--- loncom/publisher/londiff.pm	2007/01/15 18:34:32	1.23
+++ loncom/publisher/londiff.pm	2013/06/04 22:20:16	1.37
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Handler to show differences between file versions
 #
-# $Id: londiff.pm,v 1.23 2007/01/15 18:34:32 albertel Exp $
+# $Id: londiff.pm,v 1.37 2013/06/04 22:20:16 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -27,6 +27,9 @@
 #
 ###
 
+
+
+
 package Apache::londiff;
 
 use strict;
@@ -35,7 +38,6 @@ use File::Copy;
 use File::Compare;
 use Algorithm::Diff qw(diff);
 use Apache::Constants qw(:common :http :methods);
-use Apache::loncacc();
 use Apache::lonnet;
 use Apache::loncommon();
 use Apache::lonretrieve();
@@ -74,29 +76,56 @@ sub handler {
     &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
 					    ['filename','versiontwo',
 					     'versionone','filetwo']);
-# Get the files
 
+# Check permissions
+    my $allowed=0;
     my $cuname=$env{'user.name'};
     my $cudom=$env{'user.domain'};
 
-    if ($env{'form.filename'}=~/^\/res\//) {
-	($cudom,$cuname,$env{'form.filename'})=
-	    ($env{'form.filename'}=~m{^/res/($LONCAPA::domain_re)/($LONCAPA::username_re)/(.*)$});
+    if ($env{'form.filename'}=~ m{^/res/}) {
+        if (&Apache::lonnet::allowed('bre',$env{'form.filename'})) {
+            if ($env{'request.course.id'}) {
+                if (&Apache::lonnet::allowed('mdc',$env{'request.course.id'})) {
+                    $allowed = 1;
+                }
+            } else {
+                $allowed = 1;
+            }
+        } elsif (&Apache::lonnet::allowed('bro',$env{'form.filename'})) {
+            $allowed = 1;
+        }
+        if ($allowed) {
+            ($cudom,$cuname,$env{'form.filename'})=
+                ($env{'form.filename'}=~m{^/res/($LONCAPA::domain_re)/($LONCAPA::username_re)(/.*)$});
+
+            if (($env{'form.versionone'} eq 'priv') || ($env{'form.versiontwo'} eq 'priv')) {
+                my ($cstrname,$cstrdom) =
+                    &Apache::lonnet::constructaccess("/priv/$cudom/$cuname".$env{'form.filename'});
+                unless (($cstrname eq $cuname) && ($cstrdom eq $cudom)) {
+                    $allowed = 0;
+                }
+            }
+        }
     } else {
-	unless (($cuname,$cudom)=
-		&Apache::loncacc::constructaccess($env{'form.filename'},
-						  $r->dir_config('lonDefDomain'))) {
-	    $r->log_reason($cuname.':'.$cudom.
+	($cuname,$cudom)=
+	    &Apache::lonnet::constructaccess($env{'form.filename'});
+        if ($cuname ne '' && $cudom ne '') {
+            $allowed = 1;
+        } else {
+	    $r->log_reason($env{'user.name'}.':'.$env{'user.domain'}.
 			   ' trying to get diffs file '.$env{'form.filename'}.
-			   '  - not authorized', 
-			   $r->filename); 
-	    return HTTP_NOT_ACCEPTABLE;
+			   '  - not authorized',
+			   $r->filename);
 	}
     }
-  
-    my $efn=$env{'form.filename'};
+    unless ($allowed) {
+        return HTTP_NOT_ACCEPTABLE;
+    }
 
-    $efn=~s{/\~($LONCAPA::username_re)}{}g;
+# Get the files
+
+    my $efn=$env{'form.filename'};
+    $efn=~s{^/priv/$LONCAPA::domain_re/$LONCAPA::username_re}{};
 
     my @f1=();
     my @f2=();
@@ -104,28 +133,35 @@ sub handler {
     &Apache::loncommon::content_type($r,'text/html');
     $r->send_http_header;
 
-    $r->print(&Apache::loncommon::start_page('Resource Differences'));
-
+    $r->print(&Apache::loncommon::start_page('Resource Differences',undef,
+                                             {'no_nav_bar'  => 1, }));
   
-    $r->print('<h1>'.($env{'form.filetwo'}?'':&mt('Compare versions of')).
-	      ' <tt>'.$efn.'</tt></h1>');
+    $r->print(($env{'form.filetwo'}?'':&mt('Compare versions of')).
+	      ' <span class="LC_filename">'.$efn.'</span>');
    
     if (($cuname ne $env{'user.name'}) || ($cudom ne $env{'user.domain'})) {
-	$r->print('<h3><span class="LC_diff_coauthor">Co-Author: '.$cuname.' at '.$cudom.
-		  '</span></h3>');
+        my $nameshown = &Apache::loncommon::plainname($cuname,$cudom).
+                        ' ('.$cuname.':'.$cudom.')';
+        $r->print('<p><span class="LC_info">');
+        if ($env{'request.role'} =~ /^ca\./) {
+            $r->print(&mt('Co-Author in Authoring Space for: [_1]',$nameshown));
+        } elsif ($env{'request.role'} =~ /^aa\./) {
+            $r->print(&mt('Assistant Author in Authoring Space for: [_1]',$nameshown));
+        } else {
+            $r->print(&mt('Resource Author is: [_1]',$nameshown));
+        }
+        $r->print('</span></p>');
     }
 
