--- loncom/auth/lonlogin.pm	2018/07/04 16:58:19	1.173
+++ loncom/auth/lonlogin.pm	2019/01/27 16:02:43	1.179
@@ -1,7 +1,7 @@
 # The LearningOnline Network
 # Login Screen
 #
-# $Id: lonlogin.pm,v 1.173 2018/07/04 16:58:19 raeburn Exp $
+# $Id: lonlogin.pm,v 1.179 2019/01/27 16:02:43 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -37,7 +37,7 @@ use Apache::lonauth();
 use Apache::lonlocal;
 use Apache::migrateuser();
 use lib '/home/httpd/lib/perl/';
-use LONCAPA;
+use LONCAPA qw(:DEFAULT :match);
 use CGI::Cookie();
  
 sub handler {
@@ -47,7 +47,7 @@ sub handler {
 	(join('&',$ENV{'QUERY_STRING'},$env{'request.querystring'},
 	      $ENV{'REDIRECT_QUERY_STRING'}),
 	 ['interface','username','domain','firsturl','localpath','localres',
-	  'token','role','symb','iptoken']);
+	  'token','role','symb','iptoken','btoken','ltoken','linkkey']);
     if (!defined($env{'form.firsturl'})) {
         &Apache::lonacc::get_posted_cgi($r,['firsturl']);
     }
@@ -56,6 +56,10 @@ sub handler {
             $env{'form.firsturl'} = $ENV{'REDIRECT_URL'};
         }
     }
+    if (($env{'form.firsturl'} =~ m{^/+tiny/+$LONCAPA::match_domain/+\w+$}) &&
+        (!$env{'form.ltoken'}) && (!$env{'form.linkkey'})) {
+        &Apache::lonacc::get_posted_cgi($r,['linkkey']);
+    }
 
 # -- check if they are a migrating user
     if (defined($env{'form.token'})) {
@@ -64,10 +68,10 @@ sub handler {
 
 # For "public user" - remove any exising "public" cookie, as user really wants to log-in
     my ($handle,$lonidsdir,$expirepub,$userdom);
+    $lonidsdir=$r->dir_config('lonIDsDir');
     unless ($r->header_only) {
         $handle = &Apache::lonnet::check_for_valid_session($r,'lonID',undef,\$userdom);
         if ($handle ne '') {
-            $lonidsdir=$r->dir_config('lonIDsDir');
             if ($handle=~/^publicuser\_/) {
                 unlink($r->dir_config('lonIDsDir')."/$handle.id");
                 undef($handle);
@@ -106,6 +110,69 @@ sub handler {
 	return OK;
     }
 
+    my $lonhost = $r->dir_config('lonHostID');
+    $env{'form.firsturl'} =~ s/(`)/'/g;
+
+# Check if browser sent a LON-CAPA load balancer cookie (and this is a balancer)
+
+    my ($found_server,$balancer_cookie) = &Apache::lonnet::check_for_balancer_cookie($r,1);
+    if ($found_server) {
+        my $hostname = &Apache::lonnet::hostname($found_server);
+        if ($hostname ne '') {
+            my $protocol = $Apache::lonnet::protocol{$found_server};
+            $protocol = 'http' if ($protocol ne 'https');
+            my $dest = '/adm/roles';
+            if ($env{'form.firsturl'} ne '') {
+                $dest = $env{'form.firsturl'};
+            }
+            my %info = (
+                         balcookie => $lonhost.':'.$balancer_cookie,
+                       );
+            if ($env{'form.ltoken'}) {
+                my %link_info = &Apache::lonnet::tmpget($env{'form.ltoken'});
+                if ($link_info{'linkprot'}) {
+                    $info{'linkprot'} = $link_info{'linkprot'};
+                }
+                &Apache::lonnet::tmpdel($env{'form.ltoken'});
+                delete($env{'form.ltoken'});
+            } elsif ($env{'form.linkkey'}) {
+                $info{'linkkey'} = $env{'form.linkkey'};
+                delete($env{'form.linkkey'});
+            }
+            my $balancer_token = &Apache::lonnet::tmpput(\%info,$found_server);
+            if ($balancer_token) {
+                $dest .=  (($dest=~/\?/)?'&;':'?') . 'btoken='.$balancer_token;
+            }
+            my $url = $protocol.'://'.$hostname.$dest;
+            my $start_page =
+                &Apache::loncommon::start_page('Switching Server ...',undef,
+                                               {'redirect'       => [0,$url],});
+            my $end_page   = &Apache::loncommon::end_page();
+            $r->print($start_page.$end_page);
+            return OK;
+        }
+    }
+
+#
+# Check if a LON-CAPA load balancer sent user here because user's browser sent
+# it a balancer cookie for an active session on this server.
+#
+
+    my ($balcookie,$linkprot,$linkkey);
+    if ($env{'form.btoken'}) {
+        my %info = &Apache::lonnet::tmpget($env{'form.btoken'});
+        $balcookie = $info{'balcookie'};
+        if ($balcookie) {
+            if ($info{'linkprot'}) {
+                $linkprot = $info{'linkprot'};
+            } elsif ($info{'linkkey'}) {
+                $linkkey = $info{'linkkey'};
+            }
+        }    
+        &Apache::lonnet::tmpdel($env{'form.btoken'});
+        delete($env{'form.btoken'});
+    }
+
 #
 # If browser sent an old cookie for which the session file had been removed
 # check if configuration for user's domain has a portal URL set.  If so
@@ -123,8 +190,6 @@ sub handler {
         }
     }
 
