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version 1.31, 2001/01/11 15:20:58 version 1.253, 2006/06/24 01:28:17
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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  # $Id$
 # 6/1 Gerd Kortemeyer  #
   # 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::hint;  use Apache::randomlabel();
 use Apache::outputtags;  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 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= $env{'form.grade_target'}");
     } else {      } else {
       return ('web');   &Apache::lonxml::debug("form.grade_target <undefined>");
     }  
   } elsif ($ENV{'request.state'} eq "construct") {  
     if ( defined $ENV{'form.preview'}) {  
       if ( defined $ENV{'form.submit'}) {  
  return ('grade', 'web');  
       } else {  
  return ('web');  
       }  
     } else {  
       #return ('edit');  
       #edit is currently broken  
       return ('web');  
     }      }
   }      if (($env{'request.state'} eq "published") ||
   return ();   ($env{'request.state'} eq "uploaded")) {
    if ( defined($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'});
    } elsif ( $env{'form.grade_target'} eq 'webgrade'
     && ($Apache::lonhomework::queuegrade eq 'F' )) {
       return ($env{'form.grade_target'});
    }
    if ($env{'form.webgrade'} &&
       ($Apache::lonhomework::modifygrades eq 'F'
        || $Apache::lonhomework::queuegrade eq 'F' )) {
       return ('grade','webgrade');
    }
    if ( defined($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 ();
 }  }
   
 sub setup_vars {  sub setup_vars {
   my ($target) = @_;      my ($target) = @_;
   return ';'      return ';'
 #  return ';$external::target='.$target.';';  #  return ';$external::target='.$target.';';
 }  }
   
 sub send_header {  sub createmenu {
   my ($request)= @_;      my ($which,$request)=@_;
   $request->print(&Apache::lontexconvert::header());      if ($which eq 'grade') {
   $ENV{'request.uri'}=$request->uri;   $request->print('<script language="JavaScript"> 
 #  $request->print('<form name='.$ENV{'form.request.prefix'}.'lonhomework method="POST" action="'.$request->uri.'">');            hwkmenu=window.open("/res/adm/pages/homeworkmenu.html","homeworkremote",
 }                   "height=350,width=150,menubar=no");
             </script>');
 sub send_footer {      }
   my ($request)= @_;  
 #  $request->print('</form>');  
   $request->print(&Apache::lontexconvert::footer());  
 }  
   
 #@Apache::lonhomework::date_status=();  
 #@Apache::lonhomework::date_msg=();  
 sub check_date {  
   my ($id) = @_;  
   my $date ='';  
   my $status = '';  
   my $datemsg = '';  
   my $lastdate = '';  
   my $temp;  
   my $type;  
   my $passed;  
   &Apache::lonxml::debug("checking for part :$id:");  
   foreach $temp ("opendate","duedate","answerdate") {  
     $lastdate = $date;  
     $date = &Apache::lonnet::EXT("resource.$id.$temp");  
     &Apache::lonxml::debug("found :$date: for :$temp:");  
     if ($date eq '') {  
       $date = "an unknown date"; $passed = 0;  
     } elsif ($date eq 'con_lost') {  
       $date = "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 = "will open on $date";  
   } elsif ($type eq 'duedate') {  
     $status='CAN_ANSWER';  
     $datemsg = "is due at $date";  
   } elsif ($type eq 'answerdate') {  
     $status='CLOSED';  
     $datemsg = "was due as $lastdate, and answers will be available at $date";  
   }  
   if ($status eq 'CAN_ANSWER') {  
     #check #tries  
     my $tries = $Apache::lonhomework::history{"resource.$id.tries"};  
     my $maxtries = &Apache::lonnet::EXT("resource.$id.maxtries");  
     if ( $tries eq '' ) { $tries = '0'; }  
     if ( $maxtries eq '' ) { $maxtries = '2'; }   
     if ($tries >= $maxtries) { $status = 'CANNOT_ANSWER'; }   
   }  
   &Apache::lonxml::debug("sending back :$status:$datemsg:");  
   if ($ENV{'request.state'} eq "construct") {  
     &Apache::lonxml::debug("in construction ignoring dates");  
     $status='CAN_ANSWER';  
     $datemsg='is in under construction';  
   }  
   return ($status,$datemsg);  
 }  }
   
