enhance MessageGateway to save email as attachment

app/models/message_gateway.rb

@@ -10,13 +10,41 @@ class MessageGateway < ActionMailer::Base
 
     todo_builder = TodoFromRichMessage.new(user, context.id, todo_params[:description], todo_params[:notes])
     todo = todo_builder.construct
-    todo.save!
+
+    if todo.save!
       Rails.logger.info "Saved email as todo for user #{user.login} in context #{context.name}"
+
+      if attach_email_to_todo(todo, email)
+        Rails.logger.info "Saved email as attachment to todo for user #{user.login} in context #{context.name}"
+      end
+    end
     todo
   end
 
   private
 
+  def attach_email_to_todo(todo, email)
+    attachment = todo.attachments.build
+
+    # create temp file
+    tmp = Tempfile.new(['attachment', '.eml'], {universal_newline: true})
+    tmp.write email.raw_source.gsub(/\r/, "")
+
+    # add temp file to attachment. paperclip will copy the file to the right location
+    Rails.logger.info "Saved received email to #{tmp.path}"
+    attachment.file = tmp
+    tmp.close
+    saved = attachment.save!
+
+    # enable write permissions on group, since MessageGateway could be run under different
+    # user than Tracks (i.e. apache versus mail)
+    dir = File.open(File.dirname(attachment.file.path))
+    dir.chmod(0770)
+
+    # delete temp file
+    tmp.unlink
+  end
+
   def get_todo_params(email)
     params = {}
 
@@ -111,5 +139,4 @@ class MessageGateway < ActionMailer::Base
       end
     end
   end
-
 end

test/controllers/message_gateway_test.rb

@@ -83,4 +83,21 @@ class MessageGatewayTest < ActiveSupport::TestCase
     assert_not_nil(invalid_context_todo)
     assert_equal(@inbox, invalid_context_todo.context)
   end
+
+  def test_receiving_email_adds_attachment
+    attachment_count = Attachment.count
+
+    load_message('sample_mms.txt')
+
+    message_todo = Todo.where(:description => "This is the subject").first
+    assert_not_nil(message_todo)
+
+    assert_equal attachment_count+1, Attachment.count
+    assert_equal 1,message_todo.attachments.count
+
+    orig = File.read(File.join(Rails.root, 'test', 'fixtures', 'sample_mms.txt'))
+    attachment = File.read(message_todo.attachments.first.file.path)
+
+    assert_equal orig, attachment
+  end
 end