Warning! Contract bytecode has been changed and doesn't match the verified one. Therefore, interaction with this smart contract may be risky.
- Contract name:
- PromoVault2
- Optimization enabled
- true
- Compiler version
- v0.8.19+commit.7dd6d404
- Optimization runs
- 200
- EVM Version
- default
- Verified at
- 2024-09-26T15:33:50.988087Z
Contract source code
// SPDX-License-Identifier: No License (None)
pragma solidity 0.8.19;
// helper methods for interacting with ERC20 tokens and sending ETH that do not consistently return true/false
library TransferHelper {
function safeApprove(address token, address to, uint value) internal {
// bytes4(keccak256(bytes('approve(address,uint256)')));
(bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x095ea7b3, to, value));
require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: APPROVE_FAILED');
}
function safeTransfer(address token, address to, uint value) internal {
// bytes4(keccak256(bytes('transfer(address,uint256)')));
(bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value));
require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: TRANSFER_FAILED');
}
function safeTransferFrom(address token, address from, address to, uint value) internal {
// bytes4(keccak256(bytes('transferFrom(address,address,uint256)')));
(bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));
require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: TRANSFER_FROM_FAILED');
}
function safeTransferETH(address to, uint value) internal {
(bool success,) = to.call{value:value}(new bytes(0));
require(success, 'TransferHelper: ETH_TRANSFER_FAILED');
}
}
abstract contract Ownable {
address internal _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor () {
_owner = msg.sender;
emit OwnershipTransferred(address(0), msg.sender);
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view virtual returns (address) {
return _owner;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(owner() == msg.sender, "Ownable: caller is not the owner");
_;
}
/**
* @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 {
require(newOwner != address(0), "Ownable: new owner is the zero address");
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
}
interface IERC20 {
function balanceOf(address account) external view returns (uint256);
}
contract PromoVault2 is Ownable {
using TransferHelper for address;
struct Airdrop {
uint128 balance; // available airdrop balance
uint64 vestingDate; // after this date when tokens can be claimed
uint64 deadline; // until this date tokens can be claimed
address token; // airdrop token
}
mapping(address signer => Airdrop) public airdrops;
mapping(bytes32 messageHash => bool processed) public isProcessed; // record processed messages
event VaultTransfer(address indexed token, address indexed signer, address indexed from, address to, uint256 value, uint256 nonce);
event CreateAirdrop(address signer, address token, uint256 amount);
event CloseAirdrop(address signer, address receiver, uint256 amount);
event Rescue(address _token, uint256 _amount);
bool public isPaused;
modifier isNotPaused() {
require(!isPaused, "is paused");
_;
}
function setPause(bool pause) external onlyOwner {
isPaused = pause;
}
function createAirdrop(
address token, // airdrop token
uint256 amount, // amount of tokens for airdrop
address signer // unique signer for this airdrop
) external isNotPaused {
require(signer != address(0) && airdrops[signer].token == address(0), "signer already was used");
airdrops[signer].token = token;
uint256 balance = IERC20(token).balanceOf(address(this));
token.safeTransferFrom(msg.sender, address(this), amount);
amount = IERC20(token).balanceOf(address(this)) - balance;
require(amount < 2**128, "too big amount");
airdrops[signer].balance = uint128(amount);
emit CreateAirdrop(signer, token, amount);
}
/*
// to sign message on the server-side use:
var vault = new web3.eth.Contract(VaultContractABI, VaultContractAddress);
var nonce = await vault.methods.nonces(from).call();
var messageHash = web3.utils.soliditySha3(signer, token, from, value, nonce, ChainId, VaultContractAddress);
var signature = web3.eth.accounts.sign(messageHash, PrivateKey);
*/
// claim promo tokens from vault to user's address. Can be called by any wallet
function claimTokens(
address signer, // signer of airdrop
address to, // transfer to address (user's address who received airdrop)
uint256 value, // amount of tokens to transfer
uint256 nonce, // nonce is used to if you need to airdrop tokens to the same user many times
bytes memory signature
) external isNotPaused {
claim(signer, to, to, value, nonce, signature);
}
// user transfers promo tokens from vault to some address. Must be called by user who received airdrop
function transferTokens(
address signer, // signer of airdrop
address to, // transfer to address (any address)
uint256 value, // amount of tokens to transfer
uint256 nonce, // nonce is used to if you need to airdrop tokens to the same user many times
bytes memory signature
) external isNotPaused {
claim(signer, msg.sender, to, value, nonce, signature);
}
function claim(
address signer, // signer of airdrop
address from, // transfer from address
address to, // transfer to address
uint256 value, // amount of tokens to transfer
uint256 nonce, // nonce is used to if you need to airdrop tokens to the same user many times
bytes memory signature
) internal {
Airdrop memory a = airdrops[signer];
require(a.token != address(0) && signer != address(0), "closed");
require(a.balance >= value, "Not enough tokens");
require(a.vestingDate <= block.timestamp, "under vesting");
require(a.deadline == 0 || a.deadline >= block.timestamp, "expired");
bytes32 messageHash = keccak256(
abi.encodePacked(
signer,
a.token,
from,
value,
nonce,
block.chainid,
address(this)
)
);
messageHash = prefixed(messageHash);
require(!isProcessed[messageHash], "already claimed");
require(signer == recoverSigner(messageHash, signature), "wrong signature");
isProcessed[messageHash] = true;
airdrops[signer].balance = a.balance - uint128(value);
a.token.safeTransfer(to, value);
emit VaultTransfer(a.token, signer, from, to, value, nonce);
}
function splitSignature(bytes memory sig)
internal
pure
returns (
uint8 v,
bytes32 r,
bytes32 s
)
{
require(sig.length == 65);
assembly {
// first 32 bytes, after the length prefix
r := mload(add(sig, 32))
// second 32 bytes
s := mload(add(sig, 64))
// final byte (first byte of the next 32 bytes)
v := byte(0, mload(add(sig, 96)))
}
}
function recoverSigner(bytes32 message, bytes memory sig)
internal
pure
returns (address)
{
uint8 v;
bytes32 r;
bytes32 s;
(v, r, s) = splitSignature(sig);
return ecrecover(message, v, r, s);
}
// Builds a prefixed hash to mimic the behavior of eth_sign.
