// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)
pragma solidity ^0.8.20;
/**
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
function _contextSuffixLength() internal view virtual returns (uint256) {
return 0;
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/IERC20.sol)
pragma solidity ^0.8.20;
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
/**
* @dev Returns the value of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the value of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves a `value` amount of tokens from the caller's account to `to`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address to, uint256 value) external returns (bool);
/**
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* zero by default.
*
* This value changes when {approve} or {transferFrom} are called.
*/
function allowance(address owner, address spender) external view returns (uint256);
/**
* @dev Sets a `value` amount of tokens as the allowance of `spender` over the
* caller's tokens.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* IMPORTANT: Beware that changing an allowance with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender's allowance to 0 and set the
* desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
* Emits an {Approval} event.
*/
function approve(address spender, uint256 value) external returns (bool);
/**
* @dev Moves a `value` amount of tokens from `from` to `to` using the
* allowance mechanism. `value` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(address from, address to, uint256 value) external returns (bool);
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.27;
import {Ownable} from "openzeppelin/access/Ownable.sol";
import {IERC20} from "openzeppelin/token/ERC20/IERC20.sol";
import {MerkleProof} from "openzeppelin/utils/cryptography/MerkleProof.sol";
import {ReentrancyGuard} from "openzeppelin/utils/ReentrancyGuard.sol";
/// @title MerkleDistributor
/// @dev A contract for distributing ERC20 tokens based on Merkle tree proofs and whitelisting.
contract MerkleDistributor is Ownable, ReentrancyGuard {
// errors
error NotInWhitelist();
error AlreadyClaimed();
error InvalidProof();
error InvalidAmount();
error LengthNotMatch();
error PausedClaim();
/// @dev Store the Merkle root hashes
bytes32[] public merkleRoots;
/// @dev Interface for the ERC20 token contract
IERC20 public TOKEN;
/// @dev Indicates whether claiming is allowed
bool public canClaim;
/// @dev Mapping to track if an address has already claimed their tokens
mapping(uint256 => mapping(address => bool)) public isClaimed;
/// @dev Mapping to store whitelisted addresses and their corresponding claim amounts
mapping(uint256 => mapping(address => uint256)) public whitelist;
// This event is emitted whenever a successful call to #claim occurs.
event Claimed(uint256 index, address indexed account, uint256 amount);
// Tokens withdrawn
event Withdrawn(address indexed recipient, uint256 amount);
event CanClaimChanged(bool canClaim);
event AddWhitelists(uint256 indexed index, address[] indexed account, uint256[] amount);
event RemoveWhitelists(uint256 indexed index, address[] indexed account);
/// @notice Constructor to initialize the contract
/// @param _merkleRoots Array of Merkle root hashes
/// @param _token Address of the ERC20 token contract
/// @param _owner Address of the contract owner
constructor(bytes32[] memory _merkleRoots, address _token, address _owner) Ownable(_owner) {
merkleRoots = _merkleRoots;
TOKEN = IERC20(_token);
}
/// @dev Modifier to restrict access to whitelisted addresses only
/// @param index The index of the Merkle root being used
modifier onlyWhitelisted(uint256 index) {
require(whitelist[index][msg.sender] > 0, NotInWhitelist()); // Check if the caller is whitelisted
_;
}
/// @notice Set a new Merkle root
/// @param index The index of the Merkle root to set
/// @param _merkleRoot The new Merkle root hash
function setMerkleRoot(uint256 index, bytes32 _merkleRoot) external onlyOwner {
merkleRoots[index] = _merkleRoot;
}
/// @notice Set new Merkle root list
/// @param _merkleRoot The new Merkle root hash
function addMerkleRoot(bytes32 _merkleRoot) external onlyOwner {
merkleRoots.push(_merkleRoot);
}
/// @notice Enable or disable claiming of tokens
