--- loncom/lonnet/perl/lonnet.pm	2006/10/04 21:02:41	1.789
+++ loncom/lonnet/perl/lonnet.pm	2006/10/12 16:35:02	1.790
@@ -1,7 +1,7 @@
 # The LearningOnline Network
 # TCP networking package
 #
-# $Id: lonnet.pm,v 1.789 2006/10/04 21:02:41 albertel Exp $
+# $Id: lonnet.pm,v 1.790 2006/10/12 16:35:02 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -52,6 +52,7 @@ use Storable qw(lock_store lock_nstore l
 use Time::HiRes qw( gettimeofday tv_interval );
 use Cache::Memcached;
 use Digest::MD5;
+use Math::Random;
 use lib '/home/httpd/lib/perl';
 use LONCAPA;
 use LONCAPA::Configuration;
@@ -412,6 +413,31 @@ sub delenv {
     return 'ok';
 }
 
+=pod
+
+=item * get_env_multiple($name) 
+
+gets $name from the %env hash, it seemlessly handles the cases where multiple
+values may be defined and end up as an array ref.
+
+returns an array of values
+
+=cut
+
+sub get_env_multiple {
+    my ($name) = @_;
+    my @values;
+    if (defined($env{$name})) {
+        # exists is it an array
+        if (ref($env{$name})) {
+            @values=@{ $env{$name} };
+        } else {
+            $values[0]=$env{$name};
+        }
+    }
+    return(@values);
+}
+
 # ------------------------------------------ Find out current server userload
 # there is a copy in lond
 sub userload {
@@ -2035,7 +2061,7 @@ sub get_domain_roles {
 
 sub get_first_access {
     my ($type,$argsymb)=@_;
-    my ($symb,$courseid,$udom,$uname)=&Apache::lonxml::whichuser();
+    my ($symb,$courseid,$udom,$uname)=&whichuser();
     if ($argsymb) { $symb=$argsymb; }
     my ($map,$id,$res)=&decode_symb($symb);
     if ($type eq 'map') {
@@ -2049,7 +2075,7 @@ sub get_first_access {
 
 sub set_first_access {
     my ($type)=@_;
-    my ($symb,$courseid,$udom,$uname)=&Apache::lonxml::whichuser();
+    my ($symb,$courseid,$udom,$uname)=&whichuser();
     my ($map,$id,$res)=&decode_symb($symb);
     if ($type eq 'map') {
 	$res=&symbread($map);
@@ -5510,8 +5536,7 @@ sub EXT {
 	$symbparm=&get_symb_from_alias($symbparm);
     }
     if (!($uname && $udom)) {
-      (my $cursymb,$courseid,$udom,$uname,$publicuser)=
-	  &Apache::lonxml::whichuser($symbparm);
+      (my $cursymb,$courseid,$udom,$uname,$publicuser)= &whichuser($symbparm);
       if (!$symbparm) {	$symbparm=$cursymb; }
     } else {
 	$courseid=$env{'request.course.id'};
@@ -6165,7 +6190,7 @@ sub gettitle {
 sub get_slot {
     my ($which,$cnum,$cdom)=@_;
     if (!$cnum || !$cdom) {
-	(undef,my $courseid)=&Apache::lonxml::whichuser();
+	(undef,my $courseid)=&whichuser();
 	$cdom=$env{'course.'.$courseid.'.domain'};
 	$cnum=$env{'course.'.$courseid.'.num'};
     }
@@ -6496,7 +6521,7 @@ sub latest_rnd_algorithm_id {
 
 sub get_rand_alg {
     my ($courseid)=@_;
-    if (!$courseid) { $courseid=(&Apache::lonxml::whichuser())[1]; }
+    if (!$courseid) { $courseid=(&whichuser())[1]; }
     if ($courseid) {
 	return $env{"course.$courseid.rndseed"};
     }
@@ -6522,7 +6547,7 @@ sub getCODE {
 sub rndseed {
     my ($symb,$courseid,$domain,$username)=@_;
 
