# The LearningOnline Network with CAPA
# Publication Handler
#
# $Id: lonpublisher.pm,v 1.58 2001/12/05 20:37:06 www Exp $
#
# 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/
#
# 
# (TeX Content Handler
#
# 05/29/00,05/30,10/11 Gerd Kortemeyer)
#
# 11/28,11/29,11/30,12/01,12/02,12/04,12/23 Gerd Kortemeyer
# 03/23 Guy Albertelli
# 03/24,03/29,04/03 Gerd Kortemeyer
# 04/16/2001 Scott Harrison
# 05/03,05/05,05/07 Gerd Kortemeyer
# 05/28/2001 Scott Harrison
# 06/23,08/07,08/11,8/13,8/17,8/18,8/24,9/26,10/16 Gerd Kortemeyer
# 12/04,12/05 Guy Albertelli
# 12/05 Gerd Kortemeyer

package Apache::lonpublisher;

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

my %addid;
my %nokey;
my %language;
my %cprtag;

my %metadatafields;
my %metadatakeys;

my $docroot;

my $cuname;
my $cudom;

# ----------------------------------------------- Evaluate string with metadata

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]->{'package'})) { 
                  $unikey.='_package_'.$token->[2]->{'package'};
              } 
              if (defined($token->[2]->{'part'})) { 
                 $unikey.='_'.$token->[2]->{'part'}; 
	      }
              if (defined($token->[2]->{'id'})) { 
                  $unikey.='_'.$token->[2]->{'id'};
              } 
              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}) {
		  my $newentry=$parser->get_text('/'.$entry);
                  unless (($metadatafields{$unikey}=~/$newentry/) ||
                          ($newentry eq '')) {
                     $metadatafields{$unikey}.=', '.$newentry;
		  }
	      } else {
                 $metadatafields{$unikey}=$parser->get_text('/'.$entry);
              }
          }
       }
}

# -------------------------------------------------------- Read a metadata file

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>';
}

# ---------------------------- convert 'time' format into a datetime sql format
sub sqltime {
    my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) =
	localtime(@_[0]);
    $mon++; $year+=1900;
    return "$year-$mon-$mday $hour:$min:$sec";
}

# --------------------------------------------------------- Various form fields

sub textfield {
    my ($title,$name,$value)=@_;
    return "\n<p><b>$title:</b><br>".
           '<input type=text name="'.$name.'" size=80 value="'.$value.'">';
}

sub hiddenfield {
    my ($name,$value)=@_;
    return "\n".'<input type=hidden name="'.$name.'" value="'.$value.'">';
}

sub selectbox {
    my ($title,$name,$value,%options)=@_;
    my $selout="\n<p><b>$title:</b><br>".'<select name="'.$name.'">';
    map {
        $selout.='<option value="'.$_.'"';
        if ($_ eq $value) { $selout.=' selected'; }
        $selout.='>'.$options{$_}.'</option>';
    } sort keys %options;
    return $selout.'</select>';
}

# -------------------------------------------------------- Publication Step One

sub urlfixup {
    my ($url,$target)=@_;
    unless ($url) { return ''; }
    my ($host)=($url=~/(?:http\:\/\/)*([^\/]+)/);
    map {
	if ($_ eq $host) {
	    $url=~s/^http\:\/\///;
            $url=~s/^$host//;
        }
    } values %Apache::lonnet::hostname;
    if ($url=~/^http\:\/\//) { return $url; }
    $url=~s/\~$cuname/res\/$cudom\/$cuname/;
    if ($target) {
	$target=~s/\/[^\/]+$//;
       $url=&Apache::lonnet::hreflocation($target,$url);
    }
    return $url;
}

sub publish {

    my ($source,$target,$style)=@_;
    my $logfile;
    my $scrout='';
    my $allmeta='';
    my $content='';
    my %allow=();
    undef %allow;

    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()." Phase One  ================\n";

