React-native-scoped-storage NPM

react-native-scoped-storage

Since the release of Android 10, Google has made Scoped Storage the default way to access and read/write files on an Android device but up until Android 11, it was possible to override this by putting android:requestLegacyExternalStorage="true" in AndroidManifest.xml.

However, this is changing fast since the start of 2021. Google is enforcing all apps to use Scoped Storage to store or read files on a user's device. This library provides an API for react-native to use scoped storage in their apps. Scoped storage allows you to prompt the user that you need access to some file/folders. The user can the allow access to their desired location. It is your responsibility to store the uri you recieve for later use.

Remember, you do not need WRITE_EXTERNAL_STORAGE permission in you AndroidManifest.xml file using this library.

Until React Native targets API 29, you do not need this library. But if you are targeting API 30, it's not possible to access user's files and folders without scoped storage.

Read my blog: Scoped Storage in React Native: New Android 10 API for File System Access

Getting started

Install the library

yarn add react-native-scoped-storage

npm install react-native-scoped-storage

How this works

Unlike regular file storage on android, scoped storage works differently in that you can only have access to those parts of user's phone storage where the user has allowed you to read/write. Let's see an example:

We will ask the user to give us permission to a folder on their phone were we can read/write data. This folder can be anywhere in the phone. For this purpose will will launch the phone's file manager

import * as ScopedStorage from "react-native-scoped-storage"

let dir = await ScopedStorage.openDocumentTree(true);

Once the user selects a directory, we will recieve the information about the directory and its uri. Now we can use this uri to read/write.

await ScopedStorage.writeFile(dir.uri,"myimage.png","image/png",imageData,"base64");

// We can store this directory in AsyncStorage for later use.
await AsyncStorage.setItem('userMediaDirectory',JSON.stringify(dir));

And later if we want to access the uris where we have access to read/write:

// Get the directory we requested earlier
let dir = await AsyncStorage.getItem("userMediaDirectory");
dir = JSON.parse(dir);

// Get list of persisted Uris
const persistedUris = await ScopedStorage.getPersistedUriPermissions();

// Check if the directory uri exists in the list of uris where we have access to read/write.
if (persistedUris.indexOf(dir.uri) !== -1) {

    // If uri is found, we can proceed to write/read data.
    await ScopedStorage.writeFile(dir.uri,"myimage.png","image/png",imageData,"base64");
} else {
    // We can request for permission again and store the new directory if access has been revoked by user here.
}

Asking for directory to store file everytime

This works similar to it does in the browser, if you try to save an image or any asset from the webpage, it will ask you for a location where this file should be stored everytime.

import * as ScopedStorage from "react-native-scoped-storage"

let file = await ScopedStorage.createDocument("myimage.png","image/png",imageBase64Data,"base64");

// Remember that the returned file can have a different name than you provide because user can change it upon saving to a folder.

Type aliases

FileType

Functions

Type aliases

FileType

Ƭ FileType: Object

Type declaration

Name	Type	Description
`data`	`string`	data read from the file
`lastModified`	`number`	Last modified date of the file or directory
`mime`	`string`	mime type of the file
`name`	`string`	Name of the file or directory
`path`	`string`	Storage path for the file
`type`	`"file"` \| `"directory"`	-
`uri`	`string`	Document Tree Uri for the file or directory

Defined in

index.ts:5

Functions

copyFile

▸ copyFile(source, destination, callback): Promise<void>

Create a new file at the given directory.

Parameters

Name	Type	Description
`source`	`string`	Source file (Supports file:// & content:// uris)
`destination`	`string`	Destination file (Supports file:// & content:// uris)
`callback`	() => `void`	-

Returns

Promise<void>

Defined in

index.ts:170

createDirectory

▸ createDirectory(uri, dirName): Promise<FileType>

Create a directory at the given path.

Parameters

Name	Type	Description
`uri`	`string`	-
`dirName`	`string`	Name of the new directory

Returns

Promise<FileType>

Defined in

index.ts:117

createDocument

▸ createDocument(fileName, mime, data, encoding?): Promise<FileType>

Open Document picker to create a file at the user specified location.

Parameters

Name	Type	Description
`fileName`	`string`	Name of the file to create.
`mime`	`string`	mime of the file to create. eg image/jpeg
`data`	`string`	Data to write to the file once it is created.
`encoding?`	`"utf8"` \| `"base64"` \| `"ascii"`	Encoding of the dat you are writing.

Returns

Promise<FileType>

Defined in

index.ts:36

createFile

▸ createFile(uri, fileName, mime): Promise<FileType>

Create a new file at the given directory.

Parameters

Name	Type	Description
`uri`	`string`	-
`fileName`	`string`	Name of the new file.
`mime`	`string`	Mime type of the file, e.g. image/jpeg

Returns

Promise<FileType>

Defined in

index.ts:155

deleteFile

▸ deleteFile(uri): Promise<boolean>

Delete a file or directory at the given path.

Parameters

Name	Type	Description
`uri`	`string`	Path to the file or directory to delete

Returns

Promise<boolean>

Defined in

index.ts:109

getPersistedUriPermissions

▸ getPersistedUriPermissions(): Promise<string[]>

Name	Type	Default value	Description
`uri`	`string`	`undefined`	-
`data`	`string`	`undefined`	Data you want to write
`fileName?`	`string`	`undefined`	Name of the file (Optional if writing to an existing file)
`mime?`	`string`	`undefined`	Mime of the file. eg image/jpeg (Optional if writing to an existing file)
`encoding?`	`"utf8"` \| `"base64"` \| `"ascii"`	`undefined`	Encoding of the data you are writing.
`append`	`boolean`	`false`	Should the data be appended to the existing data in file?

Returns

Promise<string>

Defined in

index.ts:132

Thanks to

rn-fetch-blob for the amazing library. Some part of code is taken from there.

I want to contribute

That is awesome news! There is alot happening at a very fast pace in this library right now. Every little help is precious. You can contribute in many ways:

Suggest code improvements on native iOS and Android
If you have suggestion or idea you want to discuss, open an issue.
Open an issue if you want to make a pull request, and tell me what you want to improve or add so we can discuss