--- loncom/homework/lonhomework.pm	2003/09/19 20:29:29	1.150
+++ loncom/homework/lonhomework.pm	2004/02/13 21:21:30	1.163
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # The LON-CAPA Homework handler
 #
-# $Id: lonhomework.pm,v 1.150 2003/09/19 20:29:29 albertel Exp $
+# $Id: lonhomework.pm,v 1.163 2004/02/13 21:21:30 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -24,11 +24,7 @@
 # /home/httpd/html/adm/gpl.txt
 #
 # http://www.lon-capa.org/
-#
-# Guy Albertelli
-# 11/30 Gerd Kortemeyer
-# 6/1,8/17,8/18 Gerd Kortemeyer
-# 7/18 Jeremy Bowers
+
 
 package Apache::lonhomework;
 use strict;
@@ -147,6 +143,51 @@ 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 {
@@ -163,53 +204,63 @@ sub check_access {
 	&Apache::lonxml::debug("in construction ignoring dates");
 	$status='CAN_ANSWER';
 	$datemsg=&mt('is in under construction');
-	return ($status,$datemsg);
+#	return ($status,$datemsg);
     }
 
     &Apache::lonxml::debug("checking for part :$id:");
     &Apache::lonxml::debug("time:".time);
-    foreach $temp ("opendate","duedate","answerdate") {
-	$lastdate = $date;
-	$date = &Apache::lonnet::EXT("resource.$id.$temp");
-	my $thistype = &Apache::lonnet::EXT("resource.$id.$temp.type");
-	if ($thistype =~ /^(con_lost|no_such_host)/ ||
-	    $date     =~ /^(con_lost|no_such_host)/) {
-	    $status='UNAVAILABLE';
-	    $date=&mt("may open later.");
+
+    if ($ENV{'request.state'} ne "construct") {
+	my $allowed=&check_ip_acc(&Apache::lonnet::EXT("resource.$id.acc"));
+	if (!$allowed && ($Apache::lonhomework::browse ne 'F')) {
+	    $status='INVALID_ACCESS';
+	    $date=&mt("can not be accessed from your location.");
 	    return($status,$date);
 	}
-	if ($thistype eq 'date_interval') {
-	    if ($temp eq 'opendate') {
-		$date=&Apache::lonnet::EXT("resource.$id.duedate")-$date;
-	    }
-	    if ($temp eq 'answerdate') {
-		$date=&Apache::lonnet::EXT("resource.$id.duedate")+$date;
+	
+	foreach $temp ("opendate","duedate","answerdate") {
+	    $lastdate = $date;
+	    $date = &Apache::lonnet::EXT("resource.$id.$temp");
+	    my $thistype = &Apache::lonnet::EXT("resource.$id.$temp.type");
+	    if ($thistype =~ /^(con_lost|no_such_host)/ ||
+		$date     =~ /^(con_lost|no_such_host)/) {
+		$status='UNAVAILABLE';
+		$date=&mt("may open later.");
+		return($status,$date);
 	    }
+	    if ($thistype eq 'date_interval') {
+		if ($temp eq 'opendate') {
+		    $date=&Apache::lonnet::EXT("resource.$id.duedate")-$date;
+		}
+		if ($temp eq 'answerdate') {
+		    $date=&Apache::lonnet::EXT("resource.$id.duedate")+$date;
+		}
+	    }
+	    &Apache::lonxml::debug("found :$date: for :$temp:");
+	    if ($date eq '') {
+		$date = &mt("an unknown date"); $passed = 0;
+	    } elsif ($date eq 'con_lost') {
+		$date = &mt("an indeterminate date"); $passed = 0;
+	    } else {
+		if (time < $date) { $passed = 0; } else { $passed = 1; }
+		$date = localtime $date;
+	    }
+	    if (!$passed) { $type=$temp; last; }
 	}
-	&Apache::lonxml::debug("found :$date: for :$temp:");
-	if ($date eq '') {
-	    $date = &mt("an unknown date"); $passed = 0;
-	} elsif ($date eq 'con_lost') {
-	    $date = &mt("an indeterminate date"); $passed = 0;
-	} else {
-	    if (time < $date) { $passed = 0; } else { $passed = 1; }
-	    $date = localtime $date;
+	&Apache::lonxml::debug("have :$type:$passed:");
+	if ($passed) {
+	    $status='SHOW_ANSWER';
+	    $datemsg=$date;
+	} elsif ($type eq 'opendate') {
+	    $status='CLOSED';
+	    $datemsg = &mt("will open on")." $date";
+	} elsif ($type eq 'duedate') {
+	    $status='CAN_ANSWER';
+	    $datemsg = &mt("is due at")." $date";
+	} elsif ($type eq 'answerdate') {
+	    $status='CLOSED';
+	    $datemsg = &mt("was due on")." $lastdate".&mt(", and answers will be available on")." $date";
 	}
-	if (!$passed) { $type=$temp; last; }
-    }
-    &Apache::lonxml::debug("have :$type:$passed:");
-    if ($passed) {
-	$status='SHOW_ANSWER';
-	$datemsg=$date;
-    } elsif ($type eq 'opendate') {
-	$status='CLOSED';
-	$datemsg = &mt("will open on")." $date";
-    } elsif ($type eq 'duedate') {
-	$status='CAN_ANSWER';
-	$datemsg = &mt("is due at")." $date";
-    } elsif ($type eq 'answerdate') {
-	$status='CLOSED';
-	$datemsg = &mt("was due on")." $lastdate".&mt(", and answers will be available on")." $date";
     }
     if ($status eq 'CAN_ANSWER') {
 	#check #tries, and if correct.
@@ -307,11 +358,10 @@ sub setuppermissions {
 sub setupheader {
     my $request=$_[0];
     if ($ENV{'browser.mathml'}) {
-	$request->content_type('text/xml');
+	&Apache::loncommon::content_type($request,'text/xml');
     } else {
-	$request->content_type('text/html');
+	&Apache::loncommon::content_type($request,'text/html');
     }
-    $request->content_encoding('UTF-8');
     if (!$Apache::lonxml::debug && ($ENV{'REQUEST_METHOD'} eq 'GET')) {
 	&Apache::loncommon::no_cache($request);
     }
@@ -327,6 +377,8 @@ sub handle_save_or_undo {
     my $filetmp =$file.".tmp";
     my $error=0;
 
