--- loncom/lonnet/perl/lonnet.pm	2000/12/28 19:57:30	1.82
+++ loncom/lonnet/perl/lonnet.pm	2001/01/05 20:45:09	1.87
@@ -81,7 +81,9 @@
 # 10/06,10/09,10/10,10/11,10/14,10/20,10/23,10/25,10/26,10/27,10/28,10/29, 
 # 10/30,10/31,
 # 11/2,11/14,11/15,11/16,11/20,11/21,11/22,11/25,11/27,
-# 12/02,12/12,12/13,12/14,12/28 Gerd Kortemeyer
+# 12/02,12/12,12/13,12/14,12/28,12/29 Gerd Kortemeyer
+# 05/01/01 Guy Albertelli
+# 05/01 Gerd Kortemeyer
 
 package Apache::lonnet;
 
@@ -258,9 +260,11 @@ sub appenv {
 	return 'error';
      }
      my $newname;
+     flock($fh,'LOCK_EX');
      foreach $newname (keys %newenv) {
 	 print $fh "$newname=$newenv{$newname}\n";
      }
+     $fh->close();
     }
     return 'ok';
 }
@@ -287,9 +291,11 @@ sub delenv {
      unless ($fh=Apache::File->new(">$ENV{'user.environment'}")) {
 	return 'error';
      }
+     flock($fh,'LOCK_EX');
      map {
 	 unless ($_=~/^$delthis/) { print $fh $_; }
      } @oldenv;
+     $fh->close();
     }
     return 'ok';
 }
@@ -901,8 +907,9 @@ sub allowed {
 # Course: uri itself is a course
     my $courseuri=$uri;
     $courseuri=~s/\_(\d)/\/$1/;
+    $courseuri=~s/^([^\/])/\/$1/;
 
-    if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.$courseuri}
+    if ($ENV{'user.priv.'.$ENV{'request.role'}.'.'.$courseuri}
        =~/$priv\&([^\:]*)/) {
        $thisallowed.=$1;
     }
@@ -944,7 +951,7 @@ sub allowed {
                $checkreferer=0;
            }
        }
-
+       
        if (($ENV{'HTTP_REFERER'}) && ($checkreferer)) {
 	  my $refuri=$ENV{'HTTP_REFERER'};
           $refuri=~s/^http\:\/\/$ENV{'request.host'}//i;
@@ -1165,13 +1172,12 @@ sub filedescription {
 sub assignrole {
     my ($udom,$uname,$url,$role,$end,$start)=@_;
     my $mrole;
-    $url=declutter($url);
     if ($role =~ /^cr\//) {
 	unless (&allowed('ccr',$url)) { return 'refused'; }
         $mrole='cr';
     } else {
         my $cwosec=$url;
-        $cwosec=~s/^(\w+)\/(\w+)\/.*/$1\/$2/;
+        $cwosec=~s/^\/(\w+)\/(\w+)\/.*/$1\/$2/;
         unless (&allowed('c'.$role,$cwosec)) { return 'refused'; }
         $mrole=$role;
     }
@@ -1292,7 +1298,7 @@ sub modifystudent {
 	return 'error: '.$reply;
     }
 # ---------------------------------------------------- Add student role to user
-    my $uurl=$cid;
+    my $uurl='/'.$cid;
     $uurl=~s/\_/\//g;
     if ($usec) {
 	$uurl.='/'.$usec;
@@ -1300,6 +1306,64 @@ sub modifystudent {
     return &assignrole($udom,$uname,$uurl,'st',$end,$start);
 }
 
+# ------------------------------------------------- Write to course preferences
+
+sub writecoursepref {
+    my ($courseid,%prefs)=@_;
+    $courseid=~s/^\///;
+    $courseid=~s/\_/\//g;
+    my ($cdomain,$cnum)=split(/\//,$courseid);
+    my $chome=homeserver($cnum,$cdomain);
+    if (($chome eq '') || ($chome eq 'no_host')) { 
+	return 'error: no such course';
+    }
+    my $cstring='';
+    map {
+	$cstring.=escape($_).'='.escape($prefs{$_}).'&';
+    } keys %prefs;
+    $cstring=~s/\&$//;
+    return reply('put:'.$cdomain.':'.$cnum.':environment:'.$cstring,$chome);
+}
+
+# ---------------------------------------------------------- Make/modify course
+
+sub createcourse {
+    my ($udom,$description,$url)=@_;
+    $url=&declutter($url);
+    my $cid='';
+    unless (&allowed('ccc',$ENV{'user.domain'})) {
+        return 'refused';
+    }
+    unless ($udom eq $ENV{'user.domain'}) {
+        return 'refused';
+    }
+# ------------------------------------------------------------------- Create ID
+   my $uname=substr($$.time,0,5).unpack("H8",pack("I32",time)).
+       unpack("H2",pack("I32",int(rand(255)))).$perlvar{'lonHostID'};
+# ----------------------------------------------- Make sure that does not exist
+   my $uhome=&homeserver($uname,$udom);
+   unless (($uhome eq '') || ($uhome eq 'no_host')) {
+       $uname=substr($$.time,0,5).unpack("H8",pack("I32",time)).
+        unpack("H2",pack("I32",int(rand(255)))).$perlvar{'lonHostID'};
+       $uhome=&homeserver($uname,$udom);       
+       unless (($uhome eq '') || ($uhome eq 'no_host')) {
+           return 'error: unable to generate unique course-ID';
+       } 
+   }
+# ------------------------------------------------------------- Make the course
+    my $reply=&reply('encrypt:makeuser:'.$udom.':'.$uname.':none::',
+                      $ENV{'user.home'});
+    unless ($reply eq 'ok') { return 'error: '.$reply; }
+    my $uhome=&homeserver($uname,$udom);
+    if (($uhome eq '') || ($uhome eq 'no_host')) { 
+	return 'error: no such course';
+    }
+    &writecoursepref($udom.'_'.$uname,
+                     ('description' => $description,
+                      'url'         => $url));
+    return '/'.$udom.'/'.$uname;
+}
+
 # ---------------------------------------------------------- Assign Custom Role
 
 sub assigncustomrole {