# The LearningOnline Network with CAPA # # Sequence Handler # # $Id: lonsequence.pm,v 1.17 2004/05/21 20:16:40 raeburn Exp $ # # Copyright Michigan State University Board of Trustees # # This file is part of the LearningOnline Network with CAPA (LON-CAPA). # # LON-CAPA is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2 of the License, or # (at your option) any later version. # # LON-CAPA is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with LON-CAPA; if not, write to the Free Software # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA # # /home/httpd/html/adm/gpl.txt # # http://www.lon-capa.org/ # # (Handler to resolve ambiguous file locations # # (TeX Content Handler # # 05/29/00,05/30,10/11 Gerd Kortemeyer) # # 10/11,10/12 Gerd Kortemeyer) # # 10/16 Gerd Kortemeyer package Apache::lonsequence; use strict; use Apache::lonnet; use Apache::Constants qw(:common :http REDIRECT); use GDBM_File; use Apache::lonratedt; use Apache::lonratsrv; use Apache::lonpageflip; use Apache::loncommon; use Apache::lonlocal; my %selhash; my $successtied; # ----------------------------------------- Attempt to read from resource space sub attemptread { my $fn=shift; &Apache::lonnet::repcopy($fn); if (-e $fn) { return &Apache::lonratedt::attemptread($fn); } else { return (); } } sub mapread { my $fn=shift; &Apache::lonnet::repcopy($fn); if (-e $fn) { return &Apache::lonratedt::mapread($fn,''); } else { return (); } } # ---------------------------------------------------------------- View Handler sub viewmap { my ($r,$url)=@_; $r->print(''); if ($ENV{'form.forceselect'}) { $r->print(< function select_group() { window.location="/adm/groupsort?catalogmode=groupsec&mode=rat&acts="+document.forms.fileattr.acts.value; } function queue(val) { if (eval("document.forms."+val+".filelink.checked")) { var l=val.length; var v=val.substring(4,l); document.forms.fileattr.acts.value+='1a'+v+'b'; } else { var l=val.length; var v=val.substring(4,l); document.forms.fileattr.acts.value+='0a'+v+'b'; } } ENDSCRIPT } $r->print(&Apache::loncommon::bodytag('Map Contents').'

'.$url.'

'); # ------------------ This is trying to select. Provide buttons and tie %selhash if ($ENV{'form.forceselect'}) { $r->print(< ENDSELECT my $diropendb = "/home/httpd/perl/tmp/$ENV{'user.domain'}\_$ENV{'user.name'}_groupsec.db"; if (tie(%selhash,'GDBM_File',$diropendb,&GDBM_WRCREAT(),0640)) { if ($ENV{'form.launch'} eq '1') { &start_fresh_session(); } $successtied=1; # - Evaluate actions from previous page (both cumulatively and chronologically) if ($ENV{'form.catalogmode'} eq 'groupimport') { my $acts=$ENV{'form.acts'}; my @Acts=split(/b/,$acts); my %ahash; my %achash; my $ac=0; # some initial hashes for working with data foreach (@Acts) { my ($state,$ref)=split(/a/); $ahash{$ref}=$state; $achash{$ref}=$ac; $ac++; } # sorting through the actions and changing the tied database hash foreach (sort {$achash{$a}<=>$achash{$b}} (keys %ahash)) { my $key=$_; if ($ahash{$key} eq '1') { $selhash{'store_'.$selhash{'pre_'.$key.'_link'}}= $selhash{'pre_'.$key.'_title'}; $selhash{'storectr_'.$selhash{'pre_'.$key.'_link'}}= $selhash{'storectr'}+0; $selhash{'storectr'}++; } if ($ahash{$key} eq '0') { if ($selhash{'store_'.$selhash{'pre_'.$key.'_link'}}) { delete $selhash{'store_'.$selhash{'pre_'.$key.'_link'}}; } } } # deleting the previously cached listing foreach (keys %selhash) { if ($_ =~ /^pre_/ && $_ =~/link$/) { my $key = $_; $key =~ s/^pre_//; $key =~ s/_[^_]*$//; delete $selhash{'pre_'.$key.'_title'}; delete $selhash{'pre_'.$key.'_link'}; } } } # - } } # ----------------------------- successtied is now '1' if in working selectmode my ($errtext,$fatal)=&mapread(&Apache::lonnet::filelocation('',$url),''); if ($fatal==1) { $r->print('

'.&mt('Map contents are not shown in order.').'

