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Diff for /loncom/metadata_database/searchcat.pl between versions 1.2 and 1.55

version 1.2, 2001/04/16 12:04:41 version 1.55, 2004/04/08 15:57:32
Line 1 Line 1
 #!/usr/bin/perl  #!/usr/bin/perl
 # The LearningOnline Network  # The LearningOnline Network
 # searchcat.pl "Search Catalog" batch script  # searchcat.pl "Search Catalog" batch script
   #
   # $Id$
   #
   # 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/
   #
   ###
   
   =pod
   
   =head1 NAME
   
   B<searchcat.pl> - put authoritative filesystem data into sql database.
   
   =head1 SYNOPSIS
   
   Ordinarily this script is to be called from a loncapa cron job
   (CVS source location: F<loncapa/loncom/cron/loncapa>; typical
   filesystem installation location: F</etc/cron.d/loncapa>).
   
   Here is the cron job entry.
   
   C<# Repopulate and refresh the metadata database used for the search catalog.>
   C<10 1 * * 7    www    /home/httpd/perl/searchcat.pl>
   
   This script only allows itself to be run as the user C<www>.
   
   =head1 DESCRIPTION
   
   This script goes through a loncapa resource directory and gathers metadata.
   The metadata is entered into a SQL database.
   
   This script also does general database maintenance such as reformatting
   the C<loncapa:metadata> table if it is deprecated.
   
   This script evaluates dynamic metadata from the authors'
   F<nohist_resevaldata.db> database file in order to store it in MySQL.
   
   This script is playing an increasingly important role for a loncapa
   library server.  The proper operation of this script is critical for a smooth
   and correct user experience.
   
 # 04/14/2001 Scott Harrison  =cut
   
 # This script goes through a LON-CAPA resource  
 # directory and gathers metadata.  
 # The metadata is entered into a SQL database.  
   
 use strict;  use strict;
   
   use DBI;
   use lib '/home/httpd/lib/perl/';
   use LONCAPA::Configuration;
   use LONCAPA::lonmetadata;
   
