EOSCommunity.org Forums

Cosigning transaction

EOSIO Development
#1

Trying to implement this cosigning flow

My cosignTransaction() function sends transaction body to the backend and gets back modified transaction with prepended noop action and a valid signature for the new transaction signed by resource provider.

Here’s the snippet:

async function handleAnchor(actions: Action[]) {
  const session = await anchor.login();
  if (!session) return "";

  const [ info, abis ] = await Promise.all([
    session.client.v1.chain.get_info(),
    session.client.v1.chain.get_abi(actions[0].account)
  ]);
  const header = info.getTransactionHeader(300)
  const trx = Transaction.from({
    ...header,
    actions
  }, abis.abi);

  const { transaction, signatures } = await cosignTransaction( trx, session.auth );

  const signedTransaction = SignedTransaction.from({
      ...transaction,
      signatures,
  })

  const result = await session.transact({ transaction: signedTransaction});

  return result.transaction.id;
}

But looks like session.transact() ignores supplied signature.

So after signing it in Anchor I get this error (note that the only signature here is the one I signed in Anchor):

transaction declares authority '{"actor":"<resourceacc>","permission":"noop"}', but does not have signatures for it under a provided delay of 0 ms, provided permissions [], provided keys ["EOS4w768L97otYaqNcoippcMVKAPwmj2dVZaog7eLLDFsZQteRHCu"], and a delay max limit of 3888000000 ms

Am I doing it wrong?

#2

You’ll need to merge the signatures together, the one from the cosigner and the one from the wallet.

Here’s the section from an example I wrote a while back:

The transact call doesn’t broadcast by default, so it’ll return the signature to you for you to merge and then broadcast manually.

#3

That was it. Got it to work. Thanks for the quick reply!

#4

One more related question.
Is there a way to suppress this “Success!” message when signing a transaction without broadcasting?

image

#5

In the browser transport options, there’s a way to suppress the status at the end.

const transport = new AnchorLinkBrowserTransport({
    /** Whether to display request success and error messages, defaults to true */
    requestStatus: false,
})
const link = new AnchorLink({transport})
#6

Thanks, that worked.