# The LearningOnline Network with CAPA
# Publication Handler
# 
# (TeX Content Handler
#
# 05/29/00,05/30,10/11 Gerd Kortemeyer)
#
# 11/28,11/29,11/30 Gerd Kortemeyer

package Apache::lonpublisher;

use strict;
use Apache::File;
use Apache::Constants qw(:common :http :methods);
use HTML::TokeParser;
use Apache::lonxml;
use Apache::lonhomework;

my %addid;
my %nokey;

my %metadatafields;
my %metadatakeys;

sub metaeval {
    my $metastring=shift;
   
        my $parser=HTML::TokeParser->new(\$metastring);
        my $token;
        while ($token=$parser->get_token) {
           if ($token->[0] eq 'S') {
	      my $entry=$token->[1];
              my $unikey=$entry;
              if (defined($token->[2]->{'part'})) { 
                 $unikey.='_'.$token->[2]->{'part'}; 
	      }
              if (defined($token->[2]->{'name'})) { 
                 $unikey.='_'.$token->[2]->{'name'}; 
	      }
               map {
		  $metadatafields{$unikey.'.'.$_}=$token->[2]->{$_};
                  if ($metadatakeys{$unikey}) {
		      $metadatakeys{$unikey}.=','.$_;
                  } else {
                      $metadatakeys{$unikey}=$_;
                  }
              } @{$token->[3]};
              if ($metadatafields{$unikey}) {
                 $metadatafields{$unikey}.=','.$parser->get_text('/'.$entry);
	      } else {
                 $metadatafields{$unikey}=$parser->get_text('/'.$entry);
              }
          }
       }
}

sub metaread {
    my ($logfile,$fn)=@_;
    unless (-e $fn) {
	print $logfile 'No file '.$fn."\n";
        return '<br><b>No file:</b> <tt>'.$fn.'</tt>';
    }
    print $logfile 'Processing '.$fn."\n";
    my $metastring;
    {
     my $metafh=Apache::File->new($fn);
     $metastring=join('',<$metafh>);
    }
    &metaeval($metastring);
    return '<br><b>Processed file:</b> <tt>'.$fn.'</tt>';
}

sub publish {

    my ($source,$target,$style)=@_;
    my $logfile;
    my $scrout='';

    unless ($logfile=Apache::File->new('>>'.$source.'.log')) {
	return 
         '<font color=red>No write permission to user directory, FAIL</font>';
    }
    print $logfile 
"\n\n================== Publish ".localtime()." =================\n";

    if (($style eq 'ssi') || ($style eq 'rat')) {
# ------------------------------------------------------- This needs processing

# ----------------------------------------------------------------- Backup Copy
	my $copyfile=$source.'.save';
        {
	    my $org=Apache::File->new($source);
            my $cop=Apache::File->new('>'.$copyfile);
            while (my $line=<$org>) { print $cop $line; }
        }
        if (-e $copyfile) {
	    print $logfile "Copied original file to ".$copyfile."\n";
        } else {
	    print $logfile "Unable to write backup ".$copyfile."\n";
            return "<font color=red>Failed to write backup copy, FAIL</font>";
        }
# ------------------------------------------------------------- IDs and indices

        my $maxindex=10;
        my $maxid=10;
        my $content='';
        my $needsfixup=0;

        {
          my $org=Apache::File->new($source);
          $content=join('',<$org>);
        }
        {
          my $parser=HTML::TokeParser->new(\$content);
          my $token;
          while ($token=$parser->get_token) {
              if ($token->[0] eq 'S') {
                  my $counter;
		  if ($counter=$addid{$token->[1]}) {
		      if ($counter eq 'id') {
			  if (defined($token->[2]->{'id'})) {
                             $maxid=
		       ($token->[2]->{'id'}>$maxid)?$token->[2]->{'id'}:$maxid;
			 } else {
                             $needsfixup=1;
                         }
                      } else {
 			  if (defined($token->[2]->{'index'})) {
                             $maxindex=
	   ($token->[2]->{'index'}>$maxindex)?$token->[2]->{'index'}:$maxindex;
			  } else {
                             $needsfixup=1;
			  }
		      }
		  }
              }
          }
      }
      if ($needsfixup) {
          print $logfile "Needs ID and/or index fixup\n".
	        "Max ID   : $maxid (min 10)\n".
                "Max Index: $maxindex (min 10)\n";

