--- rat/lonambiguous.pm 2000/10/12 02:14:01 1.1 +++ rat/lonambiguous.pm 2012/10/04 12:40:29 1.24 @@ -1,11 +1,32 @@ # The LearningOnline Network with CAPA # Handler to resolve ambiguous file locations # -# (TeX Content Handler +# $Id: lonambiguous.pm,v 1.24 2012/10/04 12:40:29 bisitz Exp $ # -# 05/29/00,05/30,10/11 Gerd Kortemeyer) +# Copyright Michigan State University Board of Trustees # -# 10/11 Gerd Kortemeyer +# 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/ +# + + package Apache::lonambiguous; @@ -13,34 +34,85 @@ use strict; use Apache::lonnet; use Apache::Constants qw(:common REDIRECT); use GDBM_File; +use Apache::loncommon; +use Apache::lonlocal; +my %bighash; + +sub cleanup { + if (tied(%bighash)){ + &Apache::lonnet::logthis('Cleanup ambiguous: bighash'); + unless (untie(%bighash)) { + &Apache::lonnet::logthis('Failed cleanup ambiguous: bighash'); + } + } + return OK; +} # ----------------------------------------------------------- Could not resolve sub getlost { - my $r=shift; - $r->content_type('text/html'); + my ($r,$errmsg)=@_; + $errmsg=&mt($errmsg); + &Apache::loncommon::content_type($r,'text/html'); $r->send_http_header; - $r->print('Unknown Error'. - '

LON-CAPA

Could not handle ambiguous file reference.'); + $r->print(&Apache::loncommon::start_page('Could not handle ambiguous resource reference'). + $errmsg. + &Apache::loncommon::end_page()); } # ================================================================ Main Handler +sub make_symb { + my ($id)=@_; + my ($mapid,$resid)=split(/\./,$id); + my $map=$bighash{'map_id_'.$mapid}; + my $res=$bighash{'src_'.$id}; + my $symb=&Apache::lonnet::encode_symb($map,$resid,$res); + return $symb; +} + sub handler { my $r=shift; if ($r->header_only) { - $r->content_type('text/html'); + &Apache::loncommon::content_type($r,'text/html'); $r->send_http_header; return OK; } +# ---------------------------------------------------------- Is this selecting? + + if ($env{'form.selecturl'}) { + my $envkey; + if (tie(%bighash,'GDBM_File',$env{'request.course.fn'}.'.db', + &GDBM_READER(),0640)) { + foreach $envkey (keys %env) { + if ($envkey=~/^form\.(\d+)\.(\d+)$/) { +# ---------------------------------------------------- Update symb and redirect + my $mapid=$1; + my $resid=$2; + my $resurl=$bighash{'src_'.$mapid.'.'.$resid}; + &Apache::lonnet::symblist($bighash{'map_id_'.$mapid}, + $resurl => [$resurl,$resid]); + untie(%bighash); + $r->header_out(Location => + &Apache::lonnet::absolute_url().$resurl); + return REDIRECT; + } + } + untie(%bighash); + } else { + &getlost($r,'Could not access course structure.'); + return OK; + } + } + # ---------------------------------------------------------- Do we have a case? my $thisfn; - unless (($thisfn=$ENV{'request.ambiguous'})&&($ENV{'request.course.fn'})) { - getlost($r); + unless (($thisfn=$env{'request.ambiguous'})&&($env{'request.course.fn'})) { + &getlost($r,'Could not find information on resource.'); return OK; } @@ -48,59 +120,117 @@ sub handler { $thisfn=&Apache::lonnet::declutter($thisfn); my %hash; - my %bighash; my $syval=''; - if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db', - &GDBM_READER,0640)) { + 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 ($syval=~/\_$/) { + my ($page,undef,$res)=&Apache::lonnet::decode_symb($syval); + if ($res eq 'page') { # ----------------------------------- Okay, this should have appeared on a page - $syval=~s/\_\_\_$//; - $r->content_type('text/html'); + &Apache::loncommon::content_type($r,'text/html'); $r->header_out(Location => - 'http://'.$ENV{'HTTP_HOST'}.'/res/'.$syval); + &Apache::lonnet::absolute_url(). + &Apache::lonnet::clutter($page)); return REDIRECT; } else { # There is not really a problem (???), but cannot go back without endless loop - getlost($r); + &getlost($r,'The nature of the problem is unclear'); return OK; } } - +# ------------------------------------Encrypted requests go straight to navmaps + if ($env{'request.enc'}) { + &Apache::loncommon::content_type($r,'text/html'); + $r->header_out(Location => + &Apache::lonnet::absolute_url().'/adm/navmaps'); + return REDIRECT; + } # ------------------------------------------------ Would be standalone resource - if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db', - &GDBM_READER,0640)) { + 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}; + my $ids=$bighash{'ids_'.&Apache::lonnet::clutter($thisfn)}; if ($ids) { # ------------------------------------------------------------------- Has ID(s) my @possibilities=split(/\,/,$ids); my $couldbe=''; - map { - if (&allowed('bre',$bighash{'src_'.$_})) { + foreach (@possibilities) { + if ($bighash{'encrypted_'.$_}) { next; } + my $symb=&make_symb($_); + if (&Apache::lonnet::allowed('bre',$bighash{'src_'.$_},$symb)) { if ($couldbe) { $couldbe.=','.$_; } else { $couldbe=$_; } } - } @possibilities; + } if ($couldbe) { @possibilities=split(/\,/,$couldbe); + if ($#possibilities==0) { + my $id=$possibilities[0]; + my $resurl=$bighash{'src_'.$id}; + my $mapurl=$bighash{'map_id_'.(split(/\./,$id))[0]}; + my $symb=&make_symb($id); + &Apache::loncommon::content_type($r,'text/html'); + $r->header_out(Location => + &Apache::lonnet::absolute_url(). + $resurl.'?symb='.$symb); + return REDIRECT; + } if ($#possibilities>0) { # ----------------------------------------------- Okay, really multiple choices - $r->content_type('text/html'); + &Apache::loncommon::content_type($r,'text/html'); $r->send_http_header; + my $start_page= + &Apache::loncommon::start_page('Pick Instance of Resource'); + $r->print( + $start_page + .'

