// SPDX-License-Identifier: MIT
// File: @openzeppelin/contracts/math/SafeMath.sol
pragma solidity ^0.6.0;
/**
* @dev Wrappers over Solidity's arithmetic operations with added overflow
* checks.
*
* Arithmetic operations in Solidity wrap on overflow. This can easily result
* in bugs, because programmers usually assume that an overflow raises an
* error, which is the standard behavior in high level programming languages.
* `SafeMath` restores this intuition by reverting the transaction when an
* operation overflows.
*
* Using this library instead of the unchecked operations eliminates an entire
* class of bugs, so it's recommended to use it always.
*/
library SafeMath {
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
*
* - Addition cannot overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return sub(a, b, "SafeMath: subtraction overflow");
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b <= a, errorMessage);
uint256 c = a - b;
return c;
}
/**
* @dev Returns the multiplication of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `*` operator.
*
* Requirements:
*
* - Multiplication cannot overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
if (a == 0) {
return 0;
}
uint256 c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
return c;
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return div(a, b, "SafeMath: division by zero");
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts with custom message on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b > 0, errorMessage);
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
return mod(a, b, "SafeMath: modulo by zero");
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts with custom message when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b != 0, errorMessage);
return a % b;
}
}
// File: @openzeppelin/contracts/token/ERC20/IERC20.sol
pragma solidity ^0.6.0;
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @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);
/**
* @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 `amount` 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 amount) external returns (bool);
/**
* @dev Moves `amount` tokens from `sender` to `recipient` using the
* allowance mechanism. `amount` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
/**
* @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);
}
// File: @openzeppelin/contracts/utils/Address.sol
pragma solidity ^0.6.2;
/**
* @dev Collection of functions related to the address type
*/
library Address {
/**
* @dev Returns true if `account` is a contract.
*
* [IMPORTANT]
* ====
* It is unsafe to assume that an address for which this function returns
* false is an externally-owned account (EOA) and not a contract.
*
* Among others, `isContract` will return false for the following
* types of addresses:
*
* - an externally-owned account
* - a contract in construction
* - an address where a contract will be created
* - an address where a contract lived, but was destroyed
* ====
*/
function isContract(address account) internal view returns (bool) {
// This method relies in extcodesize, which returns 0 for contracts in
// construction, since the code is only stored at the end of the
// constructor execution.
uint256 size;
// solhint-disable-next-line no-inline-assembly
assembly { size := extcodesize(account) }
return size > 0;
}
/**
* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
* `recipient`, forwarding all available gas and reverting on errors.
*
* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
* of certain opcodes, possibly making contracts go over the 2300 gas limit
* imposed by `transfer`, making them unable to receive funds via
* `transfer`. {sendValue} removes this limitation.
*
* https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* {ReentrancyGuard} or the
* https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
// solhint-disable-next-line avoid-low-level-calls, avoid-call-value
(bool success, ) = recipient.call{ value: amount }("");
require(success, "Address: unable to send value, recipient may have reverted");
}
/**
* @dev Performs a Solidity function call using a low level `call`. A
* plain`call` is an unsafe replacement for a function call: use this
* function instead.
*
* If `target` reverts with a revert reason, it is bubbled up by this
* function (like regular Solidity function calls).
*
* Returns the raw returned data. To convert to the expected return value,
* use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
*
* Requirements:
*
* - `target` must be a contract.
* - calling `target` with `data` must not revert.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
return functionCall(target, data, "Address: low-level call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
* `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
return _functionCallWithValue(target, data, 0, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but also transferring `value` wei to `target`.
*
* Requirements:
*
* - the calling contract must have an ETH balance of at least `value`.
* - the called Solidity function must be `payable`.
*
* _Available since v3.1._
*/
function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
}
/**
* @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
* with `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
require(address(this).balance >= value, "Address: insufficient balance for call");
return _functionCallWithValue(target, data, value, errorMessage);
}
function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
require(isContract(target), "Address: call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
if (success) {
return returndata;
} else {
// Look for revert reason and bubble it up if present
if (returndata.length > 0) {
// The easiest way to bubble the revert reason is using memory via assembly
// solhint-disable-next-line no-inline-assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol
pragma solidity ^0.6.0;
/**
* @title SafeERC20
* @dev Wrappers around ERC20 operations that throw on failure (when the token
* contract returns false). Tokens that return no value (and instead revert or
* throw on failure) are also supported, non-reverting calls are assumed to be
* successful.
* To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
* which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
*/
library SafeERC20 {
using SafeMath for uint256;
using Address for address;
function safeTransfer(IERC20 token, address to, uint256 value) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
}
function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
}
/**
* @dev Deprecated. This function has issues similar to the ones found in
* {IERC20-approve}, and its usage is discouraged.
*
* Whenever possible, use {safeIncreaseAllowance} and
* {safeDecreaseAllowance} instead.
