--- loncom/auth/lonlogin.pm	2019/01/27 16:02:43	1.179
+++ loncom/auth/lonlogin.pm	2021/09/28 21:16:07	1.187
@@ -1,7 +1,7 @@
 # The LearningOnline Network
 # Login Screen
 #
-# $Id: lonlogin.pm,v 1.179 2019/01/27 16:02:43 raeburn Exp $
+# $Id: lonlogin.pm,v 1.187 2021/09/28 21:16:07 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -47,7 +47,7 @@ sub handler {
 	(join('&',$ENV{'QUERY_STRING'},$env{'request.querystring'},
 	      $ENV{'REDIRECT_QUERY_STRING'}),
 	 ['interface','username','domain','firsturl','localpath','localres',
-	  'token','role','symb','iptoken','btoken','ltoken','linkkey']);
+	  'token','role','symb','iptoken','btoken','ltoken','linkkey','saml']);
     if (!defined($env{'form.firsturl'})) {
         &Apache::lonacc::get_posted_cgi($r,['firsturl']);
     }
@@ -123,7 +123,7 @@ sub handler {
             $protocol = 'http' if ($protocol ne 'https');
             my $dest = '/adm/roles';
             if ($env{'form.firsturl'} ne '') {
-                $dest = $env{'form.firsturl'};
+                $dest = &HTML::Entities::encode($env{'form.firsturl'},'\'"<>&');
             }
             my %info = (
                          balcookie => $lonhost.':'.$balancer_cookie,
@@ -141,7 +141,11 @@ sub handler {
             }
             my $balancer_token = &Apache::lonnet::tmpput(\%info,$found_server);
             if ($balancer_token) {
-                $dest .=  (($dest=~/\?/)?'&;':'?') . 'btoken='.$balancer_token;
+                $dest .=  (($dest=~/\?/)?'&amp;':'?') . 'btoken='.$balancer_token;
+            }
+            unless ($found_server eq $lonhost) {
+                my $alias = &Apache::lonnet::use_proxy_alias($r,$found_server);
+                $hostname = $alias if ($alias ne '');
             }
             my $url = $protocol.'://'.$hostname.$dest;
             my $start_page =
@@ -199,7 +203,7 @@ sub handler {
 	    &Apache::loncommon::end_page();
         my $dest = '/adm/roles';
         if ($env{'form.firsturl'} ne '') {
-            $dest = $env{'form.firsturl'};
+            $dest = &HTML::Entities::encode($env{'form.firsturl'},'\'"<>&');
         }
         if (($env{'form.ltoken'}) || ($linkprot)) {
             unless ($linkprot) {
@@ -425,22 +429,36 @@ sub handler {
             &Apache::lonnet::logthis('No valid logtoken for log-in page -- unable to determine hostname for hostID: '.$lonhost.'. Check entry in hosts.tab');
         }
         my $spares='';
-	my $last;
-        foreach my $hostid (sort
-			    {
-				&Apache::lonnet::hostname($a) cmp
-				    &Apache::lonnet::hostname($b);
-			    }
-			    keys(%Apache::lonnet::spareid)) {
+        my (@sparehosts,%spareservers);
+        my $sparesref = &Apache::lonnet::this_host_spares($defdom);
+        if (ref($sparesref) eq 'HASH') {
+            foreach my $key (keys(%{$sparesref})) {
+                if (ref($sparesref->{$key}) eq 'ARRAY') {
+                    my @sorted = sort { &Apache::lonnet::hostname($a) cmp
+                                        &Apache::lonnet::hostname($b);
+                                      } @{$sparesref->{$key}};
+                    if (@sorted) {
+                        if ($key eq 'primary') {
+                            unshift(@sparehosts,@sorted);
+                        } elsif ($key eq 'default') {
+                            push(@sparehosts,@sorted);
+                        }
+                    }
+                }
+            }
+        }
+        foreach my $hostid (@sparehosts) {
             next if ($hostid eq $lonhost);
 	    my $hostname = &Apache::lonnet::hostname($hostid);
-	    next if (($last eq $hostname) || ($hostname eq ''));
-            $spares.='<br /><font size="+1"><a href="http://'.
