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Up to [LON-CAPA] / loncom / homework

- if uploaded filetypes isn't set can upload any file
- added a lot of debuggin info
- actaully compiles now
- wroks correctly in the null case
- add non-fuctional submissions buttons to improve the look of grade mode
- if no user to grade don't show criteria

    1: # The LearningOnline Network with CAPA 
    2: # definition of tags that give a structure to a document
    3: #
    4: # $Id: bridgetask.pm,v 1.15 2005/05/03 05:31:51 albertel Exp $
    5: #
    6: # Copyright Michigan State University Board of Trustees
    7: #
    8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
    9: #
   10: # LON-CAPA is free software; you can redistribute it and/or modify
   11: # it under the terms of the GNU General Public License as published by
   12: # the Free Software Foundation; either version 2 of the License, or
   13: # (at your option) any later version.
   14: #
   15: # LON-CAPA is distributed in the hope that it will be useful,
   16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
   17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   18: # GNU General Public License for more details.
   19: #
   20: # You should have received a copy of the GNU General Public License
   21: # along with LON-CAPA; if not, write to the Free Software
   22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   23: #
   24: # /home/httpd/html/adm/gpl.txt
   25: #
   26: # http://www.lon-capa.org/
   27: #
   28: ###
   29: 
   30: 
   31: package Apache::bridgetask; 
   32: 
   33: use strict;
   34: use Apache::lonnet;
   35: use Apache::File();
   36: use Apache::lonmenu;
   37: use Apache::lonlocal;
   38: use Apache::lonxml;
   39: use Time::HiRes qw( gettimeofday tv_interval );
   40: 
   41: BEGIN {
   42:     &Apache::lonxml::register('Apache::bridgetask',('Task','IntroParagraph','Dimension','Instance','InstanceText','Criteria','ClosingParagraph'));
   43: }
   44: 
   45: sub initialize_bridgetask {
   46:     # id of current Dimension, 0 means that no dimension is current 
   47:     # (inside <Task> only)
   48:     $Apache::bridgetask::dimension='';
   49:     # list of all Dimension ids seen
   50:     @Apache::bridgetask::dimensionlist=();
   51:     # list of all current Instance ids
   52:     @Apache::bridgetask::instance=();
   53:     # list of all Instance ids seen in this problem
   54:     @Apache::bridgetask::instancelist=();
   55:     # key of queud user data that we are currently grading
   56:     $Apache::bridgetask::queue_key='';
   57: }
   58: 
   59: sub proctor_check_auth {
   60:     my ($slot)=@_;
   61:     my $user=$env{'form.proctorname'};
   62:     my $domain=$env{'form.proctordomain'};
   63:     
   64:     my @allowed=split(",",$slot->{'proctor'});
   65:     foreach my $possible (@allowed) {
   66: 	my ($puser,$pdom)=(split('@',$possible));
   67: 	if ($puser eq $user && $pdom eq $domain) {
   68: 	    my $authhost=&Apache::lonnet::authenticate($puser,$env{'form.proctorpassword'},$pdom);
   69: 	    if ($authhost ne 'no_host') {
   70: 		$Apache::lonhomework::results{'resource.checkedin'}=
   71: 		    $user.'@'.$domain;
   72: 		return 1;
   73: 	    }
   74: 	}
   75:     }
   76:     return 0;
   77: }
   78: 
   79: sub add_previous_version_button {
   80:     my $result;
   81:     $result.=&mt(' Show a previously done version: [_1]','<select name="previousversion">
   82: <option>Pick one</option>
   83: </select>');
   84:     return $result;
   85: }
   86: 
   87: sub add_grading_button {
   88:     my $result;
   89:     $result.=' <input type="submit" name="gradeasubmission" value="'.
