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// generate-required-parameters.js --> Filename

const {

ID_REGISTRY_ADDRESS,

ViemLocalEip712Signer,

idRegistryABI,

} = require('@farcaster/hub-nodejs');

const { bytesToHex, createPublicClient, http } = require('viem');

const { mnemonicToAccount } = require('viem/accounts');

const { optimism } = require('viem/chains');

const publicClient = createPublicClient({

chain: optimism,

transport: http(),

});

const FID = 'FID_TO_COLLECT_SIGNATURE_FOR'; // fid returned from GET - /v2/farcaster/user/fid

const MNEMONIC = 'NEW_ACCOUNT_MNEMONIC';

const getDeadline = () => {

const now = Math.floor(Date.now() / 1000);

const oneHour = 60 * 60;

return BigInt(now + oneHour);

};

(async () => {

const deadline = getDeadline();

console.log('\ndeadline: ', parseInt(deadline));

const requestedUserAccount = mnemonicToAccount(MNEMONIC);

const requestedUserAccountSigner = new ViemLocalEip712Signer(

requestedUserAccount

);

console.log(

'\nrequested_user_custody_address: ',

requestedUserAccount.address

);

let requestedUserNonce = await publicClient.readContract({

address: ID_REGISTRY_ADDRESS,

abi: idRegistryABI,

functionName: 'nonces',

args: [requestedUserAccount.address],

});

console.log('\nfid: ', parseInt(FID));

let requestedUserSignature = await requestedUserAccountSigner.signTransfer({

fid: BigInt(FID),

to: requestedUserAccount.address,

nonce: requestedUserNonce,

deadline,

});

console.log(

'\nsignature: ',

bytesToHex(requestedUserSignature.value),

'\n'

);

})();