version 1.2, 2000/10/16 21:09:33
|
version 1.22, 2005/02/17 09:09:57
|
Line 2
|
Line 2
|
# |
# |
# Sequence Handler |
# Sequence Handler |
# |
# |
# (Handler to resolve ambiguous file locations |
# $Id$ |
|
# |
|
# 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 |
# |
# |
# (TeX Content Handler |
# /home/httpd/html/adm/gpl.txt |
# |
# |
# 05/29/00,05/30,10/11 Gerd Kortemeyer) |
# http://www.lon-capa.org/ |
# |
# |
# 10/11,10/12 Gerd Kortemeyer) |
# (Handler to resolve ambiguous file locations |
# |
# |
# 10/16 Gerd Kortemeyer |
|
|
|
package Apache::lonambiguous; |
package Apache::lonsequence; |
|
|
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; |
|
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 |
|
|
# ----------------------------------------------------------- Could not resolve |
sub viewmap { |
|
my ($r,$url)=@_; |
|
$r->print('<html>'); |
|
if ($ENV{'form.forceselect'}) { $r->print(<<ENDSCRIPT); |
|
<script> |
|
|
|
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'; |
|
} |
|
} |
|
|
|
</script> |
|
ENDSCRIPT |
|
} |
|
$r->print(&Apache::loncommon::bodytag('Map Contents').'<h1>'.$url.'</h1>'); |
|
# ------------------ This is trying to select. Provide buttons and tie %selhash |
|
if ($ENV{'form.forceselect'}) { $r->print(<<ENDSELECT); |
|
<form name=fileattr><input type=hidden name=acts value=''> |
|
<input type="button" name="close" value='CLOSE' onClick="self.close()"> |
|
<input type="button" name="groupimport" value='GROUP IMPORT' |
|
onClick="javascript:select_group()"> |
|
</form> |
|
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('<p><b><font color="red">'.&mt('Map contents are not shown in order.').'</font></b></p><br />'); |
|
} |
|
my $idx=0; |
|
foreach (&attemptread(&Apache::lonnet::filelocation('',$url))) { |
|
if (defined($_)) { |
|
$idx++; |
|
if ($successtied) { |
|
$r->print('<form name="form'.$idx.'">'); |
|
} |
|
my ($title,$url)=split(/\:/,$_); |
|
$title=~s/\&colon\;/\:/g; |
|
$url=~s/\&colon\;/\:/g; |
|
unless ($title) { $title=(split(/\//,$url))[-1] }; |
|
unless ($title) { $title='<i>'.&mt('Empty').'</i>'; } |
|
if ($url) { |
|
if ($successtied) { |
|
my $checked=''; |
|
if ($selhash{'store_'.$url}) { |
|
$checked=" checked"; |
|
} |
|
$selhash{"pre_${idx}_link"}=$url; |
|
$selhash{"pre_${idx}_title"}=$title; |
|
|
|
$r->print(<<ENDCHECKBOX); |
|
<input type='checkbox' name='filelink' |
|
value='$url' onClick='javascript:queue("form$idx")'$checked> |
|
<input type='hidden' name='title' value='$title'> |
|
ENDCHECKBOX |
|
} |
|
$r->print('<a href="'.&Apache::lonratsrv::qtescape($url).'">'); |
|
} |
|
$r->print(&Apache::lonratsrv::qtescape($title)); |
|
if ($url) { $r->print('</a>'); } |
|
if ($successtied) { |
|
$r->print('</form>'); |
|
} else { |
|
$r->print('<br>'); |
|
} |
|
} |
|
} |
|
$r->print('</body></html>'); |
|
if ($successtied) { |
|
untie %selhash; |
|
} |
|
} |
|
|
sub getlost { |
# ----------------------------------------------------------- Clean out selhash |
my ($r,$errmsg)=@_; |
sub start_fresh_session { |
$r->content_type('text/html'); |
foreach (keys %selhash) { |
$r->send_http_header; |
if ($_ =~ /^pre_/) { |
$r->print( |
delete $selhash{$_}; |
'<head><title>Unknown Error</title></head><body bgcolor="#FFFFFF"><h1>'. |
} |
'LON-CAPA</h1>Could not handle ambiguous resource reference.<p>'.$errmsg. |
if ($_ =~ /^store/) { |
'</body></html>'); |
delete $selhash{$_}; |
|
} |
|
} |
} |
} |
|
|
|
|
# ================================================================ Main Handler |
# ================================================================ Main Handler |
|
|
sub handler { |
sub handler { |
my $r=shift; |
my $r=shift; |
|
|
if ($r->header_only) { |
if ($r->header_only) { |
$r->content_type('text/html'); |
&Apache::loncommon::content_type($r,'text/html'); |
$r->send_http_header; |
$r->send_http_header; |
return OK; |
return OK; |
} |
} |
|
|
|
&Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'}, |
|
['forceselect','launch']); |
|
|
my %hash; |
my %hash; |
my %bighash; |
my %bighash; |
my $requrl=$r->uri; |
my $requrl=$r->uri; |
|
|
# ----------------------------------------------------------------- Tie db file |
$successtied=0; |
if ($ENV{'request.course.fn'}) { |
# ------------------------------------------------------------ Tie symb db file |
|
my $disurl=''; |
|
my $dismapid=''; |
|
my $exitdisid = ''; |
|
my $arrow_dir = ''; |
|
|
|
if (($ENV{'request.course.fn'}) && (!$ENV{'form.forceselect'})) { |
my $last; |
my $last; |
if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db', |
if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db', |
&GDBM_READER,0640)) { |
&GDBM_READER(),0640)) { |
$last=$hash{'last_direction'}; |
$last=$hash{'last_direction'}; |
