dart_algorand 0.9.2

Algorand SDK in Dart

Dart Algorand SDK

A Dart library for interacting with the Algorand network.

Installation

TBD

Quick start

Here's a simple example you can run without a node.

import 'package:dart_algorand/dart_algorand.dart';

void main () {
  // generate an account
  final account = generate_account();

  print('Private key: ${account.private_key}');
  print('Address: ${account.address}');

  // check if the address is valid
  if (is_valid_address(account.address)) {
    print('The address is valid!');
  }
  else {
    print('The address is invalid.');
  }

}

Node setup

Follow the instructions in Algorand's developer resources to install a node on your computer.

Running example.py

Before running examples/example.dart, start kmd:

$ ./goal kmd start -d [data directory]

Next, create a wallet and an account:

$ ./goal wallet new [wallet name] -d [data directory]

$ ./goal account new -d [data directory] -w [wallet name]

Visit the Algorand dispenser and enter the account address to fund your account.

Next, in examples/example.dart update the const to reflect your params.

You're now ready to run example.dart!

More examples

using the Wallet class

Instead of always having to keep track of handles, IDs, and passwords for wallets, create a Wallet object to manage everything for you.

import 'package:dart_algorand/dart_algorand.dart';

import 'params.dart';

void main() async {
  // create a kmd client
  final kcl = KmdClient(token: kmdToken, url: kmdUrl);

  // create a wallet object
  final wallet = await Wallet.init(
      walletName: existingWalletName,
      walletPassword: existingWalletPassword,
      kmdClient: kcl);

  // get wallet information
  final info = await wallet.info();
  print ('Wallet name: ${info.wallet.name}');

  // create an account
  final address = await wallet.generateKey();
  print('New account: ${address}');

  // delete the account
  await wallet.deleteKey(address);
  print('Account deleted');
}

backing up a wallet with mnemonic

import 'package:dart_algorand/dart_algorand.dart';

import 'params.dart';

void main() async {
  // create a kmd client
  final kcl = KmdClient(token: kmdToken, url: kmdUrl);

  // create a wallet object
  final wallet = await Wallet.init(
      walletName: existingWalletName,
      walletPassword: existingWalletPassword,
      kmdClient: kcl);

  // get the wallet's master derivation key
  final mdk = await wallet.exportMasterDerivationKey();
  print('Master derivation key: ${mdk}');

  // get backup phrase
  final backup = from_master_derivation_key(mdk);
  print('Wallet backup phrase: ${backup}');
}

You can also back up accounts using from_private_key().

recovering a wallet using a backup phrase

import 'package:dart_algorand/dart_algorand.dart';

import 'params.dart';

void main() async {
  // create a kmd client
  final kcl = KmdClient(token: kmdToken, url: kmdUrl);

  // get the master derivation key from the mnemonic
  final backup =
      'such chapter crane ugly uncover fun kitten duty culture giant skirt '
      'reunion pizza pill web monster upon dolphin aunt close marble dune '
      'kangaroo ability merit';
  
  final mdk = to_master_derivation_key(backup);

  // recover the wallet by passing mdk when creating a wallet
  await kcl.createWallet(
      name: 'new_wallet', password: 'pass', masterDerivKey: mdk);
}

You can also recover accounts using to_private_key().

manipulating multisig transactions

import 'package:dart_algorand/dart_algorand.dart';

import 'params.dart';

void main() async {
  // create an algod client
  final acl = AlgodClient(token: algodToken, url: algodUrl);

  // generate three accounts
  final account1 = generate_account();
  final account2 = generate_account();
  final account3 = generate_account();

  // create a multisig account
  final version = 1; // multisig version
  final threshold = 2; //  how many signatures are necessary
  final msig = Multisig(version: version,
      threshold: threshold,
      addresses: [account1.address, account2.address]);

  // get suggested params
  final params = await acl.transactionParams();

  // create transaction
  final txn = PaymentTxn(
    sender: msig.address(),
    fee: params.fee,
    first_valid_round: params.lastRound,
    last_valid_round: params.lastRound + 100,
    genesis_hash: params.genesishashb64,
    receiver: account3.address,
    genesis_id: params.genesisID,
    amt: 10000
  );

  // create a SignedTransaction object
  final mtx = MultisigTransaction(transaction: txn, multisig: msig);

  // sign the transaction
  mtx.sign(account1.private_key);
  mtx.sign(account2.private_key);

