react-native-blob-courier

Use this library to efficiently download and upload data in React Native. The library was inspired by rn-fetch-blob, and is focused strictly on http file transfers.

Installation

Install using yarn

yarn add react-native-blob-courier

Or install using npm

npm install react-native-blob-courier

Requirements

• Android >= 24
• Android Gradle Plugin >= 7.5.1
• iOS >= 13.0
• JDK >= 11
• React Native >= 0.69.x

Note: you may have success with earlier versions of React Native but these are neither tested nor supported.

Usage

The library provides both a fluent and a more concise interface. In the examples the concise approach is applied; fluent interface is demonstrated later in this document.

Straightforward down- and upload

import BlobCourier from 'react-native-blob-courier';

// ...

// Download a file
const request0 = {
  filename: '5MB.zip',
  method: 'GET',
  mimeType: 'application/zip',
  url: 'http://ipv4.download.thinkbroadband.com/5MB.zip',
};

const fetchedResult = await BlobCourier.fetchBlob(request0);
console.log(fetchedResult);
// {
//   "data": {
//     "absoluteFilePath": "/path/to/app/cache/5MB.zip",
//     "response": {
//       "code":200,
//       "headers": {
//         "some_header": "some_value",
//         ...
//       }
//     },
//   },
//   "type":"Unmanaged"
// }

// ...

// Upload a file
const absoluteFilePath = fetchedResult.data.absoluteFilePath;

const request1 = {
  absoluteFilePath,
  method: 'POST',
  mimeType: 'application/zip',
  url: 'https://file.io',
};

const uploadResult = await BlobCourier.uploadBlob(request1);

console.log(uploadResult):
// {
//   "response": {
//     "code": {
//     "data": "<some response>",
//     "headers": {
//       "some_header": "some_value",
//        ...
//      }
//   }
// }

// Multipart file upload
const absoluteFilePath = fetchedResult.data.absoluteFilePath;

const request2 = {
  method: 'POST',
  parts: {
    body: {
      payload: 'some_value',
      type: 'string',
    },
    file: {
      payload: {
        absoluteFilePath,
        mimeType: 'application/zip',
      },
      type: 'file',
    },
  },
  url: 'https://file.io',
};

const multipartUploadResult = await BlobCourier.uploadBlob(request1);

console.log(multipartUploadResult):
// {
//   "response": {
//     "code": {
//     "data": "<some response>",
//     "headers": {
//       "some_header": "some_value",
//        ...
//      }
//   }
// }

Transfer progress reporting

import BlobCourier from 'react-native-blob-courier';

// ...

// Download a file
const request0 = {
  // ...
  onProgress: ((e: BlobProgressEvent) => {
    console.log(e)
    // {
    //  "written": <some_number_of_bytes_written>,
    //  "total": <some_total_number_of_bytes>
    // }
  })
};

const fetchedResult = await BlobCourier.fetchBlob(request0);

// ...

// Upload a file
const request1 = {
  // ...
  onProgress: ((e: BlobProgressEvent) => {
    console.log(e)
    // {
    //  "written": <some_number_of_bytes_written>,
    //  "total": <some_total_number_of_bytes>
    // }
  })
};

const uploadResult = await BlobCourier.uploadBlob(request1)

// ...

// Set progress updater interval
const request2 = ...

const someResult =
  await BlobCourier
    .fetchBlob({
      ...request2,
      progressIntervalMilliseconds: 1000,
    });

Managed download on Android (not available on iOS)

import BlobCourier from 'react-native-blob-courier';

// ...

const request = {
  android: {
    useDownloadManager: true // <--- set useDownloadManager to "true"
  },
  filename: '5MB.zip',
  method: 'GET',
  mimeType: 'application/zip',
  url: 'http://ipv4.download.thinkbroadband.com/5MB.zip',
};

const fetchResult = await BlobCourier.fetchBlob(request);

console.log(fetchedResult);
// {
//   "data": {
//     "result": "SUCCESS",
//     "absoluteFilePath": "/path/to/app/cache/5MB.zip"
//   },
//   "type":"Managed"
// }

Multipart upload

Sometimes order of multipart fields matters, and Blob Courier respects the order in which parts are provided. There is a catch though: due to how JavaScript works, when object keys are regular strings they are kept in the order they were added unless the keys are strings containing numbers, e.g.:

Object.keys({
  "b": "some_value1",
  "c": "some_value2",
  "a": "some_value3",
})

// ['b', 'c', 'a']

Object.keys({
  "b": "some_value1",
  "c": "some_value2",
  "a": "some_value3",
  "3": "some_value4",
  "2": "some_value5",
  "1": "some_value6",
});

// ['1', '2', '3', 'b', 'c', 'a']

