Smart_Contracts

Solidity, Blockchain, and Smart Contract Course – Beginner to Expert Python Tutorial

// SPDX-License-Identifier: MIT

// Crowd Sourcing Application

pragma solidity >=0.6.6 <0.9.0;

import "@chainlink/contracts/src/v0.6/interfaces/AggregatorV3Interface.sol"; import "@chainlink/contracts/src/v0.6/vendor/SafeMathChainlink.sol";

contract FundMe {

mapping(address => uint256) public addressToAmountFunded;
address[] public funders;
address public owner;


constructor() public {
    owner = msg.sender;
}

function fund() public payable {
    // $50 
    uint256 minimumUSD = 50 * 10 * 18;
    // 1gwei < $50
    require(getConversionRate(msg.value) >= minimumUSD, "You need to spend more ETH!");
    addressToAmountFunded[msg.sender] += msg.value;
    funders.push(msg.sender); 
    // what the ETH -> USD conversion rate
}

function getVersion() public view returns (uint256) {
    AggregatorV3Interface priceFeed = AggregatorV3Interface(0x8A753747A1Fa494EC906cE90E9f37563A8AF630e);
    return priceFeed.version();
}

function getPrice() public view returns (uint256) {
    AggregatorV3Interface priceFeed = AggregatorV3Interface(0x8A753747A1Fa494EC906cE90E9f37563A8AF630e);
    (,int256 answer,,,) = priceFeed.latestRoundData();
    return uint256(answer * 10000000000);
    // 2740.32000000
}
// 10000000000
function getConversionRate(uint256 ethAmount) public view returns (uint256) {
    uint256 ethPrice = getPrice();
    uint256 ethAmountInUsd = (ethPrice * ethAmount) / 1000000000000000000;
    return ethAmountInUsd;
    // 0.000027679289432000
}

modifier onlyOwner {
    require(msg.sender == owner);
    _;
}

function withdraw() payable public {
    // only want the contract admin/owner
    // require msg.sender = owner
    require(msg.sender == owner);
    msg.sender.transfer(address(this).balance);
    for (uint256 funderIndex=0; funderIndex < funders.length; funderIndex++) {
        address funder = funders[funderIndex];
        addressToAmountFunded[funder] = 0;
    }
    funders = new address[](0);
}

}

// Addresses Hashed below: // 0xE3E8ceD67Dd9AC1BeB7D6B18CD058F3c63217f23 // 0x93423b0dBF6c14135DA71Fe0E7DBd8DB0e993d3d // 0xC9D27A79Bc6b6C2dc00a3cbfB3c04a7eBBCFB7c7 // 0x0AADCDc2b7E2a93ce6E0F17279ddB13d2340fc89 // 0xbc73827A347faAe4b73025A944D77703F1C540F2 // 0xfE59B892641C54d0aB5D998583f742B52B8C5ffa // 0xa08A77821ccb968F66B476fF8362A82543D40F3C // 0x5BB402A7fe3493E82954E054dA43E75c66b5e89c // 0x94000c8bD3F282ac6dE62190fc6C4CfeE268880d // 0xA301aD2fEBfe03B2fDba431DC9A3C47A4e5a6003 // 0xA6122d980F6BC20Ea10B9a63E36d5B0d9A8e19c1 // 0x4dd8c28c3CFd8631099210fa3a96e0fB06B8c2eA // 0x6c273622cC84852aaC8E052Bd387d046833B9205