File:
[LON-CAPA] /
rat /
lonpage.pm
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1.57:
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Sun Aug 29 18:34:36 2004 UTC (20 years, 8 months ago) by
raeburn
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MAIN
CVS tags:
version_1_2_X,
HEAD
1. Add lonlocal (line 48) so &mt() call at line 354 is error-free.
2. Changes to sub tracetable().
Most changes are indentation changes to conform to LON-CAPA style.
Functionality changes are: lines 76-79 - detect if resource is hidden, and user has student role. If so lines 82-115 are not executed. Purpose is to display hidden resources in a page to non-students, but to hide them from students. Might cause confusion in the attached discussions, as different students may be commenting on different resources in the page. Recommendation for future is to add an apprpriate note to any feedback window, where feedback is being given on a page with hidden resources.
# The LearningOnline Network with CAPA
# Page Handler
#
# $Id: lonpage.pm,v 1.57 2004/08/29 18:34:36 raeburn 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
# 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 Apache::lonlocal;
use Apache::lonmenu;
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;
my $randomout=0;
if ($ENV{'request.role'} =~ /^st/) {
$randomout = $hash{'randomout_'.$rid};
}
unless ($beenhere=~/\&$rid\&/) {
$beenhere.=$rid.'&';
unless ($randomout) {
if (defined($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 ($ENV{'browser.mathml'}) {
&Apache::loncommon::content_type($r,'text/xml');
} else {
&Apache::loncommon::content_type($r,'text/html');
}
$r->send_http_header;
return OK;
}
&Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
['forceselect','launch']);
my $number_of_columns = 1;
my $requrl=$r->uri;
my $target = $ENV{'form.grade_target'};
# &Apache::lonnet::logthis("Got a target of $target");
if ($target eq 'meta') {
&Apache::loncommon::content_type($r,'text/html');
$r->send_http_header;
return OK;
}
# ----------------------------------------------------------------- Tie db file
if (($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,'&');
# ------------------------------------------------------------ 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 $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.grade_target'} eq 'tex') {
$posthash{'grade_target'}=$ENV{'form.grade_target'};
$posthash{'textwidth'}=$ENV{'form.textwidth'};
$posthash{'problem_split'}=$ENV{'form.problem_split'};
$posthash{'latex_type'}=$ENV{'form.latex_type'};
$posthash{'rndseed'}=$ENV{'form.rndseed'};
}
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);
$output=~
s/\/\/ BEGIN LON\-CAPA Internal.+\/\/ END LON\-CAPA Internal\s//gs;
if ($target eq 'tex') {
$output =~ s/^([^&]+)\\begin{document}//;
$output =~ s/\\end{document}//;
$output = '\parbox{\minipagewidth}{ '.$output.' }';
#some additional cleanup necessary for LateX (due to limitations of table environment
$output =~ s/(\\vskip\s*\d+mm)\s*(\\\\)+/$1/g;
}
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) {
&Apache::loncommon::content_type($r,'text/html');
$r->send_http_header;
$r->print('<html><body>'.&mt('Empty page').'.</body></html>');
} else {
# ------------------------------------------------------------------ Build page
# ---------------------------------------------------------------- Send headers
unless ($target eq 'tex') {
if ($isxml) {
&Apache::loncommon::content_type($r,'text/xml');
$r->send_http_header;
$r->print($xmlheader);
} else {
&Apache::loncommon::content_type($r,'text/html');
$r->send_http_header;
$r->print('<html>');
}
# ------------------------------------------------------------------------ Head
$r->print("\n<head>\n".$allmeta);
if ($allscript) {
$r->print("\n<script language='JavaScript'>\n".
$allscript."\n</script>\n");
}
$r->print(&Apache::lonmenu::registerurl(1,undef));
$r->print("\n</head>\n");
# ------------------------------------------------------------------ Start body
if ($isxml) {
$r->print($xmlbody);
} else {
$r->print(
'<body bgcolor="#FFFFFF" onLoad="'.&Apache::lonmenu::loadevents.
'" onUnload="'.&Apache::lonmenu::unloadevents.'">'.
&Apache::lonmenu::menubuttons(undef,$target,1)
);
}
# ------------------------------------------------------------------ Start form
if ($nforms) {
$r->print('<form method="post" action="'.
$requrl.'">');
}
} elsif ($target eq 'tex') {
$r->print('\documentclass{article}
\newcommand{\keephidden}[1]{}
\usepackage[dvips]{graphicx}
\usepackage{epsfig}
\usepackage{calc}
\usepackage{longtable}
\begin{document}');
}
# ----------------------------------------------------------------- Start table
if ($target eq 'tex') {
$r->print('\begin{longtable}INSERTTHEHEADOFLONGTABLE\endfirsthead\endhead ');
if ($number_of_columns le $lcm) {$number_of_columns=$lcm;};
} 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 $metainfo='<a name="'.
&Apache::lonnet::escape(&Apache::lonnet::declutter($hash{'src_'.$rid})).'" />'.
'<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">'.
'&command=submission">'.
'<img src="/adm/lonMisc/subm_button.gif" border=0>'.
'</img></a>'.
'<a href="/adm/grades?symb='.&Apache::lonnet::escape($symb).
# '&command=gradingmenu" target="LONcatInfo">'.
'&command=gradingmenu">'.
'<img src="/adm/lonMisc/pgrd_button.gif" border=0>'.
'</img></a>'.
'<a href="/adm/parmset?symb='.&Apache::lonnet::escape($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 {
for (my $incol=1;$incol<=$avespan;$incol++) {
$r->print(' & ');
}
}
}
unless ($target eq 'tex') {
$r->print('</tr>');
} else {
$r->print('REMOVETHEHEADOFLONGTABLE\\\\');
}
}
}
unless ($target eq 'tex') {
$r->print("\n</table>");
} else {
$r->print('\end{longtable}\strut');
}
# ---------------------------------------------------------------- Submit, etc.
if ($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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