--- loncom/homework/grades.pm	2001/02/07 00:29:30	1.1
+++ loncom/homework/grades.pm	2002/05/16 00:01:09	1.25
@@ -1,16 +1,420 @@
+# The LearningOnline Network with CAPA
 # The LON-CAPA Grading handler
-# Guy Albertelli
-# 11/30 Gerd Kortemeyer
-# 6/1 Gerd Kortemeyer
+#
+# $Id: grades.pm,v 1.25 2002/05/16 00:01:09 albertel Exp $
+#
+# Copyright Michigan State University Board of Trustees
+#
+# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
+#
+# LON-CAPA is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# LON-CAPA is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with LON-CAPA; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+#
+# /home/httpd/html/adm/gpl.txt
+#
+# http://www.lon-capa.org/
+#
+# 2/9,2/13 Guy Albertelli
+# 6/8 Gerd Kortemeyer
+# 7/26 H.K. Ng
+# 8/20 Gerd Kortemeyer
 
 package Apache::grades;
 use strict;
 use Apache::style;
 use Apache::lonxml;
 use Apache::lonnet;
+use Apache::loncommon;
 use Apache::lonhomework;
 use Apache::Constants qw(:common);
 
+sub moreinfo {
+  my ($request,$reason) = @_;
+  $request->print("Unable to process request: $reason");
+  if ( $Apache::grades::viewgrades eq 'F' ) {
+    $request->print('<form action="/adm/grades" method="post">'."\n");
+    if ($ENV{'form.url'}) {
+      $request->print('<input type="hidden" name="url" value="'.$ENV{'form.url'}.'" />'."\n");
+    }
+    if ($ENV{'form.symb'}) {
+      $request->print('<input type="hidden" name="symb" value="'.$ENV{'form.symb'}.'" />'."\n");
+    }
+    $request->print('<input type="hidden" name="command" value="'.$ENV{'form.command'}.'" />'."\n");
+    $request->print("Student:".'<input type="text" name="student" value="'.$ENV{'form.student'}.'" />'."<br />\n");
+    $request->print("Domain:".'<input type="text" name="domain" value="'.$ENV{'user.domain'}.'" />'."<br />\n");
+    $request->print('<input type="submit" name="submit" value="ReSubmit" />'."<br />\n");
+    $request->print('</form>');
+  }
+  return '';
+}
+
+sub verifyreceipt {
+    my $request=shift;
+    my $courseid=$ENV{'request.course.id'};
+    my $cdom=$ENV{"course.$courseid.domain"};
+    my $cnum=$ENV{"course.$courseid.num"};
+    my $receipt=unpack("%32C*",$Apache::lonnet::perlvar{'lonHostID'}).'-'.
+                $ENV{'form.receipt'};
+    $receipt=~s/[^\-\d]//g;
+    my $symb=$ENV{'form.symb'};
+    unless ($symb) {
+	$symb=&Apache::lonnet::symbread($ENV{'form.url'});
+    }
+    if ((&Apache::lonnet::allowed('mgr',$courseid)) && ($symb)) {
+        $request->print('<h1>Verifying Submission Receipt '.$receipt.'</h1>');
+        my $matches=0;
+        my (%classlist) = &getclasslist($cdom,$cnum,'0');
+        foreach my $student ( sort(@{ $classlist{'allids'} }) ) {
+            my ($uname,$udom)=split(/\:/,$student);
+            if ($receipt eq 
+             &Apache::lonnet::ireceipt($uname,$udom,$courseid,$symb)) {
+               $request->print('Matching '.$student.'<br>');
+               $matches++;
+	   }
+        }
+        $request->print('<p>'.$matches.' match(es)</p>');
+    }
+    return '';
+}
+
+sub listStudents {
+  my ($request) = shift;
+  my $cdom=$ENV{"course.$ENV{'request.course.id'}.domain"};
+  my $cnum=$ENV{"course.$ENV{'request.course.id'}.num"};
