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version 1.20, 2000/12/12 22:35:52 version 1.224, 2005/11/15 18:38:47
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   # The LearningOnline Network with CAPA
 # The LON-CAPA Homework handler  # The LON-CAPA Homework handler
 # Guy Albertelli  #
 # 11/30 Gerd Kortemeyer  # $Id$
   #
   # Copyright Michigan State University Board of Trustees
   #
   # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
   #
   # LON-CAPA is free software; you can redistribute it and/or modify
   # it under the terms of the GNU General Public License as published by
   # the Free Software Foundation; either version 2 of the License, or
   # (at your option) any later version.
   #
   # LON-CAPA is distributed in the hope that it will be useful,
   # but WITHOUT ANY WARRANTY; without even the implied warranty of
   # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   # GNU General Public License for more details.
   #
   # You should have received a copy of the GNU General Public License
   # along with LON-CAPA; if not, write to the Free Software
   # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   #
   # /home/httpd/html/adm/gpl.txt
   #
   # http://www.lon-capa.org/
   
   
 package Apache::lonhomework;  package Apache::lonhomework;
 use strict;  use strict;
 use Apache::style;  use Apache::style();
 use Apache::lonxml;  use Apache::lonxml();
 use Apache::lonnet;  use Apache::lonnet;
 use Apache::inputtags;  use Apache::lonplot();
 use Apache::structuretags;  use Apache::inputtags();
 use Apache::response;  use Apache::structuretags();
   use Apache::randomlabel();
   use Apache::response();
   use Apache::hint();
   use Apache::outputtags();
   use Apache::caparesponse();
   use Apache::radiobuttonresponse();
   use Apache::optionresponse();
   use Apache::imageresponse();
   use Apache::essayresponse();
   use Apache::externalresponse();
   use Apache::rankresponse();
   use Apache::matchresponse();
   use Apache::chemresponse();
   use Apache::drawimage();
   use Apache::Constants qw(:common);
   use HTML::Entities();
   use Apache::loncommon();
   use Apache::lonlocal;
   use Time::HiRes qw( gettimeofday tv_interval );
   use Apache::lonnet();
   
   # FIXME - improve commenting
   
   
   BEGIN {
       &Apache::lonxml::register_insert();
   }
   
   
   #
   # Decides what targets to render for.
   # Implicit inputs:
   #   Various session environment variables:
   #      request.state -  published  - is a /res/ resource
   #                       uploaded   - is a /uploaded/ resource
   #                       contruct   - is a /priv/ resource
   #      form.grade_target - a form parameter requesting a specific target
 sub get_target {  sub get_target {
   if ( $ENV{'request.state'} eq "published") {      &Apache::lonxml::debug("request.state = $env{'request.state'}");
     if ( defined $ENV{'form.submit'}) {      if( defined($env{'form.grade_target'})) {
       return ('grade', 'web');   &Apache::lonxml::debug("form.grade_target= $env{'form.grade_target'}");
     } else {  
       return ('web');  
     }  
   } elsif ($ENV{'request.state'} eq "construct") {  
     if ( defined $ENV{'form.preview'}) {  
       if ( defined $ENV{'form.submit'}) {  
  return ('grade', 'web');  
       } else {  
  return ('web');  
       }  
     } else {      } else {
       return ('edit');   &Apache::lonxml::debug("form.grade_target <undefined>");
       }
       if (($env{'request.state'} eq "published") ||
    ($env{'request.state'} eq "uploaded")) {
    if ( defined($env{'form.grade_target'}  ) 
        && ($env{'form.grade_target'} eq 'tex')) {
       return ($env{'form.grade_target'});
    } elsif ( defined($env{'form.grade_target'}  ) 
     && ($Apache::lonhomework::viewgrades eq 'F' )) {
       return ($env{'form.grade_target'});
    }
    if ($env{'form.webgrade'} &&
       $Apache::lonhomework::modifygrades eq 'F') {
       return ('grade','webgrade');
    }
    if ( defined($env{'form.submitted'}) &&
        ( !defined($env{'form.resetdata'})) &&
        ( !defined($env{'form.newrandomization'}))) {
       return ('grade', 'web');
    } else {
       return ('web');
    }
       } elsif ($env{'request.state'} eq "construct") {
    if ( defined($env{'form.grade_target'}) ) {
       return ($env{'form.grade_target'});
    }
    if ( defined($env{'form.preview'})) {
       if ( defined($env{'form.submitted'})) {
    return ('grade', 'web');
       } else {
    return ('web');
       }
    } else {
       if ( $env{'form.problemmode'} eq &mt('View') ||
    $env{'form.problemmode'} eq &mt('Discard Edits and View')) {
    if ( defined($env{'form.submitted'}) &&
        (!defined($env{'form.resetdata'})) &&
        (!defined($env{'form.newrandomization'}))) {
       return ('grade', 'web','answer');
    } else {
       return ('web','answer');
    }
       } elsif ( $env{'form.problemmode'} eq &mt('Edit') ||
         $env{'form.problemmode'} eq 'Edit') {
    if ( $env{'form.submitted'} eq 'edit' ) {
       if ( $env{'form.submit'} eq &mt('Submit Changes and View') ) {
    return ('modified','web','answer');
       } else {
    return ('modified','no_output_web','edit');
       }
    } else {
       return ('no_output_web','edit');
    }
       } else {
    return ('web');
       }
    }
     }      }
   }      return ();
   return ();  
 }  }
   
 sub setup_vars {  sub setup_vars {
   my ($target) = @_;      my ($target) = @_;
   return ';'      return ';'
 #  return ';$external::target='.$target.';';  #  return ';$external::target='.$target.';';
 }  }
   
