Allow +1 via email

lib/email/receiver.rb

@@ -21,6 +21,7 @@ module Email
     class ReplyUserNotFoundError < ProcessingError; end
     class ReplyUserNotMatchingError < ProcessingError; end
     class InactiveUserError < ProcessingError; end
+    class InvalidPostAction < ProcessingError; end
 
     attr_reader :body, :email_log
 
@@ -103,7 +104,11 @@ module Email
         raise ReplyUserNotFoundError    if user.blank?
         raise ReplyUserNotMatchingError if @email_log.user_id != user.id
 
-        create_reply(@email_log)
+        if post_action_type = post_action_for(@body)
+          create_post_action(@email_log, post_action_type)
+        else
+          create_reply(@email_log)
+        end
       end
 
     rescue Encoding::UndefinedConversionError, Encoding::InvalidByteSequenceError => e
@@ -239,6 +244,18 @@ module Email
       @body = "[quote=\"#{user_email}\"]\n#{@body}\n[/quote]"
     end
 
+    def create_post_action(email_log, type)
+      PostAction.act(email_log.user, email_log.post, type)
+    rescue PostAction::AlreadyActed => e
+      raise InvalidPostAction.new(e)
+    end
+
+    def post_action_for(body)
+      if ['+1', I18n.t('post_action_types.like.title').downcase].include? body.downcase
+        PostActionType.types[:like]
+      end
+    end
+
     def create_reply(email_log)
       create_post_with_attachments(email_log.user,
                                    raw: @body,