From 578e929e0d66782ea85fdd259c8476ce32e3c5f9 Mon Sep 17 00:00:00 2001
From: Patrick Gansterer <paroga@paroga.com>
Date: Sat, 19 Aug 2017 16:24:02 +0200
Subject: [PATCH] Add handling for bounce mails

---
 app/mail_receivers/bounce_mail_receiver.rb | 17 +++++++++++++++++
 app/mailers/mailer.rb                      |  6 ++++++
 config/initializers/mail_receiver.rb       |  1 +
 3 files changed, 24 insertions(+)
 create mode 100644 app/mail_receivers/bounce_mail_receiver.rb
 create mode 100644 config/initializers/mail_receiver.rb

diff --git a/app/mail_receivers/bounce_mail_receiver.rb b/app/mail_receivers/bounce_mail_receiver.rb
new file mode 100644
index 00000000..73da529b
--- /dev/null
+++ b/app/mail_receivers/bounce_mail_receiver.rb
@@ -0,0 +1,17 @@
+class BounceMailReceiver
+
+  def self.regexp
+    /bounce\+(?<local>.*)=(?<domain>[^=]+)/
+  end
+
+  def received(match, data)
+    address = "#{match[:local]}@#{match[:domain]}"
+    mail = Mail.new data
+    subject = mail.subject || 'Unknown bounce error'
+    MailDeliveryStatus.create email: address,
+                              message: subject,
+                              attachment_mime: 'message/rfc822',
+                              attachment_data: data
+  end
+
+end
diff --git a/app/mailers/mailer.rb b/app/mailers/mailer.rb
index ad5aebcd..0ff7053b 100644
--- a/app/mailers/mailer.rb
+++ b/app/mailers/mailer.rb
@@ -89,6 +89,12 @@ class Mailer < ActionMailer::Base
       args[k] = "#{show_user user} <#{user.email}>" if user.is_a? User
     end
 
+    reply_email_domain = FoodsoftConfig[:reply_email_domain]
+    if reply_email_domain && !args[:return_path]
+      address = Mail::Parsers::AddressListsParser.new.parse(args[:to]).addresses.first
+      args[:return_path] = "<#{FoodsoftConfig.scope}.bounce+#{address.local}=#{address.domain}@#{reply_email_domain}>"
+    end
+
     super
   end
 
diff --git a/config/initializers/mail_receiver.rb b/config/initializers/mail_receiver.rb
new file mode 100644
index 00000000..67288cc1
--- /dev/null
+++ b/config/initializers/mail_receiver.rb
@@ -0,0 +1 @@
+FoodsoftMailReceiver.register BounceMailReceiver