Validate attachment filenames on every change (#34367).

Patch by Holger Just.


git-svn-id: http://svn.redmine.org/redmine/trunk@20946 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/attachment.rb

   validates_length_of :filename, :maximum => 255
   validates_length_of :disk_filename, :maximum => 255
   validates_length_of :description, :maximum => 255
-  validate :validate_max_file_size, :validate_file_extension
+  validate :validate_max_file_size
+  validate :validate_file_extension, :if => :filename_changed?
 
   acts_as_event(
     :title => :filename,
   end
 
   def validate_file_extension
-    if @temp_file
-      extension = File.extname(filename)
-      unless self.class.valid_extension?(extension)
-        errors.add(:base, l(:error_attachment_extension_not_allowed, :extension => extension))
-      end
+    extension = File.extname(filename)
+    unless self.class.valid_extension?(extension)
+      errors.add(:base, l(:error_attachment_extension_not_allowed, :extension => extension))
     end
   end
 

lib/plugins/acts_as_attachable/lib/acts_as_attachable.rb

               end
               next unless a
               a.description = attachment['description'].to_s.strip
-              if a.new_record?
+              if a.new_record? || a.invalid?
                 unsaved_attachments << a
               else
                 saved_attachments << a

test/unit/attachment_test.rb

     end
   end
 
+  def test_extension_update_should_be_validated_against_denied_extensions
+    with_settings :attachment_extensions_denied => "txt, png" do
+      a = Attachment.new(:container => Issue.find(1),
+                         :file => mock_file_with_options(:original_filename => "test.jpeg"),
+                         :author => User.find(1))
+      assert_save a
+
+      b = Attachment.find(a.id)
+      b.filename = "test.png"
+      assert !b.save
+    end
+  end
+
   def test_valid_extension_should_be_case_insensitive
     with_settings :attachment_extensions_allowed => "txt, Png" do
       assert Attachment.valid_extension?(".pnG")