 sub send_header {  sub send_header {
   my ($request)= @_;      my ($request)= @_;
   $request->print(&Apache::lontexconvert::header());      $request->print(&Apache::lontexconvert::header());
   $ENV{'request.uri'}=$request->uri;  #  $request->print('<form name='.$env{'form.request.prefix'}.'lonhomework method="POST" action="'.$request->uri.'">');
 #  $request->print('<form name='.$ENV{'form.request.prefix'}.'lonhomework method="POST" action="'.$request->uri.'">');  }
   
   sub createmenu {
       my ($which,$request)=@_;
       if ($which eq 'grade') {
    $request->print('<script language="JavaScript"> 
             hwkmenu=window.open("/res/adm/pages/homeworkmenu.html","homeworkremote",
                    "height=350,width=150,menubar=no");
             </script>');
       }
 }  }
   
 sub send_footer {  sub send_footer {
   my ($request)= @_;      my ($request)= @_;
 #  $request->print('</form>');  #  $request->print('</form>');
   $request->print(&Apache::lontexconvert::footer());      $request->print(&Apache::lontexconvert::footer());
 }  }
   
 sub check_date {  sub proctor_checked_in {
   my ($type,$id) = @_;      my ($slot_name,$slot)=@_;
   my $date ='';      my @allowed=split(",",$slot->{'proctor'});
   my $passed = '';      my $version=$Apache::lonhomework::history{'resource.version'};
   &Apache::lonxml::debug("checking :$type: for part :$id:");      foreach my $possible (@allowed) { 
   if ($type eq 'OPEN_DATE') {   if ($Apache::lonhomework::history{"resource.$version.checkedin"} eq
     $date = &Apache::lonnet::EXT("resource.$id.opendate");      $possible &&
   } elsif ($type eq 'DUE_DATE') {      $Apache::lonhomework::history{"resource.$version.checkedin.slot"}
     $date = &Apache::lonnet::EXT("resource.$id.duedate");         eq $slot_name) {
   } elsif ($type eq 'START_DATE') {      return 1;
     $date = &Apache::lonnet::EXT("resource.$id.duedate");   }
   } else {      }
     &Apache::lonxml::error("Unknown date request $type");      return 0;
     $date = '';  
   }  
   &Apache::lonxml::debug("found :$date:");  
   if ($date eq '') {  
     $date = "an unknown date"; $passed = 0;  
   } else {  
     if (time < $date) { $passed = 0; } else { $passed = 1; }  
     $date = localtime $date;  
   }  
   &Apache::lonxml::debug("sending back :$date:$passed:");  
   return ($date,$passed);  
 }  }
   
 sub handler {  $Apache::lonxml::browse='';
   my $request=$_[0];  sub check_ip_acc {
       my ($acc)=@_;
       &Apache::lonxml::debug("acc is $acc");
       if (!defined($acc) || $acc =~ /^\s*$/ || $acc =~/^\s*no\s*$/i) { 
    return 1;
       }
       my $allowed=0;
       my $ip=$ENV{'REMOTE_ADDR'};
       my $name;
       foreach my $pattern (split(',',$acc)) {
    if ($pattern =~ /\*$/) {
       #35.8.*
       $pattern=~s/\*//;
       if ($ip =~ /^\Q$pattern\E/) { $allowed=1; }
    } elsif ($pattern =~ /(\d+\.\d+\.\d+)\.\[(\d+)-(\d+)\]$/) {    
       #35.8.3.[34-56]
       my $low=$2;
       my $high=$3;
       $pattern=$1;
       if ($ip =~ /^\Q$pattern\E/) { 
    my $last=(split(/\./,$ip))[3];
    if ($last <=$high && $last >=$low) { $allowed=1; }
       }
    } elsif ($pattern =~ /^\*/) {
       #*.msu.edu
       $pattern=~s/\*//;
       if (!defined($name)) {
    use Socket;
    my $netaddr=inet_aton($ip);
    ($name)=gethostbyaddr($netaddr,AF_INET);
       }
       if ($name =~ /\Q$pattern\E$/i) { $allowed=1; }
    } elsif ($pattern =~ /\d+\.\d+\.\d+\.\d+/) {
       #127.0.0.1
       if ($ip =~ /^\Q$pattern\E/) { $allowed=1; }
    } else {
       #some.name.com
       if (!defined($name)) {
    use Socket;
    my $netaddr=inet_aton($ip);
    ($name)=gethostbyaddr($netaddr,AF_INET);
       }
       if ($name =~ /\Q$pattern\E$/i) { $allowed=1; }
    }
    if ($allowed) { last; }
       }
       return $allowed;
   }
   
   if ( $ENV{'user.name'} eq 'albertel' ) { $Apache::lonxml::debug=1; }  sub check_task_access {
         # does it pass normal muster
   my (@targets) = &get_target();      # yes we really do want the default args passing
       my ($status,$datemsg)=&check_access;
   if ($ENV{'browser.mathml'}) {      if ($status eq 'SHOW_ANSWER' ||
     $request->content_type('text/xml');   $status eq 'CLOSED' ||
   } else {   $status eq 'CANNOT_ANSWER' ||
     $request->content_type('text/html');   $status eq 'INVALID_ACCESS' ||
   }   $status eq 'UNAVAILABLE') {
   $request->send_http_header;   return ($status,$datemsg);
   return 'OK' if $request->header_only;      }
         if ($env{'request.state'} eq "construct") {
   &Apache::lonhomework::send_header($request);   return ($status,$datemsg);
         }
   #check if allowed to see      my $version=$Apache::lonhomework::history{'resource.version'};
         if ($Apache::lonhomework::history{"resource.$version.checkedin"} &&
   foreach my $target (@targets) {   $Apache::lonhomework::history{"resource.$version.status"} eq 'pass') {
     my $file=&Apache::lonnet::filelocation("",$request->uri);   return ('SHOW_ANSWER');
     my $problem=&Apache::lonnet::getfile($file);      }
     if ($problem == -1) {      my ($id)=@_;
       &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");      my @slots=
       $problem='';   (split(':',&Apache::lonnet::EXT("resource.$id.availablestudent")),
     }   split(':',&Apache::lonnet::EXT("resource.$id.available")));
       
