Donation

{{
  "language": "Solidity",
  "sources": {
    "@openzeppelin/contracts/access/Ownable.sol": {
      "content": "// 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);
    }
}
"
    },
    "@openzeppelin/contracts/token/ERC20/IERC20.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (token/ERC20/IERC20.sol)

pragma solidity >=0.4.16;

/**
 * @dev Interface of the ERC-20 standard as defined in the ERC.
 */
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);
}
"
    },
    "@openzeppelin/contracts/utils/Context.sol": {
      "content": "// 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;
    }
}
"
    },
    "@openzeppelin/contracts/utils/ReentrancyGuard.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (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 EIP-1153 (transient storage) is available on the chain you're deploying at,
 * consider using {ReentrancyGuardTransient} instead.
 *
 * 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;
    }
}
"
    },
    "contracts/Donation.sol": {
      "content": "// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

/**
 * @title Donation
 * @dev A contract for accepting donations in ETH and ERC20 tokens
 */
contract Donation is Ownable, ReentrancyGuard {
    // Events
    event DonationReceived(address indexed donor, uint256 amount, string currency, string message);
    event ERC20DonationReceived(address indexed donor, address indexed token, uint256 amount, string message);
    event FundsWithdrawn(address indexed to, uint256 amount);
    event ERC20Withdrawn(address indexed token, address indexed to, uint256 amount);

    // Donation structure
    struct DonationInfo {
        address donor;
        uint256 amount;
        string currency;
        string message;
        uint256 timestamp;
    }

    // Array to store donation history
    DonationInfo[] public donations;
    
    // Mapping to track total donations per address
    mapping(address => uint256) public donorTotalAmount;
    
    // Mapping to track supported ERC20 tokens
    mapping(address => bool) public supportedTokens;

    /**
     * @dev Constructor to set the initial owner
     */
    constructor() Ownable(msg.sender) {
        // Initialize with no supported tokens
    }

    /**
     * @dev Add a supported ERC20 token
     * @param tokenAddress The address of the ERC20 token
     */
    function addSupportedToken(address tokenAddress) external onlyOwner {
        require(tokenAddress != address(0), "Invalid token address");
        supportedTokens[tokenAddress] = true;
    }

    /**
     * @dev Remove a supported ERC20 token
     * @param tokenAddress The address of the ERC20 token
     */
    function removeSupportedToken(address tokenAddress) external onlyOwner {
        supportedTokens[tokenAddress] = false;
    }

    /**
     * @dev Donate ETH to the contract
     * @param message Optional message from the donor
     */
    function donate(string memory message) external payable nonReentrant {
        require(msg.value > 0, "Donation amount must be greater than 0");
        
        // Update donor's total amount
        donorTotalAmount[msg.sender] += msg.value;
        
        // Create donation record
        DonationInfo memory newDonation = DonationInfo({
            donor: msg.sender,
            amount: msg.value,
            currency: "ETH",
            message: message,
            timestamp: block.timestamp
        });
        
        // Add to donations array
        donations.push(newDonation);
        
        // Emit event
        emit DonationReceived(msg.sender, msg.value, "ETH", message);
    }

    /**
     * @dev Donate ERC20 tokens to the contract
     * @param tokenAddress The address of the ERC20 token
     * @param amount The amount of tokens to donate
     * @param message Optional message from the donor
     */
    function donateERC20(address tokenAddress, uint256 amount, string memory message) external nonReentrant {
        require(amount > 0, "Donation amount must be greater than 0");
        require(supportedTokens[tokenAddress], "Token not supported");
        
        IERC20 token = IERC20(tokenAddress);
        
        // Transfer tokens from sender to contract
        require(token.transferFrom(msg.sender, address(this), amount), "Token transfer failed");
        
        // Create donation record
        DonationInfo memory newDonation = DonationInfo({
            donor: msg.sender,
            amount: amount,
            currency: "ERC20",
            message: message,
            timestamp: block.timestamp
        });
        
        // Add to donations array
        donations.push(newDonation);
        
        // Emit event
        emit ERC20DonationReceived(msg.sender, tokenAddress, amount, message);
    }

    /**
     * @dev Withdraw ETH from the contract (only owner)
     * @param to Address to send the funds to
     * @param amount Amount of ETH to withdraw
     */
    function withdraw(address payable to, uint256 amount) external onlyOwner nonReentrant {
        require(to != address(0), "Invalid address");
        require(amount > 0, "Amount must be greater than 0");
        require(amount <= address(this).balance, "Insufficient balance");
        
        // Transfer ETH to the specified address
        (bool success, ) = to.call{value: amount}("");
        require(success, "Transfer failed");
        
        // Emit event
        emit FundsWithdrawn(to, amount);
    }

    /**
     * @dev Withdraw ERC20 tokens from the contract (only owner)
     * @param tokenAddress The address of the ERC20 token
     * @param to Address to send the tokens to
     * @param amount Amount of tokens to withdraw
     */
    function withdrawERC20(address tokenAddress, address to, uint256 amount) external onlyOwner nonReentrant {
        require(to != address(0), "Invalid address");
        require(amount > 0, "Amount must be greater than 0");
        
        IERC20 token = IERC20(tokenAddress);
        require(token.balanceOf(address(this)) >= amount, "Insufficient token balance");
        
        // Transfer tokens to the specified address
        require(token.transfer(to, amount), "Token transfer failed");
        
        // Emit event
        emit ERC20Withdrawn(tokenAddress, to, amount);
    }

    /**
     * @dev Get the total number of donations
     * @return The number of donations
     */
    function getDonationCount() external view returns (uint256) {
        return donations.length;
    }

    /**
     * @dev Get donations with pagination
     * @param offset Starting index
     * @param limit Maximum number of donations to return
     * @return Array of donation information
     */
    function getDonations(uint256 offset, uint256 limit) external view returns (DonationInfo[] memory) {
        uint256 donationCount = donations.length;
        
        if (offset >= donationCount) {
            return new DonationInfo[](0);
        }
        
        uint256 size = limit;
        if (offset + limit > donationCount) {
            size = donationCount - offset;
        }
        
        DonationInfo[] memory result = new DonationInfo[](size);
        for (uint256 i = 0; i < size; i++) {
            result[i] = donations[offset + i];
        }
        
        return result;
    }

    /**
     * @dev Get contract ETH balance
     * @return The contract's ETH balance
     */
    function getBalance() external view returns (uint256) {
        return address(this).balance;
    }

    /**
     * @dev Get contract ERC20 token balance
     * @param tokenAddress The address of the ERC20 token
     * @return The contract's token balance
     */
    function getTokenBalance(address tokenAddress) external view returns (uint256) {
        return IERC20(tokenAddress).balanceOf(address(this));
    }

    /**
     * @dev Fallback function to accept ETH
     */
    receive() external payable {
        // Create donation record with empty message
        DonationInfo memory newDonation = DonationInfo({
            donor: msg.sender,
            amount: msg.value,
            currency: "ETH",
            message: "",
            timestamp: block.timestamp
        });
        
        // Add to donations array
        donations.push(newDonation);
        
        // Update donor's total amount
        donorTotalAmount[msg.sender] += msg.value;
        
        // Emit event
        emit DonationReceived(msg.sender, msg.value, "ETH", "");
    }
}"
    }
  },
  "settings": {
    "evmVersion": "paris",
    "optimizer": {
      "enabled": false,
      "runs": 200
    },
    "outputSelection": {
      "*": {
        "*": [
          "evm.bytecode",
          "evm.deployedBytecode",
          "devdoc",
          "userdoc",
          "metadata",
          "abi"
        ]
      }
    }
  }
}}