ExecuteScript - Extract text & metadata from PDF

This post is about using Apache NiFi, its ExecuteScript processor, and Apache PDFBox to extract text and metadata from PDF files. It is similar to a previous post of mine, using Module Path to include JARs. But this is a good use case as well, so I thought I'd write a bit about it. This one will be short and sweet, but the aforementioned post has more details :)

In my example, I'm using the GetFile processor to find all PDFs in a directory. They are sent to an ExecuteScript processor, which uses PDFBox and PDFTextStripper (and other classes) to extract the text into the flowfile content, and adds metadata as attributes. The resulting script is here:

import org.apache.pdfbox.pdmodel.*
import org.apache.pdfbox.util.*

def flowFile = session.get()
if(!flowFile) return

def s = new PDFTextStripper()
def doc, info

flowFile = session.write(flowFile, {inputStream, outputStream ->
 doc = PDDocument.load(inputStream)
 info = doc.getDocumentInformation()
        s.writeText(doc, new OutputStreamWriter(outputStream))
    } as StreamCallback
)
flowFile = session.putAttribute(flowFile, 'pdf.page.count', "${doc.getNumberOfPages()}")
flowFile = session.putAttribute(flowFile, 'pdf.title', "${info.getTitle()}" )
flowFile = session.putAttribute(flowFile, 'pdf.author',"${info.getAuthor()}" );
flowFile = session.putAttribute(flowFile, 'pdf.subject', "${info.getSubject()}" );
flowFile = session.putAttribute(flowFile, 'pdf.keywords', "${info.getKeywords()}" );
flowFile = session.putAttribute(flowFile, 'pdf.creator', "${info.getCreator()}" );
flowFile = session.putAttribute(flowFile, 'pdf.producer', "${info.getProducer()}" );
flowFile = session.putAttribute(flowFile, 'pdf.date.creation', "${info.getCreationDate()}" );
flowFile = session.putAttribute(flowFile, 'pdf.date.modified', "${info.getModificationDate()}");
flowFile = session.putAttribute(flowFile, 'pdf.trapped', "${info.getTrapped()}" );   
session.transfer(flowFile, REL_SUCCESS)

I then put the file's text contents out (using PutFile) and also logged the metadata attributes. The flow looks like this:

The template is available as a Gist (here). Please let me know if you find it useful, and/or if you have comments, questions, or suggestions. Cheers!