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version 1.24, 2000/12/21 18:13:33 version 1.164, 2004/02/13 21:27:22
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   # The LearningOnline Network with CAPA
 # The LON-CAPA Homework handler  # The LON-CAPA Homework handler
 # Guy Albertelli  #
 # 11/30 Gerd Kortemeyer  # $Id$
   #
   # 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/
   
   
 package Apache::lonhomework;  package Apache::lonhomework;
 use strict;  use strict;
 use Apache::style;  use Apache::style();
 use Apache::lonxml;  use Apache::lonxml();
 use Apache::lonnet;  use Apache::lonnet();
 use Apache::inputtags;  use Apache::lonplot();
 use Apache::structuretags;  use Apache::inputtags();
 use Apache::response;  use Apache::structuretags();
 use Apache::hint;  use Apache::randomlabel();
   use Apache::response();
   use Apache::hint();
   use Apache::outputtags();
   use Apache::caparesponse();
   use Apache::radiobuttonresponse();
   use Apache::optionresponse();
   use Apache::imageresponse();
   use Apache::essayresponse();
   use Apache::externalresponse();
   use Apache::rankresponse();
   use Apache::matchresponse();
   use Apache::chemresponse();
   use Apache::Constants qw(:common);
   use HTML::Entities();
   use Apache::loncommon();
   use Apache::lonlocal;
   #use Time::HiRes qw( gettimeofday tv_interval );
   
   BEGIN {
       &Apache::lonxml::register_insert();
   }
   
 sub get_target {  sub get_target {
   if ( $ENV{'request.state'} eq "published") {      if (($ENV{'request.state'} eq "published") ||
     if ( defined $ENV{'form.submit'}) {   ($ENV{'request.state'} eq "uploaded")) {
       return ('grade', 'web');   if ( defined($ENV{'form.grade_target'}  ) 
     } else {       && ($ENV{'form.grade_target'} eq 'tex')) {
       return ('web');      return ($ENV{'form.grade_target'});
     }   } elsif ( defined($ENV{'form.grade_target'}  ) 
   } elsif ($ENV{'request.state'} eq "construct") {    && ($Apache::lonhomework::viewgrades eq 'F' )) {
     if ( defined $ENV{'form.preview'}) {      return ($ENV{'form.grade_target'});
       if ( defined $ENV{'form.submit'}) {   }
  return ('grade', 'web');  
       } else {   if ( defined($ENV{'form.submitted'}) &&
  return ('web');       ( !defined($ENV{'form.resetdata'})) &&
       }       ( !defined($ENV{'form.newrandomization'}))) {
     } else {      return ('grade', 'web');
       return ('edit');   } else {
       return ('web');
    }
       } elsif ($ENV{'request.state'} eq "construct") {
    if ( defined($ENV{'form.grade_target'}) ) {
       return ($ENV{'form.grade_target'});
    }
    if ( defined($ENV{'form.preview'})) {
       if ( defined($ENV{'form.submitted'})) {
    return ('grade', 'web');
       } else {
    return ('web');
       }
    } else {
       if ( $ENV{'form.problemmode'} eq &mt('View') ||
    $ENV{'form.problemmode'} eq &mt('Discard Edits and View')) {
    if ( defined($ENV{'form.submitted'}) &&
        (!defined($ENV{'form.resetdata'})) &&
        (!defined($ENV{'form.newrandomization'}))) {
       return ('grade', 'web','answer');
    } else {
       return ('web','answer');
    }
       } elsif ( $ENV{'form.problemmode'} eq &mt('Edit') ) {
    if ( $ENV{'form.submitted'} eq 'edit' ) {
       if ( $ENV{'form.submit'} eq &mt('Submit Changes and View') ) {
    return ('modified','web','answer');
       } else {
    return ('modified','edit');
       }
    } else {
       return ('edit');
    }
       } else {
    return ('web');
       }
    }
     }      }
   }      return ();
   return ();  
 }  }
   
 sub setup_vars {  sub setup_vars {
   my ($target) = @_;      my ($target) = @_;
   return ';'      return ';'
 #  return ';$external::target='.$target.';';  #  return ';$external::target='.$target.';';
 }  }
   
 sub send_header {  sub send_header {
   my ($request)= @_;      my ($request)= @_;
   $request->print(&Apache::lontexconvert::header());      $request->print(&Apache::lontexconvert::header());
   $ENV{'request.uri'}=$request->uri;  
 #  $request->print('<form name='.$ENV{'form.request.prefix'}.'lonhomework method="POST" action="'.$request->uri.'">');  #  $request->print('<form name='.$ENV{'form.request.prefix'}.'lonhomework method="POST" action="'.$request->uri.'">');
 }  }
   
