--- loncom/auth/lonroles.pm 2005/12/20 15:47:07 1.140
+++ loncom/auth/lonroles.pm 2009/05/17 23:38:12 1.222
@@ -1,7 +1,7 @@
# The LearningOnline Network with CAPA
# User Roles Screen
#
-# $Id: lonroles.pm,v 1.140 2005/12/20 15:47:07 raeburn Exp $
+# $Id: lonroles.pm,v 1.222 2009/05/17 23:38:12 bisitz Exp $
#
# Copyright Michigan State University Board of Trustees
#
@@ -27,6 +27,103 @@
#
###
+=pod
+
+=head1 NAME
+
+Apache::lonroles - User Roles Screen
+
+=head1 SYNOPSIS
+
+Invoked by /etc/httpd/conf/srm.conf:
+
+
+ PerlAccessHandler Apache::lonacc
+ SetHandler perl-script
+ PerlHandler Apache::lonroles
+ ErrorDocument 403 /adm/login
+ ErrorDocument 500 /adm/errorhandler
+
+
+=head1 OVERVIEW
+
+=head2 Choosing Roles
+
+C is a handler that allows a user to switch roles in
+mid-session. LON-CAPA attempts to work with "No Role Specified", the
+default role that a user has before selecting a role, as widely as
+possible, but certain handlers for example need specification which
+course they should act on, etc. Both in this scenario, and when the
+handler determines via C's C<&allowed> function that a certain
+action is not allowed, C is used as error handler. This
+allows the user to select another role which may have permission to do
+what they were trying to do. C can also be accessed via the
+B button in the Remote Control.
+
+=begin latex
+
+\begin{figure}
+\begin{center}
+\includegraphics[width=0.45\paperwidth,keepaspectratio]{Sample_Roles_Screen}
+ \caption{\label{Sample_Roles_Screen}Sample Roles Screen}
+\end{center}
+\end{figure}
+
+=end latex
+
+=head2 Role Initialization
+
+The privileges for a user are established at login time and stored in the session environment. As a consequence, a new role does not become active till the next login. Handlers are able to query for privileges using C's C<&allowed> function. When a user first logs in, their role is the "common" role, which means that they have the sum of all of their privileges. During a session it might become necessary to choose a particular role, which as a consequence also limits the user to only the privileges in that particular role.
+
+=head1 INTRODUCTION
+
+This module enables a user to select what role he wishes to
+operate under (instructor, student, teaching assistant, course
+coordinator, etc). These roles are pre-established by the actions
+of upper-level users.
+
+This is part of the LearningOnline Network with CAPA project
+described at http://www.lon-capa.org.
+
+=head1 HANDLER SUBROUTINE
+
+This routine is called by Apache and mod_perl.
+
+=over 4
+
+=item *
+
+Roles Initialization (yes/no)
+
+=item *
+
+Get Error Message from Environment
+
+=item *
+
+Who is this?
+
+=item *
+
+Generate Page Output
+
+=item *
+
+Choice or no choice
+
+=item *
+
+Table
+
+=item *
+
+Privileges
+
+=back
+
+=cut
+
+
package Apache::lonroles;
use strict;
@@ -39,7 +136,12 @@ use Apache::loncommon;
use Apache::lonhtmlcommon;
use Apache::lonannounce;
use Apache::lonlocal;
+use Apache::lonpageflip();
+use Apache::lonnavdisplay();
use GDBM_File;
+use LONCAPA qw(:DEFAULT :match);
+use HTML::Entities;
+
sub redirect_user {
my ($r,$title,$url,$msg,$launch_nav) = @_;
@@ -50,33 +152,45 @@ sub redirect_user {
my $swinfo=&Apache::lonmenu::rawconfig();
my $navwindow;
if ($launch_nav eq 'on') {
- $navwindow.=&Apache::lonnavmaps::launch_win('now',undef,undef,
- ($url =~ m-^/adm/whatsnew-));
+ $navwindow.=&Apache::lonnavdisplay::launch_win('now',undef,undef,
+ ($url =~ m-^/adm/whatsnew-));
} else {
$navwindow.=&Apache::lonnavmaps::close();
}
- my $bodytag=&Apache::loncommon::bodytag('Switching Role');
+ my $start_page = &Apache::loncommon::start_page('Switching Role',undef,
+ {'redirect' => [1,$url],});
+ my $end_page = &Apache::loncommon::end_page();
+
# Note to style police:
# This must only replace the spaces, nothing else, or it bombs elsewhere.
$url=~s/ /\%20/g;
$r->print(<$title
-
-
-
-$bodytag
+$start_page
$navwindow
-$msg
-Continue
-
-