 use IO::File;  use IO::File;
 use HTML::TokeParser;  use HTML::TokeParser;
   use GDBM_File;
 my @metalist;  use POSIX qw(strftime mktime);
 # ----------------- Code to enable 'find' subroutine listing of the .meta files  use File::Find;
 require "find.pl";  
 sub wanted {  ##
     (($dev,$ino,$mode,$nlink,$uid,$gid) = lstat($_)) &&  ## Use variables for table names so we can test this routine a little easier
     -f _ &&  my $oldname = 'metadata';
     /^.*\.meta$/ &&  my $newname = 'newmetadata';
     push(@metalist,"$dir/$_");  
   #
   # Read loncapa_apache.conf and loncapa.conf
   my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf');
   my %perlvar=%{$perlvarref};
   undef $perlvarref;
   delete $perlvar{'lonReceipt'}; # remove since sensitive (really?) & not needed
   #
   # Only run if machine is a library server
   exit if ($perlvar{'lonRole'} ne 'library');
   #
   #  Make sure this process is running from user=www
   my $wwwid=getpwnam('www');
   if ($wwwid!=$<) {
       my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
       my $subj="LON: $perlvar{'lonHostID'} User ID mismatch";
       system("echo 'User ID mismatch. searchcat.pl must be run as user www.' |\
    mailto $emailto -s '$subj' > /dev/null");
       exit 1;
 }  }
   #
 # ------------------------------------ Read httpd access.conf and get variables  # Let people know we are running
 open (CONFIG,"/etc/httpd/conf/access.conf") || die "Can't read access.conf";  open(LOG,'>'.$perlvar{'lonDaemons'}.'/logs/searchcat.log');
   print LOG '==== Searchcat Run '.localtime()."====\n";
 while ($configline=<CONFIG>) {  #
     if ($configline =~ /PerlSetVar/) {  # Connect to database
  my ($dummy,$varname,$varvalue)=split(/\s+/,$configline);  my $dbh;
         chomp($varvalue);  if (! ($dbh = DBI->connect("DBI:mysql:loncapa","www",$perlvar{'lonSqlAccess'},
         $perlvar{$varname}=$varvalue;                            { RaiseError =>0,PrintError=>0}))) {
       print LOG "Cannot connect to database!\n";
       die "MySQL Error: Cannot connect to database!\n";
   }
   # This can return an error and still be okay, so we do not bother checking.
   # (perhaps it should be more robust and check for specific errors)
   $dbh->do('DROP TABLE IF EXISTS '.$newname);
   #
   # Create the new table
   my $request = &LONCAPA::lonmetadata::create_metadata_storage($newname);
   $dbh->do($request);
   if ($dbh->err) {
       $dbh->disconnect();
       print LOG "\nMySQL Error Create: ".$dbh->errstr."\n";
       die $dbh->errstr;
   }
   #
   # find out which users we need to examine
   opendir(RESOURCES,"$perlvar{'lonDocRoot'}/res/$perlvar{'lonDefDomain'}");
   my @homeusers = 
       grep {
           &ishome("$perlvar{'lonDocRoot'}/res/$perlvar{'lonDefDomain'}/$_");
       } grep { 
           !/^\.\.?$/;
       } readdir(RESOURCES);
   closedir RESOURCES;
   #
   # Loop through the users
   foreach my $user (@homeusers) {
       print LOG "=== User: ".$user."\n";
       my $prodir=&propath($perlvar{'lonDefDomain'},$user);
       #
       # Use File::Find to get the files we need to read/modify
       find(
            {preprocess => \&only_meta_files,
   #          wanted     => \&print_filename,
   #          wanted     => \&log_metadata,
             wanted     => \&process_meta_file,
             }, 
            "$perlvar{'lonDocRoot'}/res/$perlvar{'lonDefDomain'}/$user");
   }
   #
   # Rename the table
   $dbh->do('DROP TABLE IF EXISTS '.$oldname);
   if (! $dbh->do('RENAME TABLE '.$newname.' TO '.$oldname)) {
       print LOG "MySQL Error Rename: ".$dbh->errstr."\n";
       die $dbh->errstr;
   }
   if (! $dbh->disconnect) {
       print LOG "MySQL Error Disconnect: ".$dbh->errstr."\n";
       die $dbh->errstr;
   }
   ##
   ## Finished!
   print LOG "==== Searchcat completed ".localtime()." ====\n";
   close(LOG);
   
   &write_type_count();
   &write_copyright_count();
   
   exit 0;
   
   ########################################################
   ########################################################
   ###                                                  ###
   ###          File::Find support routines             ###
   ###                                                  ###
   ########################################################
   ########################################################
   ##
   ## &only_meta_files
   ##
   ## Called by File::Find.
   ## Takes a list of files/directories in and returns a list of files/directories
   ## to search.
   sub only_meta_files {
       my @PossibleFiles = @_;
       my @ChosenFiles;
       foreach my $file (@PossibleFiles) {
           if ( ($file =~ /\.meta$/ &&            # Ends in meta
                 $file !~ /\.\d+\.[^\.]+\.meta$/  # is not for a prior version
                ) || (-d $file )) { # directories are okay
                    # but we do not want /. or /..
               push(@ChosenFiles,$file);
           }
     }      }
       return @ChosenFiles;
 }  }
 close(CONFIG);  
   
 # ------------------------------------- Make sure that database can be accessed  ##
 {  ##
     my $dbh;  ## Debugging routines, use these for 'wanted' in the File::Find call
     unless (  ##
     $dbh = DBI->connect("DBI:mysql:loncapa","www",$perlvar{'lonSqlAccess'},{ RaiseError =>0,PrintError=>0})  sub print_filename {
     ) {       my ($file) = $_;
  print "Cannot connect to database!\n";      my $fullfilename = $File::Find::name;
  exit;      if (-d $file) {
           print LOG " Got directory ".$fullfilename."\n";
       } else {
           print LOG " Got file ".$fullfilename."\n";
     }      }
       $_=$file;
 }  }
   
