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version 1.55, 2001/08/17 16:50:04 version 1.193, 2005/01/28 09:48:53
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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  # $Id$
 # 6/1,8/17 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 Time::HiRes qw( gettimeofday tv_interval );  use HTML::Entities();
   use Apache::loncommon();
   use Apache::lonlocal;
   use Time::HiRes qw( gettimeofday tv_interval );
   use Apache::lonnet();
   
   # FIXME - improve commenting
   
   
 sub BEGIN {  BEGIN {
   &Apache::lonxml::register_insert();      &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 $ENV{'form.submitted'}) {      if( defined($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 (($ENV{'request.state'} eq "published") ||
     if ( defined $ENV{'form.preview'}) {   ($ENV{'request.state'} eq "uploaded")) {
       if ( defined $ENV{'form.submitted'}) {   if ( defined($ENV{'form.grade_target'}  ) 
  return ('grade', 'web');       && ($ENV{'form.grade_target'} eq 'tex')) {
       } else {      return ($ENV{'form.grade_target'});
  return ('web');   } elsif ( defined($ENV{'form.grade_target'}  ) 
       }    && ($Apache::lonhomework::viewgrades eq 'F' )) {
     } else {      return ($ENV{'form.grade_target'});
       if ( $ENV{'form.problemmode'} eq 'View' ) {   }
  if ( defined $ENV{'form.submitted'}) {  
   return ('grade', 'web');   if ( defined($ENV{'form.submitted'}) &&
        ( !defined($ENV{'form.resetdata'})) &&
        ( !defined($ENV{'form.newrandomization'}))) {
       return ('grade', 'web');
  } else {   } else {
   return ('web');      return ('web');
    }
       } elsif ($ENV{'request.state'} eq "construct") {
    if ( defined($ENV{'form.grade_target'}) ) {
       return ($ENV{'form.grade_target'});
  }   }
       } elsif ( $ENV{'form.problemmode'} eq 'Edit' ) {   if ( defined($ENV{'form.preview'})) {
  if ( $ENV{'form.submitted'} eq 'edit' ) {      if ( defined($ENV{'form.submitted'})) {
   return ('modified','edit');   return ('grade', 'web');
       } else {
    return ('web');
       }
  } else {   } else {
   return ('edit');      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','edit');
       }
    } else {
       return ('edit');
    }
       } else {
    return ('web');
       }
  }   }
       } else {  
  return ('web');  
       }  
     }      }
   }      return ();
   return ();  
 }  }
   
 sub setup_vars {  sub setup_vars {
   my ($target) = @_;      my ($target) = @_;
   return ';'      return ';'
 #  return ';$external::target='.$target.';';  #  return ';$external::target='.$target.';';
 }  }
   
 sub send_header {  sub send_header {
   my ($request)= @_;      my ($request)= @_;
   $request->print(&Apache::lontexconvert::header());      $request->print(&Apache::lontexconvert::header());
 #  $request->print('<form name='.$ENV{'form.request.prefix'}.'lonhomework method="POST" action="'.$request->uri.'">');  #  $request->print('<form name='.$ENV{'form.request.prefix'}.'lonhomework method="POST" action="'.$request->uri.'">');
 }  }
   
 sub createmenu {  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 send_footer {
   my ($request)= @_;      my ($request)= @_;
 #  $request->print('</form>');  #  $request->print('</form>');
   $request->print(&Apache::lontexconvert::footer());      $request->print(&Apache::lontexconvert::footer());
 }  }
   
 $Apache::lonxml::browse='';  $Apache::lonxml::browse='';
   