   sub createmenu {
       my ($which,$request)=@_;
       if ($which eq 'grade') {
    $request->print('<script language="JavaScript"> 
             hwkmenu=window.open("/res/adm/pages/homeworkmenu.html","homeworkremote",
                    "height=350,width=150,menubar=no");
             </script>');
       }
   }
   
 sub send_footer {  sub send_footer {
   my ($request)= @_;      my ($request)= @_;
 #  $request->print('</form>');  #  $request->print('</form>');
   $request->print(&Apache::lontexconvert::footer());      $request->print(&Apache::lontexconvert::footer());
   }
   
   $Apache::lonxml::browse='';
   
   sub check_ip_acc {
       my ($acc)=@_;
       if (!defined($acc) || $acc =~ /^\s*$/) { return 1; }
       my $allowed=0;
       my $ip=$ENV{'REMOTE_ADDR'};
       my $name;
       foreach my $pattern (split(',',$acc)) {
    if ($pattern =~ /\*$/) {
       #35.8.*
       $pattern=~s/\*//;
       if ($ip =~ /^\Q$pattern\E/) { $allowed=1; }
    } elsif ($pattern =~ /(\d+\.\d+\.\d+)\.\[(\d+)-(\d+)\]$/) {    
       #35.8.3.[34-56]
       my $low=$2;
       my $high=$3;
       $pattern=$1;
       if ($ip =~ /^\Q$pattern\E/) { 
    my $last=(split(/\./,$ip))[3];
    if ($last <=$high && $last >=$low) { $allowed=1; }
       }
    } elsif ($pattern =~ /^\*/) {
       #*.msu.edu
       $pattern=~s/\*//;
       if (!defined($name)) {
    use Socket;
    my $netaddr=inet_aton($ip);
    ($name)=gethostbyaddr($netaddr,AF_INET);
       }
       if ($name =~ /\Q$pattern\E$/i) { $allowed=1; }
    } elsif ($pattern =~ /\d+\.\d+\.\d+\.\d+/) {
       #127.0.0.1
       if ($ip =~ /^\Q$pattern\E/) { $allowed=1; }
    } else {
       #some.name.com
       if (!defined($name)) {
    use Socket;
    my $netaddr=inet_aton($ip);
    ($name)=gethostbyaddr($netaddr,AF_INET);
       }
       if ($name =~ /\Q$pattern\E$/i) { $allowed=1; }
    }
    if ($allowed) { last; }
       }
       return $allowed;
 }  }
   # JB, 9/24/2002: Any changes in this function may require a change
   # in lonnavmaps::resource::getDateStatus.
   sub check_access {
       my ($id) = @_;
       my $date ='';
       my $status;
       my $datemsg = '';
       my $lastdate = '';
       my $temp;
       my $type;
       my $passed;
   
       if ($ENV{'request.state'} eq "construct") {
    &Apache::lonxml::debug("in construction ignoring dates");
    $status='CAN_ANSWER';
    $datemsg=&mt('is in under construction');
   # return ($status,$datemsg);
       }
   
       &Apache::lonxml::debug("checking for part :$id:");
       &Apache::lonxml::debug("time:".time);
   
       if ($ENV{'request.state'} ne "construct") {
    my $allowed=&check_ip_acc(&Apache::lonnet::EXT("resource.$id.acc"));
    if (!$allowed && ($Apache::lonhomework::browse ne 'F')) {
       $status='INVALID_ACCESS';
       $date=&mt("can not be accessed from your location.");
       return($status,$date);
    }
   
