version 1.3, 2000/10/07 22:30:30
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version 1.70, 2006/08/18 20:24:53
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# |
# |
# Page flip handler |
# Page flip handler |
# |
# |
# (Page Handler |
# $Id$ |
# |
# |
# (TeX Content Handler |
# Copyright Michigan State University Board of Trustees |
# |
# |
# 05/29/00,05/30 Gerd Kortemeyer) |
# This file is part of the LearningOnline Network with CAPA (LON-CAPA). |
# 08/30,08/31,09/06,09/14,09/15,09/16,09/19,09/20,09/21,09/23, |
# |
# 10/02 Gerd Kortemeyer) |
# LON-CAPA is free software; you can redistribute it and/or modify |
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# it under the terms of the GNU General Public License as published by |
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# the Free Software Foundation; either version 2 of the License, or |
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# (at your option) any later version. |
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# |
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# LON-CAPA is distributed in the hope that it will be useful, |
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# but WITHOUT ANY WARRANTY; without even the implied warranty of |
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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# GNU General Public License for more details. |
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# |
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# You should have received a copy of the GNU General Public License |
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# along with LON-CAPA; if not, write to the Free Software |
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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# |
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# /home/httpd/html/adm/gpl.txt |
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# |
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# http://www.lon-capa.org/ |
# |
# |
# 10/03,10/05,10/06,10/07 Gerd Kortemeyer |
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package Apache::lonpageflip; |
package Apache::lonpageflip; |
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use strict; |
use strict; |
use Apache::Constants qw(:common :http); |
use LONCAPA; |
use Apache::lonnet(); |
use Apache::Constants qw(:common :http REDIRECT); |
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use Apache::lonnet; |
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use Apache::loncommon(); |
use HTML::TokeParser; |
use HTML::TokeParser; |
use GDBM_File; |
use GDBM_File; |
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Line 24 use GDBM_File;
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Line 41 use GDBM_File;
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my %hash; |
my %hash; |
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sub cleanup { |
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if (tied(%hash)){ |
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&Apache::lonnet::logthis('Cleanup pageflip: hash'); |
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unless (untie(%hash)) { |
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&Apache::lonnet::logthis('Failed cleanup pageflip: hash'); |
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} |
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} |
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return OK; |
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} |
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sub addrid { |
sub addrid { |
my ($current,$new)=@_; |
my ($current,$new,$condid)=@_; |
if (&Apache::lonnet::allowed('bre',$hash{'src_'.$new})) { |
unless ($condid) { $condid=0; } |
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if ($current) { |
if ($current) { |
$current.=','.$new; |
$current.=','.$new; |
} else { |
} else { |
$current=''.$new; |
$current=''.$new; |
} |
} |
} |
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return $current; |
return $current; |
} |
} |
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sub fullmove { |
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my ($rid,$mapurl,$direction)=@_; |
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if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db', |
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&GDBM_READER(),0640)) { |
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($rid,$mapurl)=&move($rid,$mapurl,$direction); |
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untie(%hash); |
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} |
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return($rid,$mapurl); |
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} |
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sub hash_src { |
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my ($id)=@_; |
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my ($mapid,$resid)=split(/\./,$id); |
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my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid}, |
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$resid,$hash{'src_'.$id}); |
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if ($hash{'encrypted_'.$id}) { |
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return (&Apache::lonenc::encrypted($hash{'src_'.$id}), |
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&Apache::lonenc::encrypted($symb)); |
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} |
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return ($hash{'src_'.$id},$symb); |
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} |
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sub move { |
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my ($rid,$mapurl,$direction)=@_; |
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my $startoutrid=$rid; |
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my $next=''; |
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my $mincond=1; |
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my $posnext=''; |
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if ($direction eq 'forward') { |
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# --------------------------------------------------------------------- Forward |
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while ($hash{'type_'.$rid} eq 'finish') { |