+    &Apache::lonnet::correct_line_ends($result);
+
     if ($ENV{'form.Undo'} eq &mt('undo')) {
 	my $error=0;
 	if (!copy($file,$filetmp)) { $error=1; }
@@ -440,12 +492,12 @@ sub analyze {
 	    }
 	    $request->print('</table>');
 	} else {
-	    $request->print('<p>'.&mt('Part').' '.$part.' '.
+	    $request->print('<p>'.&mt('Response').' '.$part.' '.
 			    &mt('is not analyzable at this time').'</p>');
 	}
     }
     if (scalar(keys(%allparts)) == 0 ) {
-	$request->print('<p>'.&mt('Found no analyzable parts in this problem, currently only Numerical, Formula and String response styles are supported.').'</p>');
+	$request->print('<p>'.&mt('Found no analyzable respones in this problem, currently only Numerical, Formula and String response styles are supported.').'</p>');
     }
     &Apache::lonhtmlcommon::Close_PrgWin($request,\%prog_state);
     &analyze_footer($request);
@@ -474,8 +526,12 @@ sub editxmlmode {
 	&renderpage($request,$file);
     } else {
 	my ($rows,$cols) = &Apache::edit::textarea_sizes(\$problem);
-	my $xml_help = Apache::loncommon::helpLatexCheatsheet("Problem_Editor_XML_Index",
-							      "Problem Editing Help");
+	my $xml_help = '<table><tr><td>'.
+	    &Apache::loncommon::helpLatexCheatsheet("Problem_Editor_XML_Index",
+						    "Problem Editing Help").
+						    '</td><td>'.
+       &Apache::loncommon::help_open_faq(5).
+       &Apache::loncommon::help_open_bug('Authoring').'</td></tr></table>';
 	if ($cols > 80) { $cols = 80; }
 	if ($cols < 70) { $cols = 70; }
 	if ($rows < 20) { $rows = 20; }
@@ -503,6 +559,7 @@ sub renderpage {
     my ($request,$file) = @_;
 
     my (@targets) = &get_target();
+    &Apache::lonhomework::showhashsubset(\%ENV,'form.');
     &Apache::lonxml::debug("Running targets ".join(':',@targets));
     foreach my $target (@targets) {
 	#my $t0 = [&gettimeofday()];
@@ -590,12 +647,15 @@ sub newproblem {
 	&renderpage($request,$dest);
     } else {
 	my $url=$request->uri;
+	my $shownurl=$url;
+	$shownurl=~s-^/~-/priv/-;
 	my $dest = &Apache::lonnet::filelocation("",$request->uri);
 	my $errormsg;
 	if ($ENV{'form.newfile'}) {
 	    $errormsg='<p><font color="red">'.&mt('You did not select a template.').'</font></p>'."\n";
 	}
 	my $instructions;
+	my $bodytag=&Apache::loncommon::bodytag(undef,undef,undef,1);
 	if ($templatelist) { $instructions=&mt(", select a template from the pull-down menu below.").'<br />'.&mt("Then");}
 	my %lt=&Apache::lonlocal::texthash( 'create' => 'Creating a new',
 			  'resource' => 'resource',
@@ -606,10 +666,10 @@ sub newproblem {
 			  'Create' => 'Create',
 			  'button' => 'button');
 	$request->print(<<ENDNEWPROBLEM);
-<body bgcolor="#FFFFFF">
+$bodytag
 <h1>$lt{'create'} $extension $lt{'resource'}</h1>
 $errormsg
-$lt{'requested'} <tt>$url</tt> $lt{'not exist'}.
+$lt{'requested'} <tt>$shownurl</tt> $lt{'not exist'}.
 <p>
 <b>$lt{'createnew'} $extension$instructions $lt{'click'} "$lt{'Create'} $extension" $lt{'button'}.</b>
 </p>
@@ -648,7 +708,6 @@ sub handler {
     my $request=$_[0];
     
     $Apache::lonxml::debug=$ENV{'user.debug'};
-
     if (&setupheader($request)) { return OK; }
     $ENV{'request.uri'}=$request->uri;