Add a printer job queue via the printer plugin

plugins/printer/app/controllers/printer_controller.rb

@@ -0,0 +1,58 @@
+class PrinterController < ApplicationController
+  include Concerns::SendOrderPdf
+  include Tubesock::Hijack
+
+  skip_before_filter :authenticate
+  before_filter :authenticate_printer
+  before_filter -> { require_plugin_enabled FoodsoftPrinter }
+
+  def socket
+    hijack do |tubesock|
+      tubesock.onopen do
+        tubesock.send_data unfinished_jobs
+      end
+
+      tubesock.onmessage do |data|
+        update_job data
+        tubesock.send_data unfinished_jobs
+      end
+    end
+  end
+
+  def show
+    job = PrinterJob.find(params[:id])
+    send_order_pdf job.order, job.document
+  end
+
+  private
+
+  def unfinished_jobs
+    {
+      unfinished_jobs: PrinterJob.pending.map(&:id)
+    }.to_json
+  end
+
+  def update_job(data)
+    json = JSON.parse data, symbolize_names: true
+    job = PrinterJob.unfinished.find_by_id(json[:id])
+    return unless job
+    if json[:state]
+      job.add_update! json[:state], json[:message]
+    end
+    job.finish! if json[:finish]
+  end
+
+  protected
+
+  def bearer_token
+    pattern = /^Bearer /
+    header  = request.headers['Authorization']
+    header.gsub(pattern, '') if header && header.match(pattern)
+  end
+
+  def authenticate_printer
+    return head(:unauthorized) unless bearer_token
+    return head(:forbidden) if bearer_token != FoodsoftConfig[:printer_token]
+  end
+
+end