# Ability Access Control

> ![icon-note.gif](public_sys-resources/icon-note.gif) **NOTE**
> The initial APIs of this module are supported since API version 8. Newly added APIs will be marked with a superscript to indicate their earliest API version.

## Modules to Import

```
import abilityAccessCtrl from '@ohos.abilityAccessCtrl'
```

## abilityAccessCtrl.createAtManager

createAtManager(): AtManager

Creates an **AtManager** instance, which is used for ability access control.

**System capability**: SystemCapability.Security.AccessToken


**Return value**

| Type| Description|
| -------- | -------- |
| [AtManager](#atmanager) | **AtManager** instance obtained.|

**Example**

```
var AtManager = abilityAccessCtrl.createAtManager();
```

## AtManager

Implements ability access control.

### verifyAccessToken

verifyAccessToken(tokenID: number, permissionName: string): Promise<GrantStatus>

Checks whether an application has been granted the specified permission. This API uses a promise to return the result.

**System capability**: SystemCapability.Security.AccessToken

**Parameters**

| Name  | Type                | Mandatory| Description                                      |
| -------- | -------------------  | ---- | ------------------------------------------ |
| tokenID   |  number   | Yes  | ID of the application.             |
| permissionName | string | Yes  | Name of the permission to verify.|

**Return value**

| Type         | Description                               |
| :------------ | :---------------------------------- |
| Promise<GrantStatus> | Promise instance used to return the result.|

**Example**

```
var AtManager = abilityAccessCtrl.createAtManager();
let tokenID = 0;
let promise = AtManager.verifyAccessToken(tokenID, "ohos.permission.GRANT_SENSITIVE_PERMISSIONS");
promise.then(data => {
    console.log(`promise: data->${JSON.stringify(data)}`);
});
```

### grantUserGrantedPermission

grantUserGrantedPermission(tokenID: number, permissionName: string, permissionFlag: number): Promise<number>

Grants a user granted permission to an application. This API uses a promise to return the result.

**Required permissions**: ohos.permission.GRANT_SENSITIVE_PERMISSIONS

**System capability**: SystemCapability.Security.AccessToken

**Parameters**

| Name   | Type               | Mandatory| Description                                                        |
| --------- | ------------------- | ---- | ------------------------------------------------------------ |
| tokenID      | number              | Yes  | ID of the application.           |
| permissionName | string              | Yes  | Name of the permission to grant.|
| permissionFlag  | number | Yes  | Permission flag. The value **1** means that a dialog box will still be displayed after the user grants or denies the permission. The value **2** means that no dialog box will be displayed after the user grants or denies the permission. The value **3** means a system permission that cannot be changed. |

**Return value**

| Type         | Description                               |
| :------------ | :---------------------------------- |
| Promise<number> | Promise instance used to return the result.|

**Example**

```
var AtManager = abilityAccessCtrl.createAtManager();
let tokenID = 0;
let promise = AtManager.grantUserGrantedPermission(tokenID, "ohos.permission.GRANT_SENSITIVE_PERMISSIONS");
promise.then(data => {
    console.log(`promise: data->${JSON.stringify(data)}`);
});
```



### grantUserGrantedPermission

grantUserGrantedPermission(tokenID: number, permissionName: string, permissionFlag: number, callback: AsyncCallback<number>): void

Grants a user granted permission to an application. This API uses an asynchronous callback to return the result.

**Required permissions**: ohos.permission.GRANT_SENSITIVE_PERMISSIONS

**System capability**: SystemCapability.Security.AccessToken

**Parameters**

| Name   | Type               | Mandatory| Description                         |
| --------- | ------------------- | ---- | ------------------------------------------------------------ |
| tokenID      | number              | Yes  | ID of the application.          |
| permissionName | string              | Yes  | Name of the permission to grant.|
| permissionFlag  | number | Yes  | Permission flag. The value **1** means that a dialog box will still be displayed after the user grants or denies the permission. The value **2** means that no dialog box will be displayed after the user grants or denies the permission. The value **3** means a system permission that cannot be changed. |
| callback | AsyncCallback<number> | Yes| Callback used to return the result.|

**Example**

```
var AtManager = abilityAccessCtrl.createAtManager();
let tokenID = 0;
let permissionFlag = 1;
AtManager.grantUserGrantedPermission(tokenID, "ohos.permission.GRANT_SENSITIVE_PERMISSIONS",permissionFlag, data => {
    console.log(`callback: data->${JSON.stringify(data)}`);
});
```

### revokeUserGrantedPermission

revokeUserGrantedPermission(tokenID: number, permissionName: string, permissionFlag: number): Promise<number>

Revokes a user granted permission given to an application. This API uses a promise to return the result.

