refactor: move Postal::BounceMessage to app/models/bounce_message

app/models/bounce_message.rb

@@ -0,0 +1,55 @@
+# frozen_string_literal: true
+
+class BounceMessage
+
+  def initialize(server, message)
+    @server = server
+    @message = message
+  end
+
+  def raw_message
+    mail = Mail.new
+    mail.to = @message.mail_from
+    mail.from = "Mail Delivery Service <#{@message.route.description}>"
+    mail.subject = "Mail Delivery Failed (#{@message.subject})"
+    mail.text_part = body
+    mail.attachments["Original Message.eml"] = { mime_type: "message/rfc822", encoding: "quoted-printable", content: @message.raw_message }
+    mail.message_id = "<#{SecureRandom.uuid}@#{Postal.config.dns.return_path}>"
+    mail.to_s
+  end
+
+  def queue
+    message = @server.message_db.new_message
+    message.scope = "outgoing"
+    message.rcpt_to = @message.mail_from
+    message.mail_from = @message.route.description
+    message.domain_id = @message.domain&.id
+    message.raw_message = raw_message
+    message.bounce = true
+    message.bounce_for_id = @message.id
+    message.save
+    message.id
+  end
+
+  def postmaster_address
+    @server.postmaster_address || "postmaster@#{@message.domain&.name || Postal.config.web.host}"
+  end
+
+  private
+
+  def body
+    <<~BODY
+      This is the mail delivery service responsible for delivering mail to #{@message.route.description}.
+
+      The message you've sent cannot be delivered. Your original message is attached to this message.
+
+      For further assistance please contact #{postmaster_address}. Please include the details below to help us identify the issue.
+
+      Message Token: #{@message.token}@#{@server.token}
+      Orginal Message ID: #{@message.message_id}
+      Mail from: #{@message.mail_from}
+      Rcpt To: #{@message.rcpt_to}
+    BODY
+  end
+
+end