 # ------------------------------------------------------------- get .meta files  sub log_metadata {
 opendir(RESOURCES,"$perlvar{'lonDocRoot'}/res/$perlvar{'lonDefDomain'}");      my ($file) = $_;
 my @homeusers=grep      my $fullfilename = $File::Find::name;
           {&ishome("$perlvar{'lonDocRoot'}/res/$perlvar{'lonDefDomain'}/$_")}      return if (-d $fullfilename); # No need to do anything here for directories
           grep {!/^\.\.?$/} readdir(RESOURCES);      print LOG $fullfilename."\n";
 closedir RESOURCES;      my $ref=&metadata($fullfilename);
 foreach my $user (@homeusers) {      if (! defined($ref)) {
     &find("$perlvar{'lonDocRoot'}/res/$perlvar{'lonDefDomain'}/$user");          print LOG "    No data\n";
           return;
       }
       while (my($key,$value) = each(%$ref)) {
           print LOG "    ".$key." => ".$value."\n";
       }
       &count_copyright($ref->{'copyright'});
       $_=$file;
 }  }
   
 # -- process each file to get metadata and put into search catalog SQL database  
 foreach my $m (@metalist) {  
     my $ref=&metadata($m);  
     my $sth=$dbh->prepare('insert into metadata values ('.  
   delete($ref->{'title'}),  
   delete($ref->{'author'}).','.  
   delete($ref->{'subject'}).','.  
   delete($ref->{'url'}).','.  
   delete($ref->{'keywords'}).','.  
   delete($ref->{'version'}).','.  
   delete($ref->{'notes'}).','.  
   delete($ref->{'abstract'}).','.  
   delete($ref->{'mime'}).','.  
   delete($ref->{'language'}).','.  
   delete($ref->{'creationdate'}).','.  
   delete($ref->{'lastrevisiondate'}).','.  
   delete($ref->{'owner'}).','.  
   delete($ref->{'copyright'}).  
   ')';  
     $sth->execute();  
 }  
   
 # ----------------------------------------------------------- Clean up database  
 # Need to, perhaps, remove stale SQL database records.  
 # ... not yet implemented  
   
 # --------------------------------------------------- Close database connection  ##
 $dbh->disconnect;  ## process_meta_file
   ##   Called by File::Find. 
   ##   Only input is the filename in $_.  
   sub process_meta_file {
       my ($file) = $_;
       my $filename = $File::Find::name;
       return if (-d $filename); # No need to do anything here for directories
       #
       print LOG $filename."\n";
       #
       my $ref=&metadata($filename);
       #
       # $url is the original file url, not the metadata file
       my $url='/res/'.&declutter($filename);
       $url=~s/\.meta$//;
       print LOG "    ".$url."\n";
       #
       # Ignore some files based on their metadata
       if ($ref->{'obsolete'}) { 
           print LOG "obsolete\n"; 
           return; 
       }
       &count_copyright($ref->{'copyright'});
       if ($ref->{'copyright'} eq 'private') { 
           print LOG "private\n"; 
           return; 
       }
       #
       # Find the dynamic metadata
       my %dyn;
       if ($url=~ m:/default$:) {
           $url=~ s:/default$:/:;
       } else {
           # %dyn=&dynamicmeta($url);
           &count_type($url);
       }
       #
       $ref->{'creationdate'}     = &sqltime($ref->{'creationdate'});
       $ref->{'lastrevisiondate'} = &sqltime($ref->{'lastrevisiondate'});
       my %Data = (
                   %$ref,
                   %dyn,
                   'url'=>$url,
                   'version'=>'current');
       my ($count,$err) = &LONCAPA::lonmetadata::store_metadata($dbh,$newname,
                                                                \%Data);
       if ($err) {
           print LOG "\nMySQL Error Insert: ".$err."\n";
           die $err;
       }
       if ($count < 1) {
           print LOG "Unable to insert record into MySQL database for $url\n";
           die "Unable to insert record into MySQl database for $url";
       } else {
           print LOG "Count = ".$count."\n";
       }
       #
       # Reset $_ before leaving
       $_ = $file;
   }
   
