web3_universal_nft 0.1.1+1

NFT services for Web3 Universal SDK - ERC-721/ERC-1155, metadata, and IPFS support.

dart_web3_nft

A comprehensive NFT management suite for Dart. Easily interact with ERC-721 and ERC-1155 tokens, fetch metadata from decentralized storage, and integrate with marketplaces.

🚀 Features

• Metadata Engine: Multi-source resolution for IPFS, Arweave, and HTTP metadata.
• Image Processing: (Planned) Built-in utilities for handling SVG and responsive NFT media.
• Marketplace Wrappers: Specialized modules for OpenSea, Blur, and LooksRare.
• Ownership Indexing: Efficiently query all tokens owned by a specific address across collections.

Usage Flow

graph TD
    A[Token ID] --> B[Contract Call]
    B --> C[Metadata URI]
    C --> D[IPFS/Cloud Resolver]
    D --> E[Parsed Metadata]
    E --> F[Asset Cache]
    F --> G[UI Display]

🏗️ Architecture

graph TD
    NFT[NFT Contract] --> URI[Token URI]
    URI --> Resolver[Metadata Resolver]
    
    subgraph Storage [Decentralized Content]
        IPFS[IPFS Gateway]
        AR[Arweave]
        Cloud[S3 / Web]
    end
    
    Resolver --> Storage
    Storage --> Traits[Parsed Features & Asset]

📚 Technical Reference

Core Classes

Class	Responsibility
NftClient	High-level client for token metadata and ownership.
NftMetadata	Structured container for name, description, and traits.
Erc721Collection	Specialized wrapper for ERC-721 contract calls.
IpfsGateway	Implementation for content-addressed data fetching.

🛡️ Security Considerations

• Social Engineering: NFT metadata is often user-controlled. Sanitize all text before display to prevent HTML injection or phishing links in traits.
• URI Spoofing: Validate that the tokenURI returned by the contract points to a trusted gateway or the expected CID format.
• Approval Squatting: Be cautious of "Free Mint" sites that ask for setApprovalForAll permissions; always warn users when significant NFT permissions are requested.

💻 Usage

Fetching Metadata for a Token

import 'package:dart_web3_nft/dart_web3_nft.dart';

void main() async {
  final nft = NftClient(publicClient: client);

  // Fetch standardized metadata for a Bored Ape
  final metadata = await nft.getMetadata(
    contract: '0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D',
    tokenId: 1234,
  );

  print('Name: ${metadata.name}');
  print('Image URL: ${metadata.imageUrl}');
  print('Rarity Score: ${metadata.traits['rarity']}');
}

📦 Installation

dependencies:
  dart_web3_nft: ^0.1.0