+  my $hostver=unpack("%32C*",$Apache::lonnet::perlvar{'lonHostID'});
+  $request->print(<<ENDHEADER);
+<h1>Verify a Submission Receipt Issued by this Server</h1>
+<form action="/adm/grades" method="post">
+<tt>$hostver-<input type="text" name="receipt" size="4"></tt>
+<input type="submit" name="submit" value="Verify">
+<input type="hidden" name="command" value="verify">
+ENDHEADER
+	  if ($ENV{'form.url'}) {
+	    $request->print(
+    '<input type="hidden" name="url" value="'.$ENV{'form.url'}.'" />');
+	  }
+	  if ($ENV{'form.symb'}) {
+	    $request->print(
+    '<input type="hidden" name="symb" value="'.$ENV{'form.symb'}.'" />');
+	  }
+  $request->print(<<ENDTABLEST);
+</form>
+<h1>Show Student Submissions on Assessment</h1>
+<table border="1">
+<tr><th>Username</th><th>Domain</th><th>Name</th><th>&nbsp;</th></tr>
+ENDTABLEST
+  my (%classlist) = &getclasslist($cdom,$cnum,'0');
+  foreach my $student ( sort(@{ $classlist{'allids'} }) ) {
+      my ($sname,$sdom) = split(/:/,$student);
+
+      my %name=&Apache::lonnet::get('environment', ['lastname','generation',
+						    'firstname','middlename'],
+				    $sdom,$sname);
+      my $fullname;
+      my ($tmp) = keys(%name);
+      if ($tmp !~ /^(con_lost|error|no_such_host)/i) {
+	$fullname=$name{'lastname'}.$name{'generation'};
+	if ($fullname =~ /[^\s]+/) { $fullname.=','; }
+	$fullname.=$name{'firstname'}.' '.$name{'middlename'};
+      }
+      if ( $Apache::grades::viewgrades eq 'F' ) {
+	  $request->print("\n".'<tr>'."<td>$sname</td><td>$sdom</td><td>$fullname</td><td>".
+			  '<form action="/adm/grades" method="post">');
+	  if ($ENV{'form.url'}) {
+	    $request->print(
+    '<input type="hidden" name="url" value="'.$ENV{'form.url'}.'" />');
+	  }
+	  if ($ENV{'form.symb'}) {
+	    $request->print(
+    '<input type="hidden" name="symb" value="'.$ENV{'form.symb'}.'" />');
+	  }
+	  $request->print(
+    '<input type="hidden" name="command" value="'.$ENV{'form.command'}.'" />');
+	  $request->print(
+             '<input type="hidden" name="student" value="'.$sname.'" />');
+	  $request->print(
+             '<input type="hidden" name="domain" value="'.$sdom.'" />');
+	  $request->print(
+                         '<input type="submit" name="submit" value="View" />');
+	  $request->print('</form></td></tr>');
+      }
+  }
+  $request->print('</table>');
+}
+
+
+#FIXME - needs to handle multiple matches
+sub finduser {
+  my ($name) = @_;
+  my $domain = '';
+
+  if ( $Apache::grades::viewgrades eq 'F' ) {
+    #get classlist
+    my ($cdom,$cnum) = split(/_/,$ENV{'request.course.id'});
+    #print "Found $cdom:$cnum<br />";
+    my (%classlist) = &getclasslist($cdom,$cnum,'0');
+    foreach my $student ( sort(@{ $classlist{'allids'} }) ) {
+      my ($posname,$posdomain) = split(/:/,$student);
+      if ($posname =~ $name) { $name=$posname; $domain=$posdomain; last; }
+    }
+    return ($name,$domain);
+  } else {
+    return ($ENV{'user.name'},$ENV{'user.domain'});
+  }
+}
+
+sub getclasslist {
+  my ($coursedomain,$coursenum,$hideexpired) = @_;
+  my %classlist=&Apache::lonnet::dump('classlist',$coursedomain,$coursenum);
+  my $now = time;
+  foreach my $student (keys(%classlist)) {
+    my ($end,$start)=split(/:/,$classlist{$student});
+    # still a student?