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$rid=$hash{'ids_'.$hash{'map_id_'.(split(/\./,$rid))[0]}}; |
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} |
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foreach my $id (split(/\,/,$hash{'to_'.$rid})) { |
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my $condition= $hash{'conditions_'.$hash{'goesto_'.$id}}; |
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my $rescond = &Apache::lonnet::docondval($condition); |
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my $linkcond = &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$id}}); |
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my $thiscond = ($rescond<$linkcond)?$rescond:$linkcond; |
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if ($thiscond>=$mincond) { |
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if ($posnext) { |
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$posnext.=','.$id.':'.$thiscond; |
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} else { |
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$posnext=$id.':'.$thiscond; |
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} |
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if ($thiscond>$mincond) { $mincond=$thiscond; } |
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} |
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} |
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foreach my $id (split(/\,/,$posnext)) { |
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my ($linkid,$condval)=split(/\:/,$id); |
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if ($condval>=$mincond) { |
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$next=&addrid($next,$hash{'goesto_'.$linkid}, |
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$hash{'condid_'.$hash{'undercond_'.$linkid}}); |
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} |
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} |
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if ($hash{'is_map_'.$next}) { |
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# This jumps to the beginning of a new map (going down level) |
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if ( |
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$hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'sequence') { |
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$mapurl=$hash{'src_'.$next}; |
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$next=$hash{'map_start_'.$hash{'src_'.$next}}; |
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} elsif ( |
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# This jumps back up from an empty sequence, to a page up one level |
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$hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'page') { |
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$mapurl=$hash{'map_id_'.(split(/\./,$next))[0]}; |
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} |
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} elsif |
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((split(/\./,$startoutrid))[0]!=(split(/\./,$next))[0]) { |
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# This comes up from a map (coming up one level); |
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$mapurl=$hash{'map_id_'.(split(/\./,$next))[0]}; |
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} |
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} elsif ($direction eq 'back') { |
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# ------------------------------------------------------------------- Backwards |
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while ($hash{'type_'.$rid} eq 'start') { |
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$rid=$hash{'ids_'.$hash{'map_id_'.(split(/\./,$rid))[0]}}; |
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} |
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foreach my $id (split(/\,/,$hash{'from_'.$rid})) { |
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my $condition= $hash{'conditions_'.$hash{'comesfrom_'.$id}}; |
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my $rescond = &Apache::lonnet::docondval($condition); |
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my $linkcond = &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$id}}); |
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my $thiscond = ($rescond<$linkcond)?$rescond:$linkcond; |
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if ($thiscond>=$mincond) { |
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if ($posnext) { |
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$posnext.=','.$id.':'.$thiscond; |
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} else { |
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$posnext=$id.':'.$thiscond; |
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} |
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if ($thiscond>$mincond) { $mincond=$thiscond; } |
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} |
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} |
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foreach my $id (split(/\,/,$posnext)) { |
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my ($linkid,$condval)=split(/\:/,$id); |
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if ($condval>=$mincond) { |
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$next=&addrid($next,$hash{'comesfrom_'.$linkid}, |
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$hash{'condid_'.$hash{'undercond_'.$linkid}}); |
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} |
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} |
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if ($hash{'is_map_'.$next}) { |
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# This jumps to the end of a new map (going down one level) |
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if ( |
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$hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'sequence') { |
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$mapurl=$hash{'src_'.$next}; |
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$next=$hash{'map_finish_'.$hash{'src_'.$next}}; |
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} elsif ( |
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$hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'page') { |