   sub check_ip_acc {
       my ($acc)=@_;
       if (!defined($acc) || $acc =~ /^\s*$/) { return 1; }
       my $allowed=0;
       my $ip=$ENV{'REMOTE_ADDR'};
       my $name;
       foreach my $pattern (split(',',$acc)) {
    if ($pattern =~ /\*$/) {
       #35.8.*
       $pattern=~s/\*//;
       if ($ip =~ /^\Q$pattern\E/) { $allowed=1; }
    } elsif ($pattern =~ /(\d+\.\d+\.\d+)\.\[(\d+)-(\d+)\]$/) {    
       #35.8.3.[34-56]
       my $low=$2;
       my $high=$3;
       $pattern=$1;
       if ($ip =~ /^\Q$pattern\E/) { 
    my $last=(split(/\./,$ip))[3];
    if ($last <=$high && $last >=$low) { $allowed=1; }
       }
    } elsif ($pattern =~ /^\*/) {
       #*.msu.edu
       $pattern=~s/\*//;
       if (!defined($name)) {
    use Socket;
    my $netaddr=inet_aton($ip);
    ($name)=gethostbyaddr($netaddr,AF_INET);
       }
       if ($name =~ /\Q$pattern\E$/i) { $allowed=1; }
    } elsif ($pattern =~ /\d+\.\d+\.\d+\.\d+/) {
       #127.0.0.1
       if ($ip =~ /^\Q$pattern\E/) { $allowed=1; }
    } else {
       #some.name.com
       if (!defined($name)) {
    use Socket;
    my $netaddr=inet_aton($ip);
    ($name)=gethostbyaddr($netaddr,AF_INET);
       }
       if ($name =~ /\Q$pattern\E$/i) { $allowed=1; }
    }
    if ($allowed) { last; }
       }
       return $allowed;
   }
   # JB, 9/24/2002: Any changes in this function may require a change
   # in lonnavmaps::resource::getDateStatus.
 sub check_access {  sub check_access {
   my ($id) = @_;      my ($id) = @_;
   my $date ='';      my $date ='';
   my $status = '';      my $status;
   my $datemsg = '';      my $datemsg = '';
   my $lastdate = '';      my $lastdate = '';
   my $temp;      my $temp;
   my $type;      my $type;
   my $passed;      my $passed;
   &Apache::lonxml::debug("checking for part :$id:");  
   foreach $temp ("opendate","duedate","answerdate") {      if ($ENV{'request.state'} eq "construct") {
     $lastdate = $date;   if ($ENV{'form.problemstate'}) {
     $date = &Apache::lonnet::EXT("resource.$id.$temp");      if ($ENV{'form.problemstate'} =~ /^CANNOT_ANSWER/) {
     &Apache::lonxml::debug("found :$date: for :$temp:");   if ( ! ($ENV{'form.problemstate'} eq 'CANNOT_ANSWER_correct' &&
     if ($date eq '') {   lc($Apache::lonhomework::problemstatus) eq 'no')) {
       $date = "an unknown date"; $passed = 0;      return ('CANNOT_ANSWER',
     } elsif ($date eq 'con_lost') {      &mt('is in this state due to author settings.'));
       $date = "an indeterminate date"; $passed = 0;   }
     } else {      } else {
       if (time < $date) { $passed = 0; } else { $passed = 1; }   return ($ENV{'form.problemstate'},
       $date = localtime $date;   &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,$datemsg);
     }      }
     if (!$passed) { $type=$temp; last; }  
   }      &Apache::lonxml::debug("checking for part :$id:");
   &Apache::lonxml::debug("have :$type:$passed:");      &Apache::lonxml::debug("time:".time);
   if ($passed) {  
     $status='SHOW_ANSWER';      if ($ENV{'request.state'} ne "construct") {
     $datemsg=$date;   my $allowed=&check_ip_acc(&Apache::lonnet::EXT("resource.$id.acc"));
   } elsif ($type eq 'opendate') {   if (!$allowed && ($Apache::lonhomework::browse ne 'F')) {
     $status='CLOSED';      $status='INVALID_ACCESS';
     $datemsg = "will open on $date";      $date=&mt("can not be accessed from your location.");
   } elsif ($type eq 'duedate') {      return($status,$date);
     $status='CAN_ANSWER';   }
     $datemsg = "is due at $date";  
   } elsif ($type eq 'answerdate') {   foreach $temp ("opendate","duedate","answerdate") {
     $status='CLOSED';      $lastdate = $date;
     $datemsg = "was due on $lastdate, and answers will be available on $date";      $date = &Apache::lonnet::EXT("resource.$id.$temp");
