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version 1.15, 2000/11/07 17:21:18 version 1.96, 2002/10/16 19:22:31
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   # The LearningOnline Network with CAPA
 # The LON-CAPA Homework handler  # The LON-CAPA Homework handler
   #
   # $Id$
   #
   # Copyright Michigan State University Board of Trustees
   #
   # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
   #
   # LON-CAPA is free software; you can redistribute it and/or modify
   # it under the terms of the GNU General Public License as published by
   # the Free Software Foundation; either version 2 of the License, or
   # (at your option) any later version.
   #
   # LON-CAPA is distributed in the hope that it will be useful,
   # but WITHOUT ANY WARRANTY; without even the implied warranty of
   # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   # GNU General Public License for more details.
   #
   # You should have received a copy of the GNU General Public License
   # along with LON-CAPA; if not, write to the Free Software
   # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   #
   # /home/httpd/html/adm/gpl.txt
   #
   # http://www.lon-capa.org/
   #
 # Guy Albertelli  # 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::inputtags;  use Apache::lonplot();
 use Apache::structuretags;  use Apache::inputtags();
 use Apache::response;  use Apache::structuretags();
   use Apache::randomlabel();
   use Apache::response();
   use Apache::hint();
   use Apache::outputtags();
   use Apache::caparesponse();
   use Apache::radiobuttonresponse();
   use Apache::optionresponse();
   use Apache::imageresponse();
   use Apache::essayresponse();
   use Apache::externalresponse();
   use Apache::Constants qw(:common);
   use HTML::Entities();
   use Apache::loncommon();
   #use Time::HiRes qw( gettimeofday tv_interval );
   
 sub handler {  BEGIN {
   my $request=shift;    &Apache::lonxml::register_insert();
     }
   my $target=&get_target();  
   $Apache::lonxml::debug=1;  sub get_target {
     if ( $ENV{'request.state'} eq "published") {
       if ( defined($ENV{'form.grade_target'}  ) 
    && ($ENV{'form.grade_target'} eq 'tex')) {
         return ($ENV{'form.grade_target'});
       } elsif ( defined($ENV{'form.grade_target'}  ) 
    && ($Apache::lonhomework::viewgrades == 'F' )) {
         return ($ENV{'form.grade_target'});
       }
    
       if ( defined($ENV{'form.submitted'})) {
         return ('grade', 'web');
       } else {
         return ('web');
       }
     } elsif ($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 'View' ||
      $ENV{'form.problemmode'} eq 'Discard Edits and View') {
    if ( defined($ENV{'form.submitted'}) &&
        (!defined($ENV{'form.resetdata'})) ) {
     return ('grade', 'web','answer');
    } else {
     return ('web','answer');
    }
         } elsif ( $ENV{'form.problemmode'} eq 'Edit' ) {
    if ( $ENV{'form.submitted'} eq 'edit' ) {
     if ( $ENV{'form.submit'} eq 'Submit Changes and View' ) {
       return ('modified','web','answer');
     } else {
       return ('modified','edit');
     }
    } else {
     return ('edit');
    }
         } else {
    return ('web');
         }
       }
     }
     return ();
   }
   
   sub setup_vars {
     my ($target) = @_;
     return ';'
   #  return ';$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 {
     my ($which,$request)=@_;
     if ($which eq 'grade') {
       $request->print('<script language="JavaScript"> 
             hwkmenu=window.open("/res/adm/pages/homeworkmenu.html","homeworkremote",
                    "height=350,width=150,menubar=no");
             </script>');
     }
   }
   
   sub send_footer {
     my ($request)= @_;
   #  $request->print('</form>');
     $request->print(&Apache::lontexconvert::footer());
   }
   
   $Apache::lonxml::browse='';
   
   # JB, 9/24/2002: Any changes in this function may require a change
   # in lonnavmaps::resource::getDateStatus.
   sub check_access {
     my ($id) = @_;
     my $date ='';
     my $status = '';
     my $datemsg = '';
     my $lastdate = '';
     my $temp;
     my $type;
     my $passed;
     &Apache::lonxml::debug("checking for part :$id:");
     &Apache::lonxml::debug("time:".time);
     foreach $temp ("opendate","duedate","answerdate") {
       $lastdate = $date;
       $date = &Apache::lonnet::EXT("resource.$id.$temp");
       my $thistype = &Apache::lonnet::EXT("resource.$id.$temp.type");
       if ($thistype 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 = "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 on $lastdate, and answers will be available on $date";
     }
     if ($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'; } 
     }
   
