// ==UserScript==
// @name         Download protected PDF file from Google Drive
// @namespace    Download protected PDF file
// @description  You can download protected PDF file
// @version      1.1
// @match        https://drive.google.com/*
// @grant        GM_registerMenuCommand
// @require      https://unpkg.com/jspdf@latest/dist/jspdf.umd.min.js
// ==/UserScript==
(function() {
'use strict';
function rescale(width, height, fitWidth, fitHeight) {
let ratio = width / height;
let fitRatio = fitWidth / fitHeight;
if (ratio <= fitRatio) {
return [width, width / fitRatio];
} else {
return [height * fitRatio, height];
}
}
function imageToBase64(img) {
let canvas = document.createElement("canvas");
let context = canvas.getContext("2d");
canvas.width = img.naturalWidth;
canvas.height = img.naturalHeight;
context.drawImage(img, 0, 0, img.naturalWidth, img.naturalHeight);
return canvas.toDataURL("image/png", 1.0);
}
function downloadPDF() {
try {
let jsPDF = window.jspdf.jsPDF;
let pdf = new jsPDF();
let pdfWidth = pdf.internal.pageSize.getWidth();
let pdfHeight = pdf.internal.pageSize.getHeight();
let elements = document.getElementsByTagName("img");
for (let img of elements) {
if (!/^blob:/.test(img.src)) {
continue;
}
console.log("adding image", img.src);
let imgData = imageToBase64(img);
let [newWidth, newHeight] = rescale(pdfWidth, pdfHeight, img.naturalWidth, img.naturalHeight);
pdf.addImage(imgData, "png", 0, 0, newWidth, newHeight);
pdf.addPage();
}
pdf.deletePage(pdf.internal.getNumberOfPages());
pdf.save("download.pdf");
} catch(e) {
console.log(e);
}
}
GM_registerMenuCommand("Download PDF file", downloadPDF, "d");
})();