Displays thumbnails of attached images of the issue view (#1006).

This behaviour can be turned on/off in Settings -> Display (off by default). Thumbnail size can be configured there too.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@9933 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/controllers/attachments_controller.rb

@@ -17,7 +17,7 @@
 
 class AttachmentsController < ApplicationController
   before_filter :find_project, :except => :upload
-  before_filter :file_readable, :read_authorize, :only => [:show, :download]
+  before_filter :file_readable, :read_authorize, :only => [:show, :download, :thumbnail]
   before_filter :delete_authorize, :only => :destroy
   before_filter :authorize_global, :only => :upload
 
@@ -59,6 +59,18 @@ class AttachmentsController < ApplicationController
 
   end
 
+  def thumbnail
+    if @attachment.thumbnailable? && Setting.thumbnails_enabled? && thumbnail = @attachment.thumbnail
+      send_file thumbnail,
+        :filename => filename_for_content_disposition(@attachment.filename),
+        :type => detect_content_type(@attachment),
+        :disposition => 'inline'
+    else
+      # No thumbnail for the attachment or thumbnail could not be created
+      render :nothing => true, :status => 404
+    end
+  end
+
   def upload
     # Make sure that API users get used to set this content type
     # as it won't trigger Rails' automatic parsing of the request body for parameters