# @ohos.fileshare (File Sharing)

The **fileShare** module provides APIs for granting permissions on a user file to another application based on the file Uniform Resource Identifier (URI). Then, the authorized application can call [@ohos.file.fs](js-apis-file-fs.md) APIs to access the file.

> **NOTE**
>
> The initial APIs of this module are supported since API version 9. Newly added APIs will be marked with a superscript to indicate their earliest API version.

## Modules to Import

```ts
import fileShare from '@ohos.fileshare';
```

## OperationMode<sup>11+</sup>

Enumerates the permissions on a URI.

**System capability**: SystemCapability.FileManagement.AppFileService.FolderAuthorization

| Name | Value  | Description |
| ----- |-----|-----|
| READ_MODE  | 0b1 | Read.|
| WRITE_MODE  | 0b10 | Write.|

## PolicyErrorCode<sup>11+</sup>

Enumerates the error codes for a permission policy.

**System capability**: SystemCapability.FileManagement.AppFileService.FolderAuthorization

| Name | Value  | Description       |
| ----- |-----|-----------|
| PERSISTENCE_FORBIDDEN  | 1   | The permission on the URI cannot be persisted.|
| INVALID_MODE  | 2   | Invalid mode.    |
| INVALID_PATH  | 3   | Invalid path.    |
| PERMISSION_NOT_PERSISTED<sup>12+</sup>  | 4   | The permission is not persisted.|

## PolicyErrorResult<sup>11+</sup>

Represents the detailed permission policy error information, which can be used when **persistPermission**, **revokePermission**, **activatePermission**, or **deactivatePermission** throws an error.

**System capability**: SystemCapability.FileManagement.AppFileService.FolderAuthorization

| Name     | Type                                  | Mandatory| Description               |
|---------|--------------------------------------|-----|-----------------------|
| uri     | string                               | Yes | URI of the file, on which the permission fails to be granted or activated.        |
| code    | [PolicyErrorCode](#policyerrorcode11) | Yes | Error code.|
| message | string                               | Yes  | Cause of the error. |

## PolicyInfo<sup>11+</sup>

Represents a permission policy, that is, a policy for granting or activating the permission on a file.

**System capability**: SystemCapability.FileManagement.AppFileService.FolderAuthorization

| Name           | Type      | Mandatory | Description                                                                                                                                               |
|---------------| ---------|-----|---------------------------------------------------------------------------------------------------------------------------------------------------|
| uri           | string     | Yes  | URI of the file, on which the permission is to be granted or activated.                                                                                                                                   |
| operationMode | number  | Yes  | Permissions on the URI. For details, see [OperationMode](#operationmode11).<br>For example, **fileShare.OperationMode.READ_MODE** indicates the read permission on the file.<br>**fileShare.OperationMode.READ_MODE\|fileShare.OperationMode.WRITE_MODE** indicates the read/write permission.|

## fileShare.persistPermission<sup>11+</sup>

persistPermission(policies: Array&lt;PolicyInfo>): Promise&lt;void&gt;

Persists the permissions granted to multiple files or folders. This API uses a promise to return the result.<br>This API is available only to the devices with the required system capability.

**Required permissions**: ohos.permission.FILE_ACCESS_PERSIST

**System capability**: SystemCapability.FileManagement.AppFileService.FolderAuthorization

**Parameters**

| Name| Type                                   | Mandatory| Description                     |
| -------- |---------------------------------------| -------- |-------------------------|
| policies| Array&lt;[PolicyInfo](#policyinfo11)> | Yes| Array of permission policies. The maximum number of policies is 500.|

**Return value**

| Type| Description|
| -------- | -------- |
| Promise&lt;void&gt; | Promise that returns no value.|

**Error codes**

For details about the error codes, see [File Management Error Codes](errorcode-filemanagement.md).
If the permission persistence of some URIs fails, error code 13900001 will be returned and the **data** field provides error information of these URIs in the Array<[PolicyErrorResult](#policyerrorresult11)> format.

| ID   | Error Message      |
|----------| --------- |
| 201      | Permission verification failed, usually the result returned by VerifyAccessToken.|
| 401      | Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types. |
| 801      | Capability not supported. |
| 13900001 | Operation not permitted.            |
| 13900042 | Unknown error                          |

