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    1: # The LearningOnline Network with CAPA
    2: # The LON-CAPA Homework handler
    3: #
    4: # $Id: lonhomework.pm,v 1.158 2003/12/08 20:33:30 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: # Guy Albertelli
   29: # 11/30 Gerd Kortemeyer
   30: # 6/1,8/17,8/18 Gerd Kortemeyer
   31: # 7/18 Jeremy Bowers
   32: 
   33: package Apache::lonhomework;
   34: use strict;
   35: use Apache::style();
   36: use Apache::lonxml();
   37: use Apache::lonnet();
   38: use Apache::lonplot();
   39: use Apache::inputtags();
   40: use Apache::structuretags();
   41: use Apache::randomlabel();
   42: use Apache::response();
   43: use Apache::hint();
   44: use Apache::outputtags();
   45: use Apache::caparesponse();
   46: use Apache::radiobuttonresponse();
   47: use Apache::optionresponse();
   48: use Apache::imageresponse();
   49: use Apache::essayresponse();
   50: use Apache::externalresponse();
   51: use Apache::rankresponse();
   52: use Apache::matchresponse();
   53: use Apache::chemresponse();
   54: use Apache::Constants qw(:common);
   55: use HTML::Entities();
   56: use Apache::loncommon();
   57: use Apache::lonlocal;
   58: #use Time::HiRes qw( gettimeofday tv_interval );
   59: 
   60: BEGIN {
   61:     &Apache::lonxml::register_insert();
   62: }
   63: 
   64: sub get_target {
   65:     if (($ENV{'request.state'} eq "published") ||
   66: 	($ENV{'request.state'} eq "uploaded")) {
   67: 	if ( defined($ENV{'form.grade_target'}  ) 
   68: 	     && ($ENV{'form.grade_target'} eq 'tex')) {
   69: 	    return ($ENV{'form.grade_target'});
   70: 	} elsif ( defined($ENV{'form.grade_target'}  ) 
   71: 		  && ($Apache::lonhomework::viewgrades eq 'F' )) {
   72: 	    return ($ENV{'form.grade_target'});
   73: 	}
   74: 
   75: 	if ( defined($ENV{'form.submitted'}) &&
   76: 	     ( !defined($ENV{'form.resetdata'})) &&
   77: 	     ( !defined($ENV{'form.newrandomization'}))) {
   78: 	    return ('grade', 'web');
   79: 	} else {
   80: 	    return ('web');
   81: 	}
   82:     } elsif ($ENV{'request.state'} eq "construct") {
   83: 	if ( defined($ENV{'form.grade_target'}) ) {
   84: 	    return ($ENV{'form.grade_target'});
   85: 	}
   86: 	if ( defined($ENV{'form.preview'})) {
   87: 	    if ( defined($ENV{'form.submitted'})) {
   88: 		return ('grade', 'web');
   89: 	    } else {
   90: 		return ('web');
   91: 	    }
   92: 	} else {
   93: 	    if ( $ENV{'form.problemmode'} eq &mt('View') ||
   94: 		 $ENV{'form.problemmode'} eq &mt('Discard Edits and View')) {
   95: 		if ( defined($ENV{'form.submitted'}) &&
   96: 		     (!defined($ENV{'form.resetdata'})) &&
   97: 		     (!defined($ENV{'form.newrandomization'}))) {
   98: 		    return ('grade', 'web','answer');
   99: 		} else {
  100: 		    return ('web','answer');
  101: 		}
  102: 	    } elsif ( $ENV{'form.problemmode'} eq &mt('Edit') ) {
  103: 		if ( $ENV{'form.submitted'} eq 'edit' ) {
  104: 		    if ( $ENV{'form.submit'} eq &mt('Submit Changes and View') ) {
  105: 			return ('modified','web','answer');
  106: 		    } else {
  107: 			return ('modified','edit');
  108: 		    }
  109: 		} else {
  110: 		    return ('edit');
  111: 		}
  112: 	    } else {
  113: 		return ('web');
  114: 	    }
  115: 	}
  116:     }
  117:     return ();
  118: }
  119: 
  120: sub setup_vars {
  121:     my ($target) = @_;
  122:     return ';'
  123: #  return ';$external::target='.$target.';';
  124: }
  125: 
  126: sub send_header {
  127:     my ($request)= @_;
  128:     $request->print(&Apache::lontexconvert::header());