-    $env{'form.firsturl'} =~ s/(`)/'/g;
-
 # -------------------------------- Prevent users from attempting to login twice
     if ($handle ne '') {
         &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
@@ -134,7 +199,63 @@ sub handler {
 	    &Apache::loncommon::end_page();
         my $dest = '/adm/roles';
         if ($env{'form.firsturl'} ne '') {
-            $dest = $env{'form.firsturl'}; 
+            $dest = $env{'form.firsturl'};
+        }
+        if (($env{'form.ltoken'}) || ($linkprot)) {
+            unless ($linkprot) {
+                my %info = &Apache::lonnet::tmpget($env{'form.ltoken'});
+                $linkprot = $info{'linkprot'};
+                my $delete = &Apache::lonnet::tmpdel($env{'form.ltoken'});
+                delete($env{'form.ltoken'});
+            }
+            if ($linkprot) {
+                my ($linkprotector,$deeplink) = split(/:/,$linkprot,2);
+                if ($env{'user.linkprotector'}) {
+                    my @protectors = split(/,/,$env{'user.linkprotector'});
+                    unless (grep(/^\Q$linkprotector\E$/,@protectors)) {
+                        push(@protectors,$linkprotector);
+                        @protectors = sort { $a <=> $b } @protectors;
+                        &Apache::lonnet::appenv({'user.linkprotector' => join(',',@protectors)});
+                    }
+                } else {
+                    &Apache::lonnet::appenv({'user.linkprotector' => $linkprotector });
+                }
+                if ($env{'user.linkproturi'}) {
+                    my @proturis = split(/,/,$env{'user.linkproturi'});
+                    unless (grep(/^\Q$deeplink\E$/,@proturis)) {
+                        push(@proturis,$deeplink);
+                        @proturis = sort @proturis;
+                        &Apache::lonnet::appenv({'user.linkproturi' => join(',',@proturis)});
+                    }
+                } else {
+                    &Apache::lonnet::appenv({'user.linkproturi' => $deeplink});
+                }
+            }
+        } elsif (($env{'form.linkkey'}) || ($linkkey)) {
+            if ($env{'form.firsturl'} =~ m{^/tiny/$match_domain/\w+$}) {
+                if ($linkkey eq '') {
+                    $linkkey = $env{'form.linkkey'};
+                }
+                if ($env{'user.deeplinkkey'}) {
+                    my @linkkeys = split(/,/,$env{'user.deeplinkkey'});
+                    unless (grep(/^\Q$linkkey\E$/,@linkkeys)) {
+                        push(@linkkeys,$linkkey);
+                        &Apache::lonnet::appenv({'user.deeplinkkey' => join(',',sort(@linkkeys))});  
+                    }
+                } else {
+                    &Apache::lonnet::appenv({'user.deeplinkkey' => $linkkey});
+                }
+                my $deeplink = $env{'form.firsturl'}; 
+                if ($env{'user.keyedlinkuri'}) {
+                    my @keyeduris = split(/,/,$env{'user.keyedlinkuri'});
+                    unless (grep(/^\Q$deeplink\E$/,@keyeduris)) {
+                        push(@keyeduris,$deeplink);
+                        &Apache::lonnet::appenv({'user.keyedlinkuri' => join(',',sort(@keyeduris))});
+                    }
+                } else {
+                    &Apache::lonnet::appenv({'user.keyedlinkuri' => $deeplink});
+                }
+            }
         }
 	$r->print(
                   $start_page
@@ -172,12 +293,11 @@ sub handler {
     my $iconpath= 
 	&Apache::loncommon::lonhttpdurl($r->dir_config('lonIconsURL'));
 