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

# ----------------------------------------------------------------- Backup Copy
	my $copyfile=$source.'.save';
        if (copy($source,$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 $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);
          $parser->xml_mode(1);
          my $token;
          while ($token=$parser->get_token) {
              if ($token->[0] eq 'S') {
                my $counter;
                my $tag=$token->[1];
                my $lctag=lc($tag);
                unless ($lctag eq 'allow') {  
                  my %parms=%{$token->[2]};
                  $counter=$addid{$tag};
                  if (!$counter) { $counter=$addid{$lctag}; }
                  if ($counter) {
		      if ($counter eq 'id') {
			  unless (defined($parms{'id'})) {
                              $maxid++;
                              $parms{'id'}=$maxid;
                              print $logfile 'ID: '.$tag.':'.$maxid."\n";
                          }
                      } elsif ($counter eq 'index') {
 			  unless (defined($parms{'index'})) {
                              $maxindex++;
                              $parms{'index'}=$maxindex;
                              print $logfile 'Index: '.$tag.':'.$maxindex."\n";
			  }
		      }
		  } 
                  
                  map {
                      if (defined($parms{$_})) {
			  my $oldurl=$parms{$_};
                          my $newurl=&urlfixup($oldurl,$target);
                          if ($newurl ne $oldurl) {
			      $parms{$_}=$newurl;
                              print $logfile 'URL: '.$tag.':'.$oldurl.' - '.
				  $newurl."\n";
			  }
                          $allow{$newurl}=1;
                      }
                  } ('src','href','background');

                  if ($lctag eq 'applet') {
		      my $codebase='';
                      if (defined($parms{'codebase'})) {
		         my $oldcodebase=$parms{'codebase'};
                         unless ($oldcodebase=~/\/$/) {
                            $oldcodebase.='/';
                         }
                         $codebase=&urlfixup($oldcodebase,$target);
                         $codebase=~s/\/$//;    
                         if ($codebase ne $oldcodebase) {
			     $parms{'codebase'}=$codebase;
                             print $logfile 'URL codebase: '.$tag.':'.
                                  $oldcodebase.' - '.
				  $codebase."\n";
			 }
                         $allow{$codebase.'/*'}=1;
		      } else {
                        map {
                          if (defined($parms{$_})) {
			      my $oldurl=$parms{$_};
                              my $newurl=&urlfixup($oldurl,$target);
			      $newurl=~s/\/[^\/]+$/\/\*/;
                                  print $logfile 'Allow: applet '.$_.':'.
                                  $oldurl.' allows '.
				  $newurl."\n";
                              $allow{$newurl}=1;
                          }
                        } ('archive','code','object');
                      }
                  }

                  my $newparmstring='';
                  my $endtag='';
                  map {
                    if ($_ eq '/') {
                      $endtag=' /';
                    } else { 
                      my $quote=($parms{$_}=~/\"/?"'":'"');
                      $newparmstring.=' '.$_.'='.$quote.$parms{$_}.$quote;
		    }
                  } keys %parms;
		  if (!$endtag) { if ($token->[4]=~m:/>$:) { $endtag=' /'; }; }
		  $outstring.='<'.$tag.$newparmstring.$endtag.'>';
	         } else {
		   $allow{$token->[2]->{'src'}}=1;
		 }
              } elsif ($token->[0] eq 'E') {
		if ($token->[2]) {
                  unless ($token->[1] eq 'allow') {
                     $outstring.='</'.$token->[1].'>';
		  }
		}
              } else {
                  $outstring.=$token->[1];
              }
          }
# ------------------------------------------------------------ Construct Allows
     unless ($style eq 'rat') {
	$scrout.='<h3>Dependencies</h3>';
	my $allowstr="\n";
        map {
           $allowstr.='<allow src="'.$_.'" />'."\n";
           $scrout.='<br>';
           unless ($_=~/\*/) {
	       $scrout.='<a href="'.$_.'">';
           }
           $scrout.='<tt>'.$_.'</tt>';
           unless ($_=~/\*/) {
	       $scrout.='</a>';
               if (&Apache::lonnet::getfile(
                   $Apache::lonnet::perlvar{'lonDocRoot'}.'/'.
                                            $_.'.meta') eq '-1') {
		   $scrout.=
                           ' - <font color=red>Currently not available</font>';
               }
           }
        } keys %allow;
        $outstring=~s/(\<\/[^\>]+\>\s*)$/$allowstr$1/s;
    }
# ------------------------------------------------------------- Write modified

        {
          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;

      if ($needsfixup) {
          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=();
     
     my %oldparmstores=();
     
     $scrout.='<h3>Metadata Information</h3>';

