--- loncom/auth/migrateuser.pm	2013/06/06 12:39:06	1.17
+++ loncom/auth/migrateuser.pm	2013/09/29 00:49:24	1.18
@@ -1,7 +1,7 @@
 # The LearningOnline Network
 # Starts a user off based of an existing token.
 #
-# $Id: migrateuser.pm,v 1.17 2013/06/06 12:39:06 raeburn Exp $
+# $Id: migrateuser.pm,v 1.18 2013/09/29 00:49:24 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -34,6 +34,7 @@ use Apache::Constants qw(:common :http :
 use Apache::lonauth;
 use Apache::lonnet;
 use Apache::lonlocal;
+use Apache::lonlogin();
 
 sub goto_login {
     my ($r) = @_;
@@ -52,16 +53,126 @@ sub goto_login {
 sub sso_check {
     my ($data) = @_;
     my %extra_env;
-    if ($data->{'sso.login'}) {
-	$extra_env{'request.sso.login'} = $data->{'sso.login'};
-    }
-    if ($data->{'sso.reloginserver'}) {
-        $extra_env{'request.sso.reloginserver'} = 
-            $data->{'sso.reloginserver'};
+    if (ref($data) eq 'HASH') {
+        if ($data->{'sso.login'}) {
+            $extra_env{'request.sso.login'} = $data->{'sso.login'};
+        }
+        if ($data->{'sso.reloginserver'}) {
+            $extra_env{'request.sso.reloginserver'} = 
+                $data->{'sso.reloginserver'};
+        }
     }
     return \%extra_env;
 }
 
+sub ip_changed {
+    my ($r,$udom,$camefrom,$dataref) = @_;
+    &Apache::loncommon::content_type($r,'text/html');
+    $r->send_http_header;
+    if (ref($dataref) eq 'HASH') {
+        my $title = 'LON-CAPA Session redirected';
+        my $message = &mt('Your internet address has changed since you logged in.');  
+        my $camefrom = &Apache::lonnet::hostname($dataref->{'server'});
+        my $frombalancer = $dataref->{'balancer'};
+        my $rule_in_effect;
+        if ($frombalancer) {
+            my $balancerdom = &Apache::lonnet::host_domain($dataref->{'server'});
+            my ($result,$cached)=&Apache::lonnet::is_cached_new('loadbalancing',$balancerdom);
+            unless (defined($cached)) {
+                my $cachetime = 60*60*24; 
+                my %domconfig =
+                    &Apache::lonnet::get_dom('configuration',['loadbalancing'],$balancerdom);
+                if (ref($domconfig{'loadbalancing'}) eq 'HASH') {
+                    $result = &Apache::lonnet::do_cache_new('loadbalancing',$balancerdom,
+                                                            $domconfig{'loadbalancing'},$cachetime);
+                }
+            }
+            if (ref($result) eq 'HASH') {
+                (undef,my $currtargets,my $currrules) =
+                    &Apache::lonnet::check_balancer_result($result,$dataref->{'server'});
+                if (ref($currrules) eq 'HASH') {
+                    if ($dataref->{'sso.login'}) {
+                        if ($currrules->{'_LC_ipchangesso'} ne '') {
+                            $rule_in_effect = $currrules->{'_LC_ipchangesso'};
+                        }
+                    } else {
+                        if ($currrules->{'_LC_ipchange'} ne '') {
+                            $rule_in_effect = $currrules->{'_LC_ipchange'};
+                        }
+                    }
+                }
+            }
+        }
+        my $url;
+        my $lonhost= $r->dir_config('lonHostID');
+        my $switchto = $lonhost;
+        if ($rule_in_effect eq 'balancer') {
+            my $hosthere;
+            if ($dataref->{'role'}) {
+                my ($adom,$aname);
+                if ($dataref->{'role'} =~ m{^au\./($match_domain)/$}) {
+                    $adom = $1;
+                    $aname = $dataref->{'username'};
+                } elsif ($dataref->{'role'} =~ m{^(?:ca|aa)\./($match_domain)/($match_username)$}) {
+                    $adom = $1;
+                    $aname = $2;
+                }
+                if ($adom ne '' && $aname ne '') {
+                    my $ahome = &Apache::lonnet::homeserver($aname,$adom);
+                    unless ($ahome eq 'no_host') {
+                        my @ids=&Apache::lonnet::current_machine_ids();
+                        if ($ahome && grep(/^\Q$ahome\E$/,@ids)) {
+                            $hosthere = 1;
+                        }
+                    }
+                }
+            }
+            unless ($hosthere) { 
+                my $hostname = &Apache::lonnet::hostname($dataref->{'server'});
+                if ($hostname) {
+                    $switchto = $dataref->{'server'};
+                    my $protocol = $Apache::lonnet::protocol{$switchto};
+                    $protocol = 'http' if ($protocol ne 'https');
+                    $url = $protocol.'://'.$hostname;
+                    $message .= '<br />'.
+                                &mt('As a result, your LON-CAPA session is being redirected to the server where you originally logged in.');
+                }
+            }
+        }
+        if ($dataref->{'sso.login'}) {
+            $url .= '/adm/roles?';
+        } else {
+            $url .= '/adm/login?';
+            $message .= '<br />'.&mt('You will need to provide your password one more time');
+        }
+        my %info= (
+                    'domain'          => $dataref->{'domain'},
+                    'username'        => $dataref->{'username'},
+                    'role'            => $dataref->{'role'},
+                    'sessionserver'   => $lonhost,
+                  );
+        if ($dataref->{'origurl'}) {
+            $info{'origurl'} = $dataref->{'origurl'};
+        }
+        if ($dataref->{'symb'}) {
+            $info{'symb'} = $dataref->{'symb'};
+        }
+        my $iptoken = &Apache::lonnet::tmpput(\%info,$switchto);
+        unless ($iptoken eq 'conlost') {
+            $url .= 'iptoken='.$iptoken;
+        }
+        $r->print(&Apache::loncommon::start_page($title,undef,
+                                                 {'redirect' =>
+                                                  [2,$url],}).
+                  '<h1>'.&mt('One moment please...').'</h1>'.
+                  '<p class="LC_warning">'.$message.'</p>'.
+                  &Apache::loncommon::end_page());
+    } else {
+        return &goto_login($r);
+    }
+    return OK;
+}
+
 sub handler {
     my ($r) = @_;
     
@@ -78,9 +189,11 @@ sub handler {
 	return &goto_login($r);
     }
 
-    if ($data{'ip'} ne $ENV{'REMOTE_ADDR'} || !defined($data{'username'}) ||
-	!defined($data{'domain'}) ) {
-	return &goto_login($r);
+    if (!defined($data{'username'}) || !defined($data{'domain'})) {
+        return &goto_login($r);
+    }
+    if ($data{'ip'} ne $ENV{'REMOTE_ADDR'}) {
+	return &ip_changed($r,$data{'domain'},$data{'server'},\%data);
     }
 
     &Apache::lonnet::logthis("Allowing access for $data{'username'}:$data{'domain'} to $data{'role'}");