  129: #  $request->print('<form name='.$ENV{'form.request.prefix'}.'lonhomework method="POST" action="'.$request->uri.'">');
  130: }
  131: 
  132: sub createmenu {
  133:     my ($which,$request)=@_;
  134:     if ($which eq 'grade') {
  135: 	$request->print('<script language="JavaScript"> 
  136:           hwkmenu=window.open("/res/adm/pages/homeworkmenu.html","homeworkremote",
  137:                  "height=350,width=150,menubar=no");
  138:           </script>');
  139:     }
  140: }
  141: 
  142: sub send_footer {
  143:     my ($request)= @_;
  144: #  $request->print('</form>');
  145:     $request->print(&Apache::lontexconvert::footer());
  146: }
  147: 
  148: $Apache::lonxml::browse='';
  149: 
  150: sub check_ip_acc {
  151:     my ($acc)=@_;
  152:     if (!defined($acc) || $acc =~ /^\s*$/) { return 1; }
  153:     my $allowed=0;
  154:     my $ip=$ENV{'REMOTE_ADDR'};
  155:     my $name;
  156:     foreach my $pattern (split(',',$acc)) {
  157: 	if ($pattern =~ /\*$/) {
  158: 	    #35.8.*
  159: 	    $pattern=~s/\*//;
  160: 	    if ($ip =~ /^\Q$pattern\E/) { $allowed=1; }
  161: 	} elsif ($pattern =~ /(\d+\.\d+\.\d+)\.\[(\d+)-(\d+)\]$/) {    
  162: 	    #35.8.3.[34-56]
  163: 	    my $low=$2;
  164: 	    my $high=$3;
  165: 	    $pattern=$1;
  166: 	    if ($ip =~ /^\Q$pattern\E/) { 
  167: 		my $last=(split(/\./,$ip))[3];
  168: 		if ($last <=$high && $last >=$low) { $allowed=1; }
  169: 	    }
  170: 	} elsif ($pattern =~ /^\*/) {
  171: 	    #*.msu.edu
  172: 	    $pattern=~s/\*//;
  173: 	    if (!defined($name)) {
  174: 		use Socket;
  175: 		my $netaddr=inet_aton($ip);
  176: 		($name)=gethostbyaddr($netaddr,AF_INET);
  177: 	    }
  178: 	    if ($name =~ /\Q$pattern\E$/i) { $allowed=1; }
  179: 	} elsif ($pattern =~ /\d+\.\d+\.\d+\.\d+/) {
  180: 	    #127.0.0.1
  181: 	    if ($ip =~ /^\Q$pattern\E/) { $allowed=1; }
  182: 	} else {
  183: 	    #some.name.com
  184: 	    if (!defined($name)) {
  185: 		use Socket;
  186: 		my $netaddr=inet_aton($ip);
  187: 		($name)=gethostbyaddr($netaddr,AF_INET);
  188: 	    }
  189: 	    if ($name =~ /\Q$pattern\E$/i) { $allowed=1; }
  190: 	}
  191: 	if ($allowed) { last; }
  192:     }
  193:     return $allowed;
  194: }
  195: # JB, 9/24/2002: Any changes in this function may require a change
  196: # in lonnavmaps::resource::getDateStatus.
  197: sub check_access {
  198:     my ($id) = @_;
  199:     my $date ='';
  200:     my $status;
  201:     my $datemsg = '';
  202:     my $lastdate = '';
  203:     my $temp;
  204:     my $type;
  205:     my $passed;
  206: 
  207:     if ($ENV{'request.state'} eq "construct") {
  208: 	&Apache::lonxml::debug("in construction ignoring dates");
  209: 	$status='CAN_ANSWER';
  210: 	$datemsg=&mt('is in under construction');
  211: 	return ($status,$datemsg);
  212:     }
  213: 
  214:     &Apache::lonxml::debug("checking for part :$id:");
  215:     &Apache::lonxml::debug("time:".time);
  216:     
  217:     my $allowed=&check_ip_acc(&Apache::lonnet::EXT("resource.$id.acc"));
  218:     if (!$allowed) {
  219: 	$status='INVALID_ACCESS';
  220: 	$date=&mt("can not be accessed from your location.");
  221: 	return($status,$date);
  222:     }
  223: 
  224:     foreach $temp ("opendate","duedate","answerdate") {
  225: 	$lastdate = $date;
  226: 	$date = &Apache::lonnet::EXT("resource.$id.$temp");
  227: 	my $thistype = &Apache::lonnet::EXT("resource.$id.$temp.type");
  228: 	if ($thistype =~ /^(con_lost|no_such_host)/ ||
  229: 	    $date     =~ /^(con_lost|no_such_host)/) {
  230: 	    $status='UNAVAILABLE';
  231: 	    $date=&mt("may open later.");
