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Diff for /loncom/interface/lonindexer.pm between versions 1.10 and 1.30

version 1.10, 2001/06/15 19:05:26 version 1.30, 2001/12/13 13:59:22
Line 1 Line 1
 # The LearningOnline Network with CAPA  # The LearningOnline Network with CAPA
 # Directory Indexer  # Directory Indexer
 # (Login Screen  #
 # 5/21/99,5/22,5/25,5/26,5/31,6/2,6/10,7/12,7/14 Gerd Kortemeyer)  # $Id$
   #
   # 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/
   #
   # YEAR=1999
   # 5/21/99, 5/22,5/25,5/26,5/31,6/2,6/10,7/12,7/14 Gerd Kortemeyer)
 # 11/23 Gerd Kortemeyer  # 11/23 Gerd Kortemeyer
   # YEAR=2000
 # 07/20-08/04 H.K. Ng  # 07/20-08/04 H.K. Ng
 #  # YEAR=2001
 # 05/9-05/19/2001 H. K. Ng  # 05/9-05/19/2001 H. K. Ng
 # 05/21/2001 H. K. Ng  # 05/21/2001 H. K. Ng
 # 05/23/2001 H. K. Ng  # 05/23/2001 H. K. Ng
 # 05/31/2001 Scott Harrison  # 5/31,6/1,6/2,6/15 Scott Harrison
 # 06/01/2001 Scott Harrison  # 6/26,7/8 H. K. Ng
 # 06/02/2001 Scott Harrison  # 8/6,8/7,8/10 Scott Harrison
 # 06/15/2001 Scott Harrison  # 8/14 H. K. Ng
   # 8/28,10/15,11/28,11/29 Scott Harrison
   # 11/30 Matthew Hall
   # 12/11,12/13 Scott Harrison
   #
   ###
   
   ###############################################################################
   ##                                                                           ##
   ## ORGANIZATION OF THIS PERL MODULE                                          ##
   ##                                                                           ##
   ## 1. Description of functions                                               ##
   ## 2. Modules used by this module                                            ##
   ## 3. Choices for different output views (detailed, summary, xml, etc)       ##
   ## 4. BEGIN block (to be run once after compilation)                         ##
   ## 5. Handling routine called via Apache and mod_perl                        ##
   ## 6. Other subroutines                                                      ##
   ##                                                                           ##
   ###############################################################################
   
 package Apache::lonindexer;  package Apache::lonindexer;
   
   # ------------------------------------------------- modules used by this module
 use strict;  use strict;
 use Apache::lonnet();  use Apache::lonnet();
   use Apache::loncommon();
 use Apache::Constants qw(:common);  use Apache::Constants qw(:common);
 use Apache::File;  use Apache::File;
 use GDBM_File;  use GDBM_File;
   
 my %hash;  # ---------------------------------------- variables used throughout the module
 my %dirs;  my %hash; # tied to a user-specific gdbm file
 my %language;  my %dirs; # keys are directories, values are the open/close status
 my $hidden;  my %language; # has the reference information present in language.tab
 my $extrafield;  
 my $fnum;  # ----- Values which are set by the handler subroutine and are accessible to
   # -----     other methods.
   my $extrafield; # default extra table cell
   my $fnum; # file counter
   my $dnum; # directory counter
   
   # ---------------------------------------------------------------------- BEGIN
 sub BEGIN {  sub BEGIN {
     my $fh=Apache::File->new($Apache::lonnet::perlvar{'lonTabDir'}.'/language.tab');  
     map {  
  $_=~/(\w+)\s+([\w\s\-]+)/;  
  $language{$1}=$2;  
     } <$fh>;  
 }  }
   
   # ----------------------------- Handling routine called via Apache and mod_perl
 sub handler {  sub handler {
     my $r = shift;      my $r = shift;
     $r->content_type('text/html');      $r->content_type('text/html');
     $r->send_http_header;      $r->send_http_header;
     return OK if $r->header_only;      return OK if $r->header_only;
     $fnum=0;      $fnum=0;
       $dnum=0;
       untie %hash;
   
   # ------------------------------------- read in machine configuration variables
     my $iconpath= $r->dir_config('lonIconsURL') . "/";      my $iconpath= $r->dir_config('lonIconsURL') . "/";
     my $domain  = $r->dir_config('lonDefDomain');      my $domain  = $r->dir_config('lonDefDomain');
     my $role    = $r->dir_config('lonRole');      my $role    = $r->dir_config('lonRole');
Line 50  sub handler { Line 102  sub handler {
     my $lonhost = $r->dir_config('lonHostID');      my $lonhost = $r->dir_config('lonHostID');
     my $tabdir  = $r->dir_config('lonTabDir');      my $tabdir  = $r->dir_config('lonTabDir');
   
 #    my $iconpath='/res/adm/pages/indexericons/';  
     my $fileclr='#ffffe6';      my $fileclr='#ffffe6';
       my $line;
       my (@attrchk,@openpath);
       my $uri=$r->uri;
   
 # -------------------------------------- see if called from an interactive mode  # -------------------------------------- see if called from an interactive mode
     map {      &get_unprocessed_cgi();
        my ($name, $value) = split(/=/,$_);  
        $value =~ tr/+/ /;  
        $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;  
        if ($name eq 'catalogmode') {  
            $ENV{'form.'.$name}=$value;  
    }  
     } (split(/&/,$ENV{'QUERY_STRING'}));  
   
     $hidden=''; my $closebutton='';      my $closebutton='';
     my $groupimportbutton='';      my $groupimportbutton='';
     my $colspan='';       my $colspan=''; 
     if ($ENV{'form.catalogmode'} eq 'interactive') {  
  $extrafield='<td bgcolor="'.$fileclr.'" valign="bottom">'.      $extrafield='';
     '<a name="$anchor"><img src="'.$iconpath.'whitespace1.gif"'.      my $diropendb = 
     ' border="0"></td>';   "/home/httpd/perl/tmp/$domain\_$ENV{'user.name'}_indexer.db";
  $colspan=" colspan='2' ";  
  $hidden=<<END;      if (tie(%hash,'GDBM_File',$diropendb,&GDBM_WRCREAT,0640)) {
 <input type='hidden' name='catalogmode' value='interactive'>   if ($ENV{'form.launch'} eq '1') {
 END      &start_fresh_session();
         $closebutton=<<END;   }
   
   # -------------------- refresh environment with user database values (in %hash)
    if ($hash{'mode_catalog'} eq 'interactive') {
       $ENV{'form.catalogmode'}='interactive';
    }
    if ($hash{'mode_catalog'} eq 'groupimport') {
       $ENV{'form.catalogmode'}='groupimport';
    }
   
