# The LearningOnline Network with CAPA
#
# Directory Indexer
# (Login Screen
#
# 5/21/99,5/22,5/25,5/26,5/31,6/2,6/10,7/12,7/14 Gerd Kortemeyer)
# 11/23 Gerd Kortemeyer
# 07/20-08/04 H.K. Ng
#
# 05/9-05/19/2001 H. K. Ng
# 05/21/2001 H. K. Ng
# 05/23/2001 H. K. Ng
# 05/31/2001 Scott Harrison
# 06/01/2001 Scott Harrison
# 06/02/2001 Scott Harrison
# 06/15/2001 Scott Harrison
# 06/26/2001 H. K. Ng
# 07/08/2001 H. K. Ng

package Apache::lonindexer;

use strict;
use Apache::lonnet();
use Apache::Constants qw(:common);
use Apache::File;
use GDBM_File;

my %hash;
my %dirs;
my %language;
my $hidden;
my $extrafield;
my $fnum;
sub BEGIN {
    my $fh=Apache::File->new($Apache::lonnet::perlvar{'lonTabDir'}.
			     '/language.tab');
    map {
	$_=~/(\w+)\s+([\w\s\-]+)/;
	$language{$1}=$2;
    } <$fh>;
}

sub handler {
    my $r = shift;
    $r->content_type('text/html');
    $r->send_http_header;
    return OK if $r->header_only;
    $fnum=0;
    my $iconpath= $r->dir_config('lonIconsURL') . "/";
    my $domain  = $r->dir_config('lonDefDomain');
    my $role    = $r->dir_config('lonRole');
    my $loadlim = $r->dir_config('lonLoadLim');
    my $servadm = $r->dir_config('lonAdmEMail');
    my $sysadm  = $r->dir_config('lonSysEMail');
    my $lonhost = $r->dir_config('lonHostID');
    my $tabdir  = $r->dir_config('lonTabDir');

    my $fileclr='#ffffe6';
# -------------------------------------- see if called from an interactive mode
    map {
       my ($name, $value) = split(/=/,$_);
       $value =~ tr/+/ /;
       $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
       if ($name eq 'catalogmode') {
           $ENV{'form.'.$name}=$value;
	   }
    } (split(/&/,$ENV{'QUERY_STRING'}));

    $hidden=''; my $closebutton='';
    my $groupimportbutton='';
    my $colspan=''; 

    $extrafield='';
    if ($ENV{'form.catalogmode'} eq 'interactive') {
	$extrafield='<td bgcolor="'.$fileclr.'" valign="bottom">'.
	    '<a name="$anchor"><img src="'.$iconpath.'whitespace1.gif"'.
	    ' border="0"></td>';
	$colspan=" colspan='2' ";
	$hidden=<<END;
<input type='hidden' name='catalogmode' value='interactive'>
END
        $closebutton=<<END;
<input type="button" name="close" value='CLOSE' onClick="self.close()">
END
    }
    elsif ($ENV{'form.catalogmode'} eq 'groupimport') {
	$extrafield='<td bgcolor="'.$fileclr.'" valign="bottom">'.
	    '<a name="$anchor"><img src="'.$iconpath.'whitespace1.gif"'.
	    ' border="0"></td>';
	$colspan=" colspan='2' ";
	$hidden=<<END;
<input type='hidden' name='catalogmode' value='groupimport'>
END
        $closebutton=<<END;
<input type="button" name="close" value='CLOSE' onClick="self.close()">
END
        $groupimportbutton=<<END;
<input type="button" name="groupimport" value='GROUP IMPORT' onClick="javascript:select_group()">
END
    }

