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// SPDX-License-Identifier: MIT
pragma solidity 0.8.29;

/// @title Interface for ERC20 token interactions
/// @notice Defines minimal ERC20 functions needed for airdrop operations
interface IERC20 {
    /// @notice Transfers tokens to a specified address
    /// @param to The address to transfer to
    /// @param amount The amount of tokens to transfer
    /// @return success True if the transfer succeeded
    function transfer(address to, uint256 amount) external returns (bool);

    /// @notice Transfers tokens from one address to another
    /// @param from The address to transfer from
    /// @param to The address to transfer to
    /// @param amount The amount of tokens to transfer
    /// @return success True if the transfer succeeded
    function transferFrom(address from, address to, uint256 amount) external returns (bool);

    /// @notice Returns the token balance of an account
    /// @param account The address to query
    /// @return balance The token balance of the account
    function balanceOf(address account) external view returns (uint256);
}

/// @title WhalePodDrop
/// @author SpaceMuppet
/// @notice Enables gas-optimized airdrops for ERC20 tokens and native Sonic (S) on the Sonic blockchain,
///         pulling tokens or S from the sender and distributing them in a single transaction.
/// @dev Designed for high throughput with automatic refunds on failure.
contract WhalePodDrop {
    /// @notice Address of the contract deployer, immutable for security
    address public immutable owner;

    /// @notice Thrown when input validation fails
    /// @param reason Description of the validation failure
    error InvalidInput(string reason);

    /// @notice Thrown when a token transfer fails
    /// @param recipient Address that failed to receive tokens
    /// @param amount Amount that failed to transfer
    error TransferFailed(address recipient, uint256 amount);

    /// @notice Thrown when refunding tokens to the sender fails
    /// @param sender Address that failed to receive the refund
    /// @param amount Amount that failed to refund
    error RefundFailed(address sender, uint256 amount);

    /// @notice Emitted when an airdrop successfully completes
    /// @param sender Address initiating the airdrop
    /// @param totalRecipients Number of recipients processed
    /// @param totalAmount Total tokens or S distributed
    event AirdropExecuted(address indexed sender, uint256 totalRecipients, uint256 totalAmount);

    /// @notice Emitted when tokens or S are deposited from the sender
    /// @param sender Address depositing tokens or S
    /// @param amount Amount of tokens or S deposited
    event FundsDeposited(address indexed sender, uint256 amount);

    /// @notice Emitted when the owner withdraws tokens or S in an emergency
    /// @param owner Address receiving the withdrawn tokens or S
    /// @param amount Amount of tokens or S withdrawn
    event EmergencyWithdrawal(address indexed owner, uint256 amount);

    /// @notice Restricts function access to the contract owner
    modifier onlyOwner() {
        if (msg.sender != owner) revert InvalidInput("Caller is not the owner");
        _;
    }

    /// @notice Prevents reentrant calls to sensitive functions
    modifier nonReentrant() {
        if (_locked) revert InvalidInput("Reentrant call");
        _locked = true;
        _;
        _locked = false;
    }

    bool private _locked;

    /// @notice Maximum number of recipients per airdrop to limit gas usage
    uint256 private constant MAX_RECIPIENTS = 1000;

    /// @notice Initializes the contract with the deployer as the owner
    constructor() {
        owner = msg.sender;
    }

    /// @notice Gets the contract's native balance using the SELFBALANCE opcode for gas efficiency
    /// @return bal The current balance of the contract in wei
    function selfBalance() private view returns (uint256 bal) {
        assembly {
            bal := selfbalance()
        }
    }

    /// @notice Distributes ERC20 tokens to multiple recipients in a single transaction
    /// @param token The ERC20 token contract to use for the airdrop
    /// @param recipients Array of addresses to receive tokens
    /// @param amounts Array of token amounts corresponding to each recipient
    /// @dev Publicly callable by any user who has approved the contract to spend their tokens.
    ///      Pulls tokens from msg.sender via transferFrom, distributes them, and refunds excess or on failure.
    ///      Skips zero amounts. Frontend must filter invalid addresses.
    function airdrop(IERC20 token, address[] calldata recipients, uint256[] calldata amounts) external nonReentrant {
        uint256 len = recipients.length;
        if (len == 0 || len != amounts.length) revert InvalidInput("Mismatched array lengths");
        if (len >= MAX_RECIPIENTS + 1) revert InvalidInput("Too many recipients");
        if (address(token) == address(0)) revert InvalidInput("Token address cannot be zero");

        uint256 totalAmount;
        unchecked {
            for (uint256 i; i < len; ++i) {
                totalAmount += amounts[i];
            }
        }

        address self = address(this);
        address sender = msg.sender;
        if (!token.transferFrom(sender, self, totalAmount)) {
            revert TransferFailed(sender, totalAmount);
        }
        emit FundsDeposited(sender, totalAmount);

        uint256 transfersCompleted;
        unchecked {
            for (uint256 i; i < len; ++i) {
                if (amounts[i] == 0) continue;
                address recipient = recipients[i];
                if (recipient == address(0)) revert InvalidInput("Recipient address cannot be zero");

