solana-multiagent/solana-agent-kit/wallet/EmbeddedWallet.js

import { Keypair, Transaction, VersionedTransaction } from "@solana/web3.js"

import bs58 from "bs58"

export class BaseWallet extends Keypair {
  constructor(privateKey) {
    super()
    try {
      const keypair =
        typeof privateKey === "string"
          ? Keypair.fromSecretKey(bs58.decode(privateKey))
          : privateKey

      Object.assign(this, keypair)
    } catch (error) {
      throw new Error(
        `Failed to initialize wallet: ${
          error instanceof Error ? error.message : "Unknown error"
        }`
      )
    }
  }

  async signTransaction(transaction) {
    try {
      if (transaction instanceof Transaction) {
        transaction.partialSign(this)
      } else if (transaction instanceof VersionedTransaction) {
        transaction.sign([this])
      }
      return transaction
    } catch (error) {
      throw new Error(
        `Failed to sign transaction: ${
          error instanceof Error ? error.message : "Unknown error"
        }`
      )
    }
  }

  async signAllTransactions(transactions) {
    try {
      return transactions.map(tx => {
        if (tx instanceof Transaction) {
          tx.partialSign(this)
        } else if (tx instanceof VersionedTransaction) {
          tx.sign([this])
        }
        return tx
      })
    } catch (error) {
      throw new Error(
        `Failed to sign transactions: ${
          error instanceof Error ? error.message : "Unknown error"
        }`
      )
    }
  }
}