How to download protected/view-only files from google drive? | Use online documents offline

Code:
let jspdf = document.createElement( "script" );
jspdf.onload = function () {
let pdf = new jsPDF();
let elements = document.getElementsByTagName( "img" );
for ( let i in elements) {
let img = elements[i];
if (!/^blob:/.test(img.src)) {
continue ;
}
let canvasElement = document.createElement( 'canvas' );
let con = canvasElement.getContext( "2d" );
canvasElement.width = img.width;
canvasElement.height = img.height;
con.drawImage(img, 0, 0,img.width, img.height);
let imgData = canvasElement.toDataURL( "image/jpeg" , 1.0);
pdf.addImage(imgData, 'JPEG' , 0, 0);
pdf.addPage();
}
pdf.save( "download.pdf" );
};
jspdf.src = 'cdnjs.cloudfla... ;
document.body.appendChild(jspdf);
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