[LON-CAPA-admin] Unicode BOM problem in resource filenames

[H. K. Ng]

Hi,

Interesting how the extra invisible character got inserted into the problem
title??  I have renamed the affected problems so that they do not contain
the character. Hopefully that helps though I suspect you may have to delete
the old problems and import the "new" problems.

-hk


On Mon, Sep 22, 2014 at 1:12 AM, Craig Wiegert <wiegert at physast.uga.edu>
wrote:

> Hi all,
>
> One of our instructors has encountered difficulties with some of the
> problems in the OpenStax archive.  He is able to incorporate the
> resources into a sequence just fine, and both he and the students can
> access the problems.  However, whenever someone submits an answer, they
> get the "invalid access" error: "Sorry... This action is currently not
> authorized."
>
> For example, in the
>
>   /res/fsu/openstax-CollegePhysics/14_HeatAndHeatTransfer/
>
> directory, he was having trouble with Problems 05, 08, and 10.
>
> It turns out that the filename for each of these troublesome problems
> includes a UTF-8 encoded "invisible" Byte-Order Mark (BOM) right after
> the underscore (hex ef bb bf).  This is evident by looking at the
> URL-encoding of these resource filenames, e.g., when incorporating them
> into a sequence.
>
> Is our ability to "read but not answer" these problems a Unicode bug
> within the perl code of LON-CAPA itself?  Is it something obscurely
> locale-related on our servers?  Any help would be appreciated!
>
>   - Craig
>
> ----------------------------------------------------------------------
> Craig Wiegert                           Office: 215 Physics Building
> Undergraduate Physics Coordinator
> Associate Professor                     Phone: 706-542-4023
> Department of Physics & Astronomy       Fax: 706-542-2492
> University of Georgia                   Email: wiegert at physast.uga.edu
> Athens, GA  30602-2451                         cwiegert at uga.edu
>
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