Add Mandrill support

1 files changed, 59 insertions, 0 deletions

diff --git a/app/controllers/action_mailbox/ingresses/mandrill/inbound_emails_controller.rb b/app/controllers/action_mailbox/ingresses/mandrill/inbound_emails_controller.rb
new file mode 100644
index 0000000000..825ec6eabd
--- /dev/null
+++ b/app/controllers/action_mailbox/ingresses/mandrill/inbound_emails_controller.rb
@@ -0,0 +1,59 @@
+class ActionMailbox::Ingresses::Mandrill::InboundEmailsController < ActionMailbox::BaseController
+  before_action :ensure_authenticated
+
+  def create
+    raw_emails.each { |raw_email| ActionMailbox::InboundEmail.create_and_extract_message_id! raw_email }
+    head :ok
+  rescue JSON::ParserError => error
+    log.error error.message
+    head :unprocessable_entity
+  end
+
+  private
+    def raw_emails
+      events.lazy.
+        select { |event| event["event"] == "inbound" }.
+        collect { |event| event.dig("msg", "raw_msg") }.
+        collect { |message| StringIO.new message }
+    end
+
+    def events
+      JSON.parse params.require(:mandrill_events)
+    end
+
+
+    def ensure_authenticated
+      head :unauthorized unless authenticated?
+    end
+
+    def authenticated?
+      Authenticator.new(request).authenticated?
+    end
+
+    class Authenticator
+      cattr_accessor :key
+
+      attr_reader :request
+
+      def initialize(request)
+        @request = request
+      end
+
+      def authenticated?
+        ActiveSupport::SecurityUtils.secure_compare given_signature, expected_signature
+      end
+
+      private
+        def given_signature
+          request.headers["X-Mandrill-Signature"]
+        end
+
+        def expected_signature
+          Base64.encode64(OpenSSL::HMAC.digest(OpenSSL::Digest::SHA1.new, key, message)).strip
+        end
+
+        def message
+          [ request.original_url, request.POST.sort ].flatten.join
+        end
+    end
+end