 # ---------------------------------------------------------------- Get metadata  ########################################################
 # significantly altered from subroutine present in lonnet  ########################################################
   ###                                                  ###
   ###  &metadata($uri)                                 ###
   ###   Retrieve metadata for the given file           ###
   ###                                                  ###
   ########################################################
   ########################################################
 sub metadata {  sub metadata {
     my ($uri,$what)=@_;      my ($uri)=@_;
     my %metacache;      my %metacache=();
     $uri=&declutter($uri);      $uri=&declutter($uri);
     my $filename=$uri;      my $filename=$uri;
     $uri=~s/\.meta$//;      $uri=~s/\.meta$//;
     $uri='';      $uri='';
     unless ($metacache{$uri.'keys'}) {      if ($filename !~ /\.meta$/) { 
         unless ($filename=~/\.meta$/) { $filename.='.meta'; }          $filename.='.meta';
  my $metastring=&getfile($perlvar{'lonDocRoot'}.'/res/'.$filename);      }
         my $parser=HTML::TokeParser->new(\$metastring);      my $metastring=&getfile($perlvar{'lonDocRoot'}.'/res/'.$filename);
         my $token;      return undef if (! defined($metastring));
         while ($token=$parser->get_token) {      my $parser=HTML::TokeParser->new(\$metastring);
            if ($token->[0] eq 'S') {      my $token;
       my $entry=$token->[1];      while ($token=$parser->get_token) {
               my $unikey=$entry;          if ($token->[0] eq 'S') {
               if (defined($token->[2]->{'part'})) {               my $entry=$token->[1];
                  $unikey.='_'.$token->[2]->{'part'};               my $unikey=$entry;
       }              if (defined($token->[2]->{'part'})) { 
               if (defined($token->[2]->{'name'})) {                   $unikey.='_'.$token->[2]->{'part'}; 
                  $unikey.='_'.$token->[2]->{'name'};               }
       }              if (defined($token->[2]->{'name'})) { 
               if ($metacache{$uri.'keys'}) {                  $unikey.='_'.$token->[2]->{'name'}; 
                  $metacache{$uri.'keys'}.=','.$unikey;              }
               } else {              if ($metacache{$uri.'keys'}) {
                  $metacache{$uri.'keys'}=$unikey;                  $metacache{$uri.'keys'}.=','.$unikey;
       }              } else {
               map {                  $metacache{$uri.'keys'}=$unikey;
   $metacache{$uri.''.$unikey.'.'.$_}=$token->[2]->{$_};              }
               } @{$token->[3]};              foreach ( @{$token->[3]}) {
               unless (                  $metacache{$uri.''.$unikey.'.'.$_}=$token->[2]->{$_};
                  $metacache{$uri.''.$unikey}=$parser->get_text('/'.$entry)              } 
       ) { $metacache{$uri.''.$unikey}=              if (! ($metacache{$uri.''.$unikey}=$parser->get_text('/'.$entry))){
       $metacache{$uri.''.$unikey.'.default'};                  $metacache{$uri.''.$unikey} = 
       }                      $metacache{$uri.''.$unikey.'.default'};
           }              }
        }          } # End of ($token->[0] eq 'S')
     }      }
     return \%metacache;      return \%metacache;
 }  }
   
 # ------------------------------------------------------------ Serves up a file  ##
 # returns either the contents of the file or a -1  ## &getfile($filename)
   ##   Slurps up an entire file into a scalar.  
   ##   Returns undef if the file does not exist
 sub getfile {  sub getfile {
   my $file=shift;      my $file = shift();
   if (! -e $file ) { return -1; };      if (! -e $file ) { 
   my $fh=IO::File->new($file);          return undef; 
   my $a='';      }
   while (<$fh>) { $a .=$_; }      my $fh=IO::File->new($file);
   return $a      my $contents = '';
       while (<$fh>) { 
           $contents .= $_;
       }
       return $contents;
 }  }
   