**Example**

  ```ts
  import { BusinessError } from '@ohos.base';
  import picker from '@ohos.file.picker';
  
  async function persistPermissionExample() {
    try {
      let DocumentSelectOptions = new picker.DocumentSelectOptions();
      let documentPicker = new picker.DocumentViewPicker();
      let uris = await documentPicker.select(DocumentSelectOptions);
      let policyInfo: fileShare.PolicyInfo = {
        uri: uris[0], 
        operationMode: fileShare.OperationMode.READ_MODE,
      };
      let policies: Array<fileShare.PolicyInfo> = [policyInfo];
      fileShare.persistPermission(policies).then(() => {
        console.info("persistPermission successfully");
      }).catch((err: BusinessError<Array<fileShare.PolicyErrorResult>>) => {
        console.error("persistPermission failed with error message: " + err.message + ", error code: " + err.code);
        if (err.code == 13900001 && err.data) {
          for (let i = 0; i < err.data.length; i++) {
            console.error("error code : " + JSON.stringify(err.data[i].code));
            console.error("error uri : " + JSON.stringify(err.data[i].uri));
            console.error("error reason : " + JSON.stringify(err.data[i].message));
          }
        }
      });
    } catch (error) {
      let err: BusinessError = error as BusinessError;
      console.error('persistPermission failed with err: ' + JSON.stringify(err));
    }
  }
  ```

## fileShare.revokePermission<sup>11+</sup>

revokePermission(policies: Array&lt;PolicyInfo&gt;): Promise&lt;void&gt;

Revokes permissions from multiple files or folders. This API uses a promise to return the result.<br>This API is available only to the devices with the required system capability.

**Required permissions**: ohos.permission.FILE_ACCESS_PERSIST

**System capability**: SystemCapability.FileManagement.AppFileService.FolderAuthorization

**Parameters**

| Name| Type                | Mandatory| Description                     |
| -------- |--------------------| -------- |-------------------------|
| policies| Array&lt;[PolicyInfo](#policyinfo11)> | Yes| Array of permission policies. The maximum number of policies is 500.|

**Return value**

| Type| Description|
| -------- | -------- |
| Promise&lt;void&gt; | Promise that returns no value.|

**Error codes**

For details about the error codes, see [File Management Error Codes](errorcode-filemanagement.md).
If the permission revocation of some URIs fails, error code 13900001 will be returned and the **data** field provides error information of these URIs in the Array<[PolicyErrorResult](#policyerrorresult11)> format.

| ID   | Error Message      |
|----------| --------- |
| 201      | Permission verification failed, usually the result returned by VerifyAccessToken.|
| 401      | Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types. |
| 801      | Capability not supported. |
| 13900001 | Operation not permitted.            |
| 13900042 | Unknown error                          |

**Example**

  ```ts
  import { BusinessError } from '@ohos.base';
  import picker from '@ohos.file.picker';
  
  async function revokePermissionExample() {
    try {
      let DocumentSelectOptions = new picker.DocumentSelectOptions();
      let documentPicker = new picker.DocumentViewPicker();
      let uris = await documentPicker.select(DocumentSelectOptions);
      let policyInfo: fileShare.PolicyInfo = {
        uri: uris[0], 
        operationMode: fileShare.OperationMode.READ_MODE,
      };
      let policies: Array<fileShare.PolicyInfo> = [policyInfo];
      fileShare.revokePermission(policies).then(() => {
        console.info("revokePermission successfully");
      }).catch((err: BusinessError<Array<fileShare.PolicyErrorResult>>) => {
        console.error("revokePermission failed with error message: " + err.message + ", error code: " + err.code);
          if (err.code == 13900001 && err.data) {
            for (let i = 0; i < err.data.length; i++) {
              console.error("error code : " + JSON.stringify(err.data[i].code));
              console.error("error uri : " + JSON.stringify(err.data[i].uri));
              console.error("error reason : " + JSON.stringify(err.data[i].message));
            }
          }
      });
    } catch (error) {
      let err: BusinessError = error as BusinessError;
      console.error('revokePermission failed with err: ' + JSON.stringify(err));
    }
  }
  ```

## fileShare.activatePermission<sup>11+</sup>

activatePermission(policies: Array&lt;PolicyInfo>): Promise&lt;void&gt;

Activates the permissions that have been persisted on multiple files or folders. This API uses a promise to return the result.<br>This API is available only to the devices with the required system capability.

