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    1: # The LON-CAPA Homework handler
    2: # Guy Albertelli
    3: # 11/30 Gerd Kortemeyer
    4: # 6/1 Gerd Kortemeyer
    5: 
    6: package Apache::lonhomework;
    7: use strict;
    8: use Apache::style;
    9: use Apache::lonxml;
   10: use Apache::lonnet;
   11: use Apache::inputtags;
   12: use Apache::structuretags;
   13: use Apache::response;
   14: use Apache::hint;
   15: use Apache::Constants qw(:common);
   16: 
   17: sub get_target {
   18:   if ( $ENV{'request.state'} eq "published") {
   19:     if ( defined $ENV{'form.submit'}) {
   20:       return ('grade', 'web');
   21:     } else {
   22:       return ('web');
   23:     }
   24:   } elsif ($ENV{'request.state'} eq "construct") {
   25:     if ( defined $ENV{'form.preview'}) {
   26:       if ( defined $ENV{'form.submit'}) {
   27: 	return ('grade', 'web');
   28:       } else {
   29: 	return ('web');
   30:       }
   31:     } else {
   32:       #return ('edit');
   33:       #edit is currently broken
   34:       return ('web');
   35:     }
   36:   }
   37:   return ();
   38: }
   39: 
   40: sub setup_vars {
   41:   my ($target) = @_;
   42:   return ';'
   43: #  return ';$external::target='.$target.';';
   44: }
   45: 
   46: sub send_header {
   47:   my ($request)= @_;
   48:   $request->print(&Apache::lontexconvert::header());
   49:   $ENV{'request.uri'}=$request->uri;
   50: #  $request->print('<form name='.$ENV{'form.request.prefix'}.'lonhomework method="POST" action="'.$request->uri.'">');
   51: }
   52: 
   53: sub send_footer {
   54:   my ($request)= @_;
   55: #  $request->print('</form>');
   56:   $request->print(&Apache::lontexconvert::footer());
   57: }
   58: 
   59: #@Apache::lonhomework::date_status=();
   60: #@Apache::lonhomework::date_msg=();
   61: sub check_date {
   62:   my ($id) = @_;
   63:   my $date ='';
   64:   my $status = '';
   65:   my $datemsg = '';
   66:   my $lastdate = '';
   67:   my $temp;
   68:   my $type;
   69:   my $passed;
   70:   &Apache::lonxml::debug("checking for part :$id:");
   71:   foreach $temp ("opendate","duedate","answerdate") {
   72:     $lastdate = $date;
   73:     $date = &Apache::lonnet::EXT("resource.$id.$temp");
   74:     &Apache::lonxml::debug("found :$date: for :$temp:");
   75:     if ($date eq '') {
   76:       $date = "an unknown date"; $passed = 0;
   77:     } else {
   78:       if (time < $date) { $passed = 0; } else { $passed = 1; }
   79:       $date = localtime $date;
   80:     }
   81:     if (!$passed) { $type=$temp; last; }
   82:   }
   83:   &Apache::lonxml::debug("have :$type:$passed:");
   84:   if ($passed) {
   85:     $status='SHOW_ANSWER';
   86:     $datemsg=$date;
   87:   } elsif ($type eq 'opendate') {
   88:     $status='CLOSED';
   89:     $datemsg = "will open on $date";
   90:   } elsif ($type eq 'duedate') {
   91:     $status='CAN_ANSWER';
   92:     $datemsg = "is due at $date";
   93:   } elsif ($type eq 'answerdate') {
   94:     $status='CLOSED';
   95:     $datemsg = "was due as $lastdate, and answers will be available at $date";
   96:   }
   97:   if ($status eq 'CAN_ANSWER') {
   98:     #check #tries
   99:     my $tries = $Apache::lonhomework::history{"resource.$id.tries"};
  100:     my $maxtries = &Apache::lonnet::EXT("resource.$id.maxtries");
  101:     if ( $tries eq '' ) { $tries = '0'; }
  102:     if ( $maxtries eq '' ) { $maxtries = '2'; } 
