# The LearningOnline Network with CAPA
# Page Handler
#
# $Id: lonpage.pm,v 1.42 2002/06/27 18:48:30 sakharuk 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/
#
# (TeX Content Handler
#
# YEAR=2000
# 05/29/00,05/30 Gerd Kortemeyer)
# 08/30,08/31,09/06,09/14,09/15,09/16,09/19,09/20,09/21,09/23,
# 10/02,10/10,10/14,10/16,10/18,10/19,10/31,11/6,11/14,11/16,
# YEAR=2001
# 08/13/01,08/30,10/1 Gerd Kortemeyer
# 12/16 Scott Harrison
# YEAR=2002
# 03/19 Gerd Kortemeyer
#
###
package Apache::lonpage;
use strict;
use Apache::Constants qw(:common :http);
use Apache::lonnet();
use Apache::loncommon();
use Apache::lonxml();
use HTML::TokeParser;
use GDBM_File;
use Apache::lonsequence;
# -------------------------------------------------------------- Module Globals
my %hash;
my @rows;
# ------------------------------------------------------------------ Euclid gcd
sub euclid {
my ($e,$f)=@_;
my $a; my $b; my $r;
if ($e>$f) { $b=$e; $r=$f; } else { $r=$e; $b=$f; }
while ($r!=0) {
$a=$b; $b=$r;
$r=$a%$b;
}
return $b;
}
# ------------------------------------------------------------ Build page table
sub tracetable {
my ($sofar,$rid,$beenhere)=@_;
my $further=$sofar;
unless ($beenhere=~/\&$rid\&/) {
$beenhere.=$rid.'&';
if (defined($hash{'is_map_'.$rid})) {
if ((defined($hash{'map_start_'.$hash{'src_'.$rid}})) &&
(defined($hash{'map_finish_'.$hash{'src_'.$rid}}))) {
my $frid=$hash{'map_finish_'.$hash{'src_'.$rid}};
$sofar=
&tracetable($sofar,$hash{'map_start_'.$hash{'src_'.$rid}},
'&'.$frid.'&');
$sofar++;
if ($hash{'src_'.$frid}) {
my $brepriv=&Apache::lonnet::allowed('bre',$hash{'src_'.$frid});
if (($brepriv eq '2') || ($brepriv eq 'F')) {
if (defined($rows[$sofar])) {
$rows[$sofar].='&'.$frid;
} else {
$rows[$sofar]=$frid;
}
}
}
}
} else {
$sofar++;
if ($hash{'src_'.$rid}) {
my $brepriv=&Apache::lonnet::allowed('bre',$hash{'src_'.$rid});
if (($brepriv eq '2') || ($brepriv eq 'F')) {
if (defined($rows[$sofar])) {
$rows[$sofar].='&'.$rid;
} else {
$rows[$sofar]=$rid;
}
}
}
}
if (defined($hash{'to_'.$rid})) {
my $mincond=1;
my $next='';
foreach (split(/\,/,$hash{'to_'.$rid})) {
my $thiscond=
&Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$_}});
if ($thiscond>=$mincond) {
if ($next) {
$next.=','.$_.':'.$thiscond;
} else {
$next=$_.':'.$thiscond;
}
if ($thiscond>$mincond) { $mincond=$thiscond; }
}
}
foreach (split(/\,/,$next)) {
my ($linkid,$condval)=split(/\:/,$_);
if ($condval>=$mincond) {
my $now=&tracetable($sofar,$hash{'goesto_'.$linkid},$beenhere);
if ($now>$further) { $further=$now; }
}
}
}
}
return $further;
}
# ================================================================ Main Handler
sub handler {
my $r=shift;
# ------------------------------------------- Set document type for header only
if ($r->header_only) {
if ($ENV{'browser.mathml'}) {
$r->content_type('text/xml');
} else {
$r->content_type('text/html');
}
$r->send_http_header;
return OK;
}
&Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
['forceselect','launch']);
my $requrl=$r->uri;
my $target = $ENV{'form.grade_target'};
# ----------------------------------------------------------------- Tie db file
if (($ENV{'request.course.fn'}) && (!$ENV{'form.forceselect'})) {
my $fn=$ENV{'request.course.fn'};
if (-e "$fn.db") {
if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER,0640)) {
# ------------------------------------------------------------------- Hash tied
my $firstres=$hash{'map_start_'.$requrl};
