--- rat/lonsequence.pm 2000/10/16 20:47:39 1.1 +++ rat/lonsequence.pm 2007/01/16 21:19:11 1.30 @@ -2,178 +2,357 @@ # # Sequence Handler # -# (Handler to resolve ambiguous file locations +# $Id: lonsequence.pm,v 1.30 2007/01/16 21:19:11 albertel Exp $ # -# (TeX Content Handler +# Copyright Michigan State University Board of Trustees # -# 05/29/00,05/30,10/11 Gerd Kortemeyer) +# This file is part of the LearningOnline Network with CAPA (LON-CAPA). # -# 10/11,10/12 Gerd Kortemeyer) +# 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/ # -# 10/16 Gerd Kortemeyer -package Apache::lonambiguous; +package Apache::lonsequence; use strict; use Apache::lonnet; -use Apache::Constants qw(:common REDIRECT); +use Apache::Constants qw(:common :http REDIRECT); use GDBM_File; +use LONCAPA::map(); +use Apache::lonpageflip(); +use Apache::loncommon(); +use Apache::lonlocal; +use HTML::Entities(); + +my %selhash; +my $successtied; + +# ----------------------------------------- Attempt to read from resource space + +sub attemptread { + my $fn=shift; + &Apache::lonnet::repcopy($fn); + if (-e $fn) { + return &LONCAPA::map::attemptread($fn); + } else { + return (); + } +} +sub mapread { + my $fn=shift; + &Apache::lonnet::repcopy($fn); + if (-e $fn) { + return &LONCAPA::map::mapread($fn,''); + } else { + return (); + } +} + +# ---------------------------------------------------------------- View Handler -# ----------------------------------------------------------- Could not resolve +sub viewmap { + my ($r,$url)=@_; + + my $js; + if ($env{'form.forceselect'}) { + $js = (< + +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 + } + + $r->print(&Apache::loncommon::start_page('Map Contents',$js). + '

'.$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'}\_$env{'user.name'}_sel_res.db"; + if (tie(%selhash,'GDBM_File',$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 'import') { + 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,$url)=split(/\:/,$_); + $title = &LONCAPA::map::qtescape($title); + unless ($title) { $title=(split(/\//,$url))[-1] }; + my $enc_title = &HTML::Entities::encode($title,'\'"<>&'); + unless ($title) { + $title=''.&mt('Empty').''; + $enc_title = &mt('Empty'); + } + $url = &LONCAPA::map::qtescape($url); + my $enc_url = &HTML::Entities::encode($url,'\'"<>&'); + if ($url) { + if ($successtied) { + my $checked=''; + if ($selhash{'store_'.$url}) { + $checked=" checked"; + } + $selhash{"pre_${idx}_link"}=$url; + $selhash{"pre_${idx}_title"}=$title; + + $url = &HTML::Entities::encode($url, '\'"<>&'); + $r->print(< + +ENDCHECKBOX + } + $r->print(''); + } + $r->print($enc_title); + if ($url) { $r->print(''); } + if ($successtied) { + $r->print(''); + } else { + $r->print('
'); + } + } + } + $r->print(&Apache::loncommon::end_page()); + if ($successtied) { + untie %selhash; + } +} -sub getlost { - my ($r,$errmsg)=@_; - $r->content_type('text/html'); - $r->send_http_header; - $r->print( - 'Unknown Error

'. - 'LON-CAPA

Could not handle ambiguous resource reference.

