Querying an Asset with User Authentication (ArkTS)

Available APIs

The following table describes the APIs used for querying an asset with user authentication. For more information, see the API reference.

Asynchronous API	Synchronous API	Description
preQuery(query: AssetMap)	preQuerySync(query: AssetMap)	Performs preprocessing.
query(query: AssetMap)	querySync(query: AssetMap)	Queries the asset.
postQuery(handle: AssetMap)	postQuerySync(handle: AssetMap)	Performs postprocessing.

The following table describes the attributes of AssetMap used for querying an asset with user authentication.

NOTE

In the following table, the attributes starting with DATA_LABEL are custom asset attributes reserved for services. These attributes are not encrypted. Therefore, do not put personal data in these attributes.

• preQuery() parameters

Attribute Name (Tag)	Value	Mandatory	Description
ALIAS	Type: Uint8Array Length: 1-256 bytes	No	Asset alias, which uniquely identifies an asset.
ACCESSIBILITY	Type: number Value range: see Accessibility	No	Access control based on the lock screen status.
REQUIRE_PASSWORD_SET	Type: boolean	No	Whether the asset is accessible only when a lock screen password is set.
AUTH_TYPE	Type: number Value range: see AuthType	No	Type of user authentication required for accessing the asset.
AUTH_VALIDITY_PERIOD	Type: number Value range: 1-600 seconds	No	Validity period of the user authentication.
SYNC_TYPE	Type: number Value range: see SyncType	No	Type of sync supported by the asset.
IS_PERSISTENT	Type: boolean	No	Whether to retain the asset when the application is uninstalled.
DATA_LABEL_CRITICAL_1	Type: Uint8Array Length: 1-2048 bytes	No	Asset attribute information customized by the service with integrity protection. NOTE: The data length is 1 to 512 bytes before API version 12.
DATA_LABEL_CRITICAL_2	Type: Uint8Array Length: 1-2048 bytes	No	Asset attribute information customized by the service with integrity protection. NOTE: The data length is 1 to 512 bytes before API version 12.
DATA_LABEL_CRITICAL_3	Type: Uint8Array Length: 1-2048 bytes	No	Asset attribute information customized by the service with integrity protection. NOTE: The data length is 1 to 512 bytes before API version 12.
DATA_LABEL_CRITICAL_4	Type: Uint8Array Length: 1-2048 bytes	No	Asset attribute information customized by the service with integrity protection. NOTE: The data length is 1 to 512 bytes before API version 12.
DATA_LABEL_NORMAL_1	Type: Uint8Array Length: 1-2048 bytes	No	Asset attribute information customized by the service without integrity protection. NOTE: The data length is 1 to 512 bytes before API version 12.
DATA_LABEL_NORMAL_2	Type: Uint8Array Length: 1-2048 bytes	No	Asset attribute information customized by the service without integrity protection. NOTE: The data length is 1 to 512 bytes before API version 12.
DATA_LABEL_NORMAL_3	Type: Uint8Array Length: 1-2048 bytes	No	Asset attribute information customized by the service without integrity protection. NOTE: The data length is 1 to 512 bytes before API version 12.
DATA_LABEL_NORMAL_4	Type: Uint8Array Length: 1-2048 bytes	No	Asset attribute information customized by the service without integrity protection. NOTE: The data length is 1 to 512 bytes before API version 12.
DATA_LABEL_NORMAL_LOCAL_112+	Type: Uint8Array Length: 1-2048 bytes	No	Local attribute information about the asset. The value is assigned by the service without integrity protection and will not be synced.
DATA_LABEL_NORMAL_LOCAL_212+	Type: Uint8Array Length: 1-2048 bytes	No	Local attribute information about the asset. The value is assigned by the service without integrity protection and will not be synced.
DATA_LABEL_NORMAL_LOCAL_312+	Type: Uint8Array Length: 1-2048 bytes	No	Local attribute information about the asset. The value is assigned by the service without integrity protection and will not be synced.
DATA_LABEL_NORMAL_LOCAL_412+	Type: Uint8Array Length: 1-2048 bytes	No	Local attribute information about the asset. The value is assigned by the service without integrity protection and will not be synced.
REQUIRE_ATTR_ENCRYPTED14+	Type: boolean	No	Whether to query the customized asset attribute information that is encrypted. By default, the unencrypted, customized asset attribute information is queried.
GROUP_ID18+	Type: Uint8Array Length: 7-127 bytes	No	Group to which the asset to be queried belongs. By default, this parameter is not specified.