-
     if (&Apache::loncommon::fileembstyle(($efn=~/\.(\w+)$/)) eq 'ssi'
 	|| $efn =~ /\.meta$/) {
 	$r->print('<p><span class="LC_diff_removed">');
 	if ($env{'form.versionone'} eq 'priv') {
-	    my $fn='/home/'.$cuname.'/public_html/'.$efn;
+	    my $fn=$r->dir_config('lonDocRoot')."/priv/$cudom/$cuname".$efn;
 	    @f1=&get_split_file($fn,'local');
-	    $r->print('<b>'.&mt('Construction Space Version').'</b>');
+	    $r->print('<b>'.&mt('Authoring Space Version').'</b>');
 	} else {
-	    my $fn=
-		'/home/httpd/html/res/'.$cudom.'/'.$cuname.'/';
+	    my $fn=$r->dir_config('lonDocRoot')."/res/$cudom/$cuname";
 	    if ($env{'form.versionone'}) {
 		my ($main,$suffix,$is_meta)=
 		    &Apache::lonretrieve::get_file_info($efn);
@@ -145,17 +181,16 @@ sub handler {
 
 	if ($env{'form.filetwo'}) {
 	    my $efn2=$env{'form.filetwo'};
-	    $efn2=~s{/\~($LONCAPA::username_re)}{}g;
-	    my $fn='/home/'.$cuname.'/public_html/'.$efn2;
+	    $efn2=~s{^/priv/$LONCAPA::domain_re/$LONCAPA::username_re}{};
+	    my $fn=$r->dir_config('lonDocRoot')."/priv/$cudom/$cuname".$efn2;
 	    @f2=&get_split_file($fn,'local');
 	    $r->print('<tt>'.$efn2.'</tt>');
 	} elsif ($env{'form.versiontwo'} eq 'priv') {
-	    my $fn='/home/'.$cuname.'/public_html/'.$efn;
+	    my $fn=$r->dir_config('lonDocRoot')."/priv/$cudom/$cuname".$efn;
 	    @f2=&get_split_file($fn,'local');
-	    $r->print('<b>'.&mt('Construction Space Version').'</b>');
+	    $r->print('<b>'.&mt('Authoring Space Version').'</b>');
 	} else {
-	    my $fn=
-		'/home/httpd/html/res/'.$cudom.'/'.$cuname.'/';
+	    my $fn=$r->dir_config('lonDocRoot')."/res/$cudom/$cuname/";
 	    if ($env{'form.versiontwo'}) {
 		my ($main,$suffix,$is_meta)=
 		    &Apache::lonretrieve::get_file_info($efn);
@@ -173,32 +208,30 @@ sub handler {
 # Run diff
 
 	my $diffs = diff(\@f1, \@f2);
-	
-# Start page output
-
-	my $chunk;
-	my $line;
 
-	$r->print('<pre>');
-	
-	foreach $chunk (@$diffs) {
-	 
-	    foreach $line (@$chunk) {
-		my ($sign, $lineno, $text) = @$line;
-		$text=&HTML::Entities::encode($text,'<>&"');
-		$lineno=substr($lineno.'        ',0,7);
-		$r->print('<span class="'.(($sign eq '+')?'LC_diff_added'
-                                                         :'LC_diff_removed').'">'.
-			  $sign.' '.$lineno.' '.$text."</span>\n");
-	    }
-	    $r->print("</pre><hr /><pre>\n");
-	}
-	$r->print('</pre>');
-	
+        if (@$diffs) {
+            # Start page output
+            my $chunk;
+            my $line;
+            $r->print('<pre>');
+            foreach $chunk (@$diffs) {
+                foreach $line (@$chunk) {
+                    my ($sign, $lineno, $text) = @$line;
+                    $text=&HTML::Entities::encode($text,'<>&"');
+                    $lineno=substr($lineno.'        ',0,7);
+                    $r->print('<span class="'.(($sign eq '+')?'LC_diff_added'
+                                                             :'LC_diff_removed').'">'.
+                              $sign.' '.$lineno.' '.$text."</span>\n");
+                }
+                $r->print("</pre><hr /><pre>\n");
+            }
+            $r->print('</pre>');
+        } else {
+            $r->print('<p class="LC_info">'.&mt('No differences found').'</p>');
+        }
     } else {
 	$r->print('<h1><span class="LC_warning">'.&mt('Binary File').'</span></h1>');
     }
-    $r->print('<center><a href="javascript:window.close();">'.&mt('Close This Window').'</a></center>');
     $r->print(&Apache::loncommon::end_page()); 
     return OK;  
 }
@@ -208,5 +241,27 @@ sub handler {
 __END__
 
 
+=pod
+
+=head1 NAME
+
+Apache::londiff
+
+=head1 SYNOPSIS
+
+Handler to show difference between two files.
+
+This is part of the LearningOnline Network with CAPA project
+described at http://www.lon-capa.org.
+
+=head1 Subroutines
+
+=over
+
+=item get_split_file()
+
+=item are_different_files()
 
+=item handler()
 
+=cut