file_upload.coffee

@Media = new Meteor.Collection('media')

Media.allow
  insert: (userId, doc) ->
    return userId && (doc.user == userId)

  update: (userId, doc, fields, modifier) ->
      return userId == doc.user

  remove: (userId, doc) ->
    return userId && (doc.user == userId)

Media.deny
  insert: (userId, doc) ->
    doc.createdAt = "#{moment().unix()}"
    return false;
  update: (userId, docs, fields, modifier) ->
    modifier.$set.updatedAt = "#{moment().unix()}"
    return false

decodeBase64Media = (dataString) ->
  matches = dataString.match(/^data:([A-Za-z-+\/]+);base64,(.+)$/)
  response = {}

  if matches.length isnt 3
    return new Error('Invalid input string')

  response.type = matches[1]
  response.data = new Buffer(matches[2], 'base64')

  return response

Meteor.methods
  FileUpload: (values) ->
    if Meteor.isServer
      # NPM requirements
      fs      = Npm.require('fs')
      path    = Npm.require('path')

      console.log('File Upload in progress')

      # Pull out the Base64 data to be stored on disk.
      base64_file = values.file.data
      delete values.file.data

      file = values.file

      _filename = file.name

      # Save the media WITHOUT the data as mongo has a 16MB limit on
      # document sizes.

      _id = Media.findOne({name: _filename})._id

      # Need to get the path that this file is located in.
      basepath = path.resolve('.')

      # It just so happens that the apps root path is six steps up from the base path of THIS file.
      app_root_path = basepath.replace('.meteor/local/build/programs/server','')
      app_root_path = app_root_path.replace('/bundle/programs/public/server','')
      media_dir = path.resolve("#{app_root_path}/../media/#{_id}")

      if fs.existsSync(media_dir) isnt true
        mkdirP.sync(media_dir)

      _filePath = "#{media_dir}/#{_filename}"

      console.log "Media Directory: ", media_dir
      console.log "Application Base Path: ", app_root_path

      file_data = decodeBase64Media(base64_file)

      console.log "Writing: ", _filePath

      fs.writeFileSync(_filePath, file_data.data)
      Media.update({_id: _id}, {$set: {complete: true}})