Using a custom authority provider within eosjs for Greymass Fuel

authorityprovider.js

// A custom cosigner AuthorityProvider for EOSJS v2
// This provider overrides the checks on all keys,
// allowing a partially signed transaction to be
// broadcast to the API node.
class CosignAuthorityProvider {
  async getRequiredKeys(args) {
    const { transaction } = args;
    // Iterate over the actions and authorizations
    transaction.actions.forEach((action, ti) => {
      action.authorization.forEach((auth, ai) => {
        // If the authorization matches the expected cosigner
        // then remove it from the transaction while checking
        // for what public keys are required
        if (
          auth.actor === 'greymassfuel'
          && auth.permission === 'cosign'
        ) {
          delete transaction.actions[ti].authorization.splice(ai, 1)
        }
      })
    });
    return convertLegacyPublicKeys((await rpc.fetch('/v1/chain/get_required_keys', {
      transaction,
      available_keys: args.availableKeys,
    })).required_keys);
  }
}

// Pass in new authorityProvider
const api = new Api({
  authorityProvider: new CosignAuthorityProvider(),
  // the rest of your configuration
});

Hi,
I'm using the Anchor mobile app on UNICOVE.
Why am I getting this error?
What is the workaround?

Error: transaction declares authority
'{"actor":"greymassfuel","permission":"cosign"}',
but does not have signatures for it under a provided delay of 0 ms,
provided permissions [],
provided keys ["EOS8gGT...dkGL"],
and a delay max limit of 3888000000 ms

Thanks a lot.

I'm not sure why that would be appearing without more details. If you could shoot an email over to [email protected] and let us know which page you were on and what action you were trying to perform when that error appeared, it'd help us track things down. Thanks!

Thank you for your response.
I will reorganize and send you an email.
Thanks!