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Download protected PDF file from Google Drive

You can download protected PDF file

  1. // ==UserScript==
  2. // @name         Download protected PDF file from Google Drive
  3. // @namespace    Download protected PDF file
  4. // @description  You can download protected PDF file
  5. // @version      1.1
  6. // @match        https://drive.google.com/*
  7. // @grant        GM_registerMenuCommand
  8. // @require      https://unpkg.com/jspdf@latest/dist/jspdf.umd.min.js
  9. // ==/UserScript==
  10.  
  11. (function() {
  12.     'use strict';
  13.     function rescale(width, height, fitWidth, fitHeight) {
  14.         let ratio = width / height;
  15.         let fitRatio = fitWidth / fitHeight;
  16.         if (ratio <= fitRatio) {
  17.             return [width, width / fitRatio];
  18.         } else {
  19.             return [height * fitRatio, height];
  20.         }
  21.     }
  22.  
  23.     function imageToBase64(img) {
  24.         let canvas = document.createElement("canvas");
  25.         let context = canvas.getContext("2d");
  26.         canvas.width = img.naturalWidth;
  27.         canvas.height = img.naturalHeight;
  28.         context.drawImage(img, 0, 0, img.naturalWidth, img.naturalHeight);
  29.         return canvas.toDataURL("image/png", 1.0);
  30.     }
  31.  
  32.     function downloadPDF() {
  33.         try {
  34.             let jsPDF = window.jspdf.jsPDF;
  35.             let pdf = new jsPDF();
  36.             let pdfWidth = pdf.internal.pageSize.getWidth();
  37.             let pdfHeight = pdf.internal.pageSize.getHeight();
  38.             let elements = document.getElementsByTagName("img");
  39.             for (let img of elements) {
  40.                 if (!/^blob:/.test(img.src)) {
  41.                     continue;
  42.                 }
  43.                 console.log("adding image", img.src);
  44.                 let imgData = imageToBase64(img);
  45.                 let [newWidth, newHeight] = rescale(pdfWidth, pdfHeight, img.naturalWidth, img.naturalHeight);
  46.                 pdf.addImage(imgData, "png", 0, 0, newWidth, newHeight);
  47.                 pdf.addPage();
  48.             }
  49.             pdf.deletePage(pdf.internal.getNumberOfPages());
  50.             pdf.save("download.pdf");
  51.         } catch(e) {
  52.             console.log(e);
  53.         }
  54.     }
  55.  
  56.     GM_registerMenuCommand("Download PDF file", downloadPDF, "d");
  57. })();