   # --------------------- define extra fields and buttons in case of special mode
    if ($ENV{'form.catalogmode'} eq 'interactive') {
       $hash{'mode_catalog'}='interactive';
       $extrafield='<td bgcolor="'.$fileclr.'" valign="bottom">'.
    '<a name="$anchor"><img src="'.$iconpath.'whitespace1.gif"'.
    ' border="0" /></td>';
       $colspan=" colspan='2' ";
               $closebutton=<<END;
 <input type="button" name="close" value='CLOSE' onClick="self.close()">  <input type="button" name="close" value='CLOSE' onClick="self.close()">
 END  END
     }          }
     elsif ($ENV{'form.catalogmode'} eq 'groupimport') {   elsif ($ENV{'form.catalogmode'} eq 'groupimport') {
  $extrafield='<td bgcolor="'.$fileclr.'" valign="bottom">'.      $hash{'mode_catalog'}='groupimport';
     '<a name="$anchor"><img src="'.$iconpath.'whitespace1.gif"'.      $extrafield='<td bgcolor="'.$fileclr.'" valign="bottom">'.
     ' border="0"></td>';   '<a name="$anchor"><img src="'.$iconpath.'whitespace1.gif"'.
  $colspan=" colspan='2' ";   ' border="0" /></td>';
  $hidden=<<END;      $colspan=" colspan='2' ";
 <input type='hidden' name='catalogmode' value='groupimport'>              $closebutton=<<END;
 END  
         $closebutton=<<END;  
 <input type="button" name="close" value='CLOSE' onClick="self.close()">  <input type="button" name="close" value='CLOSE' onClick="self.close()">
 END  END
         $groupimportbutton=<<END;              $groupimportbutton=<<END;
 <input type="button" name="groupimport" value='GROUP IMPORT' onClick="javascript:select_group()">  <input type="button" name="groupimport" value='GROUP IMPORT'
   onClick="javascript:select_group()">
 END  END
     }          }
   
     my $catalogmodefunctions='';  # ------ set catalogmodefunctions to have extra needed javascript functionality
     if ($ENV{'form.catalogmode'} eq 'interactive' or   my $catalogmodefunctions='';
  $ENV{'form.catalogmode'} eq 'groupimport') {   if ($ENV{'form.catalogmode'} eq 'interactive' or
  $catalogmodefunctions=<<END;      $ENV{'form.catalogmode'} eq 'groupimport') {
       $catalogmodefunctions=<<END;
 function select_data(title,url) {  function select_data(title,url) {
     changeTitle(title);      changeTitle(title);
     changeURL(url);      changeURL(url);
     self.close();      self.close();
 }  }
 function save_group() {  
     for (var num=0; num<document.forms.fnum.fnum.value; num++) {  
  if (eval("document.forms.form"+num+".filelink.checked")) {  
     alert(eval("document.forms.form"+num+".title.value")+  
        eval("document.forms.form"+num+".filelink.value"));  
  }  
     }  
 }  
 function select_group() {  function select_group() {
     var linkflag=false;      window.location="/adm/groupsort?catalogmode=groupimport&acts="+document.forms.fileattr.acts.value;
     for (var num=0; num<document.forms.fnum.fnum.value; num++) {  
  if (eval("document.forms.form"+num+".filelink.checked")) {  
 //    alert(eval("document.forms.form"+num+".title.value")+  
 //       eval("document.forms.form"+num+".filelink.value"));  
     insertRowInLastRow();  
     placeResourceInLastRow(  
    eval("document.forms.form"+num+".title.value"),  
    eval("document.forms.form"+num+".filelink.value"),  
    linkflag  
    );  
     linkflag=true;  
  }  
     }  
     opener.editmode=0;  
     opener.notclear=0;  
     opener.linkmode=0;  
     opener.infoclear();  
     opener.draw();  
 }  
 function insertRowInLastRow() {  
     opener.insertrow(opener.maxrow);  
     opener.addobj(opener.maxrow,'e&2');  
 }  
 function placeResourceInLastRow (title,url,linkflag) {  
     opener.newresource(opener.maxrow,2,opener.escape(title),opener.escape(url),'false','normal');  
     opener.save();  
     opener.mostrecent=opener.obj.length-1;  
     if (linkflag) {  
  opener.joinres(opener.linkmode,opener.mostrecent,0);  
     }  
     opener.linkmode=opener.mostrecent;  
 }  }
 function changeTitle(val) {  function changeTitle(val) {
     if (opener.inf.document.forms.resinfo.elements.t) {      if (opener.inf.document.forms.resinfo.elements.t) {
Line 155  function changeURL(val) { Line 181  function changeURL(val) {
     }      }
 }  }
 END  END
           }
    if ($ENV{'form.catalogmode'} eq 'groupimport') {
       $catalogmodefunctions.=<<END;
   var acts='';
   function queue(val) {
       if (eval("document.forms."+val+".filelink.checked")) {
    var l=val.length;
    var v=val.substring(4,l);
    document.forms.fileattr.acts.value+='1a'+v+'b';
       }
       else {
    var l=val.length;
    var v=val.substring(4,l);
    document.forms.fileattr.acts.value+='0a'+v+'b';
     }      }
   }
   function rep_dirpath(suffix,val) {
       eval("document.forms.dirpath"+suffix+".acts.value=val");
   }
   END
    }
   
 # ---------------------------------------------------------------- Print Header  # ---------------------------------------------------------------- Print Header
     $r->print(<<ENDHEADER);   $r->print(<<ENDHEADER);
 <html>  <html>
 <head>  <head>
 <title>The LearningOnline Network With CAPA Directory Browser</title>  <title>The LearningOnline Network With CAPA Directory Browser</title>
   
 <SCRIPT language="javascript">  <script type="text/javascript">
 $catalogmodefunctions  $catalogmodefunctions
 function openWindow(url, wdwName, w, h, toolbar,scrollbar) {  function openWindow(url, wdwName, w, h, toolbar,scrollbar) {
     var options = "width=" + w + ",height=" + h + ",";      var options = "width=" + w + ",height=" + h + ",";
Line 172  function openWindow(url, wdwName, w, h, Line 218  function openWindow(url, wdwName, w, h,
     var newWin = window.open(url, wdwName, options);      var newWin = window.open(url, wdwName, options);
     newWin.focus();      newWin.focus();
 }  }
 </SCRIPT>  function gothere(val) {
       window.location=val+'?acts='+document.forms.fileattr.acts.value;
   }
   </script>
   
