Stellar-AutoAction-sdk

Provides a sign transaction function for users to replace the sign function of the steller SDK.

Install

npm install @57block/stellar-autoaction-sdk

Usage

The following example demonstrates signing a transaction using the stellar autoaction-sdk on the Stellar blockchain.

const {
  Horizon,
  Networks,
  Asset,
  Operation,
  TransactionBuilder,
  Keypair,
  xdr,
} = require("@stellar/stellar-sdk");
const { sign } = require("@57block/stellar-autoaction-sdk");

const submitTx = async (
  sourcePublicKey,
  destinationPublicKey,
  account,
  org
) => {
  // Configure the server to the Horizon instance hosted by Stellar.org
  // To use the live network, set the hostname to 'horizon.stellar.org'
  const server = new Horizon.Server('https://horizon-testnet.stellar.org');

  console.log("Building transaction...");
  // Transactions require a valid sequence number that is specific to this account.
  // We can fetch the current sequence number for the source account from Horizon.
  const sourceAccount = await server.loadAccount(sourcePublicKey);
  // Right now, there's one function that fetches the base fee.
  const fee = await server.fetchBaseFee();
  const tx = new TransactionBuilder(sourceAccount, {
    fee,
    // Uncomment the following line to build transactions for the live network. Be
    // sure to also change the horizon hostname.
    // networkPassphrase: StellarSdk.Networks.PUBLIC,
    networkPassphrase: Networks.TESTNET
  })
  // Add a payment operation to the transaction
  .addOperation(Operation.payment({
    destination: destinationPublicKey,
    // The term native asset refers to lumens
    asset: Asset.native(),
    amount: '10',
  }))
  // Make this transaction valid for the next 30 seconds only
  .setTimeout(30)
  // Uncomment to add a memo (https://developers.stellar.org/docs/glossary/transactions/)
  // .addMemo(Memo.text('Hello world!'))
  .build();

  console.log("Signing transaction...");
  // get the signature from sdk sign server
  const signature = await sign({
    txHash: tx.hash().toString('base64'),
    sourcePublicKey,
    account,
    org,
  });
  // use the signature to sign the transaction
  tx.addDecoratedSignature(
    new xdr.DecoratedSignature({
      signature,
      hint: Keypair.fromPublicKey(sourcePublicKey).signatureHint(),
    })
  );
  console.log("Submiting transaction...");
  // Submit the transaction to the Horizon server. The Horizon server will then
  // submit the transaction into the network for us.
  const transactionResult = await server.submitTransaction(tx);
  console.log(`Transaction successful! Tx hash: ${transactionResult.hash}`);
};