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# This jumps back up from an empty sequence, to a page up one level |
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$mapurl=$hash{'map_id_'.(split(/\./,$next))[0]}; |
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} |
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} elsif |
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((split(/\./,$startoutrid))[0]!=(split(/\./,$next))[0]) { |
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# This comes back up from a map (going up one level); |
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$mapurl=$hash{'map_id_'.(split(/\./,$next))[0]}; |
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} |
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} |
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return ($next,$mapurl); |
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} |
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sub navlaunch { |
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my ($r)=@_; |
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&Apache::loncommon::content_type($r,'text/html'); |
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&Apache::loncommon::no_cache($r); |
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$r->send_http_header; |
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$r->print(&Apache::loncommon::start_page('Launched')); |
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$r->print(<<ENDNAV); |
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<p><a href="/adm/flip?postdata=firstres%3a">Goto first resource</a></p> |
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<script type="text/javascript"> |
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function collapse() { |
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menu=window.open("/adm/navmaps?collapseExternal","loncapanav", |
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"height=600,width=400,scrollbars=1"); |
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this.document.location='/adm/navmaps?turningOffExternal'; |
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} |
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</script> |
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<p><a href="javascript:collapse();">Collapse external navigation window</a></p> |
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ENDNAV |
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$r->print(&Apache::loncommon::end_page()); |
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} |
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sub first_accessible_resource { |
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my $furl; |
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if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db', |
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&GDBM_READER(),0640)) { |
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$furl=$hash{'first_url'}; |
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if (!&Apache::lonnet::allowed('bre',$furl)) { |
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# Wow, we cannot see this ... move forward to the next one that we can see |
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my ($newrid,$newmap)=&move($hash{'first_rid'},$hash{'first_mapurl'},'forward'); |
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# Build the new URL |
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my ($newresid,$newmapid)=split(/\./,$newrid); |
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my $symb=&Apache::lonnet::encode_symb($newmap,$newresid,$hash{'src_'.$newrid}); |
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$furl=&add_get_param($hash{'src_'.$newrid},{ 'symb' => $symb }); |
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if ($hash{'encrypted_'.$newrid}) { |
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$furl=&Apache::lonenc::encrypted($furl); |
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} |
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} |
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untie(%hash); |
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return $furl; |
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} else { |
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return '/adm/navmaps'; |
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} |
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} |
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# ================================================================ Main Handler |
# ================================================================ Main Handler |
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sub handler { |
sub handler { |
Line 44 sub handler {
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Line 233 sub handler {
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# ------------------------------------------- Set document type for header only |
# ------------------------------------------- Set document type for header only |
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if ($r->header_only) { |
if ($r->header_only) { |
$r->content_type('text/html'); |
&Apache::loncommon::content_type($r,'text/html'); |
$r->send_http_header; |
$r->send_http_header; |
return OK; |
return OK; |
} |
} |
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my %cachehash=(); |
# --------BEGIN DEBUG ONLY TRASH |
my $multichoice=0; |
$r->content_type('text/html'); |
my %multichoicehash=(); |
$r->send_http_header; |
my ($redirecturl,$redirectsymb); |
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my $next=''; |
$r->print('<html><body>'); |
my @possibilities=(); |
# --------END DEBUG ONLY TRASH |
&Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['postdata']); |
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if (($env{'form.postdata'})&&($env{'request.course.fn'})) { |
my %cachehash=(); |
$env{'form.postdata'}=~/(\w+)\:(.*)/; |
my $redir=0; |
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if (($ENV{'form.postdata'})&&($ENV{'request.course.fn'})) { |
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$ENV{'form.postdata'}=~/(\w+)\:(.*)/; |
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my $direction=$1; |
my $direction=$1; |
my $currenturl=$2; |
my $currenturl=$2; |
my $redirecturl=$currenturl; |
if ($currenturl=~m|^/enc/|) { |
