false
false
0

Contract Address Details

0x1Ca7A00C6c9d43fBA233Ac57f819B4014940a9Cf

Contract Name
PromoVault2
Creator
0xc7d98c–7f3521 at 0x29d6fc–4bc292
Balance
0 CLO
Tokens
Fetching tokens...
Transactions
Fetching transactions...
Transfers
Fetching transfers...
Gas Used
Fetching gas used...
Last Balance Update
16288065
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
2024-09-26T15:33:48.826780Z

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 tokens can be claimed
        uint64 deadline;    // until this date tokens can be claimed, 0 means "without deadline" 
        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
        uint64 vestingDate, // after this date tokens can be claimed
        uint64 deadline    // until this date tokens can be claimed, 0 means "without deadline" 
    ) external isNotPaused {
        require(signer != address(0) && airdrops[signer].token == address(0), "signer already was used");
        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] = Airdrop(uint128(amount), vestingDate, deadline, token);
        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":"uint64","name":"vestingDate","internalType":"uint64"},{"type":"uint64","name":"deadline","internalType":"uint64"}]},{"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

Verify & Publish 
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