 # ------------------------------------------------------------- Declutters URLs  ########################################################
 sub declutter {  ########################################################
     my $thisfn=shift;  ###                                                  ###
     $thisfn=~s/^$perlvar{'lonDocRoot'}//;  ###    Dynamic Metadata                              ###
     $thisfn=~s/^\///;  ###                                                  ###
     $thisfn=~s/^res\///;  ########################################################
     return $thisfn;  ########################################################
   sub dynamicmeta {
       my $url = &declutter(shift());
       $url =~ s/\.meta$//;
       my %data = ('count'         => 0,
                   'course'        => 0,
                   'course_list'   => '',
                   'avetries'      => 'NULL',
                   'avetries_list' => '',
                   'stdno'         => 0,
                   'stdno_list'    => '',
                   'usage'         => 0,
                   'usage_list'    => '',
                   'goto'          => 0,
                   'goto_list'     => '',
                   'comefrom'      => 0,
                   'comefrom_list' => '',
                   'difficulty'    => 'NULL',
                   'difficulty_list' => '',
                   'sequsage'      => '0',
                   'sequsage_list' => '',
                   'clear'         => 'NULL',
                   'technical'     => 'NULL',
                   'correct'       => 'NULL',
                   'helpful'       => 'NULL',
                   'depth'         => 'NULL',
                   'comments'      => '',                
                   );
       my ($dom,$auth)=($url=~/^(\w+)\/(\w+)\//);
       my $prodir=&propath($dom,$auth);
       #
       # Get metadata except counts
       my %evaldata;
       if (! tie(%evaldata,'GDBM_File',
                 $prodir.'/nohist_resevaldata.db',&GDBM_READER(),0640)) {
           return (undef);
       }
       my %sum=();
       my %count=();
       my %concat=();
       my %listitems=(
                      'course'       => 'add',
                      'goto'         => 'add',
                      'comefrom'     => 'add',
                      'avetries'     => 'average',
                      'stdno'        => 'add',
                      'difficulty'   => 'average',
                      'clear'        => 'average',
                      'technical'    => 'average',
                      'helpful'      => 'average',
                      'correct'      => 'average',
                      'depth'        => 'average',
                      'comments'     => 'append',
                      'usage'        => 'count'
                      );
       #
       my $regexp=$url;
       $regexp=~s/(\W)/\\$1/g;
       $regexp='___'.$regexp.'___([a-z]+)$';
       while (my ($esckey,$value)=each %evaldata) {
           my $key=&unescape($esckey);
           if ($key=~/$regexp/) {
               my ($item,$purl,$cat)=split(/___/,$key);
               $count{$cat}++;
               if ($listitems{$cat} ne 'append') {
                   if (defined($sum{$cat})) {
                       $sum{$cat}+=&unescape($value);
                       $concat{$cat}.=','.$item;
                   } else {
                       $sum{$cat}=&unescape($value);
                       $concat{$cat}=$item;
                   }
               } else {
                   if (defined($sum{$cat})) {
                       if ($evaldata{$esckey}=~/\w/) {
                           $sum{$cat}.='<hr />'.&unescape($evaldata{$esckey});
                       }
                   } else {
                       $sum{$cat}=''.&unescape($evaldata{$esckey});
       }
               }
           }
       }
       untie(%evaldata);
       # transfer gathered data to returnhash, calculate averages where applicable
       my %returnhash;
       while (my $cat=each(%count)) {
           if ($count{$cat} eq 'nan') { next; }
           if ($sum{$cat} eq 'nan') { next; }
           if ($listitems{$cat} eq 'average') {
               if ($count{$cat}) {
                   $returnhash{$cat}=int(($sum{$cat}/$count{$cat})*100.0+0.5)/100.0;
               } else {
                   $returnhash{$cat}='NULL';
               }
           } elsif ($listitems{$cat} eq 'count') {
               $returnhash{$cat}=$count{$cat};
           } else {
               $returnhash{$cat}=$sum{$cat};
           }
           $returnhash{$cat.'_list'}=$concat{$cat};
       }
       #
       # get count
       if (tie(my %evaldata,'GDBM_File',
               $prodir.'/nohist_accesscount.db',&GDBM_READER(),0640)) {
    my $escurl=&escape($url);
    if (! exists($evaldata{$escurl})) {
       $returnhash{'count'}=0;
    } else {
       $returnhash{'count'}=$evaldata{$escurl};
    }
    untie %evaldata;
       }
       return %returnhash;
   }
   
