--- loncom/auth/loncacc.pm	2008/11/19 17:38:21	1.48
+++ loncom/auth/loncacc.pm	2011/10/25 18:37:11	1.56
@@ -2,7 +2,7 @@
 # Cookie Based Access Handler for Construction Area
 # (lonacc: 5/21/99,5/22,5/29,5/31 Gerd Kortemeyer)
 #
-# $Id: loncacc.pm,v 1.48 2008/11/19 17:38:21 jms Exp $
+# $Id: loncacc.pm,v 1.56 2011/10/25 18:37:11 www Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -75,12 +75,12 @@ store where they wanted to go (first url
 
 =over
 
-=item constructaccess($url,$ownerdomain)
+=item constructaccess($url,$setpriv)
 
 See if the owner domain and name
 in the URL match those in the expected environment.  If so, return 
 two element list ($ownername,$ownerdomain).  Else, return null string.
-
+If 'setpriv' is set to 'setpriv', it actually assigns the privileges.
 =back
 
 =cut
@@ -97,26 +97,61 @@ use Apache::lonacc;
 use LONCAPA qw(:DEFAULT :match);
 
 sub constructaccess {
-    my ($url,$ownerdomain)=@_;
-    my ($ownername)=($url=~/\/(?:\~|priv\/|home\/)($match_username)\//);
-    unless (($ownername) && ($ownerdomain)) { return ''; }
-    # We do not allow editing of previous versions of files.
+    my ($url,$setpriv)=@_;
+
+# We do not allow editing of previous versions of files
     if ($url=~/\.(\d+)\.(\w+)$/) { return ''; }
-    my @possibledomains = &Apache::lonnet::current_machine_domains();
-    if ($ownername eq $env{'user.name'}) {
-	foreach my $domain (@possibledomains) {
-	    if ($domain eq $env{'user.domain'}) {
-		return ($ownername,$domain);
-	    }
+
+# Get username and domain from URL
+    my ($ownerdomain,$ownername)=($url=~/^(?:\/home\/httpd\/html\/|\/)priv\/($match_domain)\/($match_username)\//);
+
+# The URL does not really point to any authorspace, forget it
+    unless (($ownername) && ($ownerdomain)) { return ''; }
+  
+# Now we need to see if the user has access to the authorspace of
+# $ownername at $ownerdomain
+
+    if (($ownername eq $env{'user.name'}) && ($ownerdomain eq $env{'user.domain'})) {
+# Real author for this?
+       if (exists($env{'user.priv.au./'.$ownerdomain.'/./'})) {
+          return ($ownername,$ownerdomain);
+       }
+    } else {
+# Co-author for this?
+	if (exists($env{'user.priv.ca./'.$ownerdomain.'/'.$ownername.'./'}) ||
+	    exists($env{'user.priv.aa./'.$ownerdomain.'/'.$ownername.'./'}) ) {
+	    return ($ownername,$ownerdomain);
 	}
     }
-    
-    foreach my $domain (@possibledomains) {
-	if (exists($env{'user.priv.ca./'.$domain.'/'.$ownername.'./'}) ||
-	    exists($env{'user.priv.aa./'.$domain.'/'.$ownername.'./'}) ) {
-	    return ($ownername,$domain);
-	}
+# We don't have any access right now. If we are not possibly going to do anything about this,
+# we might as well leave
+   unless ($setpriv) { return ''; }
+
+# Backdoor access?
+    my $allowed=&Apache::lonnet::allowed('eco',$ownerdomain);
+# Nope
+    unless ($allowed) { return ''; }
+# Looks like we may have access, but could be locked by the owner of the construction space
+    if ($allowed eq 'U') {
+        my %blocked=&Apache::lonnet::get('environment',['domcoord.author'],
+                                         $ownerdomain,$ownername);
+# Is blocked by owner
+        if ($blocked{'domcoord.author'} eq 'blocked') { return ''; }
+    }
+    if (($allowed eq 'F') || ($allowed eq 'U')) {
+# Grant temporary access
+        my $then=$env{'user.login.time'};
+        my $update==$env{'user.update.time'};
+        if (!$update) { $update = $then; }
+        my $refresh=$env{'user.refresh.time'};
+        if (!$refresh) { $refresh = $update; }
+        my $now = time;
+        &Apache::lonnet::check_adhoc_privs($ownerdomain,$ownername,
+                                           $update,$refresh,$now,'ca',
+                                           'constructaccess');
+        return($ownername,$ownerdomain);
     }
+# No business here
     return '';
 }
 
@@ -141,7 +176,7 @@ sub handler {
 	$env{'request.state'}    = "construct";
 	$env{'request.filename'} = $r->filename;
 
-	unless (&constructaccess($requrl,$r->dir_config('lonDefDomain'))) {
+	unless (&constructaccess($requrl,'setpriv')) {
 	    $r->log_reason("Unauthorized $requrl", $r->filename); 
 	    return HTTP_NOT_ACCEPTABLE;
 	}