    my $catalogmodefunctions='';
    if ($ENV{'form.catalogmode'} eq 'interactive' or
	$ENV{'form.catalogmode'} eq 'groupimport') {
	$catalogmodefunctions=<<END;
function select_data(title,url) {
    changeTitle(title);
    changeURL(url);
    self.close();
}
function save_group() {
    for (var num=0; num<document.forms.fnum.fnum.value; num++) {
	if (eval("document.forms.form"+num+".filelink.checked")) {
	    alert(eval("document.forms.form"+num+".title.value")+
		       eval("document.forms.form"+num+".filelink.value"));
	}
    }
}
function select_group() {
    var linkflag=false;
    for (var num=0; num<document.forms.fnum.fnum.value; num++) {
	if (eval("document.forms.form"+num+".filelink.checked")) {
//	    alert(eval("document.forms.form"+num+".title.value")+
//		       eval("document.forms.form"+num+".filelink.value"));
	    insertRowInLastRow();
	    placeResourceInLastRow(
		   eval("document.forms.form"+num+".title.value"),
		   eval("document.forms.form"+num+".filelink.value"),
		   linkflag
				   );
	    linkflag=true;
	}
    }
    opener.editmode=0;
    opener.notclear=0;
    opener.linkmode=0;
    opener.infoclear();
    opener.draw();
}
function insertRowInLastRow() {
    opener.insertrow(opener.maxrow);
    opener.addobj(opener.maxrow,'e&2');
}
function placeResourceInLastRow (title,url,linkflag) {
    opener.newresource(opener.maxrow,2,opener.escape(title),opener.escape(url),'false','normal');
    opener.save();
    opener.mostrecent=opener.obj.length-1;
    if (linkflag) {
	opener.joinres(opener.linkmode,opener.mostrecent,0);
    }
    opener.linkmode=opener.mostrecent;
}
function changeTitle(val) {
    if (opener.inf.document.forms.resinfo.elements.t) {
        opener.inf.document.forms.resinfo.elements.t.value=val;
    }
}
function changeURL(val) {
    if (opener.inf.document.forms.resinfo.elements.u) {
	opener.inf.document.forms.resinfo.elements.u.value=val;
    }
}
END
    }

# ---------------------------------------------------------------- Print Header
    $r->print(<<ENDHEADER);
<html>
<head>
<title>The LearningOnline Network With CAPA Directory Browser</title>

<script language="javascript">
$catalogmodefunctions
function openWindow(url, wdwName, w, h, toolbar,scrollbar) {
    var options = "width=" + w + ",height=" + h + ",";
    options += "resizable=yes,scrollbars="+scrollbar+",status=no,";
    options += "menubar=no,toolbar="+toolbar+",location=no,directories=no";
    var newWin = window.open(url, wdwName, options);
    newWin.focus();
}
</script>

</head>
<body bgcolor="#FFFFFF">
ENDHEADER

    my $line;
    my (@attrchk,@openpath);
    my $uri=$r->uri;

    $r->print('<h2><font color="#888888">The LearningOnline With CAPA Network Directory Browser</font></h2>'."\n");

    my $diropendb = "/home/httpd/perl/tmp/$domain\_$ENV{'user.name'}_indexer.db";

    if (tie(%hash,'GDBM_File',$diropendb,&GDBM_WRCREAT,0640)) {

	if ($ENV{'form.attrs'} ne "") {
	    for (my $i=0; $i<=5; $i++) {
		delete $hash{'display_attrs_'.$i};
		if ($ENV{'form.attr'.$i} == 1) {
		    $attrchk[$i] = "checked";
		    $hash{'display_attrs_'.$i} = 1;
		}
	    }
	} else {
	    for (my $i=0; $i<=5; $i++) {
		$attrchk[$i] = "checked" if $hash{'display_attrs_'.$i} == 1;
	    }
	}
    $r->print(<<END);
<b><font color="#666666">Display file attributes</font></b><br>
<form method="post" name="fileattr" action="$uri" enctype="application/x-www-form-urlencoded">
<table border=0><tr>
<td><input type=checkbox name=attr0 value="1" $attrchk[0]> Size</td>
<td><input type=checkbox name=attr1 value="1" $attrchk[1]> Last access</td>
<td><input type=checkbox name=attr2 value="1" $attrchk[2]> Last modified</td>
</tr><tr>
<td><input type=checkbox name=attr3 value="1" $attrchk[3]> Author</td>
<td><input type=checkbox name=attr4 value="1" $attrchk[4]> Keywords</td>
<td><input type=checkbox name=attr5 value="1" $attrchk[5]> Language</td>
</tr></table>
<input type=hidden name=dirPointer value="on">
<input type="submit" name="attrs" value="Review">&nbsp;
<input type="submit" name="attrs" value="Refresh">
$hidden
$closebutton
$groupimportbutton
</form>
END