  103:     if ($tries >= $maxtries) { $status = 'CANNOT_ANSWER'; } 
  104:   }
  105:   &Apache::lonxml::debug("sending back :$status:$datemsg:");
  106:   if ($ENV{'request.state'} eq "construct") {
  107:     &Apache::lonxml::debug("in construction ignoring dates");
  108:     $status='CAN_ANSWER';
  109:     $datemsg='is in under construction';
  110:   }
  111:   return ($status,$datemsg);
  112: }
  113: 
  114: sub handler {
  115:   my $request=$_[0];
  116: 
  117:   if ( $ENV{'user.name'} eq 'albertel' ) { $Apache::lonxml::debug=1; }
  118:   
  119:   my (@targets) = &get_target();
  120: 
  121:   if ($ENV{'browser.mathml'}) {
  122:     $request->content_type('text/xml');
  123:   } else {
  124:     $request->content_type('text/html');
  125:   }
  126:   $request->send_http_header;
  127:   return OK if $request->header_only;
  128:   
  129:   &Apache::lonhomework::send_header($request);
  130:   
  131:   #check if allowed to see
  132:   
  133:   foreach my $target (@targets) {
  134:     my $file=&Apache::lonnet::filelocation("",$request->uri);
  135:     my $problem=&Apache::lonnet::getfile($file);
  136:     if ($problem == -1) {
  137:       &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
  138:       $problem='';
  139:     }
  140:     
  141:     my %mystyle;
  142:     my $result = '';
  143:     &Apache::inputtags::initialize_inputtags;
  144:     %Apache::lonhomework::results=();
  145:     %Apache::lonhomework::history=&Apache::lonnet::restore;
  146:     #ignore error conditions
  147:     my ($temp)=keys %Apache::lonhomework::history ;
  148:     if ($temp =~ m/^error:.*/) { %Apache::lonhomework::history=(); } 
  149:     if ($target eq 'web' && &Apache::lonnet::symbread() eq '') {
  150:       $request->print("Vieiwing this problem as not a student, submissions will be ignored.");
  151:     }
  152:     if ($target eq 'grade') {
  153:       my $resultkey;
  154:       foreach $resultkey (sort keys %Apache::lonhomework::history) {
  155: 	&Apache::lonxml::debug("$resultkey ---- $Apache::lonhomework::history{$resultkey}");
  156:       }
  157:       &Apache::lonxml::debug("\n<br>restored values^</br>\n");
  158:     }
  159:     my $default=&Apache::lonnet::getfile('/home/httpd/html/res/adm/includes/default_homework.lcpm');
  160:     if ($default == -1) {
  161:       &Apache::lonxml::error("<b>Unable to find <i>default_homework.lcpm</i></b>");
  162:       $default='';
  163:     }
  164:     $result = &Apache::lonxml::xmlparse($target, $problem,
  165: 			$default.&setup_vars($target),%mystyle);
  166: 
  167:     #$request->print("Result follows:");
  168:     $request->print($result);
  169:     #$request->print(":Result ends");
  170:     if ($target eq 'grade') {
  171: 
  172:       my $resultkey;
  173:       foreach $resultkey (sort keys %Apache::lonhomework::results) {
  174: 	&Apache::lonxml::debug("$resultkey ---- $Apache::lonhomework::results{$resultkey}");
  175:       }
  176:       &Apache::lonxml::debug("\n<br>storing values^</br>\n");
  177:     }
  178:     
  179:     my ($temp) = keys %Apache::lonhomework::results;
  180:     if ( $temp ne '' ) {
  181:       &Apache::lonxml::debug("Store return message:".&Apache::lonnet::cstore(%Apache::lonhomework::results));
  182:     }
  183:   }
  184:   &Apache::lonhomework::send_footer($request);
  185:   
  186:   return OK;
  187: 
  188: }
  189: 
  190: 1;
  191: __END__