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README.md
react-native-fetch-blob 
[
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A project committed to make file acess and transfer easier and effiecient for React Native developers.
TOC
About
This project was initially for solving the issue facebook/react-native#854, because React Native does not support Blob object and it will cause some problem when sending and receiving binary data. There’s aleady a PR merged into RN master branch which will probably solving the issue in the near future.
Now, this project is committed to make file acess and transfer more easier and more effiecient for React Native developers. We’ve implemented lot of file access function which plays well with our network module. For example, it can upload and download data directly into/from file system, which is much more performant (especially for large ones) than converting data to BASE64 passing them around through React JS Bridge, also, file stream support so that you can read large file not causing OOM error.
Installation
Install package from npm
npm install --save react-native-fetch-blob
Link package using rnpm
rnpm link
To Use 0.7.0+ you will need to upgrade your App to 0.27+ (Android)
In 0.7.0 we have removed Android AsyncHttpClient dependency and use OkHttp3+ dependency in react-native, therefore older project (pre 0.27 versions use OkHttp2) will not be compatible. As for 0.29 projects, since rnpm link is broken in 0.29, it’s recommended to upgrade too (otherwise you may need to manually link Android project).
To upgrade your project
$ react-native upgrade
you will need run rnpm link again after upgrade.
Manually link the package (Android)
If rnpm link command failed to link the package automatically, you might try manually link the package.
Open android/settings.gradle, and add these lines which will app RNFetchBlob Android project dependency to your app.
include ':app'
+ include ':react-native-fetch-blob'
+ project(':react-native-fetch-blob').projectDir = new File(rootProject.projectDir,' ../node_modules/react-native-fetch-blob/android')
Add this line to MainApplication.java, so that RNFetchBlob package becomes part of react native package.
...
+ import com.RNFetchBlob.RNFetchBlobPackage;
...
protected List<ReactPackage> getPackages() {
return Arrays.<ReactPackage>asList(
new MainReactPackage(),
+ new RNFetchBlobPackage()
);
}
};
...
If you still having problem on installing this package, please check the trouble shooting page or file an issue
Grant Permission to External storage for Android 5.0 or lower
Mechanism about granting Android permissions has slightly different since Android 6.0 released, please refer to Official Document.
If you’re going to access external storage (say, SD card storage) for Android 5.0 (or lower) devices, you might have to add the following line to AndroidManifest.xml.
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.rnfetchblobtest"
android:versionCode="1"
android:versionName="1.0">
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>
+ <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
+ <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
...
Also, if you’re going to use Android Download Manager you have to add this to AndroidManifetst.xml
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
+ <action android:name="android.intent.action.DOWNLOAD_COMPLETE"/>
</intent-filter>
Grant Access Permission for Android 6.0
Beginning in Android 6.0 (API level 23), users grant permissions to apps while the app is running, not when they install the app. So adding permissions in AndroidManifest.xml won’t work in Android 6.0 devices. To grant permissions in runtime, you might use modules like react-native-android-permissions.
Recipes
ES6
The module uses ES6 style export statement, simply use import to load the module.
import RNFetchBlob from 'react-native-fetch-blob'
ES5
If you’re using ES5 require statement to load the module, please add default. See here for more detail.
var RNFetchBlob = require('react-native-fetch-blob').default
Download example : Fetch files that needs authorization token
// send http request in a new thread (using native code)
RNFetchBlob.fetch('GET', 'http://www.example.com/images/img1.png', {
Authorization : 'Bearer access-token...',
// more headers ..
})
// when response status code is 200
.then((res) => {
// the conversion is done in native code
let base64Str = res.base64()
// the following conversions are done in js, it's SYNC
let text = res.text()
let json = res.json()
})
// Status code is not 200
.catch((errorMessage, statusCode) => {
// error handling
})
Download to storage directly
The simplest way is give a fileCache option to config, and set it to true. This will let the incoming response data stored in a temporary path without any file extension.
These files won’t be removed automatically, please refer to Cache File Management
RNFetchBlob
.config({
// add this option that makes response data to be stored as a file,
// this is much more performant.
fileCache : true,
})
.fetch('GET', 'http://www.example.com/file/example.zip', {
some headers ..
})
.then((res) => {
// the temp file path
console.log('The file saved to ', res.path())
})
Set Temp File Extension
Sometimes you might need a file extension for some reason. For instance, when using file path as source of Image component, the path should end with something like .png or .jpg, you can do this by add appendExt option to config.