    my $titleclr="#ddffff";
    $r->print("<table border=0><tr><td bgcolor=#eeeeee>\n");
    $r->print("<table border=0><tr>\n");
    $r->print("<td $colspan bgcolor=$titleclr><b>Name</b></td>\n");
    $r->print("<td bgcolor=$titleclr align=right><b>Size (bytes) </b></td>\n") if ($hash{'display_attrs_0'} == 1);
    $r->print("<td bgcolor=$titleclr><b>Last accessed</b></td>\n") if ($hash{'display_attrs_1'} == 1);
    $r->print("<td bgcolor=$titleclr><b>Last modified</b></td>\n") if ($hash{'display_attrs_2'} == 1);
    $r->print("<td bgcolor=$titleclr><b>Author(s)</b></td>\n") if ($hash{'display_attrs_3'} == 1);
    $r->print("<td bgcolor=$titleclr><b>Keywords</b></td>\n") if ($hash{'display_attrs_4'} == 1);
    $r->print("<td bgcolor=$titleclr><b>Language</b></td>\n") if ($hash{'display_attrs_5'} == 1);
    $r->print("</tr>");

	map {
	    if ($_ =~ /^diropen_status_/) {
		my $key = $_;
		$key =~ s/^diropen_status_//;
		$dirs{$key} = $hash{$_};
	    }
	} keys %hash;

	if ($ENV{'form.openuri'}) {  # take care of review and refresh options
	    my $uri=$ENV{'form.openuri'};
	    if (exists($hash{'diropen_status_'.$uri})) {
		my $cursta = $hash{'diropen_status_'.$uri};
		$dirs{$uri} = 'open';
		$hash{'diropen_status_'.$uri} = 'open';
		if ($cursta eq 'open') {
		    $dirs{$uri} = 'closed';
		    $hash{'diropen_status_'.$uri} = 'closed';
		}
	    } else {
		$hash{'diropen_status_'.$uri} = 'open';
		$dirs{$uri} = 'open';
	    }
	}
	
	my $bredir = $ENV{'form.dirPointer'};
	my $toplevel;
	my $indent = 0;
	$uri = $uri.'/' if $uri !~ /.*\/$/;
	if ($bredir ne "on") {
	    $hash{'top.level'} = $uri;
	    $toplevel = $uri;

	} else {
	    $toplevel = $hash{'top.level'};
	}
	if ($toplevel ne "/res/"){
	    my (@uri_com) = split(/\//,$uri);
	    pop @uri_com;
	    my $upone = join('/',@uri_com);
	    my @list = qw (0);
	    &display_line ($r,'opened',$upone.'&viewOneUp',0,$upone,@list);
	    $indent = 1;
	}
	&scanDir ($r,$toplevel,$indent);
	
	$r->print("<form name='fnum'>");
	$r->print("<input type='hidden' name='fnum' value='$fnum'></form>");
	$r->print("</table>");
	$r->print("</td></tr></table>");
	$r->print("</body></html>\n");
	untie(%hash);
    } else {
	$r->print("Unable to tie hash to db file");
    }
    return OK;
}


# --------------------recursive scan of a directory
sub scanDir {
    my ($r,$startdir,$indent)=@_;
    my ($compuri,$curdir);
    my $dirptr=16384;
    $indent++;

    my %dupdirs = %dirs;
    my @list=&get_list($r,$startdir);
    foreach my $line (@list) {
	my ($strip,$dom,$foo,$testdir,$foo)=split(/\&/,$line,5); 
	next if $strip =~ /.*\.meta$/;
	if ($dom eq "domain") {
	    $compuri = join('',$strip,"/");  # domain list has /res/<domain name>
	    $curdir = $compuri;
	} else {
	    $compuri = join('',$startdir,$strip,"/"); # user, dir & file have name only, i.e., w/o path
	    $curdir = $startdir;
	}
	my $diropen = "closed";
	if (($dirptr&$testdir) or ($dom =~ /^(domain|user)$/)) {
	    while (my ($key,$val)= each %dupdirs) {
		if ($key eq $compuri and $val eq "open") {
		    $diropen = "opened";
		    delete $dupdirs{key},$dirs{$key};
		}
	    }
	}
	&display_line($r,$diropen,$line,$indent,$curdir,@list);
	&scanDir ($r,$compuri,$indent) if $diropen eq "opened";
    }
    $indent--;
}