   }      my $thistype = &Apache::lonnet::EXT("resource.$id.$temp.type");
   if ($status eq 'CAN_ANSWER') {      if ($thistype =~ /^(con_lost|no_such_host)/ ||
     #check #tries   $date     =~ /^(con_lost|no_such_host)/) {
     my $tries = $Apache::lonhomework::history{"resource.$id.tries"};   $status='UNAVAILABLE';
     my $maxtries = &Apache::lonnet::EXT("resource.$id.maxtries");   $date=&mt("may open later.");
     if ( $tries eq '' ) { $tries = '0'; }   return($status,$date);
     if ( $maxtries eq '' ) { $maxtries = '2'; }       }
     if ($tries >= $maxtries) { $status = 'CANNOT_ANSWER'; }       if ($thistype eq 'date_interval') {
   }   if ($temp eq 'opendate') {
       $date=&Apache::lonnet::EXT("resource.$id.duedate")-$date;
   if (($status ne 'CLOSED') && ($Apache::lonhomework::type eq 'exam')) {   }
       return ('UNCHECKEDOUT','needs to be checked out');   if ($temp eq 'answerdate') {
   }      $date=&Apache::lonnet::EXT("resource.$id.duedate")+$date;
    }
       }
   &Apache::lonxml::debug("sending back :$status:$datemsg:");      &Apache::lonxml::debug("found :$date: for :$temp:");
   if (($Apache::lonhomework::browse eq 'F') && ($status eq 'CLOSED')) {      if ($date eq '') {
     &Apache::lonxml::debug("should be allowed to browse a resource when closed");   $date = &mt("an unknown date"); $passed = 0;
     $status='CAN_ANSWER';      } elsif ($date eq 'con_lost') {
     $datemsg='is closed but you are allowed to view it';   $date = &mt("an indeterminate date"); $passed = 0;
   }      } else {
   if ($ENV{'request.state'} eq "construct") {   if (time < $date) { $passed = 0; } else { $passed = 1; }
     &Apache::lonxml::debug("in construction ignoring dates");   $date = localtime $date;
     $status='CAN_ANSWER';      }
     $datemsg='is in under construction';      if (!$passed) { $type=$temp; last; }
   }   }
   return ($status,$datemsg);   &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') {
    #check #tries, and if correct.
    my $tries = $Apache::lonhomework::history{"resource.$id.tries"};
    my $maxtries = &Apache::lonnet::EXT("resource.$id.maxtries");
    if ( $tries eq '' ) { $tries = '0'; }
    if ( $maxtries eq '' && 
        $ENV{'request.state'} ne 'construct') { $maxtries = '2'; } 
    if ($maxtries && $tries >= $maxtries) { $status = 'CANNOT_ANSWER'; }
    # if (correct and show prob status) or excused then CANNOT_ANSWER
    if(($Apache::lonhomework::history{"resource.$id.solved"}=~/^correct/
       &&
       lc($Apache::lonhomework::problemstatus) ne 'no')
      ||
      $Apache::lonhomework::history{"resource.$id.solved"}=~/^excused/) {
       $status = 'CANNOT_ANSWER';
    }
       }
       if ($status eq 'CAN_ANSWER' || $status eq 'CANNOT_ANSWER') {
    my $interval=&Apache::lonnet::EXT("resource.$id.interval");
    &Apache::lonxml::debug("looking for interval $interval");
    if ($interval) {
       my $first_access=&Apache::lonnet::get_first_access('map');
       &Apache::lonxml::debug("looking for accesstime $first_access");
       if (!$first_access) {
    $status='NOT_YET_VIEWED';
    $datemsg=&seconds_to_human_length($interval);
       } else {
    my $newdate=localtime($first_access+$interval);
    if (time > ($first_access+$interval)) {
       $status='CLOSED';
       $datemsg = &mt("was due on")." $newdate".&mt(", and answers will be available on")." $date";
    } else {
       $datemsg = &mt("is due at")." $newdate";
    }
       }
    }
       }
     #if (($status ne 'CLOSED') && ($Apache::lonhomework::type eq 'exam') &&
     #    (!$Apache::lonhomework::history{"resource.0.outtoken"})) {
     #    return ('UNCHECKEDOUT','needs to be checked out');
     #}
   
