How to get producer of a PDF in google app script

Question

I am trying to write a gmail add-on where I iterate over all emails and create a report based on their producers. Iterating over emails is the easiest part and I have done that, however I can't find any way to get producer line of each PDFs. So far I tried

• analyzing the blob, however this is something like writing a PDF library to parse all syntax. producer tag is not clearly present
• adding pdf.js, which is a third party open source tool to extract such information. However, I couldn't add it due to ES3 - ES6 support issue.

What's the best way to get the producer line of a PDF in google app script?

Thank you

Answer 1

• You want to retrieve the value of Producer from PDF file.

I could understand like above. If my understanding is correct, how about this sample script? In this sample script, from your shared PDF files, the value of Producer is retrieved by 2 regular expressions from the file content. Please think of this as one of several answers.

Sample script:

When you use this script, please set the folder ID of folder that PDF files are put. This script retrieves the value from all PDF files in a folder.

var folderId = "### folderId ###";
var files = DriveApp.getFolderById(folderId).getFilesByType(MimeType.PDF);
var regex = [/Producer\((\w.+)\)/i, /<pdf:Producer>(\w.+)<\/pdf:Producer>/i];
var result = [];
while (files.hasNext()) {
  var file = files.next();
  var content = file.getBlob().getDataAsString();
  var r = regex.reduce(function(s, e) {
    var m = content.match(e);
    if (Array.isArray(m)) s = m[1];
    return s;
  }, "");
  result.push({
    fileName: file.getName(),
    fileId: file.getId(),
    vaueOfProducer: r,
  });
}
Logger.log(result); // Result

Result:

This sample result was retrieved from a folder (my Google Drive) that the shared 3 PDF files were put.

[
  {
    "fileName": "2348706469653861032.pdf",
    "fileId": "###",
    "vaueOfProducer": "iText� 7.1.5 �2000-2019 iText Group NV \(iText; licensed version\)"
  },
  {
    "fileName": "Getting started with OneDrive.pdf",
    "fileId": "###",
    "vaueOfProducer": "Adobe PDF library 15.00"
  },
  {
    "fileName": "DITO-Salesflow-040419-1359-46.pdf",
    "fileId": "###",
    "vaueOfProducer": "iText 2.1.7 by 1T3XT"
  }
]

Note:

• About the file of 2348706469653861032.pdf, the characters which cannot be displayed are included in the value of Producer.
• This is a sample script. So please modify this for your situation.