--- loncom/homework/lonhomework.pm	2003/06/16 21:32:43	1.135
+++ loncom/homework/lonhomework.pm	2003/10/15 22:18:26	1.138.2.1
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # The LON-CAPA Homework handler
 #
-# $Id: lonhomework.pm,v 1.135 2003/06/16 21:32:43 www Exp $
+# $Id: lonhomework.pm,v 1.138.2.1 2003/10/15 22:18:26 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -50,7 +50,7 @@ use Apache::essayresponse();
 use Apache::externalresponse();
 use Apache::rankresponse();
 use Apache::matchresponse();
-#use Apache::chemresponse();
+use Apache::chemresponse();
 use Apache::Constants qw(:common);
 use HTML::Entities();
 use Apache::loncommon();
@@ -72,7 +72,8 @@ sub get_target {
     }
  
     if ( defined($ENV{'form.submitted'}) &&
-	 ( !defined($ENV{'form.resetdata'}))) {
+	 ( !defined($ENV{'form.resetdata'})) &&
+	 ( !defined($ENV{'form.newrandomization'}))) {
       return ('grade', 'web');
     } else {
       return ('web');
@@ -91,7 +92,8 @@ sub get_target {
       if ( $ENV{'form.problemmode'} eq 'View' ||
 	   $ENV{'form.problemmode'} eq 'Discard Edits and View') {
 	if ( defined($ENV{'form.submitted'}) &&
-	     (!defined($ENV{'form.resetdata'})) ) {
+	     (!defined($ENV{'form.resetdata'})) &&
+	     (!defined($ENV{'form.newrandomization'}))) {
 	  return ('grade', 'web','answer');
 	} else {
 	  return ('web','answer');
@@ -144,6 +146,51 @@ sub send_footer {
 
 $Apache::lonxml::browse='';
 
+sub check_ip_acc {
+    my ($acc)=@_;
+    if (!defined($acc) || $acc =~ /^\s*$/) { return 1; }
+    my $allowed=0;
+    my $ip=$ENV{'REMOTE_ADDR'};
+    my $name;
+    foreach my $pattern (split(',',$acc)) {
+	if ($pattern =~ /\*$/) {
+	    #35.8.*
+	    $pattern=~s/\*//;
+	    if ($ip =~ /^\Q$pattern\E/) { $allowed=1; }
+	} elsif ($pattern =~ /(\d+\.\d+\.\d+)\.\[(\d+)-(\d+)\]$/) {    
+	    #35.8.3.[34-56]
+	    my $low=$2;
+	    my $high=$3;
+	    $pattern=$1;
+	    if ($ip =~ /^\Q$pattern\E/) { 
+		my $last=(split(/\./,$ip))[3];
+		if ($last <=$high && $last >=$low) { $allowed=1; }
+	    }
+	} elsif ($pattern =~ /^\*/) {
+	    #*.msu.edu
+	    $pattern=~s/\*//;
+	    if (!defined($name)) {
+		use Socket;
+		my $netaddr=inet_aton($ip);
+		($name)=gethostbyaddr($netaddr,AF_INET);
+		}
+	    if ($name =~ /\Q$pattern\E$/i) { $allowed=1; }
+	} elsif ($pattern =~ /\d+\.\d+\.\d+\.\d+/) {
+	    #127.0.0.1
+	    if ($ip =~ /^\Q$pattern\E/) { $allowed=1; }
+	} else {
+	    #some.name.com
+	    if (!defined($name)) {
+		use Socket;
+		my $netaddr=inet_aton($ip);
+		($name)=gethostbyaddr($netaddr,AF_INET);
+	    }
+	    if ($name =~ /\Q$pattern\E$/i) { $allowed=1; }
+	}
+	if ($allowed) { last; }
+    }
+    return $allowed;
+}
 # JB, 9/24/2002: Any changes in this function may require a change
 # in lonnavmaps::resource::getDateStatus.
 sub check_access {
@@ -165,6 +212,14 @@ sub check_access {
 
   &Apache::lonxml::debug("checking for part :$id:");
   &Apache::lonxml::debug("time:".time);
+    
+    my $allowed=&check_ip_acc(&Apache::lonnet::EXT("resource.$id.acc"));
+    if (!$allowed) {
+	$status='INVALID_ACCESS';
+	$date=&mt("can not be accessed from your location.");
+	return($status,$date);
+    }
+
   foreach $temp ("opendate","duedate","answerdate") {
     $lastdate = $date;
     $date = &Apache::lonnet::EXT("resource.$id.$temp");
@@ -469,15 +524,8 @@ sub editxmlmode {
     &renderpage($request,$file);
   } else {
     my ($rows,$cols) = &Apache::edit::textarea_sizes(\$problem);
-    my $xml_help = '<table><tr><td>'.
-	&Apache::loncommon::help_open_topic("Problem_Editor_XML_Index",'Problem Editing Help')
-	    .'</td><td>'.
-	&Apache::loncommon::help_open_topic("Greek_Symbols",'Greek Symbols',
-					    undef,undef,600)
-	    .'</td><td>'.
-        &Apache::loncommon::help_open_topic("Other_Symbols",'Other Symbols',
-					    undef,undef,600)
-	    .'</td></tr></table>';
+    my $xml_help = Apache::loncommon::helpLatexCheatsheet("Problem_Editor_XML_Index",
+							  "Problem Editing Help");
     if ($cols > 80) { $cols = 80; }
     if ($cols < 70) { $cols = 70; }
     if ($rows < 20) { $rows = 20; }
@@ -670,9 +718,11 @@ sub handler {
   &Apache::lonxml::debug('symb is '.$symb);
   if ($ENV{'request.state'} eq "construct" || $symb eq '') {
       if ($ENV{'form.resetdata'} eq 'Reset Submissions' ||
-	  $ENV{'form.resetdata'} eq 'New Problem Variation' ) {
+	  $ENV{'form.resetdata'} eq 'New Problem Variation' ||
+          $ENV{'form.newrandomization'} eq 'New Randomization') {
 	  my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
 	  &Apache::lonnet::tmpreset($symb,'',$domain,$name);
+&Apache::lonxml::debug("Attempt reset");
       }
   }
   if ($ENV{'request.state'} eq "construct") {