/**
*Submitted for verification at Etherscan.io on 2021-11-25
*/
/**
*Submitted for verification at polygonscan.com on 2021-11-08
*/
// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.7.6;
interface IERC20 {
/**
* @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);
}
contract MerkleDistributor {
bytes32[] public merkleRoots;
bytes32 public pendingMerkleRoot;
uint256 public lastRoot;
address public constant rewardToken =0x8Ab17e2cd4F894F8641A31f99F673a5762F53c8e;
// admin address which can propose adding a new merkle root
address public proposalAuthority;
// admin address which approves or rejects a proposed merkle root
address public reviewAuthority;
event Claimed(
uint256 merkleIndex,
uint256 index,
address account,
uint256 amount
);
// This is a packed array of booleans.
mapping(uint256 => mapping(uint256 => uint256)) private claimedBitMap;
constructor(address _proposalAuthority, address _reviewAuthority) public {
proposalAuthority = _proposalAuthority;
reviewAuthority = _reviewAuthority;
}
function setProposalAuthority(address _account) public {
require(msg.sender == proposalAuthority);
proposalAuthority = _account;
}
function setReviewAuthority(address _account) public {
require(msg.sender == reviewAuthority);
reviewAuthority = _account;
}
// we modify time between two merkle to10hrs
function proposeMerkleRoot(bytes32 _merkleRoot) public {
require(msg.sender == proposalAuthority);
require(pendingMerkleRoot == 0x00);
require(block.timestamp > lastRoot + 36000);
pendingMerkleRoot = _merkleRoot;
}
// After validating the correctness of the pending merkle root, the reviewing authority
// calls to confirm it and the distribution may begin.
function reviewPendingMerkleRoot(bool _approved) public {
require(msg.sender == reviewAuthority);
require(pendingMerkleRoot != 0x00);
if (_approved) {
merkleRoots.push(pendingMerkleRoot);
lastRoot = block.timestamp;
}
delete pendingMerkleRoot;
}
function isClaimed(uint256 merkleIndex, uint256 index)
public
view
returns (bool)
{
uint256 claimedWordIndex = index / 256;
uint256 claimedBitIndex = index % 256;
uint256 claimedWord = claimedBitMap[merkleIndex][claimedWordIndex];
uint256 mask = (1 << claimedBitIndex);
return claimedWord & mask == mask;
}
function _setClaimed(uint256 merkleIndex, uint256 index) private {
uint256 claimedWordIndex = index / 256;
uint256 claimedBitIndex = index % 256;
claimedBitMap[merkleIndex][claimedWordIndex] =
claimedBitMap[merkleIndex][claimedWordIndex] |
(1 << claimedBitIndex);
}
function claim(
uint256 merkleIndex,
uint256 index,
uint256 amount,
bytes32[] calldata merkleProof
) external {
require(
merkleIndex < merkleRoots.length,
'MerkleDistributor: Invalid merkleIndex'
);
require(
!isClaimed(merkleIndex, index),
'MerkleDistributor: Drop already claimed.'
);
// Verify the merkle proof.
bytes32 node = keccak256(abi.encodePacked(index, msg.sender, amount));
require(
verify(merkleProof, merkleRoots[merkleIndex], node),
'MerkleDistributor: Invalid proof.'
);
// Mark it claimed and send the token.
_setClaimed(merkleIndex, index);
IERC20(rewardToken).transfer(msg.sender, amount);
emit Claimed(merkleIndex, index, msg.sender, amount);
}
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;
}
function recoverFunds(address _token,uint256 _amount) public {
require(msg.sender == reviewAuthority);
IERC20(_token).transfer(msg.sender,_amount);
}
}
{
"compilationTarget": {
"MerkleDistributor.sol": "MerkleDistributor"
},
"evmVersion": "istanbul",
"libraries": {},
"metadata": {
"bytecodeHash": "ipfs"
},
"optimizer": {
"enabled": false,
"runs": 200
},
"remappings": []
}
[{"inputs":[{"internalType":"address","name":"_proposalAuthority","type":"address"},{"internalType":"address","name":"_reviewAuthority","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"merkleIndex","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"index","type":"uint256"},{"indexed":false,"internalType":"address","name":"account","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Claimed","type":"event"},{"inputs":[{"internalType":"uint256","name":"merkleIndex","type":"uint256"},{"internalType":"uint256","name":"index","type":"uint256"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bytes32[]","name":"merkleProof","type":"bytes32[]"}],"name":"claim","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"merkleIndex","type":"uint256"},{"internalType":"uint256","name":"index","type":"uint256"}],"name":"isClaimed","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"lastRoot","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"merkleRoots","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pendingMerkleRoot","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"proposalAuthority","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"_merkleRoot","type":"bytes32"}],"name":"proposeMerkleRoot","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"recoverFunds","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"reviewAuthority","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bool","name":"_approved","type":"bool"}],"name":"reviewPendingMerkleRoot","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"rewardToken","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_account","type":"address"}],"name":"setProposalAuthority","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_account","type":"address"}],"name":"setReviewAuthority","outputs":[],"stateMutability":"nonpayable","type":"function"}]