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Diff for /loncom/homework/lonhomework.pm between versions 1.93 and 1.287

version 1.93, 2002/10/14 16:43:58 version 1.287, 2007/12/24 06:35:18
Line 24 Line 24
 # /home/httpd/html/adm/gpl.txt  # /home/httpd/html/adm/gpl.txt
 #  #
 # http://www.lon-capa.org/  # http://www.lon-capa.org/
 #  
 # Guy Albertelli  
 # 11/30 Gerd Kortemeyer  
 # 6/1,8/17,8/18 Gerd Kortemeyer  
 # 7/18 Jeremy Bowers  
   
 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::lonplot();  use Apache::lonplot();
 use Apache::inputtags();  use Apache::inputtags();
 use Apache::structuretags();  use Apache::structuretags();
Line 48  use Apache::optionresponse(); Line 44  use Apache::optionresponse();
 use Apache::imageresponse();  use Apache::imageresponse();
 use Apache::essayresponse();  use Apache::essayresponse();
 use Apache::externalresponse();  use Apache::externalresponse();
   use Apache::rankresponse();
   use Apache::matchresponse();
   use Apache::chemresponse();
   use Apache::drawimage();
 use Apache::Constants qw(:common);  use Apache::Constants qw(:common);
 use HTML::Entities();  
 use Apache::loncommon();  use Apache::loncommon();
 #use Time::HiRes qw( gettimeofday tv_interval );  use Apache::lonlocal;
   use Time::HiRes qw( gettimeofday tv_interval );
   use HTML::Entities();
   use File::Copy();
   
   # FIXME - improve commenting
   
   
 BEGIN {  BEGIN {
   &Apache::lonxml::register_insert();      &Apache::lonxml::register_insert();
   }
   
   
   =pod
   
   =item set_bubble_lines()
   
   Called at analysis time to set the bubble lines
   hash for the problem.. This should be called in the
   end_problemtype tag in analysis mode.
   
   We fetch the hash of part id counters from lonxml
       and push them into analyze:{part_id.bubble_lines}.
   
   =cut
   
   sub set_bubble_lines {
       my %bubble_counters = &Apache::lonxml::get_bubble_line_hash();
   
       foreach my $key (keys(%bubble_counters)) {
    $Apache::lonhomework::analyze{"$key.bubble_lines"} =
       $bubble_counters{"$key"};
       }
 }  }
   
   #
   # 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.grade_target'}  )       if( defined($env{'form.grade_target'})) {
  && ($ENV{'form.grade_target'} eq 'tex')) {   &Apache::lonxml::debug("form.grade_target= $env{'form.grade_target'}");
       return ($ENV{'form.grade_target'});  
     } elsif ( defined($ENV{'form.grade_target'}  )   
  && ($Apache::lonhomework::viewgrades == 'F' )) {  
       return ($ENV{'form.grade_target'});  
     }  
    
     if ( defined($ENV{'form.submitted'})) {  
       return ('grade', 'web');  
     } else {      } else {
       return ('web');   &Apache::lonxml::debug("form.grade_target <undefined>");
     }      }
   } elsif ($ENV{'request.state'} eq "construct") {      if (($env{'request.state'} eq "published") ||
     if ( defined($ENV{'form.grade_target'}) ) {   ($env{'request.state'} eq "uploaded")) {
       return ($ENV{'form.grade_target'});   if ( defined($env{'form.grade_target'}  ) 
     }       && ($env{'form.grade_target'} eq 'tex')) {
     if ( defined($ENV{'form.preview'})) {      return ($env{'form.grade_target'});
       if ( defined($ENV{'form.submitted'})) {   } elsif ( defined($env{'form.grade_target'}  ) 
  return ('grade', 'web');    && ($Apache::lonhomework::viewgrades eq 'F' )) {
       } else {      return ($env{'form.grade_target'});
  return ('web');   } elsif ( $env{'form.grade_target'} eq 'webgrade'
       }    && ($Apache::lonhomework::queuegrade eq 'F' )) {
     } else {      return ($env{'form.grade_target'});
       if ( $ENV{'form.problemmode'} eq 'View' ||   }
    $ENV{'form.problemmode'} eq 'Discard Edits and View') {   if ($env{'form.webgrade'} &&
  if ( defined($ENV{'form.submitted'}) &&      ($Apache::lonhomework::modifygrades eq 'F'
      (!defined($ENV{'form.resetdata'})) ) {       || $Apache::lonhomework::queuegrade eq 'F' )) {
   return ('grade', 'web','answer');      return ('grade','webgrade');
  } else {   }
   return ('web','answer');   if ( defined($env{'form.submitted'}) &&
  }       ( !defined($env{'form.newrandomization'}))) {
       } elsif ( $ENV{'form.problemmode'} eq 'Edit' ) {      return ('grade', 'web');
  if ( $ENV{'form.submitted'} eq 'edit' ) {   } else {
   if ( $ENV{'form.submit'} eq 'Submit Changes and View' ) {      return ('web');
     return ('modified','web','answer');   }
   } else {      } elsif ($env{'request.state'} eq "construct") {
     return ('modified','edit');   if ( defined($env{'form.grade_target'}) ) {
   }      return ($env{'form.grade_target'});
  } else {   }
   return ('edit');   if ( defined($env{'form.preview'})) {
  }      if ( defined($env{'form.submitted'})) {
       } else {   return ('grade', 'web');
  return ('web');      } else {
       }   return ('web');
       }
    } else {
       if ($env{'form.problemstate'} eq 'WEB_GRADE') {
    #$env{'form.webgrade'} = 'yes';
    return ('grade','webgrade','answer');
       } elsif ( $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('Save 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 {  
   my ($request)= @_;  
   $request->print(&Apache::lontexconvert::header());  
 #  $request->print('<form name='.$ENV{'form.request.prefix'}.'lonhomework method="POST" action="'.$request->uri.'">');  
 }  
   
 sub createmenu {  sub createmenu {
   my ($which,$request)=@_;      my ($which,$request)=@_;
   if ($which eq 'grade') {      if ($which eq 'grade') {
     $request->print('<script language="JavaScript">    $request->print('<script language="JavaScript"> 
           hwkmenu=window.open("/res/adm/pages/homeworkmenu.html","homeworkremote",            hwkmenu=window.open("/res/adm/pages/homeworkmenu.html","homeworkremote",
                  "height=350,width=150,menubar=no");                   "height=350,width=150,menubar=no");
           </script>');            </script>');
   }      }
 }  }
   
 sub send_footer {  sub proctor_checked_in {
   my ($request)= @_;      my ($slot_name,$slot,$type)=@_;
 #  $request->print('</form>');      my @possible_proctors=split(",",$slot->{'proctor'});
   $request->print(&Apache::lontexconvert::footer());      
       return 1 if (!@possible_proctors);
   