+    if (($hideexpired) && ($end) && ($end < $now)) {
+      #print "Skipping:$name:$end:$now<br />\n";
+      next;
+    }
+    #print "record=$record<br>";
+    push( @{ $classlist{'allids'} }, $student);
+  }
+  return (%classlist);
+}
+
+sub getpartlist {
+  my ($url) = @_;
+  my @parts =();
+  my (@metakeys) = split(/,/,&Apache::lonnet::metadata($url,'keys'));
+  foreach my $key (@metakeys) {
+    if ( $key =~ m/stores_([0-9]+)_.*/ ) {
+      push(@parts,$key);
+    }
+  }
+  return @parts;
+}
+
+sub viewstudentgrade {
+  my ($url,$symb,$courseid,$student,@parts) = @_;
+  my $result ='';
+  my $cellclr = '"#ffffdd"';
+  my ($stuname,$domain) = split(/:/,$student);
+
+  my %record=&Apache::lonnet::restore($symb,$courseid,$domain,$stuname);
+
+  $result.="<tr><td bgcolor=$cellclr>$stuname</td><td bgcolor=$cellclr align=\"middle\">$domain</td>\n";
+  foreach my $part (@parts) {
+    my ($temp,$part,$type)=split(/_/,$part);
+    #print "resource.$part.$type = ".$record{"resource.$part.$type"}." <br />\n";
+    if ($type eq 'awarded') {
+      my $score=$record{"resource.$part.$type"};
+      $result.="<td bgcolor=$cellclr align=\"middle\"><input type=\"text\" name=\"GRADE.$student.$part.$type\" value=\"$score\" size=\"4\" /></td>\n";
+    } elsif ($type eq 'tries') {
+      my $score=$record{"resource.$part.$type"};
+      $result.="<td bgcolor=$cellclr align=\"middle\"><input type=\"text\" name=\"GRADE.$student.$part.$type\" value=\"$score\" size=\"4\" /></td>\n"
+    } elsif ($type eq 'solved') {
+      my $score=$record{"resource.$part.$type"};
+      $result.="<td bgcolor=$cellclr align=\"middle\"><select name=\"GRADE.$student.$part.$type\">\n";
+      if ($score =~ /^correct/) {
+	$result.="<option selected=\"on\">correct</option>\n<option>incorrect</option>\n<option>excused</option>\n<option>ungraded</option>\n<option>nothing</option>\n";
+      } elsif ($score =~ /^incorrect/) {
+	$result.="<option>correct</option>\n<option selected=\"on\">incorrect</option>\n<option>excused</option>\n<option>ungraded</option>\n<option>nothing</option>\n";
+      } elsif ($score eq '') {
+	$result.="<option>correct</option>\n<option>incorrect</option>\n<option>excused</option>\n<option>ungraded</option>\n<option selected=\"on\">nothing</option>\n";
+      } elsif ($score =~ /^excused/) {
+	$result.="<option>correct</option>\n<option>incorrect</option>\n<option selected=\"on\">excused</option>\n<option>ungraded</option>\n<option>nothing</option>\n";
+      } elsif ($score =~ /^ungraded/) {
+	$result.="<option>correct</option>\n<option>incorrect</option>\n<option>excused</option>\n<option selected=\"on\">ungraded</option>\n<option>nothing</option>\n";
+      }
+      $result.="</select></td>\n";
+    }
+  }
+  $result.='</tr>';
+  return $result;
+}
+#FIXME need to look at the meatdata <stores> spec on what type of data to accept and provide an
+#interface based on that, also do that to above function.
+sub setstudentgrade {
+  my ($url,$symb,$courseid,$student,@parts) = @_;
+
+  my $result ='';
+
+  my ($stuname,$domain) = split(/:/,$student);
+
+  my %record=&Apache::lonnet::restore($symb,$courseid,$domain,$stuname);
+
+  my %newrecord;
+
+  foreach my $part (@parts) {
+    my ($temp,$part,$type)=split(/_/,$part);
+    my $oldscore=$record{"resource.$part.$type"};
+    my $newscore=$ENV{"form.GRADE.$student.$part.$type"};
+    if ($type eq 'solved') {
+      my $update=0;
+      if ($newscore eq 'nothing' ) {
+	if ($oldscore ne '') {
+	  $update=1;
+	  $newscore = '';
+	}
+      } elsif ($oldscore !~ m/^$newscore/) {
+	$update=1;
+	$result.="Updating $stuname to $newscore<br />\n";
+	if ($newscore eq 'correct') { $newscore = 'correct_by_override'; }
+	if ($newscore eq 'incorrect') { $newscore = 'incorrect_by_override'; }
+	if ($newscore eq 'excused') { $newscore = 'excused'; }
+	if ($newscore eq 'ungraded') { $newscore = 'ungraded_attempted'; }
+      } else {
+	#$result.="$stuname:$part:$type:unchanged  $oldscore to $newscore:<br />\n";
+      }
+      if ($update) { $newrecord{"resource.$part.$type"}=$newscore; }
+    } else {
+      if ($oldscore ne $newscore) {
+	$newrecord{"resource.$part.$type"}=$newscore;
