feat: improve Solana rebroadcasting logic for sending transactions

src/core/Solana/KeypairWalletAdapter.ts

@@ -0,0 +1,100 @@
+import { ed25519 } from '@noble/curves/ed25519'
+import type {
+  SignerWalletAdapter,
+  WalletName,
+} from '@solana/wallet-adapter-base'
+import {
+  BaseSignerWalletAdapter,
+  WalletConfigError,
+  WalletNotConnectedError,
+  WalletReadyState,
+  isVersionedTransaction,
+} from '@solana/wallet-adapter-base'
+import type {
+  Transaction,
+  TransactionVersion,
+  VersionedTransaction,
+} from '@solana/web3.js'
+import { Keypair } from '@solana/web3.js'
+import { decode } from 'bs58'
+
+export const KeypairWalletName =
+  'Keypair Wallet' as WalletName<'Keypair Wallet'>
+
+/**
+ * This keypair wallet adapter is unsafe to use on the frontend and is only included to provide an easy way for applications to test
+ * Wallet Adapter without using a third-party wallet.
+ */
+export class KeypairWalletAdapter
+  extends BaseSignerWalletAdapter
+  implements SignerWalletAdapter
+{
+  name = KeypairWalletName
+  url = 'https://github.com/anza-xyz/wallet-adapter'
+  icon = ''
+  supportedTransactionVersions: ReadonlySet<TransactionVersion> = new Set([
+    'legacy',
+    0,
+  ])
+
+  /**
+   * Storing a keypair locally like this is not safe because any application using this adapter could retrieve the
+   * secret key, and because the keypair will be lost any time the wallet is disconnected or the window is refreshed.
+   */
+  private _keypair: Keypair | undefined
+
+  constructor(privateKey: string) {
+    if (!privateKey) {
+      throw new WalletConfigError()
+    }
+    super()
+    this._keypair = Keypair.fromSecretKey(decode(privateKey))
+  }
+
+  get connecting() {
+    return false
+  }
+
+  get publicKey() {
+    return this._keypair?.publicKey || null
+  }
+
+  get readyState() {
+    return WalletReadyState.Loadable
+  }
+
+  async connect(privateKey?: string): Promise<void> {
+    if (!privateKey) {
+      throw new WalletConfigError()
+    }
+    this._keypair = Keypair.fromSecretKey(decode(privateKey))
+  }
+
+  async disconnect(): Promise<void> {
+    this._keypair = undefined
+  }
+
+  async signTransaction<T extends Transaction | VersionedTransaction>(
+    transaction: T
+  ): Promise<T> {
+    if (!this._keypair) {
+      throw new WalletNotConnectedError()
+    }
+
+    if (isVersionedTransaction(transaction)) {
+      transaction.sign([this._keypair])
+    } else {
+      transaction.partialSign(this._keypair)
+    }
+
+    return transaction
+  }
+
+  async signMessage(message: Uint8Array): Promise<Uint8Array> {
+    if (!this._keypair) {
+      throw new WalletNotConnectedError()
+    }
+
+    return ed25519.sign(message, this._keypair.secretKey.slice(0, 32))
+  }
+}