     my %mystyle;  #    if (!@slots) {
     my $result = '';  # return ($status,$datemsg);
     &Apache::inputtags::initialize_inputtags;  #    }
     %Apache::lonhomework::results=();      my $slotstatus='NOT_IN_A_SLOT';
     %Apache::lonhomework::history=&Apache::lonnet::restore;      my ($returned_slot,$slot_name);
     #ignore error conditions      foreach my $slot (@slots) {
     my ($temp)=keys %Apache::lonhomework::history ;   &Apache::lonxml::debug("getting $slot");
     if ($temp =~ m/^error:.*/) { %Apache::lonhomework::history=(); }    my %slot=&Apache::lonnet::get_slot($slot);
     if ($target eq 'web' && &Apache::lonnet::symbread() eq '') {   &Apache::lonhomework::showhash(%slot);
       $request->print("Vieiwing this problem as not a student, submissions will be ignored.");   if ($slot{'starttime'} < time &&
     }      $slot{'endtime'} > time &&
     if ($target eq 'grade') {      &check_ip_acc($slot{'ip'})) {
       my $resultkey;      &Apache::lonxml::debug("$slot is good");
       foreach $resultkey (sort keys %Apache::lonhomework::history) {      $slotstatus='NEEDS_CHECKIN';
  &Apache::lonxml::debug("$resultkey ---- $Apache::lonhomework::history{$resultkey}");      $returned_slot=\%slot;
       }      $slot_name=$slot;
       &Apache::lonxml::debug("\n<br>restored values^</br>\n");      last;
     }   }
     my $default=&Apache::lonnet::getfile('/home/httpd/html/res/adm/includes/default_homework.lcpm');      }
     if ($default == -1) {      if ($slotstatus eq 'NEEDS_CHECKIN' &&
       &Apache::lonxml::error("<b>Unable to find <i>default_homework.lcpm</i></b>");   &proctor_checked_in($slot_name,$returned_slot)) {
       $default='';   &Apache::lonxml::debug("protoctor checked in");
     }   $slotstatus='CAN_ANSWER';
     if ( $target eq 'grade') {       }
       $Apache::lonxml::textredirection = 0;       if ( $slotstatus eq 'NOT_IN_A_SLOT' && 
    $Apache::lonhomework::history{"resource.$version.checkedin"}) {
    if ($Apache::lonhomework::history{"resource.$version.status"} eq 'fail') {
       return ('SHOW_ANSWER');
    } else {
       return ('WAITING_FOR_GRADE');
    }
       }
       return ($slotstatus,$datemsg,$slot_name,$returned_slot);
   }
   
   # JB, 9/24/2002: Any changes in this function may require a change
   # in lonnavmaps::resource::getDateStatus.
   sub check_access {
       my ($id) = @_;
       my $date ='';
       my $status;
       my $datemsg = '';
       my $lastdate = '';
       my $temp;
       my $type;
       my $passed;
   
       if ($env{'request.state'} eq "construct") {
    if ($env{'form.problemstate'}) {
       if ($env{'form.problemstate'} =~ /^CANNOT_ANSWER/) {
    if ( ! ($env{'form.problemstate'} eq 'CANNOT_ANSWER_correct' &&
    lc($Apache::lonhomework::problemstatus) eq 'no')) {
       return ('CANNOT_ANSWER',
       &mt('is in this state due to author settings.'));
    }
       } else {
    return ($env{'form.problemstate'},
    &mt('is in this state due to author settings.'));
       }
    }
    &Apache::lonxml::debug("in construction ignoring dates");
    $status='CAN_ANSWER';
    $datemsg=&mt('is in under construction');
   # return ($status,$datemsg);
       }
   
       &Apache::lonxml::debug("checking for part :$id:");
       &Apache::lonxml::debug("time:".time);
   
       my ($symb)=&Apache::lonxml::whichuser();
       &Apache::lonxml::debug("symb:".$symb);
       #if ($env{'request.state'} ne "construct" && $symb ne '') {
       if ($env{'request.state'} ne "construct") {
    my $allowed=&check_ip_acc(&Apache::lonnet::EXT("resource.$id.acc"));
    if (!$allowed && ($Apache::lonhomework::browse ne 'F')) {
       $status='INVALID_ACCESS';
       $date=&mt("can not be accessed from your location.");
       return($status,$date);
    }
   