  232: 	    return($status,$date);
  233: 	}
  234: 	if ($thistype eq 'date_interval') {
  235: 	    if ($temp eq 'opendate') {
  236: 		$date=&Apache::lonnet::EXT("resource.$id.duedate")-$date;
  237: 	    }
  238: 	    if ($temp eq 'answerdate') {
  239: 		$date=&Apache::lonnet::EXT("resource.$id.duedate")+$date;
  240: 	    }
  241: 	}
  242: 	&Apache::lonxml::debug("found :$date: for :$temp:");
  243: 	if ($date eq '') {
  244: 	    $date = &mt("an unknown date"); $passed = 0;
  245: 	} elsif ($date eq 'con_lost') {
  246: 	    $date = &mt("an indeterminate date"); $passed = 0;
  247: 	} else {
  248: 	    if (time < $date) { $passed = 0; } else { $passed = 1; }
  249: 	    $date = localtime $date;
  250: 	}
  251: 	if (!$passed) { $type=$temp; last; }
  252:     }
  253:     &Apache::lonxml::debug("have :$type:$passed:");
  254:     if ($passed) {
  255: 	$status='SHOW_ANSWER';
  256: 	$datemsg=$date;
  257:     } elsif ($type eq 'opendate') {
  258: 	$status='CLOSED';
  259: 	$datemsg = &mt("will open on")." $date";
  260:     } elsif ($type eq 'duedate') {
  261: 	$status='CAN_ANSWER';
  262: 	$datemsg = &mt("is due at")." $date";
  263:     } elsif ($type eq 'answerdate') {
  264: 	$status='CLOSED';
  265: 	$datemsg = &mt("was due on")." $lastdate".&mt(", and answers will be available on")." $date";
  266:     }
  267:     if ($status eq 'CAN_ANSWER') {
  268: 	#check #tries, and if correct.
  269: 	my $tries = $Apache::lonhomework::history{"resource.$id.tries"};
  270: 	my $maxtries = &Apache::lonnet::EXT("resource.$id.maxtries");
  271: 	if ( $tries eq '' ) { $tries = '0'; }
  272: 	if ( $maxtries eq '' ) { $maxtries = '2'; } 
  273: 	if ($tries >= $maxtries) { $status = 'CANNOT_ANSWER'; }
  274: 	# if (correct and show prob status) or excused then CANNOT_ANSWER
  275: 	if(($Apache::lonhomework::history{"resource.$id.solved"}=~/^correct/
  276: 	    &&
  277: 	    lc($Apache::lonhomework::problemstatus) ne 'no')
  278: 	   ||
  279: 	   $Apache::lonhomework::history{"resource.$id.solved"}=~/^excused/) {
  280: 	    $status = 'CANNOT_ANSWER';
  281: 	}
  282:     }
  283: 
  284:   #if (($status ne 'CLOSED') && ($Apache::lonhomework::type eq 'exam') &&
  285:   #    (!$Apache::lonhomework::history{"resource.0.outtoken"})) {
  286:   #    return ('UNCHECKEDOUT','needs to be checked out');
  287:   #}
  288: 
  289: 
  290:     &Apache::lonxml::debug("sending back :$status:$datemsg:");
  291:     if (($Apache::lonhomework::browse eq 'F') && ($status eq 'CLOSED')) {
  292: 	&Apache::lonxml::debug("should be allowed to browse a resource when closed");
  293: 	$status='CAN_ANSWER';
  294: 	$datemsg=&mt('is closed but you are allowed to view it');
  295:     }
  296: 
  297:     return ($status,$datemsg);
  298: }
  299: 
  300: sub showhash {
  301:     my (%hash) = @_;
  302:     &showhashsubset(\%hash,'.');
  303:     return '';
  304: }
  305: 
  306: sub showarray {
  307:     my ($array)=@_;
  308:     my $string="(";
  309:     foreach my $elm (@{ $array }) {
  310: 	if (ref($elm)) {
  311: 	    if ($elm =~ /ARRAY/ ) {
  312: 		$string.=&showarray($elm);
  313: 	    }
  314: 	} else {
  315: 	    $string.="$elm,"
  316: 	}
  317:     }
  318:     chop($string);
  319:     $string.=")";
  320:     return $string;
  321: }
  322: 
  323: sub showhashsubset {
  324:     my ($hash,$keyre) = @_;
  325:     my $resultkey;
  326:     foreach $resultkey (sort keys %$hash) {
  327: 	if ($resultkey =~ /$keyre/) {
  328: 	    if (ref($$hash{$resultkey})) {
  329: 		if ($$hash{$resultkey} =~ /ARRAY/ ) {
  330: 		    &Apache::lonxml::debug("$resultkey ---- ".