  // print encoded transaction
  print(msgpack_encode(mtx));
}

working with NoteField

We can put things in the "note" field of a transaction; here's an example with an auction bid. Note that you can put any bytes you want in the "note" field; you don't have to use the NoteField object.

import 'dart:convert';

import 'package:dart_algorand/dart_algorand.dart';

import 'params.dart';

void main() async {
  // create an algod client
  final acl = AlgodClient(token: algodToken, url: algodUrl);

  final mnemonic =
      'teach chat health avocado broken avocado trick adapt parade '
      'witness damp gift behave harbor maze truth figure below scatter taste '
      'slow sustain aspect absorb nuclear';

  // convert passphrase to secret key
  final sk = to_private_key(mnemonic);
  final address = address_from_private_key(sk);

  // generate three accounts
  final account1 = generate_account();

  // get suggested params
  final params = await acl.transactionParams();

  // create transaction
  final txn = PaymentTxn(
      sender: address,
      fee: params.fee,
      first_valid_round: params.lastRound,
      last_valid_round: params.lastRound + 100,
      genesis_hash: params.genesishashb64,
      receiver: account1.address,
      genesis_id: params.genesisID,
      note: utf8.encode('Some Text'),
      amt: 10000
  );
  
  // sign it
  txn.sign(sk);
}

working with transaction group

import 'package:dart_algorand/dart_algorand.dart';

import 'params.dart';

void main() async {
  // create an algod and kmd client
  final acl = AlgodClient(token: algodToken, url: algodUrl);
  final kcl = KmdClient(token: kmdToken, url: kmdUrl);

  final sender = generate_account();
  final receiver = generate_account();

  // get suggested params
  final params = await acl.transactionParams();

  // create transaction
  final txn1 = PaymentTxn(
      sender: sender.address,
      fee: params.fee,
      first_valid_round: params.lastRound,
      last_valid_round: params.lastRound + 100,
      genesis_hash: params.genesishashb64,
      receiver: receiver.address,
      genesis_id: params.genesisID,
      amt: 10000
  );

  final txn2 = PaymentTxn(
      sender: receiver.address,
      fee: params.fee,
      first_valid_round: params.lastRound,
      last_valid_round: params.lastRound + 100,
      genesis_hash: params.genesishashb64,
      receiver: sender.address,
      genesis_id: params.genesisID,
      amt: 10000
  );

  // get group id and assign it to transactions
  final gid = calculate_group_id([txn1, txn2]);
  txn1.group = gid;
  txn2.group = gid;

  // sign transactions
  final stxn1 = txn1.sign(sender.private_key);
  final stxn2 = txn2.sign(receiver.private_key);

  // send them over network
  // await acl.sendTransactions([stxn1, stxn2]);
}

working with logic sig

Example below creates a LogicSig transaction signed by a program that never approves the transfer.

import 'dart:typed_data';

import 'package:dart_algorand/dart_algorand.dart';

import 'params.dart';

void main() async {
  // create an algod client
  final acl = AlgodClient(token: algodToken, url: algodUrl);

  final program = Uint8List.fromList([0x01, 0x20, 0x01, 0x00, 0x22]);
  final lsig = LogicSig(program: program);
  final sender = lsig.address();

  // generate account
  final account1 = generate_account();

  // get suggested params
  final params = await acl.transactionParams();

  // create transaction
  final txn = PaymentTxn(
      sender: sender,
      fee: params.fee,
      first_valid_round: params.lastRound,
      last_valid_round: params.lastRound + 100,
      genesis_hash: params.genesishashb64,
      receiver: account1.address,
      genesis_id: params.genesisID,
      amt: 10000
  );

  // note, transaction is signed by logic only (no delegation)
  // that means sender address must match to program hash

  final lstx = LogicSigTransaction(transaction: txn, lsig: lsig);
  assert (lstx.verify());

  // send them over the network
  // await acl.sendTransaction(lstx);
}

working with assets

Assets can be managed by sending three types of transactions: AssetConfigTxn, AssetFreezeTxn, and AssetTransferTxn. Shown below are examples of how to use these transactions.

