MEAN Stack File uploads

Question 1

I recently did something just like this. I used angular-file-upload. You'll also want node-multiparty for your endpoint to parse the form data. Then you could use s3 for uploading the file to s3.

Here's some of my [edited] code.

Angular Template

<button>
  Upload <input type="file" ng-file-select="onFileSelect($files)">
</button>

Angular Controller

$scope.onFileSelect = function(image) {
  $scope.uploadInProgress = true;
  $scope.uploadProgress = 0;

  if (angular.isArray(image)) {
    image = image[0];
  }

  $scope.upload = $upload.upload({
    url: '/api/v1/upload/image',
    method: 'POST',
    data: {
      type: 'profile'
    },
    file: image
  }).progress(function(event) {
    $scope.uploadProgress = Math.floor(event.loaded / event.total);
    $scope.$apply();
  }).success(function(data, status, headers, config) {
    AlertService.success('Photo uploaded!');
  }).error(function(err) {
    $scope.uploadInProgress = false;
    AlertService.error('Error uploading file: ' + err.message || err);
  });
};

Route

var uuid = require('uuid'); // https://github.com/defunctzombie/node-uuid
var multiparty = require('multiparty'); // https://github.com/andrewrk/node-multiparty
var s3 = require('s3'); // https://github.com/andrewrk/node-s3-client

var s3Client = s3.createClient({
  key: '<your_key>',
  secret: '<your_secret>',
  bucket: '<your_bucket>'
});

module.exports = function(app) {
  app.post('/api/v1/upload/image', function(req, res) {
    var form = new multiparty.Form();
    form.parse(req, function(err, fields, files) {
      var file = files.file[0];
      var contentType = file.headers['content-type'];
      var extension = file.path.substring(file.path.lastIndexOf('.'));
      var destPath = '/' + user.id + '/profile' + '/' + uuid.v4() + extension;

      var headers = {
        'x-amz-acl': 'public-read',
        'Content-Length': file.size,
        'Content-Type': contentType
      };
      var uploader = s3Client.upload(file.path, destPath, headers);

      uploader.on('error', function(err) {
        //TODO handle this
      });

      uploader.on('end', function(url) {
        //TODO do something with the url
        console.log('file opened:', url);
      });
    });
  });
}

I changed this from my code, so it may not work out of the box, but hopefully it's helpful!

Question 2

Recently a new package was added to the list of packages on mean.io. It's a beauty!

Simply run:

$ mean install mean-upload

This installs the package into the node folder but you have access to the directives in your packages.

http://mean.io/#!/packages/53ccd40e56eac633a3eee335

On your form view, add something like this:

    <div class="form-group">
        <label class="control-label">Images</label>
        <mean-upload file-dest="'/packages/photos/'" upload-file-callback="uploadFileArticleCallback(file)"></mean-upload>
        <br>
        <ul class="list-group">
            <li ng-repeat="image in article.images" class="list-group-item">
                {{image.name}}
                <span class="glyphicon glyphicon-remove-circle pull-right" ng-click="deletePhoto(image)"></span>
            </li>
        </ul>
    </div>

And in your controller:

    $scope.uploadFileArticleCallback = function(file) {
      if (file.type.indexOf('image') !== -1){
          $scope.article.images.push({
            'size': file.size,
            'type': file.type,
            'name': file.name,
            'src': file.src
          });
      }
      else{
          $scope.article.files.push({
            'size': file.size,
            'type': file.type,
            'name': file.name,
            'src': file.src
          });
      }
    };

    $scope.deletePhoto = function(photo) {
        var index = $scope.article.images.indexOf(photo);
        $scope.article.images.splice(index, 1);
    }

Enjoy!

Question 3

Mean-upload has been obsoleted and is now called "upload". It is managed in - https://git.mean.io/orit/upload

Question 4

I know this post is old. I came across it and @kentcdodds had an answer that i really liked, but the libraries he used are now out of date and I could not get them to work. So after some research i have a newer similar solution I want to share.

HTML using ng-upload

<form >
    <div style="margin-bottom: 15px;">
        <button type="file" name="file" id="file" ngf-select="uploadFiles($file, $invalidFiles)" accept="image/*" ngf-max-height="1000" ngf-max-size="1MB">Select File</button>
    </div>
</form>

INCLUDE ng-upload module

download it, references the files and include the module

var app = angular.module('app', ['ngFileUpload']);

this will give you access to the Upload service.

Controller code

$scope.uploadFiles = function(file, errFiles) {
    $scope.f = file;
    $scope.errFile = errFiles && errFiles[0];
    if (file) {
        file.upload = Upload.upload({
            url: 'you-api-endpoint',
            data: {file: file}
        });

        //put promise and event watchers here if wanted
    }   
};

NODE api code

All the code below is in a separate route file which is required in my main server.js file.

require('./app/app-routes.js')(app, _);

var fs = require('fs');
var uuid = require('uuid');
var s3 = require('s3fs'); // https://github.com/RiptideElements/s3fs
var s3Impl = new s3('bucketname', {
    accessKeyId: '<your access key id>',
    secretAccessKey: '< your secret access key >'
});

var multiparty = require('connect-multiparty');
var multipartyMiddleware = multiparty();

module.exports = function(app, _) {
    app.use(multipartyMiddleware);


    app.post('/your-api-endpoint',function(req, res){

    var file = req.files.file; // multiparty is what allows the file to to be accessed in the req
    var stream = fs.createReadStream(file.path);
    var extension = file.path.substring(file.path.lastIndexOf('.'));
    var destPath = '/' + req.user._id + '/avatar/' +  uuid.v4() + extension;
    var base = 'https://you-bucket-url';
    return s3Impl.writeFile(destPath, stream, {ContentType: file.type}).then(function(one){
        fs.unlink(file.path);
        res.send(base + destPath); 
    });
});

All i was trying to do was upload a unique avatar for a user. Hope this helps!!