my $lastres=$hash{'map_finish_'.$requrl};
if (($firstres) && ($lastres)) {
# ----------------------------------------------------------------- Render page
@rows=();
&tracetable(0,$firstres,'&'.$lastres.'&');
if ($hash{'src_'.$lastres}) {
my $brepriv=
&Apache::lonnet::allowed('bre',$hash{'src_'.$lastres});
if (($brepriv eq '2') || ($brepriv eq 'F')) {
$rows[$#rows+1]=''.$lastres;
}
}
# ------------------------------------------------------------ Add to symb list
my $i;
my %symbhash=();
for ($i=0;$i<=$#rows;$i++) {
if ($rows[$i]) {
my @colcont=split(/\&/,$rows[$i]);
foreach (@colcont) {
$symbhash{$hash{'src_'.$_}}='';
}
}
}
&Apache::lonnet::symblist($requrl,%symbhash);
# ------------------------------------------------------------------ Page parms
my $number_of_columns = 1;
my $j;
my $lcm=1;
my $contents=0;
my $nforms=0;
my %ssibody=();
my %ssibgcolor=();
my %ssitext=();
my %ssilink=();
my %ssivlink=();
my %ssialink=();
my %metalink=();
my %cellemb=();
my $allscript='';
my $allmeta='';
my $isxml=0;
my $xmlheader='';
my $xmlbody='';
# --------------------------------------------- Get SSI output, post parameters
for ($i=0;$i<=$#rows;$i++) {
if ($rows[$i]) {
$contents++;
my @colcont=split(/\&/,$rows[$i]);
$lcm*=($#colcont+1)/euclid($lcm,($#colcont+1));
foreach (@colcont) {
my $src=$hash{'src_'.$_};
$src=~/\.(\w+)$/;
$metalink{$_}=$src.'.meta';
$cellemb{$_}=Apache::loncommon::fileembstyle($1);
if ($cellemb{$_} eq 'ssi') {
# --------------------------------------------------------- This is an SSI cell
my $prefix=$_.'_';
my %posthash=('request.prefix' => $prefix);
if (($ENV{'form.'.$prefix.'submit'})
|| ($ENV{'form.all_submit'})) {
foreach (keys %ENV) {
if ($_=~/^form.$prefix/) {
my $name=$_;
$name=~s/^form.$prefix//;
$posthash{$name}=$ENV{$_};
}
}
}
my $output=Apache::lonnet::ssi($src,%posthash);
my $parser=HTML::TokeParser->new(\$output);
my $token;
my $thisdir=$src;
my $bodydef=0;
my $thisxml=0;
my @rlinks=();
if ($output=~/\?xml/) {
$isxml=1;
$thisxml=1;
$output=~
/((?:\<(?:\?xml|\!DOC|html)[^\>]*(?:\>|\>\]\>)\s*)+)\<body[^\>]*\>/si;
$xmlheader=$1;
}
while ($token=$parser->get_token) {
if ($token->[0] eq 'S') {
if ($token->[1] eq 'a') {
if ($token->[2]->{'href'}) {
$rlinks[$#rlinks+1]=
$token->[2]->{'href'};
}
} elsif ($token->[1] eq 'img') {
$rlinks[$#rlinks+1]=
$token->[2]->{'src'};
} elsif ($token->[1] eq 'embed') {
$rlinks[$#rlinks+1]=
$token->[2]->{'src'};
} elsif ($token->[1] eq 'base') {
$thisdir=$token->[2]->{'href'};
} elsif ($token->[1] eq 'body') {
$bodydef=1;
$ssibgcolor{$_}=$token->[2]->{'bgcolor'};
$ssitext{$_}=$token->[2]->{'text'};
$ssilink{$_}=$token->[2]->{'link'};
$ssivlink{$_}=$token->[2]->{'vlink'};
$ssialink{$_}=$token->[2]->{'alink'};
if ($thisxml) {
$xmlbody=$token->[4];
}
} elsif ($token->[1] eq 'meta') {
if ($token->[4] !~ m:/>$:) {
$allmeta.="\n".$token->[4].'</meta>';
} else {
$allmeta.="\n".$token->[4];
}
} elsif (($token->[1] eq 'script') &&
($bodydef==0)) {
$allscript.="\n\n"
.$parser->get_text('/script');
}
}
}
if ($output=~/\<body[^\>]*\>(.*)/si) {
$output=$1;
}
$output=~s/\<\/body\>.*//si;
if ($output=~/\<form/si) {
$nforms++;
$output=~s/\<form[^\>]*\>//gsi;
$output=~s/\<\/form[^\>]*\>//gsi;
$output=~
s/\<((?:input|select|button|textarea)[^\>]+)name\s*\=\s*[\'\"]*([\w\.\:]+)[\'\"]*([^\>]*)\>/\<$1 name="$prefix$2" $3\>/gsi;
}
