Save files in Meteor

README.md

Create a Meteor app and put the client_/server_ files in a client/server directories. Also, create a public dir to save the uploaded files.

client_example.html

Template.example.events({
  'change input': function(ev) {  
    _.each(ev.srcElement.files, function(file) {
      Meteor.saveFile(file, file.name);
    });
  }
});

client_example.js

<template name="example">
<input type=file />
</template>

client_save_file.js

/**
 * @blob (https://developer.mozilla.org/en-US/docs/DOM/Blob)
 * @name the file's name
 * @type the file's type: binary, text (https://developer.mozilla.org/en-US/docs/DOM/FileReader#Methods) 
 *
 * TODO Support other encodings: https://developer.mozilla.org/en-US/docs/DOM/FileReader#Methods
 * ArrayBuffer / DataURL (base64)
 */
Meteor.saveFile = function(blob, name, path, type, callback) {
  var fileReader = new FileReader(),
    method, encoding = 'binary', type = type || 'binary';
  switch (type) {
    case 'text':
      // TODO Is this needed? If we're uploading content from file, yes, but if it's from an input/textarea I think not...
      method = 'readAsText';
      encoding = 'utf8';
      break;
    case 'binary': 
      method = 'readAsBinaryString';
      encoding = 'binary';
      break;
    default:
      method = 'readAsBinaryString';
      encoding = 'binary';
      break;
  }
  fileReader.onload = function(file) {
    Meteor.call('saveFile', file.srcElement.result, name, path, encoding, callback);
  }
  fileReader[method](blob);
}

server_save_file.js

/**
 * TODO support other encodings:
 * http://stackoverflow.com/questions/7329128/how-to-write-binary-data-to-a-file-using-node-js
 */
Meteor.methods({
  saveFile: function(blob, name, path, encoding) {
    var path = cleanPath(path), fs = __meteor_bootstrap__.require('fs'),
      name = cleanName(name || 'file'), encoding = encoding || 'binary',
      chroot = Meteor.chroot || 'public';
    // Clean up the path. Remove any initial and final '/' -we prefix them-,
    // any sort of attempt to go to the parent directory '..' and any empty directories in
    // between '/////' - which may happen after removing '..'
    path = chroot + (path ? '/' + path + '/' : '/');
    
    // TODO Add file existance checks, etc...
    fs.writeFile(path + name, blob, encoding, function(err) {
      if (err) {
        throw (new Meteor.Error(500, 'Failed to save file.', err));
      } else {
        console.log('The file ' + name + ' (' + encoding + ') was saved to ' + path);
      }
    }); 

    function cleanPath(str) {
      if (str) {
        return str.replace(/\.\./g,'').replace(/\/+/g,'').
          replace(/^\/+/,'').replace(/\/+$/,'');
      }
    }
    function cleanName(str) {
      return str.replace(/\.\./g,'').replace(/\//g,'');
    }
  }
});

How to change this code to fs write stream, as it is not perfect for Bigger Uploads?, Can you suggest something?

After looking into different possible solutions to file uploads with Meteor 1.3 and React, I couldn't find a suitable solution. This script helped a great deal. I can upload after a few small tweaks. Of course, for Meteor 1.3 and 1.4, it works without an error after installing fs rather than using fs = Npm.require('fs'):

meteor npm install --save fs

Then, in the server_save_files.js, I added this line on the top:

import fs from 'fs';

Next thing to figure out is: How to implement a progress bar for the upload?

Need to make the following changes to have this working in meteor 1.3

1. import fs from 'fs'; (instead of fs = meteor_bootstrap.require('fs'))
2. Change chroot to chroot = '../../../../../public';
3. In helper function change the ev.srcElement.files to ev.currentTarget.files

Works like a charm after that. Thanks for the tutorial.

code is not working. :(

i am getting error that meteor_bootstrap.require('fs') is not function.

# Thanks alot man #dariocravero

Working.
Without any package.

Thanks

can anyone tell how to create persistence storage in development mode for meteor. Whenever server starts either remove data or give this error
Error: EBUSY: resource busy or locked, rmdir 'C:\Users\admins\Desktop\tripsy\dummy.meteor\local\build\programs\server'
at Error (native)