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$currenturl=&Apache::lonenc::unencrypted($currenturl); |
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} |
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$currenturl=~s/\.\d+\.(\w+)$/\.$1/; |
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if ($direction eq 'firstres') { |
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my $furl=&first_accessible_resource(); |
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&Apache::loncommon::content_type($r,'text/html'); |
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$r->header_out(Location => |
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&Apache::loncommon::absolute_url().$furl); |
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return REDIRECT; |
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} |
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if ($direction eq 'return' || $direction eq 'navlaunch') { |
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# -------------------------------------------------------- Return to last known |
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my $last; |
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if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db', |
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&GDBM_READER(),0640)) { |
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$last=$hash{'last_known'}; |
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untie(%hash); |
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} |
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my $newloc; |
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if (($last) && (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db', |
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&GDBM_READER(),0640))) { |
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my ($murl,$id,$fn)=&Apache::lonnet::decode_symb($last); |
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$id=$hash{'map_pc_'.&Apache::lonnet::clutter($murl)}.'.'.$id; |
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$newloc=$hash{'src_'.$id}; |
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if ($newloc) { |
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if ($hash{'encrypted_'.$id}) { $newloc=&Apache::lonenc::encrypted($newloc); } |
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} else { |
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$newloc='/adm/navmaps'; |
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} |
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untie %hash; |
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} else { |
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$newloc='/adm/navmaps'; |
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} |
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if ($newloc eq '/adm/navmaps' && $direction eq 'navlaunch') { |
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&navlaunch($r); |
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return OK; |
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} else { |
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&Apache::loncommon::content_type($r,'text/html'); |
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$r->header_out(Location => |
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&Apache::loncommon::absolute_url().$newloc); |
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return REDIRECT; |
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} |
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} |
$currenturl=~s/^http\:\/\///; |
$currenturl=~s/^http\:\/\///; |
$currenturl=~s/^[^\/]+//; |
$currenturl=~s/^[^\/]+//; |
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# |
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# Is the current URL on the map? If not, start with last known URL |
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# |
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unless (&Apache::lonnet::is_on_map($currenturl)) { |
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my $last; |
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if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db', |
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&GDBM_READER(),0640)) { |
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$last=$hash{'last_known'}; |
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untie(%hash); |
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} |
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if ($last) { |
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$currenturl=&Apache::lonnet::clutter((&Apache::lonnet::decode_symb($last))[2]); |
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} else { |
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if ($direction eq 'return') { |
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&Apache::loncommon::content_type($r,'text/html'); |
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$r->header_out(Location => |
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&Apache::loncommon::absolute_url(). |
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'/adm/noidea.html'); |
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return REDIRECT; |
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} else { |
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&navlaunch($r); |
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return OK; |
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} |
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} |
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} |
# ------------------------------------------- Do we have any idea where we are? |
# ------------------------------------------- Do we have any idea where we are? |
my $position; |
my $position; |
if ($position=Apache::lonnet::symbread($currenturl)) { |
if ($position=Apache::lonnet::symbread($currenturl)) { |
# ------------------------------------------------------------------------- Yes |
# ------------------------------------------------------------------------- Yes |
my ($mapurl,$mapnum,$thisurl)=split(/\_\_\_/,$position); |
my ($startoutmap,$mapnum,$thisurl)=&Apache::lonnet::decode_symb($position); |
$cachehash{$thisurl}=$mapnum; |
$cachehash{$startoutmap}{$thisurl}=[$thisurl,$mapnum]; |
if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'.db', |
$cachehash{$startoutmap}{'last_known'}= |
&GDBM_READER,0640)) { |
[&Apache::lonnet::declutter($currenturl),$mapnum]; |