RNFetchBlob
.config({
fileCache : true,
// by adding this option, the temp files will have a file extension
appendExt : 'png'
})
.fetch('GET', 'http://www.example.com/file/example.zip', {
some headers ..
})
.then((res) => {
// the temp file path with file extension `png`
console.log('The file saved to ', res.path())
// Beware that when using a file path as Image source on Android,
// you must prepend "file://"" before the file path
imageView = <Image source={{ uri : Platform.OS === 'android' ? 'file://' + res.path() : '' + res.path() }}/>
})
Use Specific File Path
If you prefer a specific path rather than random generated one, you can use path option. We’ve added a constant dirs in v0.5.0 that contains several common used directories.
let dirs = RNFetchBlob.fs.dirs
RNFetchBlob
.config({
// response data will be saved to this path if it has access right.
path : dirs.DocumentDir + '/path-to-file.anything'
})
.fetch('GET', 'http://www.example.com/file/example.zip', {
//some headers ..
})
.then((res) => {
// the path should be dirs.DocumentDir + 'path-to-file.anything'
console.log('The file saved to ', res.path())
})
These files won’t be removed automatically, please refer to Cache File Management
Upload example : Dropbox files-upload API
react-native-fetch-blob will convert the base64 string in body to binary format using native API, this process will be done in a new thread, so it’s async.
RNFetchBlob.fetch('POST', 'https://content.dropboxapi.com/2/files/upload', {
Authorization : "Bearer access-token...",
'Dropbox-API-Arg': JSON.stringify({
path : '/img-from-react-native.png',
mode : 'add',
autorename : true,
mute : false
}),
'Content-Type' : 'application/octet-stream',
// here's the body you're going to send, should be a BASE64 encoded string
// (you can use "base64" APIs to make one).
// The data will be converted to "byte array"(say, blob) before request sent.
}, base64ImageString)
.then((res) => {
console.log(res.text())
})
.catch((err) => {
// error handling ..
})
Upload a file from storage
If you’re going to use a file request body, just wrap the path with wrap API.
RNFetchBlob.fetch('POST', 'https://content.dropboxapi.com/2/files/upload', {
// dropbox upload headers
Authorization : "Bearer access-token...",
'Dropbox-API-Arg': JSON.stringify({
path : '/img-from-react-native.png',
mode : 'add',
autorename : true,
mute : false
}),
'Content-Type' : 'application/octet-stream',
// Change BASE64 encoded data to a file path with prefix `RNFetchBlob-file://`.
// Or simply wrap the file path with RNFetchBlob.wrap().
}, RNFetchBlob.wrap(PATH_TO_THE_FILE))
.then((res) => {
console.log(res.text())
})
.catch((err) => {
// error handling ..
})
Multipart/form-data example : Post form data with file and data
In version >= 0.3.0 you can also post files with form data, just put an array in body, with elements have property name, data, and filename(optional).
Elements have property filename will be transformed into binary format, otherwise it turns into utf8 string.
RNFetchBlob.fetch('POST', 'http://www.example.com/upload-form', {
Authorization : "Bearer access-token",
otherHeader : "foo",
'Content-Type' : 'multipart/form-data',
}, [
// element with property `filename` will be transformed into `file` in form data
{ name : 'avatar', filename : 'avatar.png', data: binaryDataInBase64},
// elements without property `filename` will be sent as plain text
{ name : 'name', data : 'user'},
{ name : 'info', data : JSON.stringify({
mail : 'example@example.com',
tel : '12345678'
})},
]).then((resp) => {
// ...
}).catch((err) => {
// ...
})
What if you want to upload a file in some field ? Just like upload a file from storage example, wrap data by wrap API (this feature is only available for version >= v0.5.0). On version >= 0.6.2, it is possible to set custom MIME type when appending file to form data.
RNFetchBlob.fetch('POST', 'http://www.example.com/upload-form', {
Authorization : "Bearer access-token",
otherHeader : "foo",
// this is required, otherwise it won't be process as a multipart/form-data request
'Content-Type' : 'multipart/form-data',
}, [
// append field data from file path
{
name : 'avatar',
filename : 'avatar.png',
// Change BASE64 encoded data to a file path with prefix `RNFetchBlob-file://`.
// Or simply wrap the file path with RNFetchBlob.wrap().
data: RNFetchBlob.wrap(PATH_TO_THE_FILE)
},
{
name : 'ringtone',
filename : 'ring.mp3',
// use custom MIME type
type : 'application/mp3',
// upload a file from asset is also possible in version >= 0.6.2
data : RNFetchBlob.wrap(RNFetchBlob.fs.asset('default-ringtone.mp3'))
}
// elements without property `filename` will be sent as plain text
{ name : 'name', data : 'user'},
{ name : 'info', data : JSON.stringify({
mail : 'example@example.com',
tel : '12345678'
})},
]).then((resp) => {
// ...