+	    next if (($hostname eq '') || ($spareservers{$hostname}));
+            $spareservers{$hostname} = 1;
+            my $protocol = $Apache::lonnet::protocol{$hostid};
+            $protocol = 'http' if ($protocol ne 'https');
+            $spares.='<br /><span style="font-size: larger;"><a href="'.$protocol.'://'.
                 $hostname.
                 '/adm/login?domain='.$authdomain.'">'.
                 $hostname.'</a>'.
-                ' '.&mt('(preferred)').'</font>'.$/;
-	    $last=$hostname;
+                ' '.&mt('(preferred)').'</span>'.$/;
         }
         if ($spares) {
             $spares.= '<br />';
@@ -452,23 +470,26 @@ sub handler {
 			    &Apache::lonnet::hostname($b);
 		    }
 		    keys(%all_hostnames)) {
-            next if ($hostid eq $lonhost || $Apache::lonnet::spareid{$hostid});
+            next if ($hostid eq $lonhost);
             my $hostname = &Apache::lonnet::hostname($hostid);
-            next if (($last eq $hostname) || ($hostname eq ''));
-            $spares.='<br /><a href="http://'.
+            next if (($hostname eq '') || ($spareservers{$hostname}));
+            $spareservers{$hostname} = 1;
+            my $protocol = $Apache::lonnet::protocol{$hostid};
+            $protocol = 'http' if ($protocol ne 'https');
+            $spares.='<br /><a href="'.$protocol.'://'.
 	             $hostname.
 	             '/adm/login?domain='.$authdomain.'">'.
 	             $hostname.'</a>';
-            $last=$hostname;
          }
          $r->print(
-   '<html>'
-  .'<head><title>'
+   '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">'
+  .'<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">'
+  .'<head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>'
   .&mt('The LearningOnline Network with CAPA')
   .'</title></head>'
   .'<body bgcolor="#FFFFFF">'
   .'<h1>'.&mt('The LearningOnline Network with CAPA').'</h1>'
-  .'<img src="/adm/lonKaputt/lonlogo_broken.gif" align="right" />'
+  .'<img src="/adm/lonKaputt/lonlogo_broken.gif" alt="broken icon" align="right" />'
   .'<h3>'.&mt('This LON-CAPA server is temporarily not available for login.').'</h3>');
         if ($spares) {
             $r->print('<p>'.&mt('Please attempt to login to one of the following servers:')
@@ -560,17 +581,9 @@ function enableInput() {
 
 ENDSCRIPT
 
-# --------------------------------------------------- Print login screen header
-
-    my %add_entries = (
-	       bgcolor      => "$mainbg",
-	       text         => "$font",
-	       link         => "$link",
-	       vlink        => "$vlink",
-	       alink        => "$alink",
-               onload       => 'javascript:enableInput();',);
-
-    my ($lonhost_in_use,$headextra,$headextra_exempt,@hosts,%defaultdomconf);
+    my ($lonhost_in_use,@hosts,%defaultdomconf,$saml_prefix,$saml_landing,
+        $samlssotext,$samlnonsso,$samlssoimg,$samlssoalt,$samlssourl,$samltooltip);
+    %defaultdomconf = &Apache::loncommon::get_domainconf($defdom);
     @hosts = &Apache::lonnet::current_machine_ids();
     $lonhost_in_use = $lonhost;
     if (@hosts > 1) {
@@ -581,14 +594,74 @@ ENDSCRIPT
             }
         }
     }
-    %defaultdomconf = &Apache::loncommon::get_domainconf($defdom);
+    $saml_prefix = $defdom.'.login.saml_';
+    if ($defaultdomconf{$saml_prefix.$lonhost_in_use}) {
+        $saml_landing = 1;
+        $samlssotext = $defaultdomconf{$saml_prefix.'text_'.$lonhost_in_use};
+        $samlnonsso = $defaultdomconf{$saml_prefix.'notsso_'.$lonhost_in_use};
+        $samlssoimg = $defaultdomconf{$saml_prefix.'img_'.$lonhost_in_use};
+        $samlssoalt = $defaultdomconf{$saml_prefix.'alt_'.$lonhost_in_use};
+        $samlssourl = $defaultdomconf{$saml_prefix.'url_'.$lonhost_in_use};