The way to work around this, is to wrap all keys in a Symbol, by using Symbol.for. Do not use Symbol(<value>), this will not work, e.g.:

Object.getOwnPropertySymbols({
  [Symbol.for("b")]: "some_value1",
  [Symbol.for("c")]: "some_value2",
  [Symbol.for("a")]: "some_value3",
  [Symbol.for("3")]: "some_value4",
  [Symbol.for("2")]: "some_value5",
  [Symbol.for("1")]: "some_value6",
});

// [Symbol('b'), Symbol('c'), Symbol('a'), Symbol('3'), Symbol('2'), Symbol('1')]

Cancel request

import BlobCourier from 'react-native-blob-courier';

// ...

const abortController = new AbortController();

const { signal } = abortController;

const request0 = {
  // ...
  signal,
};

try {
  BlobCourier.fetchBlob(request0);

  abortController.abort();
} catch (e) {
  if (e.code === ERROR_CANCELED_EXCEPTION) {
    // ...
  }
}

// ...

Fluent interface

Blob Courier provides a fluent interface, that both protects you from using impossible setting combinations and arguably improves readability.

const req0 = ...

const someResult =
  await BlobCourier
    .settings({
      progressIntervalMilliseconds: 1000,
    })
    .onProgress((e: BlobProgressEvent) => {
      // ...
    })
    .useDownloadManagerOnAndroid({
      description: "Some file description",
      enableNotification: true,
      title: "Some title"
    })
    .fetchBlob(req0)

Available methods

fetchBlob(input: BlobFetchRequest)

Required

Optional

Response

uploadBlob(input: BlobUploadRequest)

Alias for:

const someResult =
  await BlobCourier
   // ...
   .uploadParts({
     headers,
     method,
     parts: {
       file:
         payload: {
           absoluteFilePath,
           filename,
           mimeType,
         },
         type: 'file',
       },
     },
     returnResponse,
     url,
   })

Required

Optional

uploadParts(input: BlobMultipartUploadRequest)

Required

Optional

Response

AndroidDownloadManagerSettings

AndroidSettings

BlobManagedData

BlobMultipart

Required

BlobMultipartFormData

Type of string | { [key:string] : any }

BlobMultipartFormDataFile

Required

Optional

BlobProgressEvent

BlobUnmanagedData

BlobUnmanagedHttpResponse

IOSSettings

Example app

You can find an example of how to use the library in the example directory.

Android

Permissions

Android 5.1 and below (API level < 23)

Add the following line to AndroidManifest.xml.

<manifest xmlns:android="http://schemas.android.com/apk/res/android" (...)>

+   <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
+   <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+   <uses-permission android:name="android.permission.DOWNLOAD_WITHOUT_NOTIFICATION" />
    (...)
    <application (...)>
      <activity (...)>
        <intent-filter>
          (...)
+          <action android:name="android.intent.action.DOWNLOAD_COMPLETE"/>
        </intent-filter>
    (...)

Android 6.0+ (API level 23+)

Grant permissions using the PermissionAndroid API, like so:

const function App = () => {

  // ...

  React.useEffect(() => {
    const requestPermissionAsync = async () => {
      try {
        await PermissionsAndroid.request(
          PermissionsAndroid.PERMISSIONS.WRITE_EXTERNAL_STORAGE
        );

        // ...
      } catch (err) {
        console.error(err);
      }

      // ...
    };

    requestPermissionAsync();
  }, []);

  // ...

iOS

Add to Info.plist of your app:

<key>NSAllowsArbitraryLoads</key>
<true/>

Using the integrated download manager for Android

This library allows you to use the integrated download manager on Android, this option is not available for iOS.

To enable the download manager, simply set the request's useDownloadManager property of field android to true when passing it to fetchBlob, or call the useDownloadManagerOnAndroid method when using the fluent interface.

Shared directories

As this library is focused on transferring files, it only supports storage to the app's cache and data directories. To move files from these app specific directories to other locations on the filesystem, use another library like @react-native-community/cameraroll, e.g.:

import BlobCourier from 'react-native-blob-courier';
import CameraRoll from '@react-native-community/cameraroll';

// ...

const request = {
  filename: 'teh_cage640x360.png',
  method: 'GET',
  mimeType: 'image/png',
  url: 'https://www.placecage.com/640/360',
};

const cageResult = await BlobCourier.fetchBlob(request)

const cageLocalPath = cageResult.data.absoluteFilePath

CameraRoll.save(cageLocalPath);

Contributing

See the contributing guide to learn how to contribute to the repository and the development workflow.

Code of Conduct

Contributor Code of Conduct. By participating in this project you agree to abide by its terms.

License

MPL-2.0