   
       &Apache::lonxml::debug("sending back :$status:$datemsg:");
       if (($Apache::lonhomework::browse eq 'F') && ($status eq 'CLOSED')) {
    &Apache::lonxml::debug("should be allowed to browse a resource when closed");
    $status='CAN_ANSWER';
    $datemsg=&mt('is closed but you are allowed to view it');
       }
   
       return ($status,$datemsg);
   }
   
   sub seconds_to_human_length {
       my ($length)=@_;
   
       my $seconds=$length%60; $length=int($length/60);
       my $minutes=$length%60; $length=int($length/60);
       my $hours=$length%24;   $length=int($length/24);
       my $days=$length;
   
       my $timestr;
       if ($days > 0) { $timestr.=&mt('[quant,_1,day]',$days); }
       if ($hours > 0) { $timestr.=($timestr?", ":"").
     &mt('[quant,_1,hour]',$hours); }
       if ($minutes > 0) { $timestr.=($timestr?", ":"").
       &mt('[quant,_1,minute]',$minutes); }
       if ($seconds > 0) { $timestr.=($timestr?", ":"").
       &mt('[quant,_1,second]',$seconds); }
       return $timestr;
 }  }
   
 sub showhash {  sub showhash {
   my (%hash) = @_;      my (%hash) = @_;
   my $resultkey;      &showhashsubset(\%hash,'.');
   foreach $resultkey (sort keys %hash) {      return '';
     &Apache::lonxml::debug("$resultkey ---- $hash{$resultkey}");  }
   }  
   &Apache::lonxml::debug("\n<br />restored values^</br>\n");  sub showarray {
   return '';      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 {  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 = $viewgrades; # File global variable...dirt.
       if ($Apache::lonhomework::browse eq 'F' && 
    $ENV{'form.devalidatecourseresdata'} eq 'on') {
    my (undef,$courseid) = &Apache::lonxml::whichuser();
    &Apache::lonnet::devalidatecourseresdata($ENV{"course.$courseid.num"},
         $ENV{"course.$courseid.domain"});
       }
       return ''
 }  }
   
 sub setupheader {  sub setupheader {
   my $request=$_[0];      my $request=$_[0];
   if ($ENV{'browser.mathml'}) {      if ($ENV{'browser.mathml'}) {
     $request->content_type('text/xml');   &Apache::loncommon::content_type($request,'text/xml');
   } else {      } else {
     $request->content_type('text/html');   &Apache::loncommon::content_type($request,'text/html');
   }      }
   $request->send_http_header;      if (!$Apache::lonxml::debug && ($ENV{'REQUEST_METHOD'} eq 'GET')) {
   return OK if $request->header_only;   &Apache::loncommon::no_cache($request);
   return ''      }
       $request->send_http_header;
       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 $fileout = &Apache::lonnet::filelocation("",$request->uri);      my $file    = &Apache::lonnet::filelocation("",$request->uri);
   my $filesave=$fileout.".bak";      my $filebak =$file.".bak";
       my $filetmp =$file.".tmp";
   if ($ENV{'form.Undo'} eq 'undo') {      my $error=0;
     if (copy($filesave,$fileout)) {  
       $request->print("<b>Undid changes, Copied $filesave to $fileout<br /></b>");      &Apache::lonnet::correct_line_ends($result);
   
       if ($ENV{'form.Undo'} eq &mt('undo')) {
    my $error=0;
    if (!copy($file,$filetmp)) { $error=1; }
    if ((!$error) && (!copy($filebak,$file))) { $error=1; }
    if ((!$error) && (!move($filetmp,$filebak))) { $error=1; }
    if (!$error) {
       &Apache::lonxml::info("<p><b>".&mt("Undid changes, Switched")." $filebak ".&mt("and")." $file</b></p>");
    } else {
       &Apache::lonxml::info("<p><font color=\"red\" size=\"+1\"><b>".&mt("Unable to undo, unable to switch")." $filebak ".&mt("and")." $file</b></font></p>");
       $error=1;
    }
     } else {      } else {
       $request->print("<font color=\"red\" size=\"+1\"><b>Unable to undo, unable to copy $filesave to $fileout<br /></b></font>");   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;
    }
     }      }
   } else {      return $error;
     my $fs=Apache::File->new(">$filesave");  }
     if (defined($fs)) {  
       print $fs $$problem;  sub analyze_header {
       $request->print("<b>Making Backup to $filesave</b><br />");      my ($request) = @_;
     } else {      my $bodytag='<body bgcolor="#ffffff">';
       $request->print("<font color=\"red\" size=\"+1\"><b>Unable to make backup $filesave</b></font>");      if ($ENV{'environment.remote'} eq 'off') {
    $bodytag=&Apache::loncommon::bodytag();
       }
       my $result.='<html>
               <head><title>'.&mt("Analyzing a problem").'</title></head>
               '.$bodytag.&Apache::lonxml::message_location().'
               <form name="lonhomework" method="POST" action="'.
       &HTML::Entities::encode($ENV{'request.uri'},'<>&"').'">'.
       &Apache::structuretags::remember_problem_state().'
               <input type="submit" name="problemmode" value="'.&mt("EditXML").'" />
               <input type="submit" name="problemmode" value="'.&mt('Edit').'" />
               <hr />
               <input type="submit" name="submit" value="'.&mt("View").'" />
               <hr />
               </form>';
       &Apache::lonxml::add_messages(\$result);
       $request->print($result);
       $request->rflush();
   }
   
   sub analyze_footer {
       my ($request) = @_;
       my $result='</body></html>';
       $request->print($result);
       $request->rflush();
   }
   
