasher.hash(input);
}
}