Return to lonhomework.pm CVS log

Up to [LON-CAPA] / loncom / homework

- reorginizing things to improve the interface to editing a problem/ starting a problem/ viewing a problem in construction space

    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::outputtags;
   16: use Apache::Constants qw(:common);
   17: 
   18: sub get_target {
   19:   if ( $ENV{'request.state'} eq "published") {
   20:     if ( defined $ENV{'form.submitted'}) {
   21:       return ('grade', 'web');
   22:     } else {
   23:       return ('web');
   24:     }
   25:   } elsif ($ENV{'request.state'} eq "construct") {
   26:     if ( defined $ENV{'form.preview'}) {
   27:       if ( defined $ENV{'form.submitted'}) {
   28: 	return ('grade', 'web');
   29:       } else {
   30: 	return ('web');
   31:       }
   32:     } else {
   33:       return ('grade','web');
   34:       if ( $ENV{'form.submitted'} eq 'edit' ) {
   35: 	return ('modified','edit');
   36:       } else {
   37: 	return ('edit');
   38:       }
   39:     }
   40:   }
   41:   return ();
   42: }
   43: 
   44: sub setup_vars {
   45:   my ($target) = @_;
   46:   return ';'
   47: #  return ';$external::target='.$target.';';
   48: }
   49: 
   50: sub send_header {
   51:   my ($request)= @_;
   52:   $request->print(&Apache::lontexconvert::header());
   53:   $ENV{'request.uri'}=$request->uri;
   54: #  $request->print('<form name='.$ENV{'form.request.prefix'}.'lonhomework method="POST" action="'.$request->uri.'">');
   55: }
   56: 
   57: sub createmenu {
   58:   my ($which,$request)=@_;
   59:   if ($which eq 'grade') {
   60:     $request->print('<script language="JavaScript"> 
   61:           hwkmenu=window.open("/res/adm/pages/homeworkmenu.html","homeworkremote",
   62:                  "height=350,width=150,menubar=no");
   63:           </script>');
   64:   }
   65: }
   66: 
   67: sub send_footer {
   68:   my ($request)= @_;
   69: #  $request->print('</form>');
   70:   $request->print(&Apache::lontexconvert::footer());
   71: }
   72: 
   73: $Apache::lonxml::browse='';
   74: sub check_date {
   75:   my ($id) = @_;
   76:   my $date ='';
   77:   my $status = '';
   78:   my $datemsg = '';
   79:   my $lastdate = '';
   80:   my $temp;
   81:   my $type;
   82:   my $passed;
   83:   &Apache::lonxml::debug("checking for part :$id:");
   84:   foreach $temp ("opendate","duedate","answerdate") {
   85:     $lastdate = $date;
   86:     $date = &Apache::lonnet::EXT("resource.$id.$temp");
   87:     &Apache::lonxml::debug("found :$date: for :$temp:");
   88:     if ($date eq '') {
   89:       $date = "an unknown date"; $passed = 0;
   90:     } elsif ($date eq 'con_lost') {
   91:       $date = "an indeterminate date"; $passed = 0;
   92:     } else {
   93:       if (time < $date) { $passed = 0; } else { $passed = 1; }
   94:       $date = localtime $date;
   95:     }
   96:     if (!$passed) { $type=$temp; last; }
   97:   }
   98:   &Apache::lonxml::debug("have :$type:$passed:");
   99:   if ($passed) {
  100:     $status='SHOW_ANSWER';
  101:     $datemsg=$date;
  102:   } elsif ($type eq 'opendate') {
  103:     $status='CLOSED';
  104:     $datemsg = "will open on $date";
  105:   } elsif ($type eq 'duedate') {
  106:     $status='CAN_ANSWER';
  107:     $datemsg = "is due at $date";
  108:   } elsif ($type eq 'answerdate') {
  109:     $status='CLOSED';
  110:     $datemsg = "was due on $lastdate, and answers will be available on $date";
  111:   }
  112:   if ($status eq 'CAN_ANSWER') {
  113:     #check #tries
  114:     my $tries = $Apache::lonhomework::history{"resource.$id.tries"};
  115:     my $maxtries = &Apache::lonnet::EXT("resource.$id.maxtries");
  116:     if ( $tries eq '' ) { $tries = '0'; }
  117:     if ( $maxtries eq '' ) { $maxtries = '2'; } 
  118:     if ($tries >= $maxtries) { $status = 'CANNOT_ANSWER'; } 
  119:   }
  120:   &Apache::lonxml::debug("sending back :$status:$datemsg:");
  121:   if (($Apache::lonhomework::browse eq 'F') && ($status eq 'CLOSED')) {
  122:     &Apache::lonxml::debug("should be allowed to browse a resource when closed");
  123:     $status='CAN_ANSWER';
  124:     $datemsg='is closed but you are allowed to view it';
  125:   }
  126:   if ($ENV{'request.state'} eq "construct") {
  127:     &Apache::lonxml::debug("in construction ignoring dates");
  128:     $status='CAN_ANSWER';
  129:     $datemsg='is in under construction';
  130:   }
  131:   return ($status,$datemsg);
  132: }
  133: 
  134: sub showhash {
  135:   my (%hash) = @_;
  136:   my $resultkey;
  137:   foreach $resultkey (sort keys %hash) {
  138:     &Apache::lonxml::debug("$resultkey ---- $hash{$resultkey}");
  139:   }
  140:   &Apache::lonxml::debug("\n<br />restored values^</br>\n");
  141:   return '';
  142: }
  143: 
  144: sub setuppermissions {
  145:   $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
  146:   $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
