require 'open-uri' require 'hypdf' module Agents class PdfInfoAgent < Agent gem_dependency_check { defined?(HyPDF) } cannot_be_scheduled! no_bulk_receive! description <<-MD The PDF Info Agent returns the metadata contained within a given PDF file, using HyPDF. #{'## Include the `hypdf` gem in your `Gemfile` to use PDFInfo Agents.' if dependencies_missing?} In order for this agent to work, you need to have [HyPDF](https://devcenter.heroku.com/articles/hypdf) running and configured. It works by acting on events that contain a key `url` in their payload, and runs the [pdfinfo](https://devcenter.heroku.com/articles/hypdf#pdfinfo) command on them. MD event_description <<-MD This will change based on the metadata in the pdf. { "Title"=>"Everyday Rails Testing with RSpec", "Author"=>"Aaron Sumner", "Creator"=>"LaTeX with hyperref package", "Producer"=>"xdvipdfmx (0.7.8)", "CreationDate"=>"Fri Aug 2 05", "32"=>"50 2013", "Tagged"=>"no", "Pages"=>"150", "Encrypted"=>"no", "Page size"=>"612 x 792 pts (letter)", "Optimized"=>"no", "PDF version"=>"1.5", "url": "your url" } MD def working? !recent_error_logs? end def default_options {} end def receive(incoming_events) incoming_events.each do |event| interpolate_with(event) do url_to_scrape = event.payload['url'] check_url(url_to_scrape, event.payload) if url_to_scrape =~ /^https?:\/\//i end end end def check_url(in_url, payload) return unless in_url.present? Array(in_url).each do |url| log "Fetching #{url}" info = HyPDF.pdfinfo(open(url)) create_event :payload => info.merge(payload) end end end end