index.js

class ImgurUploader {
  constructor(loader, options) {
    // The file loader instance to use during the upload.
    this.loader = loader
    this.clientID = options.clientID
  }

  // Starts the upload process.
  upload() {
    return this.loader.file.then(
      file =>
        new Promise((resolve, reject) => {
          this._initRequest()
          this._initListeners(resolve, reject, file)
          this._sendRequest(file)
        })
    )
  }

  // Aborts the upload process.
  abort() {
    if (this.xhr) {
      this.xhr.abort()
    }
  }

  // Initializes the XMLHttpRequest object using the URL passed to the constructor.
  _initRequest() {
    const xhr = (this.xhr = new XMLHttpRequest())

    // Note that your request may look different. It is up to you and your editor
    // integration to choose the right communication channel. This example uses
    // a POST request with JSON as a data structure but your configuration
    // could be different.
    xhr.open('POST', 'https://api.imgur.com/3/image', true)
    xhr.setRequestHeader('Authorization', `Client-ID ${this.clientID}`)
    xhr.responseType = 'json'
  }

  // Initializes XMLHttpRequest listeners.
  _initListeners(resolve, reject, file) {
    const xhr = this.xhr
    const loader = this.loader
    const genericErrorText = `Couldn't upload file: ${file.name}.`

    xhr.addEventListener('error', () => reject(genericErrorText))
    xhr.addEventListener('abort', () => reject())
    xhr.addEventListener('load', () => {
      const response = xhr.response

      // This example assumes the XHR server's "response" object will come with
      // an "error" which has its own "message" that can be passed to reject()
      // in the upload promise.
      //
      // Your integration may handle upload errors in a different way so make sure
      // it is done properly. The reject() function must be called when the upload fails.
      if (!response || response.error) {
        return reject(
          response && response.error ? response.error.message : genericErrorText
        )
      }

      // If the upload is successful, resolve the upload promise with an object containing
      // at least the "default" URL, pointing to the image on the server.
      // This URL will be used to display the image in the content. Learn more in the
      // UploadAdapter#upload documentation.
      resolve({
        default: response.data.link
      })
    })

    // Upload progress when it is supported. The file loader has the #uploadTotal and #uploaded
    // properties which are used e.g. to display the upload progress bar in the editor
    // user interface.
    if (xhr.upload) {
      xhr.upload.addEventListener('progress', evt => {
        if (evt.lengthComputable) {
          loader.uploadTotal = evt.total
          loader.uploaded = evt.loaded
        }
      })
    }
  }

  // Prepares the data and sends the request.
  _sendRequest(file) {
    // Prepare the form data.
    const data = new FormData()

    data.append('image', file)

    // Important note: This is the right place to implement security mechanisms
    // like authentication and CSRF protection. For instance, you can use
    // XMLHttpRequest.setRequestHeader() to set the request headers containing
    // the CSRF token generated earlier by your application.

    // Send the request.
    this.xhr.send(data)
  }
}

function ImgurUploaderPlugin(editor) {
  editor.plugins.get('FileRepository').createUploadAdapter = loader => {
    return new ImgurUploader(loader, ImgurUploaderPlugin.prototype.options)
  }
}

function init(options) {
  if (!options.clientID) {
    throw new Error('Imgur ClientID was not provided.')
  }
  ImgurUploaderPlugin.prototype.options = options
  return ImgurUploaderPlugin
}

module.exports = init