sol-mem-gen/src/utils/extractTxInfo.ts

import { TOKEN_PROGRAM_ID } from "@solana/spl-token";
import { Connection } from "@solana/web3.js";

const connection = new Connection(process.env.NEXT_PUBLIC_SOLANA_RPC_URL!);

export async function extractTxInfo(transactionSignature: string) {
    const result = await connection.getParsedTransaction(transactionSignature, 'confirmed');
    if (!result) {
      throw new Error('Transaction not found');
    }

    const transferInstruction = result.transaction.message.instructions.find(
      (instr) => 'parsed' in instr && instr.programId.equals(TOKEN_PROGRAM_ID)
    );

    if (!transferInstruction || !('parsed' in transferInstruction)) {
      throw new Error('Transfer instruction not found');
    }

    const { info: { amount, authority } } = transferInstruction.parsed;
    return { authority, amount };
  }