creating an asset

import 'dart:convert';

import 'package:dart_algorand/dart_algorand.dart';
import 'package:dart_algorand/src/asset_config_txn.dart';

void main() async {
  final creator = generate_account();
  final freeze = generate_account();
  final manager = generate_account();
  final clawback = generate_account();
  final reserve = generate_account();

  final feePerByte = 10;
  final firstValidRound = 1000;
  final lastValidRound = 2000;
  final genesisHash = 'SGO1GKSzyE7IEPItTxCByw9x8FmnrCDexi9/cOUJOiI=';

  final total = 100; // how many of this asset there will be
  final assetName = 'assetname';
  final unitName = 'unitname';
  final url = 'website';

  final metadata = AsciiEncoder()
      .convert('fACPO4nRgO55j1ndAK3W6Sgc4APkcyFh'); // should be a 32-byte hash

  final defaultFrozen = false; // whether accounts should be frozen by default

// create the asset creation transaction
  final txn = AssetConfigTxn(
      sender: creator.address,
      fee: feePerByte,
      first_valid_round: firstValidRound,
      last_valid_round: lastValidRound,
      genesis_hash: genesisHash,
      total: total,
      manager: manager.address,
      reserve: reserve.address,
      freeze: freeze.address,
      clawback: clawback.address,
      unit_name: unitName,
      asset_name: assetName,
      url: url,
      metadata_hash: metadata,
      default_frozen: defaultFrozen
  );

// sign the transaction
  final signed_txn = txn.sign(creator.private_key);
}

updating asset configuration

This transaction must be sent from the manager's account.

import 'package:dart_algorand/dart_algorand.dart';
import 'package:dart_algorand/src/asset_config_txn.dart';

void main() async {
  final mnemonic =
      'such chapter crane ugly uncover fun kitten duty culture giant skirt '
      'reunion pizza pill web monster upon dolphin aunt close marble dune '
      'kangaroo ability merit';

  final managerPrivateKey = to_private_key(mnemonic);
  final managerAddress = address_from_private_key(managerPrivateKey);

  final newFreeze = generate_account();
  final newManager = generate_account();
  final newClawback = generate_account();
  final newReserve = generate_account();

  final feePerByte = 10;
  final firstValidRound = 1000;
  final lastValidRound = 2000;
  final genesisHash = 'SGO1GKSzyE7IEPItTxCByw9x8FmnrCDexi9/cOUJOiI=';

  final index = 1234; // identifying index of the asset

  // create the asset config transaction
  final txn = AssetConfigTxn(
    sender: managerAddress,
    fee: feePerByte,
    first_valid_round: firstValidRound,
    last_valid_round: lastValidRound,
    genesis_hash: genesisHash,
    manager: newManager.address,
    reserve: newReserve.address,
    freeze: newFreeze.address,
    clawback: newClawback.address,
    index: index
  );

  // sign the transction
  final signedTxn = txn.sign(managerPrivateKey);
}

destroying an asset

This transaction must be sent from the creator's account.

import 'package:dart_algorand/dart_algorand.dart';
import 'package:dart_algorand/src/asset_config_txn.dart';

void main() async {
  final mnemonic =
      'such chapter crane ugly uncover fun kitten duty culture giant skirt '
      'reunion pizza pill web monster upon dolphin aunt close marble dune '
      'kangaroo ability merit';

  final creatorPrivateKey = to_private_key(mnemonic);
  final creatorAddress = address_from_private_key(creatorPrivateKey);

  final feePerByte = 10;
  final firstValidRound = 1000;
  final lastValidRound = 2000;
  final genesisHash = 'SGO1GKSzyE7IEPItTxCByw9x8FmnrCDexi9/cOUJOiI=';

  final index = 1234; // identifying index of the asset

  // create the asset config transaction
  final txn = AssetConfigTxn(
    sender: creatorAddress,
    fee: feePerByte,
    first_valid_round: firstValidRound,
    last_valid_round: lastValidRound,
    genesis_hash: genesisHash,
    index: index,
    strict_empty_address_check: false
  );

  // sign the transction
  final signedTxn = txn.sign(creatorPrivateKey);
}

freezing or unfreezing an account

This transaction must be sent from the account specified as the freeze manager for the asset.

import 'package:dart_algorand/dart_algorand.dart';
import 'package:dart_algorand/src/asset_config_txn.dart';

void main() async {
  final mnemonic =
      'such chapter crane ugly uncover fun kitten duty culture giant skirt '
      'reunion pizza pill web monster upon dolphin aunt close marble dune '
      'kangaroo ability merit';

  final freezePrivateKey = to_private_key(mnemonic);
  final freezeAddress = address_from_private_key(freezePrivateKey);

  final feePerByte = 10;
  final firstValidRound = 1000;
  final lastValidRound = 2000;
  final genesisHash = 'SGO1GKSzyE7IEPItTxCByw9x8FmnrCDexi9/cOUJOiI=';

  final index = 1234; // identifying index of the asset
  final freezeTarget = generate_account(); // address to be frozen or unfrozen

