How to protect an existing PDF file with password using NodeJS?

Question

How to protect PDF file with a password using nodejs? without using pdfq or any CLI commands, is that possible ?

im generating an html template to pdf using pdf-creator-node. the output of it, i want to protect it with password.

here is the initial code:

const fs = require("fs");
const pdfCreator = require("pdf-creator-node");
const data = require("./utils/data");

// Read the HTML template
const htmlTemplate = fs.readFileSync(
  "./templates/html/template.html",
  "utf8"
);

// Define the options for the PDF generation
const options = {
  format: "A4",
  orientation: "portrait",
};

// Compile the HTML template and generate the PDF
const document = {
  html: htmlTemplate,
  data, // Optional data to pass to the template
  path: "output.pdf", // Specify the output file path
};

pdfCreator
  .create(document, options)
  .then((result) => {
    console.log("PDF created successfully");
  })
  .catch((error) => {
    console.error("Error creating PDF:", error);
  });

no, it's not possible, since pdf-creator-node is just a very light front end to node-html-pdf which uses phantomjs, and that can't do passworded PDF according to stackoverflow.com/questions/33719673/… — Jaromanda X
– Jaromanda X, Commented Jun 26, 2023 at 4:20
well, the question I linked to suggests using node-qpdf ... assuming thats the same thing you specifically don't want to use (i.e. pdfq), then, no, I have no suggestions for another approach — Jaromanda X
– Jaromanda X, Commented Jun 26, 2023 at 5:08

jonathan · Accepted Answer · 2024-04-19 16:19:12Z

0

const coherentpdf = require('coherentpdf');

   public async createPdf(htmlString, password) {
    try {
      const tempPath = '/tmp/result.pdf';
      const tempPdfOutput = '/tmp/PdfOutput.pdf';

      
      const browser = await puppeteer.launch({
        args: chromium.args,
        defaultViewport: chromium.defaultViewport,
        executablePath: await chromium.executablePath(),
        headless: chromium.headless,
        ignoreHTTPSErrors: true
      });

      const page = await browser.newPage();
      await page.setContent(htmlString);
      await page.pdf({ format: 'A4', path: tempPath });


      let pdfe = coherentpdf.fromFile(tempPath, '');
      var permissions = [coherentpdf.noEdit];
      coherentpdf.toFileEncrypted(pdfe, coherentpdf.pdf40bit, permissions, 'owner', password, false, false, tempPdfOutput);

      return tempPath;

    } catch (error) {
      console.error('Error createPdf:', error);
      throw error;
    }
  }

answered Apr 19, 2024 at 16:19

jonathan

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1 Comment

Poor programmer Over a year ago

no temp output, it should be on buffer

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