# ----------------- get complete matched list based on the uri ------
sub get_list {
    my ($r,$uri)=@_;
    my @list;
    my $luri = $uri;
    $luri =~ s/\//_/g;

    if ($ENV{'form.attrs'} eq "Refresh") {
	map {
	    delete $hash{$_} if ($_ =~ /^dirlist_files_/);
	    } keys %hash;
    }

    if ($hash{'dirlist_files'.$luri}) {
	@list = split(/\n/,$hash{'dirlist_files_'.$luri});
    } else {
	@list = &Apache::lonnet::dirlist($uri);
	$hash{'dirlist_files_'.$luri} = join('\n',@list);
    }
    return @list=&match_ext($r,@list);
}

#-------------------------- filters out files based on extensions
sub match_ext {
    my ($r,@packlist)=@_;
    my @trimlist;
    my $nextline;
    my @fileext;
    my $dirptr=16384;

    my $tabdir  = $r->dir_config('lonTabDir');
    my $fn = $tabdir.'/filetypes.tab';
    if (-e $fn) {
	my $FH=Apache::File->new($fn);
	my @content=<$FH>;
	foreach my $line (@content) {
	    (my $ext,my $foo) = split /\s+/,$line;
	    push @fileext,$ext;
	}
    }
    foreach my $line (@packlist) {
	chomp $line;
	$line =~ s/^\/home\/httpd\/html//;
	my @unpackline = split (/\&/,$line);
	next if ($unpackline[0] eq ".");
	next if ($unpackline[0] eq "..");
	my @filecom = split (/\./,$unpackline[0]);
	my $fext = pop(@filecom);
	my $fnptr = $unpackline[3]&$dirptr;
 	if ($fnptr == 0 and $unpackline[3] ne "") {
	    foreach my $nextline (@fileext) {
		push @trimlist,$line if $nextline eq $fext;
	    }
	} else {
	    push @trimlist,$line;
	}
    }
    @trimlist = sort (@trimlist);
    return @trimlist;
}

#------------------- displays one line in appropriate table format
sub display_line{
    my ($r,$diropen,$line,$indent,$startdir,@list)=@_;
    my (@pathfn, $fndir, $fnptr);
    my $dirptr=16384;
    my $fileclr="#ffffe6";
    my $iconpath= $r->dir_config('lonIconsURL') . "/";

    my @filecom = split (/\&/,$line);
    my @pathcom = split (/\//,$filecom[0]);
    my $listname = $pathcom[scalar(@pathcom)-1];
    my $fnptr = $filecom[3]&$dirptr;
    my $msg = 'View '.$filecom[0].' resources';
    $msg = 'Close '.$filecom[0].' directory' if $diropen eq "opened";

    my $tabtag="</td>";
    my $i=0;

