Image Upload using nodejs - node.js

Question

I am using Ionic v3 and and for backend used Nodejs.
var storage = multer.diskStorage({
destination: function(req, file, callback) {
callback(null, './uploads')
},
filename: function(req, file, callback) {
console.log(file)
callback(null, file.fieldname + '-' + Date.now() + path.extname(file.originalname))
}
});
var upload = multer({storage: storage});
To call this method we require req ,res through API call like below,
upload(req, res, function(err) {
res.end('File is uploaded')
});
My question that is it possible to call this upload function without API call(req,res) ? If yes how can we do ?
What i want to do is, I am developing chat application using ionic2 and nodejs where i can share image. That image should be upload to server side. How can I do for socket programming ?

Answer 1

If you want to upload image using base64 then you can use following code
socket.on('Upload_Image_base64', function(data)
{
var fs = require('fs');
var img = data.image64;
var imgname = new Date().getTime().toString();
imgname = data.userid + imgname + '.png';
var data = img.replace(/^data:image\/\w+;base64,/, "");
var buf = new Buffer(data, 'base64');
fs.writeFile(__dirname + "/uploads/" +imgname, buf);
});
// here data.image64 and data.userid --> is the parameter which we pass during socket event request.
For multi part - this may help you.
socket.on('Upload_Image', function(data)
{
var app = require('express')();
var multer = require('multer')
var storage = multer.diskStorage({
destination: function (req, file, cb) {
cb(null, 'uploads/')
},
filename: function (req, file, cb) {
cb(null, file.fieldname + '-' + Date.now())
}
})
var upload = multer({ storage: storage }).single(data.file);
console.log(data.file);
app.post('/', function (req, res)
{
upload(req,res,function(req,res)
{
if(err)
{
console.log("error uploading file");
}
else
{
console.log("uploaded");
}
});
});
});