@ohos.security.asset (Asset Store Service) (System API)

The asset store service (ASSET) provides secure storage and management of sensitive data less than 1024 bytes in size, including passwords, app tokens, and other critical data (such as bank card numbers).

NOTE

• The initial APIs of this module are supported since API version 12. Newly added APIs will be marked with a superscript to indicate their earliest API version.
• This topic describes only the system APIs provided by the module. For details about its public APIs, see ohos.security.asset (Asset Store Service).

Modules to Import

import { asset } from '@kit.AssetStoreKit';

asset.addAsUser

addAsUser(userId: number, attributes: AssetMap): Promise<void>

Adds an asset to the specified user space. This API uses a promise to return the result.

To set IS_PERSISTENT, the application must have the ohos.permission.STORE_PERSISTENT_DATA permission.

Required permissions: ohos.permission.INTERACT_ACROSS_LOCAL_ACCOUNTS

System capability: SystemCapability.Security.Asset

Parameters

Return value

Error codes

For details about the error codes, see Asset Store Service Error Codes.

Example

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 userId: number = 100;
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'));
try {
  asset.addAsUser(userId, attr).then(() => {
    console.info(`Asset added to user space successfully.`);
  }).catch((err: BusinessError) => {
    console.error(`Failed to add Asset to user space. Code is ${err.code}, message is ${err.message}`);
  })
} catch (error) {
  let err = error as BusinessError;
  console.error(`Failed to add Asset to user space. Code is ${err.code}, message is ${err.message}`);
}

asset.removeAsUser

removeAsUser(userId: number, query: AssetMap): Promise<void>

Removes one or more assets from the specified user space. This API uses a promise to return the result.

Required permissions: ohos.permission.INTERACT_ACROSS_LOCAL_ACCOUNTS

System capability: SystemCapability.Security.Asset

Parameters

Return value

Error codes

For details about the error codes, see Asset Store Service Error Codes.

Example

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 userId: number = 100;
let query: asset.AssetMap = new Map();
query.set(asset.Tag.ALIAS, stringToArray('demo_alias'));
try {
  asset.removeAsUser(userId, query).then(() => {
    console.info(`Asset removed from user space successfully.`);
  }).catch((err: BusinessError) => {
    console.error(`Failed to remove Asset from user space. Code is ${err.code}, message is ${err.message}`);
  });
} catch (error) {
  let err = error as BusinessError;
  console.error(`Failed to remove Asset from user space. Code is ${err.code}, message is ${err.message}`);
}

asset.updateAsUser

updateAsUser(userId: number, query: AssetMap, attributesToUpdate: AssetMap): Promise<void>

Updates an asset in the specified user space. This API uses a promise to return the result.

Required permissions: ohos.permission.INTERACT_ACROSS_LOCAL_ACCOUNTS

System capability: SystemCapability.Security.Asset

Parameters

Return value

Error codes

For details about the error codes, see Asset Store Service Error Codes.

Example

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 userId: number = 100;
let query: asset.AssetMap = new Map();
query.set(asset.Tag.ALIAS, stringToArray('demo_alias'));
let attrsToUpdate: asset.AssetMap = new Map();
attrsToUpdate.set(asset.Tag.SECRET, stringToArray('demo_pwd_new'));
try {
  asset.updateAsUser(userId, query, attrsToUpdate).then(() => {
    console.info(`Asset updated in user space successfully.`);
  }).catch((err: BusinessError) => {
    console.error(`Failed to update Asset in user space. Code is ${err.code}, message is ${err.message}`);
  });
} catch (error) {
  let err = error as BusinessError;
  console.error(`Failed to update Asset in user space. Code is ${err.code}, message is ${err.message}`);
}

asset.preQueryAsUser

preQueryAsUser(userId: number, query: AssetMap): Promise<Uint8Array>

Performs preprocessing for the asset query in the specified user space. This API is used when user authentication is required for the access to an asset. After the user authentication is successful, call asset.queryAsUser and asset.postQueryAsUser. This API uses a promise to return the result.

