Update password to password protected file

[atodhruv]

I some PDFs , some of are password protected & some not. I want following task to perform

• check if pdf is password protected then update with new password
• Check PDFs is without password nothing to do.

Can you help me to do this.
IMP. is to update password of password protected PDF.

I used this method to set password

coherentpdf.toFileEncrypted(pdf, coherentpdf.aes256bitisofalse, [coherentpdf.noEdit], password, password, false, false, protected_file_path);

Thanks in advance.

[johnwhitington]

You can:

1. Load each file with fromFile - pass a blank string for user password
2. Check if it's encrypted with isEncrypted
3. If it is, re-write it with toFileEncrypted

[atodhruv]

@johnwhitington Thanks for reply. I tried but, PDF id created with blank pages.

let pdf = await coherentpdf.fromFile(filePath, 'Admin@123');
if(coherentpdf.isEncrypted(pdf)){
let permissions = [coherentpdf.noEdit];
coherentpdf.toFileEncrypted(pdf, coherentpdf.aes256bitisofalse, permissions, "Demo@123", "Demo@123", false, false, newFilePath,);
}

[johnwhitington]

Can you make a standalone example for me to test? i.e

• an input file
• a JavaScript program I can run from node at the command line