--- loncom/lond	2009/10/29 03:23:52	1.432
+++ loncom/lond	2010/03/15 05:09:59	1.438
@@ -2,7 +2,7 @@
 # The LearningOnline Network
 # lond "LON Daemon" Server (port "LOND" 5663)
 #
-# $Id: lond,v 1.432 2009/10/29 03:23:52 raeburn Exp $
+# $Id: lond,v 1.438 2010/03/15 05:09:59 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -59,7 +59,7 @@ my $DEBUG = 0;		       # Non zero to ena
 my $status='';
 my $lastlog='';
 
-my $VERSION='$Revision: 1.432 $'; #' stupid emacs
+my $VERSION='$Revision: 1.438 $'; #' stupid emacs
 my $remoteVERSION;
 my $currenthostid="default";
 my $currentdomainid;
@@ -2062,16 +2062,10 @@ sub is_home_handler {
 &register_handler("home", \&is_home_handler, 0,1,0);
 
 #
-#   Process an update request for a resource?? I think what's going on here is
-#   that a resource has been modified that we hold a subscription to.
+#   Process an update request for a resource.
+#   A resource has been modified that we hold a subscription to.
 #   If the resource is not local, then we must update, or at least invalidate our
 #   cached copy of the resource. 
-#   FUTURE WORK:
-#      I need to look at this logic carefully.  My druthers would be to follow
-#      typical caching logic, and simple invalidate the cache, drop any subscription
-#      an let the next fetch start the ball rolling again... however that may
-#      actually be more difficult than it looks given the complex web of
-#      proxy servers.
 # Parameters:
 #    $cmd      - The command that got us here.
 #    $tail     - Tail of the command (remaining parameters).
@@ -2095,16 +2089,23 @@ sub update_resource_handler {
     my $ownership=ishome($fname);
     if ($ownership eq 'not_owner') {
 	if (-e $fname) {
+            # Delete preview file, if exists
+            unlink("$fname.tmp");
+            # Get usage stats
 	    my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,
 		$atime,$mtime,$ctime,$blksize,$blocks)=stat($fname);
 	    my $now=time;
 	    my $since=$now-$atime;
+            # If the file has not been used within lonExpire seconds,
+            # unsubscribe from it and delete local copy
 	    if ($since>$perlvar{'lonExpire'}) {
 		my $reply=&Apache::lonnet::reply("unsub:$fname","$clientname");
 		&devalidate_meta_cache($fname);
 		unlink("$fname");
 		unlink("$fname.meta");
 	    } else {
+            # Yes, this is in active use. Get a fresh copy. Since it might be in
+            # very active use and huge (like a movie), copy it to "in.transfer" filename first.
 		my $transname="$fname.in.transfer";
 		my $remoteurl=&Apache::lonnet::reply("sub:$fname","$clientname");
 		my $response;
@@ -2132,6 +2133,7 @@ sub update_resource_handler {
 			}
 			alarm(0);
 		    }
+                    # we successfully transfered, copy file over to real name
 		    rename($transname,$fname);
 		    &devalidate_meta_cache($fname);
 		}
@@ -3123,9 +3125,11 @@ sub dump_with_regexp {
 	my $count=0;
 	while (my ($key,$value) = each(%$hashref)) {
             if ($namespace eq 'roles') {
-                if ($key =~ /^($LONCAPA::match_domain)_($LONCAPA::match_community)_cc$/) {
-                    if ($clientversion =~ /^(\d+\.\d+)$/) {
-                        next if ($1 <= 2.9);
+                if ($key =~ /^($LONCAPA::match_domain)_($LONCAPA::match_community)_(cc|co|in|ta|ep|ad|st|cr)/) {
+                    if ($clientversion =~ /^(\d+)\.(\d+)$/) {
+                        my $major = $1;
+                        my $minor = $2;
+                        next if (($major < 2) || (($major == 2) && ($minor < 9)));
                     }
                 }
             }
@@ -3866,6 +3870,19 @@ sub dump_course_id_handler {
                             $items->{'cloners'} = $cloneruname.':'.$clonerudom;
                             $valchange = 1;
                         }
+                        unless ($canclone) {
+                            if ($items->{'owner'} =~ /:/) {
+                                if ($items->{'owner'} eq $cloner) {
+                                    $canclone = 1;
+                                }
+                            } elsif ($cloner eq $udom.':'.$items->{'owner'}) {
+                                $canclone = 1;
+                            }
+                            if ($canclone) {
+                                $items->{'cloners'} = $cloneruname.':'.$clonerudom;
+                                $valchange = 1;
+                            }
+                        }
                     }
                 }
                 if ($unpack || !$rtn_as_hash) {
@@ -4066,6 +4083,53 @@ sub dump_course_id_handler {
 }
 &register_handler("courseiddump", \&dump_course_id_handler, 0, 1, 0);
 
+sub course_lastaccess_handler {
+    my ($cmd, $tail, $client) = @_;
+    my $userinput = "$cmd:$tail";
+    my ($cdom,$cnum) = split(':',$tail); 
+    my (%lastaccess,$qresult);
+    my $hashref = &tie_domain_hash($cdom, "nohist_courseids", &GDBM_WRCREAT());
+    if ($hashref) {
+        while (my ($key,$value) = each(%$hashref)) {
+            my ($unesc_key,$lasttime);
+            $unesc_key = &unescape($key);
+            if ($cnum) {
+                next unless ($unesc_key =~ /\Q$cdom\E_\Q$cnum\E$/);
+            }
+            if ($unesc_key =~ /^lasttime:($LONCAPA::match_domain\_$LONCAPA::match_courseid)/) {
+                $lastaccess{$1} = $value;
+            } else {
+                my $items = &Apache::lonnet::thaw_unescape($value);
+                if (ref($items) eq 'HASH') {
+                    unless ($lastaccess{$unesc_key}) {
+                        $lastaccess{$unesc_key} = '';
+                    }
+                } else {
+                    my @courseitems = split(':',$value);
+                    $lastaccess{$unesc_key} = pop(@courseitems);
+                }
+            }
+        }
+        foreach my $cid (sort(keys(%lastaccess))) {
+            $qresult.=&escape($cid).'='.$lastaccess{$cid}.'&'; 
+        }
+        if (&untie_domain_hash($hashref)) {
+            if ($qresult) {
+                chop($qresult);
+            }
+            &Reply($client, \$qresult, $userinput);
+        } else {
+            &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+                    "while attempting lastacourseaccess\n", $userinput);
+        }
+    } else {
+        &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
+                "while attempting lastcourseaccess\n", $userinput);
+    }
+    return 1;
+}
+&register_handler("courselastaccess",\&course_lastaccess_handler, 0, 1, 0);
+
 #
 # Puts an unencrypted entry in a namespace db file at the domain level 
 #
@@ -6549,9 +6613,7 @@ sub rewrite_password_file {
 
 #     Returns the authorization type or nouser if there is no such user.
 #
-sub get_auth_type 
-{
-
+sub get_auth_type {
     my ($domain, $user)  = @_;
 
     Debug("get_auth_type( $domain, $user ) \n");