*/
function safeApprove(IERC20 token, address spender, uint256 value) internal {
// safeApprove should only be called when setting an initial allowance,
// or when resetting it to zero. To increase and decrease it, use
// 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
// solhint-disable-next-line max-line-length
require((value == 0) || (token.allowance(address(this), spender) == 0),
"SafeERC20: approve from non-zero to non-zero allowance"
);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
}
function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 newAllowance = token.allowance(address(this), spender).add(value);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
/**
* @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
* on the return value: the return value is optional (but if data is returned, it must not be false).
* @param token The token targeted by the call.
* @param data The call data (encoded using abi.encode or one of its variants).
*/
function _callOptionalReturn(IERC20 token, bytes memory data) private {
// We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
// we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
// the target address contains contract code and also asserts for success in the low-level call.
bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
if (returndata.length > 0) { // Return data is optional
// solhint-disable-next-line max-line-length
require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
}
}
}
// File: @openzeppelin/contracts/cryptography/MerkleProof.sol
pragma solidity ^0.6.0;
/**
* @dev These functions deal with verification of Merkle trees (hash trees),
*/
library MerkleProof {
/**
* @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) {
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;
}
}
// File: contracts/interfaces/IMerkleBox.sol
pragma solidity 0.6.12;
interface IMerkleBox {
event NewMerkle(
address indexed sender,
address indexed erc20,
uint256 amount,
bytes32 indexed merkleRoot,
uint256 claimGroupId,
uint256 withdrawUnlockTime,
string memo
);
event MerkleClaim(address indexed account, address indexed erc20, uint256 amount);
event MerkleFundUpdate(address indexed funder, bytes32 indexed merkleRoot, uint256 claimGroupId, uint256 amount, bool withdraw);
function addFunds(uint256 claimGroupId, uint256 amount) external;
function addFundsWithPermit(
uint256 claimGroupId,
address funder,
uint256 amount,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) external;
function withdrawFunds(uint256 claimGroupId, uint256 amount) external;
function newClaimsGroup(
address erc20,
uint256 amount,
bytes32 merkleRoot,
uint256 withdrawUnlockTime,
string calldata memo
) external returns (uint256);
function isClaimable(
uint256 claimGroupId,
address account,
uint256 amount,
bytes32[] memory proof
) external view returns (bool);
function claim(
uint256 claimGroupId,
address account,
uint256 amount,
bytes32[] memory proof
) external;
}
// File: contracts/interfaces/IERC20WithPermit.sol
pragma solidity 0.6.12;
interface IERC20WithPermit is IERC20 {
function permit(
address,
address,
uint256,
uint256,
uint8,
bytes32,
bytes32
) external;
}
// File: contracts/MerkleBox.sol
pragma solidity 0.6.12;
contract MerkleBox is IMerkleBox {
using MerkleProof for MerkleProof;
using SafeERC20 for IERC20;
using SafeERC20 for IERC20WithPermit;
using SafeMath for uint256;
struct Holding {
address owner; // account that contributed funds
address erc20; // claim-able ERC20 asset
uint256 balance; // amount of token held currently
bytes32 merkleRoot; // root of claims merkle tree
uint256 withdrawUnlockTime; // withdraw forbidden before this time
string memo; // an string to store arbitary notes about the holding
}
mapping(uint256 => Holding) public holdings;
mapping(address => uint256[]) public claimGroupIds;
mapping(uint256 => mapping(bytes32 => bool)) public leafClaimed;
uint256 public constant LOCKING_PERIOD = 30 days;
uint256 public claimGroupCount;
function addFunds(uint256 claimGroupId, uint256 amount) external override {
// prelim. parameter checks
require(amount != 0, "Invalid amount");
// reference our struct storage
Holding storage holding = holdings[claimGroupId];
require(holding.owner != address(0), "Holding does not exist");
// calculate amount to deposit. handle deposit-all.
IERC20 token = IERC20(holding.erc20);
uint256 balance = token.balanceOf(msg.sender);
if (amount == uint256(-1)) {
amount = balance;
}
require(amount <= balance, "Insufficient balance");
require(amount != 0, "Amount cannot be zero");
// transfer token to this contract
token.safeTransferFrom(msg.sender, address(this), amount);
// update holdings record
holding.balance = holding.balance.add(amount);
emit MerkleFundUpdate(msg.sender, holding.merkleRoot, claimGroupId, amount, false);
}
function addFundsWithPermit(
uint256 claimGroupId,
address funder,
uint256 amount,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) external override {
// prelim. parameter checks
require(amount != 0, "Invalid amount");
// reference our struct storage
Holding storage holding = holdings[claimGroupId];
require(holding.owner != address(0), "Holding does not exist");
// calculate amount to deposit. handle deposit-all.