     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 {
     my (%hash) = @_;
     &showhashsubset(\%hash,'');
     return '';
   }
   
   sub showhashsubset {
     my ($hash,$keyre) = @_;
     my $resultkey;
     foreach $resultkey (sort keys %$hash) {
       if ($resultkey =~ /$keyre/) {
         if (ref($$hash{$resultkey})) {
    if ($$hash{$resultkey} =~ /ARRAY/ ) {
     my $string="$resultkey ---- (";
     foreach my $elm (@{ $$hash{$resultkey} }) {
       $string.="$elm,";
     }
     chop($string);
     &Apache::lonxml::debug("$string)");
    } else {
     &Apache::lonxml::debug("$resultkey ---- $$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'});
     $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
     return ''
   }
   
   sub setupheader {
     my $request=$_[0];
   if ($ENV{'browser.mathml'}) {    if ($ENV{'browser.mathml'}) {
     $request->content_type('text/xml');      $request->content_type('text/xml');
   } else {    } else {
     $request->content_type('text/html');      $request->content_type('text/html');
   }    }
     if (!$Apache::lonxml::debug && ($ENV{'REQUEST_METHOD'} eq 'GET')) {
       &Apache::loncommon::no_cache($request);
     }
   $request->send_http_header;    $request->send_http_header;
   return 'OK' if $request->header_only;    return OK if $request->header_only;
     return ''
   }
   
   &Apache::lonhomework::send_header($request);  sub handle_save_or_undo {
   my $file = &Apache::lonnet::filelocation("",$request->uri);    my ($request,$problem,$result) = @_;
   my %mystyle;    my $file    = &Apache::lonnet::filelocation("",$request->uri);
   my $result = '';    my $filebak =$file.".bak";
   &Apache::inputtags::initialize_inputtags;    my $filetmp =$file.".tmp";
     my $error=0;
   
     if ($ENV{'form.Undo'} eq '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) {
         $request->print("<p><b>Undid changes, Switched $filebak and $file</b></p>");
       } else {
         $request->print("<p><font color=\"red\" size=\"+1\"><b>Unable to undo, unable to switch $filebak and $file</b></font></p>");
         $error=1;
       }
     } else {
       my $fs=Apache::File->new(">$filebak");
       if (defined($fs)) {
         print $fs $$problem;
         $request->print("<b>Making Backup to $filebak</b><br />");
       } else {
         $request->print("<font color=\"red\" size=\"+1\"><b>Unable to make backup $filebak</b></font>");
         $error=2;
       }
       my $fh=Apache::File->new(">$file");
       if (defined($fh)) {
         print $fh $$result;
         $request->print("<b>Saving Modifications to $file</b><br />");
       } else {
         $request->print("<font color=\"red\" size=\"+1\"><b>Unable to write to $file</b></font>");
         $error|=4;
       }
     }
     return $error;
   }
   
   sub analyze {
     my ($request,$file) = @_;
     &Apache::lonxml::debug("Analyze");
     my $result=&Apache::lonnet::ssi($request->uri,('grade_target' => 'analyze'));
     &Apache::lonxml::debug(":$result:");
     (my $garbage,$result)=split(/_HASH_REF__/,$result,2);
     &showhash(&Apache::lonnet::str2hash($result));
     return $result;
   }
   
