--- loncom/publisher/lonretrieve.pm	2001/04/03 18:12:57	1.2
+++ loncom/publisher/lonretrieve.pm	2011/10/23 01:27:34	1.43
@@ -1,17 +1,97 @@
 # The LearningOnline Network with CAPA
 # Handler to retrieve an old version of a file
 #
-# (Publication Handler
-# 
-# (TeX Content Handler
+# $Id: lonretrieve.pm,v 1.43 2011/10/23 01:27:34 www Exp $
 #
-# 05/29/00,05/30,10/11 Gerd Kortemeyer)
+# Copyright Michigan State University Board of Trustees
 #
-# 11/28,11/29,11/30,12/01,12/02,12/04,12/23 Gerd Kortemeyer
-# 03/23 Guy Albertelli
-# 03/24,03/29 Gerd Kortemeyer)
+# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
 #
-# 03/31 Gerd Kortemeyer
+# 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/
+#
+#
+###
+
+=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
 
 package Apache::lonretrieve;
 
@@ -19,70 +99,283 @@ use strict;
 use Apache::File;
 use File::Copy;
 use Apache::Constants qw(:common :http :methods);
+use Apache::loncacc;
+use Apache::loncommon();
+use Apache::lonlocal;
+use Apache::lonnet;
+use LONCAPA();
 
+# ------------------------------------ Interface for selecting previous version
 sub phaseone {
     my ($r,$fn,$uname,$udom)=@_;
     my $docroot=$r->dir_config('lonDocRoot');
 
-    my $resdir=$docroot.'/res/'.$udom.'/'.$uname.$fn;
+    my $urldir='/res/'.$udom.'/'.$uname.$fn;
+    $urldir=~s/\/[^\/]+$/\//;
+
+    my $resfn=$docroot.'/res/'.$udom.'/'.$uname.$fn;
+    my $resdir=$resfn;
     $resdir=~s/\/[^\/]+$/\//;
 
-    $fn=~/^\/(.+)\.(\w+)$/;
-    my $main=$1;
-    my $suffix=$2;
+    my ($main,$suffix,$is_meta) = &get_file_info($fn);
     
