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File:  [LON-CAPA] / loncom / interface / lonchatfetch.pm
Revision 1.6: download - view: text, annotated - select for diffs
Mon Sep 16 20:15:10 2002 UTC (21 years, 7 months ago) by www
Branches: MAIN
CVS tags: version_0_6_2, version_0_6, HEAD
Overload protection - frivolous to generate all of these hits if machine
overloaded.

# The LearningOnline Network
# Chat Fetching
#
# $Id: lonchatfetch.pm,v 1.6 2002/09/16 20:15:10 www 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/
#

package Apache::lonchatfetch;

use strict;
use Apache::Constants qw(:common);
use Apache::lontexconvert;
use Apache::loncommon;
use Apache::lonnet;

sub handler {
    my $r = shift;

    my $loaderror=&Apache::lonnet::overloaderror($r);
    if ($loaderror) { return $loaderror; }
    $loaderror=
       &Apache::lonnet::overloaderror($r,
         $ENV{'course.'.$ENV{'request.course.id'}.'.home'});
    if ($loaderror) { return $loaderror; }

    $r->content_type('text/html');
    $r->send_http_header;
    return OK if $r->header_only;

# ------------------------------------------------------------ retrieve entries

    my $cnum=$ENV{'course.'.$ENV{'request.course.id'}.'.num'};
    my $cdom=$ENV{'course.'.$ENV{'request.course.id'}.'.domain'};
    my $chome=$ENV{'course.'.$ENV{'request.course.id'}.'.home'};

    my @entries=split(/\:/,
                       &Apache::lonnet::reply("chatretr:$cdom:$cnum",$chome));
    my ($lastid)=($entries[$#entries]=~/^(\w+)/);
    my ($thentime,$idnum)=split(/\_/,$lastid);
# ----------------------------------------------------------- Can see identity?
    my $crs='/'.$ENV{'request.course.id'};
    if ($ENV{'request.course.sec'}) {
       $crs.='_'.$ENV{'request.course.sec'};
    }                 
    $crs=~s/\_/\//g;
    my $seeid=&Apache::lonnet::allowed('rin',$crs);
# -------------------------------------------------------- see which ones apply
    &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['lastid']);
    my $include=0;
    my $newstuff='';
    my $bottomid='';
    unless ($ENV{'form.lastid'}) { 
       $include=1; 
       $newstuff='<html><body bgcolor="#FFFFFF">';
    }
    foreach (@entries) {
	if ($include) {
            my ($id,$msg)=split(/\:/,&Apache::lonnet::unescape($_));
            chomp($msg);
            my ($msgtime,$msgnum)=split(/\_/,$id);
            my ($sdom,$snum,$anon,$contrib)=split(/\:/,
                                              &Apache::lonnet::unescape($msg));
            $contrib=&Apache::lonnet::unescape($contrib);
            $contrib=~s/\n/\<br \/\>/g;
	    $contrib=&Apache::lontexconvert::msgtexconverted($contrib);
            $contrib=~s/\n/ /g;
            $contrib=~s/\'/\&\#39\;/g;
            my $sender='';
            if ($seeid) {
               $sender=&Apache::loncommon::plainname($snum,$sdom);
               my $nick=&Apache::loncommon::nickname($snum,$sdom);
               if (($nick) && ($nick ne $sender)) {
		   $sender.=' '.$nick;
               }
	       if ($anon) { $sender.=' [Anon]' };
            } elsif (!$anon) {
               $sender=&Apache::loncommon::nickname($snum,$sdom);
            } else {
		$sender=&Apache::loncommon::screenname($snum,$sdom);
                unless ($sender) { $sender="Anonymous"; }
            }
            $sender=~s/\'/\"/g;
            my $color=$sender;
            $color=~tr/a-j/0-9/;
            $color=~tr/A-J/0-9/;
            $color=~tr/k-t/0-9/;
            $color=~tr/K-T/0-9/;
            $color=~tr/u-z/0-5/;
            $color=~tr/U-Z/0-5/;
            $color=~s/\D//g;
            $color=substr($color,0,6);
            my $timestamp=localtime($msgtime);
            my ($mhour,$mmin,$msec)=($timestamp=~/(\d\d)\:(\d\d)\:(\d\d)/);
	    $newstuff.='<font color="#'.$color.'"><a name="'.$id.'"><b>'.
                       $sender.'</b> ('.$mhour.':'.$mmin.':'.$msec.'): '.
                       $contrib."</font><br>";
            $bottomid=$id;
        } else {
            $_=~/^(\w+)/;
            if ($1 eq $ENV{'form.lastid'}) { $include=1; }
        }
    }
    $r->print(<<ENDDOCUMENT);
<html>
<head>
<title>The LearningOnline Network with CAPA</title>
  <meta HTTP-EQUIV="Refresh" CONTENT="5; url=/adm/chatfetch?lastid=$lastid">
</head>
<body bgcolor="#FFFFFF">
<script>
parent.chatout.document.writeln('$newstuff');
parent.chatout.scroll(0,10000000);
</script>
</body>
</html>
ENDDOCUMENT
    return OK;
} 

1;
__END__
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