version 1.1, 2000/10/16 20:47:39
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version 1.42, 2012/12/16 17:48:39
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# |
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# Sequence Handler |
# Sequence Handler |
# |
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# (Handler to resolve ambiguous file locations |
# $Id$ |
# |
# |
# (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 |
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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/ |
# |
# |
# 10/16 Gerd Kortemeyer |
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package Apache::lonambiguous; |
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package Apache::lonsequence; |
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use strict; |
use strict; |
use Apache::lonnet; |
use Apache::lonnet; |
use Apache::Constants qw(:common REDIRECT); |
use Apache::Constants qw(:common :http REDIRECT); |
use GDBM_File; |
use GDBM_File; |
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use LONCAPA::map(); |
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use LONCAPA; |
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use Apache::lonpageflip(); |
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use Apache::loncommon(); |
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use Apache::groupsort(); |
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use Apache::lonlocal; |
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use HTML::Entities(); |
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my %selhash; |
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my $successtied; |
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# ----------------------------------------- Attempt to read from resource space |
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sub attemptread { |
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my ($fn,$unsorted)=@_; |
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&Apache::lonnet::repcopy($fn); |
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if (-e $fn) { |
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return &LONCAPA::map::attemptread($fn,$unsorted); |
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} else { |
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return (); |
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} |
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} |
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sub mapread { |
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my $fn=shift; |
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&Apache::lonnet::repcopy($fn); |
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if (-e $fn) { |
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return &LONCAPA::map::mapread($fn,''); |
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} else { |
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return (); |
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} |
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} |
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# ---------------------------------------------------------------- View Handler |
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sub viewmap { |
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my ($r,$url)=@_; |
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my $js; |
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if ($env{'form.forceselect'}) { |
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$js = (<<ENDSCRIPT); |
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<script type="text/javascript"> |
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function select_group() { |
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window.location="/adm/groupsort?catalogmode=groupsec&mode=rat&acts="+document.forms.fileattr.acts.value; |
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} |
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function queue(val) { |
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if (eval("document.forms."+val+".filelink.checked")) { |
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var l=val.length; |
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var v=val.substring(4,l); |
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document.forms.fileattr.acts.value+='1a'+v+'b'; |
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} |
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else { |
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var l=val.length; |
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var v=val.substring(4,l); |
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document.forms.fileattr.acts.value+='0a'+v+'b'; |
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} |
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} |
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# ----------------------------------------------------------- Could not resolve |
</script> |
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ENDSCRIPT |
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} |
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sub getlost { |
$r->print(&Apache::loncommon::start_page('Map Contents',$js). |
my ($r,$errmsg)=@_; |
'<h1>'.$url.'</h1>'); |
$r->content_type('text/html'); |
# ------------------ This is trying to select. Provide buttons and tie %selhash |
$r->send_http_header; |
if ($env{'form.forceselect'}) { $r->print(<<ENDSELECT); |
$r->print( |
<form name="fileattr"><input type="hidden" name="acts" value="" /> |
'<head><title>Unknown Error</title></head><body bgcolor="#FFFFFF"><h1>'. |
<input type="button" name="close" value="CLOSE" onClick="self.close()" /> |
'LON-CAPA</h1>Could not handle ambiguous resource reference.<p>'.$errmsg. |
<input type="button" name="groupimport" value="GROUP IMPORT" |
'</body></html>'); |
onClick="javascript:select_group()" /> |
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</form> |
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ENDSELECT |
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my $diropendb = |
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LONCAPA::tempdir() . |
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"$env{'user.domain'}\_$env{'user.name'}_sel_res.db"; |
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if (tie(%selhash,'GDBM_File',$diropendb,&GDBM_WRCREAT(),0640)) { |
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if ($env{'form.launch'} eq '1') { |
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&start_fresh_session(); |
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} |
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$successtied=1; |
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# - Evaluate actions from previous page (both cumulatively and chronologically) |
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if ($env{'form.catalogmode'} eq 'import') { |
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&Apache::groupsort::update_actions_hash(\%selhash); |
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} |
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# - |
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} |
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} |
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# ----------------------------- successtied is now '1' if in working selectmode |
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my ($errtext,$fatal)=&mapread(&Apache::lonnet::filelocation('',$url),''); |
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if ($fatal==1) { |
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$r->print('<p class="LC_warning">' |
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.&mt('Map contents are not shown in order.') |
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.'</p><br />'); |