my $rid=$hash{'map_pc_/res/'.$mapurl}.'.'.$mapnum; |
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my $next=''; |
# ============================================================ Tie the big hash |
if ($direction eq 'forward') { |
if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db', |
map { |
&GDBM_READER(),0640)) { |
$next=&addrid($next,$hash{'goesto_'.$_}); |
my $rid=$hash{'map_pc_'.&Apache::lonnet::clutter($startoutmap)}. |
} split(/\,/,$hash{'to_'.$rid}); |
'.'.$mapnum; |
my @possibilities=split(/,/,$next); |
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if ($#possibilities==1) { |
# ------------------------------------------------- Move forward, backward, etc |
my $goto=$possibilities[0]; |
my $endupmap; |
} |
($next,$endupmap)=&move($rid,$startoutmap,$direction); |
} elsif ($direction eq 'back') { |
# -------------------------------------- Do we have one and only one empty URL? |
} elsif ($direction eq 'up') { |
my $safecount=0; |
} elsif ($direction eq 'down') { |
while (($next) && ($next!~/\,/) && |
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((!$hash{'src_'.$next}) || |
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((!$env{'request.role.adv'}) && $hash{'randomout_'.$next})) |
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&& ($safecount<10000)) { |
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($next,$endupmap)=&move($next,$endupmap,$direction); |
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$safecount++; |
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} |
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# We are now at at least one non-empty URL |
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# ----------------------------------------------------- Check out possibilities |
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if ($next) { |
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@possibilities=split(/\,/,$next); |
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if ($#possibilities==0) { |
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# ---------------------------------------------- Only one possibility, redirect |
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($redirecturl,$redirectsymb)=&hash_src($next); |
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$cachehash{$endupmap}{$redirecturl}= |
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[$redirecturl,(split(/\./,$next))[1]]; |
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} else { |
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# ------------------------ There are multiple possibilities for a next resource |
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$multichoice=1; |
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foreach my $id (@possibilities) { |
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$multichoicehash{'src_'.$id}=$hash{'src_'.$id}; |
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$multichoicehash{'title_'.$id}=$hash{'title_'.$id}; |
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$multichoicehash{'type_'.$id}=$hash{'type_'.$id}; |
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(my $first, my $second) = $id =~ /(\d+).(\d+)/; |
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my $symbSrc = Apache::lonnet::declutter($hash{'src_'.$id}); |
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$multichoicehash{'symb_'.$id} = |
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Apache::lonnet::declutter($hash{'map_id_'.$first}.'___'. |
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$second.'___'.$symbSrc); |
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my ($choicemap,$choiceres)=split(/\./,$id); |
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my $map=&Apache::lonnet::declutter($hash{'src_'.$choicemap}); |
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my $url=$multichoicehash{'src_'.$id}; |
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$cachehash{$map}{$url}=[$url,$choiceres]; |
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} |
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} |
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} else { |
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# -------------------------------------------------------------- No place to go |
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$multichoice=-1; |
} |
} |
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# ----------------- The program must come past this point to untie the big hash |
untie(%hash); |
untie(%hash); |
$r->print($rid.' - '.$next); |
# --------------------------------------------------------- Store position info |
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$cachehash{$startoutmap}{'last_direction'}=[$direction,'notasymb']; |
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foreach my $thismap (keys %cachehash) { |
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my $mapnum=$cachehash{$thismap}->{'mapnum'}; |
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delete($cachehash{$thismap}->{'mapnum'}); |
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&Apache::lonnet::symblist($thismap, |
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%{$cachehash{$thismap}}); |
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} |
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# ============================================== Do not return before this line |
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if ($redirecturl) { |
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# ----------------------------------------------------- There is a URL to go to |
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if ($direction eq 'forward') { |
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&Apache::lonnet::linklog($currenturl,$redirecturl); |
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} |
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if ($direction eq 'back') { |
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&Apache::lonnet::linklog($redirecturl,$currenturl); |
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} |
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# ------------------------------------------------- Check for critical messages |
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if ((time-$env{'user.criticalcheck.time'})>300) { |
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my @what=&Apache::lonnet::dump |