# ------------------------------------------------ First, check out environment
     unless (-e $source.'.meta') {
        $metadatafields{'author'}=$ENV{'environment.firstname'}.' '.
	                          $ENV{'environment.middlename'}.' '.
		                  $ENV{'environment.lastname'}.' '.
		                  $ENV{'environment.generation'};
        $metadatafields{'author'}=~s/\s+/ /g;
        $metadatafields{'author'}=~s/\s+$//;
        $metadatafields{'owner'}=$cuname.'@'.$cudom;

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

        my $thisdisfn=$source;
        $thisdisfn=~s/^\/home\/$cuname\///;

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

        my $currentpath='/home/'.$cuname.'/';

        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;

    } else {
# ---------------------- Read previous metafile, remember parameters and stores

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

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

# -------------------------------------------------- Parse content for metadata
    if ($style eq 'ssi') {
        my $oldenv=$ENV{'request.uri'};

        $ENV{'request.uri'}=$target;
        $allmeta=Apache::lonxml::xmlparse('meta',$content);
        $ENV{'request.uri'}=$oldenv;

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

# ------------------------------------------------------- Now have all metadata

        $scrout.=
     '<form action="/adm/publish" method="post">'.
          &hiddenfield('phase','two').
          &hiddenfield('filename',$ENV{'form.filename'}).
	  &hiddenfield('allmeta',&Apache::lonnet::escape($allmeta)).
          &hiddenfield('dependencies',join(',',keys %allow)).
          &textfield('Title','title',$metadatafields{'title'}).
          &textfield('Author(s)','author',$metadatafields{'author'}).
	  &textfield('Subject','subject',$metadatafields{'subject'});

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

	my $keywordout='<p><b>Keywords:</b><br><table border=2><tr>';
        my $colcount=0;
        
	if (length($content)<500000) {
	    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 {
		$keywords{$_}=1;
            } split(/\W+/,$metadatafields{'keywords'});

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

        } else {
	    $keywordout.='<td>File too long for keyword analysis</td>';
        }         
        
	$keywordout.='</tr></table>';

        $scrout.=$keywordout;

        $scrout.=&textfield('Additional Keywords','addkey','');

        $scrout.=&textfield('Notes','notes',$metadatafields{'notes'});

        $scrout.=
             '<p><b>Abstract:</b><br><textarea cols=80 rows=5 name=abstract>'.
              $metadatafields{'abstract'}.'</textarea>';

	$source=~/\.(\w+)$/;

	$scrout.=&hiddenfield('mime',$1);

        $scrout.=&selectbox('Language','language',
                            $metadatafields{'language'},%language);

        unless ($metadatafields{'creationdate'}) {
	    $metadatafields{'creationdate'}=time;
        }
        $scrout.=&hiddenfield('creationdate',$metadatafields{'creationdate'});

        $scrout.=&hiddenfield('lastrevisiondate',time);

			   
	$scrout.=&textfield('Publisher/Owner','owner',
                            $metadatafields{'owner'});
# --------------------------------------------------- Correct copyright for rat        
    if ($style eq 'rat') {
       if ($metadatafields{'copyright'} eq 'public') { 
          delete $metadatafields{'copyright'};
       }
       delete $cprtag{'public'};
   }

        $scrout.=&selectbox('Copyright/Distribution','copyright',
                            $metadatafields{'copyright'},%cprtag);

    return $scrout.
      '<p><input type="submit" value="Finalize Publication"></form>';
}

# -------------------------------------------------------- Publication Step Two

sub phasetwo {

    my ($source,$target,$style,$distarget)=@_;
    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================= Publish ".localtime()." Phase Two  ================\n";

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

     &metaeval(&Apache::lonnet::unescape($ENV{'form.allmeta'}));

     $metadatafields{'title'}=$ENV{'form.title'};
     $metadatafields{'author'}=$ENV{'form.author'};
     $metadatafields{'subject'}=$ENV{'form.subject'};
     $metadatafields{'notes'}=$ENV{'form.notes'};
     $metadatafields{'abstract'}=$ENV{'form.abstract'};
     $metadatafields{'mime'}=$ENV{'form.mime'};
     $metadatafields{'language'}=$ENV{'form.language'};
     $metadatafields{'creationdate'}=$ENV{'form.creationdate'};
     $metadatafields{'lastrevisiondate'}=$ENV{'form.lastrevisiondate'};
     $metadatafields{'owner'}=$ENV{'form.owner'};
     $metadatafields{'copyright'}=$ENV{'form.copyright'};

     my $allkeywords=$ENV{'form.addkey'};
     map {
         if ($_=~/^form\.key\.(\w+)/) {
	     $allkeywords.=','.$1;
         }
     } keys %ENV;
     $allkeywords=~s/\W+/\,/;
     $allkeywords=~s/^\,//;
     $metadatafields{'keywords'}=$allkeywords;
 