       my $key;
       if ($type eq 'Task') {
    my $version=$Apache::lonhomework::history{'resource.0.version'};
    $key ="resource.$version.0.checkedin";
       } elsif ($type eq 'problem') {
    $key ='resource.0.checkedin';
       }
       # backward compatability, used to be username@domain, 
       # now is username:domain
       my $who = $Apache::lonhomework::history{$key};
       if ($who !~ /:/) {
    $who =~ tr/@/:/;
       }     
       foreach my $possible (@possible_proctors) { 
    if ($who eq $possible
       && $Apache::lonhomework::history{$key.'.slot'} eq $slot_name) {
       return 1;
    }
       }
       
       return 0;
 }  }
   
 $Apache::lonxml::browse='';  sub check_ip_acc {
       my ($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{'request.host'} || $ENV{'REMOTE_ADDR'};
   
       my $name;
       foreach my $pattern (split(',',$acc)) {
    $pattern =~ s/^\s*//;
    $pattern =~ s/\s*$//;
    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;
   }
   
   sub check_slot_access {
       my ($id,$type)=@_;
   
       # does it pass normal muster
       my ($status,$datemsg)=&check_access($id);
       
       my $useslots = &Apache::lonnet::EXT("resource.0.useslots");
       if ($useslots ne 'resource' && $useslots ne 'map' 
    && $useslots ne 'map_map') {
    return ($status,$datemsg);
       }
   
       if ($status eq 'SHOW_ANSWER' ||
    $status eq 'CLOSED' ||
    $status eq 'INVALID_ACCESS' ||
    $status eq 'UNAVAILABLE') {
    return ($status,$datemsg);
       }
       if ($env{'request.state'} eq "construct") {
    return ($status,$datemsg);
       }
       
       if ($type eq 'Task') {
    my $version=$Apache::lonhomework::history{'resource.version'};
    if ($Apache::lonhomework::history{"resource.$version.0.checkedin"} &&
       $Apache::lonhomework::history{"resource.$version.0.status"} eq 'pass') {
       return ('SHOW_ANSWER');
    }
       }
   
       my @slots=
    (split(':',&Apache::lonnet::EXT("resource.0.availablestudent")),
    split(':',&Apache::lonnet::EXT("resource.0.available")));
   
   #    if (!@slots) {
   # return ($status,$datemsg);
   #    }
       my $slotstatus='NOT_IN_A_SLOT';
       my ($returned_slot,$slot_name);
       foreach my $slot (@slots) {
    $slot =~ s/(^\s*|\s*$)//g;
    &Apache::lonxml::debug("getting $slot");
    my %slot=&Apache::lonnet::get_slot($slot);
    &Apache::lonhomework::showhash(%slot);
    if ($slot{'starttime'} < time &&
       $slot{'endtime'} > time &&
       &check_ip_acc($slot{'ip'})) {
       &Apache::lonxml::debug("$slot is good");
       $slotstatus='NEEDS_CHECKIN';
       $returned_slot=\%slot;
       $slot_name=$slot;
       last;
    }
       }
       if ($slotstatus eq 'NEEDS_CHECKIN' &&
    &proctor_checked_in($slot_name,$returned_slot,$type)) {
    &Apache::lonxml::debug("protoctor checked in");
    $slotstatus='CAN_ANSWER';
       }
   
       my ($is_correct,$got_grade,$checkedin);
       if ($type eq 'Task') {
    my $version=$Apache::lonhomework::history{'resource.0.version'};
    $got_grade = 
       ($Apache::lonhomework::history{"resource.$version.0.status"} 
        =~ /^(?:pass|fail)$/);
    $is_correct =  
       ($Apache::lonhomework::history{"resource.$version.0.status"} eq 'pass'
        || $Apache::lonhomework::history{"resource.0.solved"} =~ /^correct_/ );
    $checkedin =
       $Apache::lonhomework::history{"resource.$version.0.checkedin"};
       } elsif ($type eq 'problem') {
    $got_grade  = 1;
    $checkedin  = $Apache::lonhomework::history{"resource.0.checkedin"};
    $is_correct =
       ($Apache::lonhomework::history{"resource.0.solved"} =~/^correct_/);
       }
       
       &Apache::lonxml::debug(" slot is $slotstatus checkedin ($checkedin) got_grade ($got_grade) is_correct ($is_correct)");
       
       # no slot is currently open, and has been checked in for this version
       # but hasn't got a grade, therefore must be awaiting a grade
       if (!defined($slot_name)
    && $checkedin 
    && !$got_grade) {
    return ('WAITING_FOR_GRADE');
       }
   
       # no slot is currently open, and has been checked in for this version
       # previous slot is therefore CLOSED, so therefore the problem is
       if (!defined($slot_name)
    && $checkedin 
    && $type eq 'problem') {
    return ('CLOSED',$datemsg);
       }
   
       if ($slotstatus eq 'NOT_IN_A_SLOT' 
    && $checkedin ) {
   
    if ($got_grade) {
       return ('SHOW_ANSWER');
    } else {
       return ('WAITING_FOR_GRADE');
    }
   
       }
   
       if ( $is_correct) {
    if ($type eq 'problem') {
       return ($status);
    }
    return ('SHOW_ANSWER');
       }
   
       if ( $status eq 'CANNOT_ANSWER' && 
    ($slotstatus ne 'NEEDS_CHECKIN' && $slotstatus ne 'NOT_IN_A_SLOT')) {
    return ($status,$datemsg);
       }
   