 </head>  </head>
 <body bgcolor="#FFFFFF">  <body bgcolor="#FFFFFF">
 ENDHEADER  ENDHEADER
   
     my $line;  # - Evaluate actions from previous page (both cumulatively and chronologically)
     my (@attrchk,@openpath);          if ($ENV{'form.catalogmode'} eq 'groupimport') {
     my $uri=$r->uri;      my $acts=$ENV{'form.acts'};
       my @Acts=split(/b/,$acts);
     $r->print("<h2><font color=\"\#888888\">The LearningOnline With CAPA Network Directory Browser</font></h2>\n");      my %ahash;
       my %achash;
     my $diropen = "/home/httpd/perl/tmp/$domain\_$ENV{'user.name'}_indexer.db";      my $ac=0;
       # some initial hashes for working with data
     if (tie(%hash,'GDBM_File',$diropen,&GDBM_WRCREAT,0640)) {      foreach (@Acts) {
    my ($state,$ref)=split(/a/);
    $ahash{$ref}=$state;
    $achash{$ref}=$ac;
    $ac++;
       }
       # sorting through the actions and changing the tied database hash
       foreach (sort {$achash{$a}<=>$achash{$b}} (keys %ahash)) {
    my $key=$_;
    if ($ahash{$key} eq '1') {
       $hash{'store_'.$hash{'pre_'.$key.'_link'}}=
    $hash{'pre_'.$key.'_title'};
       $hash{'storectr_'.$hash{'pre_'.$key.'_link'}}=
    $hash{'storectr'}+0;
       $hash{'storectr'}++;
    }
    if ($ahash{$key} eq '0') {
       if ($hash{'store_'.$hash{'pre_'.$key.'_link'}}) {
    delete $hash{'store_'.$hash{'pre_'.$key.'_link'}};
       }
    }
       }
       # deleting the previously cached listing
       foreach (keys %hash) {
    if ($_ =~ /^pre_/ && $_ =~/link$/) {
       my $key = $_;
       $key =~ s/^pre_//;
       $key =~ s/_[^_]*$//;
       delete $hash{'pre_'.$key.'_title'};
       delete $hash{'pre_'.$key.'_link'};
    }
       }
    }
   
   # ---------------------------------------------------------------- output title
    $r->print('<h2><font color="#888888">The LearningOnline With CAPA '.
     'Network Directory Browser</font></h2>'."\n");
   # ---------------------------------- get state of file attributes to be showing
  if ($ENV{'form.attrs'} ne "") {   if ($ENV{'form.attrs'} ne "") {
     for (my $i=0; $i<=5; $i++) {      for (my $i=0; $i<=6; $i++) {
  delete $hash{'display_attrs_'.$i};   delete $hash{'display_attrs_'.$i};
  if ($ENV{'form.attr'.$i} == 1) {   if ($ENV{'form.attr'.$i} == 1) {
     $attrchk[$i] = "checked";      $attrchk[$i] = "checked";
Line 197  ENDHEADER Line 282  ENDHEADER
  }   }
     }      }
  } else {   } else {
     for (my $i=0; $i<=5; $i++) {      for (my $i=0; $i<=6; $i++) {
  $attrchk[$i] = "checked" if $hash{'display_attrs_'.$i} == 1;   $attrchk[$i] = "checked" if $hash{'display_attrs_'.$i} == 1;
     }      }
  }   }
     $r->print(<<END);  # ------------------------------- output state of file attributes to be showing
 <b><font color="#666666">Display file attributes</font></b><br>   $r->print(<<END);
 <form method="post" name="fileattr" action="$uri" enctype="application/x-www-form-urlencoded">  <b><font color="#666666">Display file attributes</font></b><br />
   <form method="post" name="fileattr" action="$uri"
    enctype="application/x-www-form-urlencoded">
 <table border=0><tr>  <table border=0><tr>
 <td><input type=checkbox name=attr0 value="1" $attrchk[0]> Size</td>  <td><input type="checkbox" name="attr0" value="1" $attrchk[0] /> Size</td>
 <td><input type=checkbox name=attr1 value="1" $attrchk[1]> Last access</td>  <td><input type="checkbox" name="attr1" value="1" $attrchk[1] /> Last access</td>
 <td><input type=checkbox name=attr2 value="1" $attrchk[2]> Last modified</td>  <td><input type="checkbox" name="attr2" value="1" $attrchk[2] /> Last modified</td>
   <td><input type="checkbox" name="attr6" value="1" $attrchk[6] /> All versions</td>
 </tr><tr>  </tr><tr>
 <td><input type=checkbox name=attr3 value="1" $attrchk[3]> Author</td>  <td><input type="checkbox" name="attr3" value="1" $attrchk[3] /> Author</td>
 <td><input type=checkbox name=attr4 value="1" $attrchk[4]> Keywords</td>  <td><input type="checkbox" name="attr4" value="1" $attrchk[4] /> Keywords</td>
 <td><input type=checkbox name=attr5 value="1" $attrchk[5]> Language</td>  <td><input type="checkbox" name="attr5" value="1" $attrchk[5] /> Language</td>
   <td>&nbsp;</td>
 </tr></table>  </tr></table>
 <input type="submit" name="attrs" value="Review">&nbsp;  <input type="hidden" name="dirPointer" value="on" />
 <input type="submit" name="attrs" value="Refresh">  <input type="hidden" name="acts" value="" />
 $hidden  <input type="submit" name="attrs" value="Review" />&nbsp;
   <input type="submit" name="attrs" value="Refresh" />
 $closebutton  $closebutton
 $groupimportbutton  $groupimportbutton
 </form>  </form>
 END  END
   