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} |
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my $idx=0; |
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foreach (&attemptread(&Apache::lonnet::filelocation('',$url))) { |
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if (defined($_)) { |
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$idx++; |
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if ($successtied) { |
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$r->print('<form name="form'.$idx.'">'); |
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} |
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my ($title,$url)=split(/\:/,$_); |
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$title = &LONCAPA::map::qtescape($title); |
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unless ($title) { $title=(split(/\//,$url))[-1] }; |
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my $enc_title = &HTML::Entities::encode($title,'\'"<>&'); |
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unless ($title) { |
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$title='<i>'.&mt('Empty').'</i>'; |
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$enc_title = &mt('Empty'); |
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} |
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$url = &LONCAPA::map::qtescape($url); |
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my $enc_url = &HTML::Entities::encode($url,'\'"<>&'); |
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if ($url) { |
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if ($successtied) { |
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my $checked=''; |
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if ($selhash{'store_'.$url}) { |
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$checked=' checked="checked"'; |
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} |
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$selhash{"pre_${idx}_link"}=$url; |
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$selhash{"pre_${idx}_title"}=$title; |
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$url = &HTML::Entities::encode($url, '\'"<>&'); |
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$r->print(<<ENDCHECKBOX); |
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<input type='checkbox' name='filelink' |
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value='$enc_url' onClick='javascript:queue("form$idx")'$checked /> |
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<input type='hidden' name='title' value='$enc_title' /> |
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ENDCHECKBOX |
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} |
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$r->print('<a href="'.$enc_url.'">'); |
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} |
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$r->print($enc_title); |
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if ($url) { $r->print('</a>'); } |
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if ($successtied) { |
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$r->print('</form>'); |
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} else { |
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$r->print('<br />'); |
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} |
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} |
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} |
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$r->print(&Apache::loncommon::end_page()); |
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if ($successtied) { |
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untie %selhash; |
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} |
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} |
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# ----------------------------------------------------------- Clean out selhash |
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sub start_fresh_session { |
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foreach (keys %selhash) { |
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if ($_ =~ /^pre_/) { |
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delete $selhash{$_}; |
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} |
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if ($_ =~ /^store/) { |
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delete $selhash{$_}; |
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} |
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} |
} |
} |
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# ================================================================ Main Handler |
# ================================================================ Main Handler |
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sub handler { |
sub handler { |
my $r=shift; |
my $r=shift; |
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if ($r->header_only) { |
if ($r->header_only) { |
$r->content_type('text/html'); |
&Apache::loncommon::content_type($r,'text/html'); |
$r->send_http_header; |
$r->send_http_header; |
return OK; |
return OK; |
} |
} |
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&Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'}, |
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['forceselect','launch']); |
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my %hash; |
my %bighash; |
my %bighash; |
# ----------------------------------------------------------------- Tie db file |
my $requrl=$r->uri; |
if ($ENV{'request.course.fn'}) { |
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my $envkey; |
$successtied=0; |
if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db', |
# ------------------------------------------------------------ Tie symb db file |
&GDBM_READER,0640)) { |
my $disurl=''; |
foreach $envkey (keys %ENV) { |
my $dismapid=''; |
if ($envkey=~/^form\.(\d+)\.(\d+)$/) { |
my $exitdisid = ''; |
my $mapid=$1; |
my $arrow_dir = ''; |
my $resid=$2; |
my $is_encrypted = ''; |
my $resurl=$bighash{'src_'.$mapid.'.'.$resid}; |
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&Apache::lonnet::symblist($bighash{'map_id_'.$mapid}, |
if (($env{'request.course.fn'}) && (!$env{'form.forceselect'})) { |
$resurl => $resid); |
my $last; |
$r->header_out(Location => |
if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db', |
'http://'.$ENV{'HTTP_HOST'}.$resurl); |
&GDBM_READER(),0640)) { |
return REDIRECT; |
$last=$hash{'last_direction'}; |
} |
untie(%hash); |
} |
} |
untie(%bighash); |
my $direction=''; |
} else { |
my $prevmap=''; |
&getlost($r,'Could not access course structure.'); |
if ($last) { |
return OK; |
($prevmap,undef,$direction)=&Apache::lonnet::decode_symb($last); |
} |
} |
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# ------------------------------------------------------------- Tie big db file |
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if (tie(%bighash,'GDBM_File',$env{'request.course.fn'}.'.db', |
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&GDBM_READER(),0640)) { |
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my $disid=''; |
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my $randomout =''; |
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if ($direction eq 'back') { |
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$disid=$bighash{'map_finish_'.$requrl}; |
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} else { |
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$disid=$bighash{'map_start_'.$requrl}; |
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} |
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if ($disid) { |
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$disurl=$bighash{'src_'.$disid}; |