' + .&mt('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.') + .'

' + .'

' + .&mt('Please click on the instance of the resource you' + .' intended to access:') + .'

' + ); $r->print( - 'Choose Location'. - '

LON-CAPA

Cool.'); - untie(%bighash); + &Apache::loncommon::start_data_table() + .&Apache::loncommon::start_data_table_header_row() + .''.&mt('Title').'' + .''.&mt('Part of ...').'' + .&Apache::loncommon::end_data_table_header_row() + .&Apache::loncommon::start_data_table_row() + ); + map { + my $resurl=$bighash{'src_'.$_}; + my $mapurl=$bighash{'map_id_'.(split(/\./,$_))[0]}; + my $symb=&make_symb($_); + $r->print( + &Apache::loncommon::start_data_table_row() + .'' + .&Apache::lonnet::gettitle($symb) + .'' + .''.&Apache::lonnet::gettitle($mapurl).' ' + .&Apache::loncommon::end_data_table_row() + ); + } @possibilities; + $r->print( + &Apache::loncommon::end_data_table() + .&Apache::loncommon::end_page() + ); + untie(%bighash); return OK; } } @@ -109,7 +239,7 @@ sub handler { } # ------------------------------------ This handler should not have been called - getlost($r); + &getlost($r,'Invalid call of handler'); return OK; } @@ -118,6 +248,40 @@ __END__ +=head1 NAME + +Apache::lonambiguous + +=head1 SYNOPSIS + +Handler to resolve ambiguous file locations. + +This is part of the LearningOnline Network with CAPA project +described at http://www.lon-capa.org. + +=head1 HANDLER SUBROUTINE + +make_symb() + +and + +handler() + +=head1 OTHER SUBROUTINES + +=over + +=item * + +cleanup() + +=item * + +getlost() + +=back + +=cut