       return ($slotstatus,$datemsg,$slot_name,$returned_slot);
   }
   
 # JB, 9/24/2002: Any changes in this function may require a change  # JB, 9/24/2002: Any changes in this function may require a change
 # in lonnavmaps::resource::getDateStatus.  # in lonnavmaps::resource::getDateStatus.
 sub check_access {  sub check_access {
   my ($id) = @_;      my ($id) = @_;
   my $date ='';      my $date ='';
   my $status = '';      my $status;
   my $datemsg = '';      my $datemsg = '';
   my $lastdate = '';      my $lastdate = '';
   my $temp;      my $type;
   my $type;      my $passed;
   my $passed;  
   &Apache::lonxml::debug("checking for part :$id:");      if ($env{'request.state'} eq "construct") {
   &Apache::lonxml::debug("time:".time);   if ($env{'form.problemstate'}) {
   foreach $temp ("opendate","duedate","answerdate") {      if ($env{'form.problemstate'} =~ /^CANNOT_ANSWER/) {
     $lastdate = $date;   if ( ! ($env{'form.problemstate'} eq 'CANNOT_ANSWER_correct' 
     $date = &Apache::lonnet::EXT("resource.$id.$temp");   && &hide_problem_status())) {
     my $thistype = &Apache::lonnet::EXT("resource.$id.$temp.type");      return ('CANNOT_ANSWER',
     if ($thistype eq 'date_interval') {      &mt('is in this state due to author settings.'));
  if ($temp eq 'opendate') {   }
            $date=&Apache::lonnet::EXT("resource.$id.duedate")-$date;      } else {
         }   return ($env{'form.problemstate'},
         if ($temp eq 'answerdate') {   &mt('is in this state due to author settings.'));
            $date=&Apache::lonnet::EXT("resource.$id.duedate")+$date;      }
         }   }
    &Apache::lonxml::debug("in construction ignoring dates");
    $status='CAN_ANSWER';
    $datemsg=&mt('is in under construction');
   # return ($status,$datemsg);
     }      }
     &Apache::lonxml::debug("found :$date: for :$temp:");  
     if ($date eq '') {      &Apache::lonxml::debug("checking for part :$id:");
       $date = "an unknown date"; $passed = 0;      &Apache::lonxml::debug("time:".time);
     } elsif ($date eq 'con_lost') {  
       $date = "an indeterminate date"; $passed = 0;      my ($symb)=&Apache::lonnet::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 my $temp ("opendate","duedate","answerdate") {
       $lastdate = $date;
       if ($temp eq 'duedate') {
    $date = &due_date($id);
       } else {
    $date = &Apache::lonnet::EXT("resource.$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; }
    $date = &Apache::lonlocal::locallocaltime($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/
       &&
       &show_problem_status())
      ||
      $Apache::lonhomework::history{"resource.$id.solved"}=~/^excused/) {
       $status = 'CANNOT_ANSWER';
    }
    if ($status eq 'CANNOT_ANSWER'
       && &show_answer_problem_status()) {
       $status = 'SHOW_ANSWER';
    }
       }
       if ($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[0]) {
       my $first_access=&Apache::lonnet::get_first_access($interval[1]);
       &Apache::lonxml::debug("looking for accesstime $first_access");
       if (!$first_access) {
    $status='NOT_YET_VIEWED';
    my $due_date = &due_date($id);
    my $seconds_left = $due_date - time;
    if ($seconds_left > $interval[0] || $due_date eq '') {
       $seconds_left = $interval[0];
    }
    $datemsg=&seconds_to_human_length($seconds_left);
       }
    }
       }
   
     #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);
   }
   # this should work exactly like the copy in lonnavmaps.pm
   sub due_date {
       my ($part_id,$symb,$udom,$uname)=@_;
       my $date;
       my @interval= &Apache::lonnet::EXT("resource.$part_id.interval",$symb,
          $udom,$uname);
       &Apache::lonxml::debug("looking for interval $part_id $symb @interval");
       my $due_date= &Apache::lonnet::EXT("resource.$part_id.duedate",$symb,
          $udom,$uname);
       &Apache::lonxml::debug("looking for due_date $part_id $symb $due_date");
       if ($interval[0] =~ /\d+/) {
    my $first_access=&Apache::lonnet::get_first_access($interval[1],$symb);
    &Apache::lonxml::debug("looking for first_access $first_access ($interval[1])");
    if (defined($first_access)) {
       my $interval = $first_access+$interval[0];
       $date = (!$due_date || $interval < $due_date) ? $interval
                                                             : $due_date;
    } else {
       $date = $due_date;
    }
     } else {      } else {
       if (time < $date) { $passed = 0; } else { $passed = 1; }   $date = $due_date;
       $date = localtime $date;  
     }      }
     if (!$passed) { $type=$temp; last; }      return $date
   }  }
   &Apache::lonxml::debug("have :$type:$passed:");  
   if ($passed) {  sub seconds_to_human_length {
     $status='SHOW_ANSWER';      my ($length)=@_;
     $datemsg=$date;  
   } elsif ($type eq 'opendate') {      my $seconds=$length%60; $length=int($length/60);
     $status='CLOSED';      my $minutes=$length%60; $length=int($length/60);
     $datemsg = "will open on $date";      my $hours=$length%24;   $length=int($length/24);
   } elsif ($type eq 'duedate') {      my $days=$length;
     $status='CAN_ANSWER';  
     $datemsg = "is due at $date";      my $timestr;
   } elsif ($type eq 'answerdate') {      if ($days > 0) { $timestr.=&mt('[quant,_1,day]',$days); }
     $status='CLOSED';      if ($hours > 0) { $timestr.=($timestr?", ":"").
     $datemsg = "was due on $lastdate, and answers will be available on $date";    &mt('[quant,_1,hour]',$hours); }
   }      if ($minutes > 0) { $timestr.=($timestr?", ":"").
   if ($status eq 'CAN_ANSWER') {      &mt('[quant,_1,minute]',$minutes); }
     #check #tries      if ($seconds > 0) { $timestr.=($timestr?", ":"").
     my $tries = $Apache::lonhomework::history{"resource.$id.tries"};      &mt('[quant,_1,second]',$seconds); }
     my $maxtries = &Apache::lonnet::EXT("resource.$id.maxtries");      return $timestr;
     if ( $tries eq '' ) { $tries = '0'; }  
     if ( $maxtries eq '' ) { $maxtries = '2'; }   
     if ($tries >= $maxtries) { $status = 'CANNOT_ANSWER'; }   
   }  
   
   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';  
     $datemsg='is closed but you are allowed to view it';  
   }  
   if ($ENV{'request.state'} eq "construct") {  
     &Apache::lonxml::debug("in construction ignoring dates");  
     $status='CAN_ANSWER';  
     $datemsg='is in under construction';  
   }  
   return ($status,$datemsg);  
 }  }
   
 sub showhash {  sub showhash {
   my (%hash) = @_;      my (%hash) = @_;
   &showhashsubset(\%hash,'');      &showhashsubset(\%hash,'.');
   return '';      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 {  sub showhashsubset {
   my ($hash,$keyre) = @_;      my ($hash,$keyre) = @_;
   my $resultkey;      my $resultkey;
   foreach $resultkey (sort keys %$hash) {      foreach $resultkey (sort keys %$hash) {
     if ($resultkey =~ /$keyre/) {   if ($resultkey !~ /$keyre/) { next; }
       if (ref($$hash{$resultkey})) {   if (ref($$hash{$resultkey})  eq 'ARRAY' ) {
  if ($$hash{$resultkey} =~ /ARRAY/ ) {      &Apache::lonxml::debug("$resultkey ---- ".
   my $string="$resultkey ---- (";     &showarray($$hash{$resultkey}));
   foreach my $elm (@{ $$hash{$resultkey} }) {   } elsif (ref($$hash{$resultkey}) eq 'HASH' ) {
     $string.="$elm,";      &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
   }      &showhashsubset($$hash{$resultkey},'.');
   chop($string);   } else {
   &Apache::lonxml::debug("$string)");      &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
  } else {   }
   &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");      }
  }      &Apache::lonxml::debug("\n<br />restored values^</br>\n");
       } else {      return '';
  &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");  
       }  
     }  
   }  
   &Apache::lonxml::debug("\n<br />restored values^</br>\n");  
   return '';  
 }  }
   