  331: 					   &showarray($$hash{$resultkey}));
  332: 		} elsif ($$hash{$resultkey} =~ /HASH/ ) {
  333: 		    &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
  334: 		    &showhashsubset($$hash{$resultkey},'.');
  335: 		} else {
  336: 		    &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
  337: 		}
  338: 	    } else {
  339: 		&Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
  340: 	    }
  341: 	}
  342:     }
  343:     &Apache::lonxml::debug("\n<br />restored values^</br>\n");
  344:     return '';
  345: }
  346: 
  347: sub setuppermissions {
  348:     $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
  349:     my $viewgrades = &Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
  350:     if (! $viewgrades && 
  351: 	exists($ENV{'request.course.sec'}) && 
  352: 	$ENV{'request.course.sec'} !~ /^\s*$/) {
  353: 	$viewgrades = &Apache::lonnet::allowed('vgr',$ENV{'request.course.id'}.
  354:                                                '/'.$ENV{'request.course.sec'});
  355:     }
  356:     $Apache::lonhomework::viewgrades = $viewgrades;
  357:     return ''
  358: }
  359: 
  360: sub setupheader {
  361:     my $request=$_[0];
  362:     if ($ENV{'browser.mathml'}) {
  363: 	&Apache::loncommon::content_type($request,'text/xml');
  364:     } else {
  365: 	&Apache::loncommon::content_type($request,'text/html');
  366:     }
  367:     if (!$Apache::lonxml::debug && ($ENV{'REQUEST_METHOD'} eq 'GET')) {
  368: 	&Apache::loncommon::no_cache($request);
  369:     }
  370:     $request->send_http_header;
  371:     return OK if $request->header_only;
  372:     return ''
  373: }
  374: 
  375: sub handle_save_or_undo {
  376:     my ($request,$problem,$result) = @_;
  377:     my $file    = &Apache::lonnet::filelocation("",$request->uri);
  378:     my $filebak =$file.".bak";
  379:     my $filetmp =$file.".tmp";
  380:     my $error=0;
  381: 
  382:     &Apache::lonnet::correct_line_ends($result);
  383: 
  384:     if ($ENV{'form.Undo'} eq &mt('undo')) {
  385: 	my $error=0;
  386: 	if (!copy($file,$filetmp)) { $error=1; }
  387: 	if ((!$error) && (!copy($filebak,$file))) { $error=1; }
  388: 	if ((!$error) && (!move($filetmp,$filebak))) { $error=1; }
  389: 	if (!$error) {
  390: 	    $request->print("<p><b>".&mt("Undid changes, Switched")." $filebak ".&mt("and")." $file</b></p>");
  391: 	} else {
  392: 	    $request->print("<p><font color=\"red\" size=\"+1\"><b>".&mt("Unable to undo, unable to switch")." $filebak ".&mt("and")." $file</b></font></p>");
  393: 	    $error=1;
  394: 	}
  395:     } else {
  396: 	my $fs=Apache::File->new(">$filebak");
  397: 	if (defined($fs)) {
  398: 	    print $fs $$problem;
  399: 	    $request->print("<b>".&mt("Making Backup to").
  400: 			    " $filebak</b><br />");
  401: 	} else {
  402: 	    $request->print("<font color=\"red\" size=\"+1\"><b>".&mt("Unable to make backup")." $filebak</b></font>");
  403: 	    $error=2;
  404: 	}
  405: 	my $fh=Apache::File->new(">$file");
  406: 	if (defined($fh)) {
  407: 	    print $fh $$result;
  408: 	    $request->print("<b>".&mt("Saving Modifications to").
  409: 			    " $file</b><br />");
  410: 	} else {
  411: 	    $request->print("<font color=\"red\" size=\"+1\"><b>".
  412: 			    &mt("Unable to write to")." $file</b></font>");
  413: 	    $error|=4;
  414: 	}
  415:     }
  416:     return $error;
  417: }
  418: 
  419: sub analyze_header {
  420:     my ($request) = @_;
  421:     my $result.='<html>
  422:             <head><title>'.&mt("Analyzing a problem").'</title></head>
  423:             <body bgcolor="#FFFFFF">
  424:             <form name="lonhomework" method="POST" action="'.