    foreach $temp ("opendate","duedate","answerdate") {
       $lastdate = $date;
       $date = &Apache::lonnet::EXT("resource.$id.$temp");
       my $thistype = &Apache::lonnet::EXT("resource.$id.$temp.type");
       if ($thistype =~ /^(con_lost|no_such_host)/ ||
    $date     =~ /^(con_lost|no_such_host)/) {
    $status='UNAVAILABLE';
    $date=&mt("may open later.");
    return($status,$date);
       }
       if ($thistype eq 'date_interval') {
    if ($temp eq 'opendate') {
       $date=&Apache::lonnet::EXT("resource.$id.duedate")-$date;
    }
    if ($temp eq 'answerdate') {
       $date=&Apache::lonnet::EXT("resource.$id.duedate")+$date;
    }
       }
       &Apache::lonxml::debug("found :$date: for :$temp:");
       if ($date eq '') {
    $date = &mt("an unknown date"); $passed = 0;
       } elsif ($date eq 'con_lost') {
    $date = &mt("an indeterminate date"); $passed = 0;
       } else {
    if (time < $date) { $passed = 0; } else { $passed = 1; }
    $date = localtime $date;
       }
       if (!$passed) { $type=$temp; last; }
    }
    &Apache::lonxml::debug("have :$type:$passed:");
    if ($passed) {
       $status='SHOW_ANSWER';
       $datemsg=$date;
    } elsif ($type eq 'opendate') {
       $status='CLOSED';
       $datemsg = &mt("will open on")." $date";
    } elsif ($type eq 'duedate') {
       $status='CAN_ANSWER';
       $datemsg = &mt("is due at")." $date";
    } elsif ($type eq 'answerdate') {
       $status='CLOSED';
       $datemsg = &mt("was due on")." $lastdate".&mt(", and answers will be available on")." $date";
    }
       }
       if ($status eq 'CAN_ANSWER') {
    #check #tries, and if correct.
    my $tries = $Apache::lonhomework::history{"resource.$id.tries"};
    my $maxtries = &Apache::lonnet::EXT("resource.$id.maxtries");
    if ( $tries eq '' ) { $tries = '0'; }
    if ( $maxtries eq '' && 
        $ENV{'request.state'} ne 'construct') { $maxtries = '2'; } 
    if ($maxtries && $tries >= $maxtries) { $status = 'CANNOT_ANSWER'; }
    # if (correct and show prob status) or excused then CANNOT_ANSWER
    if(($Apache::lonhomework::history{"resource.$id.solved"}=~/^correct/
       &&
       lc($Apache::lonhomework::problemstatus) ne 'no')
      ||
      $Apache::lonhomework::history{"resource.$id.solved"}=~/^excused/) {
       $status = 'CANNOT_ANSWER';
    }
       }
   
     #if (($status ne 'CLOSED') && ($Apache::lonhomework::type eq 'exam') &&
     #    (!$Apache::lonhomework::history{"resource.0.outtoken"})) {
     #    return ('UNCHECKEDOUT','needs to be checked out');
     #}
   
   
 #@Apache::lonhomework::date_status=();      &Apache::lonxml::debug("sending back :$status:$datemsg:");
 #@Apache::lonhomework::date_msg=();      if (($Apache::lonhomework::browse eq 'F') && ($status eq 'CLOSED')) {
 sub check_date {   &Apache::lonxml::debug("should be allowed to browse a resource when closed");
   my ($id) = @_;   $status='CAN_ANSWER';
   my $date ='';   $datemsg=&mt('is closed but you are allowed to view it');
   my $status = '';      }
   my $datemsg = '';  
   my $lastdate = '';      return ($status,$datemsg);
   my $temp;  }
   my $type;  
   my $passed;  sub showhash {
   &Apache::lonxml::debug("checking for part :$id:");      my (%hash) = @_;
   foreach $temp ("opendate","duedate","answerdate") {      &showhashsubset(\%hash,'.');
     $lastdate = $date;      return '';
     $date = &Apache::lonnet::EXT("resource.$id.$temp");  }
     &Apache::lonxml::debug("found :$date: for :$temp:");  
     if ($date eq '') {  sub showarray {
       $date = "an unknown date"; $passed = 0;      my ($array)=@_;
       my $string="(";
       foreach my $elm (@{ $array }) {
    if (ref($elm)) {
       if ($elm =~ /ARRAY/ ) {
    $string.=&showarray($elm);
       }
    } else {
       $string.="$elm,"
    }
       }
       chop($string);
       $string.=")";
       return $string;
   }
   
   sub showhashsubset {
       my ($hash,$keyre) = @_;
       my $resultkey;
       foreach $resultkey (sort keys %$hash) {
    if ($resultkey =~ /$keyre/) {
       if (ref($$hash{$resultkey})) {
    if ($$hash{$resultkey} =~ /ARRAY/ ) {
       &Apache::lonxml::debug("$resultkey ---- ".
      &showarray($$hash{$resultkey}));
    } elsif ($$hash{$resultkey} =~ /HASH/ ) {
       &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
       &showhashsubset($$hash{$resultkey},'.');
    } else {
       &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
    }
       } else {
    &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
       }
    }
       }
       &Apache::lonxml::debug("\n<br />restored values^</br>\n");
       return '';
   }
   
