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- Retrieval of requestor's IP address centralized in lonnet::get_requestor_ip()
- Domain configuration to allow domain's LON-CAPA nodes to operate behind a
  WAF/Reverse Proxy using aliased hostname (CNAME).
- Web requests from other nodes bypass the WAF as their requests are made
  directly to the server hostname (A record); same for internal LON-CAPA
  connections for lonc -> lond.

# The LearningOnline Network
# URL translation for User Files
#
# $Id: lontrans.pm,v 1.27 2020/12/18 15:23:04 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::lontrans;

use strict;
use Apache::Constants qw(:common :remotehost REDIRECT);
use Apache::lonnet;
use Apache::File();
use LONCAPA qw(:DEFAULT :match);

sub handler {
    my $r = shift;
    # FIXME line remove when mod_perl fixes BUG#4948
    $r->notes->set('error-notes' => '');
    my $actualhost = $r->headers_in->get('Host');
    if ($r->uri=~m{^/raw/}) {
        if ($actualhost) {
            unless ($host =~ /^internal\-/) {
                my $remote_ip = &Apache::lonnet::get_requestor_ip($r,REMOTE_NOLOOKUP,1);
                my $lonhost = $r->dir_config('lonHostID');
                if (&redirect_raw($remote_ip,$lonhost)) {
                    my $location = 'https://internal-'.$host.$r->uri;
                    $r->headers_out->set(Location => $location);
                    return REDIRECT;
                }
            }
        }
    }
    my $alias = &Apache::lonnet::get_proxy_alias();
    if ($alias) {
        my $lonhost = $r->dir_config('lonHostID');
        my $expected_host = &Apache::lonnet::hostname($lonhost);
        if (($actualhost eq $expected_host) && ($actualhost ne $alias)) {
            my $remote_ip = &Apache::lonnet::get_requestor_ip($r,REMOTE_NOLOOKUP,1);
            unless ($remote_ip eq '127.0.0.1') {
                my $hostip = &Apache::lonnet::get_host_ip($lonhost);
                unless ($remote_ip eq $hostip) {
                    my $do_redirect = 1;
                    if ($r->uri=~m{^/raw/}){
                        my %iphost = &Apache::lonnet::get_iphost();
                        if (exists($iphost{$remote_ip})) {
                            undef($do_redirect);
                        }
                    }
                    if ($do_redirect) {
                        my $uri = $r->uri;
                        my $protocol = 'http';
                        my $port = $r->get_server_port();
                        if ($port eq '443') {
                            $protocol = 'https';
                        }
                        $r->header_out(Location => $protocol.'://'.$alias.$uri);
                        return REDIRECT;
                    }
                }
            }
        }
    }
    if ($r->uri=~m|^(/raw)?/uploaded/|) {
        my $fn = $r->uri();
        $fn=~s/^\/raw//;
        my (undef,undef,$udom,$uname,@ufile)=split(/\//,$fn);
	if (@ufile) { $ufile[-1]=~s/^[\~\.]+//; }
        my $chome=&Apache::lonnet::homeserver($uname,$udom);
	my $allowed=0;
	my @ids=&Apache::lonnet::current_machine_ids();
	foreach my $id (@ids) { if ($id eq $chome) { $allowed=1; } }
	if ($allowed) {
	    $r->filename(&propath($udom,$uname).
			 '/userfiles/'.(join('/',@ufile)));
        }
        return OK;
    } elsif ($r->uri =~ m{^\Q/adm/wrapper/ext/https:/\E[^/]}) {
        my $uri = $r->uri;
        $uri =~ s{^(\Q/adm/wrapper/ext/https:/\E)}{$1/};
        $r->uri($uri);
    }
    return DECLINED;
}

sub redirect_raw {
    my ($remote_ip,$lonhost) = @_;
    my @remhostids = &Apache::lonnet::get_hosts_from_ip($remote_ip);
    my $redirect;
    while (@remhostids) {
        my $try_server = pop(@remhostids);
        my $remhostname = &Apache::lonnet::hostname($try_server);
        if ($remhostname) {
            my $remoterev = &Apache::lonnet::get_server_loncaparev(undef,$try_server);
            my ($remmajor,$remminor) = ($remoterev =~ /^(\d+)\.(\d+)/);
            if (($remmajor > 2) || (($remmajor == 2) && $remminor >= 12)) {
                my $internet_names = &Apache::lonnet::get_internet_names($try_server);
                if (ref($internet_names) eq 'ARRAY') {
                    my $intdom = &Apache::lonnet::internet_dom($lonhost);
                    unless (grep(/^\Q$intdom\E$/,@{$internet_names})) {
                        my $lonhostname = &Apache::lonnet::hostname($lonhost);
                        my $serverhomeID = &Apache::lonnet::get_server_homeID($lonhostname);
                        my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
                        my %domdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
                        my $replication = $domdefaults{'replication'};
                        if (ref($replication) eq 'HASH') {
                            my $remhomeID = &Apache::lonnet::get_server_homeID($remhostname);
                            my $remhomedom = &Apache::lonnet::host_domain($remhomeID);
                            my $remprimary = &Apache::lonnet::domain($remhomedom,'primary');
                            my $remintdom = &Apache::lonnet::internet_dom($remprimary);
                            if (ref($replication->{'certreq'}) eq 'ARRAY') {
                                if (grep(/^\Q$remintdom\E$/,@{$replication->{'certreq'}})) {
                                    $redirect = 0;
                                } else {
                                    $redirect = 1;
                                }
                            }
                            if (ref($replication->{'nocertreq'}) eq 'ARRAY') {
                                if (grep(/^\Q$remintdom\E$/,@{$replication->{'nocertreq'}})) {
                                    $redirect = 1;
                                } else {
                                    $redirect = 0;
                                }
                            }
                        }
                    }
                }
            }
            last;
        }
    }
    return $redirect;
}

1;
__END__