  425: 	    $ENV{'request.uri'}.'">
  426:             <input type="submit" name="problemmode" value="'.&mt("EditXML").'" />
  427:             <input type="submit" name="problemmode" value="'.&mt('Edit').'" />
  428:             <hr />
  429:             <input type="submit" name="submit" value="'.&mt("View").'" />
  430:             <hr />
  431:             '.&mt('List of possible answers').':
  432:             </form>';
  433:     $request->print($result);
  434:     $request->rflush();
  435: }
  436: 
  437: sub analyze_footer {
  438:     my ($request) = @_;
  439:     my $result='</body></html>';
  440:     $request->print($result);
  441:     $request->rflush();
  442: }
  443: 
  444: sub analyze {
  445:     my ($request,$file) = @_;
  446:     &Apache::lonxml::debug("Analyze");
  447:     my $result;
  448:     my %overall;
  449:     my %allparts;
  450:     my $rndseed=$ENV{'form.rndseed'};
  451:     &analyze_header($request);
  452:     my %prog_state=
  453: 	&Apache::lonhtmlcommon::Create_PrgWin($request,&mt('Analyze Progress'),
  454: 					      &mt('Getting Problem Variants'),
  455: 					      $ENV{'form.numtoanalyze'});
  456:     for(my $i=1;$i<$ENV{'form.numtoanalyze'}+1;$i++) {
  457: 	&Apache::lonhtmlcommon::Increment_PrgWin($request,\%prog_state,
  458: 						 &mt('last problem'));
  459: 	my $subresult=&Apache::lonnet::ssi($request->uri,
  460: 					   ('grade_target' => 'analyze'),
  461: 					   ('rndseed' => $i+$rndseed));
  462: 	(my $garbage,$subresult)=split(/_HASH_REF__/,$subresult,2);
  463: 	my %analyze=&Apache::lonnet::str2hash($subresult);
  464: 	my @parts;
  465: 	if (defined(@{ $analyze{'parts'} })) {
  466: 	    @parts=@{ $analyze{'parts'} };
  467: 	}
  468: 	foreach my $part (@parts) {
  469: 	    if (!exists($allparts{$part})) {$allparts{$part}=1;};
  470: 	    if ($analyze{$part.'.type'} eq 'numericalresponse'	||
  471: 		$analyze{$part.'.type'} eq 'stringresponse'	||
  472: 		$analyze{$part.'.type'} eq 'formularesponse'   ) {
  473: 		push( @{ $overall{$part.'.answer'} },
  474: 		      [@{ $analyze{$part.'.answer'} }]);
  475: 	    }
  476: 	}
  477:     }
  478:     &Apache::lonhtmlcommon::Update_PrgWin($request,\%prog_state,
  479: 					  &mt('Analyzing Results'));
  480:     foreach my $part (sort(keys(%allparts))) {
  481: 	if (defined(@{ $overall{$part.'.answer'} })) {
  482: 	    my $num_cols=scalar(@{ $overall{$part.'.answer'}->[0] });
  483: 	    $request->print('<table><tr><td colspan="'.($num_cols+1).'">'.&mt('Part').' '.$part.'</td></tr>');
  484: 	    my %frequency;
  485: 	    foreach my $answer (sort {$a->[0] <=> $b->[0]} (@{ $overall{$part.'.answer'} })) {
  486: 		$frequency{join("\0",@{ $answer })}++;
  487: 	    }
  488: 	    $request->print('<tr><td colspan="'.($num_cols).'">'.&mt('Answer').'</td><td>'.&mt('Frequency').'</td></tr>');
  489: 	    foreach my $answer (sort {(split("\0",$a))[0] <=> (split("\0",$b))[0]} (keys(%frequency))) {
  490: 		$request->print('<tr><td align="right">'.
  491: 				join('</td><td align="right">',split("\0",$answer)).
  492: 				'</td><td>('.$frequency{$answer}.
  493: 				')</td></tr>');
  494: 	    }
  495: 	    $request->print('</table>');
  496: 	} else {
  497: 	    $request->print('<p>'.&mt('Part').' '.$part.' '.
  498: 			    &mt('is not analyzable at this time').'</p>');
  499: 	}
  500:     }
  501:     if (scalar(keys(%allparts)) == 0 ) {
  502: 	$request->print('<p>'.&mt('Found no analyzable parts in this problem, currently only Numerical, Formula and String response styles are supported.').'</p>');
  503:     }
  504:     &Apache::lonhtmlcommon::Close_PrgWin($request,\%prog_state);
  505:     &analyze_footer($request);
  506:     &Apache::lonhomework::showhash(%overall);
  507:     return $result;
  508: }
  509: 
  510: sub editxmlmode {
  511:     my ($request,$file) = @_;
  512:     my $result;
  513:     my $problem=&Apache::lonnet::getfile($file);
  514:     if ($problem eq -1) {
  515: 	&Apache::lonxml::error("<b> ".&mt('Unable to find').
