--- loncom/lontrans.pm	2020/03/05 22:02:32	1.14.10.1
+++ loncom/lontrans.pm	2021/12/14 20:59:19	1.14.10.2
@@ -1,7 +1,7 @@
 # The LearningOnline Network
 # URL translation for User Files
 #
-# $Id: lontrans.pm,v 1.14.10.1 2020/03/05 22:02:32 raeburn Exp $
+# $Id: lontrans.pm,v 1.14.10.2 2021/12/14 20:59:19 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -31,6 +31,7 @@ package Apache::lontrans;
 use strict;
 use Apache::Constants qw(:common :remotehost);
 use Apache::lonnet();
+use Apache::loncommon;
 use Apache::File();
 use LONCAPA;
 
@@ -39,6 +40,93 @@ sub handler {
     my $r = shift;
     # FIXME line remove when mod_perl fixes BUG#4948 
     $r->notes->set('error-notes' => '');
+    my $alias = &Apache::lonnet::get_proxy_alias();
+    if ($alias) {
+        my $hdrhost = $r->headers_in->get('Host');
+        my $lonhost = $r->dir_config('lonHostID');
+        my $hostname = &Apache::lonnet::hostname($lonhost);
+        my $ssourl = '/adm/sso';
+        if ($r->dir_config('lonOtherAuthenUrl') ne '') {
+            $ssourl = $r->dir_config('lonOtherAuthenUrl');
+        }
+        if (($hdrhost eq $alias) || ($hdrhost eq $hostname)) {
+            my $proxyinfo = &Apache::lonnet::get_proxy_settings($r->dir_config('lonDefDomain'));
+            my ($vpnint,$vpnext);
+            if (ref($proxyinfo) eq 'HASH') {
+                $vpnint = $proxyinfo->{'vpnint'};
+                $vpnext = $proxyinfo->{'vpnext'};
+            }
+            my ($redirect,$remote_ip);
+            if ($hdrhost eq $alias) {
+                $remote_ip = &Apache::lonnet::get_requestor_ip($r,REMOTE_NOLOOKUP);
+                if (($vpnext && &Apache::lonnet::ip_match($remote_ip,$vpnext))) {
+                    $redirect = $hostname;
+                }
+                if ($r->uri eq $ssourl) {
+                    if (&Apache::lonnet::alias_sso($lonhost)) {
+                        undef($redirect);
+                    } else {
+                        $redirect = $hostname;
+                    }
+                }
+                if ($redirect eq $hdrhost) {
+                    undef($redirect);
+                }
+            } elsif ($hdrhost eq $hostname) {
+                $remote_ip = &Apache::lonnet::get_requestor_ip($r,REMOTE_NOLOOKUP,1);
+                unless (($remote_ip eq '127.0.0.1') || ($remote_ip eq '::1') ||
+                        ($remote_ip eq &Apache::lonnet::get_host_ip($lonhost)) ||
+                        ($vpnint && &Apache::lonnet::ip_match($remote_ip,$vpnint))) {
+                    $redirect = $alias;
+                    if (($r->uri=~m{^/raw/}) || ($r->uri=~m{^/adm/dns/})) {
+                        my %iphost = &Apache::lonnet::get_iphost();
+                        if (exists($iphost{$remote_ip})) {
+                            undef($redirect);
+                        }
+                    } elsif ($r->uri eq $ssourl) {
+                        unless (&Apache::lonnet::alias_sso($lonhost)) {
+                            undef($redirect);
+                        }
+                    }
+                }
+            }
+            if ($redirect) {
+                my $uri = $r->uri;
+                if (($uri eq '/adm/switchserver') || ($uri =~ m{^/Shibboleth.sso/})) {
+                    return DECLINED;
+                }
+                unless (($uri eq '/adm/migrateuser') || ($uri eq $ssourl)) {
+                    my %user;
+                    my $handle = &Apache::lonnet::check_for_valid_session($r,undef,\%user);
+                    if (($handle) && ($user{'name'} ne '') && ($user{'domain'} ne '')) {
+                        unless (($user{'name'} eq 'public') && ($user{'domain'} eq 'public')) {
+                            my $dest = '/adm/migrateuser';
+                            my $token = &set_token($r,$dest,$remote_ip,\%user);
+                            unless ($token eq '') {
+                                $r->internal_redirect("$dest?token=$token");
+                                $r->set_handlers('PerlHandler'=> undef);
+                                return DECLINED;
+                            }
+                        }
+                    }
+                }
+                my $protocol = 'http';
+                my $port = $r->get_server_port();
+                if ($port eq '443') {
+                    $protocol = 'https';
+                }
+                if ($uri =~ m{^(/adm/css/)(.+)(.css)$}) {
+                    $uri = $1.&escape($2).$3;
+                }
+                my $location = $protocol.'://'.$redirect.$uri;
+                if ($r->args) {
+                    $location .= '?'.$r->args;
+                }
+                $r->header_out(Location => $location);
+                return REDIRECT;
+            }
+        }
+    }
     if ($r->uri=~m|^(/raw)?/uploaded/|) {
         my $fn = $r->uri();
         $fn=~s/^\/raw//;
@@ -61,6 +149,53 @@ sub handler {
     return DECLINED;
 }
 
+sub set_token {
+    my ($r,$dest,$remote_ip,$userref) = @_;
+    my (%info,%user);
+    if ($dest eq '/adm/migrateuser') {
+        return unless (ref($userref) eq 'HASH');
+        %user = %{$userref};
+        %info = ('ip' => $remote_ip,
+                 'domain'    => $user{'domain'},
+                 'username'  => $user{'name'},
+                 'server'    => $r->dir_config('lonHostID'),
+                );
+    }
+    if ($r->args) {
+        foreach my $pair (split(/&/,$r->args)) {
+            my ($name,$value) = split(/=/,$pair);
+            $name = &LONCAPA::unescape($name);
+            next unless (($name eq 'role') || ($name eq 'symb'));
+            $value =~ tr/+/ /;
+            $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
+            $info{$name} = $value;
+        }
+    }
+    if ($dest eq '/adm/migrateuser') {
+        unless ($info{'role'}) {
+            if ($user{'role'} ne '') {
+                $info{'role'} = $user{'role'};
+            }
+        }
+        unless ($info{'symb'}) {
+            unless ($r->uri eq '/adm/roles') {
+                $info{'origurl'} = $r->uri;
+            }
+        }
+    }
+    if (($dest eq '/adm/migrateuser') || (keys(%info) > 0)) {
+        unless ($dest eq '/adm/migrateuser') {
+            $info{'origurl'} = $r->uri;
+        }
+        my $token = &Apache::lonnet::tmpput(\%info,$r->dir_config('lonHostID'),'link');
+        unless (($token eq 'con_lost') || ($token eq 'refused') ||
+                ($token eq 'unknown_cmd') || ($token eq 'no_such_host')) {
+            return $token;
+        }
+    }
+    return;
+}
+
 1;
 __END__