   90: 	&mt("Get a submission to grade").'" />';
   91:     $result.='<input type="hidden" name="grade_target" value="webgrade" />';
   92:     return $result;
   93: }
   94: 
   95: sub start_Task {
   96:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
   97: 
   98:     &Apache::structuretags::initialize_storage();
   99:     &Apache::lonhomework::showhash(%Apache::lonhomework::history);
  100:     my ($status,$accessmsg,$slot);
  101:     $Apache::lonhomework::parsing_a_task=1;
  102:     #should get back a <html> or the neccesary stuff to start XML/MathML
  103:     my ($result,$head_tag_start,$body_tag_start,$form_tag_start)=
  104: 	&Apache::structuretags::page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
  105: 
  106:     if ($target eq 'web') {
  107: 	$body_tag_start.=&add_previous_version_button();
  108: 	if ($Apache::lonhomework::modifygrades) {
  109: 	    $body_tag_start.='<form name="gradesubmission" method="POST" action="';
  110: 	    my $uri=$env{'request.uri'};
  111: 	    if ($env{'request.enc'}) { $uri=&Apache::lonenc::encrypted($uri); }
  112: 	    $body_tag_start.=$uri.'">'.&add_grading_button()."</form>";
  113: 	}
  114:     }
  115:     if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' ||
  116: 	$target eq 'tex') {
  117: 	($status,$accessmsg,my $slot_name,$slot) = 
  118: 	    &Apache::lonhomework::check_task_access('0');
  119: 	push(@Apache::inputtags::status,$status);
  120: 	$Apache::inputtags::slot_name=$slot_name;
  121: 	my $expression='$external::datestatus="'.$status.'";';
  122: 	$expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.0.solved"}.'";';
  123: 	&Apache::run::run($expression,$safeeval);
  124: 	&Apache::lonxml::debug("Got $status");
  125: 	if (( $status eq 'CLOSED' ) ||
  126: 	    ( $status eq 'BANNED') ||
  127: 	    ( $status eq 'UNAVAILABLE') ||
  128: 	    ( $status eq 'NOT_IN_A_SLOT') ||
  129: 	    ( $status eq 'NEEDS_CHECKIN') ||
  130: 	    ( $status eq 'INVALID_ACCESS')) {
  131: 	    my $bodytext=&Apache::lonxml::get_all_text("/task",$parser);
  132: 	    if ( $target eq "web" ) {
  133: 		$result.= $head_tag_start.'</head>'.$body_tag_start;
  134: 		my $msg;
  135: 		if ($status eq 'UNAVAILABLE') {
  136: 		    $msg.='<h1>'.&mt('Unable to determine if this resource is open due to network problems. Please try again later.').'</h1>';
  137: 		} elsif ($status eq 'NOT_IN_A_SLOT') {
  138: 		    $msg.='<h1>'.&mt('You are not currently signed up to work at this time and/or place.').'</h1>';
  139: 		} elsif ($status eq 'NEEDS_CHECKIN') {
  140: 		    $msg.='<h1>'.&mt('You need the Proctor to validate you.').
  141: 			'</h1>'.&proctor_validation_screen($slot);
  142: 		} elsif ($status ne 'NOT_YET_VIEWED') {
  143: 		    $msg.='<h1>'.&mt('Not open to be viewed').'</h1>';
  144: 		}
  145: 		if ($status eq 'CLOSED' || $status eq 'INVALID_ACCESS') {
  146: 		    $msg.='The problem '.$accessmsg;
  147: 		}
  148: 		$result.=$msg.'<br />';
  149: 	    } elsif ($target eq 'tex') {
  150: 		$result.='\begin{document}\noindent \vskip 1 mm  \begin{minipage}{\textwidth}\vskip 0 mm';
  151: 		if ($status eq 'UNAVAILABLE') {
  152: 		    $result.=&mt('Unable to determine if this resource is open due to network problems. Please try again later.').'\vskip 0 mm ';
  153: 		} else {
  154: 		    $result.=&mt('Problem is not open to be viewed. It')." $accessmsg \\vskip 0 mm ";
  155: 		}
  156: 	    } elsif ($target eq 'grade') {
  157: 		if ($status eq 'NEEDS_CHECKIN') {
  158: 		    if (&proctor_check_auth($slot)) {
  159: 			#FIXME immeadiatly add this to the grading queue
  160:                         #      with slot->{'endtime'} for when grading can 
  161:                         #      begin on this resource
  162:  		    }
  163: 		}
  164: 	    }
  165: 	} elsif ($target eq 'web') {
  166: 	    my $name= &Apache::structuretags::get_resource_name($parstack,$safeeval);
  167: 	    $result.="$head_tag_start<title>$name</title></head>
  168:               $body_tag_start \n $form_tag_start".	