}).catch((err) => {
// ...
})
Upload/Download progress
In version >= 0.4.2 it is possible to know the upload/download progress. After 0.7.0 IOS and Android upload progress are supported.
RNFetchBlob.fetch('POST', 'http://www.example.com/upload', {
... some headers,
'Content-Type' : 'octet-stream'
}, base64DataString)
// listen to upload progress event
.uploadProgress((written, total) => {
console.log('uploaded', written / total)
})
// listen to download progress event
.progress((received, total) => {
console.log('progress', received / total)
})
.then((resp) => {
// ...
})
.catch((err) => {
// ...
})
Cancel Request
After 0.7.0 it is possible to cancel a HTTP request. When the request cancel, it will definately throws an promise rejection, be sure to catch it.
let task = RNFetchBlob.fetch('GET', 'http://example.com/file/1')
task.then(() => { ... })
// handle request cancelled rejection
.catch((err) => {
console.log(err)
})
// cancel the request, the callback function is optional
task.cancel((err) => { ... })
Android Media Scanner, and Download Manager Support
If you want to make a file in External Storage becomes visible in Picture, Downloads, or other built-in apps, you will have to use Media Scanner or Download Manager.
Media Scanner
Media scanner scan the file and categorize by given MIME type, if MIME type not specified, it will try to resolve the file using its file extension.
RNFetchBlob
.config({
// DCIMDir is in external storage
path : dirs.DCIMDir + '/music.mp3'
})
.fetch('GET', 'http://example.com/music.mp3')
.then((res) => RNFetchBlob.fs.scanFile([ { path : res.path(), mime : 'audio/mpeg' } ]))
.then(() => {
// scan file success
})
.catch((err) => {
// scan file error
})
Download Manager
When download large files on Android it is recommended to use Download Manager, it supports lot of native features like progress bar, and notification, also the download task will be handled by OS, and more effective.
When using DownloadManager, fileCache and path properties in config will not take effect, because Android DownloadManager can only store files to external storage. When download complete, DownloadManager will generate a file path so that you can deal with it.
RNFetchBlob
.config({
addAdnroidDownloads : {
useDownloadManager : true, // <-- this is the only thing required
// Optional, override notification setting (default to true)
notification : false,
// Optional, but recommended since android DownloadManager will fail when
// the url does not contains a file extension, by default the mime type will be text/plain
mime : 'text/plain',
description : 'File downloaded by download manager.'
}
})
.fetch('GET', 'http://example.com/file/somefile')
.then((resp) => {
// the path of downloaded file
resp.path()
})
Download Notification and Visibiliy in Download App (Android Only)
If you want to display a notification when file’s completely download to storage (as the above), or make the downloaded file visible in “Downloads” app. You have to add some options to config.
RNFetchBlob.config({
fileCache : true,
// android only options, these options be a no-op on IOS
addAndroidDownloads : {
// Show notification when response data transmitted
notification : true,
// Title of download notification
title : 'Great ! Download Success ! :O ',
// File description (not notification description)
description : 'An image file.',
mime : 'image/png',
// Make the file scannable by media scanner
meidaScannable : true,
}
})
.fetch('GET', 'http://example.com/image1.png')
.then(...)
File Access
File access APIs were made when developing v0.5.0, which helping us write tests, and was not planned to be a part of this module. However we realized that, it’s hard to find a great solution to manage cached files, every one who use this moudle may need these APIs for there cases.
Before start using file APIs, we recommend read Differences between File Source first.
File Access APIs
- asset (0.6.2)
- dirs
- createFile
- writeFile (0.6.0)
- appendFile (0.6.0)
- readFile (0.6.0)
- readStream
- writeStream
- unlink
- mkdir
- ls
- mv
- cp
- exists
- isDir
- stat
- lstat
- scanFile (Android only)
See File API for more information
File Stream
In v0.5.0 we’ve added writeStream and readStream, which allows your app read/write data from file path. This API creates a file stream, rather than convert whole data into BASE64 encoded string, it’s handy when processing large files.
When calling readStream method, you have to open the stream, and start to read data.
let data = ''
RNFetchBlob.fs.readStream(
// encoding, should be one of `base64`, `utf8`, `ascii`
'base64',
// file path
PATH_TO_THE_FILE,
// (optional) buffer size, default to 4096 (4095 for BASE64 encoded data)
// when reading file in BASE64 encoding, buffer size must be multiples of 3.
