Search and Redact PDF on Server/Desktop

1const { PDFNet } = require('@pdftron/pdfnet-node');
2const ApryseLicense = require('../LicenseKey/LicenseKey');
3
4const main = async () => {
5  const pattern = 'features'; // expression to search for
6  const redactText = 'Top Secret'; // text to show in place of redacted content. Can be empty string.
7
8  const doc = await PDFNet.PDFDoc.createFromURL(filename);
9  const txtSearch = await PDFNet.TextSearch.create();
10  const mode = PDFNet.TextSearch.Mode.e_whole_word + PDFNet.TextSearch.Mode.e_highlight; // Use whole word search
11
12  txtSearch.setMode(mode);
13  txtSearch.setPattern(pattern);
14
15  // call Begin() method to initialize the text search.
16  txtSearch.begin(doc, pattern, mode);
17  const redactions = []; // array to hold redaction objects
18  let result;
19  // loop to find all instances of the pattern
20  while ((result = await txtSearch.run()).code === PDFNet.TextSearch.ResultCode.e_found) {
21    // add a redaction object based on the location of the found instance
22    const highlights = result.highlights;
23    await highlights.begin(doc);
24    while (await highlights.hasNext()) {
25      const pageNumber = await highlights.getCurrentPageNumber();
26      const quadArr = await highlights.getCurrentQuads();
27      for (let i = 0; i < quadArr.length; ++i) {
28        const currQuad = quadArr[i];
29        const x1 = Math.min(Math.min(Math.min(currQuad.p1x, currQuad.p2x), currQuad.p3x), currQuad.p4x);
30        const x2 = Math.max(Math.max(Math.max(currQuad.p1x, currQuad.p2x), currQuad.p3x), currQuad.p4x);
31        const y1 = Math.min(Math.min(Math.min(currQuad.p1y, currQuad.p2y), currQuad.p3y), currQuad.p4y);
32        const y2 = Math.max(Math.max(Math.max(currQuad.p1y, currQuad.p2y), currQuad.p3y), currQuad.p4y);
33        redactions.push(await PDFNet.Redactor.redactionCreate(pageNumber, (await PDFNet.Rect.init(x1, y1, x2, y2)), false, redactText));
34      }
35      highlights.next();
36    }
37  }
38  const appearance = {};
39  appearance.redaction_overlay = true;
40  appearance.border = false;
41  appearance.positive_overlay_color = await PDFNet.ColorPt.init(1, 0.2, 0.2, 0); // red
42  appearance.show_redacted_content_regions = true;
43  PDFNet.Redactor.redact(doc, redactions, appearance, false, false);
44  doc.save('textsearch_redacted.pdf', PDFNet.SDFDoc.SaveOptions.e_linearized);
45}
46
47PDFNet.runWithCleanup(main, ApryseLicense.key) // provide your license key here
48  .catch(function (error) {
49    console.log('Error: ' + JSON.stringify(error));
50  })
51  .then(function () {
52    PDFNet.shutdown();
53  });
54