    foreach $temp ("opendate","duedate","answerdate") {
       $lastdate = $date;
       $date = &Apache::lonnet::EXT("resource.$id.$temp");
       my $thistype = &Apache::lonnet::EXT("resource.$id.$temp.type");
       if ($thistype =~ /^(con_lost|no_such_host)/ ||
    $date     =~ /^(con_lost|no_such_host)/) {
    $status='UNAVAILABLE';
    $date=&mt("may open later.");
    return($status,$date);
       }
       if ($thistype eq 'date_interval') {
    if ($temp eq 'opendate') {
       $date=&Apache::lonnet::EXT("resource.$id.duedate")-$date;
    }
    if ($temp eq 'answerdate') {
       $date=&Apache::lonnet::EXT("resource.$id.duedate")+$date;
    }
       }
       &Apache::lonxml::debug("found :$date: for :$temp:");
       if ($date eq '') {
    $date = &mt("an unknown date"); $passed = 0;
       } elsif ($date eq 'con_lost') {
    $date = &mt("an indeterminate date"); $passed = 0;
       } else {
    if (time < $date) { $passed = 0; } else { $passed = 1; }
    $date = localtime $date;
       }
       if (!$passed) { $type=$temp; last; }
    }
    &Apache::lonxml::debug("have :$type:$passed:");
    if ($passed) {
       $status='SHOW_ANSWER';
       $datemsg=$date;
    } elsif ($type eq 'opendate') {
       $status='CLOSED';
       $datemsg = &mt("will open on")." $date";
    } elsif ($type eq 'duedate') {
       $status='CAN_ANSWER';
       $datemsg = &mt("is due at")." $date";
    } elsif ($type eq 'answerdate') {
       $status='CLOSED';
       $datemsg = &mt("was due on")." $lastdate".&mt(", and answers will be available on")." $date";
    }
       }
       if ($status eq 'CAN_ANSWER' ||
    (($Apache::lonhomework::browse eq 'F') && ($status eq 'CLOSED'))) {
    #check #tries, and if correct.
    my $tries = $Apache::lonhomework::history{"resource.$id.tries"};
    my $maxtries = &Apache::lonnet::EXT("resource.$id.maxtries");
    if ( $tries eq '' ) { $tries = '0'; }
    if ( $maxtries eq '' && 
        $env{'request.state'} ne 'construct') { $maxtries = '2'; } 
    if ($maxtries && $tries >= $maxtries) { $status = 'CANNOT_ANSWER'; }
    # if (correct and show prob status) or excused then CANNOT_ANSWER
    if(($Apache::lonhomework::history{"resource.$id.solved"}=~/^correct/
       &&
       lc($Apache::lonhomework::problemstatus) ne 'no')
      ||
      $Apache::lonhomework::history{"resource.$id.solved"}=~/^excused/) {
       $status = 'CANNOT_ANSWER';
    }
       }
       if ($status eq 'CAN_ANSWER' || $status eq 'CANNOT_ANSWER') {
    my $interval=&Apache::lonnet::EXT("resource.$id.interval");
    &Apache::lonxml::debug("looking for interval $interval");
    if ($interval) {
       my $first_access=&Apache::lonnet::get_first_access('map');
       &Apache::lonxml::debug("looking for accesstime $first_access");
       if (!$first_access) {
    $status='NOT_YET_VIEWED';
    $datemsg=&seconds_to_human_length($interval);
       } else {
    my $newdate=localtime($first_access+$interval);
    if (time > ($first_access+$interval)) {
       $status='CLOSED';
       $datemsg = &mt("was due on")." $newdate".&mt(", and answers will be available on")." $date";
    } else {
       $datemsg = &mt("is due at")." $newdate";
    }
       }
    }
       }
     #if (($status ne 'CLOSED') && ($Apache::lonhomework::type eq 'exam') &&
     #    (!$Apache::lonhomework::history{"resource.0.outtoken"})) {
     #    return ('UNCHECKEDOUT','needs to be checked out');
     #}
   
   
       &Apache::lonxml::debug("sending back :$status:$datemsg:");
       if (($Apache::lonhomework::browse eq 'F') && ($status eq 'CLOSED')) {
    &Apache::lonxml::debug("should be allowed to browse a resource when closed");
    $status='CAN_ANSWER';
    $datemsg=&mt('is closed but you are allowed to view it');
       }
   
       return ($status,$datemsg);
   }
   
   sub seconds_to_human_length {
       my ($length)=@_;
   
       my $seconds=$length%60; $length=int($length/60);
       my $minutes=$length%60; $length=int($length/60);
       my $hours=$length%24;   $length=int($length/24);
       my $days=$length;
   
       my $timestr;
       if ($days > 0) { $timestr.=&mt('[quant,_1,day]',$days); }
       if ($hours > 0) { $timestr.=($timestr?", ":"").
     &mt('[quant,_1,hour]',$hours); }
       if ($minutes > 0) { $timestr.=($timestr?", ":"").
       &mt('[quant,_1,minute]',$minutes); }
       if ($seconds > 0) { $timestr.=($timestr?", ":"").
       &mt('[quant,_1,second]',$seconds); }
       return $timestr;
   }
   
   sub showhash {
       my (%hash) = @_;
       &showhashsubset(\%hash,'.');
       return '';
   }
   
   sub showarray {
       my ($array)=@_;
       my $string="(";
       foreach my $elm (@{ $array }) {
    if (ref($elm) eq 'ARRAY') {
       $string.=&showarray($elm);
    } elsif (ref($elm) eq 'HASH') {
       $string.= "HASH --- \n<br />";
       $string.= &showhashsubset($elm,'.');
    } else {
       $string.="$elm,"
    }
       }
       chop($string);
       $string.=")";
       return $string;
   }
   
   sub showhashsubset {
       my ($hash,$keyre) = @_;
       my $resultkey;
       foreach $resultkey (sort keys %$hash) {
    if ($resultkey !~ /$keyre/) { next; }
    if (ref($$hash{$resultkey})  eq 'ARRAY' ) {
       &Apache::lonxml::debug("$resultkey ---- ".
      &showarray($$hash{$resultkey}));
    } elsif (ref($$hash{$resultkey}) eq 'HASH' ) {
       &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
       &showhashsubset($$hash{$resultkey},'.');
    } else {
       &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
    }
       }
       &Apache::lonxml::debug("\n<br />restored values^</br>\n");
       return '';
   }
   