-    my ($wsymb,$wcourseid,$wdomain,$wusername)=&Apache::lonxml::whichuser();
+    my ($wsymb,$wcourseid,$wdomain,$wusername)=&whichuser();
     if (!$symb) {
 	unless ($symb=$wsymb) { return time; }
     }
@@ -6563,8 +6588,8 @@ sub rndseed_32bit {
 	my $domainseed=unpack("%32C*",$domain) << 7;
 	my $courseseed=unpack("%32C*",$courseid);
 	my $num=$symbseed+$nameseed+$domainseed+$courseseed+$namechck+$symbchck;
-	#&Apache::lonxml::debug("$symbseed:$nameseed;$domainseed|$courseseed;$namechck:$symbchck");
-	#&Apache::lonxml::debug("rndseed :$num:$symb");
+	#&logthis("$symbseed:$nameseed;$domainseed|$courseseed;$namechck:$symbchck");
+	#&logthis("rndseed :$num:$symb");
 	if ($_64bit) { $num=(($num<<32)>>32); }
 	return $num;
     }
@@ -6584,8 +6609,8 @@ sub rndseed_64bit {
 	
 	my $num1=$symbchck+$symbseed+$namechck;
 	my $num2=$nameseed+$domainseed+$courseseed;
-	#&Apache::lonxml::debug("$symbseed:$nameseed;$domainseed|$courseseed;$namechck:$symbchck");
-	#&Apache::lonxml::debug("rndseed :$num:$symb");
+	#&logthis("$symbseed:$nameseed;$domainseed|$courseseed;$namechck:$symbchck");
+	#&logthis("rndseed :$num:$symb");
 	if ($_64bit) { $num1=(($num1<<32)>>32); $num2=(($num2<<32)>>32); }
 	if ($_64bit) { $num1=(($num1<<32)>>32); $num2=(($num2<<32)>>32); }
 	return "$num1,$num2";
@@ -6608,8 +6633,8 @@ sub rndseed_64bit2 {
 	
 	my $num1=$symbchck+$symbseed+$namechck;
 	my $num2=$nameseed+$domainseed+$courseseed;
-	#&Apache::lonxml::debug("$symbseed:$nameseed;$domainseed|$courseseed;$namechck:$symbchck");
-	#&Apache::lonxml::debug("rndseed :$num:$symb");
+	#&logthis("$symbseed:$nameseed;$domainseed|$courseseed;$namechck:$symbchck");
+	#&logthis("rndseed :$num:$symb");
 	return "$num1,$num2";
     }
 }
@@ -6630,8 +6655,8 @@ sub rndseed_64bit3 {
 	
 	my $num1=$symbchck+$symbseed+$namechck;
 	my $num2=$nameseed+$domainseed+$courseseed;
-	#&Apache::lonxml::debug("$symbseed:$nameseed;$domainseed|$courseseed;$namechck:$symbchck");
-	#&Apache::lonxml::debug("rndseed :$num1:$num2:$_64bit");
+	#&logthis("$symbseed:$nameseed;$domainseed|$courseseed;$namechck:$symbchck");
+	#&logthis("rndseed :$num1:$num2:$_64bit");
 	if ($_64bit) { $num1=(($num1<<32)>>32); $num2=(($num2<<32)>>32); }
 	
 	return "$num1:$num2";
@@ -6654,8 +6679,8 @@ sub rndseed_64bit4 {
 	
 	my $num1=$symbchck+$symbseed+$namechck;
 	my $num2=$nameseed+$domainseed+$courseseed;
-	#&Apache::lonxml::debug("$symbseed:$nameseed;$domainseed|$courseseed;$namechck:$symbchck");
-	#&Apache::lonxml::debug("rndseed :$num1:$num2:$_64bit");
+	#&logthis("$symbseed:$nameseed;$domainseed|$courseseed;$namechck:$symbchck");
+	#&logthis("rndseed :$num1:$num2:$_64bit");
 	if ($_64bit) { $num1=(($num1<<32)>>32); $num2=(($num2<<32)>>32); }
 	
