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    1: # The LON-CAPA Homework handler
    2: # Guy Albertelli
    3: # 11/30 Gerd Kortemeyer
    4: 
    5: package Apache::lonhomework;
    6: use strict;
    7: use Apache::style;
    8: use Apache::lonxml;
    9: use Apache::lonnet;
   10: use Apache::inputtags;
   11: use Apache::structuretags;
   12: use Apache::response;
   13: use Apache::hint;
   14: 
   15: sub get_target {
   16:   if ( $ENV{'request.state'} eq "published") {
   17:     if ( defined $ENV{'form.submit'}) {
   18:       return ('grade', 'web');
   19:     } else {
   20:       return ('web');
   21:     }
   22:   } elsif ($ENV{'request.state'} eq "construct") {
   23:     if ( defined $ENV{'form.preview'}) {
   24:       if ( defined $ENV{'form.submit'}) {
   25: 	return ('grade', 'web');
   26:       } else {
   27: 	return ('web');
   28:       }
   29:     } else {
   30:       return ('edit');
   31:     }
   32:   }
   33:   return ();
   34: }
   35: 
   36: sub setup_vars {
   37:   my ($target) = @_;
   38:   return ';'
   39: #  return ';$external::target='.$target.';';
   40: }
   41: 
   42: sub send_header {
   43:   my ($request)= @_;
   44:   $request->print(&Apache::lontexconvert::header());
   45:   $ENV{'request.uri'}=$request->uri;
   46: #  $request->print('<form name='.$ENV{'form.request.prefix'}.'lonhomework method="POST" action="'.$request->uri.'">');
   47: }
   48: 
   49: sub send_footer {
   50:   my ($request)= @_;
   51: #  $request->print('</form>');
   52:   $request->print(&Apache::lontexconvert::footer());
   53: }
   54: 
   55: #@Apache::lonhomework::date_status=();
   56: #@Apache::lonhomework::date_msg=();
   57: sub check_date {
   58:   my ($id) = @_;
   59:   my $date ='';
   60:   my $status = '';
   61:   my $datemsg = '';
   62:   my $lastdate = '';
   63:   my $temp;
   64:   my $type;
   65:   my $passed;
   66:   &Apache::lonxml::debug("checking for part :$id:");
   67:   foreach $temp ("opendate","duedate","answerdate") {
   68:     $lastdate = $date;
   69:     $date = &Apache::lonnet::EXT("resource.$id.$temp");
   70:     &Apache::lonxml::debug("found :$date: for :$temp:");
   71:     if ($date eq '') {
   72:       $date = "an unknown date"; $passed = 0;
   73:     } else {
   74:       if (time < $date) { $passed = 0; } else { $passed = 1; }
   75:       $date = localtime $date;
   76:     }
   77:     if (!$passed) { $type=$temp; last; }
   78:   }
   79:   &Apache::lonxml::debug("have :$type:$passed:");
   80:   if ($passed) {
   81:     $status='SHOW_ANSWER';
   82:     $datemsg=$date;
   83:   } elsif ($type eq 'opendate') {
   84:     $status='CLOSED';
   85:     $datemsg = "will open on $date";
   86:   } elsif ($type eq 'duedate') {
   87:     $status='CAN_ANSWER';
   88:     $datemsg = "is due at $date";
   89:   } elsif ($type eq 'answerdate') {
   90:     $status='CLOSED';
   91:     $datemsg = "was due as $lastdate, and answers will be available at $date";
   92:   }
   93:   &Apache::lonxml::debug("sending back :$status:$datemsg:");
   94:   return ($status,$datemsg);
   95: }
   96: 
   97: sub handler {
   98:   my $request=$_[0];
   99: 
  100:   if ( $ENV{'user.name'} eq 'albertel' ) { $Apache::lonxml::debug=1; }
  101:   
  102:   my (@targets) = &get_target();
  103: 
  104:   if ($ENV{'browser.mathml'}) {
  105:     $request->content_type('text/xml');
  106:   } else {
  107:     $request->content_type('text/html');
  108:   }
  109:   $request->send_http_header;
  110:   return 'OK' if $request->header_only;
  111:   
  112:   &Apache::lonhomework::send_header($request);
  113:   
  114:   #check if allowed to see
  115:   
  116:   foreach my $target (@targets) {
  117:     my $file=&Apache::lonnet::filelocation("",$request->uri);
  118:     my $problem=&Apache::lonnet::getfile($file);
  119:     if ($problem == -1) {
  120:       &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
  121:       $problem='';
  122:     }
  123:     
  124:     my %mystyle;
  125:     my $result = '';
  126:     &Apache::inputtags::initialize_inputtags;
  127:     %Apache::lonhomework::results=();
  128:     %Apache::lonhomework::history=&Apache::lonnet::restore;
  129:     #ignore error conditions
  130:     my ($temp)=keys %Apache::lonhomework::history ;
  131:     if ($temp =~ m/^error:.*/) { %Apache::lonhomework::history=(); } 
  132:     if ($target eq 'web' && &Apache::lonnet::symbread() eq '') {
  133:       $request->print("Vieiwing this problem as not a student, submissions will be ignored.");
  134:     }
  135:     if ($target eq 'grade') {
  136:       my $resultkey;
  137:       foreach $resultkey (sort keys %Apache::lonhomework::history) {
  138: 	&Apache::lonxml::debug("$resultkey ---- $Apache::lonhomework::history{$resultkey}");
  139:       }
  140:       &Apache::lonxml::debug("\n<br>restored values^</br>\n");
  141:     }
  142:     my $default=&Apache::lonnet::getfile('/home/httpd/html/res/adm/includes/default_homework.lcpm');
  143:     if ($default == -1) {
  144:       &Apache::lonxml::error("<b>Unable to find <i>default_homework.lcpm</i></b>");
  145:       $default='';
  146:     }
  147:     if ( $target eq 'grade') { 
  148:       $Apache::lonxml::textredirection = 0; 
  149:     } else {
  150:       $Apache::lonxml::textredirection = 1; 
  151:     }
  152:     $result = &Apache::lonxml::xmlparse($target, $problem,
  153: 			$default.&setup_vars($target),%mystyle);
  154: 
  155:     #$request->print("Result follows:");
  156:     $request->print($result);
  157:     #$request->print(":Result ends");
  158:     if ($target eq 'grade') {
  159:       my $resultkey;
  160:       foreach $resultkey (sort keys %Apache::lonhomework::results) {
  161: 	&Apache::lonxml::debug("$resultkey ---- $Apache::lonhomework::results{$resultkey}");
  162:       }
  163:       &Apache::lonxml::debug("\n<br>storing values^</br>\n");
  164:     }
  165:     
  166:     my ($temp) = keys %Apache::lonhomework::results;
  167:     if ( $temp ne '' ) {
  168:       &Apache::lonxml::debug("Store return message:".&Apache::lonnet::cstore(%Apache::lonhomework::results));
  169:     }
  170:   }
  171:   &Apache::lonhomework::send_footer($request);
  172:   
  173:   return 'OK';
  174: 
  175: }
  176: 
  177: 1;
  178: __END__