 sub handler {  sub proctor_checked_in {
   my $request=$_[0];      my ($slot_name,$slot,$type)=@_;
       my @possible_proctors=split(",",$slot->{'proctor'});
       
       return 1 if (!@possible_proctors);
   
   if ( $ENV{'user.name'} eq 'albertel' ) { $Apache::lonxml::debug=1; }      my $key;
         if ($type eq 'Task') {
   my (@targets) = &get_target();   my $version=$Apache::lonhomework::history{'resource.0.version'};
    $key ="resource.$version.0.checkedin";
   if ($ENV{'browser.mathml'}) {      } elsif ($type eq 'problem') {
     $request->content_type('text/xml');   $key ='resource.0.checkedin';
   } else {      }
     $request->content_type('text/html');      # backward compatability, used to be username@domain, 
   }      # now is username:domain
   $request->send_http_header;      my $who = $Apache::lonhomework::history{$key};
   return OK if $request->header_only;      if ($who !~ /:/) {
      $who =~ tr/@/:/;
   &Apache::lonhomework::send_header($request);      }     
         foreach my $possible (@possible_proctors) { 
   #check if allowed to see   if ($who eq $possible
         && $Apache::lonhomework::history{$key.'.slot'} eq $slot_name) {
   foreach my $target (@targets) {      return 1;
     my $file=&Apache::lonnet::filelocation("",$request->uri);   }
     my $problem=&Apache::lonnet::getfile($file);      }
     if ($problem == -1) {      
       &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");      return 0;
       $problem='';  }
     }  
       $Apache::lonxml::browse='';
     my %mystyle;  sub check_ip_acc {
     my $result = '';      my ($acc)=@_;
     &Apache::inputtags::initialize_inputtags;      &Apache::lonxml::debug("acc is $acc");
     %Apache::lonhomework::results=();      if (!defined($acc) || $acc =~ /^\s*$/ || $acc =~/^\s*no\s*$/i) { 
     %Apache::lonhomework::history=&Apache::lonnet::restore;   return 1;
     #ignore error conditions      }
     my ($temp)=keys %Apache::lonhomework::history ;      my $allowed=0;
     if ($temp =~ m/^error:.*/) { %Apache::lonhomework::history=(); }       my $ip=$ENV{'REMOTE_ADDR'};
     if ($target eq 'web' && &Apache::lonnet::symbread() eq '') {      my $name;
       $request->print("Vieiwing this problem as not a student, submissions will be ignored.");      foreach my $pattern (split(',',$acc)) {
     }   $pattern =~ s/^\s*//;
     if ($target eq 'grade') {   $pattern =~ s/\s*$//;
       my $resultkey;   if ($pattern =~ /\*$/) {
       foreach $resultkey (sort keys %Apache::lonhomework::history) {      #35.8.*
  &Apache::lonxml::debug("$resultkey ---- $Apache::lonhomework::history{$resultkey}");      $pattern=~s/\*//;
       }      if ($ip =~ /^\Q$pattern\E/) { $allowed=1; }
       &Apache::lonxml::debug("\n<br>restored values^</br>\n");   } elsif ($pattern =~ /(\d+\.\d+\.\d+)\.\[(\d+)-(\d+)\]$/) {    
     }      #35.8.3.[34-56]
     my $default=&Apache::lonnet::getfile('/home/httpd/html/res/adm/includes/default_homework.lcpm');      my $low=$2;
     if ($default == -1) {      my $high=$3;
       &Apache::lonxml::error("<b>Unable to find <i>default_homework.lcpm</i></b>");      $pattern=$1;
       $default='';      if ($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_/);
     }      }
     $result = &Apache::lonxml::xmlparse($target, $problem,      
  $default.&setup_vars($target),%mystyle);      &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) {
    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
   # in lonnavmaps::resource::getDateStatus.
   sub check_access {
       my ($id) = @_;
       my $date ='';
       my $status;
       my $datemsg = '';
       my $lastdate = '';
       my $type;
       my $passed;
   
     #$request->print("Result follows:");      if ($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 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 = 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';
    my $due_date = &due_date($id);
    $datemsg=&seconds_to_human_length($due_date-time);
       }
    }
       }
   