untie(%hash); |
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', |
if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db', |
&GDBM_READER,0640)) { |
&GDBM_READER(),0640)) { |
my $direction=''; |
my $disid=''; |
my $prevmap=''; |
my $randomout =''; |
if ($last) { |
|
($prevmap,$direction)=(split(/\_\_\_/,$last)); |
if ($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}; |
|
} elsif (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db', |
|
&GDBM_READER(),0640)) { |
|
$last=$hash{'last_known'}; |
|
untie(%hash); |
} |
} |
|
|
# ===== Stuff goes here |
|
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 |
|
|
|
# ---------------------------------------------------------- Do we have a case? |
# ----------- 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]; |
|
$randomout = $bighash{'randomout_'.$disid}; |
|
} |
|
} |
|
$exitdisid = $disid; |
|
$arrow_dir = $direction; |
|
|
my $thisfn; |
# --------------------------------------- Untie hash, make sure to come by here |
unless (($thisfn=$ENV{'request.ambiguous'})&&($ENV{'request.course.fn'})) { |
untie(%bighash); |
&getlost($r,'Could not find information on resource.'); |
} |
return OK; |
|
} |
} |
|
|
# ---------------------------------- Should this file have been part of a page? |
|
|
|
$thisfn=&Apache::lonnet::declutter($thisfn); |
# now either disurl is set (going to first page), or we need another display |
my %hash; |
if ($disurl) { |
my $syval=''; |
# -------------------------------------------------- Has first or last resource |
|
&Apache::lonnet::symblist($requrl,$disurl => $dismapid, |
if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db', |
'last_known' => &Apache::lonnet::declutter($disurl)); |
&GDBM_READER,0640)) { |
&Apache::loncommon::content_type($r,'text/html'); |
$syval=$hash{$thisfn}; |
$r->header_out(Location => 'http://'.$ENV{'HTTP_HOST'}.$disurl); |
untie(%hash); |
return REDIRECT; |
} |
} else { |
|
&Apache::loncommon::content_type($r,'text/html'); |
# ---------------------------------------------------------- There was an entry |
$r->send_http_header; |
|
if ($exitdisid eq '' && $arrow_dir ne '') { |
if ($syval) { |
my %lt =&Apache::lonlocal::texthash( |
|
'back' => 'beginning', |
if ($syval=~/\_$/) { |
'forward' => 'end', |
# ----------------------------------- Okay, this should have appeared on a page |
'emfo' => 'Empty Folder/Sequence', |
$syval=~s/\_\_\_$//; |
'nere' => 'Next resource could not be displayed', |
$r->content_type('text/html'); |
'goba' => 'Go Back', |
$r->header_out(Location => |
'nacc' => 'Navigate Course Content', |
'http://'.$ENV{'HTTP_HOST'}.'/res/'.$syval); |
); |
return REDIRECT; |
my $warnmsg = 'As all folders and sequences '; |
|
if ($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 $bodytag=&Apache::loncommon::bodytag('Empty Folder/Sequence'); |
|
$r->print(<<ENDNONE); |
|
<head><title>$lt{'emfo'}</title></head> |
|
$bodytag |
|
<h3>$lt{'nere'}</h3> |
|
<p>$warnmsg</p> |
|
<ul> |
|
<li><a href="javascript:history.go(-1)">$lt{'goba'}</a></li> |
|
<li><a href="/adm/navmaps">$lt{'nacc'}</a></li> |
|
</ul> |
|
</body> |
|
</html> |
|
ENDNONE |
} else { |
} else { |
# There is not really a problem (???), but cannot go back without endless loop |
&viewmap($r,$requrl); |
&getlost($r,'The nature of the problem is unclear'); |
|
return OK; |
|
} |
} |
} |
return OK; |
|
} |
# ------------------------------------------------ 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; |
|
$r->print(<<ENDSTART); |
|
<head><title>Choose Location</title></head> |
|
<body bgcolor="#FFFFFF"> |
|
<h1>LON-CAPA</h1> |
|
The resource you had been accessing appears more than once in this course, |
|
and LON-CAPA has insufficient session information to determine which instance |
|
of the resource you meant. |
|
<p> |
|
Please click on the instance of the resource you intended to access: |
|
<p> |
|
<form action="/adm/ambiguous" method=post> |
|
<input type=hidden name=orgurl value="$thisfn"> |
|
<input type=hidden name=selecturl value=1> |
|
<table border=2> |
|
<tr><th> </th><th>Title</th><th>Type</th><th>Part of ...</th></tr> |
|
ENDSTART |
|
map { |
|
my $mapurl=$bighash{'map_id_'.(split(/\./,$_))[0]}; |
|
$r->print('<tr><td><input type=submit value=Select name="'. |
|
$_.'"></td><td>'.$bighash{'title_'.$_}. |
|
'</td><td>'.$bighash{'type_'.$_}. |
|
'</td><td><a href="'.$mapurl.'">'.$mapurl. |
|
'</a></td></tr>'); |
|
} @possibilities; |
|
$r->print('</table></form></body></html>'); |
|
untie(%bighash); |
|
return OK; |
|
} |
|
} |
|
} |
|
untie(%bighash); |
|
} |
|
|
|
# ------------------------------------ This handler should not have been called |
|
&getlost($r,'Invalid call of handler'); |
|
return OK; |
|
} |
} |
|
|
1; |
1; |