  516: 			       " <i>$file</i></b>");
  517: 	$problem='';
  518:     }
  519:     if (defined($ENV{'form.editxmltext'}) || defined($ENV{'form.Undo'})) {
  520: 	my $error=&handle_save_or_undo($request,\$problem,
  521: 				       \$ENV{'form.editxmltext'});
  522: 	if (!$error) { $problem=&Apache::lonnet::getfile($file); }
  523:     }
  524:     &Apache::lonhomework::showhashsubset(\%ENV,'^form');
  525:     if ( $ENV{'form.submit'} eq &mt('Submit Changes and View') ) {
  526: 	&Apache::lonhomework::showhashsubset(\%ENV,'^form');
  527: 	$ENV{'form.problemmode'}='View';
  528: 	&renderpage($request,$file);
  529:     } else {
  530: 	my ($rows,$cols) = &Apache::edit::textarea_sizes(\$problem);
  531: 	my $xml_help = Apache::loncommon::helpLatexCheatsheet("Problem_Editor_XML_Index",
  532: 							      "Problem Editing Help");
  533: 	if ($cols > 80) { $cols = 80; }
  534: 	if ($cols < 70) { $cols = 70; }
  535: 	if ($rows < 20) { $rows = 20; }
  536: 	$result.='<html><body bgcolor="#FFFFFF">
  537:             <form name="lonhomework" method="POST" action="'.
  538: 	    $ENV{'request.uri'}.'">
  539:             <input type="hidden" name="problemmode" value="'.&mt('EditXML').'" />
  540:             <input type="submit" name="problemmode" value="'.&mt('Discard Edits and View').'" />
  541:             <input type="submit" name="problemmode" value="'.&mt('Edit').'" />
  542:             <hr />
  543:             <input type="submit" name="submit" value="'.&mt('Submit Changes').'" />
  544:             <input type="submit" name="submit" value="'.&mt('Submit Changes and View').'" />
  545:             <input type="submit" name="Undo" value="'.&mt('undo').'" />
  546:             <hr />
  547:             ' . $xml_help . '
  548:             <textarea rows="'.$rows.'" cols="'.$cols.'" name="editxmltext">'.
  549: 	    &HTML::Entities::encode($problem).'</textarea>
  550:             </form></body></html>';
  551: 	$request->print($result);
  552:     }
  553:     return '';
  554: }
  555: 
  556: sub renderpage {
  557:     my ($request,$file) = @_;
  558: 
  559:     my (@targets) = &get_target();
  560:     &Apache::lonxml::debug("Running targets ".join(':',@targets));
  561:     foreach my $target (@targets) {
  562: 	#my $t0 = [&gettimeofday()];
  563: 	my $problem=&Apache::lonnet::getfile($file);
  564: 	if ($problem eq -1) {
  565: 	    &Apache::lonxml::error("<b> ".&mt('Unable to find')." <i>$file</i></b>");
  566: 	    $problem='';
  567: 	}
  568: 
  569: 	my %mystyle;
  570: 	my $result = '';
  571: 	if ($target eq 'analyze') { %Apache::lonhomework::analyze=(); }
  572: 	if ($target eq 'answer') { &showhash(%Apache::lonhomework::history); }
  573: 	if ($target eq 'web') {&Apache::lonhomework::showhashsubset(\%ENV,'^form');}
  574: 
  575: 	&Apache::lonxml::debug("Should be parsing now");
  576: 	$result = &Apache::lonxml::xmlparse($request, $target, $problem,
  577: 					    &setup_vars($target),%mystyle);
  578: 	undef($Apache::lonhomework::parsing_a_problem);
  579: 	#$request->print("Result follows:");
  580: 	if ($target eq 'modified') {
  581: 	    &handle_save_or_undo($request,\$problem,\$result);
  582: 	} else {
  583: 	    if ($target eq 'analyze') {
  584: 		$result=&Apache::lonnet::hashref2str(\%Apache::lonhomework::analyze);
  585: 		undef(%Apache::lonhomework::analyze);
  586: 	    }
  587: 	    #my $td=&tv_interval($t0);
  588: 	    #if ( $Apache::lonxml::debug) {
  589: 	    #$result =~ s:</body>::;
  590: 	    #$result.="<br />Spent $td seconds processing target $target\n</body>";
  591: 	    #}
  592: 	    $request->print($result);
  593: 	    $request->rflush();
  594: 	}
  595: 	#$request->print(":Result ends");
  596: 	#my $td=&tv_interval($t0);
  597:     }
  598: }
  599: 
  600: # with no arg it returns a HTML <option> list of the template titles
  601: # with one arg it returns the filename associated with the arg passed
  602: sub get_template_list {
  603:     my ($namewanted,$extension) = @_;
  604:     my $result;
  605:     my @allnames;
  606:     &Apache::lonxml::debug("Looking for :$extension:");
  607:     foreach my $file (</home/httpd/html/res/adm/includes/templates/*.$extension>) {
  608: 	my $name=&Apache::lonnet::metadata($file,'title');
  609: 	if ($namewanted && ($name eq $namewanted)) {
  610: 	    $result=$file;
  611: 	    last;
  612: 	} else {
  613: 	    if ($name) { push (@allnames, $name); }
  614: 	}
  615:     }
  616:     if (@allnames && !$result) {
  617: 	$result="<option>".&mt("Select a")." $extension ".&mt('template')."</option>\n<option>".
