version 1.4, 2000/10/09 19:37:35
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version 1.52, 2005/03/01 00:22:57
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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/ |
# |
# |
# 10/03,10/05,10/06,10/07,10/09 Gerd Kortemeyer |
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package Apache::lonpageflip; |
package Apache::lonpageflip; |
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Line 24 use GDBM_File;
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Line 39 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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} |
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sub addrid { |
sub addrid { |
my ($current,$new,$condid)=@_; |
my ($current,$new,$condid)=@_; |
unless ($condid) { $condid=0; } |
unless ($condid) { $condid=0; } |
if (&Apache::lonnet::allowed('bre',$hash{'src_'.$new})) { |
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if ($current) { |
if ($current) { |
$current.=','.$new.':'.$condid; |
$current.=','.$new; |
} else { |
} else { |
$current=''.$new.':'.$condid; |
$current=''.$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 ($id)=@_; |
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if ($hash{'encrypted_'.$id}) { |
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return &Apache::lonenc::encrypted($hash{'src_'.$id}); |
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} |
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return $hash{'src_'.$id}; |
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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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map { |
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my $thiscond= |
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&Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$_}}); |
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if ($thiscond>=$mincond) { |
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if ($posnext) { |
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$posnext.=','.$_.':'.$thiscond; |
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} else { |
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$posnext=$_.':'.$thiscond; |
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} |
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if ($thiscond>$mincond) { $mincond=$thiscond; } |
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} |
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} split(/\,/,$hash{'to_'.$rid}); |
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map { |
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my ($linkid,$condval)=split(/\:/,$_); |
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if ($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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} split(/\,/,$posnext); |
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if ($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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map { |
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my $thiscond= |
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&Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$_}}); |
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if ($thiscond>=$mincond) { |
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if ($posnext) { |
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$posnext.=','.$_.':'.$thiscond; |
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} else { |
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$posnext=$_.':'.$thiscond; |
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} |
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if ($thiscond>$mincond) { $mincond=$thiscond; } |
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} |
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} split(/\,/,$hash{'from_'.$rid}); |
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map { |
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my ($linkid,$condval)=split(/\:/,$_); |
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if ($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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} split(/\,/,$posnext); |
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if ($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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# ================================================================ Main Handler |
# ================================================================ Main Handler |
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sub handler { |
sub handler { |
Line 45 sub handler {
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Line 179 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=(); |
my %cachehash=(); |
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my $multichoice=0; |
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my %multichoicehash=(); |
my $redirecturl=''; |
my $redirecturl=''; |
my $next=''; |
my $next=''; |
my @possibilities=(); |
my @possibilities=(); |
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&Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['postdata']); |
if (($ENV{'form.postdata'})&&($ENV{'request.course.fn'})) { |
if (($ENV{'form.postdata'})&&($ENV{'request.course.fn'})) { |
$ENV{'form.postdata'}=~/(\w+)\:(.*)/; |
$ENV{'form.postdata'}=~/(\w+)\:(.*)/; |
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 'return') { |
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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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$newloc='/adm/noidea.html'; |
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} |
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untie %hash; |
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} else { |
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$newloc='/adm/noidea.html'; |
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} |
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&Apache::loncommon::content_type($r,'text/html'); |
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$r->header_out(Location => |
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'http://'.$ENV{'HTTP_HOST'}.$newloc); |
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return REDIRECT; |
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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($last))[2]); |
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} else { |
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&Apache::loncommon::content_type($r,'text/html'); |
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$r->header_out(Location => |
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'http://'.$ENV{'HTTP_HOST'}.'/adm/noidea.html'); |
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return REDIRECT; |
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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,$mapnum]; |
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$cachehash{$startoutmap}{'last_known'}= |
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[&Apache::lonnet::declutter($currenturl),$mapnum]; |
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# ============================================================ Tie the big hash |
if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'.db', |
if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'.db', |
&GDBM_READER,0640)) { |
&GDBM_READER(),0640)) { |
my $rid=$hash{'map_pc_/res/'.$mapurl}.'.'.$mapnum; |
my $rid=$hash{'map_pc_'.&Apache::lonnet::clutter($startoutmap)}. |
my $next=''; |
'.'.$mapnum; |
if ($direction eq 'forward') { |
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map { |
# ------------------------------------------------- Move forward, backward, etc |
$next=&addrid($next,$hash{'goesto_'.$_}, |
my $endupmap; |
$hash{'condid_'.$hash{'undercond_'.$_}}); |
($next,$endupmap)=&move($rid,$startoutmap,$direction); |
} split(/\,/,$hash{'to_'.$rid}); |
# -------------------------------------- Do we have one and only one empty URL? |
} elsif ($direction eq 'back') { |
my $safecount=0; |
map { |
while (($next) && ($next!~/\,/) && |
$next=&addrid($next,$hash{'comesfrom_'.$_}, |
((!$hash{'src_'.$next}) || |
$hash{'condid_'.$hash{'undercond_'.$_}}); |
((!$ENV{'request.role.adv'}) && $hash{'randomout_'.$next})) |
} split(/\,/,$hash{'from_'.$rid}); |
&& ($safecount<10000)) { |
} elsif ($direction eq 'up') { |
($next,$endupmap)=&move($next,$endupmap,$direction); |
} elsif ($direction eq 'down') { |
$safecount++; |
} |
} |
my $redirectid=''; |
# We are now at at least one non-empty URL |
# ----------------------------------------------------- Check out possibilities |
# ----------------------------------------------------- Check out possibilities |
if ($next) { |
if ($next) { |
@possibilities=split(/\,/,$next); |
@possibilities=split(/\,/,$next); |
if ($#possibilities==0) { |
if ($#possibilities==0) { |
$redirectid=(split(/\:/,$next))[0]; |
# ---------------------------------------------- Only one possibility, redirect |
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$redirecturl=&hash_src($next); |