     #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 $due_date");
       if (defined($interval)) {
    my $first_access=&Apache::lonnet::get_first_access('map',$symb);
    if (defined($first_access)) {
       $interval = $first_access+$interval;
       $date = ($interval < $due_date)? $interval : $due_date;
    } else {
       $date = $due_date;
    }
       } else {
    $date = $due_date;
       }
       return $date
   }
   
   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;
   
       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;
   
       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 {
       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 {
    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;
    }
       }
       return $error;
   }
   
   sub analyze_header {
       my ($request) = @_;
       my $result =
    &Apache::loncommon::start_page('Analyzing a problem',undef);
   
       $result .= 
    &Apache::lonxml::message_location().'
               <form name="lonhomework" method="POST" action="'.
       &HTML::Entities::encode($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);      $request->print($result);
     #$request->print(":Result ends");      $request->rflush();
     if ($target eq 'grade') {  }
   
   sub analyze_footer {
       my ($request) = @_;
       $request->print(&Apache::loncommon::end_page());
       $request->rflush();
   }
   
       my $resultkey;  sub analyze {
       foreach $resultkey (sort keys %Apache::lonhomework::results) {      my ($request,$file) = @_;
  &Apache::lonxml::debug("$resultkey ---- $Apache::lonhomework::results{$resultkey}");      &Apache::lonxml::debug("Analyze");
       }      my $result;
       &Apache::lonxml::debug("\n<br>storing values^</br>\n");      my %overall;
     }      my %seedexample;
           my %allparts;
     my ($temp) = keys %Apache::lonhomework::results;      my $rndseed=$env{'form.rndseed'};
     if ( $temp ne '' ) {      &analyze_header($request);
       &Apache::lonxml::debug("Store return message:".&Apache::lonnet::cstore(%Apache::lonhomework::results));      my %prog_state=
     }   &Apache::lonhtmlcommon::Create_PrgWin($request,&mt('Analyze Progress'),
   }        &mt('Getting Problem Variants'),
   &Apache::lonhomework::send_footer($request);        $env{'form.numtoanalyze'},
           'inline',undef);
   return OK;      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 $start_page = 
       &Apache::loncommon::start_page("EditXML $file",
      &Apache::edit::js_change_detection());
   
    $result.=$start_page.
       &renderpage($request,$file,['no_output_web'],1).
       &Apache::lonxml::message_location().'
               <form '.&Apache::edit::form_change_detection().' 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" '.&Apache::edit::submit_ask_anyway().'name="problemmode" accesskey="e" value="'.&mt('Edit').'" />
               <input type="submit" name="Undo" accesskey="u" value="'.&mt('undo').'" />
               <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').'" />
               <hr />
               ' . $xml_help . '
               <textarea '.&Apache::edit::element_change_detection().' style="width:100%" rows="'.$rows.'" cols="'.$cols.'" name="editxmltext">'.
       &HTML::Entities::encode($problem,'<>&"').'</textarea><br />
               <input type="submit" name="submit" accesskey="s" value="'.&mt('Submit Changes').'" />
               <input type="submit" name="submit" accesskey="v" value="'.&mt('Submit Changes and View').'" />
               </form>'.&Apache::loncommon::end_page();
    &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 $start_page = 
       &Apache::loncommon::start_page("Create New $extension");
    if ($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);
   $start_page
   <h1>$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>".&Apache::loncommon::end_page());
       }
       return '';
   }
   
   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
       &unset_permissions();
       $request->internal_redirect('/adm/ambiguous');
       return OK;
    }
       }
       if (&setupheader($request)) {
    &unset_permissions();
    return OK;
       }
       &Apache::lonxml::debug("Permissions:$Apache::lonhomework::browse:$Apache::lonhomework::viewgrades:$Apache::lonhomework::modifygrades:$Apache::lonhomework::queuegrade");
       &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") {
    if ( -e $file ) {
       &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
       ['problemmode']);
       if (!(defined $env{'form.problemmode'})) {
    #first visit to problem in construction space
    $env{'form.problemmode'}='View';
    &renderpage($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");
       # always turn off debug messages
       $Apache::lonxml::debug=0;
       &unset_permissions();
       return OK;
   
 }  }
   
Removed from v.1.31  
changed lines
  Added in v.1.253

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