  169: 	      '<input type="hidden" name="submitted" value="yes" />';
  170: 	    # if we are viewing someone else preserve that info
  171: 	    if (defined $env{'form.grade_symb'}) {
  172: 		foreach my $field ('symb','courseid','domain','username') {
  173: 		    $result .= '<input type="hidden" name="grade_'.$field.
  174: 			'" value="'.$env{"form.grade_$field"}.'" />'."\n";
  175: 		}
  176: 	    }
  177: 	}
  178:     } elsif ($target eq 'webgrade') {
  179: 	$result.=$head_tag_start.$body_tag_start.$form_tag_start;
  180: 	$result.=&show_queue();
  181: 	my $todo=&get_from_queue();
  182: 	if ($todo) {
  183: 	    my ($symb,$uname,$udom)=&decode_queue_key($todo);
  184: 	    $result.="\n".'<table><tr><td>Found'.
  185: 		$symb.':'.$uname.':'.$udom.'</td></tr></table>';
  186: 	    $result.='<input type="hidden" name="gradingkey" value="'.
  187: 		&HTML::Entites::encode($todo).'" />';
  188: 	    $Apache::bridgetask::queue_key=$todo;
  189: 	} else {
  190: 	    $result.="\n".
  191: 		'<table><tr><td>No user to be graded.</td></tr></table>';
  192: 	    my $bodytext=&Apache::lonxml::get_all_text("/task",$parser);
  193: 	}
  194: 	
  195:     } else {
  196: 	# page_start returned a starting result, delete it if we don't need it
  197: 	$result = '';
  198:     }
  199:     return $result;
  200: }
  201: 
  202: sub end_Task {
  203:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
  204:     my $result='';
  205:     my $status=$Apache::inputtags::status['-1'];
  206:     if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' ||
  207: 	$target eq 'tex') {
  208: 	if (
  209: 	    (($target eq 'web') && ($env{'request.state'} ne 'construct')) ||
  210: 	    ($target eq 'answer') || ($target eq 'tex')
  211: 	   ) {
  212: 	    if ($target eq 'web') {
  213: 		if ($status eq 'CAN_ANSWER') {
  214: 		    $result.="\n".'<table border="1">'.
  215: 			&Apache::inputtags::file_selector('0',"bridgetask","*",
  216: 							  'portfolioonly').
  217: 							  "</table>";
  218: 		    $result.=&Apache::inputtags::gradestatus('0');
  219: 		}
  220: 	    } 
  221: 	    if ($target eq 'web' || $target eq 'webgrade') {
  222: 		$result.=&Apache::lonxml::xmlend().'</html>';
  223: 	    }
  224: 	}
  225: 	if ($target eq 'grade') {
  226: 	    my $award='SUBMITTED';
  227: 	    &Apache::essayresponse::file_submission('0','bridgetask','portfiles',\$award);
  228: 	    if ($award eq 'SUBMITTED' &&
  229: 		$Apache::lonhomework::results{"resource.0.bridgetask.portfiles"}) {
  230: 		$Apache::lonhomework::results{"resource.0.tries"}=
  231: 		    1+$Apache::lonhomework::history{"resource.0.tries"};
  232: 	    }
  233: 	    $Apache::lonhomework::results{"resource.0.award"}=$award;
  234: 	    &Apache::lonhomework::showhash(%Apache::lonhomework::results);
  235: 	    &Apache::structuretags::finalize_storage();
  236: 	    if ($award eq 'SUBMITTED') {
  237: 		&add_to_queue();
  238: 	    }
  239: 	}
  240:     } elsif ($target eq 'webgrade') {
  241: 	$result.="\n<hr />";
  242: 	$result.='<input type="submit" name="next" value="'.