function prefixed(bytes32 hash) internal pure returns (bytes32) {
return
keccak256(
abi.encodePacked("\x19Ethereum Signed Message:\n32", hash)
);
}
/*
// ERC223 callback
function tokenReceived(address, uint, bytes calldata) external pure returns(bytes4) {
return this.tokenReceived.selector;
}
*/
// owner can close airdrop before all tokens is claimed and transfer leftover tokens to receiver address
function closeAirdrop(address signer, address receiver) external onlyOwner {
Airdrop memory a = airdrops[signer];
require(a.token != address(0) && signer != address(0), "closed");
require(a.balance != 0, "Not enough tokens");
a.token.safeTransfer(receiver, uint256(a.balance));
airdrops[signer].balance = 0;
emit CloseAirdrop(signer, receiver, uint256(a.balance));
}
// allow owner to rescue tokens from contract
function rescueTokens(address token, uint256 amount) onlyOwner external {
if (token == address(0)) {
msg.sender.safeTransferETH(amount);
} else {
token.safeTransfer(msg.sender, amount);
}
emit Rescue(token, amount);
}
}
Contract ABI
[{"type":"event","name":"CloseAirdrop","inputs":[{"type":"address","name":"signer","internalType":"address","indexed":false},{"type":"address","name":"receiver","internalType":"address","indexed":false},{"type":"uint256","name":"amount","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"CreateAirdrop","inputs":[{"type":"address","name":"signer","internalType":"address","indexed":false},{"type":"address","name":"token","internalType":"address","indexed":false},{"type":"uint256","name":"amount","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"OwnershipTransferred","inputs":[{"type":"address","name":"previousOwner","internalType":"address","indexed":true},{"type":"address","name":"newOwner","internalType":"address","indexed":true}],"anonymous":false},{"type":"event","name":"Rescue","inputs":[{"type":"address","name":"_token","internalType":"address","indexed":false},{"type":"uint256","name":"_amount","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"VaultTransfer","inputs":[{"type":"address","name":"token","internalType":"address","indexed":true},{"type":"address","name":"signer","internalType":"address","indexed":true},{"type":"address","name":"from","internalType":"address","indexed":true},{"type":"address","name":"to","internalType":"address","indexed":false},{"type":"uint256","name":"value","internalType":"uint256","indexed":false},{"type":"uint256","name":"nonce","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"function","stateMutability":"view","outputs":[{"type":"uint128","name":"balance","internalType":"uint128"},{"type":"uint64","name":"vestingDate","internalType":"uint64"},{"type":"uint64","name":"deadline","internalType":"uint64"},{"type":"address","name":"token","internalType":"address"}],"name":"airdrops","inputs":[{"type":"address","name":"signer","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"claimTokens","inputs":[{"type":"address","name":"signer","internalType":"address"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"value","internalType":"uint256"},{"type":"uint256","name":"nonce","internalType":"uint256"},{"type":"bytes","name":"signature","internalType":"bytes"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"closeAirdrop","inputs":[{"type":"address","name":"signer","internalType":"address"},{"type":"address","name":"receiver","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"createAirdrop","inputs":[{"type":"address","name":"token","internalType":"address"},{"type":"uint256","name":"amount","internalType":"uint256"},{"type":"address","name":"signer","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"isPaused","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"bool","name":"processed","internalType":"bool"}],"name":"isProcessed","inputs":[{"type":"bytes32","name":"messageHash","internalType":"bytes32"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"owner","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"rescueTokens","inputs":[{"type":"address","name":"token","internalType":"address"},{"type":"uint256","name":"amount","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setPause","inputs":[{"type":"bool","name":"pause","internalType":"bool"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"transferOwnership","inputs":[{"type":"address","name":"newOwner","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"transferTokens","inputs":[{"type":"address","name":"signer","internalType":"address"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"value","internalType":"uint256"},{"type":"uint256","name":"nonce","internalType":"uint256"},{"type":"bytes","name":"signature","internalType":"bytes"}]}]
Contract Creation Code
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