front_end/panels/lighthouse/LighthouseReportRenderer.ts

// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import * as Common from '../../core/common/common.js';
import * as Host from '../../core/host/host.js';
import * as i18n from '../../core/i18n/i18n.js';
import * as Platform from '../../core/platform/platform.js';
import * as SDK from '../../core/sdk/sdk.js';
import * as Workspace from '../../models/workspace/workspace.js';
import * as LighthouseReport from '../../third_party/lighthouse/report/report.js';
import * as Components from '../../ui/legacy/components/utils/utils.js';
import * as UI from '../../ui/legacy/legacy.js';
import * as ThemeSupport from '../../ui/legacy/theme_support/theme_support.js';
import * as Timeline from '../timeline/timeline.js';
import type {RunnerResultArtifacts, NodeDetailsJSON, SourceLocationDetailsJSON} from './LighthouseReporterTypes.js';

const UIStrings = {
  /**
  *@description Label for view trace button when simulated throttling is enabled
  */
  viewOriginalTrace: 'View Original Trace',
  /**
  *@description Text of the timeline button in Lighthouse Report Renderer
  */
  viewTrace: 'View Trace',
  /**
  *@description Help text for 'View Trace' button
  */
  thePerformanceMetricsAboveAre:
      'The performance metrics above are simulated and won\'t match the timings found in this trace. Disable simulated throttling in "Lighthouse Settings" if you want the timings to match.',
};
const str_ = i18n.i18n.registerUIStrings('panels/lighthouse/LighthouseReportRenderer.ts', UIStrings);
const i18nString = i18n.i18n.getLocalizedString.bind(undefined, str_);
const MaxLengthForLinks = 40;

export class LighthouseReportRenderer extends LighthouseReport.ReportRenderer {
  constructor(dom: LighthouseReport.DOM) {
    super(dom);
  }

  static addViewTraceButton(
      el: Element, reportUIFeatures: LighthouseReport.ReportUIFeatures, artifacts?: RunnerResultArtifacts): void {
    if (!artifacts || !artifacts.traces || !artifacts.traces.defaultPass) {
      return;
    }

    const simulated = artifacts.settings.throttlingMethod === 'simulate';
    const container = el.querySelector('.lh-audit-group');
    if (!container) {
      return;
    }

    const defaultPassTrace = artifacts.traces.defaultPass;
    const text = simulated ? i18nString(UIStrings.viewOriginalTrace) : i18nString(UIStrings.viewTrace);
    const timelineButton = reportUIFeatures.addButton({
      text,
      onClick: onViewTraceClick,
    });
    if (timelineButton) {
      timelineButton.classList.add('lh-button--trace');
      if (simulated) {
        UI.Tooltip.Tooltip.install(timelineButton, i18nString(UIStrings.thePerformanceMetricsAboveAre));
      }
    }

    async function onViewTraceClick(): Promise<void> {
      Host.userMetrics.actionTaken(Host.UserMetrics.Action.LighthouseViewTrace);
      await UI.InspectorView.InspectorView.instance().showPanel('timeline');
      Timeline.TimelinePanel.TimelinePanel.instance().loadFromEvents(defaultPassTrace.traceEvents);
    }
  }

  static async linkifyNodeDetails(el: Element): Promise<void> {
    const mainTarget = SDK.TargetManager.TargetManager.instance().mainTarget();
    if (!mainTarget) {
      return;
    }
    const domModel = mainTarget.model(SDK.DOMModel.DOMModel);
    if (!domModel) {
      return;
    }

    for (const origElement of el.getElementsByClassName('lh-node')) {
      const origHTMLElement = origElement as HTMLElement;
      const detailsItem = origHTMLElement.dataset as unknown as NodeDetailsJSON;
      if (!detailsItem.path) {
        continue;
      }

      const nodeId = await domModel.pushNodeByPathToFrontend(detailsItem.path);

      if (!nodeId) {
        continue;
      }
      const node = domModel.nodeForId(nodeId);
      if (!node) {
        continue;
      }

      const element = await Common.Linkifier.Linkifier.linkify(
          node, {tooltip: detailsItem.snippet, preventKeyboardFocus: undefined});
      UI.Tooltip.Tooltip.install(origHTMLElement, '');

      const screenshotElement = origHTMLElement.querySelector('.lh-element-screenshot');
      origHTMLElement.textContent = '';
      if (screenshotElement) {
        origHTMLElement.append(screenshotElement);
      }
      origHTMLElement.appendChild(element);
    }
  }