 sub setuppermissions {  sub setuppermissions {
   $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});      $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$env{'request.filename'});
   $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});      my $viewgrades = &Apache::lonnet::allowed('vgr',$env{'request.course.id'});
   return ''      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;
   
       if ($Apache::lonhomework::browse eq 'F' && 
    $env{'form.devalidatecourseresdata'} eq 'on') {
    my (undef,$courseid) = &Apache::lonnet::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;
   
       my $queuegrade = &Apache::lonnet::allowed('mqg',$env{'request.course.id'});
       if (! $queuegrade && 
    exists($env{'request.course.sec'}) && 
    $env{'request.course.sec'} !~ /^\s*$/) {
    $queuegrade = 
       &Apache::lonnet::allowed('qgr',$env{'request.course.id'}.
        '/'.$env{'request.course.sec'});
       }
       $Apache::lonhomework::queuegrade = $queuegrade;
       return '';
   }
   
   sub unset_permissions {
       undef($Apache::lonhomework::queuegrade);
       undef($Apache::lonhomework::modifygrades);
       undef($Apache::lonhomework::viewgrades);
       undef($Apache::lonhomework::browse);
 }  }
   
 sub setupheader {  sub setupheader {
   my $request=$_[0];      my $request=$_[0];
   if ($ENV{'browser.mathml'}) {      &Apache::loncommon::content_type($request,'text/html');
     $request->content_type('text/xml');      if (!$Apache::lonxml::debug && ($ENV{'REQUEST_METHOD'} eq 'GET')) {
   } else {   &Apache::loncommon::no_cache($request);
     $request->content_type('text/html');      }
   }  #    $request->set_last_modified(&Apache::lonnet::metadata($request->uri,
   if (!$Apache::lonxml::debug && ($ENV{'REQUEST_METHOD'} eq 'GET')) {  #  'lastrevisiondate'));
     &Apache::loncommon::no_cache($request);      $request->send_http_header;
   }      return OK if $request->header_only;
   $request->send_http_header;      return ''
   return OK if $request->header_only;  
   return ''  
 }  }
   
 sub handle_save_or_undo {  sub handle_save_or_undo {
   my ($request,$problem,$result) = @_;      my ($request,$problem,$result) = @_;
   my $file    = &Apache::lonnet::filelocation("",$request->uri);      my $file    = &Apache::lonnet::filelocation("",$request->uri);
   my $filebak =$file.".bak";      my $filebak =$file.".bak";
   my $filetmp =$file.".tmp";      my $filetmp =$file.".tmp";
   my $error=0;  
   
   if ($ENV{'form.Undo'} eq 'undo') {  
     my $error=0;      my $error=0;
     if (!copy($file,$filetmp)) { $error=1; }      if ($env{'form.Undo'} eq &mt('undo')) {
     if ((!$error) && (!copy($filebak,$file))) { $error=1; }   my $error=0;
     if ((!$error) && (!move($filetmp,$filebak))) { $error=1; }   if (!&File::Copy::copy($file,$filetmp)) { $error=1; }
     if (!$error) {   if ((!$error) && (!&File::Copy::copy($filebak,$file))) { $error=1; }
       $request->print("<p><b>Undid changes, Switched $filebak and $file</b></p>");   if ((!$error) && (!&File::Copy::move($filetmp,$filebak))) { $error=1; }
    if (!$error) {
       &Apache::lonxml::info("<p><b>".
     &mt("Undid changes, Switched [_1] and [_2]",
         '<span class="LC_filename">'.$filebak.
         '</span>',
         '<span class="LC_filename">'.$file.
         '</span>')."</b></p>");
    } else {
       &Apache::lonxml::info("<p><span class=\"LC_error\">".
     &mt("Unable to undo, unable to switch [_1] and [_2]",
         '<span class="LC_filename">'.
         $filebak.'</span>',
         '<span class="LC_filename">'.
         $file.'</span>')."</span></p>");
       $error=1;
    }
     } else {      } else {
       $request->print("<p><font color=\"red\" size=\"+1\"><b>Unable to undo, unable to switch $filebak and $file</b></font></p>");          &Apache::lonnet::correct_line_ends($result);
       $error=1;   my $fs=Apache::File->new(">$filebak");
    if (defined($fs)) {
       print $fs $$problem;
       &Apache::lonxml::info("<b>".&mt("Making Backup to [_1]",
       '<span class="LC_filename">'.
       $filebak.'</span>').
     "</b>");
    } else {
       &Apache::lonxml::info("<span class=\"LC_error\">".
     &mt("Unable to make backup [_1]",
         '<span class="LC_filename">'.
         $filebak.'</span>')."</span>");
       $error=2;
    }
    my $fh=Apache::File->new(">$file");
    if (defined($fh)) {
       print $fh $$result;
       &Apache::lonxml::info("<b>".&mt("Saving Modifications to [_1]",
      '<span class="LC_filename">'.
       $file.'</span>' )."</b>");
    } else {
       &Apache::lonxml::info('<span class="LC_error">'.
     &mt("Unable to write to [_1]",
         '<span class="LC_filename">'.
         $file.'</span>').
     '</span>');
       $error|=4;
    }
     }      }
   } else {      return $error;
     my $fs=Apache::File->new(">$filebak");  }
     if (defined($fs)) {  
       print $fs $$problem;  sub analyze_header {
       $request->print("<b>Making Backup to $filebak</b><br />");      my ($request) = @_;
     } else {      my $result =
       $request->print("<font color=\"red\" size=\"+1\"><b>Unable to make backup $filebak</b></font>");   &Apache::loncommon::start_page('Analyzing a problem',undef);
       $error=2;  
       $result .= 
    &Apache::lonxml::message_location().'
               <form name="lonhomework" method="POST" action="'.
       &HTML::Entities::encode($env{'request.uri'},'<>&"').'">'.
       &Apache::structuretags::remember_problem_state().'
               <div class="LC_edit_problem_analyze_header">
               <input type="submit" name="problemmode" value="'.&mt("EditXML").'" />
               <input type="submit" name="problemmode" value="'.&mt('Edit').'" />
               <hr class="LC_edit_problem_divide" />
   