                if (!token.transfer(recipient, amounts[i])) {
                    uint256 transferred;
                    for (uint256 j; j < i; ++j) {
                        transferred += amounts[j];
                    }
                    uint256 remaining = totalAmount - transferred;
                    if (remaining != 0) {
                        if (!token.transfer(sender, remaining)) {
                            revert RefundFailed(sender, remaining);
                        }
                    }
                    revert TransferFailed(recipient, amounts[i]);
                }
                transfersCompleted++;
            }
        }

        uint256 excess = token.balanceOf(self);
        if (excess != 0) {
            if (!token.transfer(sender, excess)) {
                revert RefundFailed(sender, excess);
            }
        }

        emit AirdropExecuted(sender, len, totalAmount);
    }

    /// @notice Distributes native Sonic (S) to multiple recipients in a single transaction
    /// @param recipients Array of addresses to receive S
    /// @param amounts Array of S amounts (in wei) corresponding to each recipient
    /// @dev Publicly callable by any user. Sends S via msg.value, distributes them, and refunds excess or on failure.
    ///      Skips zero amounts. Frontend must filter invalid addresses. Recipients must be able to receive S.
    function airdropNative(address[] calldata recipients, uint256[] calldata amounts) external payable nonReentrant {
        uint256 len = recipients.length;
        if (len == 0 || len != amounts.length) revert InvalidInput("Mismatched array lengths");
        if (len >= MAX_RECIPIENTS + 1) revert InvalidInput("Too many recipients");

        uint256 totalAmount;
        unchecked {
            for (uint256 i; i < len; ++i) {
                totalAmount += amounts[i];
            }
        }
        if (msg.value != totalAmount) revert InvalidInput("Incorrect S amount sent");

        address sender = msg.sender;
        emit FundsDeposited(sender, totalAmount);

        uint256 transfersCompleted;
        unchecked {
            for (uint256 i; i < len; ++i) {
                if (amounts[i] == 0) continue;
                address recipient = recipients[i];
                if (recipient == address(0)) revert InvalidInput("Recipient address cannot be zero");

                (bool success, ) = recipient.call{value: amounts[i]}("");
                if (!success) {
                    uint256 transferred;
                    for (uint256 j; j < i; ++j) {
                        transferred += amounts[j];
                    }
                    uint256 remaining = totalAmount - transferred;
                    if (remaining != 0) {
                        (bool refundSuccess, ) = sender.call{value: remaining}("");
                        if (!refundSuccess) {
                            revert RefundFailed(sender, remaining);
                        }
                    }
                    revert TransferFailed(recipient, amounts[i]);
                }
                transfersCompleted++;
            }
        }

        uint256 excess = selfBalance();
        if (excess != 0) {
            (bool success, ) = sender.call{value: excess}("");
            if (!success) {
                revert RefundFailed(sender, excess);
            }
        }

        emit AirdropExecuted(sender, len, totalAmount);
    }

    /// @notice Allows the owner to withdraw ERC20 tokens in emergency situations
    /// @param token The ERC20 token contract to withdraw from
    /// @param amount Amount of tokens to withdraw
    /// @dev Only callable by owner. Typically unused due to automatic refunds.
    function withdrawTokens(IERC20 token, uint256 amount) external payable nonReentrant onlyOwner {
        if (amount == 0) revert InvalidInput("Amount cannot be zero");
        if (address(token) == address(0)) revert InvalidInput("Token address cannot be zero");

        address cachedOwner = owner;
        if (!token.transfer(cachedOwner, amount)) {
            revert TransferFailed(cachedOwner, amount);
        }
        emit EmergencyWithdrawal(cachedOwner, amount);
    }

    /// @notice Allows the owner to withdraw native Sonic (S) in emergency situations
    /// @param amount Amount of S (in wei) to withdraw
    /// @dev Only callable by owner. Typically unused due to automatic refunds.
    function withdrawNative(uint256 amount) external payable nonReentrant onlyOwner {
        if (amount == 0) revert InvalidInput("Amount cannot be zero");
        if (selfBalance() < amount) revert InvalidInput("Insufficient S balance");

        address cachedOwner = owner;
        (bool success, ) = cachedOwner.call{value: amount}("");
        if (!success) {
            revert TransferFailed(cachedOwner, amount);
        }
        emit EmergencyWithdrawal(cachedOwner, amount);
    }

    /// @notice Returns the current ERC20 token balance of the contract
    /// @param token The ERC20 token contract to check
    /// @return The balance of tokens held by the contract
    /// @dev Should be zero post-airdrop due to automatic refunds
    function getContractBalance(IERC20 token) external view returns (uint256) {
        if (address(token) == address(0)) revert InvalidInput("Token address cannot be zero");
        return token.balanceOf(address(this));
    }

    /// @notice Returns the current native Sonic (S) balance of the contract
    /// @return The balance of S (in wei) held by the contract
    /// @dev Should be zero post-airdrop due to automatic refunds
    function getNativeBalance() external view returns (uint256) {
        return selfBalance();
    }
}

{
  "viaIR": true,
  "optimizer": {
    "enabled": true,
    "runs": 1000
  },
  "evmVersion": "paris",
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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