**Required permissions**: ohos.permission.REVOKE_SENSITIVE_PERMISSIONS

**System capability**: SystemCapability.Security.AccessToken

**Parameters**

| Name   | Type               | Mandatory| Description                                                        |
| --------- | ------------------- | ---- | ------------------------------------------------------------ |
| tokenID      | number              | Yes  | ID of the application.           |
| permissionName | string              | Yes  | Name of the permission to revoke.|
| permissionFlag  | number | Yes  | Permission flag. The value **1** means that a dialog box will still be displayed after the user grants or denies the permission. The value **2** means that no dialog box will be displayed after the user grants or denies the permission. The value **3** means a system permission that cannot be changed. |

**Return value**

| Type         | Description                               |
| :------------ | :---------------------------------- |
| Promise<number> | Promise instance used to return the result.|

**Example**

```
var AtManager = abilityAccessCtrl.createAtManager();
let tokenID = 0;
let permissionFlag = 1;
let promise = AtManager.revokeUserGrantedPermission(tokenID, "ohos.permission.GRANT_SENSITIVE_PERMISSIONS", permissionFlag);
promise.then(data => {
    console.log(`promise: data->${JSON.stringify(data)}`);
});
```

### revokeUserGrantedPermission

revokeUserGrantedPermission(tokenID: number, permissionName: string, permissionFlag: number, callback: AsyncCallback<number>): void

Revokes a user granted permission given to an application. This API uses an asynchronous callback to return the result.

**Required permissions**: ohos.permission.REVOKE_SENSITIVE_PERMISSIONS

**System capability**: SystemCapability.Security.AccessToken

**Parameters**

| Name   | Type               | Mandatory| Description                         |
| --------- | ------------------- | ---- | ------------------------------------------------------------ |
| tokenID      | number              | Yes  | ID of the application.           |
| permissionName | string              | Yes  | Name of the permission to revoke.|
| permissionFlag  | number | Yes  | Permission flag. The value **1** means that a dialog box will still be displayed after the user grants or denies the permission. The value **2** means that no dialog box will be displayed after the user grants or denies the permission. The value **3** means a system permission that cannot be changed. |
| callback | AsyncCallback<number> | Yes| Callback used to return the result.|

**Example**

```
var AtManager = abilityAccessCtrl.createAtManager();
let tokenID = 0;
AtManager.revokeUserGrantedPermission(tokenID, "ohos.permission.GRANT_SENSITIVE_PERMISSIONS",permissionFlag, data => {
    console.log(`callback: data->${JSON.stringify(data)}`);
});
```

### getPermissionFlags

getPermissionFlags(tokenID: number, permissionName: string): Promise<number>

Obtains the flags of the specified permission of a given application. This API uses a promise to return the result.

**System capability**: SystemCapability.Security.AccessToken

**Parameters**

| Name   | Type               | Mandatory| Description                         |
| --------- | ------------------- | ---- | ------------------------------------------------------------ |
| tokenID      | number              | Yes  | ID of the application.           |
| permissionName | string              | Yes  | Name of the permission to query.|

**Return value**

| Type         | Description                               |
| :------------ | :---------------------------------- |
| Promise<number> | Promise instance used to return the result.|

**Example**

```
var AtManager = abilityAccessCtrl.createAtManager();
let tokenID = 0;
let promise = AtManager.getPermissionFlags(tokenID, "ohos.permission.GRANT_SENSITIVE_PERMISSIONS");
promise.then(data => {
    console.log(`promise: data->${JSON.stringify(data)}`);
});
```

### GrantStatus

Enumerates the permission grant states.

**System capability:** SystemCapability.Security.AccessToken

| Name                         | Default Value                 | Description                   |
| ----------------------------- | ---------------------- | -----------------------  |
| PERMISSION_DENIED             | -1                     | Permission denied.            |
| PERMISSION_GRANTED            | 0                      | Permission granted.            |