download pdf view only from google drive

readme.md

Usage

1. Open or Preview Any view-only or protected files from google drive.

2. Open Developer Console.

   If you are previewing in Google Chrome or Firefox

   Press Shift + Ctrl + J ( on Windows / Linux) or Option + ⌘ + J (on Mac)

   If you are previewing in Microsoft Edge Press Shift + Ctrl + I

   If you are previewing in Apple Safari

   Press Option + ⌘ + C

Then you will find yourself inside the developer tools.

3. Navigate to the Console tab.

4. Paste below code and press Enter

Reference

• https://github.com/zeltox/Google-Drive-PDF-Downloader

Google-Drive-PDF-Downloader.js

let res = document.createElement("script");
res.src = 'https://cdnjs.cloudflare.com/ajax/libs/jspdf/1.5.3/jspdf.debug.js';
document.body.appendChild(res);
res.onload = function () {
    const pdf = new jsPDF();
    const added_images = [];
    const added_pages = [];
    const images = [];
    // var loopCounter = 0;
    let allElements = document.querySelectorAll("*");
    var chosenElement;
    var total_pages;
    var timestamp = new Date().getTime();
    const regex = /(?<current_page>\d+)\s\/\s(?<total_pages>\d+)$/;
    let heightOfScrollableElement = 0;
    for (let i = 0; i < allElements.length; i++) {
        if (allElements[i].scrollHeight >= allElements[i].clientHeight) {
            if (heightOfScrollableElement < allElements[i].scrollHeight) {
                heightOfScrollableElement = allElements[i].scrollHeight;
                chosenElement = allElements[i];
            }
        }
    }

    function addImage(img) {
        let result = img.alt.match(regex);
        if (result) {
            var current_page = parseInt(result.groups.current_page);
            if (total_pages === undefined) {
                total_pages = parseInt(result.groups.total_pages);
                console.log("Total page ", total_pages);
            }
        } else {
            return;
        }
        if (added_pages.includes(current_page) || added_images.includes(img.src)) {
            return;
        }
        if (!/^blob:/.test(img.src)) {
            console.log("invalid src");
            return;
        }
        images[current_page] = img;
        added_images.push(img.src);
        added_pages.push(current_page);
        console.log("added page ", current_page);
    }

    function rawPdf() {
        images.forEach((img, index) => {
            let can = document.createElement('canvas');
            let con = can.getContext("2d");
            can.width = img.width;
            can.height = img.height;
            con.drawImage(img, 0, 0);
            let imgData = can.toDataURL("image/jpeg", 1.0);
            pdf.addImage(imgData, 'JPEG', 0, 0);
            pdf.addPage();
        });
        pdf.save(timestamp + ".pdf");
    }

    function generatePDF(remainingHeightToScroll, scrollToLocation) {
        if (total_pages !== undefined && added_images.length >= total_pages) {
            rawPdf();
            return;
        }

        let scrollDistance = chosenElement.clientHeight;
        let img = chosenElement.querySelectorAll("img");
        for (let i = 0; i < img.length; i++) {
            addImage(img[i]);
        }

        setTimeout(function () {
            if (remainingHeightToScroll === 0) {
                scrollToLocation = scrollDistance;
                chosenElement.scrollTo(0, scrollToLocation);
                remainingHeightToScroll = chosenElement.scrollHeight - scrollDistance;
            } else {
                scrollToLocation = scrollToLocation + scrollDistance;
                chosenElement.scrollTo(0, scrollToLocation);
                remainingHeightToScroll = remainingHeightToScroll - scrollDistance;
            }
            if (remainingHeightToScroll >= chosenElement.clientHeight) {
                generatePDF(remainingHeightToScroll, scrollToLocation)
            } else {
                rawPdf();
            }
        }, 100)
    }

    generatePDF(0, 0);
}