Presale

{{
  "language": "Solidity",
  "sources": {
    "Presale.sol": {
      "content": "// SPDX-License-Identifier: MIT\r
pragma solidity ^0.8.0;\r
\r
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";\r
\r
contract Presale {\r
    IERC20 public token;\r
    address public owner;\r
    uint public rate; // tokens por ETH\r
    uint public totalRaised;\r
    uint public startTime;\r
    uint public endTime;\r
    bool public finalized;\r
\r
    event TokensPurchased(address buyer, uint amount);\r
\r
    constructor(address _token, uint _rate, uint _startTime, uint _endTime) {\r
        token = IERC20(_token);\r
        owner = msg.sender;\r
        rate = _rate;\r
        startTime = _startTime;\r
        endTime = _endTime;\r
        finalized = false;\r
    }\r
\r
    modifier onlyWhileOpen() {\r
        require(block.timestamp >= startTime && block.timestamp <= endTime, "Presale not active");\r
        _;\r
    }\r
\r
    function buyTokens() external payable onlyWhileOpen {\r
        uint tokens = msg.value * rate;\r
        require(token.balanceOf(address(this)) >= tokens, "Not enough tokens");\r
        totalRaised += msg.value;\r
        token.transfer(msg.sender, tokens);\r
        emit TokensPurchased(msg.sender, tokens);\r
    }\r
\r
    function finalize() external {\r
        require(block.timestamp > endTime, "Presale not ended");\r
        require(!finalized, "Already finalized");\r
        payable(owner).transfer(address(this).balance);\r
        finalized = true;\r
    }\r
}\r
"
    },
    "@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);
}
"
    }
  },
  "settings": {
    "optimizer": {
      "enabled": false,
      "runs": 200
    },
    "outputSelection": {
      "*": {
        "*": [
          "evm.bytecode",
          "evm.deployedBytecode",
          "devdoc",
          "userdoc",
          "metadata",
          "abi"
        ]
      }
    },
    "remappings": []
  }
}}