chrome-devtools-frontend/front_end/models/har/Writer.ts

Chrome DevTools UI

// Copyright 2021 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.

/*
 * Copyright (C) 2007, 2008 Apple Inc.  All rights reserved.
 * Copyright (C) 2008, 2009 Anthony Ricaud <rik@webkit.org>
 * 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:
 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  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.
 * 3.  Neither the name of Apple Computer, Inc. ("Apple") 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 APPLE AND ITS 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 APPLE OR ITS 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.
 */

import * as Common from '../../core/common/common.js';
import * as i18n from '../../core/i18n/i18n.js';
import * as Platform from '../../core/platform/platform.js';
import type * as SDK from '../../core/sdk/sdk.js';

import {Log, type EntryDTO} from './Log.js';

const UIStrings = {
  /**
   *@description Title of progress in harwriter of the network panel
   */
  collectingContent: 'Collecting content…',
  /**
   *@description Text to indicate DevTools is writing to a file
   */
  writingFile: 'Writing file…',
};
const str_ = i18n.i18n.registerUIStrings('models/har/Writer.ts', UIStrings);
const i18nString = i18n.i18n.getLocalizedString.bind(undefined, str_);
export class Writer {
  static async write(
      stream: Common.StringOutputStream.OutputStream, requests: SDK.NetworkRequest.NetworkRequest[],
      progress: Common.Progress.Progress): Promise<void> {
    const compositeProgress = new Common.Progress.CompositeProgress(progress);

    const content = await Writer.harStringForRequests(requests, compositeProgress);
    if (progress.isCanceled()) {
      return;
    }
    await Writer.writeToStream(stream, compositeProgress, content);
  }

  static async harStringForRequests(
      requests: SDK.NetworkRequest.NetworkRequest[],
      compositeProgress: Common.Progress.CompositeProgress): Promise<string> {
    const progress = compositeProgress.createSubProgress();
    progress.setTitle(i18nString(UIStrings.collectingContent));
    progress.setTotalWork(requests.length);

    // Sort by issueTime because this is recorded as startedDateTime in HAR logs.
    requests.sort((reqA, reqB) => reqA.issueTime() - reqB.issueTime());
    const harLog = await Log.build(requests);
    const promises = [];
    for (let i = 0; i < requests.length; i++) {
      const promise = requests[i].contentData();
      promises.push(promise.then(contentLoaded.bind(null, harLog.entries[i])));
    }

    await Promise.all(promises);
    progress.done();

    if (progress.isCanceled()) {
      return '';
    }
    return JSON.stringify({log: harLog}, null, jsonIndent);

    function isValidCharacter(codePoint: number): boolean {
      // Excludes non-characters (U+FDD0..U+FDEF, and all codepoints ending in
      // 0xFFFE or 0xFFFF) from the set of valid code points.
      return codePoint < 0xD800 || (codePoint >= 0xE000 && codePoint < 0xFDD0) ||
          (codePoint > 0xFDEF && codePoint <= 0x10FFFF && (codePoint & 0xFFFE) !== 0xFFFE);
    }

    function needsEncoding(content: string): boolean {
      for (let i = 0; i < content.length; i++) {
        if (!isValidCharacter(content.charCodeAt(i))) {
          return true;
        }
      }
      return false;
    }

    function contentLoaded(entry: EntryDTO, contentData: SDK.NetworkRequest.ContentData): void {
      progress.incrementWorked();
      let encoded: true|boolean = contentData.encoded;
      if (contentData.content !== null) {
        let content: string = contentData.content;
        if (content && !encoded && needsEncoding(content)) {
          content = Platform.StringUtilities.toBase64(content);
          encoded = true;
        }
        entry.response.content.text = content;
      }
      if (encoded) {
        entry.response.content.encoding = 'base64';
      }
    }
  }

  static async writeToStream(
      stream: Common.StringOutputStream.OutputStream, compositeProgress: Common.Progress.CompositeProgress,
      fileContent: string): Promise<void> {
    const progress = compositeProgress.createSubProgress();
    progress.setTitle(i18nString(UIStrings.writingFile));
    progress.setTotalWork(fileContent.length);
    for (let i = 0; i < fileContent.length && !progress.isCanceled(); i += chunkSize) {
      const chunk = fileContent.substr(i, chunkSize);
      await stream.write(chunk);
      progress.incrementWorked(chunk.length);
    }
    progress.done();
  }
}

export const jsonIndent = 2;
export const chunkSize = 100000;