     my $titleclr="#ddffff";  # ----------------- output starting row to the indexed file/directory hierarchy
     $r->print("<table border=0><tr><td bgcolor=#eeeeee>\n");          my $titleclr="#ddffff";
     $r->print("<table border=0><tr>\n");          $r->print("<table border=0><tr><td bgcolor=#eeeeee>\n");
     $r->print("<td $colspan bgcolor=$titleclr><b>Name</b></td>\n");   $r->print("<table border=0><tr>\n");
     $r->print("<td bgcolor=$titleclr align=right><b>Size (bytes) </b></td>\n") if ($hash{'display_attrs_0'} == 1);   $r->print("<td $colspan bgcolor=$titleclr><b>Name</b></td>\n");
     $r->print("<td bgcolor=$titleclr><b>Last accessed</b></td>\n") if ($hash{'display_attrs_1'} == 1);   $r->print("<td bgcolor=$titleclr align=right><b>Size (bytes) ".
     $r->print("<td bgcolor=$titleclr><b>Last modified</b></td>\n") if ($hash{'display_attrs_2'} == 1);    "</b></td>\n") if ($hash{'display_attrs_0'} == 1);
     $r->print("<td bgcolor=$titleclr><b>Author(s)</b></td>\n") if ($hash{'display_attrs_3'} == 1);   $r->print("<td bgcolor=$titleclr><b>Last accessed</b></td>\n") 
     $r->print("<td bgcolor=$titleclr><b>Keywords</b></td>\n") if ($hash{'display_attrs_4'} == 1);      if ($hash{'display_attrs_1'} == 1);
     $r->print("<td bgcolor=$titleclr><b>Language</b></td>\n") if ($hash{'display_attrs_5'} == 1);   $r->print("<td bgcolor=$titleclr><b>Last modified</b></td>\n")
     $r->print("</tr>");      if ($hash{'display_attrs_2'} == 1);
    $r->print("<td bgcolor=$titleclr><b>Author(s)</b></td>\n")
       if ($hash{'display_attrs_3'} == 1);
    $r->print("<td bgcolor=$titleclr><b>Keywords</b></td>\n")
       if ($hash{'display_attrs_4'} == 1);
    $r->print("<td bgcolor=$titleclr><b>Language</b></td>\n")
       if ($hash{'display_attrs_5'} == 1);
    $r->print("</tr>");
   
  map {  # ----------------- read in what directories have previously been set to "open"
    foreach (keys %hash) {
     if ($_ =~ /^diropen_status_/) {      if ($_ =~ /^diropen_status_/) {
  my $key = $_;   my $key = $_;
  $key =~ s/^diropen_status_//;   $key =~ s/^diropen_status_//;
  $dirs{$key} = $hash{$_};   $dirs{$key} = $hash{$_};
     }      }
  } keys %hash;   }
   
  if ($ENV{'form.openuri'}) {  # take care of review and refresh options   if ($ENV{'form.openuri'}) {  # take care of review and refresh options
     my $uri=$ENV{'form.openuri'};      my $uri=$ENV{'form.openuri'};
Line 256  END Line 354  END
  $dirs{$uri} = 'open';   $dirs{$uri} = 'open';
     }      }
  }   }
   
  my $toplevel = "/res/";   my $bredir = $ENV{'form.dirPointer'};
    my $toplevel;
  my $indent = 0;   my $indent = 0;
  &scanDir ($r,$toplevel,$indent);   $uri = $uri.'/' if $uri !~ /.*\/$/;
   
    if ($bredir ne "on") {
       $hash{'top.level'} = $uri;
       $toplevel = $uri;
   
    } else {
       $toplevel = $hash{'top.level'};
    }
   
   # -------------------------------- if not at top level, provide an uplink arrow
    if ($toplevel ne "/res/"){
       my (@uri_com) = split(/\//,$uri);
       pop @uri_com;
       my $upone = join('/',@uri_com);
       my @list = qw (0);
       &display_line ($r,'opened',$upone.'&viewOneUp',0,$upone,@list);
       $indent = 1;
    }
   
   # -------- recursively go through all the directories and output as appropriate
    &scanDir ($r,$toplevel,$indent,\%hash);
   
   # ---------------------------- embed hidden information useful for group import
  $r->print("<form name='fnum'>");   $r->print("<form name='fnum'>");
  $r->print("<input type='hidden' name='fnum' value='$fnum'></form>");   $r->print("<input type='hidden' name='fnum' value='$fnum'></form>");
   
   # -------------------------------------------------------------- end the tables
  $r->print("</table>");   $r->print("</table>");
  $r->print("</td></tr></table>");   $r->print("</td></tr></table>");
   
   # --------------------------------------------------- end the output and return
  $r->print("</body></html>\n");   $r->print("</body></html>\n");
  untie(%hash);   untie(%hash);
     } else {      } else {
  $r->print("Unable to tie hash to db file");   $r->print('<html><head></head><body>Unable to tie hash to db '.
     'file</body></html>');
    return OK;
     }      }
     return OK;      return OK;
 }  }
   
   # ----------------------------------------------- recursive scan of a directory
 # --------------------recursive scan of a directory  
 sub scanDir {  sub scanDir {
     my ($r,$startdir,$indent)=@_;      my ($r,$startdir,$indent,$hashref)=@_;
     my ($compuri,$curdir);      my ($compuri,$curdir);
     my $dirptr=16384;      my $dirptr=16384;
     $indent++;      $indent++;
Line 286  sub scanDir { Line 412  sub scanDir {
     foreach my $line (@list) {      foreach my $line (@list) {
  my ($strip,$dom,$foo,$testdir,$foo)=split(/\&/,$line,5);    my ($strip,$dom,$foo,$testdir,$foo)=split(/\&/,$line,5); 
  next if $strip =~ /.*\.meta$/;   next if $strip =~ /.*\.meta$/;
    my (@fileparts) = split(/\./,$strip);
    if ($hash{'display_attrs_6'} != 1) {
       if (scalar(@fileparts) >= 3) {
    my $fext = pop @fileparts;
    my $ov = pop @fileparts;
    my $fname = join ('.',@fileparts,$fext);
    next if (grep /$fname/,@list and $ov =~ /\d+/);
       }
    }
   
  if ($dom eq "domain") {   if ($dom eq "domain") {
     $compuri = join('',$strip,"/");  # domain list has /res/<domain name>      $compuri = join('',$strip,"/");  # dom list has /res/<domain name>
     $curdir = $compuri;      $curdir = $compuri;
  } else {   } else {
     $compuri = join('',$startdir,$strip,"/"); # user, dir & file having name only, i.e., w/o path      # user, dir & file have name only, i.e., w/o path
       $compuri = join('',$startdir,$strip,"/");
     $curdir = $startdir;      $curdir = $startdir;
  }   }
  my $diropen = 0;   my $diropen = "closed";
  if (($dirptr&$testdir) or ($dom =~ /^(domain|user)$/)) {   if (($dirptr&$testdir) or ($dom =~ /^(domain|user)$/)) {
     while (my ($key,$val)= each %dupdirs) {      while (my ($key,$val)= each %dupdirs) {
  if ($key eq $compuri and $val eq "open") {   if ($key eq $compuri and $val eq "open") {
     $diropen = 1;      $diropen = "opened";
     delete $dupdirs{key},$dirs{$key};      delete $dupdirs{key},$dirs{$key};
  }   }
     }      }
  }   }
  &display_line($r,$diropen,$line,$indent,$curdir,@list);   &display_line($r,$diropen,$line,$indent,$curdir,$hashref,@list);
  &scanDir ($r,$compuri,$indent) if $diropen == 1;   &scanDir ($r,$compuri,$indent) if $diropen eq "opened";
     }      }
     $indent--;      $indent--;
 }  }
   