               <input type="submit" name="submit" value="'.&mt("View").'" />
               <hr class="LC_edit_problem_divide" />
               </div>
               </form>';
       &Apache::lonxml::add_messages(\$result);
       $request->print($result);
       $request->rflush();
   }
   
   sub analyze_footer {
       my ($request) = @_;
       $request->print(&Apache::loncommon::end_page());
       $request->rflush();
   }
   
   sub analyze {
       my ($request,$file) = @_;
       &Apache::lonxml::debug("Analyze");
       my $result;
       my %overall;
       my %seedexample;
       my %allparts;
       my $rndseed=$env{'form.rndseed'};
       &analyze_header($request);
       my %prog_state=
    &Apache::lonhtmlcommon::Create_PrgWin($request,&mt('Analyze Progress'),
         &mt('Getting Problem Variants'),
         $env{'form.numtoanalyze'},
         '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'   ) {
    foreach my $name (keys(%{ $analyze{$part.'.answer'} })) {
       my $i=0;
       foreach my $answer_part (@{ $analyze{$part.'.answer'}{$name} }) {
    push( @{ $overall{$part.'.answer'}[$i] },
         $answer_part);
    my $concatanswer= join("\0",@{ $answer_part });
    if (($concatanswer eq '') || ($concatanswer=~/^\@/)) {
       $answer_part = ['<span class="LC_error">'.&mt('Error').'</span>'];
    }
    $seedexample{join("\0",$part,$i,@{$answer_part})}=
       $thisseed;
    $i++;
       }
    }
    if (!keys(%{ $analyze{$part.'.answer'} })) {
       my $answer_part = 
    ['<span class="LC_error">'.&mt('Error').'</span>'];
       $seedexample{join("\0",$part,0,@{$answer_part})}=
    $thisseed;
       push( @{ $overall{$part.'.answer'}[0] },
     $answer_part);
    }
       }
    }
     }      }
     my $fh=Apache::File->new(">$file");      &Apache::lonhtmlcommon::Update_PrgWin($request,\%prog_state,
     if (defined($fh)) {    &mt('Analyzing Results'));
       print $fh $$result;      $request->print('<hr class="LC_edit_problem_divide" />'.&mt('List of possible answers').': ');
       $request->print("<b>Saving Modifications to $file</b><br />");      foreach my $part (sort(keys(%allparts))) {
     } else {   if (defined(@{ $overall{$part.'.answer'} })) {
       $request->print("<font color=\"red\" size=\"+1\"><b>Unable to write to $file</b></font>");      for (my $i=0;$i<scalar(@{ $overall{$part.'.answer'} });$i++) {
       $error|=4;   my $num_cols=scalar(@{ $overall{$part.'.answer'}[$i][0] });
    $request->print('<table class="thinborder"><tr><th colspan="'.($num_cols+1).'">'.&mt('Part').' '.$part);
    if (scalar(@{ $overall{$part.'.answer'} }) > 1) {
       $request->print(&mt(' Answer [_1]',$i+1));
    }
    $request->print('</th></tr>');
    my %frequency;
    foreach my $answer (sort {$a->[0] <=> $b->[0]} (@{ $overall{$part.'.answer'}[$i] })) {
       $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{join("\0",$part,$i,$answer)}.'">'.$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 ) {
   return $error;   $request->print('<p>'.&mt('Found no analyzable responses in this problem, currently only Numerical, Formula and String response styles are supported.').'</p>');
       }
       &Apache::lonhtmlcommon::Close_PrgWin($request,\%prog_state);
       &analyze_footer($request);
       &Apache::lonhomework::showhash(%overall);
       return $result;
 }  }
   
 sub analyze {  {
   my ($request,$file) = @_;      my $show_problem_status;
   &Apache::lonxml::debug("Analyze");      sub reset_show_problem_status {
   my $result=&Apache::lonnet::ssi($request->uri,('grade_target' => 'analyze'));   undef($show_problem_status);
   &Apache::lonxml::debug(":$result:");      }
   (my $garbage,$result)=split(/_HASH_REF__/,$result,2);  
   &showhash(&Apache::lonnet::str2hash($result));      sub set_show_problem_status {
   return $result;   my ($new_status) = @_;
    $show_problem_status = lc($new_status);
       }
   
       sub hide_problem_status {
    return ($show_problem_status eq 'no'
    || $show_problem_status eq 'no_feedback_ever');
       }
   
       sub show_problem_status {
    return ($show_problem_status eq 'yes'
    || $show_problem_status eq 'answer'
    || $show_problem_status eq '');
       }
       
       sub show_some_problem_status {
    return ($show_problem_status eq 'no');
       }
   
       sub show_no_problem_status {
    return ($show_problem_status eq 'no_feedback_ever');
       }
     
       sub show_answer_problem_status {
    return ($show_problem_status eq 'answer');
       }
 }  }
   