    while ($i<=5) {
	$tabtag=join('',$tabtag,"<td bgcolor=",$fileclr,">&nbsp;</td>") if $hash{'display_attrs_'.$i} == 1;
	$i++;
    }
    if ($filecom[1] eq "viewOneUp") {
	$r->print("<tr>$extrafield");
	$r->print("<td bgcolor=$fileclr valign=bottom>\n");
	$r->print ('<form method="post" name="dirpath" action="'.$startdir.
		   '" enctype="application/x-www-form-urlencoded">'."\n");
	$r->print ($hidden.'<input type=hidden name=openuri value="'.$startdir.'">'."\n");
	$r->print ('<input src="'.$iconpath.'arrow_up.gif"');
	$r->print (' name="'.$msg.'" height="22" type="image" border="0">'."\n");
	$r->print("Up $tabtag</tr></form>\n");
	return OK;
    }
    if ($filecom[1] eq "domain") {
	$r->print ('<input type=hidden name=dirPointer value="on">'."\n") if ($ENV{'form.dirPointer'} eq "on");
	$r->print("<tr>$extrafield");
	$r->print("<td bgcolor=$fileclr valign=bottom>");
	&begin_form ($r,$filecom[0].'/');
	my $anchor = $filecom[0].'/';
	$anchor =~ s/\///g;
	$r->print ('<a name="'.$anchor.'">');
	$r->print ('<input src="'.$iconpath.'folder_pointer_'.$diropen.'.gif"'); 
	$r->print (' name="'.$msg.'" height="22" type="image" border="0">'."\n");
	$r->print ('<a href="'.$filecom[0].'"><img src="'.$iconpath.'server.gif"');
	$r->print (' border="0"></a>'."\n");
	$r->print("Domain - $listname $tabtag</tr></form>\n");
	return OK;
    }
    if ($filecom[1] eq "user") {
	$r->print("<tr>$extrafield");
	$r->print("<td bgcolor=$fileclr valign=bottom nowrap>\n");
	my $curdir = $startdir.$filecom[0].'/';
	my $anchor = $curdir;
	$anchor =~ s/\///g;
	&begin_form ($r,$curdir);
	$r->print ('<a name="'.$anchor.'"><img src="'.$iconpath.'whitespace1.gif" border=0>'."\n");
	$r->print ('<input src="'.$iconpath.'folder_pointer_'.$diropen.'.gif"'); 
	$r->print (' name="'.$msg.'" height="22" type="image" border="0">'."\n");
	$r->print ('<a href="'.$curdir.'"><img src='.$iconpath.'quill.gif border=0 name="'.$msg.'" height="22"></a>');
	$r->print ($listname.$tabtag.'</tr></form>'."\n");
	return OK;
    }
# display file
    if ($fnptr == 0 and $filecom[3] ne "") {
	my @file_ext = split (/\./,$listname);
	my $curfext = $file_ext[scalar(@file_ext)-1];
	my $filelink = $startdir.$filecom[0];
	$r->print("<tr><td nowrap valign='bottom' bgcolor=$fileclr>");
	my $metafile = grep /^$filecom[0]\.meta\&/, @list;
	my $title;
        if ($ENV{'form.catalogmode'} eq 'interactive') {
	    $title=$listname;
	    $title = &Apache::lonnet::metadata($filelink,'title')
		if ($metafile == 1);
	    $title=$listname unless $title;
	    $r->print("<a href='javascript:select_data(\"",
	              $title,'","',$filelink,"\")'>");
	    $r->print("<img src='",$iconpath,"select.gif' border=0></a>\n");
	    $r->print("</td><td valign='bottom' nowrap bgcolor=$fileclr>");
	}
        elsif ($ENV{'form.catalogmode'} eq 'groupimport') {
	    $title=$listname;
	    $title = &Apache::lonnet::metadata($filelink,'title')
		if ($metafile == 1);
	    $title=$listname unless $title;
	    $r->print("<form name='form$fnum'>\n");
	    $r->print("<input type='checkbox' name='filelink"."' ".
		      "value='$filelink'>\n");
	    $r->print("<input type='hidden' name='title"."' ".
		      "value='$title'>\n");
	    $r->print("</form>\n");
	    $r->print("</td><td valign='bottom' nowrap bgcolor=$fileclr>");
  	    $fnum++;
	}

	if ($indent > 0 and $indent < 11) {
	    $r->print("<img src=",$iconpath,"whitespace",$indent,".gif border=0>\n");
	} elsif ($indent >0) {
	    my $ten = int($indent/10.);
	    my $rem = $indent%10.0;
	    my $count = 0;
	    while ($count < $ten) {
		$r->print("<img src=",$iconpath,"whitespace10.gif border=0>\n");
	    $count++;
	    }
	    $r->print("<img src=",$iconpath,"whitespace",$rem,".gif border=0>\n") if $rem > 0;
	}

