Be the change you want to see in the world.

Link

About The Project

Raise fund for social work in crypto built on polygon network. Create fundraising campaign, donate MATIC, generate a receipt, and withdraw the amount.

Network

Contract is deployed on Polygon mumbai network

0x6e5bDb0E72597779b968C5Ff16Cc83D6C20C82D7

https://mumbai.polygonscan.com/address/0x6e5bDb0E72597779b968C5Ff16Cc83D6C20C82D7

⚙️Functions:

• create a fundraising campaign
• users can donate in MATIC💰
• beneficiary can withdraw the donated amount💲
• donor can view last donations and generate receipt🧾

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Built With

• Next.js
• Material UI
• Truffle
• Solidity
• IPFS
• cryptocompare

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Installation

Below are instructions to get started:

1. Clone the repo

   git clone https://github.com/ac12644/Crypto-Charity.git

2. Install packages

   yarn

3. Add environment variables, also you will require dedicated subdomain for IPFS from infura

   MNEMONIC_KEY=
   INFURA_API_KEY=
   INFURA_IPFS_ID=
   INFURA_IPFS_SECRET=

4. Run application

   yarn run dev

Specification

Solidity Functions

1. Create new fundraiser

function createFundraiser(
    string memory name,
    string memory image,
    string memory description,
    uint256 goalAmount,
    address payable beneficiary
  ) public {
    Fundraiser fundraiser = new Fundraiser(
      name,
      image,
      description,
      goalAmount,
      beneficiary,
      msg.sender
    );
    _fundraisers.push(fundraiser);
    emit FundraiserCreated(fundraiser, msg.sender);
  }

2. Set new beneficiary

 function setBeneficiary(address payable _beneficiary) public onlyOwner {
    beneficiary = _beneficiary;
  }

3. Return your donations

  function myDonations() public view returns (
      uint256[] memory values,
      uint256[] memory dates
  )

  {
    uint256 count = myDonationsCount();
    values = new uint256[](count);
    dates = new uint256[](count);
    for (uint256 i = 0; i < count; i++) {
        Donation storage donation = _donations[msg.sender][i];
        values[i] = donation.value;
        dates[i] = donation.date;
    }
    return (values, dates);
  }

4. Beneficiary can withdraw amount to beneficiary address defined when creating fundraiser

function withdraw() public onlyOwner {
      uint256 balance = address(this).balance;
      beneficiary.transfer(balance);
      emit Withdraw(balance);
  }

5. Allow users to donate

function donate() public payable {
    Donation memory donation = Donation({
      value: msg.value,
      date: block.timestamp
    });
    _donations[msg.sender].push(donation);
    totalDonations = totalDonations.add(msg.value);
    donationsCount++;

    emit DonationReceived(msg.sender, msg.value);
  }

6. Return list of fundraisers with [limit] one can define number of fundraiser to be fetched

function fundraisers(uint256 limit, uint256 offset)
    public
    view
    returns (Fundraiser[] memory coll)
  {
    require(offset <= fundraisersCount(), 'offset out of bounds');

    uint256 size = fundraisersCount() - offset;
    size = size < limit ? size : limit;
    size = size < maxLimit ? size : maxLimit;
    coll = new Fundraiser[](size);

    for (uint256 i = 0; i < size; i++) {
      coll[i] = _fundraisers[offset + i];
    }

    return coll;
  }

Contributing

Contributions are what make the open source community such an amazing place to learn, inspire, and create. Any contributions you make are greatly appreciated.

If you have a suggestion that would make this better, please fork the repo and create a pull request. You can also simply open an issue with the tag "enhancement". Don't forget to give the project a star! Thanks again!

1. Fork the Project
2. Create your Feature Branch (git checkout -b feature/AmazingFeature)
3. Commit your Changes (git commit -m 'Add some AmazingFeature')
4. Push to the Branch (git push origin feature/AmazingFeature)
5. Open a Pull Request

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License

Distributed under the MIT License. See LICENSE.txt for more information.

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