   sub editxmlmode {
     my ($request,$file) = @_;
     my $result;
   my $problem=&Apache::lonnet::getfile($file);    my $problem=&Apache::lonnet::getfile($file);
   if ($problem == -1) {    if ($problem == -1) {
     &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");      &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
     $problem='';      $problem='';
   }    }
   my $default=&Apache::lonnet::getfile('/home/httpd/html/res/adm/includes/default_homework.lcpm');    if (defined($ENV{'form.editxmltext'}) || defined($ENV{'form.Undo'})) {
   if ($default == -1) {      my $error=&handle_save_or_undo($request,\$problem,
     &Apache::lonxml::error("<b>Unable to find <i>$file</i></b>");     \$ENV{'form.editxmltext'});
     $default='';      if (!$error) { $problem=&Apache::lonnet::getfile($file); }
   }    }
     &Apache::lonhomework::showhashsubset(\%ENV,'^form');
   $result = Apache::lonxml::xmlparse($target, $problem,    if ( $ENV{'form.submit'} eq 'Submit Changes and View' ) {
      $default.&setup_vars($target),%mystyle);      &Apache::lonhomework::showhashsubset(\%ENV,'^form');
   #$request->print("Result follows:");      $ENV{'form.problemmode'}='View';
   $request->print($result);      &renderpage($request,$file);
   #$request->print(":Result ends");    } else {
   &Apache::lonhomework::send_footer($request);      my ($rows,$cols) = &Apache::edit::textarea_sizes(\$problem);
   return 'OK';      my $xml_help = Apache::loncommon::help_open_topic("Problem_Editor_XML_Index");
       if ($cols > 80) { $cols = 80; }
       if ($cols < 70) { $cols = 70; }
       if ($rows < 20) { $rows = 20; }
       $result.='<html><body bgcolor="#FFFFFF">
               <form name="lonhomework" method="POST" action="'.
         $ENV{'request.uri'}.'">
               <input type="hidden" name="problemmode" value="EditXML" />
               <input type="submit" name="problemmode" value="Discard Edits and View" />
               <input type="submit" name="problemmode" value="Edit" />
               <hr />
               <input type="submit" name="submit" value="Submit Changes" />
               <input type="submit" name="submit" value="Submit Changes and View" />
               <input type="submit" name="Undo" value="undo" />
               <hr />
               ' . $xml_help . ' Problem Help<br>
               <textarea rows="'.$rows.'" cols="'.$cols.'" name="editxmltext">'.
         &HTML::Entities::encode($problem).'</textarea>
               </form></body></html>';
       $request->print($result);
     }
     return '';
 }  }
   
 sub get_target {  sub renderpage {
   if ( $ENV{'request.state'} eq "published") {    my ($request,$file) = @_;
     return 'web';  
   } elsif ($ENV{'request.state'} eq "construct") {    my (@targets) = &get_target();
     if ( defined $ENV{'form.'.$ENV{'form.request.prefix'}.'preview'}) {    &Apache::lonxml::debug("Running targets ".join(':',@targets));
       return 'web';    foreach my $target (@targets) {
       #my $t0 = [&gettimeofday()];
       my $problem=&Apache::lonnet::getfile($file);
       if ($problem == -1) {
         &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
         $problem='';
       }
   
       my %mystyle;
       my $result = '';
       &Apache::inputtags::initialize_inputtags;
       &Apache::inputtags::initialize_outputtags;
       &Apache::edit::initialize_edit;
       if ($target eq 'analyze') { %Apache::lonhomework::anaylze=(); }
       if ($target eq 'web') {
         my ($symb)=&Apache::lonxml::whichuser();
         if ($symb eq '') {
    if ($ENV{'request.state'} eq "construct") {
    } else {
             my $help = Apache::loncommon::help_open_topic("Ambiguous_Reference");
     $request->print("Browsing or <a href=\"/adm/ambiguous\">ambiguous</a> reference, submissions ignored $help<br />");
    }
         }
         #if ($Apache::lonhomework::viewgrades eq 'F') {&createmenu('grade',$request); }
       }
       if ($target eq 'answer') { &showhash(%Apache::lonhomework::history); }
       if ($target eq 'web') {&Apache::lonhomework::showhashsubset(\%ENV,'^form');}
   
       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='';
       }
       &Apache::lonxml::debug("Should be parsing now");
       $result = &Apache::lonxml::xmlparse($request, $target, $problem,
    $default.&setup_vars($target),%mystyle);
   
       #$request->print("Result follows:");
       if ($target eq 'modified') {
         &handle_save_or_undo($request,\$problem,\$result);
     } else {      } else {
       return 'edit';        if ($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);
     }      }
       #$request->print(":Result ends");
       #my $td=&tv_interval($t0);
   }    }
 }  }
   
 sub setup_vars {  # with no arg it returns a HTML <option> list of the template titles
   my ($target) = @_;  # with one arg it returns the filename associated with the arg passed
   return ';'  sub get_template_list {
 #  return ';$external::target='.$target.';';    my ($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 {
         push (@allnames, $name);
       }
     }
     if (@allnames && !$result) {
       $result="<option>Select a $extension type</option>\n<option>".
         join('</option><option>',sort(@allnames)).'</option>';
     }
     return $result;
 }  }
   