   sub setuppermissions {
       $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
       my $viewgrades = &Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
       if (! $viewgrades && 
    exists($ENV{'request.course.sec'}) && 
    $ENV{'request.course.sec'} !~ /^\s*$/) {
    $viewgrades = &Apache::lonnet::allowed('vgr',$ENV{'request.course.id'}.
                                                  '/'.$ENV{'request.course.sec'});
       }
       $Apache::lonhomework::viewgrades = $viewgrades;
       return ''
   }
   
   sub setupheader {
       my $request=$_[0];
       if ($ENV{'browser.mathml'}) {
    &Apache::loncommon::content_type($request,'text/xml');
     } else {      } else {
       if (time < $date) { $passed = 0; } else { $passed = 1; }   &Apache::loncommon::content_type($request,'text/html');
       $date = localtime $date;  
     }      }
     if (!$passed) { $type=$temp; last; }      if (!$Apache::lonxml::debug && ($ENV{'REQUEST_METHOD'} eq 'GET')) {
   }   &Apache::loncommon::no_cache($request);
   &Apache::lonxml::debug("have :$type:$passed:");      }
   if ($passed) {      $request->send_http_header;
     $status='SHOW_ANSWER';      return OK if $request->header_only;
     $datemsg=$date;      return ''
   } elsif ($type eq 'opendate') {  
     $status='CLOSED';  
     $datemsg = "will open on $date";  
   } elsif ($type eq 'duedate') {  
     $status='CAN_ANSWER';  
     $datemsg = "is due at $date";  
   } elsif ($type eq 'answerdate') {  
     $status='CLOSED';  
     $datemsg = "was due as $lastdate, and answers will be available at $date";  
   }  
   &Apache::lonxml::debug("sending back :$status:$datemsg:");  
   if ($ENV{'request.state'} eq "construct") {  
     &Apache::lonxml::debug("in construction ignoring dates");  
     $status='CAN_ANSWER';  
     $datemsg='is in under construction';  
   }  
   return ($status,$datemsg);  
 }  }
   
 sub handler {  sub handle_save_or_undo {
   my $request=$_[0];      my ($request,$problem,$result) = @_;
       my $file    = &Apache::lonnet::filelocation("",$request->uri);
       my $filebak =$file.".bak";
       my $filetmp =$file.".tmp";
       my $error=0;
   
       &Apache::lonnet::correct_line_ends($result);
   
       if ($ENV{'form.Undo'} eq &mt('undo')) {
    my $error=0;
    if (!copy($file,$filetmp)) { $error=1; }
    if ((!$error) && (!copy($filebak,$file))) { $error=1; }
    if ((!$error) && (!move($filetmp,$filebak))) { $error=1; }
    if (!$error) {
       $request->print("<p><b>".&mt("Undid changes, Switched")." $filebak ".&mt("and")." $file</b></p>");
    } else {
       $request->print("<p><font color=\"red\" size=\"+1\"><b>".&mt("Unable to undo, unable to switch")." $filebak ".&mt("and")." $file</b></font></p>");
       $error=1;
    }
       } else {
    my $fs=Apache::File->new(">$filebak");
    if (defined($fs)) {
       print $fs $$problem;
       $request->print("<b>".&mt("Making Backup to").
       " $filebak</b><br />");
    } else {
       $request->print("<font color=\"red\" size=\"+1\"><b>".&mt("Unable to make backup")." $filebak</b></font>");
       $error=2;
    }
    my $fh=Apache::File->new(">$file");
    if (defined($fh)) {
       print $fh $$result;
       $request->print("<b>".&mt("Saving Modifications to").
       " $file</b><br />");
    } else {
       $request->print("<font color=\"red\" size=\"+1\"><b>".
       &mt("Unable to write to")." $file</b></font>");
       $error|=4;
    }
       }
       return $error;
   }
   
   if ( $ENV{'user.name'} eq 'albertel' ) { $Apache::lonxml::debug=1; }  sub analyze_header {
         my ($request) = @_;
   my (@targets) = &get_target();      my $result.='<html>
               <head><title>'.&mt("Analyzing a problem").'</title></head>
   if ($ENV{'browser.mathml'}) {              <body bgcolor="#FFFFFF">
     $request->content_type('text/xml');              <form name="lonhomework" method="POST" action="'.
   } else {      $ENV{'request.uri'}.'">
     $request->content_type('text/html');              <input type="submit" name="problemmode" value="'.&mt("EditXML").'" />
   }              <input type="submit" name="problemmode" value="'.&mt('Edit').'" />
   $request->send_http_header;              <hr />
   return 'OK' if $request->header_only;              <input type="submit" name="submit" value="'.&mt("View").'" />
                 <hr />
   &Apache::lonhomework::send_header($request);              '.&mt('List of possible answers').':
                 </form>';
   #check if allowed to see      $request->print($result);
         $request->rflush();
   foreach my $target (@targets) {  }
     my $file=&Apache::lonnet::filelocation("",$request->uri);  
   sub analyze_footer {
       my ($request) = @_;
       my $result='</body></html>';
       $request->print($result);
       $request->rflush();
   }
   