/// @param _canClaim Flag to indicate whether claiming is allowed
function setCanClaim(bool _canClaim) external onlyOwner {
canClaim = _canClaim;
emit CanClaimChanged(_canClaim);
}
/// @notice Set a new ERC20 token address
/// @param _token The new token address
function setToken(address _token) external onlyOwner {
TOKEN = IERC20(_token);
}
/**
* @notice Add addresses to the whitelist
* @param index The index for the specified Merkle root
* @param addresses Array of addresses to be added
* @param amounts Corresponding claim amounts for each address
*/
function addToWhitelist(uint256 index, address[] calldata addresses, uint256[] calldata amounts)
external
onlyOwner
{
require(addresses.length == amounts.length, LengthNotMatch());
for (uint256 i = 0; i < addresses.length; i++) {
whitelist[index][addresses[i]] = amounts[i]; // Add address and amount to whitelist
}
emit AddWhitelists(index, addresses, amounts);
}
/**
* @notice Remove addresses from the whitelist
* @param index The index for the specified Merkle root
* @param addresses Array of addresses to be removed
*/
function removeFromWhitelist(uint256 index, address[] calldata addresses) external onlyOwner {
for (uint256 i = 0; i < addresses.length; i++) {
delete whitelist[index][addresses[i]]; // Remove address from whitelist
}
emit RemoveWhitelists(index, addresses);
}
/**
* @notice Claim tokens (only for whitelisted users)
* @dev Users can call this function to claim their allocated tokens
* @param index The index for the specified Merkle root
*/
function claim(uint256 index) external nonReentrant onlyWhitelisted(index) {
require(canClaim, PausedClaim());
require(!isClaimed[index][msg.sender], AlreadyClaimed()); // Check if the user has already claimed
uint256 amount = whitelist[index][msg.sender]; // Get the claimable amount for the user
isClaimed[index][msg.sender] = true; // Mark as claimed
TOKEN.transfer(msg.sender, amount); // Transfer tokens to the user
emit Claimed(index, msg.sender, amount); // Emit event for withdrawal
}
/**
* @notice Claim tokens using Merkle proof
* @param index The index for the specified Merkle root
* @param amount The amount the user wants to claim
* @param merkleProof The Merkle proof for verification
* @dev Users can call this function to claim their tokens with a valid proof
*/
function claim(uint256 index, uint256 amount, bytes32[] calldata merkleProof) external nonReentrant {
require(canClaim, PausedClaim());
require(amount > 0, InvalidAmount()); // Check if the requested amount is valid
require(!isClaimed[index][msg.sender], AlreadyClaimed()); // Check if the user has already claimed
// Verify the Merkle proof
bytes32 _messageHash = keccak256(bytes.concat(keccak256(abi.encode(msg.sender, amount))));
require(MerkleProof.verify(merkleProof, merkleRoots[index], _messageHash), InvalidProof()); // Verify the proof
// Mark as claimed and send the tokens
isClaimed[index][msg.sender] = true;
TOKEN.transfer(msg.sender, amount);
emit Claimed(index, msg.sender, amount); // Emit event for claimed tokens
}
/**
* @notice Withdraw tokens from the contract (only for the contract owner)
* @dev Allows the owner to withdraw any remaining tokens in the contract
*/
function withdraw() external onlyOwner {
uint256 _remainingBalance = TOKEN.balanceOf(address(this)); // Get the remaining token balance of the contract
TOKEN.transfer(msg.sender, _remainingBalance); // Transfer the balance to the contract owner
emit Withdrawn(msg.sender, _remainingBalance); // Emit event for withdrawal
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/cryptography/MerkleProof.sol)
pragma solidity ^0.8.20;
/**
* @dev These functions deal with verification of Merkle Tree proofs.
*
* The tree and the proofs can be generated using our
* https://github.com/OpenZeppelin/merkle-tree[JavaScript library].
* You will find a quickstart guide in the readme.
*
* WARNING: You should avoid using leaf values that are 64 bytes long prior to
* hashing, or use a hash function other than keccak256 for hashing leaves.
* This is because the concatenation of a sorted pair of internal nodes in
* the Merkle tree could be reinterpreted as a leaf value.
* OpenZeppelin's JavaScript library generates Merkle trees that are safe
* against this attack out of the box.
*/
library MerkleProof {
/**
*@dev The multiproof provided is not valid.