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$dismapid=(split(/\./,$disid))[1]; |
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if (!$env{'request.role.adv'}) { |
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$randomout = $bighash{'randomout_'.$disid}; |
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} |
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if (!$env{'request.role.adv'}) { |
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$is_encrypted = $bighash{'encrypted_'.$disid}; |
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} |
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} elsif (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db', |
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&GDBM_READER(),0640)) { |
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$last=$hash{'last_known'}; |
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untie(%hash); |
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} |
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# ----------- If this is an empty one, or hidden, skip to next non-empty or non-hidden one |
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while ( ((!$disurl) && ($disid)) || ($randomout && $disid) ) { |
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$direction=($direction?$direction:'forward'); |
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($disid,$requrl)= |
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&Apache::lonpageflip::fullmove($disid, |
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&Apache::lonnet::declutter($requrl),$direction); |
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if ($disid) { |
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$disurl=$bighash{'src_'.$disid}; |
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$dismapid=(split(/\./,$disid))[1]; |
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if (!$env{'request.role.adv'}) { |
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$randomout = $bighash{'randomout_'.$disid}; |
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} |
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if (!$env{'request.role.adv'}) { |
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$is_encrypted = $bighash{'encrypted_'.$disid}; |
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} |
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} |
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} |
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$exitdisid = $disid; |
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$arrow_dir = $direction; |
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# --------------------------------------- Untie hash, make sure to come by here |
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untie(%bighash); |
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} |
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} |
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# now either disurl is set (going to first page), or we need another display |
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if ($disurl) { |
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# -------------------------------------------------- Has first or last resource |
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my $showdisurl = $disurl; |
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if ($is_encrypted) { |
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$showdisurl = &Apache::lonenc::encrypted($disurl); |
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} |
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&Apache::lonnet::symblist($requrl,$disurl => [$disurl,$dismapid], |
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'last_known' => [$disurl,$dismapid]); |
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&Apache::loncommon::content_type($r,'text/html'); |
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$r->header_out(Location => &Apache::lonnet::absolute_url($ENV{'SERVER_NAME'}). |
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$showdisurl); |
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return REDIRECT; |
} else { |
} else { |
$ENV{'user.error.msg'}="$requrl:bre:0:0:Course not initialized"; |
&Apache::loncommon::content_type($r,'text/html'); |
return HTTP_NOT_ACCEPTABLE; |
$r->send_http_header; |
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if ($exitdisid eq '' && $arrow_dir ne '') { |
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my %lt =&Apache::lonlocal::texthash( |
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'nere' => 'Next resource could not be displayed', |
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'goba' => 'Go Back', |
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'nacc' => 'Navigate Course Content', |
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); |
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my $warnmsg; |
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if ($arrow_dir eq 'forward') { |
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$warnmsg = &mt('As all folders and sequences ' |
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.'following the current resource were empty, ' |
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.'you have now reached the end of the course.'); |
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} elsif ($arrow_dir eq 'back') { |
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$warnmsg = &mt('As all folders and sequences '. |
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.'preceding the current resource were empty, ' |
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.'you have now reached the beginning of the course.'); |
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} |
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my $start_page= |
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&Apache::loncommon::start_page('Empty Folder/Sequence'); |
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my $end_page= |
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&Apache::loncommon::end_page(); |
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$r->print(<<ENDNONE); |
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$start_page |
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<h3>$lt{'nere'}</h3> |
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<p>$warnmsg</p> |
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<ul> |
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<li><a href="javascript:history.go(-1)">$lt{'goba'}</a></li> |
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<li><a href="/adm/navmaps">$lt{'nacc'}</a></li> |
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</ul> |
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$end_page |
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ENDNONE |
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} else { |
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&viewmap($r,$requrl); |
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} |
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return OK; |
} |
} |
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} |
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return OK; |
1; |
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__END__ |
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# ================================================================= TRASH BELOW |
=head1 NAME |
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# ---------------------------------------------------------- Do we have a case? |
Apache::lonsequence |
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my $thisfn; |
=head1 SYNOPSIS |
unless (($thisfn=$ENV{'request.ambiguous'})&&($ENV{'request.course.fn'})) { |
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&getlost($r,'Could not find information on resource.'); |