 sub editxmlmode {  sub editxmlmode {
   my ($request,$file) = @_;      my ($request,$file) = @_;
   my $result;      my $result;
   my $problem=&Apache::lonnet::getfile($file);      my $problem=&Apache::lonnet::getfile($file);
   if ($problem == -1) {      if ($problem eq -1) {
     &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");   &Apache::lonxml::error("<b> ".&mt('Unable to find').
     $problem='';         " <i>$file</i></b>");
   }   $problem='';
   if (defined($ENV{'form.editxmltext'}) || defined($ENV{'form.Undo'})) {      }
     my $error=&handle_save_or_undo($request,\$problem,      if (defined($env{'form.editxmltext'}) || defined($env{'form.Undo'})) {
    \$ENV{'form.editxmltext'});   my $error=&handle_save_or_undo($request,\$problem,
     if (!$error) { $problem=&Apache::lonnet::getfile($file); }         \$env{'form.editxmltext'});
   }   if (!$error) { $problem=&Apache::lonnet::getfile($file); }
   &Apache::lonhomework::showhashsubset(\%ENV,'^form');      }
   if ( $ENV{'form.submit'} eq 'Submit Changes and View' ) {      &Apache::lonhomework::showhashsubset(\%env,'^form');
     &Apache::lonhomework::showhashsubset(\%ENV,'^form');      if ( $env{'form.submit'} eq &mt('Save and View') ) {
     $ENV{'form.problemmode'}='View';   &Apache::lonhomework::showhashsubset(\%env,'^form');
     &renderpage($request,$file);   $env{'form.problemmode'}='View';
   } else {   &renderpage($request,$file);
     my ($rows,$cols) = &Apache::edit::textarea_sizes(\$problem);      } else {
     my $xml_help = Apache::loncommon::help_open_topic("Problem_Editor_XML_Index");   my ($rows,$cols) = &Apache::edit::textarea_sizes(\$problem);
     if ($cols > 80) { $cols = 80; }   my $xml_help = '<table><tr><td>'.
     if ($cols < 70) { $cols = 70; }      &Apache::loncommon::helpLatexCheatsheet("Problem_Editor_XML_Index",
     if ($rows < 20) { $rows = 20; }      "Problem Editing Help").
     $result.='<html><body bgcolor="#FFFFFF">      '</td><td>'.
             <form name="lonhomework" method="POST" action="'.         &Apache::loncommon::help_open_menu(undef,undef,5,'Authoring').
       $ENV{'request.uri'}.'">                  '</td></tr></table>';
             <input type="hidden" name="problemmode" value="EditXML" />   if ($cols > 80) { $cols = 80; }
             <input type="submit" name="problemmode" value="Discard Edits and View" />   if ($cols < 70) { $cols = 70; }
             <input type="submit" name="problemmode" value="Edit" />   if ($rows < 20) { $rows = 20; }
             <hr />   my $js =
             <input type="submit" name="submit" value="Submit Changes" />      &Apache::edit::js_change_detection(). 
             <input type="submit" name="submit" value="Submit Changes and View" />      &Apache::loncommon::resize_textarea_js();
             <input type="submit" name="Undo" value="undo" />   my $only_body =  ($env{'environment.remote'} eq 'off')? 0 : 1;
             <hr />   my $start_page = 
             ' . $xml_help . ' Problem Help<br>      &Apache::loncommon::start_page(&mt("EditXML [_1]",$file),$js,
             <textarea rows="'.$rows.'" cols="'.$cols.'" name="editxmltext">'.     {'no_auto_mt_title' => 1,
       &HTML::Entities::encode($problem).'</textarea>      'only_body'        => $only_body,
             </form></body></html>';      'add_entries'      => {
     $request->print($result);   'onresize' => q[resize_textarea('LC_editxmltext','LC_aftertextarea')],
   }   'onload'   => q[resize_textarea('LC_editxmltext','LC_aftertextarea')],
   return '';      }});
   
    $result.=$start_page.
       &renderpage($request,$file,['no_output_web'],1).
               '<form '.&Apache::edit::form_change_detection().' name="lonhomework" method="POST" action="'.
       &HTML::Entities::encode($env{'request.uri'},'<>&"').'">'.
       &Apache::structuretags::remember_problem_state().'
               <div class="LC_edit_problem_editxml_header">
                 <table class="LC_edit_problem_header_title"><tr><td>
                  '.&mt('Problem Editing').&Apache::loncommon::help_open_topic('Problem_Editor_XML_Index').'
                   </td><td align="right">
                     '.&Apache::loncommon::helpLatexCheatsheet().'
                   </td></tr>
                 </table>
                 <div class="LC_edit_problem_discards">
                   <input type="hidden" name="problemmode" value="'.&mt('EditXML').'" />
                   <input type="submit" name="problemmode" accesskey="d" value="'.&mt('Discard Edits and View').'" />
                   <input type="submit" '.&Apache::edit::submit_ask_anyway().'name="problemmode" accesskey="e" value="'.&mt('Edit').'" />
                   <input type="submit" name="Undo" accesskey="u" value="'.&mt('undo').'" />
                 </div>
                 <div class="LC_edit_problem_saves">
                   <input type="submit" name="submit" accesskey="s" value="'.&mt('Save').'" />
                   <input type="submit" name="submit" accesskey="v" value="'.&mt('Save and View').'" />
                 </div>
                 <hr class="LC_edit_problem_divide" />
         '.&Apache::lonxml::message_location().'
               </div>
               '  . '
               <textarea '.&Apache::edit::element_change_detection().
                 ' rows="'.$rows.'" cols="'.$cols.'" style="width:100%" '.
         ' name="editxmltext" id="LC_editxmltext">'.
         &HTML::Entities::encode($problem,'<>&"').'</textarea>
               <div id="LC_aftertextarea">
               </div>
               </form>'.&Apache::loncommon::end_page();
    &Apache::lonxml::add_messages(\$result);
    $request->print($result);
       }
       return '';
 }  }
   
   #
   #    Render the page in whatever target desired.
   #
 sub renderpage {  sub renderpage {
   my ($request,$file) = @_;      my ($request,$file,$targets,$return_string) = @_;
   
   my (@targets) = &get_target();      my @targets = @{$targets || [&get_target()]};
   &Apache::lonxml::debug("Running targets ".join(':',@targets));      &Apache::lonhomework::showhashsubset(\%env,'form.');
   foreach my $target (@targets) {      &Apache::lonxml::debug("Running targets ".join(':',@targets));
     #my $t0 = [&gettimeofday()];  
     my $problem=&Apache::lonnet::getfile($file);      my $overall_result;
     if ($problem == -1) {      foreach my $target (@targets) {
       &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");   # FIXME need to do something intelligent when a problem goes
       $problem='';          # from viewable to not viewable due to map conditions
     }   #&setuppermissions();
    #if (   $Apache::lonhomework::browse ne '2'
     my %mystyle;   #    && $Apache::lonhomework::browse ne 'F' ) {
     my $result = '';   #    $request->print(" You most likely shouldn't see me.");
     &Apache::inputtags::initialize_inputtags;   #}
     &Apache::edit::initialize_edit;   #my $t0 = [&gettimeofday()];
     if ($target eq 'analyze') { %Apache::lonhomework::anaylze=(); }   my $output=1;
     if ($target eq 'web') {   if ($target eq 'no_output_web') {
       my ($symb)=&Apache::lonxml::whichuser();      $target = 'web'; $output=0;
       if ($symb eq '') {   }
  if ($ENV{'request.state'} eq "construct") {   my $problem=&Apache::lonnet::getfile($file);
  } else {   my $result;
           my $help = Apache::loncommon::help_open_topic("Ambiguous_Reference");   if ($problem eq -1) {
   $request->print("Browsing or <a href=\"/adm/ambiguous\">ambiguous</a> reference, submissions ignored $help<br />");      $problem='';
  }      my $filename=(split('/',$file))[-1];
       }      my $error =
       #if ($Apache::lonhomework::viewgrades eq 'F') {&createmenu('grade',$request); }   "<b> ".&mt('Unable to find [_1]',
     }     ' <span class="LC_filename">'.$filename.'</span>')
     if ($target eq 'answer') { &showhash(%Apache::lonhomework::history); }   ."</b>";
     if ($target eq 'web') {&Apache::lonhomework::showhashsubset(\%ENV,'^form');}      $result.=
    &Apache::loncommon::simple_error_page($request,'Not available',
     my $default=&Apache::lonnet::getfile('/home/httpd/html/res/adm/includes/default_homework.lcpm');        $error);
     if ($default == -1) {      return;
       &Apache::lonxml::error("<b>Unable to find <i>default_homework.lcpm</i></b>");   }
       $default='';  
     }   my %mystyle;
     &Apache::lonxml::debug("Should be parsing now");   if ($target eq 'analyze') { %Apache::lonhomework::analyze=(); }
     $result = &Apache::lonxml::xmlparse($request, $target, $problem,   if ($target eq 'answer') { &showhash(%Apache::lonhomework::history); }
  $default.&setup_vars($target),%mystyle);   if ($target eq 'web') {&Apache::lonhomework::showhashsubset(\%env,'^form');}
   