*/
error MerkleProofInvalidMultiproof();
/**
* @dev Returns true if a `leaf` can be proved to be a part of a Merkle tree
* defined by `root`. For this, a `proof` must be provided, containing
* sibling hashes on the branch from the leaf to the root of the tree. Each
* pair of leaves and each pair of pre-images are assumed to be sorted.
*/
function verify(bytes32[] memory proof, bytes32 root, bytes32 leaf) internal pure returns (bool) {
return processProof(proof, leaf) == root;
}
/**
* @dev Calldata version of {verify}
*/
function verifyCalldata(bytes32[] calldata proof, bytes32 root, bytes32 leaf) internal pure returns (bool) {
return processProofCalldata(proof, leaf) == root;
}
/**
* @dev Returns the rebuilt hash obtained by traversing a Merkle tree up
* from `leaf` using `proof`. A `proof` is valid if and only if the rebuilt
* hash matches the root of the tree. When processing the proof, the pairs
* of leafs & pre-images are assumed to be sorted.
*/
function processProof(bytes32[] memory proof, bytes32 leaf) internal pure returns (bytes32) {
bytes32 computedHash = leaf;
for (uint256 i = 0; i < proof.length; i++) {
computedHash = _hashPair(computedHash, proof[i]);
}
return computedHash;
}
/**
* @dev Calldata version of {processProof}
*/
function processProofCalldata(bytes32[] calldata proof, bytes32 leaf) internal pure returns (bytes32) {
bytes32 computedHash = leaf;
for (uint256 i = 0; i < proof.length; i++) {
computedHash = _hashPair(computedHash, proof[i]);
}
return computedHash;
}
/**
* @dev Returns true if the `leaves` can be simultaneously proven to be a part of a Merkle tree defined by
* `root`, according to `proof` and `proofFlags` as described in {processMultiProof}.
*
* CAUTION: Not all Merkle trees admit multiproofs. See {processMultiProof} for details.
*/
function multiProofVerify(
bytes32[] memory proof,
bool[] memory proofFlags,
bytes32 root,
bytes32[] memory leaves
) internal pure returns (bool) {
return processMultiProof(proof, proofFlags, leaves) == root;
}
/**
* @dev Calldata version of {multiProofVerify}
*
* CAUTION: Not all Merkle trees admit multiproofs. See {processMultiProof} for details.
*/
function multiProofVerifyCalldata(
bytes32[] calldata proof,
bool[] calldata proofFlags,
bytes32 root,
bytes32[] memory leaves
) internal pure returns (bool) {
return processMultiProofCalldata(proof, proofFlags, leaves) == root;
}
/**
* @dev Returns the root of a tree reconstructed from `leaves` and sibling nodes in `proof`. The reconstruction
* proceeds by incrementally reconstructing all inner nodes by combining a leaf/inner node with either another
* leaf/inner node or a proof sibling node, depending on whether each `proofFlags` item is true or false
* respectively.
*
* CAUTION: Not all Merkle trees admit multiproofs. To use multiproofs, it is sufficient to ensure that: 1) the tree
* is complete (but not necessarily perfect), 2) the leaves to be proven are in the opposite order they are in the
* tree (i.e., as seen from right to left starting at the deepest layer and continuing at the next layer).
*/
function processMultiProof(
bytes32[] memory proof,
bool[] memory proofFlags,
bytes32[] memory leaves
) internal pure returns (bytes32 merkleRoot) {
// This function rebuilds the root hash by traversing the tree up from the leaves. The root is rebuilt by
// consuming and producing values on a queue. The queue starts with the `leaves` array, then goes onto the
// `hashes` array. At the end of the process, the last hash in the `hashes` array should contain the root of
// the Merkle tree.
uint256 leavesLen = leaves.length;
uint256 proofLen = proof.length;
uint256 totalHashes = proofFlags.length;
// Check proof validity.
if (leavesLen + proofLen != totalHashes + 1) {
revert MerkleProofInvalidMultiproof();
}
// The xxxPos values are "pointers" to the next value to consume in each array. All accesses are done using
// `xxx[xxxPos++]`, which return the current value and increment the pointer, thus mimicking a queue's "pop".
bytes32[] memory hashes = new bytes32[](totalHashes);
uint256 leafPos = 0;
uint256 hashPos = 0;
uint256 proofPos = 0;
// At each step, we compute the next hash using two values:
// - a value from the "main queue". If not all leaves have been consumed, we get the next leaf, otherwise we
// get the next hash.