$thisdir=~s/\/[^\/]*$//;
foreach (@rlinks) {
unless (($_=~/^http:\/\//i) ||
($_=~/^\//) ||
($_=~/^javascript:/i) ||
($_=~/^mailto:/i) ||
($_=~/^\#/)) {
my $newlocation=
&Apache::lonnet::hreflocation($thisdir,$_);
$output=~s/(\"|\'|\=\s*)$_(\"|\'|\s|\>)/$1$newlocation$2/;
}
}
# -------------------------------------------------- Deal with Applet codebases
$output=~s/(\<applet[^\>]+)(codebase\=[^\S\>]+)*([^\>]*)\>/$1.($2?$2:' codebase="'.$thisdir.'"').$3.'>'/gei;
$ssibody{$_}=$output;
# ---------------------------------------------------------------- End SSI cell
}
}
}
}
unless ($contents) {
$r->content_type('text/html');
$r->send_http_header;
$r->print('<html><body>Empty page.</body></html>');
} else {
# ------------------------------------------------------------------ Build page
# ---------------------------------------------------------------- Send headers
unless ($target eq 'tex') {
if ($isxml) {
$r->content_type('text/xml');
$r->send_http_header;
$r->print($xmlheader);
} else {
$r->content_type('text/html');
$r->send_http_header;
$r->print('<html>');
}
# ------------------------------------------------------------------------ Head
$r->print("\n<head>\n".$allmeta);
$allscript=~
s/\/\/ BEGIN LON\-CAPA Internal.+\/\/ END LON\-CAPA Internal\s//gs;
if ($allscript) {
$r->print("\n<script language='JavaScript'>\n".
$allscript."\n</script>\n");
}
$r->print(&Apache::lonxml::registerurl(1,undef));
$r->print("\n</head>\n");
# ------------------------------------------------------------------ Start body
if ($isxml) {
$r->print($xmlbody);
} else {
$r->print('<body bgcolor="#FFFFFF" onLoad="'.&Apache::lonxml::loadevents.'" onUnload="'.&Apache::lonxml::unloadevents.'">');
}
# ------------------------------------------------------------------ Start form
if ($nforms) {
$r->print('<form method="post" action="'.
$requrl.'">');
}
} else {
$r->print('\documentclass[letterpaper]{article}
\newcommand{\keephidden}[1]{}
\usepackage[dvips]{graphicx}
\usepackage{epsfig}
\usepackage{calc}
\usepackage{longtable}
\begin{document}');
}
# ----------------------------------------------------------------- Start table
if ($target eq 'tex') {
$r->print('\begin{longtable}INSERTTHEHEADOFLONGTABLE\endfirsthead\endhead ');
} else {
$r->print('<table cols="'.$lcm.'" border="0">');
}
for ($i=0;$i<=$#rows;$i++) {
if ($rows[$i]) {
unless ($target eq 'tex') {
$r->print("\n<tr>");
}
my @colcont=split(/\&/,$rows[$i]);
my $avespan=$lcm/($#colcont+1);
for ($j=0;$j<=$#colcont;$j++) {
my $rid=$colcont[$j];
my $metainfo='<a href="'.
$metalink{$rid}.'" target="LONcatInfo">'.
'<img src="/adm/lonMisc/cat_button.gif" border=0>'.
'</img></a><a href="/adm/evaluate?postdata='.
&Apache::lonnet::escape(&Apache::lonnet::declutter($hash{'src_'.$rid}))
.'" target="LONcatInfo">'.
'<img src="/adm/lonMisc/eval_button.gif" border=0>'.
'</img></a>';
if (
($hash{'src_'.$rid}=~/\.(problem|exam|quiz|assess|survey|form)$/) &&
(&Apache::lonnet::allowed('mgr',$ENV{'request.course.id'}))) {
my ($mapid,$resid)=split(/\./,$rid);
my $symb=
&Apache::lonnet::declutter($hash{'map_id_'.$mapid}).
'___'.$resid.'___'.
&Apache::lonnet::declutter($hash{'src_'.$rid});
$metainfo.=
'<a href="/adm/grades?symb='.&Apache::lonnet::escape($symb).
'&command=submission" target="LONcatInfo">'.
'<img src="/adm/lonMisc/subm_button.gif" border=0>'.
'</img></a>'.
'<a href="/adm/grades?symb='.&Apache::lonnet::escape($symb).