• query() parameters

Attribute Name (Tag)	Value	Mandatory	Description
ALIAS	Type: Uint8Array Length: 1-256 bytes	Yes	Asset alias, which uniquely identifies an asset.
AUTH_CHALLENGE	Type: Uint8Array Length: 32 bytes	Yes	Challenge for the user authentication.
AUTH_TOKEN	Type: Uint8Array Length: 148 bytes	Yes	Authorization token obtained after the user authentication is successful.
RETURN_TYPE	Type: number	Yes	Type of the asset query result to return.
ACCESSIBILITY	Type: number Value range: see Accessibility	No	Access control based on the lock screen status.
REQUIRE_PASSWORD_SET	Type: boolean	No	Whether the asset is accessible only when a lock screen password is set.
AUTH_TYPE	Type: number Value range: see AuthType	No	Type of user authentication required for accessing the asset.
SYNC_TYPE	Type: number Value range: see SyncType	No	Type of sync supported by the asset.
IS_PERSISTENT	Type: boolean	No	Whether to retain the asset when the application is uninstalled.
DATA_LABEL_CRITICAL_1	Type: Uint8Array Length: 1-2048 bytes	No	Asset attribute information customized by the service with integrity protection. NOTE: The data length is 1 to 512 bytes before API version 12.
DATA_LABEL_CRITICAL_2	Type: Uint8Array Length: 1-2048 bytes	No	Asset attribute information customized by the service with integrity protection. NOTE: The data length is 1 to 512 bytes before API version 12.
DATA_LABEL_CRITICAL_3	Type: Uint8Array Length: 1-2048 bytes	No	Asset attribute information customized by the service with integrity protection. NOTE: The data length is 1 to 512 bytes before API version 12.
DATA_LABEL_CRITICAL_4	Type: Uint8Array Length: 1-2048 bytes	No	Asset attribute information customized by the service with integrity protection. NOTE: The data length is 1 to 512 bytes before API version 12.
DATA_LABEL_NORMAL_1	Type: Uint8Array Length: 1-2048 bytes	No	Asset attribute information customized by the service without integrity protection. NOTE: The data length is 1 to 512 bytes before API version 12.
DATA_LABEL_NORMAL_2	Type: Uint8Array Length: 1-2048 bytes	No	Asset attribute information customized by the service without integrity protection. NOTE: The data length is 1 to 512 bytes before API version 12.
DATA_LABEL_NORMAL_3	Type: Uint8Array Length: 1-2048 bytes	No	Asset attribute information customized by the service without integrity protection. NOTE: The data length is 1 to 512 bytes before API version 12.
DATA_LABEL_NORMAL_4	Type: Uint8Array Length: 1-2048 bytes	No	Asset attribute information customized by the service without integrity protection. NOTE: The data length is 1 to 512 bytes before API version 12.
DATA_LABEL_NORMAL_LOCAL_112+	Type: Uint8Array Length: 1-2048 bytes	No	Local attribute information about the asset. The value is assigned by the service without integrity protection and will not be synced.
DATA_LABEL_NORMAL_LOCAL_212+	Type: Uint8Array Length: 1-2048 bytes	No	Local attribute information about the asset. The value is assigned by the service without integrity protection and will not be synced.
DATA_LABEL_NORMAL_LOCAL_312+	Type: Uint8Array Length: 1-2048 bytes	No	Local attribute information about the asset. The value is assigned by the service without integrity protection and will not be synced.
DATA_LABEL_NORMAL_LOCAL_412+	Type: Uint8Array Length: 1-2048 bytes	No	Local attribute information about the asset. The value is assigned by the service without integrity protection and will not be synced.
REQUIRE_ATTR_ENCRYPTED14+	Type: boolean	No	Whether to query the customized asset attribute information that is encrypted. By default, the unencrypted, customized asset attribute information is queried.
GROUP_ID18+	Type: Uint8Array Length: 7-127 bytes	No	Group to which the asset to be queried belongs. By default, this parameter is not specified.