  // create the asset config transaction
  final txn = AssetFreezeTxn(
    sender: freezeAddress,
    fee: feePerByte,
    first_valid_round: firstValidRound,
    last_valid_round: lastValidRound,
    genesis_hash: genesisHash,
    index: index,
    target: freezeTarget.address,
    new_freeze_state: true,
  );

  // sign the transction
  final signedTxn = txn.sign(freezePrivateKey);
}

sending assets

import 'package:dart_algorand/dart_algorand.dart';

void main() async {
  final mnemonic =
      'such chapter crane ugly uncover fun kitten duty culture giant skirt '
      'reunion pizza pill web monster upon dolphin aunt close marble dune '
      'kangaroo ability merit';

  final senderPrivateKey = to_private_key(mnemonic);
  final senderAddress = address_from_private_key(senderPrivateKey);

  final feePerByte = 10;
  final firstValidRound = 1000;
  final lastValidRound = 2000;
  final genesisHash = 'SGO1GKSzyE7IEPItTxCByw9x8FmnrCDexi9/cOUJOiI=';
  final receiver = generate_account();
  final closeAssetsTo = generate_account();

  final index = 1234; // identifying index of the asset

  // create the asset config transaction
  final txn = AssetTransferTxn(
    sender: senderAddress,
    fee: feePerByte,
    first_valid_round: firstValidRound,
    last_valid_round: lastValidRound,
    genesis_hash: genesisHash,
    index: index,
    receiver: receiver.address,
    amt: 100,
    close_assets_to: closeAssetsTo.address
  );

  // sign the transction
  final signedTxn = txn.sign(senderPrivateKey);
}

accepting assets

import 'package:dart_algorand/dart_algorand.dart';

void main() async {
  final mnemonic =
      'such chapter crane ugly uncover fun kitten duty culture giant skirt '
      'reunion pizza pill web monster upon dolphin aunt close marble dune '
      'kangaroo ability merit';

  final senderPrivateKey = to_private_key(mnemonic);
  final senderAddress = address_from_private_key(senderPrivateKey);

  final feePerByte = 10;
  final firstValidRound = 1000;
  final lastValidRound = 2000;
  final genesisHash = 'SGO1GKSzyE7IEPItTxCByw9x8FmnrCDexi9/cOUJOiI=';
  final index = 1234; // identifying index of the asset

  // create the asset config transaction
  final txn = AssetTransferTxn(
    sender: senderAddress,
    fee: feePerByte,
    first_valid_round: firstValidRound,
    last_valid_round: lastValidRound,
    genesis_hash: genesisHash,
    index: index,
    receiver: senderAddress, // to start accepting assets, set receiver to sender
    amt: 0, // to start accepting assets, set amount to 0
  );

  // sign the transction
  final signedTxn = txn.sign(senderPrivateKey);
}

revoking assets

This transaction must be sent by the asset's clawback manager.

import 'package:dart_algorand/dart_algorand.dart';

void main() async {
  final mnemonic =
      'such chapter crane ugly uncover fun kitten duty culture giant skirt '
      'reunion pizza pill web monster upon dolphin aunt close marble dune '
      'kangaroo ability merit';

  final clawbackPrivateKey = to_private_key(mnemonic);
  final clawbackAddress = address_from_private_key(clawbackPrivateKey);

  final feePerByte = 10;
  final firstValidRound = 1000;
  final lastValidRound = 2000;
  final genesisHash = 'SGO1GKSzyE7IEPItTxCByw9x8FmnrCDexi9/cOUJOiI=';
  final index = 1234; // identifying index of the asset
  final receiver = generate_account(); // where to send the revoked assets
  final targetAddress =
      'WO3QIJ6T4DZHBX5PWJH26JLHFSRT7W7M2DJOULPXDTUS6TUX7ZRIO4KDFY'; // address to revoke assets from.

  // create the asset config transaction
  final txn = AssetTransferTxn(
    sender: clawbackAddress,
    fee: feePerByte,
    first_valid_round: firstValidRound,
    last_valid_round: lastValidRound,
    genesis_hash: genesisHash,
    index: index,
    receiver: receiver.address,
    amt: 100,
    revocation_target: targetAddress,
  );

  // sign the transction
  final signedTxn = txn.sign(clawbackPrivateKey);
}

Documentation

Documentation for the Dart SDK is available at TBD.

License

Dart Algorand SDK is licensed under a MIT license. See the LICENSE file for details.