   sub analyze {
       my ($request,$file) = @_;
       &Apache::lonxml::debug("Analyze");
       my $result;
       my %overall;
       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 $subresult=&Apache::lonnet::ssi($request->uri,
      ('grade_target' => 'analyze'),
      ('rndseed' => $i+$rndseed));
    (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'   ) {
    push( @{ $overall{$part.'.answer'} },
         [@{ $analyze{$part.'.answer'} }]);
       }
    }
     }      }
     my $fh=Apache::File->new(">$fileout");      &Apache::lonhtmlcommon::Update_PrgWin($request,\%prog_state,
     if (defined($fh)) {    &mt('Analyzing Results'));
       print $fh $$result;      $request->print('<hr />'.&mt('List of possible answers').': ');
       $request->print("<b>Saving Modifications to $fileout</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 $fileout</b></font>");      my $num_cols=scalar(@{ $overall{$part.'.answer'}->[0] });
       $request->print('<table><tr><th colspan="'.($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').'</th></tr>');
       foreach my $answer (sort {(split("\0",$a))[0] <=> (split("\0",$b))[0]} (keys(%frequency))) {
    $request->print('<tr><td align="right">'.
    join('</td><td align="right">',split("\0",$answer)).
    '</td><td>('.$frequency{$answer}.
    ')</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 ) {
    $request->print('<p>'.&mt('Found no analyzable respones in this problem, currently only Numerical, Formula and String response styles are supported.').'</p>');
     }      }
   }      &Apache::lonhtmlcommon::Close_PrgWin($request,\%prog_state);
       &analyze_footer($request);
       &Apache::lonhomework::showhash(%overall);
       return $result;
 }  }
   
 sub renderpage {  sub editxmlmode {
   my ($request,$file) = @_;      my ($request,$file) = @_;
       my $result;
   my (@targets) = &get_target();  
   foreach my $target (@targets) {  
     #my $t0 = [&gettimeofday()];  
     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>");
     }   $problem='';
       }
     my %mystyle;      if (defined($ENV{'form.editxmltext'}) || defined($ENV{'form.Undo'})) {
     my $result = '';   my $error=&handle_save_or_undo($request,\$problem,
     &Apache::inputtags::initialize_inputtags;         \$ENV{'form.editxmltext'});
     &Apache::edit::initialize_edit;   if (!$error) { $problem=&Apache::lonnet::getfile($file); }
     %Apache::lonhomework::results=();      }
     %Apache::lonhomework::history=&Apache::lonnet::restore();      &Apache::lonhomework::showhashsubset(\%ENV,'^form');
     #ignore error conditions      if ( $ENV{'form.submit'} eq &mt('Submit Changes and View') ) {
     my ($temp)=keys %Apache::lonhomework::history ;   &Apache::lonhomework::showhashsubset(\%ENV,'^form');
     if ($temp =~ m/^error:.*/) { %Apache::lonhomework::history=(); }    $ENV{'form.problemmode'}='View';
     if ($target eq 'web') {   &renderpage($request,$file);
       if (&Apache::lonnet::symbread() eq '') {  
  if ($ENV{'request.state'} eq "construct") {  
   $request->print("In construction space, submissions ignored<br />");  
  } else {  
   $request->print("Browsing or <a href=\"/adm/ambiguous\">ambiguous</a> reference, submissions ignored<br />");  
  }  
       }  
       #if ($Apache::lonhomework::viewgrades eq 'F') {&createmenu('grade',$request); }  
     }  
     if ($target eq 'grade') { &showhash(%Apache::lonhomework::history); }  
   
     my $default=&Apache::lonnet::getfile('/home/httpd/html/res/adm/includes/default_homework.lcpm');  
     if ($default == -1) {  
       &Apache::lonxml::error("<b>Unable to find <i>default_homework.lcpm</i></b>");  
       $default='';  
     }  
     $result = &Apache::lonxml::xmlparse($target, $problem,  
  $default.&setup_vars($target),%mystyle);  
   
