Magic empowers developers to protect their users via an innovative, passwordless authentication flow without the UX compromises that burden traditional OAuth implementations.

Features

This is your passwordless authentication for your iOS or Android-based Flutter app and enables you to interact with Solana

Installation

Add magic_sdk to your pubspec.yaml:

dependencies:
  flutter:
    sdk: flutter
  magic_sdk: ^4.0.0
  magic_ext_solana: ^0.3.0

  # Magic Flutter SDK depends on crypto-please Solana SDK to construct instructions.  
  solana: ^0.26.0

Run the following command to install dependencies

$ dart pub get

Create an SDK Instance

In main.dart, instantiate Magic with your publishable key, and Solana.

void main() {
  runApp(const MyApp());

  Magic.instance = Magic.blockchain("YOUR_PUBLISHABLE_KEY", rpcUrl: "https://api.devnet.solana.com", chain: SupportedBlockchain.solana);
}

Use Stack in the top level and add Magic.instance.relayer to the children of Stack to ensure the best performance

Note: Relayer is required to establish communication between apps and Magic service. Make sure to have it in a stack whenever you need to authenticate or interact with blockchain

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        title: 'Magic Demo',
        home: Stack(children: [
          const LoginPage(),
          Magic.instance.relayer
        ]));
  }
}

Authenticate your first user!

var token = await magic.auth.loginWithEmailOTP(email: textController.text);

After authenticated a new user, now it's time to interact with Solana.

// Create Solana signer
final magic = Magic.instance;
  
// Now send a transaction! 

// Get the authenticated wallet public key
UserMetadata metadata = await magic.user.getMetadata();

// Construct an instruction
Ed25519HDPublicKey solanaWallet = Ed25519HDPublicKey.fromBase58(metadata.publicAddress!);
var instruction = SystemInstruction.transfer(fundingAccount: solanaWallet, recipientAccount: solanaWallet, lamports: 1);

// recentBlockhash
var recentBlockhash = await client.getRecentBlockhash();

// Message of instructions
var message = Message.only(instruction);

// Sign Transaction Remotely using Magic Auth
var transactionSignature = await magic.solana.signTransaction(
    recentBlockhash,
    message,
    instruction.accounts
);

// Create Base64 string from the signature
var signature = await client.sendTransaction(
    transactionSignature.encode()
);

print(signature);

Additional information

For other solana functions please check Dart library for Solana