     #$request->print("Result follows:");   &Apache::lonxml::debug("Should be parsing now");
     if ($target eq 'modified') {   $result .= &Apache::lonxml::xmlparse($request, $target, $problem,
       &handle_save_or_undo($request,\$problem,\$result);       &setup_vars($target),%mystyle);
    &finished_parsing();
    if (!$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);   
    $request->rflush();   
     } else {      } else {
       if ($target eq 'analyze') {   return $overall_result;
  $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);  
     }      }
     #$request->print(":Result ends");  
     #my $td=&tv_interval($t0);  
   }  
 }  }
   
 # with no arg it returns a HTML <option> list of the template titles  sub finished_parsing {
 # with one arg it returns the filename associated with the arg passed      undef($Apache::lonhomework::parsing_a_problem);
       undef($Apache::lonhomework::parsing_a_task);
   }
   
 sub get_template_list {  sub get_template_list {
   my ($namewanted,$extension) = @_;      my ($extension) = @_;
   my $result;      my $result;
   my @allnames;      my @allnames;
   &Apache::lonxml::debug("Looking for :$extension:");      &Apache::lonxml::debug("Looking for :$extension:");
   foreach my $file (</home/httpd/html/res/adm/includes/templates/*.$extension>) {      my $glob_extension  = $extension;
     my $name=&Apache::lonnet::metadata($file,'title');      if ($extension eq 'survey' || $extension eq 'exam') {
     if ($namewanted && ($name eq $namewanted)) {   $glob_extension = 'problem';
       $result=$file;      }
       last;      my @files = glob($Apache::lonnet::perlvar{'lonIncludes'}.
     } else {       '/templates/*.'.$glob_extension);
       push (@allnames, $name);      @files = map {[$_,&mt(&Apache::lonnet::metadata($_, 'title'))]} (@files);
       @files = sort {$a->[1] cmp $b->[1]} (@files);
       my ($midpoint,$seconddiv,$numfiles);
       $numfiles = 0;
       foreach my $file (@files) {
           next if ($file->[1] !~ /\S/);
           $numfiles ++;
       }
       if ($numfiles > 0) {
           $result = '<div class="LC_left_float">';
           $midpoint = int($numfiles/2);
           if ($numfiles%2) {
               $midpoint ++;
           }
     }      }
   }      my $count = 0;
   if (@allnames && !$result) {      foreach my $file (@files) {
     $result="<option>Select a $extension type</option>\n<option>".   next if ($file->[1] !~ /\S/);
       join('</option><option>',sort(@allnames)).'</option>';   $result .=
   }      '<label><input type="radio" name="template" value="'.$file->[0].'" />'.
   return $result;      $file->[1].'</label><br />'."\n";
           $count ++;
           if ((!$seconddiv) && ($count >= $midpoint)) {
               $result .= '</div>'."\n".'<div class="LC_left_float">'."\n";
               $seconddiv = 1;
           }
       }
       if ($numfiles > 0) {
           $result .= '</div>'."\n".'<div class="LC_clear_float_footer"></div>'."\n";
       }
       return $result;
 }  }
   
 sub newproblem {  sub newproblem {
     my ($request) = @_;      my ($request) = @_;
     my $extension=$request->uri;  
     $extension=~s:^.*\.([\w]+)$:$1:;      if ($env{'form.template'}) {
     &Apache::lonxml::debug("Looking for :$extension:");   my $file = $env{'form.template'};
     if ($ENV{'form.template'} &&  
  $ENV{'form.template'} ne "Select a $extension type") {  
  use File::Copy;  
  my $file = &get_template_list($ENV{'form.template'},$extension);  
  my $dest = &Apache::lonnet::filelocation("",$request->uri);   my $dest = &Apache::lonnet::filelocation("",$request->uri);
  copy($file,$dest);   &File::Copy::copy($file,$dest);
  &renderpage($request,$dest);   &renderpage($request,$dest);
     } elsif($ENV{'form.newfile'}) {   return;
  # I don't like hard-coded filenames but for now, this will work.      }
  use File::Copy;  
  my $templatefilename =       my ($extension) = ($request->uri =~ m/\.(\w+)$/);
     $request->dir_config('lonIncludes').'/templates/blank.problem';      &Apache::lonxml::debug("Looking for :$extension:");
       my $templatelist=&get_template_list($extension);
       if ($env{'form.newfile'} && !$templatelist) {
    # no templates found
    my $templatefilename =
       $request->dir_config('lonIncludes').'/templates/blank.'.$extension;
  &Apache::lonxml::debug("$templatefilename");   &Apache::lonxml::debug("$templatefilename");
  my $dest = &Apache::lonnet::filelocation("",$request->uri);   my $dest = &Apache::lonnet::filelocation("",$request->uri);
  copy($templatefilename,$dest);   &File::Copy::copy($templatefilename,$dest);
  &renderpage($request,$dest);   &renderpage($request,$dest);
     } else {      } else {
  my $templatelist=&get_template_list('',$extension);   my $url=&HTML::Entities::encode($request->uri,'<>&"');
  my $url=$request->uri;   my $shownurl=$url;
    $shownurl=~s-^/~-/priv/-;
  my $dest = &Apache::lonnet::filelocation("",$request->uri);   my $dest = &Apache::lonnet::filelocation("",$request->uri);
    my $errormsg;
  my $instructions;   my $instructions;
  if ($templatelist) { $instructions=", select a template from the pull-down menu below. Then";}   my $start_page = 
  $request->print(<<ENDNEWPROBLEM);      &Apache::loncommon::start_page("Create New $extension");
 <body bgcolor="#FFFFFF">   $request->print("
 The requested file $url doesn\'t exist. <br />  $start_page
 To create a new $extension$instructions click on the Create $extension button.  <h1>".&mt("Creating a new $extension resource.")."</h1>
 <form action="$url" method="POST">  $errormsg
 ENDNEWPROBLEM  ".&mt("The requested file [_1] currently does not exist.",
         "<tt>$shownurl</tt>")."
   <p>
   <b>
   ".&mt("To create a new $extension, select a template from the".
         " list below. Then click on the \"Create $extension\" button.")."</b>
   </p><form action=\"$url\" method=\"POST\">");
   