     {
       print $logfile "\nWrite metadata file for ".$source;
       my $mfh;
       unless ($mfh=Apache::File->new('>'.$source.'.meta')) {
	return 
         '<font color=red>Could not write metadata, FAIL</font>';
       }    
       map {
	 unless ($_=~/\./) {
           my $unikey=$_;
           $unikey=~/^([A-Za-z]+)/;
           my $tag=$1;
           $tag=~tr/A-Z/a-z/;
           print $mfh "\n\<$tag";
           map {
               my $value=$metadatafields{$unikey.'.'.$_};
               $value=~s/\"/\'\'/g;
               print $mfh ' '.$_.'="'.$value.'"';
           } split(/\,/,$metadatakeys{$unikey});
	   print $mfh '>'.$metadatafields{$unikey}.'</'.$tag.'>';
         }
       } sort keys %metadatafields;
       $scrout.='<p>Wrote Metadata';
       print $logfile "\nWrote metadata";
     }

# -------------------------------- Synchronize entry with SQL metadata database
    my %perlvar;
    open (CONFIG,"/etc/httpd/conf/access.conf") || die "Can't read access.conf";
    my $configline;
    while ($configline=<CONFIG>) {
	if ($configline =~ /PerlSetVar/) {
	    my ($dummy,$varname,$varvalue)=split(/\s+/,$configline);
	    chomp($varvalue);
	    $perlvar{$varname}=$varvalue;
	}
    }
    close(CONFIG);

    my $warning;
    my $dbh;
    {
	unless (
		$dbh = DBI->connect("DBI:mysql:loncapa","www",$perlvar{'lonSqlAccess'},{ RaiseError =>0,PrintError=>0})
		) { 
	    $warning='<font color=red>WARNING: Cannot connect to '.
		'database!</font>';
	}
	else {
	    my %sqldatafields;
	    $sqldatafields{'url'}=$distarget;
	    my $sth=$dbh->prepare(
				  'delete from metadata where url like binary'.
				  '"'.$sqldatafields{'url'}.'"');
	    $sth->execute();
	    map {my $field=$metadatafields{$_}; $field=~s/\"/\'\'/g; 
		 $sqldatafields{$_}=$field;}
	    ('title','author','subject','keywords','notes','abstract',
	     'mime','language','creationdate','lastrevisiondate','owner',
	     'copyright');
	    
	    $sth=$dbh->prepare('insert into metadata values ('.
			       '"'.delete($sqldatafields{'title'}).'"'.','.
			       '"'.delete($sqldatafields{'author'}).'"'.','.
			       '"'.delete($sqldatafields{'subject'}).'"'.','.
			       '"'.delete($sqldatafields{'url'}).'"'.','.
			       '"'.delete($sqldatafields{'keywords'}).'"'.','.
			       '"'.'current'.'"'.','.
			       '"'.delete($sqldatafields{'notes'}).'"'.','.
			       '"'.delete($sqldatafields{'abstract'}).'"'.','.
			       '"'.delete($sqldatafields{'mime'}).'"'.','.
			       '"'.delete($sqldatafields{'language'}).'"'.','.
			       '"'.
			       sqltime(delete($sqldatafields{'creationdate'}))
			       .'"'.','.
			       '"'.
			       sqltime(delete(
			       $sqldatafields{'lastrevisiondate'})).'"'.','.
			       '"'.delete($sqldatafields{'owner'}).'"'.','.
			       '"'.delete(
			       $sqldatafields{'copyright'}).'"'.')');
	    $sth->execute();
	    $dbh->disconnect;
	    $scrout.='<p>Synchronized SQL metadata database';
	    print $logfile "\nSynchronized SQL metadata database";
	}
    }


