Parse documents with the yomu gem.

parse_documents.rb

require 'yomu'

filename_or_stream = ARGV[0] # This could also be a tempfile or any object that responds to #read

parsed_document = Yomu.new(filename_or_stream)
metadata = parsed_document.metadata

result = {
  title: metadata['title'],
  created_at: metadata['meta:creation-date'],
  created_at_human: metadata['created'],
  filename: filename,
  metadata: metadata,
  text: parsed_document.text
}

yomu_metadata_example1.rb

{"Content-Type"=>"application/pdf",
 "Creation-Date"=>"2015-08-17T22:29:23Z",
 "X-Parsed-By"=>
  ["org.apache.tika.parser.DefaultParser",
   "org.apache.tika.parser.pdf.PDFParser"],
 "access_permission:assemble_document"=>"true",
 "access_permission:can_modify"=>"true",
 "access_permission:can_print"=>"true",
 "access_permission:can_print_degraded"=>"true",
 "access_permission:extract_content"=>"true",
 "access_permission:extract_for_accessibility"=>"true",
 "access_permission:fill_in_form"=>"true",
 "access_permission:modify_annotations"=>"true",
 "created"=>"Tue Aug 18 00:29:23 CEST 2015",
 "dc:format"=>"application/pdf; version=1.4",
 "dc:title"=>"Jacob | Full Stack Developer & Code Enthusiast",
 "dcterms:created"=>"2015-08-17T22:29:23Z",
 "meta:creation-date"=>"2015-08-17T22:29:23Z",
 "pdf:PDFVersion"=>"1.4",
 "pdf:encrypted"=>"false",
 "producer"=>"wkhtmltopdf",
 "title"=>"Jacob | Full Stack Developer & Code Enthusiast",
 "xmpTPg:NPages"=>"1"}

yomu_metadata_example2.rb

{"Content-Type"=>"application/pdf",
 "X-Parsed-By"=>
  ["org.apache.tika.parser.DefaultParser",
   "org.apache.tika.parser.pdf.PDFParser"],
 "access_permission:assemble_document"=>"true",
 "access_permission:can_modify"=>"true",
 "access_permission:can_print"=>"true",
 "access_permission:can_print_degraded"=>"true",
 "access_permission:extract_content"=>"true",
 "access_permission:extract_for_accessibility"=>"true",
 "access_permission:fill_in_form"=>"true",
 "access_permission:modify_annotations"=>"true",
 "dc:format"=>"application/pdf; version=1.5",
 "pdf:PDFVersion"=>"1.5",
 "pdf:encrypted"=>"false",
 "producer"=>"Skia/PDF m59",
 "xmpTPg:NPages"=>"1"}

yomu_metadata_example3.rb

{
       "Application-Name": "Microsoft Macintosh Word",
       "Application-Version": "15.0000",
       "Author": "Lukas",
       "Character Count": "11503",
       "Character-Count-With-Spaces": "13302",
       "Content-Type": "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
       "Creation-Date": "2017-05-29T16:28:00Z",
       "Last-Author": "Lukas",
       "Last-Modified": "2017-05-29T16:28:00Z",
       "Last-Save-Date": "2017-05-29T16:28:00Z",
       "Line-Count": "95",
       "Page-Count": "8",
       "Paragraph-Count": "26",
       "Revision-Number": "2",
       "Template": "Normal.dotm",
       "Word-Count": "1825",
       "X-Parsed-By": [
           "org.apache.tika.parser.DefaultParser",
           "org.apache.tika.parser.microsoft.ooxml.OOXMLParser"
       ],
       "cp:revision": "2",
       "creator": "Lukas",
       "date": "2017-05-29T16:28:00Z",
       "dc:creator": "Lukas",
       "dc:publisher": "Business",
       "dc:title": "Belgium",
       "dcterms:created": "2017-05-29T16:28:00Z",
       "dcterms:modified": "2017-05-29T16:28:00Z",
       "extended-properties:AppVersion": "15.0000",
       "extended-properties:Application": "Microsoft Macintosh Word",
       "extended-properties:Company": "Business",
       "extended-properties:Template": "Normal.dotm",
       "meta:author": "Lukas",
       "meta:character-count": "11503",
       "meta:character-count-with-spaces": "13302",
       "meta:creation-date": "2017-05-29T16:28:00Z",
       "meta:last-author": "Lukas",
       "meta:line-count": "95",
       "meta:page-count": "8",
       "meta:paragraph-count": "26",
       "meta:save-date": "2017-05-29T16:28:00Z",
       "meta:word-count": "1825",
       "modified": "2017-05-29T16:28:00Z",
       "publisher": "Business",
       "title": "Belgium",
       "xmpTPg:NPages": "8"
   }