  243: 	    &mt('Save & Next').'" /> ';
  244: 	$result.='<input type="submit" name="end" value="'.
  245: 	    &mt('Save & Stop Grading').'" /> ';
  246: 	$result.='<input type="submit" name="end" value="'.
  247: 	    &mt('Throw Away & Stop Grading').'" /> ';
  248: 	$result.='</form>'.&Apache::loncommon::endbodytag().'</html>';
  249:     } elsif ($target eq 'meta') {
  250: 	$result.='<parameter part="0" package="Task"></parameter>'."\n";
  251: 	#$result.=&Apache::response::meta_part_order();
  252: 	#$result.=&Apache::response::meta_response_order();
  253:     }
  254:     undef($Apache::lonhomework::parsing_a_task);
  255:     return $result;
  256: }
  257: 
  258: sub add_to_queue {
  259:     my ($symb,$cid,$udom,$uname)=&Apache::lonxml::whichuser();
  260:     my $cnum=$env{'course.'.$cid.'.num'};
  261:     my $cdom=$env{'course.'.$cid.'.domain'};
  262:     my %data;
  263:     #$data{"$symb\0timestamp"}=time;
  264:     $data{"$symb\0queue\0$uname\@$udom"}=[$Apache::inputtags::slot_name];
  265:     &Apache::lonnet::put('gradingqueue',\%data,$cdom,$cnum);
  266: }
  267: 
  268: sub show_queue {
  269:     my $result;
  270:     my ($symb,$cid,$udom,$uname)=&Apache::lonxml::whichuser();
  271:     my $cnum=$env{'course.'.$cid.'.num'};
  272:     my $cdom=$env{'course.'.$cid.'.domain'};
  273:     my $regexp="^$symb\0queue";
  274:     my %queue=&Apache::lonnet::dump('gradingqueue',$cdom,$cnum,$regexp);
  275:     $result.="\n<h3>Current Queue</h3><table><tr><th>resource</th><th>user</th><th>Time available for grading</th></tr>";
  276:     foreach my $key (sort(keys(%queue))) {
  277: 	my ($symb,undef,$user) = split("\0",$key);
  278: 	my ($uname,$udom) = split('@',$user);
  279: 	my $title=&Apache::lonnet::gettitle($symb);
  280: 	$result.="<tr><td>$title</td><td>$uname</td><td>";
  281: 	my $slot=$queue{$key}->[0];
  282: 	my %slot_data=&Apache::lonnet::get_slot($slot);
  283: 	$result.="End time: ".&Apache::lonlocal::locallocaltime($slot_data{'endtime'})."</td></tr>";
  284:     }
  285:     $result.="</table><hr />\n";
  286:     return $result;
  287: }
  288: 
  289: sub decode_queue_key {
  290:     my ($key)=@_;
  291:     my ($symb,undef,$user) = split("\0",$key);
  292:     my ($uname,$udom) = split('@',$user);
  293:     return ($symb,$uname,$udom);
  294: }
  295: 
  296: sub queue_key_locked {
  297:     my ($key,$cdom,$cnum)=@_;
  298:     my ($key_locked,$value)=
  299: 	&Apache::lonnet::get('gradingqueue',["$key\0locked"],$cdom,$cnum);
  300:     if ($key_locked eq "$key\0locked") {
  301: 	return $value;
  302:     }
  303:     return undef;
  304: }
  305: 
  306: sub pick_from_queue_data {
  307:     my ($check_section,$queue,$cdom,$cnum)=@_;
  308:     foreach my $key (sort(keys(%$queue))) {
  309: 	my ($symb,$uname,$udom)=&decode_queue_key($key);
  310: 	if ($check_section) {
  311: 	    my $section=&Apache::lonnet::getsection($uname,$udom);
  312: 	    if ($section ne $check_section) {
  313: 		&Apache::lonnet::logthis("not my sec");
  314: 		next;
  315: 	    }
  316: 	}
  317: 	my $slot=$queue->{$key}[0];
  318: 	my %slot_data=&Apache::lonnet::get_slot($slot);
  319: 	if ($slot_data{'endtime'} > time) { 