// - depending on the flag, either another value from the "main queue" (merging branches) or an element from the
// `proof` array.
for (uint256 i = 0; i < totalHashes; i++) {
bytes32 a = leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++];
bytes32 b = proofFlags[i]
? (leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++])
: proof[proofPos++];
hashes[i] = _hashPair(a, b);
}
if (totalHashes > 0) {
if (proofPos != proofLen) {
revert MerkleProofInvalidMultiproof();
}
unchecked {
return hashes[totalHashes - 1];
}
} else if (leavesLen > 0) {
return leaves[0];
} else {
return proof[0];
}
}
/**
* @dev Calldata version of {processMultiProof}.
*
* CAUTION: Not all Merkle trees admit multiproofs. See {processMultiProof} for details.
*/
function processMultiProofCalldata(
bytes32[] calldata proof,
bool[] calldata proofFlags,
bytes32[] memory leaves
) internal pure returns (bytes32 merkleRoot) {
// This function rebuilds the root hash by traversing the tree up from the leaves. The root is rebuilt by
// consuming and producing values on a queue. The queue starts with the `leaves` array, then goes onto the
// `hashes` array. At the end of the process, the last hash in the `hashes` array should contain the root of
// the Merkle tree.
uint256 leavesLen = leaves.length;
uint256 proofLen = proof.length;
uint256 totalHashes = proofFlags.length;
// Check proof validity.
if (leavesLen + proofLen != totalHashes + 1) {
revert MerkleProofInvalidMultiproof();
}
// The xxxPos values are "pointers" to the next value to consume in each array. All accesses are done using
// `xxx[xxxPos++]`, which return the current value and increment the pointer, thus mimicking a queue's "pop".
bytes32[] memory hashes = new bytes32[](totalHashes);
uint256 leafPos = 0;
uint256 hashPos = 0;
uint256 proofPos = 0;
// At each step, we compute the next hash using two values:
// - a value from the "main queue". If not all leaves have been consumed, we get the next leaf, otherwise we
// get the next hash.
// - depending on the flag, either another value from the "main queue" (merging branches) or an element from the
// `proof` array.
for (uint256 i = 0; i < totalHashes; i++) {
bytes32 a = leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++];
bytes32 b = proofFlags[i]
? (leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++])
: proof[proofPos++];
hashes[i] = _hashPair(a, b);
}
if (totalHashes > 0) {
if (proofPos != proofLen) {
revert MerkleProofInvalidMultiproof();
}
unchecked {
return hashes[totalHashes - 1];
}
} else if (leavesLen > 0) {
return leaves[0];
} else {
return proof[0];
}
}
/**
* @dev Sorts the pair (a, b) and hashes the result.
*/
function _hashPair(bytes32 a, bytes32 b) private pure returns (bytes32) {
return a < b ? _efficientHash(a, b) : _efficientHash(b, a);
}
/**
* @dev Implementation of keccak256(abi.encode(a, b)) that doesn't allocate or expand memory.
*/
function _efficientHash(bytes32 a, bytes32 b) private pure returns (bytes32 value) {
/// @solidity memory-safe-assembly
assembly {
mstore(0x00, a)
mstore(0x20, b)
value := keccak256(0x00, 0x40)
}
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)
pragma solidity ^0.8.20;
import {Context} from "../utils/Context.sol";
/**
* @dev Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* specific functions.
*
* The initial owner is set to the address provided by the deployer. This can
* later be changed with {transferOwnership}.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be applied to your functions to restrict their use to
* the owner.
*/
abstract contract Ownable is Context {
address private _owner;
/**
* @dev The caller account is not authorized to perform an operation.
*/
error OwnableUnauthorizedAccount(address account);
/**
* @dev The owner is not a valid owner account. (eg. `address(0)`)
*/
error OwnableInvalidOwner(address owner);
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the address provided by the deployer as the initial owner.
