solana-agent-kit/src/tools/register_domain.ts

import { registerDomainNameV2 } from "@bonfida/spl-name-service";
import { Transaction } from "@solana/web3.js";
import { SolanaAgentKit } from "../index";
import { getAssociatedTokenAddressSync } from "@solana/spl-token";
import { TOKENS } from "../constants";

/**
 * Register a .sol domain name using Bonfida Name Service
 * @param agent SolanaAgentKit instance
 * @param name Domain name to register (without .sol)
 * @param spaceKB Space allocation in KB (max 10KB)
 * @returns Transaction signature
 */
export async function registerDomain(
  agent: SolanaAgentKit,
  name: string,
  spaceKB: number = 1,
): Promise<string> {
  try {
    // Validate space size
    if (spaceKB > 10) {
      throw new Error("Maximum domain size is 10KB");
    }

    // Convert KB to bytes
    const space = spaceKB * 1_000;

    const buyerTokenAccount = await getAssociatedTokenAddressSync(
      agent.wallet_address,
      TOKENS.USDC,
    );

    // Create registration instruction
    const instruction = await registerDomainNameV2(
      agent.connection,
      name,
      space,
      agent.wallet_address,
      buyerTokenAccount,
    );

    // Create and sign transaction
    const transaction = new Transaction().add(...instruction);
    transaction.recentBlockhash = (
      await agent.connection.getLatestBlockhash()
    ).blockhash;
    transaction.feePayer = agent.wallet_address;

    // Sign and send transaction
    const signature = await agent.connection.sendTransaction(transaction, [
      agent.wallet,
    ]);

    return signature;
  } catch (error: any) {
    throw new Error(`Domain registration failed: ${error.message}`);
  }
}