 	return "$num1:$num2";
@@ -6679,8 +6704,8 @@ sub rndseed_CODE_64bit {
 	my $courseseed=unpack("%32S*",$courseid.' ');
 	my $num1=$symbseed+$CODEchck;
 	my $num2=$CODEseed+$courseseed+$symbchck;
-	#&Apache::lonxml::debug("$symbseed:$CODEchck|$CODEseed:$courseseed:$symbchck");
-	#&Apache::lonxml::debug("rndseed :$num1:$num2:$symb");
+	#&logthis("$symbseed:$CODEchck|$CODEseed:$courseseed:$symbchck");
+	#&logthis("rndseed :$num1:$num2:$symb");
 	if ($_64bit) { $num1=(($num1<<32)>>32); }
 	if ($_64bit) { $num2=(($num2<<32)>>32); }
 	return "$num1:$num2";
@@ -6698,8 +6723,8 @@ sub rndseed_CODE_64bit4 {
 	my $courseseed=unpack("%32S*",$courseid.' ');
 	my $num1=$symbseed+$CODEchck;
 	my $num2=$CODEseed+$courseseed+$symbchck;
-	#&Apache::lonxml::debug("$symbseed:$CODEchck|$CODEseed:$courseseed:$symbchck");
-	#&Apache::lonxml::debug("rndseed :$num1:$num2:$symb");
+	#&logthis("$symbseed:$CODEchck|$CODEseed:$courseseed:$symbchck");
+	#&logthis("rndseed :$num1:$num2:$symb");
 	if ($_64bit) { $num1=(($num1<<32)>>32); }
 	if ($_64bit) { $num2=(($num2<<32)>>32); }
 	return "$num1:$num2";
@@ -6760,8 +6785,7 @@ sub ireceipt {
     my $return =&recprefix($fucourseid).'-';
     if ($env{"course.$fucourseid.receiptalg"} eq 'receipt2' ||
 	$env{'request.state'} eq 'construct') {
-	&Apache::lonxml::debug("doing receipt2  using parts $cpart, uname $cuname and udom $cudom gets  ".($cpart%$cuname).
-			       " and ".($cpart%$cudom));
+	#&logthis("doing receipt2  using parts $cpart, uname $cuname and udom $cudom gets  ".($cpart%$cuname)." and ".($cpart%$cudom));
 			       
 	$return.= ($cunique%$cuname+
 		   $cunique%$cudom+
@@ -6784,10 +6808,48 @@ sub ireceipt {
 
 sub receipt {
     my ($part)=@_;
-    my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
+    my ($symb,$courseid,$domain,$name) = &whichuser();
     return &ireceipt($name,$domain,$courseid,$symb,$part);
 }
 
+sub whichuser {
+    my ($passedsymb)=@_;
+    my ($symb,$courseid,$domain,$name,$publicuser);
+    if (defined($env{'form.grade_symb'})) {
+	my ($tmp_courseid)=&get_env_multiple('form.grade_courseid');
+	my $allowed=&allowed('vgr',$tmp_courseid);
+	if (!$allowed &&
+	    exists($env{'request.course.sec'}) &&
+	    $env{'request.course.sec'} !~ /^\s*$/) {
+	    $allowed=&allowed('vgr',$tmp_courseid.
+			      '/'.$env{'request.course.sec'});
+	}
+	if ($allowed) {
+	    ($symb)=&get_env_multiple('form.grade_symb');
+	    $courseid=$tmp_courseid;
+	    ($domain)=&get_env_multiple('form.grade_domain');
+	    ($name)=&get_env_multiple('form.grade_username');
+	    return ($symb,$courseid,$domain,$name,$publicuser);
+	}
+    }
+    if (!$passedsymb) {
+	$symb=&symbread();
+    } else {
+	$symb=$passedsymb;
+    }
+    $courseid=$env{'request.course.id'};
+    $domain=$env{'user.domain'};
+    $name=$env{'user.name'};
+    if ($name eq 'public' && $domain eq 'public') {
+	if (!defined($env{'form.username'})) {
+	    $env{'form.username'}.=time.rand(10000000);
+	}
+	$name.=$env{'form.username'};
+    }
+    return ($symb,$courseid,$domain,$name,$publicuser);
+
+}
+
 # ------------------------------------------------------------ Serves up a file
 # returns either the contents of the file or 
 # -1 if the file doesn't exist