# ----------------------------------------------------------- Copy old versions
   
if (-e $target) {
    my $filename;
    my $maxversion=0;
    $target=~/(.*)\/([^\/]+)\.(\w+)$/;
    my $srcf=$2;
    my $srct=$3;
    my $srcd=$1;
    unless ($srcd=~/^\/home\/httpd\/html\/res/) {
	print $logfile "\nPANIC: Target dir is ".$srcd;
        return "<font color=red>Invalid target directory, FAIL</font>";
    }
    opendir(DIR,$srcd);
    while ($filename=readdir(DIR)) {
       if ($filename=~/$srcf\.(\d+)\.$srct$/) {
	   $maxversion=($1>$maxversion)?$1:$maxversion;
       }
    }
    closedir(DIR);
    $maxversion++;
    $scrout.='<p>Creating old version '.$maxversion;
    print $logfile "\nCreating old version ".$maxversion;

    my $copyfile=$srcd.'/'.$srcf.'.'.$maxversion.'.'.$srct;

        if (copy($target,$copyfile)) {
	    print $logfile "Copied old target to ".$copyfile."\n";
            $scrout.='<p>Copied old target file';
        } else {
	    print $logfile "Unable to write ".$copyfile.':'.$!."\n";
           return "<font color=red>Failed to copy old target, $!, FAIL</font>";
        }

# --------------------------------------------------------------- Copy Metadata

	$copyfile=$copyfile.'.meta';

        if (copy($target.'.meta',$copyfile)) {
	    print $logfile "Copied old target metadata to ".$copyfile."\n";
            $scrout.='<p>Copied old metadata';
        } else {
	    print $logfile "Unable to write metadata ".$copyfile.':'.$!."\n";
            if (-e $target.'.meta') {
               return 
       "<font color=red>Failed to write old metadata copy, $!, FAIL</font>";
	    }
        }


} else {
    $scrout.='<p>Initial version';
    print $logfile "\nInitial version";
}

# ---------------------------------------------------------------- Write Source
	my $copyfile=$target;

           my @parts=split(/\//,$copyfile);
           my $path="/$parts[1]/$parts[2]/$parts[3]/$parts[4]";

           my $count;
           for ($count=5;$count<$#parts;$count++) {
               $path.="/$parts[$count]";
               if ((-e $path)!=1) {
                   print $logfile "\nCreating directory ".$path;
                   $scrout.='<p>Created directory '.$parts[$count];
		   mkdir($path,0777);
               }
           }

        if (copy($source,$copyfile)) {
	    print $logfile "Copied original source to ".$copyfile."\n";
            $scrout.='<p>Copied source file';
        } else {
	    print $logfile "Unable to write ".$copyfile.':'.$!."\n";
            return "<font color=red>Failed to copy source, $!, FAIL</font>";
        }

# --------------------------------------------------------------- Copy Metadata

        $copyfile=$copyfile.'.meta';

        if (copy($source.'.meta',$copyfile)) {
	    print $logfile "Copied original metadata to ".$copyfile."\n";
            $scrout.='<p>Copied metadata';
        } else {
	    print $logfile "Unable to write metadata ".$copyfile.':'.$!."\n";
            return 
          "<font color=red>Failed to write metadata copy, $!, FAIL</font>";
        }

# --------------------------------------------------- Send update notifications

{

    my $filename;
 
    $target=~/(.*)\/([^\/]+)$/;
    my $srcf=$2;
    opendir(DIR,$1);
    while ($filename=readdir(DIR)) {
       if ($filename=~/$srcf\.(\w+)$/) {
	   my $subhost=$1;
           if ($subhost ne 'meta') {
	       $scrout.='<p>Notifying host '.$subhost.':';
               print $logfile "\nNotifying host '.$subhost.':'";
               my $reply=&Apache::lonnet::critical('update:'.$target,$subhost);
               $scrout.=$reply;
               print $logfile $reply;              
           }
       }
    }
    closedir(DIR);

}

# ---------------------------------------- Send update notifications, meta only

{

    my $filename;
 