  static async linkifySourceLocationDetails(el: Element): Promise<void> {
    for (const origElement of el.getElementsByClassName('lh-source-location')) {
      const origHTMLElement = origElement as HTMLElement;
      const detailsItem = origHTMLElement.dataset as SourceLocationDetailsJSON;
      if (!detailsItem.sourceUrl || !detailsItem.sourceLine || !detailsItem.sourceColumn) {
        continue;
      }
      const url = detailsItem.sourceUrl;
      const line = Number(detailsItem.sourceLine);
      const column = Number(detailsItem.sourceColumn);
      const element = await Components.Linkifier.Linkifier.linkifyURL(url, {
        lineNumber: line,
        columnNumber: column,
        showColumnNumber: false,
        inlineFrameIndex: 0,
        maxLength: MaxLengthForLinks,
      });
      UI.Tooltip.Tooltip.install(origHTMLElement, '');
      origHTMLElement.textContent = '';
      origHTMLElement.appendChild(element);
    }
  }

  static handleDarkMode(el: Element): void {
    const updateDarkModeIfNecessary = (): void => {
      el.classList.toggle('lh-dark', ThemeSupport.ThemeSupport.instance().themeName() === 'dark');
    };
    ThemeSupport.ThemeSupport.instance().addEventListener(
        ThemeSupport.ThemeChangeEvent.eventName, updateDarkModeIfNecessary);
    updateDarkModeIfNecessary();
  }
}

// @ts-ignore https://github.com/GoogleChrome/lighthouse/issues/11628
export class LighthouseReportUIFeatures extends LighthouseReport.ReportUIFeatures {
  private beforePrint: (() => void)|null;
  private afterPrint: (() => void)|null;

  constructor(dom: LighthouseReport.DOM) {
    super(dom);
    this.beforePrint = null;
    this.afterPrint = null;
    this._topbar._print = this._print.bind(this);
  }

  setBeforePrint(beforePrint: (() => void)|null): void {
    this.beforePrint = beforePrint;
  }

  setAfterPrint(afterPrint: (() => void)|null): void {
    this.afterPrint = afterPrint;
  }

  /**
   * Returns the html that recreates this report.
   */
  getReportHtml(): string {
    this.resetUIState();
    // @ts-expect-error https://github.com/GoogleChrome/lighthouse/issues/11628
    return Lighthouse.ReportGenerator.generateReportHtml(this.json);
  }

  /**
   * Downloads a file (blob) using the system dialog prompt.
   */
  // This implements the interface ReportUIFeatures from lighthouse
  // which follows a different naming convention.
  // eslint-disable-next-line rulesdir/no_underscored_properties, @typescript-eslint/naming-convention
  async _saveFile(blob: Blob|File): Promise<void> {
    const domain = new Common.ParsedURL.ParsedURL(this.json.finalUrl).domain();
    const sanitizedDomain = domain.replace(/[^a-z0-9.-]+/gi, '_');
    const timestamp = Platform.DateUtilities.toISO8601Compact(new Date(this.json.fetchTime));
    const ext = blob.type.match('json') ? '.json' : '.html';
    const basename = `${sanitizedDomain}-${timestamp}${ext}`;
    const text = await blob.text();
    void Workspace.FileManager.FileManager.instance().save(basename, text, true /* forceSaveAs */);
  }

  // This implements the interface ReportUIFeatures from lighthouse
  // which follows a different naming convention.
  // eslint-disable-next-line rulesdir/no_underscored_properties, @typescript-eslint/naming-convention
  async _print(): Promise<void> {
    const document = this.getDocument();
    const clonedReport = (document.querySelector('.lh-root') as HTMLElement).cloneNode(true);
    const printWindow = window.open('', '_blank', 'channelmode=1,status=1,resizable=1');
    if (!printWindow) {
      return;
    }

    printWindow.document.body.replaceWith(clonedReport);
    // Linkified nodes are shadow elements, which aren't exposed via `cloneNode`.
    await LighthouseReportRenderer.linkifyNodeDetails(clonedReport as HTMLElement);

    if (this.beforePrint) {
      this.beforePrint();
    }
    printWindow.focus();
    printWindow.print();
    printWindow.close();
    if (this.afterPrint) {
      this.afterPrint();
    }
  }

  getDocument(): Document {
    return this._dom.document();
  }

  resetUIState(): void {
    this._resetUIState();
  }
}