  147:   return ''
  148: }
  149: 
  150: sub setupheader {
  151:   my $request=$_[0];
  152:   if ($ENV{'browser.mathml'}) {
  153:     $request->content_type('text/xml');
  154:   } else {
  155:     $request->content_type('text/html');
  156:   }
  157:   $request->send_http_header;
  158:   return OK if $request->header_only;
  159:   &Apache::lonhomework::send_header($request);
  160:   return ''
  161: }
  162: 
  163: sub renderpage {
  164:   my ($request,$file) = @_;
  165: 
  166:   my (@targets) = &get_target();
  167:   foreach my $target (@targets) {
  168:     my $problem=&Apache::lonnet::getfile($file);
  169:     if ($problem == -1) {
  170:       &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
  171:       $problem='';
  172:     }
  173: 
  174:     my %mystyle;
  175:     my $result = '';
  176:     &Apache::inputtags::initialize_inputtags;
  177:     %Apache::lonhomework::results=();
  178:     %Apache::lonhomework::history=&Apache::lonnet::restore();
  179:     #ignore error conditions
  180:     my ($temp)=keys %Apache::lonhomework::history ;
  181:     if ($temp =~ m/^error:.*/) { %Apache::lonhomework::history=(); } 
  182:     if ($target eq 'web') {
  183:       if (&Apache::lonnet::symbread() eq '') {
  184: 	if ($ENV{'request.state'} eq "construct") {
  185: 	  $request->print("In construction space, submissions ignored<br />");
  186: 	} else {
  187: 	  $request->print("Browsing or <a href=\"/adm/ambiguous\">ambiguous</a> reference, submissions ignored<br />");
  188: 	}
  189:       }
  190:       if ($Apache::lonhomework::viewgrades eq 'F') {&createmenu('grade',$request); }
  191:     }
  192:     if ($target eq 'grade') { &showhash(%Apache::lonhomework::history); }
  193: 
  194:     my $default=&Apache::lonnet::getfile('/home/httpd/html/res/adm/includes/default_homework.lcpm');
  195:     if ($default == -1) {
  196:       &Apache::lonxml::error("<b>Unable to find <i>default_homework.lcpm</i></b>");
  197:       $default='';
  198:     }
  199:     $result = &Apache::lonxml::xmlparse($target, $problem,
  200: 			$default.&setup_vars($target),%mystyle);
  201: 
  202:     #$request->print("Result follows:");
  203:     if ($target eq 'modified') {
  204:       my $fileout = &Apache::lonnet::filelocation("",$request->uri);
  205:       my $filesave=$fileout.".bak";
  206: 
  207:       my $fs=Apache::File->new(">$filesave");
  208:       print $fs $problem;
  209:       $request->print("<b>Making Backup to $filesave</b><br />");
  210: 
  211:       my $fh=Apache::File->new(">$fileout");
  212:       print $fh $result;
  213:       $request->print("<b>Saving Modifications to $fileout</b><br />");
  214:     } else {
  215:       $request->print($result);
  216:     }
  217:     #$request->print(":Result ends");
  218:     if ($target eq 'grade') { &showhash(%Apache::lonhomework::results); }
  219: 
  220:     #store new values
  221:     my ($temp) = keys %Apache::lonhomework::results;
  222:     if ( $temp ne '' ) {
  223:       &Apache::lonxml::debug("Store return message:".
  224: 			     &Apache::lonnet::cstore(\%Apache::lonhomework::results));
  225:     }
  226:   }
  227: }
  228: 
  229: sub handler {
  230:   my $request=$_[0];
  231: 
  232:   if ( $ENV{'user.name'} eq 'albertel' ) {$Apache::lonxml::debug=1;}
  233: 
  234:   if (&setupheader($request)) { return OK; }
  235: 
  236:   #setup permissions
  237:   $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
  238:   $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
  239:   &Apache::lonxml::debug("Permissions:$Apache::lonhomework::browse:$Apache::lonhomework::viewgrades:");
  240: 
  241:   my $file=&Apache::lonnet::filelocation("",$request->uri);
  242: 
  243:   #check if we know where we are
  244:   if ($ENV{'request.course.fn'} && !&Apache::lonnet::symbread()) { 
  245:     # if we are browsing we might not be able to know where we are
  246:     if ($Apache::lonhomework::browse ne 'F') {
  247:       #should know where we are, so ask
  248:       $request->internal_redirect('/adm/ambiguous'); return;
  249:     }
  250:   }
  251: 
  252:   if ($ENV{'request.state'} eq "construct") {
  253:     if ( -e $file ) {
  254:       if (!(defined $ENV{'form.showproblem'})) {
  255: 	#first visit to problem in construction space
  256: 	&view_or_edit_menu($request);
  257:       } else {
  258: 	&renderpage($request,$file);
  259:       }
  260:     } else {
  261:       # requested file doesn't exist in contruction space
  262:       &newproblem($request);
  263:     }
  264:   } else {
  265:     # just render the page normally outside of construction space
  266:     &renderpage($request,$file);
  267:   }
  268: 
  269:   &Apache::lonhomework::send_footer($request);
  270:   # always turn off debug messages
  271:   $Apache::lonxml::debug=0;
  272:   return OK;
  273: 
  274: }
  275: 
  276: 1;
  277: __END__