File:  [LON-CAPA] / loncom / homework / lonhomework.pm
Revision 1.40: download - view: text, annotated - select for diffs
Mon Apr 16 23:16:31 2001 UTC (22 years, 11 months ago) by albertel
Branches: MAIN
CVS tags: HEAD
- modified store/cstore/restore to take optional args rather than look
  through the enviroment.

# The LON-CAPA Homework handler
# Guy Albertelli
# 11/30 Gerd Kortemeyer
# 6/1 Gerd Kortemeyer

package Apache::lonhomework;
use strict;
use Apache::style;
use Apache::lonxml;
use Apache::lonnet;
use Apache::inputtags;
use Apache::structuretags;
use Apache::response;
use Apache::hint;
use Apache::outputtags;
use Apache::Constants qw(:common);

sub get_target {
  if ( $ENV{'request.state'} eq "published") {
    if ( defined $ENV{'form.submitted'}) {
      return ('grade', 'web');
    } else {
      return ('web');
    }
  } elsif ($ENV{'request.state'} eq "construct") {
    if ( defined $ENV{'form.preview'}) {
      if ( defined $ENV{'form.submitted'}) {
	return ('grade', 'web');
      } else {
	return ('web');
      }
    } else {
      return ('grade','web');
      if ( $ENV{'form.submitted'} eq 'edit' ) {
	return ('modified','edit');
      } else {
	return ('edit');
      }
    }
  }
  return ();
}

sub setup_vars {
  my ($target) = @_;
  return ';'
#  return ';$external::target='.$target.';';
}

sub send_header {
  my ($request)= @_;
  $request->print(&Apache::lontexconvert::header());
  $ENV{'request.uri'}=$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 {
  my ($request)= @_;
#  $request->print('</form>');
  $request->print(&Apache::lontexconvert::footer());
}

$Apache::lonxml::browse='';
sub check_date {
  my ($id) = @_;
  my $date ='';
  my $status = '';
  my $datemsg = '';
  my $lastdate = '';
  my $temp;
  my $type;
  my $passed;
  &Apache::lonxml::debug("checking for part :$id:");
  foreach $temp ("opendate","duedate","answerdate") {
    $lastdate = $date;
    $date = &Apache::lonnet::EXT("resource.$id.$temp");
    &Apache::lonxml::debug("found :$date: for :$temp:");
    if ($date eq '') {
      $date = "an unknown date"; $passed = 0;
    } elsif ($date eq 'con_lost') {
      $date = "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 = "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 on $lastdate, and answers will be available on $date";
  }
  if ($status eq 'CAN_ANSWER') {
    #check #tries
    my $tries = $Apache::lonhomework::history{"resource.$id.tries"};
    my $maxtries = &Apache::lonnet::EXT("resource.$id.maxtries");
    if ( $tries eq '' ) { $tries = '0'; }
    if ( $maxtries eq '' ) { $maxtries = '2'; } 
    if ($tries >= $maxtries) { $status = 'CANNOT_ANSWER'; } 
  }
  &Apache::lonxml::debug("sending back :$status:$datemsg:");
  if (($Apache::lonhomework::browse eq 'F') && ($status eq 'CLOSED')) {
    &Apache::lonxml::debug("should be allowed to browse a resource when closed");
    $status='CAN_ANSWER';
    $datemsg='is closed but you are allowed to view it';
  }
  if ($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 {
  my $request=$_[0];
  
 if ( $ENV{'user.name'} eq 'albertel' ) {$Apache::lonxml::debug=1;}
  
  my (@targets) = &get_target();

  if ($ENV{'browser.mathml'}) {
    $request->content_type('text/xml');
  } else {
    $request->content_type('text/html');
  }
  $request->send_http_header;
  return OK if $request->header_only;

  #setup permissions
  $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
  $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});

  #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
      $request->internal_redirect('/adm/ambiguous'); return; 
    }
  }

  &Apache::lonhomework::send_header($request);
  &Apache::lonxml::debug("Permissions:$Apache::lonhomework::browse:$Apache::lonhomework::viewgrades:");
  
  foreach my $target (@targets) {
    my $file=&Apache::lonnet::filelocation("",$request->uri);
    my $problem=&Apache::lonnet::getfile($file);
    if ($problem == -1) {
      &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
      $problem='';
    }
    
    my %mystyle;
    my $result = '';
    &Apache::inputtags::initialize_inputtags;
    %Apache::lonhomework::results=();
    %Apache::lonhomework::history=&Apache::lonnet::restore();
    #ignore error conditions
    my ($temp)=keys %Apache::lonhomework::history ;
    if ($temp =~ m/^error:.*/) { %Apache::lonhomework::history=(); } 
    if ($target eq 'web') {
      if (&Apache::lonnet::symbread() eq '') {
	if ($ENV{'request.state'} eq "construct") {
	  $request->print("In construction space, submissions ignored<br />");
	} else {
	  $request->print("Browsing or <a href=\"/adm/ambiguous\">ambiguous</a> reference, submissions ignored<br />");
	}
      }
      if ($Apache::lonhomework::viewgrades eq 'F') {&createmenu('grade',$request); }
    }
    if ($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='';
    }
    $result = &Apache::lonxml::xmlparse($target, $problem,
			$default.&setup_vars($target),%mystyle);

    #$request->print("Result follows:");
    if ($target eq 'modified') {
      my $fileout = &Apache::lonnet::filelocation("",$request->uri);
      my $filesave=$fileout.".bak";

      my $fs=Apache::File->new(">$filesave");
      print $fs $problem;
      $request->print("<b>Making Backup to $filesave</b><br />");

      my $fh=Apache::File->new(">$fileout");
      print $fh $result;
      $request->print("<b>Saving Modifications to $fileout</b><br />");
    } else {
      $request->print($result);
    }
    #$request->print(":Result ends");
    if ($target eq 'grade') {

      my $resultkey;
      foreach $resultkey (sort keys %Apache::lonhomework::results) {
	&Apache::lonxml::debug("$resultkey ---- $Apache::lonhomework::results{$resultkey}");
      }
      &Apache::lonxml::debug("\n<br />storing values^</br>\n");
    }
    
    my ($temp) = keys %Apache::lonhomework::results;
    if ( $temp ne '' ) {
      &Apache::lonxml::debug("Store return message:".&Apache::lonnet::cstore(\%Apache::lonhomework::results));
    }
  }
  &Apache::lonhomework::send_footer($request);
  # always turn of debug messages
  $Apache::lonxml::debug=0;
  return OK;

}

1;
__END__

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