text: /*
   * Copyright (C) 2011 Google Inc. All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are
   * met:
   *
   *     * Redistributions of source code must retain the above copyright
   * notice, this list of conditions and the following disclaimer.
   *     * Redistributions in binary form must reproduce the above
   * copyright notice, this list of conditions and the following disclaimer
   * in the documentation and/or other materials provided with the
   * distribution.
   *     * Neither the name of Google Inc. nor the names of its
   * contributors may be used to endorse or promote products derived from
   * this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  Network.RequestPreviewView = class extends Network.RequestResponseView {
    /**
     * @param {!SDK.NetworkRequest} request
     */
    constructor(request) {
      super(request);
    }
  
    /**
     * @override
     * @protected
     * @return {!Promise<!UI.Widget>}
     */
    async showPreview() {
      const view = await super.showPreview();
      if (!(view instanceof UI.SimpleView))
        return view;
      const toolbar = new UI.Toolbar('network-item-preview-toolbar', this.element);
      for (const item of view.syncToolbarItems())
        toolbar.appendToolbarItem(item);
      return view;
    }
  
    /**
     * @return {!Promise<?UI.Widget>}
     */
    async _htmlPreview() {
      const contentData = await this.request.contentData();
      if (contentData.error)
        return new UI.EmptyWidget(Common.UIString('Failed to load response data'));
  
      const whitelist = new Set(['text/html', 'text/plain', 'application/xhtml+xml']);
      if (!whitelist.has(this.request.mimeType))
        return null;
  
      // http://crbug.com/767393 - DevTools should recognize JSON regardless of the content type
      const jsonView = await SourceFrame.JSONView.createView(contentData.content);
      if (jsonView)
        return jsonView;
  
      const dataURL = Common.ContentProvider.contentAsDataURL(
          contentData.content, this.request.mimeType, contentData.encoded, contentData.encoded ? 'utf-8' : null);
      return dataURL ? new Network.RequestHTMLView(dataURL) : null;
    }
  
    /**
     * @override
     * @protected
     * @return {!Promise<!UI.Widget>}
     */
    async createPreview() {
      if (this.request.signedExchangeInfo())
        return new Network.SignedExchangeInfoView(this.request);
  
      const htmlErrorPreview = await this._htmlPreview();
      if (htmlErrorPreview)
        return htmlErrorPreview;
  
      // Try provider before the source view - so JSON and XML are not shown in generic editor
      const provided = await SourceFrame.PreviewFactory.createPreview(this.request, this.request.mimeType);
      if (provided)
        return provided;
  
      const sourceView = await Network.RequestResponseView.sourceViewForRequest(this.request);
      if (sourceView)
        return sourceView;
      return new UI.EmptyWidget(Common.UIString('Preview not available'));
    }
  };
  