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Add response code of 'B' to lonnet::allowed() to indicate access to a file is currently subject to a block, because the file owner is part of a course with active communications blocking, and file viewer does not have 'evb' privilege in the course to nullify the block.

Used to block access to portfolio files.  Response of 'B' triggers blockedaccess.pm which displays information about blocking conditions.

# The LearningOnline Network
# Information about blocking status for Portfolio files
#
# Copyright Michigan State University Board of Trustees
#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#
# LON-CAPA is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# LON-CAPA is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with LON-CAPA; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
# /home/httpd/html/adm/gpl.txt
#
# http://www.lon-capa.org/
#

package Apache::blockedaccess;

use strict;
use lib '/home/httpd/lib/perl/';
use Apache::Constants qw(:common :http REDIRECT);
use Apache::lonnet;
use Apache::loncommon();
use Apache::lonlocal;

sub handler {
    my $r = shift;
    my $origurl = $r->uri;
    my ($type,$udom,$uname,$file_name,$group) = 
             &Apache::lonnet::parse_portfolio_url($origurl);
    &Apache::loncommon::content_type($r,'text/html');
    $r->send_http_header;
    return OK if $r->header_only;

    &Apache::lonlocal::get_language_handle($r);
    my ($blocked,$blocktext) = 
        &Apache::loncommon::blocking_status('port',$uname,$udom);
    if ($blocked) {
        $r->print(&Apache::loncommon::start_page('Access Temporarily Blocked'));
        $r->print($blocktext);
    } else {
        my $server = &Apache::lonnet::absolute_url();
        $r->header_out(Location => $server.$origurl);
        return REDIRECT;
    }
    $r->print(&Apache::loncommon::end_page());
    return OK;
}

sub setup_handler {
    my ($r) = @_;
    $r->set_handlers('PerlHandler'=>
                     [\&Apache::blockedaccess::handler]);
    $r->handler('perl-script');
}

1;