*/
constructor(address initialOwner) {
if (initialOwner == address(0)) {
revert OwnableInvalidOwner(address(0));
}
_transferOwnership(initialOwner);
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
_checkOwner();
_;
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view virtual returns (address) {
return _owner;
}
/**
* @dev Throws if the sender is not the owner.
*/
function _checkOwner() internal view virtual {
if (owner() != _msgSender()) {
revert OwnableUnauthorizedAccount(_msgSender());
}
}
/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby disabling any functionality that is only available to the owner.
*/
function renounceOwnership() public virtual onlyOwner {
_transferOwnership(address(0));
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) public virtual onlyOwner {
if (newOwner == address(0)) {
revert OwnableInvalidOwner(address(0));
}
_transferOwnership(newOwner);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Internal function without access restriction.
*/
function _transferOwnership(address newOwner) internal virtual {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/ReentrancyGuard.sol)
pragma solidity ^0.8.20;
/**
* @dev Contract module that helps prevent reentrant calls to a function.
*
* Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
* available, which can be applied to functions to make sure there are no nested
* (reentrant) calls to them.
*
* Note that because there is a single `nonReentrant` guard, functions marked as
* `nonReentrant` may not call one another. This can be worked around by making
* those functions `private`, and then adding `external` `nonReentrant` entry
* points to them.
*
* TIP: If you would like to learn more about reentrancy and alternative ways
* to protect against it, check out our blog post
* https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
*/
abstract contract ReentrancyGuard {
// Booleans are more expensive than uint256 or any type that takes up a full
// word because each write operation emits an extra SLOAD to first read the
// slot's contents, replace the bits taken up by the boolean, and then write
// back. This is the compiler's defense against contract upgrades and
// pointer aliasing, and it cannot be disabled.
// The values being non-zero value makes deployment a bit more expensive,
// but in exchange the refund on every call to nonReentrant will be lower in
// amount. Since refunds are capped to a percentage of the total
// transaction's gas, it is best to keep them low in cases like this one, to
// increase the likelihood of the full refund coming into effect.
uint256 private constant NOT_ENTERED = 1;
uint256 private constant ENTERED = 2;
uint256 private _status;
/**
* @dev Unauthorized reentrant call.
*/
error ReentrancyGuardReentrantCall();
constructor() {
_status = NOT_ENTERED;
}
/**
* @dev Prevents a contract from calling itself, directly or indirectly.
* Calling a `nonReentrant` function from another `nonReentrant`
* function is not supported. It is possible to prevent this from happening
* by making the `nonReentrant` function external, and making it call a
* `private` function that does the actual work.
*/
modifier nonReentrant() {
_nonReentrantBefore();
_;
_nonReentrantAfter();
}
function _nonReentrantBefore() private {
// On the first call to nonReentrant, _status will be NOT_ENTERED
if (_status == ENTERED) {
revert ReentrancyGuardReentrantCall();
}
// Any calls to nonReentrant after this point will fail
_status = ENTERED;
}
function _nonReentrantAfter() private {
// By storing the original value once again, a refund is triggered (see
// https://eips.ethereum.org/EIPS/eip-2200)
_status = NOT_ENTERED;
}
/**
* @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
* `nonReentrant` function in the call stack.
*/
function _reentrancyGuardEntered() internal view returns (bool) {
return _status == ENTERED;
}
}
{
"compilationTarget": {
"src/MerkleDistributor.sol": "MerkleDistributor"
},
"evmVersion": "shanghai",
"libraries": {},
"metadata": {
"bytecodeHash": "ipfs"
},
"optimizer": {
"enabled": true,
"runs": 200
},
"remappings": [
":@forge-std/=lib/forge-std/src/",
":@openzeppelin/contracts/=lib/openzeppelin-contracts/contracts/",
":@solmate/=lib/solmate/src/",
":ds-test/=lib/openzeppelin-contracts/lib/forge-std/lib/ds-test/src/",
":erc4626-tests/=lib/openzeppelin-contracts/lib/erc4626-tests/",
":forge-std/=lib/forge-std/src/",
":openzeppelin-contracts/=lib/openzeppelin-contracts/",
":openzeppelin/=lib/openzeppelin-contracts/contracts/"
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}
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