From d14f54b0e085128b5305c806a4fe01f07b97b8fa Mon Sep 17 00:00:00 2001
From: David Heinemeier Hansson <david@loudthinking.com>
Date: Thu, 20 Sep 2018 17:16:19 -0700
Subject: Expand router with real routing object and 4-way address options

---
 lib/action_mailroom/router.rb       | 22 ++++++++++++++++++----
 lib/action_mailroom/router/route.rb | 26 ++++++++++++++++++++++++++
 lib/action_mailroom/test_helper.rb  |  2 ++
 3 files changed, 46 insertions(+), 4 deletions(-)
 create mode 100644 lib/action_mailroom/router/route.rb

(limited to 'lib')

diff --git a/lib/action_mailroom/router.rb b/lib/action_mailroom/router.rb
index bf0001f1ae..c3fa183438 100644
--- a/lib/action_mailroom/router.rb
+++ b/lib/action_mailroom/router.rb
@@ -1,20 +1,34 @@
 class ActionMailroom::Router
+  class RoutingError < StandardError; end
+
   def initialize
-    @routes = {}
+    @routes = []
   end
 
   def add_routes(routes)
-    @routes.merge!(routes)
+    routes.each do |(address, mailbox_name)|
+      add_route address, to: mailbox_name
+    end
+  end
+
+  def add_route(address, to:)
+    routes.append Route.new(address, to: to)
   end
 
   def route(inbound_email)
-    locate_mailbox(inbound_email).receive(inbound_email)
+    if mailbox = locate_mailbox(inbound_email)
+      mailbox.receive(inbound_email)
+    else
+      raise RoutingError
+    end
   end
 
   private
     attr_reader :routes
 
     def locate_mailbox(inbound_email)
-      "#{routes[inbound_email.mail.to.first].to_s.capitalize}Mailbox".constantize
+      routes.detect { |route| route.match?(inbound_email) }.try(:mailbox_class)
     end
 end
+
+require "action_mailroom/router/route"
diff --git a/lib/action_mailroom/router/route.rb b/lib/action_mailroom/router/route.rb
new file mode 100644
index 0000000000..316c77d711
--- /dev/null
+++ b/lib/action_mailroom/router/route.rb
@@ -0,0 +1,26 @@
+class ActionMailroom::Router::Route
+  class InvalidAddressError < StandardError; end
+
+  attr_reader :address, :mailbox_name
+
+  def initialize(address, to:)
+    @address, @mailbox_name = address, to
+  end
+
+  def match?(inbound_email)
+    case address
+    when String
+      inbound_email.mail.to.include?(address)
+    when Regexp
+      inbound_email.mail.to.detect { |recipient| address.match?(recipient) }
+    when Proc
+      address.call(inbound_email)
+    else
+      address.try(:match?, inbound_email) || raise(InvalidAddressError)
+    end
+  end
+
+  def mailbox_class
+    "#{mailbox_name.to_s.capitalize}Mailbox".constantize
+  end
+end
diff --git a/lib/action_mailroom/test_helper.rb b/lib/action_mailroom/test_helper.rb
index fbfb2797d9..33d32ec899 100644
--- a/lib/action_mailroom/test_helper.rb
+++ b/lib/action_mailroom/test_helper.rb
@@ -1,3 +1,5 @@
+require "mail"
+
 module ActionMailroom
   module TestHelper
     # Create an InboundEmail record using an eml fixture in the format of message/rfc822
-- 
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