+	$result.="Updating $student"."'s status for $part.$type to $newscore<br />\n";
+      } else {
+	#$result.="$stuname:$part:$type:unchanged  $oldscore to $newscore:<br />\n";
+      }
+    }
+  }
+  if ( scalar(keys(%newrecord)) > 0 ) {
+    $newrecord{"resource.regrader"}="$ENV{'user.name'}:$ENV{'user.domain'}";
+    &Apache::lonnet::cstore(\%newrecord,$symb,$courseid,$domain,$stuname);
+
+    $result.="Stored away ".scalar(keys(%newrecord))." elements.<br />\n";
+  }
+  return $result;
+}
+
+sub submission {
+  my ($request) = @_;
+  my $url=$ENV{'form.url'};
+  $url=~s-^http://($ENV{'SERVER_NAME'}|$ENV{'HTTP_HOST'})--;
+  if ($ENV{'form.student'} eq '') { &moreinfo($request,"Need student login id"); return ''; }
+#  if ($ENV{'form.student'} eq '') { &listStudents($request); return ''; }
+  my ($uname,$udom) = &finduser($ENV{'form.student'});
+  if ($uname eq '') { &moreinfo($request,"Unable to find student"); return ''; }
+  my $symb;
+  if ($ENV{'form.symb'}) {
+    $symb=$ENV{'form.symb'};
+  } else {
+    $symb=&Apache::lonnet::symbread($url);
+  }
+  if ($symb eq '') { $request->print("Unable to handle ambiguous references:$url:."); return ''; }
+  my $answer=&Apache::loncommon::get_previous_attempt($symb,$uname,$udom,
+						      $ENV{'request.course.id'});
+  my $result="<h2> Submission Record </h2>  $uname:$udom for $url <br />".$answer;
+  my $rendered=&Apache::loncommon::get_student_view($symb,$uname,$udom,
+						   $ENV{'request.course.id'});
+  $result.="Student's view of the problem:<br /> $rendered <br /> Correct answer:<br />";
+
+  $answer=&Apache::loncommon::get_student_answers($symb,$uname,$udom,
+						  $ENV{'request.course.id'});
+  $result.=$answer;
+  return $result;
+}
+
+sub viewgrades {
+  my ($request) = @_;
+  my $result='';
+
+  #get resource reference
+  my $url=$ENV{'form.url'};
+  $url=~s-^http://($ENV{'SERVER_NAME'}|$ENV{'HTTP_HOST'})--;
+  my $symb=$ENV{'form.symb'};
+  if (!$symb) { $symb=&Apache::lonnet::symbread($url); }
+  if ($symb eq '') { $request->print("Unable to handle ambiguous references:$url:."); return ''; }
+
+  #get classlist
+  my ($cdom,$cnum) = split(/_/,$ENV{'request.course.id'});
+  #print "Found $cdom:$cnum<br />";
+  my (%classlist) = &getclasslist($cdom,$cnum,'0');
+  my $headerclr = '"#ccffff"';
+  my $cellclr = '"#ffffcc"';
+
+  #get list of parts for this problem
+  my (@parts) = &getpartlist($url);
+
+  $request->print ("<h2><font color=\"#339966\">Manual Grading</font></h2>");
+
+  #start the form
+  $result = '<form action="/adm/grades" method="post">'."\n".
+    '<input type="hidden" name="symb" value="'.$symb.'" />'."\n".
+      '<input type="hidden" name="url" value="'.$url.'" />'."\n".
+	'<input type="hidden" name="command" value="editgrades" />'."\n".
+	  '<input type="submit" name="submit" value="Submit Changes" />'."\n".
+	    '<table border=0><tr><td bgcolor="#999999">'."\n".
+	     '<table border=0>'."\n".
+	      '<tr><td bgcolor='.$headerclr.'>UserId</td><td bgcolor='.$headerclr.'>Domain</td>'."\n";
+  foreach my $part (@parts) {
+     my $display=&Apache::lonnet::metadata($url,$part.'.display');
+     if  (!$display) { $display = &Apache::lonnet::metadata($url,$part.'.name'); }
+     $result.='<td bgcolor='.$headerclr.'>'.$display.'</td>'."\n";
+   }
+  $result.="</tr>";
+  #get info for each student
+  foreach my $student ( sort(@{ $classlist{'allids'} }) ) {
+    $result.=&viewstudentgrade($url,$symb,$ENV{'request.course.id'},$student,@parts);
+  }
+  $result.='</table></td></tr></table><input type="submit" name="submit" value="Submit Changes" /></form>';
+
+  return $result;
+}
+
+sub editgrades {
+  my ($request) = @_;
+  my $result='';
+
+  my $symb=$ENV{'form.symb'};
+  if ($symb eq '') { $request->print("Unable to handle ambiguous references:$symb:$ENV{'form.url'}"); return ''; }
+  my $url=$ENV{'form.url'};
+  #get classlist
+  my ($cdom,$cnum) = split(/_/,$ENV{'request.course.id'});
+  #print "Found $cdom:$cnum<br />";
+  my (%classlist) = &getclasslist($cdom,$cnum,'0');
+
+  #get list of parts for this problem
+  my (@parts) = &getpartlist($url);
+
+  $result.='<form action="/adm/grades" method="post">'."\n".
