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- Read from the filesystem instead of using LWP request when current server
  is an "authoritative" server in hosts.tab, to prevent delays on Apache
  reload for standalone machines.

# The LearningOnline Network with CAPA
# A debugging harness.
#
# $Id: londns.pm,v 1.7 2021/06/06 23:14:18 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/
#
#

package Apache::londns;

use strict;
use LONCAPA;
use Apache::Constants qw(:common :http :remotehost);
use Apache::lonnet;

sub serve_file {
    my ($r,$dir,$file,$type)=@_;
    if (($dir eq '') || ($file eq '')) {
        return FORBIDDEN;
    }
    if (open(my $config,"<","$dir/$file")) {
        my $contents = join('',<$config>);
        close($config);
        $r->content_type($type);
        $r->send_http_header;
        return OK if $r->header_only;
        $r->print($contents);
        return OK;
    } else {
        return FORBIDDEN;
    }
}

sub handler {
    my ($r) = @_;

    my $reqhost = $r->get_remote_host(REMOTE_NOLOOKUP);
    my @hostids= &Apache::lonnet::get_hosts_from_ip($reqhost);
    if (!@hostids && $reqhost ne '127.0.0.1' ) {
        $r->log_reason("Unable to find a host for ".
                       $r->get_remote_host(REMOTE_NOLOOKUP));
        return FORBIDDEN;
    }

    my $command = (split('/',$r->uri))[3];
    my ($dir,$file) = &Apache::lonnet::parse_getdns_url($command,$r->uri);
    my %types = (
                    hosts      => 'loncapa/hosts',
                    domain     => 'loncapa/domain',
                    checksums  => 'loncapa/versions',
                    loncapaCRL => 'application/x-pem-file',
                );
    if (exists($types{$command})) {
        return &serve_file($r,$dir,$file,$types{$command});
    }
    return FORBIDDEN;
}


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