'&command=gradingmenu" target="LONcatInfo">'.
'<img src="/adm/lonMisc/pgrd_button.gif" border=0>'.
'</img></a>'.
'<a href="/adm/parmset?symb='.&Apache::lonnet::escape($symb).
'" target="LONcatInfo">'.
'<img src="/adm/lonMisc/pprm_button.gif" border=0>'.
'</img></a>';
}
$metainfo.='<br></br>';
unless ($target eq 'tex') {
$r->print('<td colspan="'.$avespan.'"');
}
if ($cellemb{$rid} eq 'ssi') {
unless ($target eq 'tex') {
if ($ssibgcolor{$rid}) {
$r->print(' bgcolor="'.
$ssibgcolor{$rid}.'"');
}
$r->print('>'.$metainfo.'<font');
if ($ssitext{$rid}) {
$r->print(' text="'.$ssitext{$rid}.'"');
}
if ($ssilink{$rid}) {
$r->print(' link="'.$ssilink{$rid}.'"');
}
if ($ssitext{$rid}) {
$r->print(' vlink="'.$ssivlink{$rid}.'"');
}
if ($ssialink{$rid}) {
$r->print(' alink="'.$ssialink{$rid}.'"');
}
$r->print('>');
}
$r->print($ssibody{$rid});
unless ($target eq 'tex') {
$r->print('</font>');
}
if ($ENV{'course.'.
$ENV{'request.course.id'}.
'.pageseparators'} eq 'yes') {
unless($target eq 'tex') {
$r->print('<hr />');
} else {
$r->print('\hline');
}
}
} elsif ($cellemb{$rid} eq 'img') {
$r->print('>'.$metainfo.'<img src="'.
$hash{'src_'.$rid}.'"></img>');
} elsif ($cellemb{$rid} eq 'emb') {
$r->print('>'.$metainfo.'<embed src="'.
$hash{'src_'.$rid}.'"></embed>');
}
unless ($target eq 'tex') {
$r->print('</td>');
} else {
$number_of_columns++;
$r->print(' & ');
}
}
unless ($target eq 'tex') {
$r->print('</tr>');
} else {
$number_of_columns = 1;
$r->print('REMOVETHEHEADOFLONGTABLE\\\\');
}
}
}
unless ($target eq 'tex') {
$r->print("\n</table>");
} else {
$r->print('\end{longtable}');
}
# ---------------------------------------------------------------- Submit, etc.
if ($nforms) {
$r->print(
'<input name="all_submit" value="Submit All" type="'.
(($nforms>1)?'submit':'hidden').'"></input></form>');
}
unless ($target eq 'tex') {
$r->print('</body>'.&Apache::lonxml::xmlend());
} else {
$r->print('\end{document}'.$number_of_columns);
}
# -------------------------------------------------------------------- End page
}
# ------------------------------------------------------------- End render page
} else {
$r->content_type('text/html');
$r->send_http_header;
&Apache::lonsequence::viewmap($r,$requrl);
}
# ------------------------------------------------------------------ Untie hash
unless (untie(%hash)) {
&Apache::lonnet::logthis("<font color=blue>WARNING: ".
"Could not untie coursemap $fn (browse).</font>");
}
# -------------------------------------------------------------------- All done
return OK;
# ----------------------------------------------- Errors, hash could no be tied
}
}
}
$r->content_type('text/html');
$r->send_http_header;
&Apache::lonsequence::viewmap($r,$requrl);
return OK;
}
1;
__END__
=head1 NAME
Apache::lonpage - Page Handler
=head1 SYNOPSIS
Invoked by /etc/httpd/conf/srm.conf:
<LocationMatch "^/res/.*\.page$>
SetHandler perl-script
PerlHandler Apache::lonpage
</LocationMatch>
=head1 INTRODUCTION
This module renders a .page resource.
This is part of the LearningOnline Network with CAPA project
described at http://www.lon-capa.org.
=head1 HANDLER SUBROUTINE
This routine is called by Apache and mod_perl.
=over 4
=item *
set document type for header only
=item *
tie db file
=item *
render page
=item *
add to symb list
=item *
page parms
=item *
Get SSI output, post parameters
=item *
SSI cell rendering
=item *
Deal with Applet codebases
=item *
Build page
=item *
send headers
=item *
start body
=item *
start form
=item *
start table
=item *
submit element, etc, render page, untie hash
=back
=head1 OTHER SUBROUTINES
=over 4
=item *
euclid() : Euclid's method for determining the greatest common denominator.
=item *
tracetable() : Build page table.
=back
=cut
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