  320: 	    &Apache::lonnet::logthis("not time");
  321: 	    next;
  322: 	}
  323: 	if (&queue_key_locked($key,$cdom,$cnum)) {
  324: 	    &Apache::lonnet::logthis("someone already has um.");
  325: 	    next;
  326: 	}
  327: 	return $key;
  328:     }
  329:     return undef;
  330: }
  331: 
  332: sub find_mid_grade {
  333:     my ($symb,$cdom,$cnum)=@_;
  334:     my $todo=$env{'form.gradingkey'};
  335:     my $me=$env{'user.name'}.'@'.$env{'user.domain'};
  336:     if ($todo) {
  337: 	my $who=&queue_key_locked($todo,$cdom,$cnum);
  338: 	if ($who eq $me) { return $todo; }
  339:     }
  340:     my $regexp="^$symb\0.*\0locked\$";
  341:     my %locks=&Apache::lonnet::dump('gradingqueue',$cdom,$cnum,$regexp);
  342:     foreach my $key (keys(%locks)) {
  343: 	my $who=$locks{$key};
  344: 	if ($who eq $me) {
  345: 	    $todo=$key;
  346: 	    $todo=~s/\0locked$//;
  347: 	    return $todo;
  348: 	}
  349:     }
  350:     return undef;
  351: }
  352: 
  353: sub get_from_queue {
  354:     my $result;
  355:     my ($symb,$cid,$udom,$uname)=&Apache::lonxml::whichuser();
  356:     my $cnum=$env{'course.'.$cid.'.num'};
  357:     my $cdom=$env{'course.'.$cid.'.domain'};
  358:     my $todo;
  359:     # FIXME need to find if I am 'mid grading'
  360:     $todo=&find_mid_grade($symb,$cdom,$cnum);
  361:     &Apache::lonnet::logthis("found ".join(':',&decode_queue_key($todo)));
  362:     while (1) {
  363: 	my $starttime=time;
  364: 	&Apache::lonnet::put('gradingqueue',{"$symb\0timestamp"=>$starttime},
  365: 			     $cdom,$cnum);
  366: 	&Apache::lonnet::logthis("$starttime");
  367: 	my $regexp="^$symb\0queue\0";
  368: 	my %queue=&Apache::lonnet::dump('gradingqueue',$cdom,$cnum,$regexp);
  369: 	#make a pass looking for a user in my section
  370: 	if ($env{'request.course.sec'}) {
  371: 	    &Apache::lonnet::logthis("sce");
  372: 	    $todo=&pick_from_queue_data($env{'request.course.sec'},\%queue,
  373: 					$cdom,$cnum);
  374: 	    &Apache::lonnet::logthis("sce $todo");
  375: 	}
  376: 	# no one in our section so look for any user that is ready for grading
  377: 	if (!$todo) {
  378: 	    &Apache::lonnet::logthis("no sce");
  379: 	    $todo=&pick_from_queue_data($env{'request.course.sec'},\%queue,
  380: 					$cdom,$cnum);
  381: 	    &Apache::lonnet::logthis("no sce $todo");
  382: 	}
  383: 	# no user to grade 
  384: 	if (!$todo) { last; }
  385: 	&Apache::lonnet::logthis("got $todo");
  386: 	# otherwise found someone so lets try to lock them
  387: 	my $success=&Apache::lonnet::newput('gradingqueue',
  388: 					    {"$todo\0locked"=>
  389: 						 $env{'user.name'}.'@'.$env{'user.domain'}},
  390: 					   $cdom,$cnum);
  391: 	# someone else already picked them
  392: 	&Apache::lonnet::logthis("success $todo");
  393: 	if ($success ne 'ok') { next; }
  394: 	my (undef,$endtime)=
  395: 	    &Apache::lonnet::get('gradingqueue',["$symb\0timestamp"],
  396: 				 $cdom,$cnum);
  397: 	&Apache::lonnet::logthis("emd  $endtime");
  398: 	# someone else already modified the queue, 
  399: 	# perhaps our picked user wass already fully graded between
  400: 	# when we picked him and when we locked his record? so lets
  401: 	# double check.