-    my $lonhost = $r->dir_config('lonHostID');
     my $domain = &Apache::lonnet::default_login_domain();
     my $defdom = $domain;
     if ($lonhost ne '') {
         unless ($sessiondata{'sessionserver'}) {
-            my $redirect = &check_loginvia($domain,$lonhost);
+            my $redirect = &check_loginvia($domain,$lonhost,$lonidsdir,$balcookie,$linkprot);
             if ($redirect) {
                 $r->print($redirect);
                 return OK;
@@ -186,7 +306,7 @@ sub handler {
     }
 
     if (($sessiondata{'domain'}) &&
-        (&Apache::lonnet::domain($env{'form.domain'},'description'))) {
+        (&Apache::lonnet::domain($sessiondata{'domain'},'description'))) {
         $domain=$sessiondata{'domain'};
     } elsif (($env{'form.domain'}) && 
 	(&Apache::lonnet::domain($env{'form.domain'},'description'))) {
@@ -277,6 +397,22 @@ sub handler {
         }
         $tokenextras .= '&iptoken='.&escape($env{'form.iptoken'});
     }
+    if ($env{'form.ltoken'}) {
+        my %info = &Apache::lonnet::tmpget($env{'form.ltoken'});
+        &Apache::lonnet::tmpdel($env{'form.ltoken'});
+        delete($env{'form.ltoken'});
+        if ($info{'linkprot'}) {
+            if (!$tokenextras) {
+                $tokenextras = '&&&';
+            }
+            $tokenextras .= '&linkprot='.&escape($info{'linkprot'});
+        }
+    } elsif ($env{'form.linkkey'}) {
+        if (!$tokenextras) {
+            $tokenextras = '&&&';
+        }
+        $tokenextras .= '&linkkey='.&escape($env{'form.linkkey'});
+    }
     my $logtoken=Apache::lonnet::reply(
        'tmpput:'.$ukey.$lkey.'&'.$firsturl.$tokenextras,
        $lonhost);
@@ -685,8 +821,8 @@ ENDDOCUMENT
 }
 
 sub check_loginvia {
-    my ($domain,$lonhost) = @_;
-    if ($domain eq '' || $lonhost eq '') {
+    my ($domain,$lonhost,$lonidsdir,$balcookie,$linkprot) = @_;
+    if ($domain eq '' || $lonhost eq '' || $lonidsdir eq '') {
         return;
     }
     my %domconfhash = &Apache::loncommon::get_domainconf($domain);
@@ -715,7 +851,37 @@ sub check_loginvia {
             }
             if ($newhost ne $lonhost) {
                 if (&Apache::lonnet::hostname($newhost) ne '') {
-                    $output = &redirect_page($newhost,$path);
+                    if ($balcookie) {
+                        my ($balancer,$cookie) = split(/:/,$balcookie);
+                        if ($cookie =~ /^($match_domain)_($match_username)_([a-f0-9]+)$/) {
+                            my ($udom,$uname,$cookieid) = ($1,$2,$3);
+                            unless (&Apache::lonnet::delbalcookie($cookie,$balancer) eq 'ok') {
+                                if ((-d $lonidsdir) && (opendir(my $dh,$lonidsdir))) {
+                                    while (my $filename=readdir($dh)) {
+                                        if ($filename=~/^(\Q$uname\E_\d+_\Q$udom\E_$match_lonid)\.id$/) {
+                                            my $handle = $1;
+                                            my %hash =
+                                                &Apache::lonnet::get_sessionfile_vars($handle,$lonidsdir,
+                                                                                     ['request.balancercookie',
+                                                                                      'user.linkedenv']);
+                                            if ($hash{'request.balancercookie'} eq "$balancer:$cookieid") {
+                                                if (unlink("$lonidsdir/$filename")) {
+                                                    if (($hash{'user.linkedenv'} =~ /^[a-f0-9]+_linked$/) &&
+                                                        (-l "$lonidsdir/$hash{'user.linkedenv'}.id") &&
+                                                        (readlink("$lonidsdir/$hash{'user.linkedenv'}.id") eq "$lonidsdir/$filename")) {
+                                                        unlink("$lonidsdir/$hash{'user.linkedenv'}.id");
+                                                    }
+                                                }
+                                            }
+                                            last;
+                                        }
+                                    }
+                                    closedir($dh);
+                                }
+                            }
+                        }
+                    }
+                    $output = &redirect_page($newhost,$path,$linkprot);
                 }
             }
         }
@@ -724,16 +890,23 @@ sub check_loginvia {
 }
 
 sub redirect_page {
-    my ($desthost,$path) = @_;
+    my ($desthost,$path,$linkprot) = @_;
+    my $hostname = &Apache::lonnet::hostname($desthost);
     my $protocol = $Apache::lonnet::protocol{$desthost};
     $protocol = 'http' if ($protocol ne 'https');
     unless ($path =~ m{^/}) {
         $path = '/'.$path;
     }
-    my $url = $protocol.'://'.&Apache::lonnet::hostname($desthost).$path;
+    my $url = $protocol.'://'.$hostname.$path;
     if ($env{'form.firsturl'} ne '') {
         $url .='?firsturl='.$env{'form.firsturl'};
     }
+    if ($linkprot) {
+        my $ltoken = &Apache::lonnet::tmpput({linkprot => $linkprot},$desthost);
+        if ($ltoken) {
+            $url .= (($url =~ /\?/) ? '&' : '?').'ltoken='.$ltoken;
+        }
+    }
     my $start_page = &Apache::loncommon::start_page('Switching Server ...',undef,
                                                     {'redirect' => [0,$url],});
     my $end_page   = &Apache::loncommon::end_page();