   sub setuppermissions {
       $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$env{'request.filename'});
       my $viewgrades = &Apache::lonnet::allowed('vgr',$env{'request.course.id'});
       if (! $viewgrades && 
    exists($env{'request.course.sec'}) && 
    $env{'request.course.sec'} !~ /^\s*$/) {
    $viewgrades = &Apache::lonnet::allowed('vgr',$env{'request.course.id'}.
                                                  '/'.$env{'request.course.sec'});
       }
       $Apache::lonhomework::viewgrades = $viewgrades; # File global variable...dirt.
       if ($Apache::lonhomework::browse eq 'F' && 
    $env{'form.devalidatecourseresdata'} eq 'on') {
    my (undef,$courseid) = &Apache::lonxml::whichuser();
    &Apache::lonnet::devalidatecourseresdata($env{"course.$courseid.num"},
         $env{"course.$courseid.domain"});
       }
       my $modifygrades = &Apache::lonnet::allowed('mgr',$env{'request.course.id'});
       if (! $modifygrades && 
    exists($env{'request.course.sec'}) && 
    $env{'request.course.sec'} !~ /^\s*$/) {
    $modifygrades = 
       &Apache::lonnet::allowed('mgr',$env{'request.course.id'}.
        '/'.$env{'request.course.sec'});
       }
       $Apache::lonhomework::modifygrades = $modifygrades;
       return '';
   }
   
   sub setupheader {
       my $request=$_[0];
       &Apache::loncommon::content_type($request,'text/html');
       if (!$Apache::lonxml::debug && ($ENV{'REQUEST_METHOD'} eq 'GET')) {
    &Apache::loncommon::no_cache($request);
       }
   #    $request->set_last_modified(&Apache::lonnet::metadata($request->uri,
   #  'lastrevisiondate'));
       $request->send_http_header;
       return OK if $request->header_only;
       return ''
   }
   
   sub handle_save_or_undo {
       my ($request,$problem,$result) = @_;
       my $file    = &Apache::lonnet::filelocation("",$request->uri);
       my $filebak =$file.".bak";
       my $filetmp =$file.".tmp";
       my $error=0;
   
       &Apache::lonnet::correct_line_ends($result);
   
       if ($env{'form.Undo'} eq &mt('undo')) {
    my $error=0;
    if (!copy($file,$filetmp)) { $error=1; }
    if ((!$error) && (!copy($filebak,$file))) { $error=1; }
    if ((!$error) && (!move($filetmp,$filebak))) { $error=1; }
    if (!$error) {
       &Apache::lonxml::info("<p><b>".&mt("Undid changes, Switched")." $filebak ".&mt("and")." $file</b></p>");
    } else {
       &Apache::lonxml::info("<p><font color=\"red\" size=\"+1\"><b>".&mt("Unable to undo, unable to switch")." $filebak ".&mt("and")." $file</b></font></p>");
       $error=1;
    }
     } else {      } else {
       $Apache::lonxml::textredirection = 1;    my $fs=Apache::File->new(">$filebak");
    if (defined($fs)) {
       print $fs $$problem;
       &Apache::lonxml::info("<b>".&mt("Making Backup to").
     " $filebak</b>");
    } else {
       &Apache::lonxml::info("<font color=\"red\" size=\"+1\"><b>".&mt("Unable to make backup")." $filebak</b></font>");
       $error=2;
    }
    my $fh=Apache::File->new(">$file");
    if (defined($fh)) {
       print $fh $$result;
       &Apache::lonxml::info("<b>".&mt("Saving Modifications to").
     " $file</b>");
    } else {
       &Apache::lonxml::info("<font color=\"red\" size=\"+1\"><b>".
     &mt("Unable to write to")." $file</b></font>");
       $error|=4;
    }
     }      }
     $result = &Apache::lonxml::xmlparse($target, $problem,      return $error;
  $default.&setup_vars($target),%mystyle);  }
   
   sub analyze_header {
       my ($request) = @_;
       my $bodytag=&Apache::loncommon::bodytag(undef,undef,undef,
       ($env{'environment.remote'} ne 'off'));
       my $html=&Apache::lonxml::xmlbegin();
       my $result.=$html.'
               <head><title>'.&mt("Analyzing a problem").'</title></head>
               '.$bodytag.&Apache::lonxml::message_location().'
               <form name="lonhomework" method="POST" action="'.
       &HTML::Entities::encode($env{'request.uri'},'<>&"').'">'.
       &Apache::structuretags::remember_problem_state().'
               <input type="submit" name="problemmode" value="'.&mt("EditXML").'" />
               <input type="submit" name="problemmode" value="'.&mt('Edit').'" />
               <hr />
               <input type="submit" name="submit" value="'.&mt("View").'" />
               <hr />
               </form>';
       &Apache::lonxml::add_messages(\$result);
       $request->print($result);
       $request->rflush();
   }
   