	$r->print("<img src=$iconpath$curfext.gif border=0>\n");
	$r->print (" <a href=\"javascript:openWindow('".$filelink."', 'metadatafile', '450', '500', 'no', 'yes')\"; TARGET=_self>$listname</a> ");

	$r->print (" (<a href=\"javascript:openWindow('".$filelink.".meta', 'metadatafile', '400', '450', 'no', 'yes')\"; TARGET=_self>metadata</a>) ") if ($metafile == 1);

	$r->print("</td>\n");
	$r->print("<td bgcolor=$fileclr align=right valign=bottom> ",$filecom[8]," </td>\n") 
	    if $hash{'display_attrs_0'} == 1;
	$r->print("<td bgcolor=$fileclr valign=bottom> ".(localtime($filecom[9]))." </td>\n") 
	    if $hash{'display_attrs_1'} == 1;
	$r->print("<td bgcolor=$fileclr valign=bottom> ".(localtime($filecom[10]))." </td>\n") 
	    if $hash{'display_attrs_2'} == 1;

	if ($hash{'display_attrs_3'} == 1) {
	    my $author = &Apache::lonnet::metadata($filelink,'author') if ($metafile == 1);
	    $author = '&nbsp;' if (!$author);
	    $r->print("<td bgcolor=$fileclr valign=bottom> ".$author." </td>\n");
	}
	if ($hash{'display_attrs_4'} == 1) {
	    my $keywords = &Apache::lonnet::metadata($filelink,'keywords') if ($metafile == 1);
	    $keywords = '&nbsp;' if (!$keywords);
	    $r->print("<td bgcolor=$fileclr valign=bottom> ".$keywords." </td>\n");
	}
	if ($hash{'display_attrs_5'} == 1) {
	    my $lang = &Apache::lonnet::metadata($filelink,'language') if ($metafile == 1);
	    $lang = $language{$lang};
	    $lang = '&nbsp;' if (!$lang);
	    $r->print("<td bgcolor=$fileclr valign=bottom> ".$lang." </td>\n");
	}
	$r->print("</tr>\n");
    }
# -- display directory
    if ($fnptr == $dirptr) {
	my @file_ext = split (/\./,$listname);
	my $curfext = $file_ext[scalar(@file_ext)-1];
	my $curdir = $startdir.$filecom[0].'/';
	my $anchor = $curdir;
	$anchor =~ s/\///g;
	$r->print("<tr>$extrafield<td bgcolor=$fileclr valign=bottom>");
	&begin_form ($r,$curdir);
	my $indentm1 = $indent-1;
	if ($indentm1 < 11 and $indentm1 > 0) {
	    $r->print("<img src=",$iconpath,"whitespace",$indentm1,".gif border=0>\n");
	} else {
	    my $ten = int($indentm1/10.);
	    my $rem = $indentm1%10.0;
	    my $count = 0;
	    while ($count < $ten) {
		$r->print ("<img src=",$iconpath,"whitespace10.gif border=0>\n");
		$count++;
	    }
	    $r->print ("<img src=",$iconpath,"whitespace",$rem,".gif border=0>\n") if $rem > 0;
	}
	$r->print ('<a name="'.$anchor.'"><input src="'.$iconpath.'folder_pointer_'.$diropen.'.gif"');
	$r->print (' name="'.$msg.'" height="22" type="image" border="0">'."\n");
	$r->print ('<a href="'.$curdir.'"><img src="'.$iconpath.'folder_'.$diropen.'.gif" border=0></a>'."\n");
	$r->print ("$listname$tabtag</tr></form>\n");
    }

}

# ------------------- prints the beginning of a form for directory or file link
sub begin_form {
    my ($r,$uri) = @_;
    my $anchor = $uri;
    $anchor =~ s/\///g;
    $r->print ('<form method="post" name="dirpath" action="'.$uri.'#'.$anchor.
	       '" enctype="application/x-www-form-urlencoded">'."\n");
    $r->print ($hidden.'<input type=hidden name=openuri value="'.$uri.'">'."\n");
    $r->print ('<input type=hidden name=dirPointer value="on">'."\n");
}

1;
__END__