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- Fix logic.

# The LearningOnline Network
# URL translation for User Files
#
# $Id: lontrans.pm,v 1.24 2018/07/26 19:01:25 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 :http);
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 
    $r->notes->set('error-notes' => '');
    if ($r->uri =~ m{^/+tiny/+($match_domain)/+(\w+)$}) {
        my ($cdom,$key) = ($1,$2);
        if (&Apache::lonnet::domain($cdom) ne '') {
            my %user;
            my $handle = &Apache::lonnet::check_for_valid_session($r,undef,\%user);
            if ($handle ne '') {
                my $lonidsdir=$r->dir_config('lonIDsDir');
                &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
                if ($env{'request.course.id'}) {
                    my $tinyurl;
                    my ($result,$cached)=&Apache::lonnet::is_cached_new('tiny',$cdom."\0".$key);
                    if (defined($cached)) {
                        $tinyurl = $result;
                    } else {
                        my $configuname = &Apache::lonnet::get_domainconfiguser($cdom);
                        my %currtiny = &Apache::lonnet::get('tiny',[$key],$cdom,$configuname);
                        if ($currtiny{$key} ne '') {
                            $tinyurl = $currtiny{$key};
                            &Apache::lonnet::do_cache_new('tiny',$cdom."\0".$key,$currtiny{$key},600);
                        }
                    }
                    if ($tinyurl ne '') {
                        my ($cnum,$symb) = split(/\&/,$tinyurl);
                        if (($cnum =~ /^$match_courseid$/) &&
                            (&Apache::lonnet::homeserver($cnum,$cdom) ne 'no_host')) {
                            if ($env{'request.course.id'} eq $cdom.'_'.$cnum) {
                                my ($map,$resid,$url) = &Apache::lonnet::decode_symb($symb);
                                if (&Apache::lonnet::is_on_map($url)) {
                                    my $realuri;
                                    if ((&Apache::lonnet::EXT('resource.0.hiddenresource',$symb) =~ /^yes$/i) &&
                                        (!$env{'request.role.adv'})) {
                                        $env{'user.error.msg'}=$r->uri.':bre:1:1:Access to resource denied';
                                        return HTTP_NOT_ACCEPTABLE;
                                    }
                                    if ((&Apache::lonnet::EXT('resource.0.encrypturl',$symb) =~ /^yes$/i) &&
                                        (!$env{'request.role.adv'})) {
                                        $realuri = &Apache::lonenc::encrypted(&Apache::lonnet::clutter($url));
                                        if (($url =~ /\.sequence$/) &&
                                            ($env{'course.'.$env{'request.course.id'}.'.type'} ne 'Placement')) {
                                            $realuri .= '?navmap=1';
                                        } else {
                                            $realuri .= '?symb='.&Apache::lonenc::encrypted($symb);
                                        }
                                    } else {
                                        $realuri = &Apache::lonnet::clutter($url);
                                        if (($url =~ /\.sequence$/) &&
                                            ($env{'course.'.$env{'request.course.id'}.'.type'} ne 'Placement')) {
                                            $realuri .= '?navmap=1'; 
                                        } else {
                                            $realuri .= '?symb='.$symb;
                                        }
                                    }
                                    my $host = $r->headers_in->get('Host');
                                    if ($r->is_initial_req() || !$host) {
                                        $r->internal_redirect($realuri);
                                        return OK;
                                    } else {
                                        my $protocol = 'http';
                                        if ($r->get_server_port == 443) {
                                            $protocol = 'https';
                                        }
                                        my $location = $protocol.'://'.$host.$realuri;
                                        $r->headers_out->set(Location => $location);
                                        return REDIRECT;
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
    } elsif ($r->uri=~m{^/raw/}) {
        my $host = $r->headers_in->get('Host');
        if ($host) {
            unless ($host =~ /^internal\-/) {
                my $remote_ip = $r->get_remote_host();
                my $lonhost = $r->dir_config('lonHostID');
                if (&redirect_raw($remote_ip,$lonhost)) {
                    my $location = 'https://internal-'.$host.$r->uri;
                    $r->headers_out->set(Location => $location);
                    return REDIRECT;
                }
            }
        }
    }
    if ($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;
    } else {
        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__

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