   sub analyze {
       my ($request,$file) = @_;
       &Apache::lonxml::debug("Analyze");
       my $result;
       my %overall;
       my %allparts;
       my $rndseed=$ENV{'form.rndseed'};
       &analyze_header($request);
       my %prog_state=
    &Apache::lonhtmlcommon::Create_PrgWin($request,&mt('Analyze Progress'),
         &mt('Getting Problem Variants'),
         $ENV{'form.numtoanalyze'});
       for(my $i=1;$i<$ENV{'form.numtoanalyze'}+1;$i++) {
    &Apache::lonhtmlcommon::Increment_PrgWin($request,\%prog_state,
    &mt('last problem'));
    my $subresult=&Apache::lonnet::ssi($request->uri,
      ('grade_target' => 'analyze'),
      ('rndseed' => $i+$rndseed));
    (my $garbage,$subresult)=split(/_HASH_REF__/,$subresult,2);
    my %analyze=&Apache::lonnet::str2hash($subresult);
    my @parts;
    if (defined(@{ $analyze{'parts'} })) {
       @parts=@{ $analyze{'parts'} };
    }
    foreach my $part (@parts) {
       if (!exists($allparts{$part})) {$allparts{$part}=1;};
       if ($analyze{$part.'.type'} eq 'numericalresponse' ||
    $analyze{$part.'.type'} eq 'stringresponse' ||
    $analyze{$part.'.type'} eq 'formularesponse'   ) {
    push( @{ $overall{$part.'.answer'} },
         [@{ $analyze{$part.'.answer'} }]);
       }
    }
       }
       &Apache::lonhtmlcommon::Update_PrgWin($request,\%prog_state,
     &mt('Analyzing Results'));
       foreach my $part (sort(keys(%allparts))) {
    if (defined(@{ $overall{$part.'.answer'} })) {
       my $num_cols=scalar(@{ $overall{$part.'.answer'}->[0] });
       $request->print('<table><tr><td colspan="'.($num_cols+1).'">'.&mt('Part').' '.$part.'</td></tr>');
       my %frequency;
       foreach my $answer (sort {$a->[0] <=> $b->[0]} (@{ $overall{$part.'.answer'} })) {
    $frequency{join("\0",@{ $answer })}++;
       }
       $request->print('<tr><td colspan="'.($num_cols).'">'.&mt('Answer').'</td><td>'.&mt('Frequency').'</td></tr>');
       foreach my $answer (sort {(split("\0",$a))[0] <=> (split("\0",$b))[0]} (keys(%frequency))) {
    $request->print('<tr><td align="right">'.
    join('</td><td align="right">',split("\0",$answer)).
    '</td><td>('.$frequency{$answer}.
    ')</td></tr>');
       }
       $request->print('</table>');
    } else {
       $request->print('<p>'.&mt('Response').' '.$part.' '.
       &mt('is not analyzable at this time').'</p>');
    }
       }
       if (scalar(keys(%allparts)) == 0 ) {
    $request->print('<p>'.&mt('Found no analyzable respones in this problem, currently only Numerical, Formula and String response styles are supported.').'</p>');
       }
       &Apache::lonhtmlcommon::Close_PrgWin($request,\%prog_state);
       &analyze_footer($request);
       &Apache::lonhomework::showhash(%overall);
       return $result;
   }
   