 # ----------------- get complete matched list based on the uri ------  # --------------- get complete matched list based on the uri (returns an array)
 sub get_list {  sub get_list {
     my ($r,$uri)=@_;      my ($r,$uri)=@_;
     my @list;      my @list;
Line 316  sub get_list { Line 453  sub get_list {
     $luri =~ s/\//_/g;      $luri =~ s/\//_/g;
   
     if ($ENV{'form.attrs'} eq "Refresh") {      if ($ENV{'form.attrs'} eq "Refresh") {
  map {   foreach (keys %hash) {
     delete $hash{$_} if ($_ =~ /^dirlist_files_/);      delete $hash{$_} if ($_ =~ /^dirlist_files_/);
     } keys %hash;      }
     }      }
   
     if ($hash{'dirlist_files'.$luri}) {      if ($hash{'dirlist_files'.$luri}) {
Line 330  sub get_list { Line 467  sub get_list {
     return @list=&match_ext($r,@list);      return @list=&match_ext($r,@list);
 }  }
   
 #-------------------------- filters out files based on extensions  # -------------------- filters out files based on extensions (returns an array)
 sub match_ext {  sub match_ext {
     my ($r,@packlist)=@_;      my ($r,@packlist)=@_;
     my @trimlist;      my @trimlist;
Line 338  sub match_ext { Line 475  sub match_ext {
     my @fileext;      my @fileext;
     my $dirptr=16384;      my $dirptr=16384;
   
     my $tabdir  = $r->dir_config('lonTabDir');  
     my $fn = $tabdir."/filetypes.tab";  
     if (-e $fn) {  
  my $FH=Apache::File->new($fn);  
  my @content=<$FH>;  
  foreach my $line (@content) {  
     (my $ext,my $foo) = split /\s+/,$line;  
     push @fileext,$ext;  
  }  
     }  
     foreach my $line (@packlist) {      foreach my $line (@packlist) {
  chomp $line;   chomp $line;
  $line =~ s/^\/home\/httpd\/html//;   $line =~ s/^\/home\/httpd\/html//;
Line 358  sub match_ext { Line 485  sub match_ext {
  my $fext = pop(@filecom);   my $fext = pop(@filecom);
  my $fnptr = $unpackline[3]&$dirptr;   my $fnptr = $unpackline[3]&$dirptr;
   if ($fnptr == 0 and $unpackline[3] ne "") {    if ($fnptr == 0 and $unpackline[3] ne "") {
     foreach my $nextline (@fileext) {      my $embstyle = &Apache::loncommon::fileembstyle($fext);
  push @trimlist,$line if $nextline eq $fext;              push @trimlist,$line if (defined($embstyle) && 
     }       $embstyle ne 'hdn' );
  } else {   } else {
     push @trimlist,$line;      push @trimlist,$line;
  }   }
Line 369  sub match_ext { Line 496  sub match_ext {
     return @trimlist;      return @trimlist;
 }  }
   
 #------------------- displays one line in appropriate table format  # ------------------------------- displays one line in appropriate table format
 sub display_line{  sub display_line {
     my ($r,$diropen,$line,$indent,$startdir,@list)=@_;      my ($r,$diropen,$line,$indent,$startdir,$hashref,@list)=@_;
     my (@pathfn, $fndir, $fnptr);      my (@pathfn, $fndir, $fnptr);
     my $dirptr=16384;      my $dirptr=16384;
     my $fileclr="#ffffe6";      my $fileclr="#ffffe6";
     my $iconpath= $r->dir_config('lonIconsURL') . "/";      my $iconpath= $r->dir_config('lonIconsURL') . "/";
 #    my $iconpath="/res/adm/pages/indexericons/";  
   
     my @filecom = split (/\&/,$line);      my @filecom = split (/\&/,$line);
     my @pathcom = split (/\//,$filecom[0]);      my @pathcom = split (/\//,$filecom[0]);
     my $listname = $pathcom[scalar(@pathcom)-1];      my $listname = $pathcom[scalar(@pathcom)-1];
     my $fnptr = $filecom[3]&$dirptr;      my $fnptr = $filecom[3]&$dirptr;
     my $msg = 'View '.$filecom[0].' resources';      my $msg = 'View '.$filecom[0].' resources';
     $msg = 'Close '.$filecom[0].' directory' if $diropen == 1;      $msg = 'Close '.$filecom[0].' directory' if $diropen eq "opened";
   
     my $tabtag="</td>";      my $tabtag="</td>";
     my $i=0;      my $i=0;
   
     while ($i<=5) {      while ($i<=5) {
 # my $key="form.attr".$i;   $tabtag=join('',$tabtag,"<td bgcolor=",$fileclr,">&nbsp;</td>")
 # $tabtag=join('',$tabtag,"<td bgcolor=",$fileclr,">&nbsp;</td>") if $ENV{$key} == 1;      if $hash{'display_attrs_'.$i} == 1;
  $tabtag=join('',$tabtag,"<td bgcolor=",$fileclr,">&nbsp;</td>") if $hash{'display_attrs_'.$i} == 1;  
  $i++;   $i++;
     }      }
   
   # display uplink arrow
       if ($filecom[1] eq "viewOneUp") {
    $r->print("<tr>$extrafield");
    $r->print("<td bgcolor=$fileclr valign=bottom>\n");
    $r->print ('<form method="post" name="dirpathUP" action="'.$startdir.
      '/" '.
      'onSubmit="return rep_dirpath(\'UP\','.
      'document.forms.fileattr.acts.value)" '.
      'enctype="application/x-www-form-urlencoded"'.
                      '>'."\n");
    $r->print ('<input type=hidden name=openuri value="'.
      $startdir.'">'."\n");
    $r->print ('<input type="hidden" name="acts" value="">'."\n");
    $r->print ('<input src="'.$iconpath.'arrow_up.gif"');
    $r->print (' name="'.$msg.'" height="22" type="image" border="0">'.
      "\n");
    $r->print("Up $tabtag</tr></form>\n");
    return OK;
       }
   