          my $outstring='';
          my $parser=HTML::TokeParser->new(\$content);
          my $token;
          while ($token=$parser->get_token) {
              if ($token->[0] eq 'S') {
                  my $counter;
		  if ($counter=$addid{$token->[1]}) {
		      if ($counter eq 'id') {
			  if (defined($token->[2]->{'id'})) {
			      $outstring.=$token->[4];
			  } else {
                              $maxid++;
                              my $thisid=' id="'.$maxid.'"';
			      my $fixup=$token->[4];
                              $fixup=~s/(\<\w+)/$1$thisid/;
                              $outstring.=$fixup;
                              print $logfile 'ID: '.$fixup."\n";
                          }
                      } else {
 			  if (defined($token->[2]->{'index'})) {
			      $outstring.=$token->[4];
			  } else {
                              $maxindex++;
                              my $thisindex=' index="'.$maxindex.'"';
			      my $fixup=$token->[4];
                              $fixup=~s/(\<\w+)/$1$thisindex/;
                              $outstring.=$fixup;
                              print $logfile 'Index: '.$fixup."\n";
			  }
		      }
		  } else {
                      $outstring.=$token->[4];
                  }
              } elsif ($token->[0] eq 'E') {
                  $outstring.=$token->[2];
              } else {
                  $outstring.=$token->[1];
              }
          }
        {
          my $org;
          unless ($org=Apache::File->new('>'.$source)) {
             print $logfile "No write permit to $source\n";
             return 
              "<font color=red>No write permission to $source, FAIL</font>";
	  }
          print $org $outstring;
        }
	  $content=$outstring;
          print $logfile "End of ID and/or index fixup\n".
	        "Max ID   : $maxid (min 10)\n".
                "Max Index: $maxindex (min 10)\n";
      } else {
	  print $logfile "Does not need ID and/or index fixup\n";
      }

# --------------------------------------------- Initial step done, now metadata

# ---------------------------------------- Storage for metadata keys and fields

        %metadatafields=();
        %metadatakeys=();

# ------------------------------------------------ First, check out environment

        $metadatafields{'author'}=$ENV{'environment.firstname'}.' '.
	                          $ENV{'environment.middlename'}.' '.
		                  $ENV{'environment.lastname'}.' '.
		                  $ENV{'environment.generation'};

# ------------------------------------------------ Check out directory hierachy

        my $thisdisfn=$source;
        $thisdisfn=~s/^\/home\/$ENV{'user.name'}\///;

        my @urlparts=split(/\//,$thisdisfn);
        $#urlparts--;

        my $currentpath='/home/'.$ENV{'user.name'}.'/';

        map {
	    $currentpath.=$_.'/';
            $scrout.=&metaread($logfile,$currentpath.'default.meta');
        } @urlparts;

# ------------------- Clear out parameters and stores (there should not be any)

        map {
	    if (($_=~/^parameter/) || ($_=~/^stores/)) {
		delete $metadatafields{$_};
            }
        } keys %metadatafields;

# ---------------------- Read previous metafile, remember parameters and stores

        $scrout.=&metaread($logfile,$source.'.meta');
        my %oldparmstores=();

        map {
	    if (($_=~/^parameter/) || ($_=~/^stores/)) {
                $oldparmstores{$_}=1;
		delete $metadatafields{$_};
            }
        } keys %metadatafields;
        


# -------------------------------------------------- Parse content for metadata

	my $allmeta='';
        if ($source=~/\.problem$/) {
	    $allmeta=Apache::lonhomework::subhandler('meta',$content);
        } else {
            $allmeta=Apache::lonxml::xmlparse('meta',$content);
	}
        &metaeval($allmeta);

# ---------------- Find and document discrepancies in the parameters and stores

        my $chparms='';
        map {
	    if (($_=~/^parameter/) || ($_=~/^stores/)) {
                unless ($_=~/\.\w+$/) { 
                   unless ($oldparmstores{$_}) {
		      print $logfile 'New: '.$_."\n";
                      $chparms.=$_.' ';
                   }
	        }
            }
        } sort keys %metadatafields;
        if ($chparms) {
	    $scrout.='<p><b>New parameters or stored values:</b> '.
                     $chparms;
        }

        my $chparms='';
        map {
	    if (($_=~/^parameter/) || ($_=~/^stores/)) {
                unless (($metadatafields{$_}) || ($_=~/\.\w+$/)) {
		    print $logfile 'Obsolete: '.$_."\n";
                    $chparms.=$_.' ';
                }
            }
        } sort keys %oldparmstores;
        if ($chparms) {
	    $scrout.='<p><b>Obsolete parameters or stored values:</b> '.
                     $chparms;
        }

# DEBUG:

        $scrout.=$allmeta;

# --------------------------------------------------- Scan content for keywords

	my $keywordout='<table border=2><tr>';
        my $colcount=0;
        