   sub editxmlmode {
       my ($request,$file) = @_;
       my $result;
     my $problem=&Apache::lonnet::getfile($file);      my $problem=&Apache::lonnet::getfile($file);
     if ($problem == -1) {      if ($problem eq -1) {
       &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");   &Apache::lonxml::error("<b> ".&mt('Unable to find').
       $problem='';         " <i>$file</i></b>");
    $problem='';
     }      }
           if (defined($ENV{'form.editxmltext'}) || defined($ENV{'form.Undo'})) {
     my %mystyle;   my $error=&handle_save_or_undo($request,\$problem,
     my $result = '';         \$ENV{'form.editxmltext'});
     &Apache::inputtags::initialize_inputtags;   if (!$error) { $problem=&Apache::lonnet::getfile($file); }
     %Apache::lonhomework::results=();  
     %Apache::lonhomework::history=&Apache::lonnet::restore;  
     #ignore error conditions  
     my ($temp)=keys %Apache::lonhomework::history ;  
     if ($temp =~ m/^error:.*/) { %Apache::lonhomework::history=(); }   
     if ($target eq 'web' && &Apache::lonnet::symbread() eq '') {  
       $request->print("Vieiwing this problem as not a student, submissions will be ignored.");  
     }  
     if ($target eq 'grade') {  
       my $resultkey;  
       foreach $resultkey (sort keys %Apache::lonhomework::history) {  
  &Apache::lonxml::debug("$resultkey ---- $Apache::lonhomework::history{$resultkey}");  
       }  
       &Apache::lonxml::debug("\n<br>restored values^</br>\n");  
     }  
     my $default=&Apache::lonnet::getfile('/home/httpd/html/res/adm/includes/default_homework.lcpm');  
     if ($default == -1) {  
       &Apache::lonxml::error("<b>Unable to find <i>default_homework.lcpm</i></b>");  
       $default='';  
     }      }
     if ( $target eq 'grade') {       &Apache::lonhomework::showhashsubset(\%ENV,'^form');
       $Apache::lonxml::textredirection = 0;       if ( $ENV{'form.submit'} eq &mt('Submit Changes and View') ) {
    &Apache::lonhomework::showhashsubset(\%ENV,'^form');
    $ENV{'form.problemmode'}='View';
    &renderpage($request,$file);
     } else {      } else {
       $Apache::lonxml::textredirection = 1;    my ($rows,$cols) = &Apache::edit::textarea_sizes(\$problem);
    my $xml_help = '<table><tr><td>'.
       &Apache::loncommon::helpLatexCheatsheet("Problem_Editor_XML_Index",
       "Problem Editing Help").
       '</td><td>'.
          &Apache::loncommon::help_open_faq(5).
          &Apache::loncommon::help_open_bug('Authoring').'</td></tr></table>';
    if ($cols > 80) { $cols = 80; }
    if ($cols < 70) { $cols = 70; }
    if ($rows < 20) { $rows = 20; }
    $result.='<html><body bgcolor="#FFFFFF">
               <form name="lonhomework" method="POST" action="'.
       $ENV{'request.uri'}.'">
               <input type="hidden" name="problemmode" value="'.&mt('EditXML').'" />
               <input type="submit" name="problemmode" value="'.&mt('Discard Edits and View').'" />
               <input type="submit" name="problemmode" value="'.&mt('Edit').'" />
               <hr />
               <input type="submit" name="submit" value="'.&mt('Submit Changes').'" />
               <input type="submit" name="submit" value="'.&mt('Submit Changes and View').'" />
               <input type="submit" name="Undo" value="'.&mt('undo').'" />
               <hr />
               ' . $xml_help . '
               <textarea rows="'.$rows.'" cols="'.$cols.'" name="editxmltext">'.
       &HTML::Entities::encode($problem).'</textarea>
               </form></body></html>';
    $request->print($result);
     }      }
     $result = &Apache::lonxml::xmlparse($target, $problem,      return '';
  $default.&setup_vars($target),%mystyle);  }
   
     #$request->print("Result follows:");  sub renderpage {
     $request->print($result);      my ($request,$file) = @_;
     #$request->print(":Result ends");  
     if ($target eq 'grade') {      my (@targets) = &get_target();
       my $resultkey;      &Apache::lonhomework::showhashsubset(\%ENV,'form.');
       foreach $resultkey (sort keys %Apache::lonhomework::results) {      &Apache::lonxml::debug("Running targets ".join(':',@targets));
  &Apache::lonxml::debug("$resultkey ---- $Apache::lonhomework::results{$resultkey}");      foreach my $target (@targets) {
       }   #my $t0 = [&gettimeofday()];
       &Apache::lonxml::debug("\n<br>storing values^</br>\n");   my $problem=&Apache::lonnet::getfile($file);
    if ($problem eq -1) {
       &Apache::lonxml::error("<b> ".&mt('Unable to find')." <i>$file</i></b>");
       $problem='';
    }
   
    my %mystyle;
    my $result = '';
    if ($target eq 'analyze') { %Apache::lonhomework::analyze=(); }
    if ($target eq 'answer') { &showhash(%Apache::lonhomework::history); }
    if ($target eq 'web') {&Apache::lonhomework::showhashsubset(\%ENV,'^form');}
   