  if (defined($templatelist)) {   if (defined($templatelist)) {
     $request->print("<select name=\"template\">$templatelist</select>");      $request->print($templatelist);
  }   }
  $request->print("<br /><input type=\"submit\" name=\"newfile\" value=\"Create $extension\" />");   $request->print('<br /><input type="submit" name="newfile" value="'.
  $request->print("</form></body>");   &mt("Create $extension").'" />');
    $request->print("</form></p>".&Apache::loncommon::end_page());
     }      }
     return '';      return;
 }  }
   
 sub view_or_edit_menu {  sub update_construct_style {
   my ($request) = @_;      if ($env{'request.state'} eq "construct"
   my $url=$request->uri;   && $env{'form.problemmode'} eq &mt('View') 
   $request->print(<<EDITMENU);   &&  defined($env{'form.submitted'})
 <body bgcolor="#FFFFFF">   && !defined($env{'form.resetdata'})
 <form action="$url" method="POST">   && !defined($env{'form.newrandomization'})) {
 Would you like to <input type="submit" name="problemmode" value="View"> or   if ((!$env{'form.style_file'} && $env{'construct.style'})
 <input type="submit" name="problemmode" value="Edit"> the problem.      ||$env{'form.clear_style_file'}) {
 </form>      &Apache::lonnet::delenv('construct\\.style');
 </body>   } elsif ($env{'form.style_file'} 
 EDITMENU      && $env{'construct.style'} ne $env{'form.style_file'}) {
       &Apache::lonnet::appenv('construct.style' => 
           $env{'form.style_file'});
    }
       }
 }  }
   
 sub handler {  
   #my $t0 = [&gettimeofday()];  
   my $request=$_[0];  
   
   if ( $ENV{'user.name'} eq 'albertel' ) {$Apache::lonxml::debug=1;}  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;
       }
   
   if (&setupheader($request)) { return OK; }      my $file=&Apache::lonnet::filelocation("",$request->uri);
   $ENV{'request.uri'}=$request->uri;  
   
   #setup permissions      #check if we know where we are
   $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});      if ($env{'request.course.fn'} && !&Apache::lonnet::symbread()) { 
   $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});   # if we are browsing we might not be able to know where we are
   &Apache::lonxml::debug("Permissions:$Apache::lonhomework::browse:$Apache::lonhomework::viewgrades:");   if ($Apache::lonhomework::browse ne 'F' && 
   # some times multiple problemmodes are submitted, need to select      $env{'request.state'} ne "construct") {
   # the last one      #should know where we are, so ask
   &Apache::lonxml::debug("Problem Mode ".$ENV{'form.problemmode'});      &unset_permissions();
   if ( defined($ENV{'form.problemmode'}) &&      $request->internal_redirect('/adm/ambiguous');
        ref($ENV{'form.problemmode'}) ) {      return OK;
     &Apache::lonxml::debug("Problem Mode ".join(",",@$ENV{'form.problemmode'}));   }
     my $mode=$ENV{'form.problemmode'}->[-1];      }
     undef $ENV{'form.problemmode'};      if (&setupheader($request)) {
     $ENV{'form.problemmode'}=$mode;   &unset_permissions();
   }   return OK;
   &Apache::lonxml::debug("Problem Mode ".$ENV{'form.problemmode'});      }
   my $file=&Apache::lonnet::filelocation("",$request->uri);      &Apache::lonxml::debug("Permissions:$Apache::lonhomework::browse:$Apache::lonhomework::viewgrades:$Apache::lonhomework::modifygrades:$Apache::lonhomework::queuegrade");
       &Apache::lonxml::debug("Problem Mode ".$env{'form.problemmode'});
   #check if we know where we are      my ($symb) = &Apache::lonnet::whichuser();
   if ($ENV{'request.course.fn'} && !&Apache::lonnet::symbread()) {       &Apache::lonxml::debug('symb is '.$symb);
     # if we are browsing we might not be able to know where we are      if ($env{'request.state'} eq "construct") {
     if ($Apache::lonhomework::browse ne 'F') {   if ( -e $file ) {
       #should know where we are, so ask      &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
       $request->internal_redirect('/adm/ambiguous'); return;      ['problemmode']);
     }      if (!(defined $env{'form.problemmode'})) {
   }   #first visit to problem in construction space
    $env{'form.problemmode'}='View';
   if ($ENV{'request.state'} eq "construct") {   &renderpage($request,$file);
     if ($ENV{'form.resetdata'} eq 'Reset Submissions') {      } elsif ($env{'form.problemmode'} eq &mt('EditXML') ||
       my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();       $env{'form.problemmode'} eq 'EditXML') {
       &Apache::lonnet::tmpreset($symb,'',$domain,$name);   &editxmlmode($request,$file);
     }      } elsif ($env{'form.problemmode'} eq &mt('Calculate answers')) {
     if ( -e $file ) {   &analyze($request,$file);
       if (!(defined $ENV{'form.problemmode'})) {      } else {
  #first visit to problem in construction space   &update_construct_style();
  #&view_or_edit_menu($request);   &renderpage($request,$file);
  $ENV{'form.problemmode'}='View';      }
  &renderpage($request,$file);   } else {
       } elsif ($ENV{'form.problemmode'} eq 'EditXML') {      # requested file doesn't exist in contruction space
  &editxmlmode($request,$file);      &newproblem($request);
       } elsif ($ENV{'form.problemmode'} eq 'Answer Distribution') {   }
  &analyze($request,$file);  
       } else {  
  &renderpage($request,$file);  
       }  
     } else {      } else {
       # requested file doesn't exist in contruction space   # just render the page normally outside of construction space
       &newproblem($request);   &Apache::lonxml::debug("not construct");
    &renderpage($request,$file);
     }      }
   } else {      #my $td=&tv_interval($t0);
     # just render the page normally outside of construction space      #&Apache::lonxml::debug("Spent $td seconds processing");
     &Apache::lonxml::debug("not construct");      # always turn off debug messages
     &renderpage($request,$file);      $Apache::lonxml::debug=0;
   }      &unset_permissions();
   #my $td=&tv_interval($t0);      return OK;
   #&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.1.93  
changed lines
  Added in v.1.287

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.