  402: 	if ($endtime != $starttime) {
  403: 	    my ($key,$value)=
  404: 		&Apache::lonnet::get('gradingqueue',["$todo"],
  405: 				     $cdom,$cnum);
  406: 	    &Apache::lonnet::logthis("check  $key .. $value");
  407: 	    if ($key eq $todo && ref($value)) {
  408: 	    } else {
  409: 		&Apache::lonnet::del('gradingqueue',["$todo\0locked"],
  410: 				     $cdom,$cnum);
  411: 		&Apache::lonnet::logthis("del");
  412: 		next;
  413: 	    }
  414: 	}
  415: 	&Apache::lonnet::logthis("last $todo");
  416: 	last;
  417:     }
  418:     return $todo;
  419: }
  420: 
  421: sub start_ClosingParagraph {
  422:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
  423:     my $result;
  424:     if ($target eq 'web') {
  425:     } elsif ($target eq 'webgrade') {
  426: 	&Apache::lonxml::startredirection();
  427:     }
  428:     return $result;
  429: }
  430: 
  431: sub end_ClosingParagraph {
  432:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
  433:     my $result;
  434:     if ($target eq 'web') {
  435:     } elsif ($target eq 'webgrade') {
  436: 	&Apache::lonxml::endredirection();
  437:     }
  438:     return $result;
  439: }
  440: 
  441: my %dimension;
  442: sub start_Dimension {
  443:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
  444:     undef(%dimension);
  445:     my $dim_id=$Apache::lonxml::curdepth;
  446:     $Apache::bridgetask::dimension=$dim_id;
  447:     push(@Apache::bridgetask::dimensionlist,$dim_id);
  448:     undef(@Apache::bridgetask::instance);
  449:     return '';
  450: }
  451: 
  452: sub get_instance {
  453:     #FIXME just grabbing the first one for now, need
  454:     #to randomly pick one until all have been seen
  455:     #then start repicking
  456:     &Apache::response::pushrandomnumber();
  457:     my @order=&Math::Random::random_permutation(@{$dimension{'instances'}});
  458:     return $order[0];
  459: }
  460: 
  461: sub end_Dimension {
  462:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
  463:     my $result;
  464:     if ($target eq 'web') {
  465: 	my $instance=&get_instance();
  466: 	$result=$dimension{'intro'}.$dimension{$instance.'.text'};
  467:     } elsif ($target eq 'webgrade') {
  468: 	my $instance=&get_instance();
  469: 	$result.="\n".'<table>';
  470: 	foreach my $id (@{$dimension{$instance.'.criterias'}}) {
  471: 	    $result.='<tr><td>'.