'.$errmsg. - ''); +# ----------------------------------------------------------- Clean out selhash +sub start_fresh_session { + foreach (keys %selhash) { + if ($_ =~ /^pre_/) { + delete $selhash{$_}; + } + if ($_ =~ /^store/) { + delete $selhash{$_}; + } + } } + # ================================================================ Main Handler sub handler { my $r=shift; if ($r->header_only) { - $r->content_type('text/html'); + &Apache::loncommon::content_type($r,'text/html'); $r->send_http_header; return OK; } + + &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'}, + ['forceselect','launch']); + my %hash; my %bighash; -# ----------------------------------------------------------------- Tie db file - if ($ENV{'request.course.fn'}) { - my $envkey; - if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db', - &GDBM_READER,0640)) { - foreach $envkey (keys %ENV) { - if ($envkey=~/^form\.(\d+)\.(\d+)$/) { - my $mapid=$1; - my $resid=$2; - my $resurl=$bighash{'src_'.$mapid.'.'.$resid}; - &Apache::lonnet::symblist($bighash{'map_id_'.$mapid}, - $resurl => $resid); - $r->header_out(Location => - 'http://'.$ENV{'HTTP_HOST'}.$resurl); - return REDIRECT; - } - } - untie(%bighash); - } else { - &getlost($r,'Could not access course structure.'); - return OK; - } - } else { - $ENV{'user.error.msg'}="$requrl:bre:0:0:Course not initialized"; - return HTTP_NOT_ACCEPTABLE; - } - - return OK; - -# ================================================================= TRASH BELOW + my $requrl=$r->uri; -# ---------------------------------------------------------- Do we have a case? + $successtied=0; +# ------------------------------------------------------------ Tie symb db file + my $disurl=''; + my $dismapid=''; + my $exitdisid = ''; + my $arrow_dir = ''; + + if (($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) { + ($prevmap,undef,$direction)=&Apache::lonnet::decode_symb($last); + } +# ------------------------------------------------------------- Tie big db file + if (tie(%bighash,'GDBM_File',$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]; + if (!$env{'request.role.adv'}) { + $randomout = $bighash{'randomout_'.$disid}; + } + } elsif (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db', + &GDBM_READER(),0640)) { + $last=$hash{'last_known'}; + untie(%hash); + } + + +# ----------- If this is an empty one, or hidden, skip to next non-empty or non-hidden one + while ( ((!$disurl) && ($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]; + if (!$env{'request.role.adv'}) { + $randomout = $bighash{'randomout_'.$disid}; + } + } + } + $exitdisid = $disid; + $arrow_dir = $direction; - my $thisfn; - unless (($thisfn=$ENV{'request.ambiguous'})&&($ENV{'request.course.fn'})) { - &getlost($r,'Could not find information on resource.'); - return OK; +# --------------------------------------- Untie hash, make sure to come by here + untie(%bighash); + } } - -# ---------------------------------- Should this file have been part of a page? - $thisfn=&Apache::lonnet::declutter($thisfn); - my %hash; - my $syval=''; - - if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db', - &GDBM_READER,0640)) { - $syval=$hash{$thisfn}; - untie(%hash); - } - -# ---------------------------------------------------------- There was an entry - - if ($syval) { - - if ($syval=~/\_$/) { -# ----------------------------------- Okay, this should have appeared on a page - $syval=~s/\_\_\_$//; - $r->content_type('text/html'); - $r->header_out(Location => - 'http://'.$ENV{'HTTP_HOST'}.'/res/'.$syval); - return REDIRECT; +# now either disurl is set (going to first page), or we need another display + if ($disurl) { +# -------------------------------------------------- Has first or last resource + &Apache::lonnet::symblist($requrl,$disurl => [$disurl,$dismapid], + 'last_known' => [$disurl,$dismapid]); + &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'); + $r->send_http_header; + if ($exitdisid eq '' && $arrow_dir ne '') { + my %lt =&Apache::lonlocal::texthash( + 'back' => 'beginning', + 'forward' => 'end', + 'nere' => 'Next resource could not be displayed', + 'goba' => 'Go Back', + 'nacc' => 'Navigate Course Content', + ); + my $warnmsg = &mt('As all folders and sequences '); + if ($arrow_dir eq 'forward') { + $warnmsg .= &mt('following the current resource were empty').','; + } elsif ($arrow_dir eq 'back') { + $warnmsg .= &mt('preceding the current resource were empty').','; + } + $warnmsg .= &mt('you have now reached the').' '.$lt{$arrow_dir}.' '.&mt('of the course.'); + my $start_page= + &Apache::loncommon::start_page('Empty Folder/Sequence'); + my $end_page= + &Apache::loncommon::end_page(); + $r->print(<$lt{'nere'} +

$warnmsg

+ +$end_page +ENDNONE } else { -# There is not really a problem (???), but cannot go back without endless loop - &getlost($r,'The nature of the problem is unclear'); - return OK; + &viewmap($r,$requrl); } - } - -# ------------------------------------------------ Would be standalone resource - - if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db', - &GDBM_READER,0640)) { -# ---------------------------------------------- Get ID(s) for current resource - my $ids=$bighash{'ids_/res/'.$thisfn}; - if ($ids) { -# ------------------------------------------------------------------- Has ID(s) - my @possibilities=split(/\,/,$ids); - my $couldbe=''; - map { - if (&Apache::lonnet::allowed('bre',$bighash{'src_'.$_})) { - if ($couldbe) { - $couldbe.=','.$_; - } else { - $couldbe=$_; - } - } - } @possibilities; - if ($couldbe) { - @possibilities=split(/\,/,$couldbe); - if ($#possibilities>0) { -# ----------------------------------------------- Okay, really multiple choices - $r->content_type('text/html'); - $r->send_http_header; - $r->print(<Choose Location - -

LON-CAPA

-The resource you had been accessing appears more than once in this course, -and LON-CAPA has insufficient session information to determine which instance -of the resource you meant. -

-Please click on the instance of the resource you intended to access: -

-

- - - - -ENDSTART - map { - my $mapurl=$bighash{'map_id_'.(split(/\./,$_))[0]}; - $r->print(''); - } @possibilities; - $r->print('
 TitleTypePart of ...
'.$bighash{'title_'.$_}. - ''.$bighash{'type_'.$_}. - ''.$mapurl. - '
'); - untie(%bighash); - return OK; - } - } - } - untie(%bighash); - } - -# ------------------------------------ This handler should not have been called - &getlost($r,'Invalid call of handler'); - return OK; + return OK; + } } 1; 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.