Add /AFRelationship and /Subtype to embedded files

lib/prawn/attachment.rb

@@ -82,7 +82,9 @@ def prepare_options(name, opts)
         creation_date: opts[:created_at] || Time.now.utc,
         modification_date: opts[:modified_at] || Time.now.utc,
         description: opts[:description],
-        hidden: !!opts[:hidden]
+        hidden: !!opts[:hidden],
+        relationship: opts[:relationship],
+        mime_type: opts[:mime_type]
       }
     end
 

lib/prawn/attachment/embedded_file.rb

@@ -4,7 +4,7 @@ module Prawn
   module Attachment
     # EmbeddedFile represents a file to be embedded in the PDF.
     class EmbeddedFile
-      attr_reader :data, :creation_date, :modification_date, :checksum
+      attr_reader :data, :creation_date, :modification_date, :subtype, :checksum
 
       def initialize(data, options = {})
         @data = data
@@ -15,6 +15,8 @@ def initialize(data, options = {})
         @modification_date = options[:modification_date]
         @modification_date = Time.now.utc unless @modification_date.is_a?(Time)
 
+        @subtype = (options[:mime_type] || "application/octet-stream").to_sym
+
         @checksum = Digest::MD5.digest(data)
       end
 
@@ -35,7 +37,8 @@ def reference_params
             ModDate: modification_date,
             CheckSum: PDF::Core::LiteralString.new(checksum),
             Size: data.length
-          }
+          },
+          Subtype: subtype
         }
       end
     end

lib/prawn/attachment/filespec.rb

@@ -20,6 +20,10 @@ def initialize(file, options = {})
         end
 
         @hidden = options[:hidden]
+
+        if options[:relationship]
+          @relationship = options[:relationship]
+        end
         @file = file
       end
 
@@ -36,12 +40,13 @@ def build_pdf_object(document)
         )
 
         obj.data[:Desc] = description if description
+        obj.data[:AFRelationship] = relationship if relationship
         obj
       end
 
       private
 
-      attr_reader :file, :description
+      attr_reader :file, :description, :relationship
     end
   end
 end