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- Bug 6518.
  More comprehensive access to symb for a requested URL to determine when
  access should be blocked and why, if content blocking in use.

    1: # The LearningOnline Network
    2: # Information about blocking status for Portfolio files
    3: #
    4: # $Id: blockedaccess.pm,v 1.5 2020/09/28 00:10:27 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);
   33: use Apache::lonnet;
   34: use Apache::loncommon();
   35: use Apache::lonlocal;
   36: use HTML::Entities();
   37: 
   38: sub handler {
   39:     my $r = shift;
   40:     &Apache::loncommon::content_type($r,'text/html');
   41:     $r->send_http_header;
   42:     return OK if $r->header_only;
   43: 
   44:     &Apache::lonlocal::get_language_handle($r);
   45:     my $origurl = &Apache::lonnet::deversion($r->uri);
   46:     my ($blocked,$blocktext);
   47: 
   48:     if (&Apache::lonnet::is_portfolio_url($origurl)) {
   49:         my ($type,$udom,$uname,$file_name,$group) = 
   50: 	    &Apache::lonnet::parse_portfolio_url($origurl);
   51:         ($blocked,$blocktext) = 
   52:             &Apache::loncommon::blocking_status('port',$uname,$udom);
   53:     } else {
   54:         if ($env{'request.course.id'}) {
   55:             my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
   56:             my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
   57:             my $symb = $env{'request.symb'};
   58:             ($blocked,$blocktext) =
   59:                 &Apache::loncommon::blocking_status('docs',$cnum,$cdom,$origurl,1,$symb,'blockedaccess');
   60:         }
   61:     }
   62:     if ($blocked) {
   63:         $r->print(&Apache::loncommon::start_page('Access Temporarily Blocked'));
   64:         $r->print($blocktext);
   65:     } elsif ($origurl eq '/adm/blockedaccess') {
   66:         $r->print(&Apache::loncommon::start_page('Access Blocking Information'));
   67:         $r->print('<p class="LC_warning">'.&mt('Could not determine which page had access blocked.').'</p>');
   68:     } else {
   69:         $r->print(&Apache::loncommon::start_page('Access Blocking Information'));
   70:         my $link;
   71:         if ($origurl ne '') {
   72:             my $showurl = &Apache::lonenc::check_encrypt($origurl);
   73:             $link = &Apache::lonnet::absolute_url().$showurl;
   74:             if ($r->args ne '') {
   75:                 $link .= '?'.$r->args;
   76:             }
   77:         }
   78:         $r->print('<p class="LC_info">'.
   79:                   &mt('The page you are trying to reach was reported as having access blocked, but the reason is not available.').
   80:                   '</p>');
   81:         if ($link) {
   82:             $r->print('<p><a href="'.&HTML::Entities::encode($link,'\'"<>&').'">'.&mt('Try again?').'</a></p>');
   83:         }
   84:     }
   85:     $r->print(&Apache::loncommon::end_page());
   86:     return OK;
   87: }
   88: 
   89: sub setup_handler {
   90:     my ($r) = @_;
   91:     $r->set_handlers('PerlHandler'=>
   92:                      [\&Apache::blockedaccess::handler]);
   93:     $r->handler('perl-script');
   94: }
   95: 
   96: 1;