     #$request->print("Result follows:");  
     if ($target eq 'modified') {  
       &handle_save_or_undo($request,\$problem,\$result);  
     } else {      } else {
       #my $td=&tv_interval($t0);   my ($rows,$cols) = &Apache::edit::textarea_sizes(\$problem);
       #if ( $Apache::lonxml::debug) {   my $xml_help = '<table><tr><td>'.
  #$result =~ s:</body>::;      &Apache::loncommon::helpLatexCheatsheet("Problem_Editor_XML_Index",
  #$result.="<br />Spent $td seconds processing target $target\n</body>";      "Problem Editing Help").
       #}      '</td><td>'.
       $request->print($result);         &Apache::loncommon::help_open_menu('',undef,undef,undef,5,'Authoring').
     }                  '</td></tr></table>';
     #$request->print(":Result ends");   if ($cols > 80) { $cols = 80; }
     if ($target eq 'grade') { &showhash(%Apache::lonhomework::results); }   if ($cols < 70) { $cols = 70; }
    if ($rows < 20) { $rows = 20; }
     #store new values   my $bodytag='<body bgcolor="#ffffff">';
     my ($temp) = keys %Apache::lonhomework::results;   if ($ENV{'environment.remote'} eq 'off') {
     if ( $temp ne '' ) {      $bodytag=&Apache::loncommon::bodytag();
       &Apache::lonxml::debug("Store return message:".   }
      &Apache::lonnet::cstore(\%Apache::lonhomework::results));   $result.='<html>'.$bodytag.&Apache::lonxml::message_location().'
               <form name="lonhomework" method="POST" action="'.
       &HTML::Entities::encode($ENV{'request.uri'},'<>&"').'">'.
       &Apache::structuretags::remember_problem_state().'
               <input type="hidden" name="problemmode" value="'.&mt('EditXML').'" />
               <input type="submit" name="problemmode" accesskey="d" value="'.&mt('Discard Edits and View').'" />
               <input type="submit" name="problemmode" accesskey="e" value="'.&mt('Edit').'" />
               <hr />
               <input type="submit" name="submit" accesskey="s" value="'.&mt('Submit Changes').'" />
               <input type="submit" name="submit" accesskey="v" value="'.&mt('Submit Changes and View').'" />
               <input type="submit" name="Undo" accesskey="u" value="'.&mt('undo').'" />
               <hr />
               ' . $xml_help . '
               <textarea rows="'.$rows.'" cols="'.$cols.'" name="editxmltext">'.
       &HTML::Entities::encode($problem,'<>&"').'</textarea>
               </form></body></html>';
    &Apache::lonxml::add_messages(\$result);
    $request->print($result);
       }
       return '';
   }
   
   #
   #    Render the page in whatever target desired.
   #
   sub renderpage {
       my ($request,$file) = @_;
   
       my (@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 $problem=&Apache::lonnet::getfile($file);
    if ($problem eq -1) {
       &Apache::lonxml::error("<b> ".&mt('Unable to find')." <i>$file</i></b>");
       $problem='';
    }
   
    my %mystyle;
    my $result = '';
    if ($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($Apache::lonhomework::parsing_a_problem);
    #$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);
     }      }
     #my $td=&tv_interval($t0);      &Apache::lonxml::add_messages(\$overall_result);
   }      $request->print($overall_result);   
       $request->rflush();   
 }  }
   
 # with no arg it returns a HTML <option> list of the template titles  # 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  # with one arg it returns the filename associated with the arg passed
 sub get_template_list {  sub get_template_list {
   my ($namewanted,$extension) = @_;      my ($namewanted,$extension) = @_;
   my $result;      my $result;
   &Apache::lonxml::debug("Looking for :$extension:");      my @allnames;
   foreach my $file (</home/httpd/html/res/adm/includes/templates/*.$extension>) {      &Apache::lonxml::debug("Looking for :$extension:");
     my $name=&Apache::lonnet::metadata($file,'title');      foreach my $file (</home/httpd/html/res/adm/includes/templates/*.$extension>) {
     if ($namewanted && ($name eq $namewanted)) {   my $name=&Apache::lonnet::metadata($file,'title');
       $result=$file;   if ($namewanted && ($name eq $namewanted)) {
       last;      $result=$file;
     } else {      last;
       $result.="<option>$name</option>";   } else {
       if ($name) { push (@allnames, $name); }
    }
     }      }
   }      if (@allnames && !$result) {
   return $result;   $result="<option>".&mt("Select a")." $extension ".&mt('template')."</option>\n<option>".
       join('</option><option>',sort(@allnames)).'</option>';
       }
       return $result;
 }  }
   