Required permissions: ohos.permission.INTERACT_ACROSS_LOCAL_ACCOUNTS

System capability: SystemCapability.Security.Asset

Parameters

Return value

Error codes

For details about the error codes, see Asset Store Service Error Codes.

Example

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 userId: number = 100;
let query: asset.AssetMap = new Map();
query.set(asset.Tag.ALIAS, stringToArray('demo_alias'));
try {
  asset.preQueryAsUser(userId, query).then((challenge: Uint8Array) => {
    console.info(`Succeeded in pre-querying Asset from user space.`);
  }).catch ((err: BusinessError) => {
    console.error(`Failed to pre-query Asset from user space. Code is ${err.code}, message is ${err.message}`);
  });
} catch (error) {
  let err = error as BusinessError;
  console.error(`Failed to pre-query Asset from user space. Code is ${err.code}, message is ${err.message}`);
}

asset.queryAsUser

queryAsUser(userId: number, query: AssetMap): Promise<Array<AssetMap>>

Queries one or more assets in the specified user space. If user authentication is required for the access to the asset, call asset.preQueryAsUser before this API and call asset.postQueryAsUser after this API. For details about the development procedure, see Querying an Asset with User Authentication. This API uses a promise to return the result.

Required permissions: ohos.permission.INTERACT_ACROSS_LOCAL_ACCOUNTS

System capability: SystemCapability.Security.Asset

Parameters

Return value

Error codes

For details about the error codes, see Asset Store Service Error Codes.

Example

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 userId: number = 100;
let query: asset.AssetMap = new Map();
query.set(asset.Tag.ALIAS, stringToArray('demo_alias'));
try {
  asset.queryAsUser(userId, 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;
    }
    console.info(`Succeeded in querying Asset from user space.`);
  }).catch ((err: BusinessError) => {
    console.error(`Failed to query Asset from user space. Code is ${err.code}, message is ${err.message}`);
  });
} catch (error) {
  let err = error as BusinessError;
  console.error(`Failed to query Asset from user space. Code is ${err.code}, message is ${err.message}`);
}

asset.postQueryAsUser

postQueryAsUser(userId: number, handle: AssetMap): Promise<void>

Performs postprocessing for the asset query in the specified user space. This API is used when user authentication is required for the access to the asset. This API must be used with asset.preQueryAsUser together. This API uses a promise to return the result.

Required permissions: ohos.permission.INTERACT_ACROSS_LOCAL_ACCOUNTS

System capability: SystemCapability.Security.Asset

Parameters

Return value

Error codes

For details about the error codes, see Asset Store Service Error Codes.

Example

import { asset } from '@kit.AssetStoreKit';
import { BusinessError } from '@kit.BasicServicesKit';

let userId: number = 100;
let handle: asset.AssetMap = new Map();
// The new Uint8Array(32) is only an example. Pass in the challenge value returned by asset.preQueryAsUser.
handle.set(asset.Tag.AUTH_CHALLENGE, new Uint8Array(32));
try {
  asset.postQueryAsUser(userId, handle).then(() => {
    console.info(`Succeeded in post-querying Asset from user space.`);
  }).catch ((err: BusinessError) => {
    console.error(`Failed to post-query Asset from user space. Code is ${err.code}, message is ${err.message}`);
  });
} catch (error) {
  let err = error as BusinessError;
  console.error(`Failed to post-query Asset from user space. Code is ${err.code}, message is ${err.message}`);
}

你可能感兴趣的鸿蒙文章

harmony 鸿蒙Asset Store Kit (Asset Store Service)

harmony 鸿蒙Asset_Attr

harmony 鸿蒙Asset_Blob

harmony 鸿蒙Asset_Result

harmony 鸿蒙Asset_ResultSet

harmony 鸿蒙AssetApi

harmony 鸿蒙AssetType

harmony 鸿蒙asset_api.h

harmony 鸿蒙asset_type.h

harmony 鸿蒙Asset Store Service Error Code