• postQuery() parameters

Attribute Name (Tag)	Value	Mandatory	Description
AUTH_CHALLENGE	Type: Uint8Array Length: 32 bytes	Yes	Challenge for the user authentication.
GROUP_ID18+	Type: Uint8Array Length: 7-127 bytes	No	Group to which the asset to be cleared belongs. By default, the assets that do not belong to any group in the memory are cleared.

Example

NOTE

The asset module provides asynchronous and synchronous APIs. The following uses the asynchronous APIs as an example. For more information about the APIs, see Asset Store Service.

Query asset demo_alias with user authentication.

import { asset } from '@kit.AssetStoreKit';
import { util } from '@kit.ArkTS';
import userAuth from '@ohos.userIAM.userAuth';
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;
}

async function userAuthenticate(challenge: Uint8Array): Promise<Uint8Array> {
  return new Promise((resolve, reject) => {
    const authParam: userAuth.AuthParam = {
      challenge: challenge,
      authType: [userAuth.UserAuthType.PIN],
      authTrustLevel: userAuth.AuthTrustLevel.ATL1,
    };
    const widgetParam: userAuth.WidgetParam = { title:' Enter the lock screen password. '};
    try {
      let userAuthInstance = userAuth.getUserAuthInstance(authParam, widgetParam);
      userAuthInstance.on('result', {
        onResult(result) {
          if (result.result == userAuth.UserAuthResultCode.SUCCESS) {
            console.info(`User identity authentication succeeded.`);
            resolve(result.token);
          } else {
            console.error(`User identity authentication failed.`);
            reject();
          }
        }
      });
      userAuthInstance.start();
    } catch (error) {
      let err = error as BusinessError;
      console.error(`User identity authentication failed. Code is ${err.code}, message is ${err.message}`);
      reject();
    }
  })
}

function preQueryAsset(): Promise<Uint8Array> {
  return new Promise((resolve, reject) => {
    try {
      let query: asset.AssetMap = new Map();
      query.set(asset.Tag.ALIAS, stringToArray('demo_alias'));
      asset.preQuery(query).then((challenge: Uint8Array) => {
        resolve(challenge);
      }).catch(() => {
        reject();
      })
    } catch (error) {
      let err = error as BusinessError;
      console.error(`Failed to pre-query Asset. Code is ${err.code}, message is ${err.message}`);
      reject();
    }
  });
}

async function postQueryAsset(challenge: Uint8Array) {
  let handle: asset.AssetMap = new Map();
  handle.set(asset.Tag.AUTH_CHALLENGE, challenge);
  try {
    await asset.postQuery(handle);
    console.info(`Succeeded in post-querying Asset.`);
  } catch (error) {
    let err = error as BusinessError;
    console.error(`Failed to post-query Asset. Code is ${err.code}, message is ${err.message}`);
  }
}

async function queryAsset() {
  // step1. Call asset.preQuery to obtain the challenge value.
  preQueryAsset().then(async (challenge: Uint8Array) => {
    try {
      // Step 2. Pass in the challenge value to start the user authentication dialog box.
      let authToken: Uint8Array = await userAuthenticate(challenge);
      // Step 3 After the user authentication is successful, pass in the challenge value and authorization token to query the plaintext of the asset.
      let query: asset.AssetMap = new Map();
      query.set(asset.Tag.ALIAS, stringToArray('demo_alias'));
      query.set(asset.Tag.RETURN_TYPE, asset.ReturnType.ALL);
      query.set(asset.Tag.AUTH_CHALLENGE, challenge);
      query.set(asset.Tag.AUTH_TOKEN, authToken);
      let res: Array<asset.AssetMap> = await asset.query(query);
      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);
      }
      // Step 4. After the plaintext is obtained, call asset.postQuery to perform postprocessing.
      postQueryAsset(challenge);
    } catch (error) {
      // Step 5. If the operation after preQuery() fails, call asset.postQuery to perform postprocessing.
      postQueryAsset(challenge);
    }
  }).catch ((err: BusinessError) => {
    console.error(`Failed to pre-query Asset. Code is ${err.code}, message is ${err.message}`);
  })
}

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