 sub newproblem {  sub newproblem {
   my ($request) = @_;      my ($request) = @_;
       my $extension=$request->uri;
   my $extension=$request->uri;      $extension=~s:^.*\.([\w]+)$:$1:;
   $extension=~s:^.*\.([\w]+)$:$1:;      &Apache::lonxml::debug("Looking for :$extension:");
   &Apache::lonxml::debug("Looking for :$extension:");  
   if ($ENV{'form.template'}) {  
     use File::Copy;  
     my $file = &get_template_list($ENV{'form.template'},$extension);  
     my $dest = &Apache::lonnet::filelocation("",$request->uri);  
     copy($file,$dest);  
     &renderpage($request,$file);  
   } else {  
     my $templatelist=&get_template_list('',$extension);      my $templatelist=&get_template_list('',$extension);
     my $url=$request->uri;      if ($ENV{'form.template'} &&
     my $dest = &Apache::lonnet::filelocation("",$request->uri);   $ENV{'form.template'} ne "Select a $extension template") {
     $request->print(<<ENDNEWPROBLEM);   use File::Copy;
 <body bgcolor="#FFFFFF">   my $file = &get_template_list($ENV{'form.template'},$extension);
 The request file $url doesn\'t exist. You can create a new $extension <br />   my $dest = &Apache::lonnet::filelocation("",$request->uri);
 <form action="$url" method="POST">   copy($file,$dest);
 <input type="submit" value="New $extension"><br />   &renderpage($request,$dest);
 <select name="template">      } elsif($ENV{'form.newfile'} && !$templatelist) {
 $templatelist   # I don't like hard-coded filenames but for now, this will work.
 </select>   use File::Copy;
 </form>   my $templatefilename =
 </body>      $request->dir_config('lonIncludes').'/templates/blank.problem';
    &Apache::lonxml::debug("$templatefilename");
    my $dest = &Apache::lonnet::filelocation("",$request->uri);
    copy($templatefilename,$dest);
    &renderpage($request,$dest);
       } else {
    my $url=&HTML::Entities::encode($request->uri,'<>&"');
    my $shownurl=$url;
    $shownurl=~s-^/~-/priv/-;
    my $dest = &Apache::lonnet::filelocation("",$request->uri);
    my $errormsg;
    if ($ENV{'form.newfile'}) {
       $errormsg='<p><font color="red">'.&mt('You did not select a template.').'</font></p>'."\n";
    }
    my $instructions;
    my $bodytag=&Apache::loncommon::bodytag(undef,undef,undef,
    ($ENV{'environment.remote'} ne 'off'));
    if ($templatelist) { $instructions=&mt(", select a template from the pull-down menu below.").'<br />'.&mt("Then");}
    my %lt=&Apache::lonlocal::texthash( 'create' => 'Creating a new',
     'resource' => 'resource',
     'requested' => 'The requested file',
     'not exist' => 'currently does not exist',
     'createnew' => 'To create a new',
     'click' => 'click on the',
     'Create' => 'Create',
     'button' => 'button');
    $request->print(<<ENDNEWPROBLEM);
   $bodytag
   <h1>$lt{'create'} $extension $lt{'resource'}</h1>
   $errormsg
   $lt{'requested'} <tt>$shownurl</tt> $lt{'not exist'}.
   <p>
   <b>$lt{'createnew'} $extension$instructions $lt{'click'} "$lt{'Create'} $extension" $lt{'button'}.</b>
   </p>
   <p><form action="$url" method="POST">
 ENDNEWPROBLEM  ENDNEWPROBLEM
   }   if (defined($templatelist)) {
       $request->print("<select name=\"template\">$templatelist</select>");
   return '';   }
    $request->print("<br /><input type=\"submit\" name=\"newfile\" value=\"".&mt('Create')." $extension\" />");
    $request->print("</form></p></body>");
       }
       return '';
 }  }
   
 sub view_or_edit_menu {  sub view_or_edit_menu {
   my ($request) = @_;      my ($request) = @_;
   my $url=$request->uri;      my $url=&HTML::Entities::encode($request->uri,'<>&"');
   $request->print(<<EDITMENU);      my %lt=&Apache::lonlocal::texthash( 'would' => 'Would you like to',
         'view' => 'View',
         'Edit' => 'edit',
         'or' => 'or',
         'the problem' => 'the problem');
       $request->print(<<EDITMENU);
 <body bgcolor="#FFFFFF">  <body bgcolor="#FFFFFF">
 <form action="$url" method="POST">  <form action="$url" method="POST">
 Would you like to <input type="submit" name="problemmode" value="View"> or  $lt{'would'} <input type="submit" name="problemmode" accesskey="v" value="&lt{'view'}">
 <input type="submit" name="problemmode" value="Edit"> the problem.  &lt{'or'} <input type="submit" name="problemmode" accesskey="e" value="&lt{'Edit'}">
   &lt{'the problem'}.
 </form>  </form>
 </body>  </body>
 EDITMENU  EDITMENU
 }  }
   
 sub handler {  sub handler {
   #my $t0 = [&gettimeofday()];      #my $t0 = [&gettimeofday()];
   my $request=$_[0];      my $request=$_[0];
       
