--- loncom/lond	2023/05/22 21:10:56	1.577
+++ loncom/lond	2023/12/22 18:50:55	1.580
@@ -2,7 +2,7 @@
 # The LearningOnline Network
 # lond "LON Daemon" Server (port "LOND" 5663)
 #
-# $Id: lond,v 1.577 2023/05/22 21:10:56 raeburn Exp $
+# $Id: lond,v 1.580 2023/12/22 18:50:55 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -65,7 +65,7 @@ my $DEBUG = 0;		       # Non zero to ena
 my $status='';
 my $lastlog='';
 
-my $VERSION='$Revision: 1.577 $'; #' stupid emacs
+my $VERSION='$Revision: 1.580 $'; #' stupid emacs
 my $remoteVERSION;
 my $currenthostid="default";
 my $currentdomainid;
@@ -5265,9 +5265,9 @@ sub encrypted_get_domain_handler {
 #   0       - Exit.
 #  Side effects:
 #     The reply will contain an LTI itemID, if the signed LTI payload
-#     could be verified using the consumer key and the shared secret 
-#     available for that key (for the itemID) for either the course or domain, 
-#     depending on values for cnum and context. The reply is encrypted before 
+#     could be verified using the consumer key and the shared secret
+#     available for that key (for the itemID) for either the course or domain,
+#     depending on values for cnum and context. The reply is encrypted before
 #     being written to $client.
 #
 sub lti_handler {
@@ -5308,21 +5308,25 @@ sub lti_handler {
 &register_handler("lti", \&lti_handler, 1, 1, 0);
 
 #
-# LTI data for launch payload (received encrypted) are unencrypted and
+# Data for LTI payload (received encrypted) are unencrypted and
 # then signed with the appropriate key and secret, before re-encrypting
-# for sending as the signed payload to the client (caller lonnet::sign_lti()).
+# the signed payload which is sent to the client for unencryption by
+# the caller: lonnet::sign_lti()) before dispatch either to a web browser
+# (launch) or to a remote web service (roster, logout, or grade).  
 #
 # Parameters:
 #   $cmd             - Command request keyword (signlti).
 #   $tail            - Tail of the command.  This is a colon-separated list
 #                      consisting of the domain, coursenum (if for an External
-#                      Tool defined in a course), crstool (true if defined in
-#                      a course), escaped launch URL, numeric ID of external tool
+#                      Tool defined in a course), crsdef (true if defined in
+#                      a course), type (linkprot or lti)
+#                      context (launch, roster, logout, or grade),
+#                      escaped launch URL, numeric ID of external tool,
 #                      version number for encryption key (if tool's LTI secret was
-#                      encrypted before storing), post (true if signed data are
-#                      to be returned from Net::OAuth, as a post_body),
-#                      a frozen hash of LTI launch parameters, and a frozen hash
-#                      of LTI config data (i.e., method => signature method).
+#                      encrypted before storing), a frozen hash of LTI launch 
+#                      parameters, and a frozen hash of LTI information,
+#                      (e.g., method => 'HMAC-SHA1',
+#                             respfmt => 'to_authorization_header').
 #   $client          - File descriptor open on the client.
 # Returns:
 #   1       - Continue processing.
@@ -5330,8 +5334,8 @@ sub lti_handler {
 #  Side effects:
 #     The reply will contain the LTI payload, as & separated key=value pairs,
 #     where value is itself a frozen hash, if the required key and secret
-#     for the apecific tool ID are available. The payload data are retrived from
-#     a call to Lond::sign_params(), and the reply is encrypted before being
+#     for the specific tool ID are available. The payload data are retrieved from
+#     a call to Lond::sign_lti_payload(), and the reply is encrypted before being
 #     written to $client.
 #
 sub sign_lti_handler {
@@ -5339,13 +5343,14 @@ sub sign_lti_handler {
 
     my $userinput = "$cmd:$tail";
 
-    my ($cdom,$cnum,$crstool,$escurl,$idx,$keynum,$post,$paramsref,$inforef) = split(/:/,$tail);
+    my ($cdom,$cnum,$crsdef,$type,$context,$escurl,
+        $ltinum,$keynum,$paramsref,$inforef) = split(/:/,$tail);
     my $url = &unescape($escurl);
     my $params = &Apache::lonnet::thaw_unescape($paramsref);
     my $info = &Apache::lonnet::thaw_unescape($inforef);
     my $res =
-        &LONCAPA::Lond::sign_params($cdom,$cnum,$crstool,$url,$idx,$keynum,
-                                    $post,$perlvar{'lonVersion'},$params,$info);
+        &LONCAPA::Lond::sign_lti_payload($cdom,$cnum,$crsdef,$type,$context,$url,$ltinum,
+                                         $keynum,$perlvar{'lonVersion'},$params,$info);
     my $result;
     if (ref($res) eq 'HASH') {
         foreach my $key (keys(%{$res})) {
@@ -8875,6 +8880,9 @@ sub currentversion {
     if (-e $ulsdir) {
 	if(-d $ulsdir) {
 	    if (opendir(LSDIR,$ulsdir)) {
+                if (-e $fname) {
+                    $version=0;
+                }
 		my $ulsfn;
 		while ($ulsfn=readdir(LSDIR)) {
 # see if this is a regular file (ignore links produced earlier)
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>500 Internal Server Error</title>
</head><body>
<h1>Internal Server Error</h1>
<p>The server encountered an internal error or
misconfiguration and was unable to complete
your request.</p>
<p>Please contact the server administrator at 
 root@localhost to inform them of the time this error occurred,
 and the actions you performed just before this error.</p>
<p>More information about this error may be available
in the server error log.</p>
</body></html>