   ########################################################
   ########################################################
   ###                                                  ###
   ###   Counts                                         ###
   ###                                                  ###
   ########################################################
   ########################################################
   {
   
   my %countext;
   
   sub count_type {
       my $file=shift;
       $file=~/\.(\w+)$/;
       my $ext=lc($1);
       $countext{$ext}++;
 }  }
   
 # --------------------------------------- Is this the home server of an author?  sub write_type_count {
 # (copied from lond, modification of the return value)      open(RESCOUNT,'>/home/httpd/html/lon-status/rescount.txt');
       while (my ($extension,$count) = each(%countext)) {
    print RESCOUNT $extension.'='.$count.'&';
       }
       print RESCOUNT 'time='.time."\n";
       close(RESCOUNT);
   }
   
   } # end of scope for %countext
   
   {
   
   my %copyrights;
   
   sub count_copyright {
       $copyrights{@_[0]}++;
   }
   
   sub write_copyright_count {
       open(COPYCOUNT,'>/home/httpd/html/lon-status/copyrightcount.txt');
       while (my ($copyright,$count) = each(%copyrights)) {
    print COPYCOUNT $copyright.'='.$count.'&';
       }
       print COPYCOUNT 'time='.time."\n";
       close(COPYCOUNT);
   }
   
   } # end of scope for %copyrights
   
   ########################################################
   ########################################################
   ###                                                  ###
   ###   Miscellanous Utility Routines                  ###
   ###                                                  ###
   ########################################################
   ########################################################
   ##
   ## &ishome($username)
   ##   Returns 1 if $username is a LON-CAPA author, 0 otherwise
   ##   (copied from lond, modification of the return value)
 sub ishome {  sub ishome {
     my $author=shift;      my $author=shift;
     $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;      $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
Line 162  sub ishome { Line 553  sub ishome {
     }      }
 }  }
   
 # -------------------------------------------- Return path to profile directory  ##
 # (copied from lond)  ## &propath($udom,$uname)
   ##   Returns the path to the users LON-CAPA directory
   ##   (copied from lond)
 sub propath {  sub propath {
     my ($udom,$uname)=@_;      my ($udom,$uname)=@_;
     $udom=~s/\W//g;      $udom=~s/\W//g;
Line 173  sub propath { Line 566  sub propath {
     my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";      my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
     return $proname;      return $proname;
 }   } 
   
   ##
   ## &sqltime($timestamp)
   ##
   ## Convert perl $timestamp to MySQL time.  MySQL expects YYYY-MM-DD HH:MM:SS
   ##
   sub sqltime {
       my ($time) = @_;
       my $mysqltime;
       if ($time =~ 
           /(\d+)-(\d+)-(\d+) # YYYY-MM-DD
           \s                 # a space
           (\d+):(\d+):(\d+)  # HH:MM::SS
           /x ) { 
           # Some of the .meta files have the time in mysql
           # format already, so just make sure they are 0 padded and
           # pass them back.
           $mysqltime = sprintf('%04d-%02d-%02d %02d:%02d:%02d',
                                $1,$2,$3,$4,$5,$6);
       } elsif ($time =~ /^\d+$/) {
           my @TimeData = gmtime($time);
           # Alter the month to be 1-12 instead of 0-11
           $TimeData[4]++;
           # Alter the year to be from 0 instead of from 1900
           $TimeData[5]+=1900;
           $mysqltime = sprintf('%04d-%02d-%02d %02d:%02d:%02d',
                                @TimeData[5,4,3,2,1,0]);
       } else {
           print LOG "    Unable to decode time ".$time."\n";
           $mysqltime = 0;
       }
       return $mysqltime;
   }
   
   ##
   ## &declutter($filename)
   ##   Given a filename, returns a url for the filename.
   sub declutter {
       my $thisfn=shift;
       $thisfn=~s/^$perlvar{'lonDocRoot'}//;
       $thisfn=~s/^\///;
       $thisfn=~s/^res\///;
       return $thisfn;
   }
   
   ##
   ## Escape / Unescape special characters
   sub unescape {
       my $str=shift;
       $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
       return $str;
   }
   
   sub escape {
       my $str=shift;
       $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
       return $str;
   }
Removed from v.1.2  
changed lines
  Added in v.1.55

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