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- Bug 6518
  - Exam blocks can also block access to specified folders and/or resources
    for the duration of an exam.
  - Start time for blocking can be based on activation of the timer for
    a specific timed quiz item (map or resource-specific). End time for
    blocking is then start time plus the duration of the timed interval.

lonnet.pm:
  - &rolesinit() now returns an array containing references to hashes
    for the following: userroles, firstaccenv, timerintenv.
  - New db file: timerinterval.db contains interval which applied when
    user activated timer for a map or resource for which time limit applied.
    - needed to determine end time for exam blocks which are triggered by
      timer activation.
   - New routine &get_comm_blocks() used to get communication/collaboration
     blocks from a course.  Now cached for 10 minutes in memcached.
   - New routine: &has_comm_blocking() used to determine if exam block
     applies to display of requested content item in a course. Used by
     &allowed().
   - new routine: &check_docs_block() used by &has_comm_blocking().

loncommon.pm:
   - new items added to user's environment by &init_user_environment()
      - $env{'course.courseid.firstaccess.symb'} and
        $env{'course.courseid.timerinterval.symb'} where symb is the symb
        of the resource or map which provides the activation-based block
        for access to specific content.

blockedaccess.pm:
  - now called when access to content is blocked by an exam block.
    duration, and setter of block now available in pop-up from:
    &loncommon::blocking_status() for this type of access control.

    1: # The LearningOnline Network
    2: # Information about blocking status for Portfolio files
    3: #
    4: # $Id: blockedaccess.pm,v 1.4 2012/03/31 23:10:47 raeburn Exp $
    5: #
    6: # Copyright Michigan State University Board of Trustees
    7: #
    8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
    9: #
   10: # LON-CAPA is free software; you can redistribute it and/or modify
   11: # it under the terms of the GNU General Public License as published by
   12: # the Free Software Foundation; either version 2 of the License, or
   13: # (at your option) any later version.
   14: #
   15: # LON-CAPA is distributed in the hope that it will be useful,
   16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
   17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   18: # GNU General Public License for more details.
   19: #
   20: # You should have received a copy of the GNU General Public License
   21: # along with LON-CAPA; if not, write to the Free Software
   22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   23: #
   24: # /home/httpd/html/adm/gpl.txt
   25: #
   26: # http://www.lon-capa.org/
   27: #
   28: 
   29: package Apache::blockedaccess;
   30: 
   31: use strict;
   32: use Apache::Constants qw(:common :http REDIRECT);
   33: use Apache::lonnet;
   34: use Apache::loncommon();
   35: use Apache::lonlocal;
   36: 
   37: sub handler {
   38:     my $r = shift;
   39:     &Apache::loncommon::content_type($r,'text/html');
   40:     $r->send_http_header;
   41:     return OK if $r->header_only;
   42: 
   43:     &Apache::lonlocal::get_language_handle($r);
   44:     my $origurl = $r->uri;
   45:     my ($blocked,$blocktext);
   46: 
   47:     if (&Apache::lonnet::is_portfolio_url($origurl)) {
   48:         my ($type,$udom,$uname,$file_name,$group) = 
   49: 	    &Apache::lonnet::parse_portfolio_url($origurl);
   50:         ($blocked,$blocktext) = 
   51:             &Apache::loncommon::blocking_status('port',$uname,$udom);
   52:     } else {
   53:         if ($env{'request.course.id'}) {
   54:             my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
   55:             my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
   56:             ($blocked,$blocktext) =
   57:                 &Apache::loncommon::blocking_status('docs',$cnum,$cdom,$origurl);
   58:         }
   59:     }
   60:     if ($blocked) {
   61:         $r->print(&Apache::loncommon::start_page('Access Temporarily Blocked'));
   62:         $r->print($blocktext);
   63:     } else {
   64:         my $server = &Apache::lonnet::absolute_url();
   65:         $r->header_out(Location => $server.$origurl);
   66:         return REDIRECT;
   67:     }
   68:     $r->print(&Apache::loncommon::end_page());
   69:     return OK;
   70: }
   71: 
   72: sub setup_handler {
   73:     my ($r) = @_;
   74:     $r->set_handlers('PerlHandler'=>
   75:                      [\&Apache::blockedaccess::handler]);
   76:     $r->handler('perl-script');
   77: }
   78: 
   79: 1;