  472: 		$dimension{$instance.'.criteria.'.$id}.'</td></tr>';
  473: 	}
  474: 	$result.='</table>';
  475:     }
  476:     return $result;
  477: }
  478: 
  479: sub start_IntroParagraph {
  480:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
  481:     my $result;
  482:     if ($target eq 'web' || $target eq 'webgrade') {
  483: 	if ($tagstack->[-2] eq 'Dimension' || $target eq 'webgrade') {
  484: 	    &Apache::lonxml::startredirection();
  485: 	}
  486:     }
  487:     return $result;
  488: }
  489: 
  490: sub end_IntroParagraph {
  491:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
  492:     my $result;
  493:     if ($target eq 'web' || $target eq 'webgrade') {
  494: 	if ($tagstack->[-2] eq 'Dimension' || $target eq 'webgrade') {
  495: 	    $dimension{'intro'}=&Apache::lonxml::endredirection();
  496: 	}
  497:     }
  498:     return $result;
  499: }
  500: 
  501: sub start_Instance {
  502:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
  503:     push(@{$dimension{'instances'}},$Apache::lonxml::curdepth);
  504:     push(@Apache::bridgetask::instance,$Apache::lonxml::curdepth);
  505:     push(@Apache::bridgetask::instancelist,$Apache::lonxml::curdepth);
  506:     return '';
  507: }
  508: 
  509: sub end_Instance {
  510:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
  511:     return '';
  512: }
  513: 
  514: sub start_InstanceText {
  515:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
  516:     if ($target eq 'web' || $target eq 'webgrade') {
  517: 	&Apache::lonxml::startredirection();
  518:     }
  519:     return '';
  520: }
  521: 
  522: sub end_InstanceText {
  523:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
  524:     my $instance_id=$Apache::bridgetask::instance[-1];
  525:     if ($target eq 'web' || $target eq 'webgrade') {
  526: 	$dimension{$instance_id.'.text'}=&Apache::lonxml::endredirection();
  527:     }
  528:     return '';
  529: }
  530: 
  531: sub start_Criteria {
  532:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
  533:     if ($target eq 'web' || $target eq 'webgrade') {
  534: 	&Apache::lonxml::startredirection();
  535:     }
  536:     return '';
  537: }
  538: 
  539: sub end_Criteria {
  540:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
  541:     my $instance_id=$Apache::bridgetask::instance[-1];
  542:     if ($target eq 'web' || $target eq 'webgrade') {
  543: 	my $criteria=&Apache::lonxml::endredirection();
  544: 	my $id=$Apache::lonxml::curdepth;
  545: 	$dimension{$instance_id.'.criteria.'.$id}=$criteria;
  546: 	push(@{$dimension{$instance_id.'.criterias'}},$id);
  547:     }
  548:     return '';
  549: }
  550: 
  551: sub proctor_validation_screen {
  552:     my ($slot) = @_;
  553:     my (undef,undef,$domain,$user) = &Apache::lonxml::whichuser();
  554:     my $url=&Apache::lonnet::studentphoto($domain,$user,'jpg');
  555:     $user=$env{'form.proctorname'};
  556:     if ($env{'form.proctordomain'}) { $domain=$env{'form.proctordomain'}; }
  557:     my $msg;
  558:     if ($env{'form.proctorpassword'}) {
  559: 	$msg='<p><font color="red">'.&mt("Failed to authenticate the proctor.")
  560: 	    .'</font></p>';
  561:     }
  562:     my $result= (<<ENDCHECKOUT);
  563: <h2>Proctor Validation</h2>
  564:     <p>Your room's proctor needs to validate your access to this resource.</p>
  565:     $msg
  566: <form name="checkout" method="POST" action="$env{'request.uri'}">
  567: <input type="hidden" name="validate" value="yes" />
  568: <input type="hidden" name="submitted" value="yes" />
  569: <table>
  570:   <tr><td>Proctor's Username:</td><td><input type="string" name="proctorname" value="$user" /></td></tr>
  571:   <tr><td>Password:</td><td><input type="password" name="proctorpassword" value="" /></td></tr>
  572:   <tr><td>Proctor's Domain:</td><td><input type="string" name="proctordomain" value="$domain" /></td></tr>
  573: </table>
  574: <input type="submit" name="checkoutbutton" value="Validate"  /><br />
  575: Student who should be logged in is:<br />
  576: <img src="$url" /><br />
  577: </form>
  578: ENDCHECKOUT
  579:     return $result;
  580: }
  581: 
  582: 1;
  583: __END__