     #$request->print("Result follows:");  sub analyze_footer {
       my ($request) = @_;
       my $result='</body></html>';
     $request->print($result);      $request->print($result);
     #$request->print(":Result ends");      $request->rflush();
     if ($target eq 'grade') {  }
       my $resultkey;  
       foreach $resultkey (sort keys %Apache::lonhomework::results) {  sub analyze {
  &Apache::lonxml::debug("$resultkey ---- $Apache::lonhomework::results{$resultkey}");      my ($request,$file) = @_;
       }      &Apache::lonxml::debug("Analyze");
       &Apache::lonxml::debug("\n<br>storing values^</br>\n");      my $result;
     }      my %overall;
           my %seedexample;
     my ($temp) = keys %Apache::lonhomework::results;      my %allparts;
     if ( $temp ne '' ) {      my $rndseed=$env{'form.rndseed'};
       &Apache::lonxml::debug("Store return message:".&Apache::lonnet::cstore(%Apache::lonhomework::results));      &analyze_header($request);
     }      my %prog_state=
   }   &Apache::lonhtmlcommon::Create_PrgWin($request,&mt('Analyze Progress'),
   &Apache::lonhomework::send_footer($request);        &mt('Getting Problem Variants'),
           $env{'form.numtoanalyze'},
   return 'OK';        'inline',undef);
       for(my $i=1;$i<$env{'form.numtoanalyze'}+1;$i++) {
    &Apache::lonhtmlcommon::Increment_PrgWin($request,\%prog_state,
    &mt('last problem'));
    if (&Apache::loncommon::connection_aborted($request)) { return; }
           my $thisseed=$i+$rndseed;
    my $subresult=&Apache::lonnet::ssi($request->uri,
      ('grade_target' => 'analyze'),
      ('rndseed' => $thisseed));
    (my $garbage,$subresult)=split(/_HASH_REF__/,$subresult,2);
    my %analyze=&Apache::lonnet::str2hash($subresult);
    my @parts;
    if (defined(@{ $analyze{'parts'} })) {
       @parts=@{ $analyze{'parts'} };
    }
    foreach my $part (@parts) {
       if (!exists($allparts{$part})) {$allparts{$part}=1;};
       if ($analyze{$part.'.type'} eq 'numericalresponse' ||
    $analyze{$part.'.type'} eq 'stringresponse' ||
    $analyze{$part.'.type'} eq 'formularesponse'   ) {
    my $concatanswer=join("\0",@{ $analyze{$part.'.answer'} });
    if (($concatanswer eq '') || ($concatanswer=~/^\@/)) {
       @{$analyze{$part.'.answer'}}=('<font color="red">'.&mt('Error').'</font>');
    }
    push( @{ $overall{$part.'.answer'} },
         [@{ $analyze{$part.'.answer'} }]);
                   $seedexample{join("\0",@{ $analyze{$part.'.answer'}})}=$thisseed;
       }
    }
       }
       &Apache::lonhtmlcommon::Update_PrgWin($request,\%prog_state,
     &mt('Analyzing Results'));
       $request->print('<hr />'.&mt('List of possible answers').': ');
       foreach my $part (sort(keys(%allparts))) {
    if (defined(@{ $overall{$part.'.answer'} })) {
       my $num_cols=scalar(@{ $overall{$part.'.answer'}->[0] });
       $request->print('<table class="thinborder"><tr><th colspan="'.($num_cols+1).'">'.&mt('Part').' '.$part.'</th></tr>');
       my %frequency;
       foreach my $answer (sort {$a->[0] <=> $b->[0]} (@{ $overall{$part.'.answer'} })) {
    $frequency{join("\0",@{ $answer })}++;
       }
       $request->print('<tr><th colspan="'.($num_cols).'">'.&mt('Answer').'</th><th>'.&mt('Frequency').'<br />('
       .&mt('click for example').')</th></tr>');
       foreach my $answer (sort {(split("\0",$a))[0] <=> (split("\0",$b))[0]} (keys(%frequency))) {
    $request->print('<tr><td class="center">'.
    join('</td><td class="center">',split("\0",$answer)).
    '</td><td class="center"><a href="'.$request->uri.'?rndseed='.$seedexample{$answer}.'">'.$frequency{$answer}.
    '</a></td></tr>');
       }
       $request->print('</table>');
    } else {
       $request->print('<p>'.&mt('Response').' '.$part.' '.
       &mt('is not analyzable at this time').'</p>');
    }
       }
       if (scalar(keys(%allparts)) == 0 ) {
    $request->print('<p>'.&mt('Found no analyzable responses in this problem, currently only Numerical, Formula and String response styles are supported.').'</p>');
       }
       &Apache::lonhtmlcommon::Close_PrgWin($request,\%prog_state);
       &analyze_footer($request);
       &Apache::lonhomework::showhash(%overall);
       return $result;
   }
   
   sub editxmlmode {
       my ($request,$file) = @_;
       my $result;
       my $problem=&Apache::lonnet::getfile($file);
       if ($problem eq -1) {
    &Apache::lonxml::error("<b> ".&mt('Unable to find').
          " <i>$file</i></b>");
    $problem='';
       }
       if (defined($env{'form.editxmltext'}) || defined($env{'form.Undo'})) {
    my $error=&handle_save_or_undo($request,\$problem,
          \$env{'form.editxmltext'});
    if (!$error) { $problem=&Apache::lonnet::getfile($file); }
       }
       &Apache::lonhomework::showhashsubset(\%env,'^form');
       if ( $env{'form.submit'} eq &mt('Submit Changes and View') ) {
    &Apache::lonhomework::showhashsubset(\%env,'^form');
    $env{'form.problemmode'}='View';
    &renderpage($request,$file);
       } else {
    my ($rows,$cols) = &Apache::edit::textarea_sizes(\$problem);
    my $xml_help = '<table><tr><td>'.
       &Apache::loncommon::helpLatexCheatsheet("Problem_Editor_XML_Index",
       "Problem Editing Help").
       '</td><td>'.
          &Apache::loncommon::help_open_menu('',undef,undef,undef,5,'Authoring').
                   '</td></tr></table>';
    if ($cols > 80) { $cols = 80; }
    if ($cols < 70) { $cols = 70; }
    if ($rows < 20) { $rows = 20; }
    my $bodytag=&Apache::loncommon::bodytag(undef,undef,undef,
    ($env{'environment.remote'} ne 'off'));
    my $html=&Apache::lonxml::xmlbegin();
    $result.=$html.$bodytag.
       &renderpage($request,$file,['no_output_web'],1).
       &Apache::lonxml::message_location().'
               <form name="lonhomework" method="POST" action="'.
       &HTML::Entities::encode($env{'request.uri'},'<>&"').'">'.
       &Apache::structuretags::remember_problem_state().'
               <input type="hidden" name="problemmode" value="'.&mt('EditXML').'" />
               <input type="submit" name="problemmode" accesskey="d" value="'.&mt('Discard Edits and View').'" />
               <input type="submit" name="problemmode" accesskey="e" value="'.&mt('Edit').'" />
               <hr />
               <input type="submit" name="submit" accesskey="s" value="'.&mt('Submit Changes').'" />
               <input type="submit" name="submit" accesskey="v" value="'.&mt('Submit Changes and View').'" />
               <input type="submit" name="Undo" accesskey="u" value="'.&mt('undo').'" />
               <hr />
               ' . $xml_help . '
               <textarea style="width:100%" rows="'.$rows.'" cols="'.$cols.'" name="editxmltext">'.
       &HTML::Entities::encode($problem,'<>&"').'</textarea>
               </form></body></html>';
    &Apache::lonxml::add_messages(\$result);
    $request->print($result);
       }
       return '';
   }
   