IERC20WithPermit token = IERC20WithPermit(holding.erc20);
uint256 balance = token.balanceOf(funder);
if (amount == uint256(-1)) {
amount = balance;
}
require(amount <= balance, "Insufficient balance");
require(amount != 0, "Amount cannot be zero");
// transfer token to this contract
token.permit(funder, address(this), amount, deadline, v, r, s);
token.safeTransferFrom(funder, address(this), amount);
// update holdings record
holding.balance = holding.balance.add(amount);
emit MerkleFundUpdate(funder, holding.merkleRoot, claimGroupId, amount, false);
}
function withdrawFunds(uint256 claimGroupId, uint256 amount) external override {
// reference our struct storage
Holding storage holding = holdings[claimGroupId];
require(holding.owner != address(0), "Holding does not exist");
require(block.timestamp >= holding.withdrawUnlockTime, "Holdings may not be withdrawn");
require(holding.owner == msg.sender, "Only owner may withdraw");
// calculate amount to withdraw. handle withdraw-all.
IERC20 token = IERC20(holding.erc20);
if (amount == uint256(-1)) {
amount = holding.balance;
}
require(amount <= holding.balance, "Insufficient balance");
// update holdings record
holding.balance = holding.balance.sub(amount);
// transfer token to this contract
token.safeTransfer(msg.sender, amount);
emit MerkleFundUpdate(msg.sender, holding.merkleRoot, claimGroupId, amount, true);
}
function newClaimsGroup(
address erc20,
uint256 amount,
bytes32 merkleRoot,
uint256 withdrawUnlockTime,
string calldata memo
) external override returns (uint256) {
// prelim. parameter checks
require(erc20 != address(0), "Invalid ERC20 address");
require(merkleRoot != 0, "Merkle cannot be zero");
require(withdrawUnlockTime >= block.timestamp + LOCKING_PERIOD, "Holding lock must exceed minimum lock period");
claimGroupCount++;
// reference our struct storage
Holding storage holding = holdings[claimGroupCount];
// calculate amount to deposit. handle deposit-all.
IERC20 token = IERC20(erc20);
uint256 balance = token.balanceOf(msg.sender);
if (amount == uint256(-1)) {
amount = balance;
}
require(amount <= balance, "Insufficient balance");
require(amount != 0, "Amount cannot be zero");
// transfer token to this contract
token.safeTransferFrom(msg.sender, address(this), amount);
// record holding in stable storage
holding.owner = msg.sender;
holding.erc20 = erc20;
holding.balance = amount;
holding.merkleRoot = merkleRoot;
holding.withdrawUnlockTime = withdrawUnlockTime;
holding.memo = memo;
claimGroupIds[msg.sender].push(claimGroupCount);
emit NewMerkle(msg.sender, erc20, amount, merkleRoot, claimGroupCount, withdrawUnlockTime, memo);
return claimGroupCount;
}
function isClaimable(
uint256 claimGroupId,
address account,
uint256 amount,
bytes32[] memory proof
) external view override returns (bool) {
// holding exists?
Holding memory holding = holdings[claimGroupId];
if (holding.owner == address(0)) {
return false;
}
// holding owner?
if (holding.owner == account) {
return false;
}
// sufficient balance exists? (funder may have under-funded)
if (holding.balance < amount) {
return false;
}
bytes32 leaf = _leafHash(account, amount);
// already claimed?
if (leafClaimed[claimGroupId][leaf]) {
return false;
}
// merkle proof is invalid or claim not found
if (!MerkleProof.verify(proof, holding.merkleRoot, leaf)) {
return false;
}
return true;
}
function claim(
uint256 claimGroupId,
address account,
uint256 amount,
bytes32[] memory proof
) external override {
// holding exists?
Holding storage holding = holdings[claimGroupId];
require(holding.owner != address(0), "Holding not found");
// holding owner?
require(holding.owner != account, "Holding owner cannot claim");
// sufficient balance exists? (funder may have under-funded)
require(holding.balance >= amount, "Claim under-funded by funder.");
bytes32 leaf = _leafHash(account, amount);
// already spent?
require(leafClaimed[claimGroupId][leaf] == false, "Already claimed");
// merkle proof valid?
require(MerkleProof.verify(proof, holding.merkleRoot, leaf) == true, "Claim not found");
// update state
leafClaimed[claimGroupId][leaf] = true;
holding.balance = holding.balance.sub(amount);
IERC20(holding.erc20).safeTransfer(account, amount);
emit MerkleClaim(account, holding.erc20, amount);
}
function getClaimGroupIds(address owner) public view returns (uint256[] memory ids) {
ids = claimGroupIds[owner];
}
//////////////////////////////////////////////////////////
// generate hash of (claim holder, amount)
// claim holder must be the caller
function _leafHash(address account, uint256 amount) internal pure returns (bytes32) {
return keccak256(abi.encodePacked(account, amount));
}
}
{
"compilationTarget": {
"browser/MerkleBox.sol": "MerkleBox"
},
"evmVersion": "istanbul",
"libraries": {},
"metadata": {
"bytecodeHash": "ipfs"
},
"optimizer": {
"enabled": true,
"runs": 20
},
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}
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