Wrong syntax for resizing inline images may throw a 500 error (#20278).

Fix by Go MAEDA.

git-svn-id: http://svn.redmine.org/redmine/trunk@14473 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/attachment.rb

@@ -294,7 +294,7 @@ class Attachment < ActiveRecord::Base
 
   def self.latest_attach(attachments, filename)
     attachments.sort_by(&:created_on).reverse.detect do |att|
-      att.filename.downcase == filename.downcase
+      filename.casecmp(att.filename) == 0
     end
   end
 

test/unit/attachment_test.rb

@@ -327,6 +327,13 @@ class AttachmentTest < ActiveSupport::TestCase
     set_tmp_attachments_directory
   end
 
+  def test_latest_attach_should_not_error_with_string_with_invalid_encoding
+    string = "width:50\xFE-Image.jpg".force_encoding('UTF-8')
+    assert_equal false, string.valid_encoding?
+
+    Attachment.latest_attach(Attachment.limit(2).to_a, string)
+  end
+
   def test_thumbnailable_should_be_true_for_images
     assert_equal true, Attachment.new(:filename => 'test.jpg').thumbnailable?
   end