   # display domain
     if ($filecom[1] eq "domain") {      if ($filecom[1] eq "domain") {
    $r->print ('<input type="hidden" name="dirPointer" value="on">'."\n")
       if ($ENV{'form.dirPointer'} eq "on");
  $r->print("<tr>$extrafield");   $r->print("<tr>$extrafield");
  $r->print("<td bgcolor=$fileclr valign=bottom>");   $r->print("<td bgcolor=$fileclr valign=bottom>");
  &begin_form ($r,$filecom[0].'/');   &begin_form ($r,$filecom[0].'/');
  my $anchor = $filecom[0].'/';   my $anchor = $filecom[0].'/';
  $anchor =~ s/\///g;   $anchor =~ s/\///g;
  $r->print ("<a name=\"".$anchor."\">\n<input src=\"".$iconpath."server.gif\"");   $r->print ('<a name="'.$anchor.'">');
  $r->print (" name=\"$msg\" height=\"22\" type=\"image\" border=\"0\">\n");   $r->print ('<input type="hidden" name="acts" value="">');
    $r->print ('<input src="'.$iconpath.'folder_pointer_'.
      $diropen.'.gif"'); 
    $r->print (' name="'.$msg.'" height="22" type="image" border="0">'.
      "\n");
    $r->print ('<a href="javascript:gothere(\''.$filecom[0].
      '/\')"><img src="'.$iconpath.'server.gif"');
    $r->print (' border="0" /></a>'."\n");
  $r->print("Domain - $listname $tabtag</tr></form>\n");   $r->print("Domain - $listname $tabtag</tr></form>\n");
  return OK;   return OK;
   
   # display user directory
     }      }
     if ($filecom[1] eq "user") {      if ($filecom[1] eq "user") {
  $r->print("<tr>$extrafield");   $r->print("<tr>$extrafield");
  $r->print("<td bgcolor=$fileclr valign=bottom>\n");   $r->print("<td bgcolor=$fileclr valign=bottom nowrap>\n");
  my $curdir = $startdir.$filecom[0].'/';   my $curdir = $startdir.$filecom[0].'/';
  &begin_form ($r,$curdir);  
  my $anchor = $curdir;   my $anchor = $curdir;
  $anchor =~ s/\///g;   $anchor =~ s/\///g;
 # $r->print ("<a name=\"$anchor\">\n<img src=",$iconpath,"white_space_20_22.gif border=0>\n");   &begin_form ($r,$curdir);
  $r->print ("<a name=\"$anchor\">\n<img src=",$iconpath,"whitespace1.gif border=0>\n");   $r->print ('<a name="'.$anchor.'"><img src="'.$iconpath.
  $r->print ("<input src=\"$iconpath");     'whitespace1.gif" border="0" />'."\n");
  $r->print ("folder_pointer_closed.gif\"") if $diropen == 0;   $r->print ('<input type="hidden" name="acts" value="">');
  $r->print ("folder_pointer_opened.gif\"") if $diropen == 1;   $r->print ('<input src="'.$iconpath.'folder_pointer_'.$diropen.
  $r->print (" name=\"$msg\" height=\"22\" type=\"image\" border=\"0\">\n");     '.gif"'); 
  $r->print ("<img src=",$iconpath,"quill.gif border=0>\n");   $r->print (' name="'.$msg.'" height="22" type="image" border="0">'.
  $r->print ("$listname $tabtag</tr></form>\n");     "\n");
    $r->print ('<a href="javascript:gothere(\''.$curdir.'\')"><img src='.
      $iconpath.'quill.gif border="0" name="'.$msg.
      '" height="22" /></a>');
    $r->print ($listname.$tabtag.'</tr></form>'."\n");
  return OK;   return OK;
     }      }
   
 # display file  # display file
     if ($fnptr == 0 and $filecom[3] ne "") {      if ($fnptr == 0 and $filecom[3] ne "") {
  my @file_ext = split (/\./,$listname);   my @file_ext = split (/\./,$listname);
  my $curfext = $file_ext[scalar(@file_ext)-1];   my $curfext = $file_ext[-1];
    # Set the icon for the file
    my $iconname = "unknown.gif";
    my $embstyle = &Apache::loncommon::fileembstyle($curfext);
    # The unless conditional that follows is a bit of overkill
    $iconname = $curfext.".gif" unless
       (!defined($embstyle) || $embstyle eq 'unk' || $embstyle eq 'hdn');
    #
  my $filelink = $startdir.$filecom[0];   my $filelink = $startdir.$filecom[0];
  $r->print("<tr><td nowrap valign='bottom' bgcolor=$fileclr>");   $r->print("<tr><td nowrap valign='bottom' bgcolor=$fileclr>");
  my $metafile = grep /^$filecom[0]\.meta\&/, @list;   my $metafile = grep /^$filecom[0]\.meta\&/, @list;
Line 437  sub display_line{ Line 606  sub display_line{
     $title=$listname unless $title;      $title=$listname unless $title;
     $r->print("<a href='javascript:select_data(\"",      $r->print("<a href='javascript:select_data(\"",
               $title,'","',$filelink,"\")'>");                $title,'","',$filelink,"\")'>");
     $r->print("<img src='",$iconpath,"select.gif' border=0></a>\n");      $r->print("<img src='",$iconpath,"select.gif' border='0' /></a>".
         "\n");
     $r->print("</td><td valign='bottom' nowrap bgcolor=$fileclr>");      $r->print("</td><td valign='bottom' nowrap bgcolor=$fileclr>");
  }   }
         elsif ($ENV{'form.catalogmode'} eq 'groupimport') {          elsif ($ENV{'form.catalogmode'} eq 'groupimport') {
Line 447  sub display_line{ Line 617  sub display_line{
     $title=$listname unless $title;      $title=$listname unless $title;
     $r->print("<form name='form$fnum'>\n");      $r->print("<form name='form$fnum'>\n");
     $r->print("<input type='checkbox' name='filelink"."' ".      $r->print("<input type='checkbox' name='filelink"."' ".
       "value='$filelink'>\n");        "value='$filelink' onClick='".
         "javascript:queue(\"form$fnum\")' ");
       if ($hash{'store_'.$filelink}) {
    $r->print("checked");
       }
       $r->print(">\n");
     $r->print("<input type='hidden' name='title"."' ".      $r->print("<input type='hidden' name='title"."' ".
       "value='$title'>\n");        "value='$title'>\n");
     $r->print("</form>\n");      $r->print("</form>\n");
     $r->print("</td><td valign='bottom' nowrap bgcolor=$fileclr>");      $r->print("</td><td valign='bottom' nowrap bgcolor=$fileclr>");
       $hash{"pre_${fnum}_link"}=$filelink;
       $hash{"pre_${fnum}_title"}=$title;
      $fnum++;       $fnum++;
  }   }
   