	{
	    my $textonly=$content;
            $textonly=~s/\<script[^\<]+\<\/script\>//g;
            $textonly=~s/\<m\>[^\<]+\<\/m\>//g;
            $textonly=~s/\<[^\>]*\>//g;
            $textonly=~tr/A-Z/a-z/;
            $textonly=~s/[\$\&][a-z]\w*//g;
            $textonly=~s/[^a-z\s]//g;

            my %keywords=();
            map {
		unless ($nokey{$_}) {
                   $keywords{$_}=1;
                } 
            } ($textonly=~m/(\w+)/g);


            map {
                $keywordout.='<td><input type=checkbox name="'.$_.'">'.$_.
                             '</td>';
                if ($colcount>10) {
		    $keywordout.="</tr><tr>\n";
                    $colcount=0;
                }
                $colcount++;
            } sort keys %keywords;
            $keywordout.='</tr></table>';

        }         
        
# DEGUG
 
	$scrout.=$keywordout;
    }
    return $scrout;
}

# ================================================================ Main Handler

sub handler {
  my $r=shift;

  if ($r->header_only) {
     $r->content_type('text/html');
     $r->send_http_header;
     return OK;
  }

# -------------------------------------------------------------- Check filename

  my $fn=$ENV{'form.filename'};

  unless ($fn) { 
     $r->log_reason($ENV{'user.name'}.' at '.$ENV{'user.domain'}.
         ' trying to publish empty filename', $r->filename); 
     return HTTP_NOT_FOUND;
  } 

  unless ($ENV{'user.home'} eq $r->dir_config('lonHostID')) {
     $r->log_reason($ENV{'user.name'}.' at '.$ENV{'user.domain'}.
         ' trying to publish file '.$ENV{'form.filename'}.
         ' ('.$fn.') - not homeserver ('.$ENV{'user.home'}.')', 
         $r->filename); 
     return HTTP_NOT_ACCEPTABLE;
  }

  $fn=~s/^http\:\/\/[^\/]+\/\~(\w+)/\/home\/$1\/public_html/;

  my $targetdir='';
  my $docroot=$r->dir_config('lonDocRoot'); 
  if ($1 ne $ENV{'user.name'}) {
     $r->log_reason($ENV{'user.name'}.' at '.$ENV{'user.domain'}.
         ' trying to publish unowned file '.$ENV{'form.filename'}.
         ' ('.$fn.')', 
         $r->filename); 
     return HTTP_NOT_ACCEPTABLE;
  } else {
      $targetdir=$docroot.'/res/'.$ENV{'user.domain'};
  }
                                 
  
  unless (-e $fn) { 
     $r->log_reason($ENV{'user.name'}.' at '.$ENV{'user.domain'}.
         ' trying to publish non-existing file '.$ENV{'form.filename'}.
         ' ('.$fn.')', 
         $r->filename); 
     return HTTP_NOT_FOUND;
  } 

# --------------------------------- File is there and owned, init lookup tables

  %addid=();

  {
      my $fh=Apache::File->new($r->dir_config('lonTabDir').'/addid.tab');
      while (<$fh>=~/(\w+)\s+(\w+)/) {
          $addid{$1}=$2;
      }
  }

  %nokey=();

  {
     my $fh=Apache::File->new($r->dir_config('lonIncludes').'/un_keyword.tab');
      map {
          my $word=$_;
          chomp($word);
          $nokey{$word}=1;
      } <$fh>;
  }
# ----------------------------------------------------------- Start page output

  $r->content_type('text/html');
  $r->send_http_header;

  $r->print('<html><head><title>LON-CAPA Publishing</title></head>');
  $r->print('<body bgcolor="#FFFFFF">');
  my $thisfn=$fn;
   
# ------------------------------------------------------------- Individual file
  {
      $thisfn=~/\.(\w+)$/;
      my $thistype=$1;
      my $thisembstyle=&Apache::lonnet::fileembstyle($thistype);

      my $thistarget=$thisfn;
      
      $thistarget=~s/^\/home/$targetdir/;
      $thistarget=~s/\/public\_html//;

      my $thisdistarget=$thistarget;
      $thisdistarget=~s/^$docroot//;

      my $thisdisfn=$thisfn;
      $thisdisfn=~s/^\/home\/$ENV{'user.name'}\/public_html\///;

      $r->print('<h2>Publishing '.
        &Apache::lonnet::filedescription($thistype).' <tt>'.
        $thisdisfn.'</tt></h2><b>Target:</b> <tt>'.$thisdistarget.'</tt><p>');

# ------------ We are publishing from $thisfn to $thistarget with $thisembstyle

      $r->print('<hr>'.&publish($thisfn,$thistarget,$thisembstyle));
      
  }  

  $r->print('</body></html>');

  return OK;
}

1;
__END__