src/CDN.js

// All external libs URLs should be injected through this class.
// CDN libs URLs are accessible throuh CDN object properties
// like Formio.cdn.ace === 'http://cdn.form.io/ace/1.4.12'.
// For latest version use empty string
class CDN {
  constructor(baseUrl) {
    this.baseUrl = baseUrl || 'https://cdn.form.io';
    this.overrides = {};
    this.libs = {
      'js': '',
      'ace': '1.4.12',
      'bootstrap': '4.6.2',
      'ckeditor': '19.0.0',
      'flatpickr': '4.6.8',
      'flatpickr-formio': '4.6.13-formio.3',
      'font-awesome': '4.7.0',
      'grid': 'latest',
      'moment-timezone': 'latest',
      'quill': '2.0.0-dev.3',
      'shortcut-buttons-flatpickr': '0.4.0',
      'uswds': '2.4.8',
      'core': ''
    };
    this.updateUrls();
  }

  getVersion(lib) {
    return this.libs[lib];
  }

  // Sets a specific library version
  setVersion(lib, version) {
    this.libs[lib] = version;
    this.updateUrls();
  }

  // Sets base CDN url for all libraries
  setBaseUrl(url) {
    this.baseUrl = url;
    this.updateUrls();
  }

  // Allows to override CDN url for a specific library
  setOverrideUrl(lib, url) {
    this.overrides[lib] = url;
    this.updateUrls();
  }

  // Removes override for a specific library
  removeOverride(lib) {
    delete this.overrides[lib];
    this.updateUrls();
  }

  // Removes all overrides
  removeOverrides() {
    this.overrides = {};
    this.updateUrls();
  }

  buildUrl(cdnUrl, lib, version) {
    let url;
    if (version === 'latest' || version === '') {
      url = `${cdnUrl}/${lib}`;
    }
    else {
      url = `${cdnUrl}/${lib}/${version}`;
    }
    return url;
  }

  updateUrls() {
    for (const lib in this.libs) {
      if (lib in this.overrides) {
        this[lib] = this.buildUrl(this.overrides[lib], lib, this.libs[lib]);
      }
      else {
        this[lib] = this.buildUrl(this.baseUrl, lib, this.libs[lib]);
      }
    }
  }
}

export default CDN;