   #
   #    Render the page in whatever target desired.
   #
   sub renderpage {
       my ($request,$file,$targets,$return_string) = @_;
   
       my @targets = @{$targets || [&get_target()]};
       &Apache::lonhomework::showhashsubset(\%env,'form.');
       &Apache::lonxml::debug("Running targets ".join(':',@targets));
       my $overall_result;
       foreach my $target (@targets) {
    # FIXME need to do something intelligent when a problem goes
           # from viewable to not viewable due to map conditions
    #&setuppermissions();
    #if (   $Apache::lonhomework::browse ne '2'
    #    && $Apache::lonhomework::browse ne 'F' ) {
    #    $request->print(" You most likely shouldn't see me.");
    #}
    #my $t0 = [&gettimeofday()];
    my $output=1;
    if ($target eq 'no_output_web') {
       $target = 'web'; $output=0;
    }
    my $problem=&Apache::lonnet::getfile($file);
    my $result;
    if ($problem eq -1) {
       my $filename=(split('/',$file))[-1];
       $result.="<b> ".&mt('Unable to find')." <i>$filename</i></b>";
       $problem='';
    }
   
    my %mystyle;
    if ($target eq 'analyze') { %Apache::lonhomework::analyze=(); }
    if ($target eq 'answer') { &showhash(%Apache::lonhomework::history); }
    if ($target eq 'web') {&Apache::lonhomework::showhashsubset(\%env,'^form');}
   
    &Apache::lonxml::debug("Should be parsing now");
    $result .= &Apache::lonxml::xmlparse($request, $target, $problem,
        &setup_vars($target),%mystyle);
    undef($Apache::lonhomework::parsing_a_problem);
    if (!$output) { $result = ''; }
    #$request->print("Result follows:");
    if ($target eq 'modified') {
       &handle_save_or_undo($request,\$problem,\$result);
    } else {
       if ($target eq 'analyze') {
    $result=&Apache::lonnet::hashref2str(\%Apache::lonhomework::analyze);
    undef(%Apache::lonhomework::analyze);
       }
       #my $td=&tv_interval($t0);
       #if ( $Apache::lonxml::debug) {
       #$result =~ s:</body>::;
       #$result.="<br />Spent $td seconds processing target $target\n</body>";
       #}
   #    $request->print($result);
       $overall_result.=$result;
   #    $request->rflush();
    }
    #$request->print(":Result ends");
    #my $td=&tv_interval($t0);
       }
       if (!$return_string) {
    &Apache::lonxml::add_messages(\$overall_result);
    $request->print($overall_result);   
    $request->rflush();   
       } else {
    return $overall_result;
       }
   }
   
   # with no arg it returns a HTML <option> list of the template titles
   # with one arg it returns the filename associated with the arg passed
   sub get_template_list {
       my ($namewanted,$extension) = @_;
       my $result;
       my @allnames;
       &Apache::lonxml::debug("Looking for :$extension:");
       foreach my $file (</home/httpd/html/res/adm/includes/templates/*.$extension>) {
    my $name=&Apache::lonnet::metadata($file,'title');
    if ($namewanted && ($name eq $namewanted)) {
       $result=$file;
       last;
    } else {
       if ($name) { push (@allnames, $name); }
    }
       }
       if (@allnames && !$result) {
    $result="<option>".&mt("Select a")." $extension ".&mt('template')."</option>\n<option>".
       join('</option><option>',sort(@allnames)).'</option>';
       }
       return $result;
   }
   
