---
id: sp-client
sidebar_position: 3
title: 'Storage Provider Client'
---

The api related to storage provider are some troublesome.

## AuthType

SDK support two
[authentication type](https://docs.bnbchain.org/greenfield-docs/docs/api/storage-provider-rest#authentication-type):

- ECDSA: It is usually used on Node.js(Because it need to use a private key)
- EDDSA: It is usually used in a browser

```jsx title="AuthType"
/**
 * ECDSA Signature
 */
export type ECDSA = {
  type: 'ECDSA',
  privateKey: string,
};
/**
 * EDDSA Signature
 */
export type EDDSA = {
  type: 'EDDSA',
  seed: string,
  domain: string,
  address: string,
};
export type AuthType = ECDSA | EDDSA;
```

<!-- ## SpInfo

This is the sp service information you want to use.

## OffchainAuth

If you use SDK in browser, you have to get it manually (because you can't get private key in
browser). -->

## Sp Api Example

`getBucketReadQuota` as example:

```jsx title="browser"
const getAllSps = async () => {
  const sps = await getSps();

  return sps.map((sp) => {
    return {
      address: sp.operatorAddress,
      endpoint: sp.endpoint,
      name: sp.description?.moniker,
    };
  });
};

// generate seed:
const allSps = await getAllSps();
const offchainAuthRes = await client.offchainauth.genOffChainAuthKeyPairAndUpload(
  {
    sps: allSps,
    chainId: GREEN_CHAIN_ID,
    expirationMs: 5 * 24 * 60 * 60 * 1000,
    domain: window.location.origin,
    address: 'your address',
  },
  provider: 'wallet provider',
);

// request sp api
const bucketQuota = await client.bucket.getBucketReadQuota(
  {
    bucketName,
  },
  {
    type: 'EDDSA',
    seed: offchainAuthRes.seedString,
    domain: window.location.origin,
    address: 'your address',
  },
);
```

```jsx title="Nodejs"
// request sp api
const bucketQuota = await client.bucket.getBucketReadQuota(
  {
    bucketName,
  },
  {
    type: 'ECDSA',
    privateKey: '0x....',
  },
);
```