'); } my $idx=0; foreach (&attemptread(&Apache::lonnet::filelocation('',$url))) { if (defined($_)) { $idx++; if ($successtied) { $r->print('

'); } my ($title,$url)=split(/\:/,$_); $title=~s/\&colon\;/\:/g; $url=~s/\&colon\;/\:/g; unless ($title) { $title=(split(/\//,$url))[-1] }; unless ($title) { $title=''.&mt('Empty').''; } if ($url) { if ($successtied) { my $checked=''; if ($selhash{'store_'.$url}) { $checked=" checked"; } $selhash{"pre_${idx}_link"}=$url; $selhash{"pre_${idx}_title"}=$title; $r->print(< ENDCHECKBOX } $r->print(''); } $r->print(&Apache::lonratsrv::qtescape($title)); if ($url) { $r->print(''); } if ($successtied) { $r->print(''); } else { $r->print('
'); } } } $r->print(''); if ($successtied) { untie %selhash; } } # ----------------------------------------------------------- Clean out selhash sub start_fresh_session { foreach (keys %selhash) { if ($_ =~ /^pre_/) { delete $selhash{$_}; } if ($_ =~ /^store/) { delete $selhash{$_}; } } } # ================================================================ Main Handler sub handler { my $r=shift; if ($r->header_only) { &Apache::loncommon::content_type($r,'text/html'); $r->send_http_header; return OK; } &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'}, ['forceselect','launch']); my %hash; my %bighash; my $requrl=$r->uri; $successtied=0; # ------------------------------------------------------------ Tie symb db file my $disurl=''; my $dismapid=''; if (($ENV{'request.course.fn'}) && (!$ENV{'form.forceselect'})) { my $last; if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db', &GDBM_READER(),0640)) { $last=$hash{'last_direction'}; untie(%hash); } my $direction=''; my $prevmap=''; if ($last) { ($prevmap,$direction)=(split(/\_\_\_/,$last)); } # ------------------------------------------------------------- Tie big db file if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db', &GDBM_READER(),0640)) { my $disid=''; my $randomout =''; if ($direction eq 'back') { $disid=$bighash{'map_finish_'.$requrl}; } else { $disid=$bighash{'map_start_'.$requrl}; } if ($disid) { $disurl=$bighash{'src_'.$disid}; $dismapid=(split(/\./,$disid))[1]; $randomout = $bighash{'randomout_'.$disid}; } # ----------- If this is an empty one, or hidden, skip to next non-empty or non-hidden one if ( ((!$disurl) && ($disid)) || ($randomout && $disid) ) { $direction=($direction?$direction:'forward'); ($disid,$requrl)= &Apache::lonpageflip::fullmove($disid, &Apache::lonnet::declutter($requrl),$direction); if ($disid) { $disurl=$bighash{'src_'.$disid}; $dismapid=(split(/\./,$disid))[1]; } } # --------------------------------------- Untie hash, make sure to come by here untie(%bighash); } } # now either disurl is set (going to first page), or we need another display if ($disurl) { # -------------------------------------------------- Has first or last resource &Apache::lonnet::symblist($requrl,$disurl => $dismapid, 'last_known' => &Apache::lonnet::declutter($disurl)); &Apache::loncommon::content_type($r,'text/html'); $r->header_out(Location => 'http://'.$ENV{'HTTP_HOST'}.$disurl); return REDIRECT; } else { &Apache::loncommon::content_type($r,'text/html'); $r->send_http_header; &viewmap($r,$requrl); return OK; } } 1; __END__ 500 Internal Server Error

Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator at root@localhost to inform them of the time this error occurred, and the actions you performed just before this error.

More information about this error may be available in the server error log.