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coffee-nft

Cofee-NFT project

Use the app

  1. Have a preprod wallet with at least 50 ada.
  2. Go to https://coffee-dao.web.app/ (we're making some changes, minting on preprod is paused)
  3. Click the "BUY NOW"
  4. Enter real or fake info *ZIP CODE needs to be an int
  5. Click the "Submit" button (frontend/cdao/lib/screens/orderFormScreen.dart)
  • This is where the app calls the lucidFunc service worker frontend/cdao/web/lucidFunc.js to build the transaction via the _submitOrderForm() in orderFormScreen.dart.
  • The service worker expects the NFT id as a parameter.
  • The service worker initiates the wallet and asks the user for access to the wallet.
  • It then constructs the transaction with metadata and asks the user to partially sign it.
  • It then passes the tx and witness back to the Dart/Flutter Future _submitOrderForm() that called it.
  • The Future _submitOrderForm() then calls the backend to finish the transaction.
  1. After a few seconds you will be taken to the receipt page where you will see the tx hash, the image of your nft with watermark, and a link to cardanoscan showing your transaction.

Contract

The minting policy is written with Aiken and checks that the mint happens before the deadline, is paid for, has permission from the app, and is minting a single NFT.

Frontend

The frontend is written in Dart/Flutter using a dart/js interop service worker to use the Lucid js package. The main ui pages are found at frontend/cdao/lib/screens and widgets. The lucid service worker can be found at frontend/cdao/web/lucidFunc.js

-Refinements needed:

  • Incorperate app check for firebase assets security.
  • Better error handling and error communication
  • Ability to choose a different NFT
  • Ability to purchase more than one
  • NFT gallery and showing the real NFT on the receipt page.
  • Scaled to handle many types of coffee and NFTs.
  • Obfuscate the lucidFunc
  • Order Form Field Validators
  • Localization

Backend

The server runs on Google Cloud Products Cloud in a Cloud Run Container. It is built with a denoland/deno:latest Dockerfile stored in a private GCP docker repository(Artifact Registry). Cloud Run is only up when there is a request and you are only charged for uptime.

The end point expects a tx and a witness. It then generates the contracts DAO singing key from env variable mnemonic phrase. Then partial sign, assemble, and submit. It returns the tx hash to the front end.

The app uses GCP Firebase Cloud Storage for file storage/cdn, Firestore(noSql) for storing orders, and Realtime Database(sql) for NFT details(id,displayUrl, IPFSUrl, availability).

-Refinements needed:

  • Better env security
  • Stricter access
  • Calls to the Database to ensure nft availability
  • Better error handling and logging
  • Better security rules for Firebase services

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