+        $samltooltip = $defaultdomconf{$saml_prefix.'title_'.$lonhost_in_use};
+    }
+    if ($saml_landing) {
+       if ($samlssotext eq '') {
+           $samlssotext = 'SSO Login';
+       }
+       if ($samlnonsso eq '') {
+           $samlnonsso = 'Non-SSO Login';
+       }
+       $js .= <<"ENDSAMLJS";
+
+<script type="text/javascript">
+// <![CDATA[
+function toggleLClogin() {
+    if (document.getElementById('LC_standard_login')) {
+        if (document.getElementById('LC_standard_login').style.display == 'none') {
+            document.getElementById('LC_standard_login').style.display = 'inline-block';
+            if (document.getElementById('LC_login_text')) {
+                document.getElementById('LC_login_text').innerHTML = '$samlnonsso';
+            }
+            if (document.getElementById('LC_SSO_login')) {
+                document.getElementById('LC_SSO_login').style.display = 'none';
+            }
+        } else {
+            document.getElementById('LC_standard_login').style.display = 'none';
+            if (document.getElementById('LC_login_text')) {
+                document.getElementById('LC_login_text').innerHTML = '$samlssotext';
+            }
+            if (document.getElementById('LC_SSO_login')) {
+                document.getElementById('LC_SSO_login').style.display = 'inline-block';
+            }
+        }
+    }
+    return;
+}
+
+// ]]>
+</script>
+
+ENDSAMLJS
+    }
+
+# --------------------------------------------------- Print login screen header
+
+    my %add_entries = (
+	       bgcolor      => "$mainbg",
+	       text         => "$font",
+	       link         => "$link",
+	       vlink        => "$vlink",
+	       alink        => "$alink",
+               onload       => 'javascript:enableInput();',);
+
+    my ($headextra,$headextra_exempt);
     $headextra = $defaultdomconf{$defdom.'.login.headtag_'.$lonhost_in_use};
     $headextra_exempt = $defaultdomconf{$domain.'.login.headtag_exempt_'.$lonhost_in_use};
     if ($headextra) {
         my $omitextra;
         if ($headextra_exempt ne '') {
             my @exempt = split(',',$headextra_exempt);
-            my $ip = $ENV{'REMOTE_ADDR'};
+            my $ip = &Apache::lonnet::get_requestor_ip();
             if (grep(/^\Q$ip\E$/,@exempt)) {
                 $omitextra = 1;
             }
@@ -626,6 +699,7 @@ ENDSCRIPT
           'helpdesk' => 'Contact Helpdesk',
           'forgotpw' => 'Forgot password?',
           'newuser'  => 'New User?',
+          'change'   => 'Change?',
        );
 # -------------------------------------------------- Change password field name
 
@@ -687,7 +761,7 @@ ENDSERVERFORM
         $mobileargs = 'autocapitalize="off" autocorrect="off"'; 
     }
     my $loginform=(<<LFORM);
-<form name="client" action="" onsubmit="return(send())">
+<form name="client" action="" onsubmit="return(send())" id="lclogin">
   <input type="hidden" name="lextkey" value="$lextkey" />
   <input type="hidden" name="uextkey" value="$uextkey" />
   <b><label for="uname">$lt{'un'}</label>:</b><br />
@@ -708,8 +782,57 @@ LFORM
 </div>
 HEADER
     }
-    $r->print(<<ENDTOP);
-<div style="float:left;margin-top:0;">
+
+    my $stdauthformstyle = 'inline-block';
+    my $ssoauthstyle = 'none';
+    my $logintype;
+    $r->print('<div style="float:left;margin-top:0;">');
+    if ($saml_landing) {
+        $ssoauthstyle = 'inline-block';
+        $stdauthformstyle = 'none';
+        $logintype = $samlssotext;
+        my $ssologin = '/adm/sso';
+        if ($samlssourl  ne '') {
+            $ssologin = $samlssourl;
+        }
+        if ($env{'form.firsturl'} ne '') {
+            $ssologin .= (($ssologin=~/\?/)?'&amp;':'?') .