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('critical',$env{'user.domain'}, |
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$env{'user.name'}); |
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if ($what[0]) { |
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if (($what[0] ne 'con_lost') && |
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($what[0]!~/^error\:/)) { |
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$redirecturl='/adm/email?critical=display'; |
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$redirectsymb=''; |
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} |
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} |
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&Apache::lonnet::appenv('user.criticalcheck.time'=>time); |
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} |
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&Apache::loncommon::content_type($r,'text/html'); |
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my $url=&Apache::loncommon::absolute_url().$redirecturl; |
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$url = &add_get_param($url, { 'symb' => $redirectsymb}); |
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$r->header_out(Location => $url); |
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return REDIRECT; |
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} else { |
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# --------------------------------------------------------- There was a problem |
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&Apache::loncommon::content_type($r,'text/html'); |
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$r->send_http_header; |
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my %lt=&Apache::lonlocal::texthash('title' => 'End of Sequence', |
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'explain' => |
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'You have reached the end of the sequence of materials.', |
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'back' => 'Go Back', |
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'nav' => 'Navigate Course Content', |
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'wherenext' => |
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'There are several possibilities of where to go next', |
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'pick' => |
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'Please click on the the resource you intend to access', |
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'titleheader' => 'Title', |
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'type' => 'Type'); |
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if ($#possibilities>0) { |
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my $start_page= |
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&Apache::loncommon::start_page('Multiple Resources'); |
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$r->print(<<ENDSTART); |
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$start_page |
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<h3>$lt{'wherenext'}</h3> |
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<p> |
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$lt{'pick'}: |
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<p> |
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<table border=2> |
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<tr><th>$lt{'titleheader'}</th><th>$lt{'type'}</th></tr> |
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ENDSTART |
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foreach my $id (@possibilities) { |
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$r->print( |
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'<tr><td><a href="'. |
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&add_get_param($multichoicehash{'src_'.$id}, |
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{'symb' => |
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$multichoicehash{'symb_'.$id}, |
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}).'">'. |
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$multichoicehash{'title_'.$id}. |
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'</a></td><td>'.$multichoicehash{'type_'.$id}. |
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'</td></tr>'); |
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} |
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$r->print('</table>'); |
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} else { |
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my $start_page= |
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&Apache::loncommon::start_page('No Resource'); |
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$r->print(<<ENDNONE); |
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$start_page |
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<h3>$lt{'title'}</h3> |
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<p>$lt{'explain'}</p> |
|
ENDNONE |
|
} |
|
$r->print(<<ENDMENU); |
|
<ul> |
|
<li><a href="/adm/flip?postdata=return:">$lt{'back'}</a></li> |
|
<li><a href="/adm/navmaps">$lt{'nav'}</a></li> |
|
</ul> |
|
ENDMENU |
|
$r->print(&Apache::loncommon::end_page()); |
|
return OK; |
|
} |
|
} else { |
|
# ------------------------------------------------- Problem, could not tie hash |
|
$env{'user.error.msg'}="/adm/flip:bre:0:1:Course Data Missing"; |
|
return HTTP_NOT_ACCEPTABLE; |
} |
} |
} else { |
} else { |
# -------------------------------------------------------------------------- No |
# ---------------------------------------- No, could not determine where we are |
$r->print('No idea '.$currenturl); |
$r->internal_redirect('/adm/ambiguous'); |
} |
} |
# -------------------------- Class was not initialized or page fliped strangely |
|
} else { |
} else { |
$ENV{'user.error.msg'}="/adm/flip:bre:0:0:Choose Course"; |
# -------------------------- Class was not initialized or page fliped strangely |
|
$env{'user.error.msg'}="/adm/flip:bre:0:0:Choose Course"; |
return HTTP_NOT_ACCEPTABLE; |
return HTTP_NOT_ACCEPTABLE; |
} |
} |
|
|
|
|
|
|
|
|
# ------TRASH BELOW |
|
# --------------------------- TRASH |
|
|
|
$r->print('</body></html>'); |
|
return OK; |
|
|
|
|
|
# ========================================================= TOTAL TRASH |
|
|
|
# &Apache::lonnet::symblist($requrl,%symbhash); |
|
|
|
} |
} |
|
|
1; |
1; |