  618: 	    join('</option><option>',sort(@allnames)).'</option>';
  619:     }
  620:     return $result;
  621: }
  622: 
  623: sub newproblem {
  624:     my ($request) = @_;
  625:     my $extension=$request->uri;
  626:     $extension=~s:^.*\.([\w]+)$:$1:;
  627:     &Apache::lonxml::debug("Looking for :$extension:");
  628:     my $templatelist=&get_template_list('',$extension);
  629:     if ($ENV{'form.template'} &&
  630: 	$ENV{'form.template'} ne "Select a $extension template") {
  631: 	use File::Copy;
  632: 	my $file = &get_template_list($ENV{'form.template'},$extension);
  633: 	my $dest = &Apache::lonnet::filelocation("",$request->uri);
  634: 	copy($file,$dest);
  635: 	&renderpage($request,$dest);
  636:     } elsif($ENV{'form.newfile'} && !$templatelist) {
  637: 	# I don't like hard-coded filenames but for now, this will work.
  638: 	use File::Copy;
  639: 	my $templatefilename =
  640: 	    $request->dir_config('lonIncludes').'/templates/blank.problem';
  641: 	&Apache::lonxml::debug("$templatefilename");
  642: 	my $dest = &Apache::lonnet::filelocation("",$request->uri);
  643: 	copy($templatefilename,$dest);
  644: 	&renderpage($request,$dest);
  645:     } else {
  646: 	my $url=$request->uri;
  647: 	my $shownurl=$url;
  648: 	$shownurl=~s-^/~-/priv/-;
  649: 	my $dest = &Apache::lonnet::filelocation("",$request->uri);
  650: 	my $errormsg;
  651: 	if ($ENV{'form.newfile'}) {
  652: 	    $errormsg='<p><font color="red">'.&mt('You did not select a template.').'</font></p>'."\n";
  653: 	}
  654: 	my $instructions;
  655: 	if ($templatelist) { $instructions=&mt(", select a template from the pull-down menu below.").'<br />'.&mt("Then");}
  656: 	my %lt=&Apache::lonlocal::texthash( 'create' => 'Creating a new',
  657: 			  'resource' => 'resource',
  658: 			  'requested' => 'The requested file',
  659: 			  'not exist' => 'currently does not exist',
  660: 			  'createnew' => 'To create a new',
  661: 			  'click' => 'click on the',
  662: 			  'Create' => 'Create',
  663: 			  'button' => 'button');
  664: 	$request->print(<<ENDNEWPROBLEM);
  665: <body bgcolor="#FFFFFF">
  666: <h1>$lt{'create'} $extension $lt{'resource'}</h1>
  667: $errormsg
  668: $lt{'requested'} <tt>$shownurl</tt> $lt{'not exist'}.
  669: <p>
  670: <b>$lt{'createnew'} $extension$instructions $lt{'click'} "$lt{'Create'} $extension" $lt{'button'}.</b>
  671: </p>
  672: <p><form action="$url" method="POST">
  673: ENDNEWPROBLEM
  674: 	if (defined($templatelist)) {
  675: 	    $request->print("<select name=\"template\">$templatelist</select>");
  676: 	}
  677: 	$request->print("<br /><input type=\"submit\" name=\"newfile\" value=\"".&mt('Create')." $extension\" />");
  678: 	$request->print("</form></p></body>");
  679:     }
  680:     return '';
  681: }
  682: 
  683: sub view_or_edit_menu {
  684:     my ($request) = @_;
  685:     my $url=$request->uri;
  686:     my %lt=&Apache::lonlocal::texthash( 'would' => 'Would you like to',
  687: 		      'view' => 'View',
  688: 		      'Edit' => 'edit',
  689: 		      'or' => 'or',
  690: 		      'the problem' => 'the problem');
  691:     $request->print(<<EDITMENU);
  692: <body bgcolor="#FFFFFF">
  693: <form action="$url" method="POST">
  694: $lt{'would'} <input type="submit" name="problemmode" value="&lt{'view'}">
  695: &lt{'or'} <input type="submit" name="problemmode" value="&lt{'Edit'}">
  696: &lt{'the problem'}.