    &Apache::lonxml::debug("Should be parsing now");
    $result = &Apache::lonxml::xmlparse($request, $target, $problem,
       &setup_vars($target),%mystyle);
    undef($Apache::lonhomework::parsing_a_problem);
    #$request->print("Result follows:");
    if ($target eq 'modified') {
       &handle_save_or_undo($request,\$problem,\$result);
    } else {
       if ($target eq 'analyze') {
    $result=&Apache::lonnet::hashref2str(\%Apache::lonhomework::analyze);
    undef(%Apache::lonhomework::analyze);
       }
       #my $td=&tv_interval($t0);
       #if ( $Apache::lonxml::debug) {
       #$result =~ s:</body>::;
       #$result.="<br />Spent $td seconds processing target $target\n</body>";
       #}
       $request->print($result);
       $request->rflush();
    }
    #$request->print(":Result ends");
    #my $td=&tv_interval($t0);
       }
   }
   
   # with no arg it returns a HTML <option> list of the template titles
   # with one arg it returns the filename associated with the arg passed
   sub get_template_list {
       my ($namewanted,$extension) = @_;
       my $result;
       my @allnames;
       &Apache::lonxml::debug("Looking for :$extension:");
       foreach my $file (</home/httpd/html/res/adm/includes/templates/*.$extension>) {
    my $name=&Apache::lonnet::metadata($file,'title');
    if ($namewanted && ($name eq $namewanted)) {
       $result=$file;
       last;
    } else {
       if ($name) { push (@allnames, $name); }
    }
       }
       if (@allnames && !$result) {
    $result="<option>".&mt("Select a")." $extension ".&mt('template')."</option>\n<option>".
       join('</option><option>',sort(@allnames)).'</option>';
       }
       return $result;
   }
   
   sub newproblem {
       my ($request) = @_;
       my $extension=$request->uri;
       $extension=~s:^.*\.([\w]+)$:$1:;
       &Apache::lonxml::debug("Looking for :$extension:");
       my $templatelist=&get_template_list('',$extension);
       if ($ENV{'form.template'} &&
    $ENV{'form.template'} ne "Select a $extension template") {
    use File::Copy;
    my $file = &get_template_list($ENV{'form.template'},$extension);
    my $dest = &Apache::lonnet::filelocation("",$request->uri);
    copy($file,$dest);
    &renderpage($request,$dest);
       } elsif($ENV{'form.newfile'} && !$templatelist) {
    # I don't like hard-coded filenames but for now, this will work.
    use File::Copy;
    my $templatefilename =
       $request->dir_config('lonIncludes').'/templates/blank.problem';
    &Apache::lonxml::debug("$templatefilename");
    my $dest = &Apache::lonnet::filelocation("",$request->uri);
    copy($templatefilename,$dest);
    &renderpage($request,$dest);
       } else {
    my $url=$request->uri;
    my $shownurl=$url;
    $shownurl=~s-^/~-/priv/-;
    my $dest = &Apache::lonnet::filelocation("",$request->uri);
    my $errormsg;
    if ($ENV{'form.newfile'}) {
       $errormsg='<p><font color="red">'.&mt('You did not select a template.').'</font></p>'."\n";
    }
    my $instructions;
    my $bodytag=&Apache::loncommon::bodytag(undef,undef,undef,1);
    if ($templatelist) { $instructions=&mt(", select a template from the pull-down menu below.").'<br />'.&mt("Then");}
    my %lt=&Apache::lonlocal::texthash( 'create' => 'Creating a new',
     'resource' => 'resource',
     'requested' => 'The requested file',
     'not exist' => 'currently does not exist',
     'createnew' => 'To create a new',
     'click' => 'click on the',
     'Create' => 'Create',
     'button' => 'button');
    $request->print(<<ENDNEWPROBLEM);
   $bodytag
   <h1>$lt{'create'} $extension $lt{'resource'}</h1>
   $errormsg
   $lt{'requested'} <tt>$shownurl</tt> $lt{'not exist'}.
   <p>
   <b>$lt{'createnew'} $extension$instructions $lt{'click'} "$lt{'Create'} $extension" $lt{'button'}.</b>
   </p>
   <p><form action="$url" method="POST">
   ENDNEWPROBLEM
    if (defined($templatelist)) {
       $request->print("<select name=\"template\">$templatelist</select>");
    }
    $request->print("<br /><input type=\"submit\" name=\"newfile\" value=\"".&mt('Create')." $extension\" />");
    $request->print("</form></p></body>");
     }      }
       return '';
   }
   