  if ($indent < 11) {   if ($indent > 0 and $indent < 11) {
     $r->print("<img src=",$iconpath,"whitespace",$indent,".gif border=0>\n");      $r->print("<img src=",$iconpath,"whitespace",$indent,
  } else {        ".gif border='0' />\n");
    } elsif ($indent >0) {
     my $ten = int($indent/10.);      my $ten = int($indent/10.);
     my $rem = $indent%10.0;      my $rem = $indent%10.0;
     my $count = 0;      my $count = 0;
     while ($count < $ten) {      while ($count < $ten) {
  $r->print("<img src=",$iconpath,"whitespace10.gif border=0>\n");   $r->print("<img src=",$iconpath,
     "whitespace10.gif border='0' />\n");
     $count++;      $count++;
     }      }
     $r->print("<img src=",$iconpath,"whitespace",$rem,".gif border=0>\n") if $rem > 0;      $r->print("<img src=",$iconpath,"whitespace",$rem,
         ".gif border='0' />\n") if $rem > 0;
  }   }
   
  $r->print("<img src=$iconpath$curfext.gif border=0>\n");   $r->print("<img src=$iconpath$iconname border='0' />\n");
  $r->print(" <a href=$filelink target='_blank'>",$listname,"</a>\n");   $r->print (" <a href=\"javascript:openWindow('".$filelink.
      "', 'metadatafile', '450', '500', 'no', 'yes')\";".
  $r->print (" (<a href=\"javascript:openWindow('".$filelink.".meta', 'metadatafile', '400', '450', 'no', 'yes')\"; TARGET=_self>metadata</a>) ") if ($metafile == 1);     " TARGET=_self>$listname</a> ");
   
    $r->print (" (<a href=\"javascript:openWindow('".$filelink.
      ".meta', 'metadatafile', '400', '450', 'no', 'yes')\"; ".
      "TARGET=_self>metadata</a>) ") if ($metafile == 1);
   
  $r->print("</td>\n");   $r->print("</td>\n");
 # $r->print("<td bgcolor=$fileclr align=right valign=bottom> ",$filecom[8]," </td>\n") if $ENV{'form.attr0'} == 1;   $r->print("<td bgcolor=$fileclr align=right valign=bottom> ",
  $r->print("<td bgcolor=$fileclr align=right valign=bottom> ",$filecom[8]," </td>\n") if $hash{'display_attrs_0'} == 1;    $filecom[8]," </td>\n") 
  $r->print("<td bgcolor=$fileclr valign=bottom> ".(localtime($filecom[9]))." </td>\n") if $hash{'display_attrs_1'} == 1;      if $hash{'display_attrs_0'} == 1;
  $r->print("<td bgcolor=$fileclr valign=bottom> ".(localtime($filecom[10]))." </td>\n") if $hash{'display_attrs_2'} == 1;   $r->print("<td bgcolor=$fileclr valign=bottom> ".
     (localtime($filecom[9]))." </td>\n") 
       if $hash{'display_attrs_1'} == 1;
    $r->print("<td bgcolor=$fileclr valign=bottom> ".
     (localtime($filecom[10]))." </td>\n") 
       if $hash{'display_attrs_2'} == 1;
   
  if ($hash{'display_attrs_3'} == 1) {   if ($hash{'display_attrs_3'} == 1) {
     my $author = &Apache::lonnet::metadata($filelink,'author') if ($metafile == 1);      my $author = &Apache::lonnet::metadata($filelink,'author')
    if ($metafile == 1);
     $author = '&nbsp;' if (!$author);      $author = '&nbsp;' if (!$author);
     $r->print("<td bgcolor=$fileclr valign=bottom> ".$author." </td>\n");      $r->print("<td bgcolor=$fileclr valign=bottom> ".$author.
         " </td>\n");
  }   }
  if ($hash{'display_attrs_4'} == 1) {   if ($hash{'display_attrs_4'} == 1) {
     my $keywords = &Apache::lonnet::metadata($filelink,'keywords') if ($metafile == 1);      my $keywords = &Apache::lonnet::metadata($filelink,'keywords')
    if ($metafile == 1);
     $keywords = '&nbsp;' if (!$keywords);      $keywords = '&nbsp;' if (!$keywords);
     $r->print("<td bgcolor=$fileclr valign=bottom> ".$keywords." </td>\n");      $r->print("<td bgcolor=$fileclr valign=bottom> ".$keywords.
         " </td>\n");
  }   }
  if ($hash{'display_attrs_5'} == 1) {   if ($hash{'display_attrs_5'} == 1) {
     my $lang = &Apache::lonnet::metadata($filelink,'language') if ($metafile == 1);      my $lang = &Apache::lonnet::metadata($filelink,'language')
     $lang = $language{$lang};   if ($metafile == 1);
       $lang = &Apache::loncommon::languagedescription($lang);
     $lang = '&nbsp;' if (!$lang);      $lang = '&nbsp;' if (!$lang);
     $r->print("<td bgcolor=$fileclr valign=bottom> ".$lang." </td>\n");      $r->print("<td bgcolor=$fileclr valign=bottom> ".$lang.
         " </td>\n");
  }   }
  $r->print("</tr>\n");   $r->print("</tr>\n");
     }      }
   
