Wallet abstraction

[tequdev]

Many of the functions in xrpl.js, including the Client class, rely on the implementation of the Wallet class.

By changing this to rely on the interface for signing, developers will be able to use client.sign() and other functions using any wallet that implements this interface.

• Wallet

interface SignResult {
  tx_blob: string
  hash: string
}

export interface SignableWallet {
  sign: (transaction: Transaction, multisign?: boolean | string) => SignResult
  get address(): string
  ...
}

// Existing wallet class
export class Wallet implements SignableWallet {
  public readonly publicKey: string
  public readonly privateKey: string
  public readonly classicAddress: string
  public readonly seed?: string
  ...
}

• Client

class Client extends EventEmitter<EventTypes> {
...
  public async submit(
    transaction: SubmittableTransaction | string,
    opts?: {
      // If true, autofill a transaction.
      autofill?: boolean
      // If true, and the transaction fails locally, do not retry or relay the transaction to other servers.
      failHard?: boolean
      // A wallet to sign a transaction. It must be provided when submitting an unsigned transaction.
      wallet?: SignableWallet
    },
  ): Promise<SubmitResponse> {
    const signedTx = await getSignedTx(this, transaction, opts)
    return submitRequest(this, signedTx, opts?.failHard)
  }
...
}