substance/model/DefaultFileProxy.js

Substance is a JavaScript library for web-based content editing. It provides building blocks for realizing custom text editors and web-based publishing systems.

import FileProxy from './FileProxy'

/*
  Generic implementation of a file proxy that works with
  any file type
*/
class DefaultFileProxy extends FileProxy {

  constructor(fileNode, context) {
    super(fileNode, context)

    // used locally e.g. after drop or file dialog
    this.file = fileNode.sourceFile
    if (this.file) {
      this._fileUrl = URL.createObjectURL(this.file)
    }
    this.url = fileNode.url
  }

  getUrl() {
    // if we have fetched the url already, just serve it here
    if (this.url) {
      return this.url
    }
    // if we have a local file, use it's data URL
    if (this._fileUrl) {
      return this._fileUrl
    }
    // no URL available
    return ''
  }

  sync() {
    if (!this.url) {
      console.info('Simulating file upload. Creating blob url instead.', this._fileUrl)
      this.url = this._fileUrl
    }
    return Promise.resolve()
  }
}

export default DefaultFileProxy