 sub send_header {  sub newproblem {
   my ($request)= @_;      my ($request) = @_;
   $request->print(&Apache::lontexconvert::header());      my $extension=$request->uri;
   $request->print('<form name='.$ENV{'form.request.prefix'}.'lonhomework method="POST" action="'.$request->uri.'">');      $extension=~s:^.*\.([\w]+)$:$1:;
       &Apache::lonxml::debug("Looking for :$extension:");
       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);
    copy($file,$dest);
    &renderpage($request,$dest);
       } elsif($ENV{'form.newfile'}) {
    # 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 $templatelist=&get_template_list('',$extension);
    my $url=$request->uri;
    my $dest = &Apache::lonnet::filelocation("",$request->uri);
    my $instructions;
    if ($templatelist) { $instructions=", select a template from the pull-down menu below. Then";}
    $request->print(<<ENDNEWPROBLEM);
   <body bgcolor="#FFFFFF">
   The requested file $url doesn\'t exist. <br />
   To create a new $extension$instructions click on the Create $extension button.
   <form action="$url" method="POST">
   ENDNEWPROBLEM
    if (defined($templatelist)) {
       $request->print("<select name=\"template\">$templatelist</select>");
    }
    $request->print("<br /><input type=\"submit\" name=\"newfile\" value=\"Create $extension\" />");
    $request->print("</form></body>");
       }
       return '';
 }  }
   
 sub send_footer {  sub view_or_edit_menu {
   my ($request)= @_;    my ($request) = @_;
   $request->print('</form>');    my $url=$request->uri;
   $request->print(&Apache::lontexconvert::footer());    $request->print(<<EDITMENU);
   <body bgcolor="#FFFFFF">
   <form action="$url" method="POST">
   Would you like to <input type="submit" name="problemmode" value="View"> or
   <input type="submit" name="problemmode" value="Edit"> the problem.
   </form>
   </body>
   EDITMENU
 }  }
   
 sub getfilenothere {  sub handler {
   my ($filename) = @_;    #my $t0 = [&gettimeofday()];
   my $a="";    my $request=$_[0];
   if (! -e $filename ) {  
     &Apache::lonnet::subscribe($filename);  #  if ( $ENV{'user.name'} eq 'albertel' ) {$Apache::lonxml::debug=1;}
     &Apache::lonnet::repcopy($filename);    $Apache::lonxml::debug=$ENV{'user.debug'};
   
     if (&setupheader($request)) { return OK; }
     $ENV{'request.uri'}=$request->uri;
   
     #setup permissions
     $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
     $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
     &Apache::lonxml::debug("Permissions:$Apache::lonhomework::browse:$Apache::lonhomework::viewgrades:");
     # some times multiple problemmodes are submitted, need to select
     # the last one
     &Apache::lonxml::debug("Problem Mode ".$ENV{'form.problemmode'});
     if ( defined($ENV{'form.problemmode'}) &&
          ref($ENV{'form.problemmode'}) ) {
       &Apache::lonxml::debug("Problem Mode ".join(",",@$ENV{'form.problemmode'}));
       my $mode=$ENV{'form.problemmode'}->[-1];
       undef $ENV{'form.problemmode'};
       $ENV{'form.problemmode'}=$mode;
   }    }
   {    &Apache::lonxml::debug("Problem Mode ".$ENV{'form.problemmode'});
     my $fh=Apache::File->new($filename);    my $file=&Apache::lonnet::filelocation("",$request->uri);
   
     while (<$fh>) {    #check if we know where we are
       $a .=$_;    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') {
         #should know where we are, so ask
         $request->internal_redirect('/adm/ambiguous'); return;
     }      }
   }    }
   return $a  
     if ($ENV{'request.state'} eq "construct") {
       if ($ENV{'form.resetdata'} eq 'Reset Submissions') {
         my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
         &Apache::lonnet::tmpreset($symb,'',$domain,$name);
       }
       if ( -e $file ) {
         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 'EditXML') {
    &editxmlmode($request,$file);
         } elsif ($ENV{'form.problemmode'} eq 'Answer Distribution') {
    &analyze($request,$file);
         } else {
    &renderpage($request,$file);
         }
       } else {
         # requested file doesn't exist in contruction space
         &newproblem($request);
       }
     } else {
       # just render the page normally outside of construction space
       &Apache::lonxml::debug("not construct");
       &renderpage($request,$file);
     }
     #my $td=&tv_interval($t0);
     #&Apache::lonxml::debug("Spent $td seconds processing");
     # &Apache::lonhomework::send_footer($request);
     # always turn off debug messages
     $Apache::lonxml::debug=0;
     return OK;
   
 }  }
   
 1;  1;
Removed from v.1.15  
changed lines
  Added in v.1.96

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.