+                         'origurl='.&HTML::Entities::encode($env{'form.firsturl'},'\'<>&"');
+        }
+        my $ssohref;
+        if ($samlssoimg ne '') {
+            $ssohref = '<a href="'.$ssologin.'" title="'.$samltooltip.'"><img src="'.$samlssoimg.'" alt="'.$samlssoalt.'" /></a>';
+        } else {
+            $ssohref = '<a href="'.$ssologin.'">'.$samlssotext.'</a>';
+        }
+        if (($env{'form.saml'} eq 'no') ||
+            (($env{'form.username'} ne '') && ($env{'form.domain'} ne ''))) {
+            $ssoauthstyle = 'none';
+            $stdauthformstyle = 'inline-block';
+            $logintype = $samlnonsso;
+        }
+        $r->print(<<ENDSAML);
+<p>
+Log-in type:
+<span style="font-weight:bold" id="LC_login_text">$logintype</span><br />
+<span><a href="javascript:toggleLClogin();" style="color:#000000">$lt{'change'}</a></span>
+</p>
+<div style="display:$ssoauthstyle" id="LC_SSO_login">
+<div class="LC_Box" style="padding-top: 10px;">
+$ssohref
+$noscript_warning
+</div>
+<div class="LC_Box" style="padding-top: 10px;">
+$loginhelp
+$contactblock
+$coursecatalog
+</div>
+</div>
+ENDSAML
+    }
+
+    $r->print(<<ENDLOGIN);
+<div style="display:$stdauthformstyle;" id="LC_standard_login">
 <div class="LC_Box" style="background:$loginbox_bg;">
   $logintitle
   $loginform
@@ -725,8 +848,8 @@ HEADER
 </div>
 </div>
 
-<div>
-ENDTOP
+ENDLOGIN
+    $r->print('</div><div>'."\n");
     if ($showmainlogo) {
         $r->print(' <img src="'.$logo.'" alt="" class="LC_maxwidth" />'."\n");
     }
@@ -831,7 +954,7 @@ sub check_loginvia {
     my $output;
     if ($loginvia ne '') {
         my $noredirect;
-        my $ip = $ENV{'REMOTE_ADDR'};
+        my $ip = &Apache::lonnet::get_requestor_ip();   
         if ($ip eq '127.0.0.1') {
             $noredirect = 1;
         } else {
@@ -899,12 +1022,12 @@ sub redirect_page {
     }
     my $url = $protocol.'://'.$hostname.$path;
     if ($env{'form.firsturl'} ne '') {
-        $url .='?firsturl='.$env{'form.firsturl'};
+        $url .='?firsturl='.&HTML::Entities::encode($env{'form.firsturl'},'\'"<>&');;
     }
     if ($linkprot) {
         my $ltoken = &Apache::lonnet::tmpput({linkprot => $linkprot},$desthost);
         if ($ltoken) {
-            $url .= (($url =~ /\?/) ? '&' : '?').'ltoken='.$ltoken;
+            $url .= (($url =~ /\?/) ? '&amp;' : '?').'ltoken='.$ltoken;
         }
     }
     my $start_page = &Apache::loncommon::start_page('Switching Server ...',undef,