**Required permissions**: ohos.permission.FILE_ACCESS_PERSIST

**System capability**: SystemCapability.FileManagement.AppFileService.FolderAuthorization

**Parameters**

| Name| Type| Mandatory| Description                     |
| -------- | -------- | -------- |-------------------------|
| policies| Array&lt;[PolicyInfo](#policyinfo11)> | Yes| Array of permission policies. The maximum number of policies is 500.|

**Return value**

| Type| Description|
| -------- | -------- |
| Promise&lt;void&gt; | Promise that returns no value.|

**Error codes**

For details about the error codes, see [File Management Error Codes](errorcode-filemanagement.md).
If the permission activation of some URIs fails, error code 13900001 will be returned and the **data** field provides error information of these URIs in the Array<[PolicyErrorResult](#policyerrorresult11)> format.

| ID   | Error Message      |
|----------| --------- |
| 201      | Permission verification failed, usually the result returned by VerifyAccessToken.|
| 401      | Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types. |
| 801      | Capability not supported. |
| 13900001 | Operation not permitted.            |
| 13900042 | Unknown error                          |

**Example**

  ```ts
  import { BusinessError } from '@ohos.base';
  import picker from '@ohos.file.picker';
  
  async function activatePermissionExample() {
    try {
      let uri = "file://docs/storage/Users/username/tmp.txt";
      let policyInfo: fileShare.PolicyInfo = {
        uri: uri,
        operationMode: fileShare.OperationMode.READ_MODE,
      };
      let policies: Array<fileShare.PolicyInfo> = [policyInfo];
      fileShare.activatePermission(policies).then(() => {
        console.info("activatePermission successfully");
      }).catch(async (err: BusinessError<Array<fileShare.PolicyErrorResult>>) => {
        console.error("activatePermission failed with error message: " + err.message + ", error code: " + err.code);
          if (err.code == 13900001 && err.data) {
            for (let i = 0; i < err.data.length; i++) {
              console.error("error code : " + JSON.stringify(err.data[i].code));
              console.error("error uri : " + JSON.stringify(err.data[i].uri));
              console.error("error reason : " + JSON.stringify(err.data[i].message));
              if(err.data[i].code == fileShare.PolicyErrorCode.PERMISSION_NOT_PERSISTED){
                await fileShare.persistPermission(policies);
              }
            }
          }
      });
    } catch (error) {
      let err: BusinessError = error as BusinessError;
      console.error('activatePermission failed with err: ' + JSON.stringify(err));
    }
  }
  ```

## fileShare.deactivatePermission<sup>11+</sup>

deactivatePermission(policies: Array&lt;PolicyInfo>): Promise&lt;void&gt;

Deactivates the permissions on multiple files or folders. This API uses a promise to return the result. <br>This API is available only to the devices that have the required system capability.

**Required permissions**: ohos.permission.FILE_ACCESS_PERSIST

**System capability**: SystemCapability.FileManagement.AppFileService.FolderAuthorization

**Parameters**

| Name| Type| Mandatory| Description                     |
| -------- | -------- | -------- |-------------------------|
| policies| Array&lt;[PolicyInfo](#policyinfo11)> | Yes| Array of permission policies. The maximum number of policies is 500.|

**Return value**

| Type| Description|
| -------- | -------- |
| Promise&lt;void&gt; | Promise that returns no value.|

**Error codes**

For details about the error codes, see [File Management Error Codes](errorcode-filemanagement.md).
If the permission deactivation of some URIs fails, error code 13900001 will be returned and the **data** field provides error information of these URIs in the Array<[PolicyErrorResult](#policyerrorresult11)> format.

| ID   | Error Message      |
|----------| --------- |
| 201      | Permission verification failed, usually the result returned by VerifyAccessToken.|
| 401      | Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types. |
| 801      | Capability not supported. |
| 13900001 | Operation not permitted.            |
| 13900042 | Unknown error                          |

