solana-program-examples/tokens/compression/cnft-vault/anchor/app/utils.ts

import { Connection, Keypair, PublicKey, Signer, TransactionInstruction, TransactionMessage, VersionedTransaction, AccountMeta } from "@solana/web3.js";

import * as bs58 from "bs58";

export function loadWalletKey(keypairFile: string): Keypair {
  const fs = require("fs")
  return Keypair.fromSecretKey(
    new Uint8Array(JSON.parse(fs.readFileSync(keypairFile).toString())),
  );
}

export function decode(stuff: string) {
  return bufferToArray(bs58.decode(stuff))
}
function bufferToArray(buffer: Buffer): number[] {
  const nums: number[] = [];
  for (let i = 0; i < buffer.length; i++) {
    nums.push(buffer[i]);
  }
  return nums;
}
export const mapProof = (assetProof: { proof: string[] }): AccountMeta[] => {
  if (!assetProof.proof || assetProof.proof.length === 0) {
    throw new Error("Proof is empty");
  }
  return assetProof.proof.map((node) => ({
    pubkey: new PublicKey(node),
    isSigner: false,
    isWritable: false,
  }));
};