# 管理群组关键资产(ArkTS)

以下为管理群组关键资产使用示例，请先查看开发指导：

- [新增关键资产(ArkTS)](asset-js-add.md)
- [删除关键资产(ArkTS)](asset-js-remove.md)
- [更新关键资产(ArkTS)](asset-js-update.md)
- [查询关键资产(ArkTS)](asset-js-query.md)

## 前置条件

在应用配置文件app.json5中，配置群组ID：demo_group_id。

```json
{
  "app": {
    //其他配置项此处省略
    "assetAccessGroups": [
      "demo_group_id"
    ]
  }
}
```

## 新增群组关键资产

在群组中新增一条密码是demo_pwd，别名是demo_alias，附属信息是demo_label的关键资产，该关键资产在用户首次解锁设备后可被访问。

```typescript
import { asset } from '@kit.AssetStoreKit';
import { util } from '@kit.ArkTS';
import { BusinessError } from '@kit.BasicServicesKit';

function stringToArray(str: string): Uint8Array {
  let textEncoder = new util.TextEncoder();
  return textEncoder.encodeInto(str);
}

let attr: asset.AssetMap = new Map();
attr.set(asset.Tag.SECRET, stringToArray('demo_pwd'));
attr.set(asset.Tag.ALIAS, stringToArray('demo_alias'));
attr.set(asset.Tag.ACCESSIBILITY, asset.Accessibility.DEVICE_FIRST_UNLOCKED);
attr.set(asset.Tag.DATA_LABEL_NORMAL_1, stringToArray('demo_label'));
attr.set(asset.Tag.GROUP_ID, stringToArray('demo_group_id'));
try {
  asset.add(attr).then(() => {
    console.info(`Asset added to the group successfully.`);
  }).catch((err: BusinessError) => {
    console.error(`Failed to add Asset to the group. Code is ${err.code}, message is ${err.message}`);
  })
} catch (error) {
  let err = error as BusinessError;
  console.error(`Failed to add Asset to the group. Code is ${err.code}, message is ${err.message}`);
}
```

## 删除群组关键资产

在群组中删除一条别名是demo_alias的关键资产。

```typescript
import { asset } from '@kit.AssetStoreKit';
import { util } from '@kit.ArkTS';
import { BusinessError } from '@kit.BasicServicesKit';

function stringToArray(str: string): Uint8Array {
  let textEncoder = new util.TextEncoder();
  return textEncoder.encodeInto(str);
}

let query: asset.AssetMap = new Map();
query.set(asset.Tag.ALIAS, stringToArray('demo_alias')); // 此处指定别名删除单条群组关键资产，也可不指定别名删除多条群组关键资产
query.set(asset.Tag.GROUP_ID, stringToArray('demo_group_id'));
try {
  asset.remove(query).then(() => {
    console.info(`Asset removed from the group successfully.`);
  }).catch((err: BusinessError) => {
    console.error(`Failed to remove Asset from the group. Code is ${err.code}, message is ${err.message}`);
  });
} catch (error) {
  let err = error as BusinessError;
  console.error(`Failed to remove Asset from the group. Code is ${err.code}, message is ${err.message}`);
}
```

## 更新群组关键资产

在群组中更新别名是demo_alias的关键资产，将关键资产明文更新为demo_pwd_new，附属属性更新成demo_label_new。

```typescript
import { asset } from '@kit.AssetStoreKit';
import { util } from '@kit.ArkTS';
import { BusinessError } from '@kit.BasicServicesKit';

function stringToArray(str: string): Uint8Array {
  let textEncoder = new util.TextEncoder();
  return textEncoder.encodeInto(str);
}

let query: asset.AssetMap = new Map();
query.set(asset.Tag.ALIAS, stringToArray('demo_alias'));
query.set(asset.Tag.GROUP_ID, stringToArray('demo_group_id'));
let attrsToUpdate: asset.AssetMap = new Map();
attrsToUpdate.set(asset.Tag.SECRET, stringToArray('demo_pwd_new'));
attrsToUpdate.set(asset.Tag.DATA_LABEL_NORMAL_1, stringToArray('demo_label_new'));
try {
  asset.update(query, attrsToUpdate).then(() => {
    console.info(`Asset in the group updated successfully.`);
  }).catch((err: BusinessError) => {
    console.error(`Failed to update Asset in the group. Code is ${err.code}, message is ${err.message}`);
  });
} catch (error) {
  let err = error as BusinessError;
  console.error(`Failed to update Asset in the group. Code is ${err.code}, message is ${err.message}`);
}
```

## 查询单条群组关键资产明文

在群组中查询别名是demo_alias的关键资产明文。

```typescript
import { asset } from '@kit.AssetStoreKit';
import { util } from '@kit.ArkTS';
import { BusinessError } from '@kit.BasicServicesKit';

function stringToArray(str: string): Uint8Array {
  let textEncoder = new util.TextEncoder();
  return textEncoder.encodeInto(str);
}

function arrayToString(arr: Uint8Array): string {
  let textDecoder = util.TextDecoder.create("utf-8", { ignoreBOM: true });
  let str = textDecoder.decodeToString(arr, { stream: false })
  return str;
}

let query: asset.AssetMap = new Map();
query.set(asset.Tag.ALIAS, stringToArray('demo_alias')); // 指定了群组关键资产别名，最多查询到一条满足条件的群组关键资产
query.set(asset.Tag.RETURN_TYPE, asset.ReturnType.ALL);  // 此处表示需要返回群组关键资产的所有信息，即属性+明文
query.set(asset.Tag.GROUP_ID, stringToArray('demo_group_id'));
try {
  asset.query(query).then((res: Array<asset.AssetMap>) => {
    for (let i = 0; i < res.length; i++) {
      // parse the secret.
      let secret: Uint8Array = res[i].get(asset.Tag.SECRET) as Uint8Array;
      // parse uint8array to string
      let secretStr: string = arrayToString(secret);
    }
  }).catch ((err: BusinessError) => {
    console.error(`Failed to query Asset. Code is ${err.code}, message is ${err.message}`);
  });
} catch (error) {
  let err = error as BusinessError;
  console.error(`Failed to query Asset. Code is ${err.code}, message is ${err.message}`);
}
```

## 查询单条群组关键资产属性

在群组中查询别名是demo_alias的关键资产属性。

```typescript
import { asset } from '@kit.AssetStoreKit';
import { util } from '@kit.ArkTS';
import { BusinessError } from '@kit.BasicServicesKit';

function stringToArray(str: string): Uint8Array {
  let textEncoder = new util.TextEncoder();
  return textEncoder.encodeInto(str);
}

let query: asset.AssetMap = new Map();
query.set(asset.Tag.ALIAS, stringToArray('demo_alias'));       // 指定了群组关键资产别名，最多查询到一条满足条件的群组关键资产
query.set(asset.Tag.RETURN_TYPE, asset.ReturnType.ATTRIBUTES); // 此处表示仅返回群组关键资产属性，不包含群组关键资产明文
query.set(asset.Tag.GROUP_ID, stringToArray('demo_group_id'));
try {
  asset.query(query).then((res: Array<asset.AssetMap>) => {
    for (let i = 0; i < res.length; i++) {
      // parse the attribute.
      let accessibility: number = res[i].get(asset.Tag.ACCESSIBILITY) as number;
    }
  }).catch ((err: BusinessError) => {
    console.error(`Failed to query Asset from the group. Code is ${err.code}, message is ${err.message}`);
  });
} catch (error) {
  let err = error as BusinessError;
  console.error(`Failed to query Asset from the group. Code is ${err.code}, message is ${err.message}`);
}
```