Smart Contract Opt-in to asset

General
,
1

Do stateful smart contracts need to opt into ASAs? I know stateful smart contracts have an address like any other account, so can I send any ASA to it? If so, how does the smart contract opt into the asset?

2

Hi, please refer to this:
Link

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3 
const algosdk = require('..');

const server = 'https://testnet-algorand.api.purestake.io/ps2';
const port = '';
const token = {
  'x-api-key': 'B3SU4KcVKi94Jap2VXkK83xx38bsv95K5UZm2lab', // fill in yours
};

// const bobmnemonic = 'curious duck pet daughter setup pretty surface saddle arm neck side guard alter tree turtle release shoe vivid power solid trim escape snack above page'; // fill in yours
// const bobAccount = algosdk.mnemonicToSecretKey(bobmnemonic);

const client = new algosdk.Algodv2(token, server, port);

(async () => {
  const params = await client.getTransactionParams().do();
  const program = 'int 1';
  const compiledProgram = await client.compile(program).do();
  const programBytes = new Uint8Array(
    Buffer.from(compiledProgram.result, 'base64')
  );
  // Initialize arguments array
  const args = [];
  // Integer parameter
  args.push(algosdk.encodeUint64(123));

  // create a logic signature
  const lsig = algosdk.makeLogicSig(programBytes, args);
  const lsigaddr = lsig.address();
  const assetID = 12400859; // change to your own assetID

  const from = lsigaddr;
  const to = from;
  console.log(from);
  const revocationTarget = undefined;
  const closeRemainderTo = undefined;
  const note = Uint8Array.from(Buffer.from('0'));
  const amount = 0;
  const txn = algosdk.makeAssetTransferTxnWithSuggestedParams(
    from,
    to,
    closeRemainderTo,
    revocationTarget,
    amount,
    note,
    assetID,
    params
  );
  console.log(txn);
  const rawSignedTxn = algosdk.signLogicSigTransactionObject(txn, lsig);
  console.log(rawSignedTxn);
  const tx = await client.sendRawTransaction(rawSignedTxn.blob).do();
  console.log(tx.txId);
})().catch((e) => {
  console.log(e);
});
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