# The LearningOnline Network with CAPA
# Page Handler
#
# (TeX Content Handler
#
# 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 Gerd Kortemeyer
package Apache::lonpage;
use strict;
use Apache::Constants qw(:common :http);
use Apache::lonnet();
use Apache::lonxml();
use HTML::TokeParser;
use GDBM_File;
# -------------------------------------------------------------- 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='';
map {
my $thiscond=
&Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$_}});
if ($thiscond>=$mincond) {
if ($next) {
$next.=','.$_.':'.$thiscond;
} else {
$next=$_.':'.$thiscond;
}
if ($thiscond>$mincond) { $mincond=$thiscond; }
}
} split(/\,/,$hash{'to_'.$rid});
map {
my ($linkid,$condval)=split(/\:/,$_);
if ($condval>=$mincond) {
my $now=&tracetable($sofar,$hash{'goesto_'.$linkid},$beenhere);
if ($now>$further) { $further=$now; }
}
} split(/\,/,$next);
}
}
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;
}
my $requrl=$r->uri;
# ----------------------------------------------------------------- Tie db file
if ($ENV{'request.course.fn'}) {
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]);
map {
$symbhash{$hash{'src_'.$_}}='';
} @colcont;
}
}
&Apache::lonnet::symblist($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));
map {
my $src=$hash{'src_'.$_};
$src=~/\.(\w+)$/;
$metalink{$_}=$src.'.meta';
$cellemb{$_}=Apache::lonnet::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'})) {
map {
if ($_=~/^form.$prefix/) {
my $name=$_;
$name=~s/^form.$prefix//;
$posthash{$name}=$ENV{$_};
}
} keys %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') {
$allmeta.="\n".$token->[4].'</meta>';
} 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;
}
$thisdir=~s/\/[^\/]*$//;
map {
unless (($_=~/^http:\/\//i) ||
($_=~/^\//)) {
my $newlocation=
&Apache::lonnet::hreflocation($thisdir,$_);
$output=~s/(\"|\'|\=\s*)$_(\"|\'|\s|\>)/$1$newlocation$2/;
}
} @rlinks;
$output=~s/\<\s*applet/\<applet codebase=\"$thisdir\" /gi;
$ssibody{$_}=$output;
# ---------------------------------------------------------------- End SSI cell
}
} @colcont;
}
}
unless ($contents) {
$r->content_type('text/html');
$r->send_http_header;
$r->print('<html><body>Empty page.</body></html>');
} else {
# ------------------------------------------------------------------ Build page
# ---------------------------------------------------------------- Send headers
if ($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);
$r->print("\n</head>\n");
# ------------------------------------------------------------------ Start body
if ($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.'">');
}
# ----------------------------------------------------------------- Start table
$r->print('<table cols="'.$lcm.'" border="0">');
for ($i=0;$i<=$#rows;$i++) {
if ($rows[$i]) {
$r->print("\n<tr>");
my @colcont=split(/\&/,$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><br></br>';
$r->print('<td colspan="'.$avespan.'"');
if ($cellemb{$rid} eq 'ssi') {
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}.'"');
}
$r->print('>'.$ssibody{$rid}.'</font>');
} elsif ($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>');
}
$r->print('</td>');
}
$r->print('</tr>');
}
}
$r->print("\n</table>");
# ---------------------------------------------------------------- Submit, etc.
if ($nforms) {
$r->print(
'<input name="all_submit" value="Submit All" type="'.
(($nforms>1)?'submit':'hidden').'"></input></form>');
}
$r->print('</body></html>');
# -------------------------------------------------------------------- End page
}
# ------------------------------------------------------------- End render page
} else {
$r->content_type('text/html');
$r->send_http_header;
$r->print('<html><body>Page undefined.</body></html>');
}
# ------------------------------------------------------------------ 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
}
}
}
$ENV{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
return HTTP_NOT_ACCEPTABLE;
}
1;
__END__
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