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- Bug 6806. Support anchor in URL set for an external resource.

    1: 
    2: # The LearningOnline Network
    3: # URL translation for encrypted filenames
    4: #
    5: # $Id: lonencurl.pm,v 1.6 2016/02/22 03:36:57 raeburn Exp $
    6: #
    7: # Copyright Michigan State University Board of Trustees
    8: #
    9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
   10: #
   11: # LON-CAPA is free software; you can redistribute it and/or modify
   12: # it under the terms of the GNU General Public License as published by
   13: # the Free Software Foundation; either version 2 of the License, or
   14: # (at your option) any later version.
   15: #
   16: # LON-CAPA is distributed in the hope that it will be useful,
   17: # but WITHOUT ANY WARRANTY; without even the implied warranty of
   18: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   19: # GNU General Public License for more details.
   20: #
   21: # You should have received a copy of the GNU General Public License
   22: # along with LON-CAPA; if not, write to the Free Software
   23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   24: #
   25: # /home/httpd/html/adm/gpl.txt
   26: #
   27: # http://www.lon-capa.org/
   28: #
   29: 
   30: package Apache::lonencurl;
   31: 
   32: use strict;
   33: use Apache::Constants qw(:common :remotehost);
   34: use Apache::lonnet;
   35: use Apache::lonenc;
   36: use GDBM_File;
   37: 
   38: sub handler {
   39:     my $r = shift;
   40: 
   41:     $env{'request.enc'}=1;
   42: 
   43:     my $handle = &Apache::lonnet::check_for_valid_session($r);
   44:     if ($handle ne '') {
   45: # Initialize Environment
   46: 	my $lonidsdir=$r->dir_config('lonIDsDir');
   47: 	&Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
   48: # Decrypt URL, if appropriate, and redirect
   49:         my $redirect;
   50:         my ($decrypted,$encnum,$remainder) = &checkdecryption($r->uri);
   51:         if (($encnum ne '') && ($remainder ne '')) {
   52:             my $referrer = $r->headers_in->{'Referer'} || '';
   53:             my $host = $r->headers_in->{'Host'};
   54:             my $decryptreferrer;
   55:             if ($referrer =~ m{^https?://\Q$host\E(/enc/\Q$encnum\E/[^?]+)}) {
   56:                 ($decryptreferrer) = &checkdecryption($1);
   57:             }
   58:             if ($decryptreferrer eq '') {
   59:                 if ($env{'request.course.fn'} ne '') {
   60:                     my %symbhash;
   61:                     if (tie(%symbhash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
   62:                         &GDBM_READER(),0640)) {
   63:                         my $lastsymb=$symbhash{'last_known'};
   64:                         untie(%symbhash);
   65:                         (undef,undef,$decryptreferrer)=&Apache::lonnet::decode_symb($lastsymb);
   66:                         $decryptreferrer = &Apache::lonnet::clutter($decryptreferrer);
   67:                     }
   68:                 }
   69:             }
   70:             if ($decryptreferrer ne '') {
   71:                 my ($referrerpath) = ($decryptreferrer =~ m{^(.+/)[^/]+$});
   72:                 if (($env{'httpref.'.$referrerpath.$remainder} eq $decryptreferrer) ||
   73:                     ($env{'httpref.'.$referrerpath.'*'} eq $decryptreferrer) ||
   74:                     ($env{'httpref.'.$referrerpath} eq $decryptreferrer)) {
   75:                    $redirect=$referrerpath.$remainder;
   76:                 }
   77:             }
   78:         }
   79:         my $anchor;
   80:         if ($redirect eq '') {
   81:             $redirect=&Apache::lonenc::unencrypted($r->uri);
   82:             if ($redirect =~ m{^/adm/wrapper/ext/[^\#]+(\#.+)$}) {
   83:                $anchor = $1;
   84:                $redirect =~ s/\#.+$//;
   85:             }
   86:         }
   87: 	if ($r->args) { $redirect.='?'.$r->args; }
   88: 	$r->internal_redirect($redirect.$anchor);
   89: 	return OK;
   90:     }
   91:     return FORBIDDEN;
   92: }
   93: 
   94: sub checkdecryption {
   95:     my ($uri) = @_;
   96:     my ($encnum,$encname,$rest) = ($uri =~ m{^/enc/(\d+)/([^.]+)(.*)$});
   97:     my $enclength = length($encname);
   98:     my $rem = $enclength%16;
   99:     if (($encname =~ /[^a-f0-9]/) || ($rem != 0) || ($enclength < 16)) {
  100:         return ('',$encnum,$encname.$rest);
  101:     } else {
  102:         return (&Apache::lonenc::unencrypted($uri));
  103:     }
  104: }
  105: 
  106: 1;
  107: __END__