gistfile1.coffee

class CORS
  self = this
  constructor: ->
    createCORSRequest = (method, url) ->
      xhr = new XMLHttpRequest()

      if(xhr.withCredentials != 'undefined')
        xhr.open method, url, true
      else if typeof(XDomainRequest) != 'undefined'
        xhr = new XDomainRequest()
        xhr.open method, url
      else
        xhr = null
      xhr

    executeOnSignedUrl = (file, callback) ->
      xhr = new XMLHttpRequest()
      file.type = 'image/jpeg'
      #key = file.name.replace(new RegExp(' ','g'), '_')
      #xhr.open('GET', '/upload/sign?key=test/'+key+'&type='+file.type, true)
      xhr.open('GET', self.opts.url, true)
      xhr.overrideMimeType('text/plain; charset=x-user-defined');
      xhr.onreadystatechange = (e) ->
        if this.readyState == 4 && this.status == 200
          self.opts.remote_url = this.responseText.split('|')[1]
          self.opts.key = this.responseText.split('|')[2]
          self.opts.media_id = this.responseText.split('|')[3]
          callback(this.responseText.split('|')[0])
          #callback(decodeURIComponent(this.responseText))
        else if this.readyState == 4 && this.status != 200
          window.console.log('Could not contact signing script. Status = ' + this.status)
      xhr.send()

    this.uploadFile = (opts) ->
      self.opts = opts
      executeOnSignedUrl self.opts.file, (signedURL) ->
        uploadToS3(self.opts.file, signedURL)

    uploadToS3 = (file, url) ->
      xhr = createCORSRequest('PUT', url)

      if !xhr
        window.console.log('CORS not supported')
      else
        xhr.onload = ->
          if xhr.status == 200
            window.console.log('Upload Completed!')
            self.opts.success(self.opts.file, self.opts)
          else
            window.console.log('Upload error:' + xhr.status)

        xhr.onerror = (error) ->
          window.console.log(error)

        xhr.upload.onprogress = (e) ->
          if e.lengthComputable
            percentLoaded = Math.round((e.loaded / e.total)*100)
            self.opts.progress(percentLoaded)
            #window.console.log(percentLoaded + '%')

        xhr.setRequestHeader('Content-Type', file.type)
        xhr.setRequestHeader('x-amz-acl', 'public-read')
        xhr.send(file)