[英]NodeJS/Restify: How can I recieve file upload in API?
我正在嘗試從移動應用程序上傳一個圖像文件(它是用本機編寫的,現在在iOS上運行)。
該文件將發送到我的REST API,如下所示。 我有兩個問題:
req.body
,因為它總是一個空對象,雖然標題是正確提交的。 gridfs-stream
將收到的文件寫入我的數據庫(GridFS),但我不明白將該代碼放在何處。 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)
})
我試圖找到錯誤,但我沒有找到它,所以這里是我在API中獲得的數據:
頭
{
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'
}
身體
{ }
為什么body
空虛?
React Native文件上傳
這就是我將文件發送到API的方式。 我還向您展示了一些變量的內容:
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)
})
}
照片
{
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'
}
配置
'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' }
]
]
}
}
我認為data
(應該在config
作為主體發送)具有錯誤的格式。 為什么數組中有數組?
下面的示例在React Native部分使用react-native-fetch-blob ,使用Express和Formidable的 Nodej在服務器端解析表單。
在確定用戶是否上傳了照片或視頻后,我們首先上傳文件:
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);
});
};
同樣,接收文件並相應地加載數據:
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);
};
並使用控制器功能:
let route = express.Router();
// other controller functions...
route.post('/upload', uploadController.upload);
app.use(route);
請務必閱讀代碼中包含的注釋。 Datapath是使用react-native-image-picker后創建的媒體路徑(不是base64字符串)。 您可以使用react-native-progress顯示上載進度。
查看react-native-fetch-blob的multipartform-data部分以供進一步參考: https : //github.com/wkh237/react-native-fetch-blob#multipartform-data-example-post-form-data-with-文件和數據
你可以使用co-busboy
節點模塊來編寫中間件,這是koa
一個例子:
首先,您需要通過npm
或yarn
安裝co-busboy
:
npm i co-busboy -S
或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())
參考:
您需要對圖像進行base64編碼,然后將主體作為json發送(標題Content-Type設置為application / json)
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