-    my $filename;
-    opendir(DIR,$resdir);
-    while ($filename=readdir(DIR)) {
-        if ($filename=~/^$main\.(\d+)\.$suffix$/) {
-           $r->print($resdir.' = '.$filename.'<br>');
+    if (-e $resfn) {  
+	$r->print('<form action="/adm/retrieve" method="post">'.
+		  '<input type="hidden" name="filename" value="/~'.$uname.$fn.'" />'.
+		  '<input type="hidden" name="phase" value="two" />'.
+		  &Apache::loncommon::start_data_table().
+		  &Apache::loncommon::start_data_table_header_row().
+		  '<th>'.&mt('Select').'</th>'.
+		  '<th>'.&mt('Version').'</th>'.
+		  '<th>'.&mt('Published on ...').'</th>');
+	if (!$is_meta) {
+	    $r->print('<th>'.&mt('Metadata').'</th>');
+	}
+	if ($is_meta
+	    || &Apache::loncommon::fileembstyle($suffix) eq 'ssi') {
+	    $r->print('<th>'.&mt('Diffs').'</th>');
+	}
+	$r->print(&Apache::loncommon::end_data_table_header_row());
+	
+	opendir(DIR,$resdir);
+	my @files = grep(/^\Q$main\E\.(\d+)\.\Q$suffix\E$/,readdir(DIR));
+	@files = sort {
+	    my ($aver) = ($a=~/^\Q$main\E\.(\d+)\.\Q$suffix\E$/);
+	    my ($bver) = ($b=~/^\Q$main\E\.(\d+)\.\Q$suffix\E$/);
+	    return $aver <=> $bver;
+	} (@files);
+	closedir(DIR);
+	
+	foreach my $filename (@files) {
+	    if ($filename=~/^\Q$main\E\.(\d+)\.\Q$suffix\E$/) {
+		my $version=$1;
+		my $rmtime=&Apache::lonnet::metadata($resdir.'/'.$filename,'lastrevisiondate');
+		$r->print(&Apache::loncommon::start_data_table_row().
+			  '<td><input type="radio" name="version" value="'.
+			  $version.'" /></td><td>'.&mt('Previously published version').' '.$version.'</td>'.
+              '<td>'.&Apache::lonlocal::locallocaltime($rmtime).'</td>');
+		
+		if (!$is_meta) {
+		    $r->print('<td><a href="'.$urldir.$filename.'.meta" target="cat">'.
+			      &mt('Metadata Version').' '.$version.'</a></td>');
+		}
+		if ($is_meta
+		    || &Apache::loncommon::fileembstyle($suffix) eq 'ssi') {
+		    $r->print(
+			      '<td><a target="cat" href="/adm/diff?filename=/~'.
+			      $uname.$fn.
+			      '&amp;versiontwo=priv&amp;versionone='.$version.
+			      '">'.&mt('Diffs with Version').' '.$version.
+			      '</a></td>');
+		}
+		$r->print(&Apache::loncommon::end_data_table_row());
+	    }
+	}
+	closedir(DIR);
+	my $rmtime=&Apache::lonnet::metadata($resfn,'lastrevisiondate');
+	$r->print(&Apache::loncommon::start_data_table_row().
+		  '<td><input type="radio" name="version" value="new" /></td>'.
+		  '<td><b>'.&mt('Currently published version').'</b></td>'.
+          '<td>'.&Apache::lonlocal::locallocaltime($rmtime).'</td>'
+    );
+	if (!$is_meta) {
+	    $r->print('<td><a href="'.$urldir.$main.'.'.$suffix.'.meta" target="cat">'.
+		      &mt('Metadata current version').'</a></td>');           
+	}
+	if ($is_meta 
+	    || &Apache::loncommon::fileembstyle($suffix) eq 'ssi') {
+	    $r->print(
+		      '<td><a target="cat" href="/adm/diff?filename=/~'.
+		      $uname.$fn.
+		      '&amp;versiontwo=priv'.
+		      '">'.&mt('Diffs with current Version').'</a></td>');
+	}
+	$r->print(&Apache::loncommon::end_data_table_row().
+		  &Apache::loncommon::end_data_table().
+		  '<p>'.'<span class="LC_warning">'.
+		  &mt('Retrieval of an old version will overwrite the file currently in construction space.').'</span></p>');
+	if (!$is_meta) {
+	    $r->print('<p>'.'<span class="LC_warning">'.
+		      &mt('This will only retrieve the resource. If you want to retrieve the metadata, you will need to do that separately.').
+		      '</span></p>');
+	}
+	$r->print('<input type="submit" value="'.&mt('Retrieve selected Version').'" /></form>');
+    } else {
+	$r->print('<p class="LC_warning">'.&mt('No previous versions published.').'</p>');
+    }
+
+    my $dir =  &Apache::loncommon::authorspace()
+              .&File::Basename::dirname($fn)
+              .'/';
+    $r->print(&Apache::lonhtmlcommon::start_funclist()
+             .&Apache::lonhtmlcommon::add_item_funclist(
+                  '<a href="/priv/'.$uname.$fn.'">'
+                 .&mt('Back to Resource')
+                 .'</a>')
+             .&Apache::lonhtmlcommon::add_item_funclist(
+                  '<a href="'.$dir.'">'
+                 .&mt('Back to Directory')
+                 .'</a>')
+             .&Apache::lonhtmlcommon::end_funclist()
+    );
+}
+
+# ---------------------------------- Interface for presenting specified version
+sub phasetwo {
+    my ($r,$fn,$uname,$udom)=@_;
+    if ($env{'form.version'}) {
+        my $version=$env{'form.version'};
+	if ($version eq 'new') {
+	    $r->print('<h3>'.&mt('Retrieving current (most recent) version').'</h3>');
+        } else {
+            $r->print('<h3>'.&mt('Retrieving old version').' '.$version.'</h3>');
+        }
+	my ($main,$suffix,$is_meta) = &get_file_info($fn);
+
+        my $logfile;
+        my $ctarget=$r->dir_config('lonDocRoot').'/priv/'.$udom.'/'.$uname.$fn;
+        my $vfn=$fn;
+        if ($version ne 'new') {
+	    $vfn=~s/\.(\Q$suffix\E)$/\.$version\.$1/;
+        }
+
+        my $csource=$r->dir_config('lonDocRoot').'/res/'.$udom.'/'.$uname.$vfn;
+
+	my $logname = $ctarget;
+	if ($is_meta) { $logname =~ s/\.meta$//; }
+	$logname = $ctarget.'.log';
+        unless ($logfile=Apache::File->new('>>'.$logname)) {
+          $r->print('<span class="LC_error">'
+                   .&mt('No write permission to user directory, FAIL')
+                   .'</span>');
+        }
+        print $logfile 
+"\n\n================= Retrieve ".localtime()." ================\n".
+"Version: $version\nSource: $csource\nTarget: $ctarget\n";
+        $r->print('<p>'.&mt('Copying file').': ');
+	if (copy($csource,$ctarget)) {
+	    $r->print('<span class="LC_success">'
+                     .&mt('ok')
+                     .'</span>');
+            print $logfile "Copied sucessfully.\n\n";
+        } else {
+            my $error=$!;
+	    $r->print('<span class="LC_error">'
+                     .&mt('Copy failed: [_1]',$error)
+                     .'</span>');
+            print $logfile "Copy failed: $error\n\n";
         }
+        $r->print('</p>'
+                 .'<p><a href="/priv/'.$uname.$fn.'">'
+                 .&mt('Back to Resource')
+                 .'</a></p>');
+    } else {
+       $r->print('<p class="LC_info">'.&mt('Please pick a version to retrieve:').'</p>');
+       &phaseone($r,$fn,$uname,$udom);
     }
-    closedir(DIR);
 }
 
