--- loncom/homework/lonhomework.pm	2023/07/05 16:58:52	1.344.2.10.4.2
+++ loncom/homework/lonhomework.pm	2023/09/07 16:35:29	1.344.2.10.4.3
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # The LON-CAPA Homework handler
 #
-# $Id: lonhomework.pm,v 1.344.2.10.4.2 2023/07/05 16:58:52 raeburn Exp $
+# $Id: lonhomework.pm,v 1.344.2.10.4.3 2023/09/07 16:35:29 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -49,6 +49,8 @@ use Apache::matchresponse();
 use Apache::chemresponse();
 use Apache::functionplotresponse();
 use Apache::drawimage();
+use Apache::loncourseuser();
+use Apache::grades();
 use Apache::Constants qw(:common);
 use Apache::loncommon();
 use Apache::lonparmset();
@@ -721,6 +723,9 @@ sub setuppermissions {
 	$env{'request.course.sec'} !~ /^\s*$/) {
 	$viewgrades = &Apache::lonnet::allowed('vgr',$env{'request.course.id'}.
                                                '/'.$env{'request.course.sec'});
+        if ($viewgrades) {
+            $Apache::lonhomework::viewgradessec = $env{'request.course.sec'};
+        }
     }
     $Apache::lonhomework::viewgrades = $viewgrades;
 
@@ -738,6 +743,9 @@ sub setuppermissions {
 	$modifygrades = 
 	    &Apache::lonnet::allowed('mgr',$env{'request.course.id'}.
 				     '/'.$env{'request.course.sec'});
+        if ($modifygrades) {
+            $Apache::lonhomework::modifygradessec = $env{'request.course.sec'};
+        }
     }
     $Apache::lonhomework::modifygrades = $modifygrades;
 
@@ -756,7 +764,9 @@ sub setuppermissions {
 sub unset_permissions {
     undef($Apache::lonhomework::queuegrade);
     undef($Apache::lonhomework::modifygrades);
+    undef($Apache::lonhomework::modifygradessec);
     undef($Apache::lonhomework::viewgrades);
+    undef($Apache::lonhomework::viewgradessec);
     undef($Apache::lonhomework::browse);
 }
 
@@ -1204,7 +1214,7 @@ sub editxmlmode {
 #    Render the page in whatever target desired.
 #
 sub renderpage {
-    my ($request,$file,$targets,$return_string,$donebuttonmsg) = @_;
+    my ($request,$file,$targets,$return_string,$donebuttonmsg,$viewasuser,$symb) = @_;
 
     my @targets = @{$targets || [&get_target()]};
     &Apache::lonhomework::showhashsubset(\%env,'form.');
@@ -1243,6 +1253,10 @@ sub renderpage {
 	if ($target eq 'answer') { &showhash(%Apache::lonhomework::history); }
 	if ($target eq 'web') {&Apache::lonhomework::showhashsubset(\%env,'^form');}
 
+        if (($target eq 'web') && ($viewasuser ne '') && ($symb ne '')) {
+            $env{'request.user_in_effect'} = $viewasuser;
+        }
+
 	&Apache::lonxml::debug("Should be parsing now");
 	$result .= &Apache::lonxml::xmlparse($request, $target, $problem,
 					     &setup_vars($target),%mystyle);
@@ -1268,15 +1282,23 @@ sub renderpage {
 	    #}
 #	    $request->print($result);
 	    $overall_result.=$result;
+            if (($target eq 'web') && ($viewasuser ne '') && ($symb ne '')) {
+                my ($vuname,$vudom) = split(/:/,$viewasuser);
+                $overall_result .= &Apache::grades::view_as_user($symb,$vuname,$vudom).
+                                   '</body></html>';
+            }
 #	    $request->rflush();
 	}
+        if (($target eq 'web') && ($viewasuser ne '') && ($symb ne '')) {
+            undef($env{'request.user_in_effect'});
+        }
 	#$request->print(":Result ends");
 	#my $td=&tv_interval($t0);
     }
     if (!$return_string) {
 	&Apache::lonxml::add_messages(\$overall_result);
-	$request->print($overall_result);   
-	$request->rflush();   
+	$request->print($overall_result);
+	$request->rflush();
     } else {
 	return $overall_result;
     }
@@ -1597,16 +1619,40 @@ sub handler {
     } else {
         # Set the event timer to zero if the "done button" was clicked.  The button is
         # part of the doneButton form created in lonmenu.pm
-        my ($donebuttonresult,$donemsg);
+        my ($donebuttonresult,$donemsg,$viewasuser);
         if ($symb && $env{'form.LC_interval_done'} eq 'true') {
             ($donebuttonresult,$donemsg) = &zero_timer($symb);
             undef($env{'form.LC_interval_done'});
             undef($env{'form.LC_interval_done_proctorpass'});
         }
+        if (($env{'form.LC_viewas'} ne '') && $symb && $env{'request.course.id'} &&
+            ($Apache::lonhomework::viewgrades || $Apache::lonhomework::modifygrades)) {
+            if ($env{'form.LC_viewas'} =~ /^($match_username):($match_domain)$/) {
+                my ($possuname,$possudom) = ($1,$2);
+                my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
+                my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
+                my ($canview,$posssec);
+                if ($env{'request.course.sec'} ne '') {
+                    if ($Apache::lonhomework::modifygradessec eq $env{'request.course.sec'}) {
+                        $canview = 'section';
+                        $posssec = $env{'request.course.sec'};
+                    } elsif ($Apache::lonhomework::viewgradessec eq $env{'request.course.sec'}) {
+                        $canview = 'section';
+                        $posssec = $env{'request.course.sec'};
+                    }
+                }
+                my $crstype = &Apache::loncommon::course_type();
+                if (&Apache::loncourseuser::is_course_user($possudom,$possuname,$cdom,$cnum,
+                                                           $canview,$crstype,$posssec)) {
+                    $viewasuser = $possuname.':'.$possudom;
+                }
+            }
+            undef($env{'form.LC_viewas'});
+        }
 	# just render the page normally outside of construction space
 	&Apache::lonxml::debug("not construct");
         undef(@Apache::lonhomework::ltipassback);
-	&renderpage($request,$file,undef,undef,$donemsg);
+	&renderpage($request,$file,undef,undef,$donemsg,$viewasuser,$symb);
         if (@Apache::lonhomework::ltipassback) {
             unless ($registered_cleanup) {
                 my $handlers = $request->get_handlers('PerlCleanupHandler');