   sub newproblem {
       my ($request) = @_;
       my $extension=$request->uri;
       $extension=~s:^.*\.([\w]+)$:$1:;
       &Apache::lonxml::debug("Looking for :$extension:");
       my $templatelist=&get_template_list('',$extension);
       if ($env{'form.template'} &&
    $env{'form.template'} ne "Select a $extension template") {
    use File::Copy;
    my $file = &get_template_list($env{'form.template'},$extension);
    my $dest = &Apache::lonnet::filelocation("",$request->uri);
    copy($file,$dest);
    &renderpage($request,$dest);
       } elsif($env{'form.newfile'} && !$templatelist) {
    # I don't like hard-coded filenames but for now, this will work.
    use File::Copy;
    my $templatefilename =
       $request->dir_config('lonIncludes').'/templates/blank.problem';
    &Apache::lonxml::debug("$templatefilename");
    my $dest = &Apache::lonnet::filelocation("",$request->uri);
    copy($templatefilename,$dest);
    &renderpage($request,$dest);
       } else {
    my $url=&HTML::Entities::encode($request->uri,'<>&"');
    my $shownurl=$url;
    $shownurl=~s-^/~-/priv/-;
    my $dest = &Apache::lonnet::filelocation("",$request->uri);
    my $errormsg;
    if ($env{'form.newfile'}) {
       $errormsg='<p><font color="red">'.&mt('You did not select a template.').'</font></p>'."\n";
    }
    my $instructions;
    my $bodytag=&Apache::loncommon::bodytag(undef,undef,undef,
    ($env{'environment.remote'} ne 'off'));
    if ($templatelist) { $instructions=&mt(", select a template from the pull-down menu below.").'<br />'.&mt("Then");}
    my %lt=&Apache::lonlocal::texthash( 'create' => 'Creating a new',
     'resource' => 'resource',
     'requested' => 'The requested file',
     'not exist' => 'currently does not exist',
     'createnew' => 'To create a new',
     'click' => 'click on the',
     'Create' => 'Create',
     'button' => 'button');
    $request->print(<<ENDNEWPROBLEM);
   $bodytag
   <h1>$lt{'create'} $extension $lt{'resource'}</h1>
   $errormsg
   $lt{'requested'} <tt>$shownurl</tt> $lt{'not exist'}.
   <p>
   <b>$lt{'createnew'} $extension$instructions $lt{'click'} "$lt{'Create'} $extension" $lt{'button'}.</b>
   </p>
   <p><form action="$url" method="POST">
   ENDNEWPROBLEM
    if (defined($templatelist)) {
       $request->print("<select name=\"template\">$templatelist</select>");
    }
    $request->print("<br /><input type=\"submit\" name=\"newfile\" value=\"".&mt('Create')." $extension\" />");
    $request->print("</form></p></body>");
       }
       return '';
   }
   
   sub view_or_edit_menu {
       my ($request) = @_;
       my $url=&HTML::Entities::encode($request->uri,'<>&"');
       my %lt=&Apache::lonlocal::texthash( 'would' => 'Would you like to',
         'view' => 'View',
         'Edit' => 'edit',
         'or' => 'or',
         'the problem' => 'the problem');
       $request->print(<<EDITMENU);
   <body bgcolor="#FFFFFF">
   <form action="$url" method="POST">
   $lt{'would'} <input type="submit" name="problemmode" accesskey="v" value="&lt{'view'}">
   &lt{'or'} <input type="submit" name="problemmode" accesskey="e" value="&lt{'Edit'}">
   &lt{'the problem'}.
   </form>
   </body>
   EDITMENU
   }
   
   sub handler {
       #my $t0 = [&gettimeofday()];
       my $request=$_[0];
       $Apache::lonxml::request=$request;
       $Apache::lonxml::debug=$env{'user.debug'};
       $env{'request.uri'}=$request->uri;
       &setuppermissions();
       # some times multiple problemmodes are submitted, need to select
       # the last one
       if ( defined($env{'form.problemmode'}) && ref($env{'form.problemmode'}) ) {
    my $mode=$env{'form.problemmode'}->[-1];
    undef $env{'form.problemmode'};
    $env{'form.problemmode'}=$mode;
       }
   
       my $file=&Apache::lonnet::filelocation("",$request->uri);
   
       #check if we know where we are
       if ($env{'request.course.fn'} && !&Apache::lonnet::symbread()) { 
    # if we are browsing we might not be able to know where we are
    if ($Apache::lonhomework::browse ne 'F' && 
       $env{'request.state'} ne "construct") {
       #should know where we are, so ask
       $request->internal_redirect('/adm/ambiguous'); return OK;
    }
       }
       if (&setupheader($request)) { return OK; }
       &Apache::lonxml::debug("Permissions:$Apache::lonhomework::browse:$Apache::lonhomework::viewgrades:");
       &Apache::lonxml::debug("Problem Mode ".$env{'form.problemmode'});
       my ($symb) = &Apache::lonxml::whichuser();
       &Apache::lonxml::debug('symb is '.$symb);
       if ($env{'request.state'} eq "construct" || $symb eq '') {
    if ($env{'form.resetdata'} eq &mt('Reset Submissions') ||
       $env{'form.resetdata'} eq &mt('New Problem Variation') ||
       $env{'form.newrandomization'} eq &mt('New Randomization')) {
       my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
       &Apache::lonnet::tmpreset($symb,'',$domain,$name);
       &Apache::lonxml::debug("Attempt reset");
    }
       }
       if ($env{'request.state'} eq "construct") {
    if ( -e $file ) {
       &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
       ['problemmode']);
       if (!(defined $env{'form.problemmode'})) {
    #first visit to problem in construction space
    #&view_or_edit_menu($request);
    $env{'form.problemmode'}='View';
    &renderpage($request,$file);
       } elsif ($env{'form.problemmode'} eq &mt('EditXML') ||
        $env{'form.problemmode'} eq 'EditXML') {
    &editxmlmode($request,$file);
       } elsif ($env{'form.problemmode'} eq &mt('Calculate answers')) {
    &analyze($request,$file);
       } else {
    &renderpage($request,$file);
       }
    } else {
       # requested file doesn't exist in contruction space
       &newproblem($request);
    }
       } else {
    # just render the page normally outside of construction space
    &Apache::lonxml::debug("not construct");
    &renderpage($request,$file);
       }
       #my $td=&tv_interval($t0);
       #&Apache::lonxml::debug("Spent $td seconds processing");
       # &Apache::lonhomework::send_footer($request);
       # always turn off debug messages
       $Apache::lonxml::debug=0;
       return OK;
   
 }  }
   
Removed from v.1.20  
changed lines
  Added in v.1.224

FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
500 Internal Server Error

Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator at root@localhost to inform them of the time this error occurred, and the actions you performed just before this error.

More information about this error may be available in the server error log.