pdf.js/web/generic_scripting.js

/* Copyright 2020 Mozilla Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import { getPdfFilenameFromUrl, loadScript } from "pdfjs-lib";

async function docPropertiesLookup(pdfDocument) {
  const url = "",
    baseUrl = url.split("#")[0];
  // eslint-disable-next-line prefer-const
  let { info, metadata, contentDispositionFilename, contentLength } =
    await pdfDocument.getMetadata();

  if (!contentLength) {
    const { length } = await pdfDocument.getDownloadInfo();
    contentLength = length;
  }

  return {
    ...info,
    baseURL: baseUrl,
    filesize: contentLength,
    filename: contentDispositionFilename || getPdfFilenameFromUrl(url),
    metadata: metadata?.getRaw(),
    authors: metadata?.get("dc:creator"),
    numPages: pdfDocument.numPages,
    URL: url,
  };
}

class GenericScripting {
  constructor(sandboxBundleSrc) {
    this._ready = loadScript(
      sandboxBundleSrc,
      /* removeScriptElement = */ true
    ).then(() => {
      return window.pdfjsSandbox.QuickJSSandbox();
    });
  }

  async createSandbox(data) {
    const sandbox = await this._ready;
    sandbox.create(data);
  }

  async dispatchEventInSandbox(event) {
    const sandbox = await this._ready;
    setTimeout(() => sandbox.dispatchEvent(event), 0);
  }

  async destroySandbox() {
    const sandbox = await this._ready;
    sandbox.nukeSandbox();
  }
}

export { docPropertiesLookup, GenericScripting };