4095)
.then((ifstream) => {
ifstream.open()
ifstream.onData((chunk) => {
// when encoding is `ascii`, chunk will be an array contains numbers
// otherwise it will be a string
data += chunk
})
ifstream.onError((err) => {
console.log('oops', err)
})
ifstream.onEnd(() => {
<Image source={{ uri : 'data:image/png,base64' + data }}
})
})
When use writeStream, the stream is also opened immediately, but you have to write, and close by yourself.
RNFetchBlob.fs.writeStream(
PATH_TO_FILE,
// encoding, should be one of `base64`, `utf8`, `ascii`
'utf8',
// should data append to existing content ?
true)
.then((ofstream) => {
ofstream.write('foo')
ofstream.write('bar')
ofstream.close()
})
Cache File Management
When using fileCache or path options along with fetch API, response data will automatically stored into file system. The files will NOT removed unless you unlink it. There’re several ways to remove the files
// remove file using RNFetchblobResponse.flush() object method
RNFetchblob.config({
fileCache : true
})
.fetch('GET', 'http://example.com/download/file')
.then((res) => {
// remove cached file from storage
res.flush()
})
// remove file by specifying a path
RNFetchBlob.fs.unlink('some-file-path').then(() => {
// ...
})
You can also grouping requests by using session API, and use dispose to remove them all when needed.
RNFetchblob.config({
fileCache : true
})
.fetch('GET', 'http://example.com/download/file')
.then((res) => {
// set session of a response
res.session('foo')
})
RNFetchblob.config({
// you can also set session beforehand
session : 'foo'
fileCache : true
})
.fetch('GET', 'http://example.com/download/file')
.then((res) => {
// ...
})
// or put an existing file path to the session
RNFetchBlob.session('foo').add('some-file-path')
// remove a file path from the session
RNFetchBlob.session('foo').remove('some-file-path')
// list paths of a session
RNFetchBlob.session('foo').list()
// remove all files in a session
RNFetchBlob.session('foo').dispose().then(() => { ... })
Self-Signed SSL Server
By default, react-native-fetch-blob does NOT allow connection to unknown certification provider since it’s dangerous. If you’re going to connect a server with self-signed certification, add trusty to config. This function is available for version >= 0.5.3
RNFetchBlob.config({
trusty : true
})
.then('GET', 'https://mysite.com')
.then((resp) => {
// ...
})
Changes
| Version | |
|---|---|
| 0.7.4 | Fix app crash problem in version > 0.27 |
| 0.7.3 | Fix OkHttp dependency issue in version < 0.29 |
| 0.7.2 | Fix cancel request bug |
| 0.7.1 | Fix #57 ios module could not compile on ios version <= 9.3 |
| 0.7.0 | Add support of Android upload progress, and remove AsyncHttpClient dependency from Android native implementation. |
| 0.6.4 | Fix rnpm link script. |
| 0.6.3 | Fix performance issue on IOS, increase max concurrent request limitation from 1. |
| 0.6.2 | Add support of asset file and camera roll files, Support custom MIME type when sending multipart request, thanks @smartt |
| 0.6.1 | Fix #37 progress report API issue on IOS |
| 0.6.0 | Add readFile and writeFile API for easier file access, also added Android download manager support. |
| 0.5.8 | Fix #33 PUT request will always be sent as POST on Android |
| 0.5.7 | Fix #31 #30 Xcode pre 7.3 build error |
| 0.5.6 | Add support for IOS network status indicator. Fix file stream ASCII reader bug. |
| 0.5.5 | Remove work in progress code added in 0.5.2 which may cause memory leaks. |
| 0.5.4 | Fix #30 #31 build build error, and improve memory efficiency. |
| 0.5.3 | Add API for access untrusted SSL server |
| 0.5.2 | Fix improper url params bug #26 and change IOS HTTP implementation from NSURLConnection to NSURLSession |
| 0.5.0 | Upload/download with direct access to file storage, and also added file access APIs |
| 0.4.2 | Supports upload/download progress |
| 0.4.1 | Fix upload form-data missing file extension problem on Android |
| 0.4.0 | Add base-64 encode/decode library and API |
| ~0.3.0 | Upload/Download octet-stream and form-data |
Development
If you’re interested in hacking this module, check our development guide, there might be some helpful information. Please feel free to make a PR or file an issue.