 # -- display directory  # -- display directory
     if ($fnptr == $dirptr) {      if ($fnptr == $dirptr) {
  my @file_ext = split (/\./,$listname);   my @file_ext = split (/\./,$listname);
Line 507  sub display_line{ Line 703  sub display_line{
  $r->print("<tr>$extrafield<td bgcolor=$fileclr valign=bottom>");   $r->print("<tr>$extrafield<td bgcolor=$fileclr valign=bottom>");
  &begin_form ($r,$curdir);   &begin_form ($r,$curdir);
  my $indentm1 = $indent-1;   my $indentm1 = $indent-1;
  if ($indentm1 < 11) {   if ($indentm1 < 11 and $indentm1 > 0) {
     $r->print("<img src=",$iconpath,"whitespace",$indentm1,".gif border=0>\n");      $r->print("<img src=",$iconpath,"whitespace",$indentm1,
         ".gif border='0' />\n");
  } else {   } else {
     my $ten = int($indentm1/10.);      my $ten = int($indentm1/10.);
     my $rem = $indentm1%10.0;      my $rem = $indentm1%10.0;
     my $count = 0;      my $count = 0;
     while ($count < $ten) {      while ($count < $ten) {
  $r->print("<img src=",$iconpath,"whitespace10.gif border=0>\n");   $r->print ("<img src=",$iconpath
     $count++;     ,"whitespace10.gif border='0' />\n");
    $count++;
     }      }
     $r->print("<img src=",$iconpath,"whitespace",$rem,".gif border=0>\n") if $rem > 0;      $r->print ("<img src=",$iconpath,"whitespace",$rem,
          ".gif border='0' />\n") if $rem > 0;
  }   }
  $r->print ("<a name=\"$anchor\">\n<input src=\"$iconpath");   $r->print ('<input type="hidden" name="acts" value="">');
  $r->print ("folder_pointer_closed.gif\"") if $diropen == 0;   $r->print ('<a name="'.$anchor.'"><input src="'.$iconpath.
  $r->print ("folder_pointer_opened.gif\"") if $diropen == 1;     'folder_pointer_'.$diropen.'.gif"');
  $r->print (" name=\"$msg\" height=\"22\" type=\"image\" border=\"0\">\n");   $r->print (' name="'.$msg.'" height="22" type="image" border="0">'.
  $r->print("<img src=",$iconpath,"folder_closed.gif border=0>\n") if $diropen == 0;     "\n");
  $r->print("<img src=",$iconpath,"folder_opened.gif border=0>\n") if $diropen == 1;   $r->print ('<a href="javascript:gothere(\''.$curdir.'\')"><img src="'.
  $r->print("$listname $tabtag</tr></form>\n");     $iconpath.'folder_'.$diropen.'.gif" border="0" /></a>'.
      "\n");
    $r->print ("$listname$tabtag</tr></form>\n");
     }      }
   
 }  }
   
 #---------------------prints the beginning of a form for directory or file link  # ------------------- prints the beginning of a form for directory or file link
 sub begin_form {  sub begin_form {
     my ($r,$uri) = @_;      my ($r,$uri) = @_;
     my $anchor = $uri;      my $anchor = $uri;
     $anchor =~ s/\///g;      $anchor =~ s/\///g;
     $r->print ("<form method=\"post\" name=\"dirpath\" action=\"/res/\#$anchor\" enctype=\"application/x-www-form-urlencoded\">\n");      $r->print ('<form method="post" name="dirpath'.$dnum.'" action="'.$uri.
     $r->print ("$hidden<input type=hidden name=openuri value=\"$uri\">\n");         '#'.$anchor.
          '" onSubmit="return rep_dirpath(\''.$dnum.'\''.
          ',document.forms.fileattr.acts.value)" '.
          'enctype="application/x-www-form-urlencoded">'."\n");
       $r->print ('<input type="hidden" name="openuri" value="'.$uri.'">'.
          "\n");
       $r->print ('<input type="hidden" name="dirPointer" value="on">'."\n");
       $dnum++;
   }
   
 #    for (my $i=0; $i<=5; $i++) {  # ----------- grab unprocessed CGI variables that may have been appended to URL
 # $r->print ("<input type=hidden name=attr$i value=\"1\">\n") if $ENV{'form.attr'.$i} == 1;  sub get_unprocessed_cgi {
 #    }      foreach (split(/&/,$ENV{'QUERY_STRING'})) {
          my ($name, $value) = split(/=/,$_);
          $value =~ tr/+/ /;
          $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
          if ($name eq 'catalogmode' or $name eq 'launch' or $name eq 'acts') {
              $ENV{'form.'.$name}=$value;
          }
       }
   }
   
   # --------- settings whenever the user causes the indexer window to be launched
   sub start_fresh_session {
       delete $hash{'mode_catalog'};
       foreach (keys %hash) {
    if ($_ =~ /^pre_/) {
       delete $hash{$_};
    }
    if ($_ =~ /^store/) {
       delete $hash{$_};
    }
       }
 }  }
   
 1;  1;
 __END__  
   =head1 NAME
   
   Apache::lonindexer - mod_perl module for cross server filesystem browsing
   
   =head1 SYNOPSIS
   
   Invoked by /etc/httpd/conf/srm.conf:
   
    <LocationMatch "^/res.*/$">
    SetHandler perl-script
    PerlHandler Apache::lonindexer
    </LocationMatch>
   
   =head1 INTRODUCTION
   
   This module enables a scheme of browsing across a cross server.
   
   This is part of the LearningOnline Network with CAPA project
   described at http://www.lon-capa.org.
   
   =head1 BEGIN SUBROUTINE
   
   This routine is only run once after compilation.
   
   =over 4
   
   =item *
   
   Initializes %language hash table.
   
   =back
   
   =head1 HANDLER SUBROUTINE
   
   This routine is called by Apache and mod_perl.
   
   =over 4
   
   =item *
   
   read in machine configuration variables
   
   =item *
   
   see if called from an interactive mode
   
   =item *
   
   refresh environment with user database values (in %hash)
   
   =item *
   
   define extra fields and buttons in case of special mode
   
   =item *
   
   set catalogmodefunctions to have extra needed javascript functionality
   
   =item *
   
   print header
   
   =item *
   
   evaluate actions from previous page (both cumulatively and chronologically)
   
   =item *
   
   output title
   
   =item *
   
   get state of file attributes to be showing
   
   =item *
   
   output state of file attributes to be showing
   
   =item *
   
   output starting row to the indexed file/directory hierarchy
   
   =item *
   
   read in what directories have previously been set to "open"
   
   =item *
   
   if not at top level, provide an uplink arrow
   
   =item *
   
   recursively go through all the directories and output as appropriate
   
   =item *
   
   information useful for group import
   
   =item *
   
   end the tables
   
   =item *
   
   end the output and return
   
   =back
   
   =head1 OTHER SUBROUTINES
   
   =over 4
   
   =item *
   
   scanDir - recursive scan of a directory
   
   =item *
   
   get_list - get complete matched list based on the uri (returns an array)
   
   =item *
   
   match_ext - filters out files based on extensions (returns an array)
   
   =item *
   
   display_line - displays one line in appropriate table format
   
   =item *
   
   begin_form - prints the beginning of a form for directory or file link
   
   =item *
   
   get_unprocessed_cgi - grab unprocessed CGI variables that may have been
   appended to URL
   
   =item *
   
   start_fresh_session - settings whenever the user causes the indexer window
   to be launched
   
   =back
   
   =cut
Removed from v.1.10  
changed lines
  Added in v.1.30

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