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$cachehash{$endupmap}{$redirecturl}= |
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[$redirecturl,(split(/\./,$next))[1]]; |
} else { |
} else { |
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# ------------------------ There are multiple possibilities for a next resource |
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$multichoice=1; |
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map { |
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$multichoicehash{'src_'.$_}=$hash{'src_'.$_}; |
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$multichoicehash{'title_'.$_}=$hash{'title_'.$_}; |
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$multichoicehash{'type_'.$_}=$hash{'type_'.$_}; |
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(my $first, my $second) = $_ =~ /(\d+).(\d+)/; |
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my $symbSrc = Apache::lonnet::declutter($hash{'src_'.$_}); |
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$multichoicehash{'symb_'.$_} = |
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Apache::lonnet::declutter($hash{'map_id_'.$first}.'___'. |
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$second.'___'.$symbSrc); |
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my ($choicemap,$choiceres)=split(/\./,$_); |
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my $map=&Apache::lonnet::declutter($hash{'src_'.$choicemap}); |
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my $url=$multichoicehash{'src_'.$_}; |
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$cachehash{$map}{$url}=[$url,$choiceres]; |
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} @possibilities; |
} |
} |
} |
} else { |
if ($redirectid) { |
# -------------------------------------------------------------- No place to go |
$redirecturl=$hash{'src_'.$redirectid}; |
$multichoice=-1; |
} |
} |
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# ----------------- The program must come past this point to untie the big hash |
untie(%hash); |
untie(%hash); |
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# --------------------------------------------------------- Store position info |
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$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 |
if ($redirecturl) { |
if ($redirecturl) { |
$r->content_type('text/html'); |
# ----------------------------------------------------- There is a URL to go to |
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if ($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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} |
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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'); |
$r->header_out(Location => |
$r->header_out(Location => |
'http://'.$ENV{'HTTP_HOST'}.$redirecturl); |
'http://'.$ENV{'HTTP_HOST'}.$redirecturl); |
return REDIRECT; |
return REDIRECT; |
} |
} else { |
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# --------------------------------------------------------- There was a problem |
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&Apache::loncommon::content_type($r,'text/html'); |
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$r->send_http_header; |
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if ($#possibilities>0) { |
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my $bodytag= |
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&Apache::loncommon::bodytag('Multiple Resources'); |
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$r->print(<<ENDSTART); |
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<head><title>Choose Next Location</title></head> |
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$bodytag |
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<h3>There are several possibilities of where to go next</h3> |
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<p> |
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Please click on the the resource you intend to access: |
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<p> |
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<table border=2> |
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<tr><th>Title</th><th>Type</th></tr> |
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ENDSTART |
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foreach (@possibilities) { |
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$r->print( |
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'<tr><td><a href="'. |
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$multichoicehash{'src_'.$_}.'?symb=' . |
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Apache::lonnet::escape($multichoicehash{'symb_'.$_}).'">'. |
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$multichoicehash{'title_'.$_}. |
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'</a></td><td>'.$multichoicehash{'type_'.$_}. |
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'</td></tr>'); |
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} |
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$r->print('</table></body></html>'); |
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return OK; |
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} else { |
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my $bodytag=&Apache::loncommon::bodytag('No Resource'); |
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$r->print(<<ENDNONE); |
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<head><title>No Resource</title></head> |
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$bodytag |
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<h3>Next resource could not be identified.</h3> |
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<p>You probably are at the <b>beginning</b> or the <b>end</b> of the |
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course.</p> |
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<ul> |
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<li><a href="/adm/flip?postdata=return:">Go Back</a></li> |
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<li><a href="/adm/navmaps">Navigate Course Content</a></li> |
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</ul> |
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</body> |
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</html> |
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ENDNONE |
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return OK; |
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} |
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} |
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} else { |
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# ------------------------------------------------- Problem, could not tie hash |
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$ENV{'user.error.msg'}="/adm/flip:bre:0:1:Course Data Missing"; |
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return HTTP_NOT_ACCEPTABLE; |
} |
} |
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} else { |
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# ---------------------------------------- No, could not determine where we are |
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if ( &Apache::lonnet::mod_perl_version() == 2 ) { |
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&Apache::lonnet::cleanenv(); |
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} |
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$r->internal_redirect('/adm/ambiguous'); |
} |
} |
# -------------------------------------------------------- No, could not decide |
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} |
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$r->content_type('text/html'); |
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$r->send_http_header; |
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$r->print('<html><body>'); |
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# -------------------------- Class was not initialized or page fliped strangely |
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} else { |
} else { |
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# -------------------------- Class was not initialized or page fliped strangely |
$ENV{'user.error.msg'}="/adm/flip:bre:0:0:Choose Course"; |
$ENV{'user.error.msg'}="/adm/flip:bre:0:0:Choose Course"; |
return HTTP_NOT_ACCEPTABLE; |
return HTTP_NOT_ACCEPTABLE; |
} |
} |
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# ------TRASH BELOW |
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# --------------------------- TRASH |
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$r->print('</body></html>'); |
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return OK; |
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# ========================================================= TOTAL TRASH |
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# &Apache::lonnet::symblist($requrl,%symbhash); |
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} |
} |
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1; |
1; |