I am trying to read PDF document properties from nodeJS. I couldn't find any node module for reading document properties. I am able to read the file metadata by using file-metadata but its only giving basic properties. I want to read the properties like Document restriction summary(please check attached image for reference. 
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2 Answers
Inspired by @DietrichvonSeggern's suggestion I wrote small node script.
const { spawnSync } = require('child_process');
const { stdout } = spawnSync('exiftool',
['-b', '-UserAccess', 'test.pdf'],
{ encoding: 'ascii' });
const bits = (parseInt(stdout, 10) || 0b111111111110);
const perms = {
'Print': 1 << 2,
'Modify': 1 << 3,
'Copy': 1 << 4,
'Annotate': 1 << 5,
'Fill forms': 1 << 8,
'Extract': 1 << 9,
'Assemble': 1 << 10,
'Print high-res': 1 << 11
};
Object.keys(perms).forEach((title) => {
const bit = perms[title];
const yesno = (bits & bit) ? 'YES' : 'NO';
console.log(`${title} => ${yesno}`);
});
It will print something like:
Print => YES
Modify => NO
Copy => NO
Annotate => NO
Fill forms => NO
Extract => NO
Assemble => NO
Print high-res => YES
You should have exiftool installed in your system, and add needed error checks to this script.
ExifTool UserAccess tag reference.
Slightly modified:
const perms = {
'Print': 1 << 2,
'Modify': 1 << 3,
'Copy': 1 << 4,
'Annotate': 1 << 5,
'FillForms': 1 << 8,
'Extract': 1 << 9,
'Assemble': 1 << 10,
'PrintHighRes': 1 << 11
};
const access = {};
Object.keys(perms).forEach((perm) => {
const bit = perms[perm];
access[perm] = !!(bits & bit);
});
console.log(access);
Will produce:
{
Print: true,
Modify: false,
Copy: false,
Annotate: false,
FillForms: false,
Extract: false,
Assemble: false,
PrintHighRes: true
}
Comments
Have you considered using exiftool? You would have to integrate it into nodejs, but afaics it provides more or less all data you are looking for.
1 Comment
Styx
That's a really good suggestion.
exiftool can extract UserAccess tag that holds this information.