  697: </form>
  698: </body>
  699: EDITMENU
  700: }
  701: 
  702: sub handler {
  703:     #my $t0 = [&gettimeofday()];
  704:     my $request=$_[0];
  705:     
  706:     $Apache::lonxml::debug=$ENV{'user.debug'};
  707: 
  708:     if (&setupheader($request)) { return OK; }
  709:     $ENV{'request.uri'}=$request->uri;
  710: 
  711:     #setup permissions
  712:     $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
  713:     $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
  714:     &Apache::lonxml::debug("Permissions:$Apache::lonhomework::browse:$Apache::lonhomework::viewgrades:");
  715:     # some times multiple problemmodes are submitted, need to select
  716:     # the last one
  717:     &Apache::lonxml::debug("Problem Mode ".$ENV{'form.problemmode'});
  718:     if ( defined($ENV{'form.problemmode'}) &&
  719: 	 ref($ENV{'form.problemmode'}) ) {
  720: 	&Apache::lonxml::debug("Problem Mode ".join(",",@$ENV{'form.problemmode'}));
  721: 	my $mode=$ENV{'form.problemmode'}->[-1];
  722: 	undef $ENV{'form.problemmode'};
  723: 	$ENV{'form.problemmode'}=$mode;
  724:     }
  725:     &Apache::lonxml::debug("Problem Mode ".$ENV{'form.problemmode'});
  726:     my $file=&Apache::lonnet::filelocation("",$request->uri);
  727: 
  728:     #check if we know where we are
  729:     if ($ENV{'request.course.fn'} && !&Apache::lonnet::symbread()) { 
  730: 	# if we are browsing we might not be able to know where we are
  731: 	if ($Apache::lonhomework::browse ne 'F') {
  732: 	    #should know where we are, so ask
  733: 	    if ( &Apache::lonnet::mod_perl_version() == 2 ) {
  734: 		&Apache::lonnet::cleanenv();
  735: 	    }
  736: 	    $request->internal_redirect('/adm/ambiguous'); return;
  737: 	}
  738:     }
  739: 
  740:     my ($symb) = &Apache::lonxml::whichuser();
  741:     &Apache::lonxml::debug('symb is '.$symb);
  742:     if ($ENV{'request.state'} eq "construct" || $symb eq '') {
  743: 	if ($ENV{'form.resetdata'} eq &mt('Reset Submissions') ||
  744: 	    $ENV{'form.resetdata'} eq &mt('New Problem Variation') ||
  745: 	    $ENV{'form.newrandomization'} eq &mt('New Randomization')) {
  746: 	    my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
  747: 	    &Apache::lonnet::tmpreset($symb,'',$domain,$name);
  748: 	    &Apache::lonxml::debug("Attempt reset");
  749: 	}
  750:     }
  751:     if ($ENV{'request.state'} eq "construct") {
  752: 	if ( -e $file ) {
  753: 	    &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
  754: 						    ['problemmode']);
  755: 	    if (!(defined $ENV{'form.problemmode'})) {
  756: 		#first visit to problem in construction space
  757: 		#&view_or_edit_menu($request);
  758: 		$ENV{'form.problemmode'}='View';
  759: 		&renderpage($request,$file);
  760: 	    } elsif ($ENV{'form.problemmode'} eq &mt('EditXML')) {
  761: 		&editxmlmode($request,$file);
  762: 	    } elsif ($ENV{'form.problemmode'} eq &mt('Calculate answers')) {
  763: 		&analyze($request,$file);
  764: 	    } else {
  765: 		&renderpage($request,$file);
  766: 	    }
  767: 	} else {
  768: 	    # requested file doesn't exist in contruction space
  769: 	    &newproblem($request);
  770: 	}
  771:     } else {
  772: 	# just render the page normally outside of construction space
  773: 	&Apache::lonxml::debug("not construct");
  774: 	&renderpage($request,$file);
  775:     }
  776:     #my $td=&tv_interval($t0);
  777:     #&Apache::lonxml::debug("Spent $td seconds processing");
  778:     # &Apache::lonhomework::send_footer($request);
  779:     # always turn off debug messages
  780:     $Apache::lonxml::debug=0;
  781:     return OK;
  782: 
  783: }
  784: 
  785: 1;
  786: __END__