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return OK; |
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} |
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# ---------------------------------- Should this file have been part of a page? |
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$thisfn=&Apache::lonnet::declutter($thisfn); |
Handler for showing sequence objects of |
my %hash; |
educational resources. |
my $syval=''; |
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if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db', |
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&GDBM_READER,0640)) { |
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$syval=$hash{$thisfn}; |
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untie(%hash); |
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} |
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# ---------------------------------------------------------- There was an entry |
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if ($syval) { |
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if ($syval=~/\_$/) { |
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# ----------------------------------- Okay, this should have appeared on a page |
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$syval=~s/\_\_\_$//; |
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$r->content_type('text/html'); |
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$r->header_out(Location => |
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'http://'.$ENV{'HTTP_HOST'}.'/res/'.$syval); |
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return REDIRECT; |
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} else { |
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# There is not really a problem (???), but cannot go back without endless loop |
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&getlost($r,'The nature of the problem is unclear'); |
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return OK; |
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} |
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} |
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# ------------------------------------------------ Would be standalone resource |
This is part of the LearningOnline Network with CAPA project |
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described at http://www.lon-capa.org. |
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if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db', |
=head1 SUBROUTINES |
&GDBM_READER,0640)) { |
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# ---------------------------------------------- Get ID(s) for current resource |
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my $ids=$bighash{'ids_/res/'.$thisfn}; |
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if ($ids) { |
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# ------------------------------------------------------------------- Has ID(s) |
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my @possibilities=split(/\,/,$ids); |
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my $couldbe=''; |
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map { |
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if (&Apache::lonnet::allowed('bre',$bighash{'src_'.$_})) { |
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if ($couldbe) { |
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$couldbe.=','.$_; |
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} else { |
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$couldbe=$_; |
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} |
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} |
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} @possibilities; |
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if ($couldbe) { |
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@possibilities=split(/\,/,$couldbe); |
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if ($#possibilities>0) { |
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# ----------------------------------------------- Okay, really multiple choices |
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$r->content_type('text/html'); |
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$r->send_http_header; |
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$r->print(<<ENDSTART); |
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<head><title>Choose Location</title></head> |
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<body bgcolor="#FFFFFF"> |
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<h1>LON-CAPA</h1> |
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The resource you had been accessing appears more than once in this course, |
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and LON-CAPA has insufficient session information to determine which instance |
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of the resource you meant. |
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<p> |
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Please click on the instance of the resource you intended to access: |
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<p> |
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<form action="/adm/ambiguous" method=post> |
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<input type=hidden name=orgurl value="$thisfn"> |
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<input type=hidden name=selecturl value=1> |
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<table border=2> |
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<tr><th> </th><th>Title</th><th>Type</th><th>Part of ...</th></tr> |
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ENDSTART |
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map { |
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my $mapurl=$bighash{'map_id_'.(split(/\./,$_))[0]}; |
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$r->print('<tr><td><input type=submit value=Select name="'. |
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$_.'"></td><td>'.$bighash{'title_'.$_}. |
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'</td><td>'.$bighash{'type_'.$_}. |
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'</td><td><a href="'.$mapurl.'">'.$mapurl. |
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'</a></td></tr>'); |
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} @possibilities; |
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$r->print('</table></form></body></html>'); |
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untie(%bighash); |
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return OK; |
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} |
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} |
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} |
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untie(%bighash); |
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} |
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# ------------------------------------ This handler should not have been called |
=over |
&getlost($r,'Invalid call of handler'); |
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return OK; |
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} |
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1; |
=item handler() |
__END__ |
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=item viewmap() |
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=item attemptread() |
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=item mapread() |
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=item start_fresh_session() |
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=back |
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=cut |
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