   if ( $ENV{'user.name'} eq 'albertel' ) {$Apache::lonxml::debug=1;}      $Apache::lonxml::debug=$ENV{'user.debug'};
       $ENV{'request.uri'}=$request->uri;
   if (&setupheader($request)) { return OK; }      &setuppermissions();
   $ENV{'request.uri'}=$request->uri;      # some times multiple problemmodes are submitted, need to select
       # the last one
   #setup permissions      if ( defined($ENV{'form.problemmode'}) && ref($ENV{'form.problemmode'}) ) {
   $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});   my $mode=$ENV{'form.problemmode'}->[-1];
   $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});   undef $ENV{'form.problemmode'};
   &Apache::lonxml::debug("Permissions:$Apache::lonhomework::browse:$Apache::lonhomework::viewgrades:");   $ENV{'form.problemmode'}=$mode;
       }
   my $file=&Apache::lonnet::filelocation("",$request->uri);  
       my $file=&Apache::lonnet::filelocation("",$request->uri);
   #check if we know where we are  
   if ($ENV{'request.course.fn'} && !&Apache::lonnet::symbread()) {       #check if we know where we are
     # if we are browsing we might not be able to know where we are      if ($ENV{'request.course.fn'} && !&Apache::lonnet::symbread()) { 
     if ($Apache::lonhomework::browse ne 'F') {   # if we are browsing we might not be able to know where we are
       #should know where we are, so ask   if ($Apache::lonhomework::browse ne 'F' && 
       $request->internal_redirect('/adm/ambiguous'); return;      $ENV{'request.state'} ne "construct") {
     }      #should know where we are, so ask
   }      if ( &Apache::lonnet::mod_perl_version() == 2 ) {
    &Apache::lonnet::cleanenv();
   if ($ENV{'request.state'} eq "construct") {      }
     if ( -e $file ) {      &Apache::lonnet::logthis(&Apache::lonnet::mod_perl_version());
       if (!(defined $ENV{'form.problemmode'})) {      $request->internal_redirect('/adm/ambiguous'); return OK;
  #first visit to problem in construction space   }
  &view_or_edit_menu($request);      }
  #&renderpage($request,$file);      if (&setupheader($request)) { return OK; }
       } else {      &Apache::lonxml::debug("Permissions:$Apache::lonhomework::browse:$Apache::lonhomework::viewgrades:");
  &renderpage($request,$file);      &Apache::lonxml::debug("Problem Mode ".$ENV{'form.problemmode'});
       }      my ($symb) = &Apache::lonxml::whichuser();
       &Apache::lonxml::debug('symb is '.$symb);
       if ($ENV{'request.state'} eq "construct" || $symb eq '') {
    if ($ENV{'form.resetdata'} eq &mt('Reset Submissions') ||
       $ENV{'form.resetdata'} eq &mt('New Problem Variation') ||
       $ENV{'form.newrandomization'} eq &mt('New Randomization')) {
       my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
       &Apache::lonnet::tmpreset($symb,'',$domain,$name);
       &Apache::lonxml::debug("Attempt reset");
    }
       }
       if ($ENV{'request.state'} eq "construct") {
    if ( -e $file ) {
       &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
       ['problemmode']);
       if (!(defined $ENV{'form.problemmode'})) {
    #first visit to problem in construction space
    #&view_or_edit_menu($request);
    $ENV{'form.problemmode'}='View';
    &renderpage($request,$file);
       } elsif ($ENV{'form.problemmode'} eq &mt('EditXML') ||
        $ENV{'form.problemmode'} eq 'EditXML') {
    &editxmlmode($request,$file);
       } elsif ($ENV{'form.problemmode'} eq &mt('Calculate answers')) {
    &analyze($request,$file);
       } else {
    &renderpage($request,$file);
       }
    } else {
       # requested file doesn't exist in contruction space
       &newproblem($request);
    }
     } else {      } else {
       # requested file doesn't exist in contruction space   # just render the page normally outside of construction space
       &newproblem($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 $td seconds processing");
     &renderpage($request,$file);      # &Apache::lonhomework::send_footer($request);
   }      # always turn off debug messages
   #my $td=&tv_interval($t0);      $Apache::lonxml::debug=0;
   #&Apache::lonxml::debug("Spent $td seconds processing");      return OK;
   # &Apache::lonhomework::send_footer($request);  
   # always turn off debug messages  
   $Apache::lonxml::debug=0;  
   return OK;  
   
 }  }
   
Removed from v.1.55  
changed lines
  Added in v.1.193

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.