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pragma solidity ^0.8.js
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pragma solidity ^0.8.js
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pragma solidity ^0.8.0;
contract Crowdfunding {
mapping(address => uint256) public balances;
mapping(address => bool) public campaignCreators;
mapping(address => Campaign) public campaigns;
struct Campaign {
address creator;
string name;
uint256 goalAmount;
uint256 totalRaised;
uint256 deadline;
bool closed;
}
event CampaignCreated(address indexed creator, string name, uint256 goalAmount, uint256 deadline);
event Contribution(address indexed contributor, address indexed campaign, uint256 amount);
event CampaignClosed(address indexed campaign, uint256 totalRaised);
modifier onlyCreator(address _campaign) {
require(campaigns[_campaign].creator == msg.sender, "Only campaign creators can perform this action");
_;
}
constructor() {
// Initialize contract
}
function createCampaign(string memory _name, uint256 _goalAmount, uint256 _deadline) external {
require(_deadline > block.timestamp, "Deadline must be in the future");
require(campaigns[msg.sender].creator == address(0), "Campaign already exists for this address");
campaigns[msg.sender] = Campaign(msg.sender, _name, _goalAmount, 0, _deadline, false);
campaignCreators[msg.sender] = true;
emit CampaignCreated(msg.sender, _name, _goalAmount, _deadline);
}
function contribute(address _campaign) external payable {
Campaign storage campaign = campaigns[_campaign];
require(campaign.creator != address(0), "Campaign does not exist");
require(!campaign.closed, "Campaign is closed");
require(block.timestamp < campaign.deadline, "Campaign deadline has passed");
require(msg.value > 0, "Contribution amount must be greater than zero");
campaign.totalRaised += msg.value;
balances[msg.sender] += msg.value;
emit Contribution(msg.sender, _campaign, msg.value);
}
function closeCampaign(address _campaign) external onlyCreator(_campaign) {
Campaign storage campaign = campaigns[_campaign];
require(!campaign.closed, "Campaign is already closed");
campaign.closed = true;
emit CampaignClosed(_campaign, campaign.totalRaised);
}
function withdrawFunds() external {
uint256 amount = balances[msg.sender];
require(amount > 0, "No funds available for withdrawal");
require(address(this).balance >= amount, "Contract balance is insufficient");
balances[msg.sender] = 0;
payable(msg.sender).transfer(amount);
}
receive() external payable {
// Fallback function
}
}