+    '<input type="hidden" name="symb" value="'.$symb.'" />'."\n".
+      '<input type="hidden" name="url" value="'.$url.'" />'."\n".
+	'<input type="hidden" name="command" value="viewgrades" />'."\n".
+	  '<input type="submit" name="submit" value="See Grades" /> <br />'."\n";
+
+  foreach my $student ( sort(@{ $classlist{'allids'} }) ) {
+    $result.=&setstudentgrade($url,$symb,$ENV{'request.course.id'},$student,@parts);
+  }
+
+  $result.='<input type="submit" name="submit" value="See Grades" /></table></form>';
+  return $result;
+}
+
+sub send_header {
+  my ($request)= @_;
+  $request->print(&Apache::lontexconvert::header());
+#  $request->print("
+#<script>
+#remotewindow=open('','homeworkremote');
+#remotewindow.close();
+#</script>"); 
+  $request->print('<body bgcolor="#FFFFFF">');
+}
+
+sub send_footer {
+  my ($request)= @_;
+  $request->print('</body>');
+  $request->print(&Apache::lontexconvert::footer());
+}
+
 sub handler {
   my $request=$_[0];
 
@@ -23,13 +427,59 @@ sub handler {
   }
   $request->send_http_header;
   return OK if $request->header_only;
+  &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'});
   my $url=$ENV{'form.url'};
-  if ($url eq '') {
-    $request->print("Non-Contextual Access Unsupported");
+  my $symb=$ENV{'form.symb'};
+  my $command=$ENV{'form.command'};
+  if (!$url) {
+    my ($temp1,$temp2);
+    ($temp1,$temp2,$ENV{'form.url'})=split(/___/,$symb);
+    $url = $ENV{'form.url'};
+  }
+  &send_header($request);
+  if ($url eq '' && $symb eq '') {
+     if ($ENV{'user.adv'}) {
+         if (($ENV{'form.codeone'}) && ($ENV{'form.codetwo'}) &&
+             ($ENV{'form.codethree'})) {
+             my $token=$ENV{'form.codeone'}.'*'.$ENV{'form.codetwo'}.'*'.
+		        $ENV{'form.codethree'};
+             my ($tsymb,$tuname,$tudom,$tcrsid)=
+		 &Apache::lonnet::checkin($token);
+             if ($tsymb) {
+                my ($map,$id,$url)=split(/\_\_\_/,$tsymb);
+                if (&Apache::lonnet::allowed('mgr',$tcrsid)) {
+                   $request->print(
+                     &Apache::lonnet::ssi('/res/'.$url,
+                        ('grade_username' => $tuname,
+                         'grade_domain' => $tudom,
+                         'grade_courseid' => $tcrsid,
+                         'grade_symb' => $tsymb)));
+                } else {
+                   $request->print('<h1>Not authorized: '.$token.'</h1>');
+                }           
+	    } else {
+                $request->print('<h1>Not a valid DocID: '.$token.'</h1>');
+            }
+	 } else {
+             $request->print(&Apache::lonxml::tokeninputfield());
+         }
+     }
   } else {
-    $Apache::grades::viewgrades=&Apache::lonnet::allowed('vgr',$url);
+    $Apache::grades::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
+    if ($command eq 'submission') {
+      &listStudents($request) if ($ENV{'form.student'} eq '');
+      $request->print(&submission($request)) if ($ENV{'form.student'} ne '');
+    } elsif ($command eq 'viewgrades') {
+      $request->print(&viewgrades($request));
+    } elsif ($command eq 'editgrades') {
+      $request->print(&editgrades($request));
+    } elsif ($command eq 'verify') {
+      $request->print(&verifyreceipt($request));
+    } else {
+      $request->print("Unknown action: $command:");
+    }
   }
-
+  &send_footer($request);
   return OK;
 }