From 67ab55412f1fad8f6ab9e457f6d81b68d6a47b8c Mon Sep 17 00:00:00 2001
From: Louise Crow <louise.crow@gmail.com>
Date: Thu, 6 Dec 2012 16:25:49 +0000
Subject: Patch the parameter hash used in Mail to handle nil values.

---
 lib/mail_handler/backends/mail_extensions.rb | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

(limited to 'lib/mail_handler/backends/mail_extensions.rb')

diff --git a/lib/mail_handler/backends/mail_extensions.rb b/lib/mail_handler/backends/mail_extensions.rb
index d9106948d..f756abd1a 100644
--- a/lib/mail_handler/backends/mail_extensions.rb
+++ b/lib/mail_handler/backends/mail_extensions.rb
@@ -1,3 +1,5 @@
+require 'mail/message'
+require 'mail/fields/common/parameter_hash'
 module Mail
     class Message
         attr_accessor :url_part_number
@@ -45,4 +47,21 @@ module Mail
             self
         end
     end
+
+    # A patched version of the parameter hash that handles nil values without throwing
+    # an error.
+    class ParameterHash < IndifferentHash
+
+        def encoded
+          map.sort { |a,b| a.first.to_s <=> b.first.to_s }.map do |key_name, value|
+            # The replacement of this commented out line is the change
+            # unless value.ascii_only?
+            unless value.nil? || value.ascii_only?
+              value = Mail::Encodings.param_encode(value)
+              key_name = "#{key_name}*"
+            end
+            %Q{#{key_name}=#{quote_token(value)}}
+          end.join(";\r\n\s")
+        end
+    end
 end
\ No newline at end of file
-- 
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