   sub view_or_edit_menu {
       my ($request) = @_;
       my $url=$request->uri;
       my %lt=&Apache::lonlocal::texthash( 'would' => 'Would you like to',
         'view' => 'View',
         'Edit' => 'edit',
         'or' => 'or',
         'the problem' => 'the problem');
       $request->print(<<EDITMENU);
   <body bgcolor="#FFFFFF">
   <form action="$url" method="POST">
   $lt{'would'} <input type="submit" name="problemmode" value="&lt{'view'}">
   &lt{'or'} <input type="submit" name="problemmode" value="&lt{'Edit'}">
   &lt{'the problem'}.
   </form>
   </body>
   EDITMENU
   }
   
   sub handler {
       #my $t0 = [&gettimeofday()];
       my $request=$_[0];
           
     my ($temp) = keys %Apache::lonhomework::results;      $Apache::lonxml::debug=$ENV{'user.debug'};
     if ( $temp ne '' ) {      if (&setupheader($request)) { return OK; }
       &Apache::lonxml::debug("Store return message:".&Apache::lonnet::cstore(%Apache::lonhomework::results));      $ENV{'request.uri'}=$request->uri;
     }  
   }      #setup permissions
   &Apache::lonhomework::send_footer($request);      $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
         $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
   return 'OK';      &Apache::lonxml::debug("Permissions:$Apache::lonhomework::browse:$Apache::lonhomework::viewgrades:");
       # some times multiple problemmodes are submitted, need to select
       # the last one
       &Apache::lonxml::debug("Problem Mode ".$ENV{'form.problemmode'});
       if ( defined($ENV{'form.problemmode'}) &&
    ref($ENV{'form.problemmode'}) ) {
    &Apache::lonxml::debug("Problem Mode ".join(",",@$ENV{'form.problemmode'}));
    my $mode=$ENV{'form.problemmode'}->[-1];
    undef $ENV{'form.problemmode'};
    $ENV{'form.problemmode'}=$mode;
       }
       &Apache::lonxml::debug("Problem Mode ".$ENV{'form.problemmode'});
       my $file=&Apache::lonnet::filelocation("",$request->uri);
   
       #check if we know where we are
       if ($ENV{'request.course.fn'} && !&Apache::lonnet::symbread()) { 
    # if we are browsing we might not be able to know where we are
    if ($Apache::lonhomework::browse ne 'F') {
       #should know where we are, so ask
       if ( &Apache::lonnet::mod_perl_version() == 2 ) {
    &Apache::lonnet::cleanenv();
       }
       $request->internal_redirect('/adm/ambiguous'); return;
    }
       }
   
       my ($symb) = &Apache::lonxml::whichuser();
       &Apache::lonxml::debug('symb is '.$symb);
       if ($ENV{'request.state'} eq "construct" || $symb eq '') {
    if ($ENV{'form.resetdata'} eq &mt('Reset Submissions') ||
       $ENV{'form.resetdata'} eq &mt('New Problem Variation') ||
       $ENV{'form.newrandomization'} eq &mt('New Randomization')) {
       my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
       &Apache::lonnet::tmpreset($symb,'',$domain,$name);
       &Apache::lonxml::debug("Attempt reset");
    }
       }
       if ($ENV{'request.state'} eq "construct") {
    if ( -e $file ) {
       &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
       ['problemmode']);
       if (!(defined $ENV{'form.problemmode'})) {
    #first visit to problem in construction space
    #&view_or_edit_menu($request);
    $ENV{'form.problemmode'}='View';
    &renderpage($request,$file);
       } elsif ($ENV{'form.problemmode'} eq &mt('EditXML')) {
    &editxmlmode($request,$file);
       } elsif ($ENV{'form.problemmode'} eq &mt('Calculate answers')) {
    &analyze($request,$file);
       } else {
    &renderpage($request,$file);
       }
    } else {
       # requested file doesn't exist in contruction space
       &newproblem($request);
    }
       } else {
    # just render the page normally outside of construction space
    &Apache::lonxml::debug("not construct");
    &renderpage($request,$file);
       }
       #my $td=&tv_interval($t0);
       #&Apache::lonxml::debug("Spent $td seconds processing");
       # &Apache::lonhomework::send_footer($request);
       # always turn off debug messages
       $Apache::lonxml::debug=0;
       return OK;
   
 }  }
   
Removed from v.1.24  
changed lines
  Added in v.1.164

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500 Internal Server Error

Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator at root@localhost to inform them of the time this error occurred, and the actions you performed just before this error.

More information about this error may be available in the server error log.