    $target=~/(.*)\/([^\/]+)$/;
    my $srcf=$2.'.meta';
    opendir(DIR,$1);
    while ($filename=readdir(DIR)) {
       if ($filename=~/$srcf\.(\w+)$/) {
	   my $subhost=$1;
           if ($subhost ne 'meta') {
	       $scrout.=
                '<p>Notifying host for metadata only '.$subhost.':';
               print $logfile 
                "\nNotifying host for metadata only '.$subhost.':'";
               my $reply=&Apache::lonnet::critical(
                                'update:'.$target.'.meta',$subhost);
               $scrout.=$reply;
               print $logfile $reply;              
           }
       }
    }
    closedir(DIR);

}

# ------------------------------------------------ Provide link to new resource

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

    my $thissrc=$source;
    $thissrc=~s/^\/home\/(\w+)\/public_html/\/priv\/$1/;

    my $thissrcdir=$thissrc;
    $thissrcdir=~s/\/[^\/]+$/\//;


    return $warning.$scrout.
      '<hr><a href="'.$thisdistarget.'"><font size=+2>View Target</font></a>'.
      '<p><a href="'.$thissrc.'"><font size=+2>Back to Source</font></a>'.
      '<p><a href="'.$thissrcdir.
      '"><font size=+2>Back to Source Directory</font></a>';

}

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

sub handler {
  my $r=shift;

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

# Get query string for limited number of parameters

    map {
       my ($name, $value) = split(/=/,$_);
       $value =~ tr/+/ /;
       $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
       if ($name eq 'filename') {
           unless ($ENV{'form.'.$name}) {
              $ENV{'form.'.$name}=$value;
	   }
       }
    } (split(/&/,$ENV{'QUERY_STRING'}));


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

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

  
  unless ($fn) { 
     $r->log_reason($cuname.' at '.$cudom.
         ' trying to publish empty filename', $r->filename); 
     return HTTP_NOT_FOUND;
  } 

  ($cuname,$cudom)=
    &Apache::loncacc::constructaccess($fn,$r->dir_config('lonDefDomain'));
  unless (($cuname) && ($cudom)) {
     $r->log_reason($cuname.' at '.$cudom.
         ' trying to publish file '.$ENV{'form.filename'}.
         ' ('.$fn.') - not authorized', 
         $r->filename); 
     return HTTP_NOT_ACCEPTABLE;
  }

  unless (&Apache::lonnet::homeserver($cuname,$cudom) 
          eq $r->dir_config('lonHostID')) {
     $r->log_reason($cuname.' at '.$cudom.
         ' trying to publish file '.$ENV{'form.filename'}.
         ' ('.$fn.') - not homeserver ('.
         &Apache::lonnet::homeserver($cuname,$cudom).')', 
         $r->filename); 
     return HTTP_NOT_ACCEPTABLE;
  }

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

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

unless ($ENV{'form.phase'} eq 'two') {

# --------------------------------- 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>;
  }

  %language=();

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

  %cprtag=();

  {
     my $fh=Apache::File->new($r->dir_config('lonIncludes').'/copyright.tab');
      map {
          $_=~/(\w+)\s+([\w\s\-]+)/;
          $cprtag{$1}=$2;
      } <$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"><img align=right src=/adm/lonIcons/lonlogos.gif>');
  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;
      $thisdisfn=~s/^\/home\/$cuname\/public_html\///;

      $r->print('<h2>Publishing '.
        &Apache::lonnet::filedescription($thistype).' <tt>'.
        $thisdisfn.'</tt></h2><b>Target:</b> <tt>'.$thisdistarget.'</tt><p>');
   
       if (($cuname ne $ENV{'user.name'}) || ($cudom ne $ENV{'user.domain'})) {
          $r->print('<h3><font color=red>Co-Author: '.$cuname.' at '.$cudom.
               '</font></h3>');
      }

      if (&Apache::lonnet::fileembstyle($thistype) eq 'ssi') {
          $r->print('<br><a href="/adm/diff?filename=/~'.$cuname.'/'.
                    $thisdisfn.
  	  '&versionone=priv" target=cat>Diffs with Current Version</a><p>');
      }
  
# ------------ We are publishing from $thisfn to $thistarget with $thisembstyle

       unless ($ENV{'form.phase'} eq 'two') {
         $r->print(
          '<hr>'.&publish($thisfn,$thistarget,$thisembstyle));
       } else {
         $r->print(
          '<hr>'.&phasetwo($thisfn,$thistarget,$thisembstyle,$thisdistarget)); 
       }  

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

  return OK;
}

1;
__END__