I'm trying to upload an image file from a mobile application (which is written in react native and now running on iOS).
The file is send to my REST API, which is shown below. I got two problems with that:
- I do not get
req.body, as it is always an empty object, although headers are submitted correctly. - I want to write the recieved file to my DB (GridFS) via
gridfs-stream, but I don't understand where to put that code.
API
const restify = require('restify') const winston = require('winston') const bunyanWinston = require('bunyan-winston-adapter') const mongoose = require('mongoose') const Grid = require('gridfs-stream') const config = require('../config') // Configure mongoose to work with javascript promises mongoose.Promise = global.Promise // Setting up server const server = restify.createServer({ name: config.name, version: config.version, log: bunyanWinston.createAdapter(log) }) server.use(restify.plugins.multipartBodyParser()) server.listen(config.port, () => { mongoose.connection.on('open', (err) => { server.post('/upload', (req, res, next) => { console.log(req.headers) // <- returns headers as expected /* Problem 1 */ console.log(req.body) // <- is empty object (unexpected) res.send(200, { message: 'successful upload' }) res.end() }) }) global.db = mongoose.connect(config.db.uri, { useMongoClient: true }) /* Problem 2: The recieved file should be stored to DB via `gridfs-stream` */ // I think this is the wrong place for this line... var gfs = Grid(global.db, mongoose.mongo) }) I tried to find the error, but I did not find it, so here is the data, which I get in my API:
headers
{ host: 'localhost:3000', 'content-type': 'multipart/form-data; boundary=pUqK6oKvY65OfhaQ3h01xWg0j4ajlanAA_e3MXVSna4F8kbg-zT0V3-PeJQm1QZ2ymcmUM', 'user-agent': 'User/1 CFNetwork/808.2.16 Darwin/15.6.0', connection: 'keep-alive', accept: '*/*', 'accept-language': 'en-us', 'accept-encoding': 'gzip, deflate', 'content-length': '315196' } body
{ } Why is body empty?
React Native file upload
This is how I am sending the file to the API. I also show you the content of some variables:
async function upload (photo) { console.log('photo', photo); // OUTPUT SHOWN BELOW if (photo.uri) { // Create the form data object var data = new FormData() data.append('picture', { uri: photo.uri, name: 'selfie.jpg', type: 'image/jpg' }) // Create the config object for the POST const config = { method: 'POST', headers: { 'Accept': 'application/json' }, body: data } console.log('config', config); // OUTPUT SHOWN BELOW fetchProgress('http://localhost:3000/upload', { method: 'post', body: data }, (progressEvent) => { const progress = progressEvent.loaded / progressEvent.total console.log(progress) }).then((res) => console.log(res), (err) => console.log(err)) } } const fetchProgress = (url, opts = {}, onProgress) => { console.log(url, opts) return new Promise((resolve, reject) => { var xhr = new XMLHttpRequest() xhr.open(opts.method || 'get', url) for (var k in opts.headers || {}) { xhr.setRequestHeader(k, opts.headers[k]) } xhr.onload = e => resolve(e.target) xhr.onerror = reject if (xhr.upload && onProgress) { xhr.upload.onprogress = onProgress // event.loaded / event.total * 100 ; //event.lengthComputable } xhr.send(opts.body) }) } photo
{ fileSize: 314945, origURL: 'assets-library://asset/asset.JPG?id=106E99A1-4F6A-45A2-B320-B0AD4A8E8473&ext=JPG', longitude: -122.80317833333334, fileName: 'IMG_0001.JPG', height: 2848, width: 4288, latitude: 38.0374445, timestamp: '2011-03-13T00:17:25Z', isVertical: false, uri: 'file:///Users/User/Library/Developer/CoreSimulator/Devices/D3FEFFA8-7446-42AB-BC7E-B6EB88DDA840/data/Containers/Data/Application/17CE8C0A-B781-4E56-9347-857E74055119/Documents/images/69C2F27F-9EEE-4611-853E-FC7FF6E5C373.jpg' } config
'http://localhost:3000/upload', { method: 'post', body: { _parts: [ [ 'picture', { uri: 'file:///Users/User/Library/Developer/CoreSimulator/Devices/D3FEFFA8-7446-42AB-BC7E-B6EB88DDA840/data/Containers/Data/Application/17CE8C0A-B781-4E56-9347-857E74055119/Documents/images/69C2F27F-9EEE-4611-853E-FC7FF6E5C373.jpg', name: 'selfie.jpg', type: 'image/jpg' } ] ] } } I think data (which should be send as body in config) has wrong format. Why is there an array in an array?
3 Answers
Answers 1
The example below uses react-native-fetch-blob at React Native part, and Nodejs with Express and Formidable to parse form at the server side.
Let's first upload the file after determining whether user uploaded a photo or video:
RNFetchBlob.fetch( 'POST', Constants.UPLOAD_URL + '/upload', { 'Content-Type': 'multipart/form-data' }, [ { name: this.state.photoURL ? 'image' : 'video', filename: 'avatar-foo.png', type: 'image/foo', data: RNFetchBlob.wrap(dataPath) }, // elements without property `filename` will be sent as plain text { name: 'email', data: this.props.email }, { name: 'title', data: this.state.text } ] ) // listen to upload progress event .uploadProgress((written, total) => { console.log('uploaded', written / total); this.setState({ uploadProgress: written / total }); }) // listen to download progress event .progress((received, total) => { console.log('progress', received / total); }) .then(res => { console.log(res.data); // we have the response of the server this.props.navigation.goBack(); }) .catch(err => { console.log(err); }); }; Similarly, receive file and load the data accordingly:
exports.upload = (req, res) => { var form = new formidable.IncomingForm(); let data = { email: '', title: '', photoURL: '', videoURL: '', }; // specify that we want to allow the user to upload multiple files in a single request form.multiples = true; // store all uploads in the /uploads directory form.uploadDir = path.join(__dirname, '../../uploads'); form.on('file', (field, file) => { let suffix = field === 'image' ? '.png' : '.mp4'; let timestamp = new Date().getTime().toString(); fs.rename(file.path, path.join(form.uploadDir, timestamp + suffix)); //save file with timestamp. data[field === 'image' ? 'photoURL' : 'videoURL'] = timestamp + suffix; }); form.on('field', (name, value) => { data[name] = value; }); form.on('error', err => { console.log('An error has occured: \n ' + err); }); form.on('end', () => { // now we have a data object with fields updated. }); form.parse(req); }; And use the controller function:
let route = express.Router(); // other controller functions... route.post('/upload', uploadController.upload); app.use(route); Make sure you read the comments included in the code. Datapath is media's path (not base64 string) created after using react-native-image-picker . You can use react-native-progress to show upload progress.
Check out multipartform-data section of react-native-fetch-blob for further reference: https://github.com/wkh237/react-native-fetch-blob#multipartform-data-example-post-form-data-with-file-and-data
Answers 2
you can use co-busboy node module to write a middleware, this is an example for koa:
Firstly, you need to install co-busboy by npm or yarn:
npm i co-busboy -S or yarn add co-busboy
// upload.js var parse = require('co-busboy') var fs = require('fs') var path = require('path') var upload = function * (next) { var parts = parse(this, { autoFields: true }) while(var part = yield parts) { part.pipe(fs.createReadStream(path.join('uploadPath', part.filename))) } yield next } module.exports = () => upload // app.js var upload = require('upload') app.use(upload())Reference:
Answers 3
You need to base64 encode the image and then send the body as a json (with the header Content-Type set to application/json)
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