+sub get_file_info {
+    my ($fn) = @_;
+    my ($main,$suffix) = ($fn=~/\/([^\/]+)\.(\w+)$/);
+    my $is_meta=0;
+    if ($suffix eq 'meta') {
+	$is_meta = 1;
+	($main,$suffix) = ($main=~/(.+)\.(\w+)$/);	    
+	$suffix .= '.meta';
+    }
+    return ($main,$suffix,$is_meta);
+}
+
+# ---------------------------------------------------------------- Main Handler
 sub handler {
 
   my $r=shift;
 
   my $fn;
 
-  if ($ENV{'form.filename'}) {
-      $fn=$ENV{'form.filename'};
-      $fn=~s/^http\:\/\/[^\/]+\/\~(\w+)//;
+
+# Get query string for limited number of parameters
+
+  &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
+					  ['filename']);
+
+  if ($env{'form.filename'}) {
+      $fn=$env{'form.filename'};
+      $fn=~s/^https?\:\/\/[^\/]+//;
   } else {
-     $r->log_reason($ENV{'user.name'}.' at '.$ENV{'user.domain'}.
+     $r->log_reason($env{'user.name'}.' at '.$env{'user.domain'}.
          ' unspecified filename for retrieval', $r->filename); 
      return HTTP_NOT_FOUND;
   }
 
   unless ($fn) { 
-     $r->log_reason($ENV{'user.name'}.' at '.$ENV{'user.domain'}.
+     $r->log_reason($env{'user.name'}.' at '.$env{'user.domain'}.
          ' trying to retrieve non-existing file', $r->filename); 
      return HTTP_NOT_FOUND;
   } 
 
 # ----------------------------------------------------------- Start page output
+  my $uname;
+  my $udom;
 
-  my $uname=$ENV{'user.name'};
-  my $udom=$ENV{'user.domain'};
-
-  $r->content_type('text/html');
-  $r->send_http_header;
+  ($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', 
+         $r->filename); 
+     return HTTP_NOT_ACCEPTABLE;
+  }
 
-  $r->print('<html><head><title>LON-CAPA Construction Space</title></head>');
+  $fn=~s{/~($LONCAPA::username_re)}{};
 
-  $r->print(
-   '<body bgcolor="#FFFFFF"><img align=right src=/adm/lonIcons/lonlogos.gif>');
+  &Apache::loncommon::content_type($r,'text/html');
+  $r->send_http_header;
 
+    # Breadcrumbs
+    &Apache::lonhtmlcommon::clear_breadcrumbs();
+    &Apache::lonhtmlcommon::add_breadcrumb({
+        'text'  => 'Construction Space',
+        'href'  => &Apache::loncommon::authorspace(),
+    });
+    &Apache::lonhtmlcommon::add_breadcrumb({
+        'text'  => 'Retrieve previous version',
+        'href'  => '',
+    });
+
+  $r->print(&Apache::loncommon::start_page('Retrieve Published Resources')
+           .&Apache::lonhtmlcommon::breadcrumbs()
+           .&Apache::loncommon::head_subbox(
+                &Apache::loncommon::CSTR_pageheader()) # FIXME crumbs broken?
+    );
+
+  $r->print('<p>'
+           .&mt('Retrieve previous versions of [_1]'
+                   ,'<span class="LC_filename">'.$fn.'</span>')
+           .'</p>');
   
-  $r->print('<h1>Retrieve previous versions of <tt>'.$fn.'</tt></h1>');
+  if (($uname ne $env{'user.name'}) || ($udom ne $env{'user.domain'})) {
+          $r->print('<p><span class="LC_info">'
+                   .&mt('Co-Author [_1]'
+                       ,&Apache::loncommon::plainname($uname,$udom)
+                       .' ('.$uname.':'.$udom.')')
+                   .'</span></p>');
+  }
+
 
-  if ($ENV{'form.phase'} eq 'two') {
+  if ($env{'form.phase'} eq 'two') {
+      &phasetwo($r,$fn,$uname,$udom);
   } else {
       &phaseone($r,$fn,$uname,$udom);
   }
 
-  $r->print('</body></html>');
+  $r->print(&Apache::loncommon::end_page());
   return OK;  
 }
+
+1;
+__END__
+
+