**Example**

  ```ts
  import { BusinessError } from '@ohos.base';
  import picker from '@ohos.file.picker';
  
  async function deactivatePermissionExample() {
    try {
      let uri = "file://docs/storage/Users/username/tmp.txt";
      let policyInfo: fileShare.PolicyInfo = {
        uri: uri,
        operationMode: fileShare.OperationMode.READ_MODE,
      };
      let policies: Array<fileShare.PolicyInfo> = [policyInfo];
      fileShare.deactivatePermission(policies).then(() => {
        console.info("deactivatePermission successfully");
      }).catch((err: BusinessError<Array<fileShare.PolicyErrorResult>>) => {
        console.error("deactivatePermission failed with error message: " + err.message + ", error code: " + err.code);
          if (err.code == 13900001 && err.data) {
            for (let i = 0; i < err.data.length; i++) {
              console.error("error code : " + JSON.stringify(err.data[i].code));
              console.error("error uri : " + JSON.stringify(err.data[i].uri));
              console.error("error reason : " + JSON.stringify(err.data[i].message));
            }
          }
      });
    } catch (error) {
      let err: BusinessError = error as BusinessError;
      console.error('deactivatePermission failed with err: ' + JSON.stringify(err));
    }
  }
  ```

## fileShare.checkPersistentPermission<sup>12+</sup>

checkPersistentPermission(policies: Array&lt;PolicyInfo>): Promise&lt;Array&lt;boolean&gt;&gt;

Checks persistent permissions. This API uses a promise to return the result.

**Required permissions**: ohos.permission.FILE_ACCESS_PERSIST

**System capability**: SystemCapability.FileManagement.AppFileService.FolderAuthorization

**Parameters**

| Name| Type                                   | Mandatory| Description                     |
| -------- |---------------------------------------| -------- |-------------------------|
| policies| Array&lt;[PolicyInfo](#policyinfo11)> | Yes| Array of permission policies. The maximum number of policies is 500.|

**Return value**

|              Type                  |               Description                   |
| ----------------------------------- | ------------------------------------- |
| Promise&lt;Array&lt;boolean&gt;&gt; | Promise used to return the result. The value **true** means the permission on the file or folder is persistent; the value **false** means the opposite.|

**Error codes**

For details about the error codes, see [File Management Error Codes](errorcode-filemanagement.md).

| ID   | Error Message      |
|----------| --------- |
| 201      | Permission verification failed, usually the result returned by VerifyAccessToken.|
| 401      | Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types. |
| 801      | Capability not supported. |
| 13900042 | Unknown error                          |

**Example**

  ```ts
  import { BusinessError } from '@ohos.base';
  import picker from '@ohos.file.picker';
  
  async function checkPersistentPermissionExample() {
    try {
      let documentSelectOptions = new picker.DocumentSelectOptions();
      let documentPicker = new picker.DocumentViewPicker();
      let uris = await documentPicker.select(documentSelectOptions);
      let policyInfo: fileShare.PolicyInfo = {
        uri: uris[0], 
        operationMode: fileShare.OperationMode.READ_MODE,
      };
      let policies: Array<fileShare.PolicyInfo> = [policyInfo];
      fileShare.checkPersistentPermission(policies).then(async (data) => {
        let result: Array<boolean> = data;
        for (let i = 0; i < result.length; i++) {
          console.log("checkPersistentPermission result: " + JSON.stringify(result[i]));
          if(!result[i]){
            let info: fileShare.PolicyInfo = {
              uri: policies[i].uri, 
              operationMode: policies[i].operationMode,
            };
            let policy : Array<fileShare.PolicyInfo> = [info];
            await fileShare.persistPermission(policy);
          }
        }
      }).catch((err: BusinessError<Array<fileShare.PolicyErrorResult>>) => {
        console.error("checkPersistentPermission failed with error message: " + err.message + ", error code: " + err.code);
      });
    } catch (error) {
      let err: BusinessError = error as BusinessError;
      console.error('checkPersistentPermission failed with err: ' + JSON.stringify(err));
    }
  }
  ```