--- loncom/publisher/lonretrieve.pm	2001/05/24 21:43:05	1.12
+++ loncom/publisher/lonretrieve.pm	2002/05/30 14:08:42	1.18
@@ -1,17 +1,47 @@
 # The LearningOnline Network with CAPA
 # Handler to retrieve an old version of a file
 #
+# $Id: lonretrieve.pm,v 1.18 2002/05/30 14:08:42 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/
+#
+#
 # (Publication Handler
 # 
 # (TeX Content Handler
 #
+# YEAR=2000
 # 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
+# YEAR=2001
 # 03/23 Guy Albertelli
 # 03/24,03/29 Gerd Kortemeyer)
 #
-# 03/31,04/03,05/02,05/09 Gerd Kortemeyer
+# 03/31,04/03,05/02,05/09,06/23,08/20 Gerd Kortemeyer
+# 12/16 Scott Harrison
+#
+###
 
 package Apache::lonretrieve;
 
@@ -20,7 +50,9 @@ use Apache::File;
 use File::Copy;
 use Apache::Constants qw(:common :http :methods);
 use Apache::loncacc;
+use Apache::loncommon();
 
+# ------------------------------------ Interface for selecting previous version
 sub phaseone {
     my ($r,$fn,$uname,$udom)=@_;
     my $docroot=$r->dir_config('lonDocRoot');
@@ -57,7 +89,7 @@ sub phaseone {
                      localtime($rmtime).'</td><td>'.
                      '<a href="'.$urldir.$filename.'.meta" target=cat>'.
                      'Metadata Version '.$version.'</a>');
-           if (&Apache::lonnet::fileembstyle($suffix) eq 'ssi') {
+           if (&Apache::loncommon::fileembstyle($suffix) eq 'ssi') {
                $r->print(
                     '&nbsp;&nbsp;<a target=cat href="/adm/diff?filename=/~'.
                         $uname.$fn.
@@ -76,7 +108,7 @@ sub phaseone {
               '<th>Current</th><td>'.localtime($rmtime).
            '</td><td><a href="'.$urldir.$main.'.'.$suffix.'.meta" target=cat>'.
               'Metadata current version</a>');           
-           if (&Apache::lonnet::fileembstyle($suffix) eq 'ssi') {
+           if (&Apache::loncommon::fileembstyle($suffix) eq 'ssi') {
                $r->print(
                     '&nbsp;&nbsp;<a target=cat href="/adm/diff?filename=/~'.
                         $uname.$fn.
@@ -92,6 +124,7 @@ sub phaseone {
 }
 }
 
+# ---------------------------------- Interface for presenting specified version
 sub phasetwo {
     my ($r,$fn,$uname,$udom)=@_;
     if ($ENV{'form.version'}) {
@@ -133,12 +166,19 @@ sub phasetwo {
     }
 }
 
+# ---------------------------------------------------------------- Main Handler
 sub handler {
 
   my $r=shift;
 
   my $fn;
 
+
+# Get query string for limited number of parameters
+
+  &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
+					  ['filename']);
+
   if ($ENV{'form.filename'}) {
       $fn=$ENV{'form.filename'};
       $fn=~s/^http\:\/\/[^\/]+//;
@@ -158,9 +198,9 @@ sub handler {
   my $uname;
   my $udom;
 
-  unless (($uname,$udom)=
-    &Apache::loncacc::constructaccess(
-             $fn,$r->dir_config('lonDefDomain'))) {
+  ($uname,$udom)=
+    &Apache::loncacc::constructaccess($fn,$r->dir_config('lonDefDomain'));
+  unless (($uname) && ($udom)) {
      $r->log_reason($uname.' at '.$udom.
          ' trying to publish file '.$ENV{'form.filename'}.
          ' ('.$fn.') - not authorized', 
@@ -199,3 +239,68 @@ sub handler {
 
 1;
 __END__
+
+=head1 NAME
+
+Apache::lonretrieve - retrieves an old version of a file
+
+=head1 SYNOPSIS
+
+Invoked by /etc/httpd/conf/srm.conf:
+
+ <Location /adm/retrieve>
+ PerlAccessHandler       Apache::lonacc
+ SetHandler perl-script
+ PerlHandler Apache::lonretrieve
+ ErrorDocument     403 /adm/login
+ ErrorDocument     404 /adm/notfound.html
+ ErrorDocument     406 /adm/unauthorized.html
+ ErrorDocument	  500 /adm/errorhandler
+ </Location>
+
+=head1 INTRODUCTION
+
+This module retrieves an old published version of a file.
+
+This is part of the LearningOnline Network with CAPA project
+described at http://www.lon-capa.org.
+
+=head1 HANDLER SUBROUTINE
+
+This routine is called by Apache and mod_perl.
+
+=over 4
+
+=item *
+
+Get query string for limited number of parameters
+
+=item *
+
+Start page output
+
+=item *
+
+print phase relevant output
+
+=item *
+
+(phase one is to select version; phase two retrieves version)
+
+=back
+
+=head1 OTHER SUBROUTINES
+
+=over 4
+
+=item *
+
+phaseone() : Interface for selecting previous version.
+
+=item *
+
+phasetwo() : Interface for presenting specified version.
+
+=back
+
+=cut