Unable to get a response while parsing a PDF file that contains image.

[Raju03-git]

While processing a PDF file that contains image then my backend node service fails. I've tried some work arounds, but the service just fails every time. Please help me resolve this issue.

pdfreader version - 1.2.14
Node Version - 16.13.0

Used File - pdfReaderIssue.pdf

Note : I tried with lower version of nodeJs. It's working till version 16.6.2.

[adrienjoly]

In order for us to reproduce and investigate, can you share your PDF file and JS code, please?

[Raju03-git]

Please find the JS code & Sample File.

PDF File -
pdfReaderIssue.pdf

JS Code -

 var buffer = '';
          return new Promise((resolve, reject) => {
              new pdfreader.PdfReader().parseFileItems('sample.pdf', function (err, item) {
                  if (err) {
                      reject(err);
                  } else if (!item) {
                      resolve(buffer);
                  }
                  else if (item.text) buffer += item.text;
              });
          });

[adrienjoly]

Thank you!

I'll try to find some time to test this. In the meantime, anybody can feel free to give it a go!

[adrienjoly]

To investigate, I've tried parsing that file with the parse.js script provided in this repo, after enabling the debug mode:

diff --git a/parse.js b/parse.js
index 02100cb..ab0c9e4 100644
--- a/parse.js
+++ b/parse.js
@@ -2,7 +2,7 @@ var LOG = require("./lib/LOG.js").toggle(false);
 var PdfReader = require("./index.js").PdfReader;
 
 function printRawItems(filename, callback) {
-  new PdfReader().parseFileItems(filename, function (err, item) {
+  new PdfReader({ debug: true }).parseFileItems(filename, function (err, item) {
     if (err) callback(err);
     else if (!item) callback();
     else if (item.file) console.log("file =", item.file.path);

=> Here's what I'm getting:

$ node parse.js '/Users/adrienjoly/Downloads/pdfReaderIssue.pdf'

printing raw items from file: /Users/adrienjoly/Downloads/pdfReaderIssue.pdf ...
file = /Users/adrienjoly/Downloads/pdfReaderIssue.pdf
Warning: Setting up fake worker.
Warning: Unhandled rejection: ReferenceError: MozBlobBuilder is not defined
ReferenceError: MozBlobBuilder is not defined
    at Object.createBlob (eval at <anonymous> (/Users/adrienjoly/dev/adrienjoly/npm-pdfreader/node_modules/pdf2json/lib/pdf.js:64:1), <anonymous>:1104:12)
    at Object.createObjectURL (eval at <anonymous> (/Users/adrienjoly/dev/adrienjoly/npm-pdfreader/node_modules/pdf2json/lib/pdf.js:64:1), <anonymous>:1112:24)
    at JpegStream_getIR [as getIR] (eval at <anonymous> (/Users/adrienjoly/dev/adrienjoly/npm-pdfreader/node_modules/pdf2json/lib/pdf.js:64:1), <anonymous>:25575:18)
    at PartialEvaluator_buildPaintImageXObject [as buildPaintImageXObject] (eval at <anonymous> (/Users/adrienjoly/dev/adrienjoly/npm-pdfreader/node_modules/pdf2json/lib/pdf.js:64:1), <anonymous>:7120:64)
    at PartialEvaluator_getOperatorList [as getOperatorList] (eval at <anonymous> (/Users/adrienjoly/dev/adrienjoly/npm-pdfreader/node_modules/pdf2json/lib/pdf.js:64:1), <anonymous>:7464:24)
    at Object.eval [as onResolve] (eval at <anonymous> (/Users/adrienjoly/dev/adrienjoly/npm-pdfreader/node_modules/pdf2json/lib/pdf.js:64:1), <anonymous>:4348:26)
    at Object.runHandlers (eval at <anonymous> (/Users/adrienjoly/dev/adrienjoly/npm-pdfreader/node_modules/pdf2json/lib/pdf.js:64:1), <anonymous>:864:35)
    at listOnTimeout (node:internal/timers:557:17)
    at processTimers (node:internal/timers:500:7)

This error is referenced on pdf2json's repository, and seems to have been fixed in its latest version, cf modesty/pdf2json#247.

[adrienjoly]

After upgrading pdf2json to version 2.0.0 in package.json, here's what I'm getting:

$ node parse.js '/Users/adrienjoly/Downloads/pdfReaderIssue.pdf'

printing raw items from file: /Users/adrienjoly/Downloads/pdfReaderIssue.pdf ...
file = /Users/adrienjoly/Downloads/pdfReaderIssue.pdf
Warning: Setting up fake worker.
Warning: TT: undefined function: 32
(node:47195) ExperimentalWarning: buffer.Blob is an experimental feature. This feature could change at any time
(Use `node --trace-warnings ...` to show where the warning was created)
page = 1
4.252   14.793          left    29      Sample
6.254   14.793          left    23      check
done.

=> If you want to upgrade that dependency in that project, add the following lines in your package.json then run npm install again:

  "resolutions": {
    "pdf2json": "2.0.0"
  }

Cf #97 (comment)