=pod

=encoding utf8

=head1 NAME

Lemonldap:NG::Portal::Auth - Writing authentication modules for LemonLDAP::NG.

=head1 SYNOPSIS

  package Lemonldap::NG::Portal::Auth::My;
  
  use strict;
  use Mouse;
  # Add constants used by this module
  use Lemonldap::NG::Portal::Main::Constants qw(PE_OK);
  
  our $VERSION = '0.1';
  
  # Directive provides by Mouse
  extends 'Lemonldap::NG::Portal::Main::Auth';

  sub init {
      ...
  }
  
  sub extractFormInfo {
      my ( $self, $req ) = @_;
      ...
  }
  
  sub authenticate {
      my ( $self, $req ) = @_;
      ...
  }
  
  sub setAuthSessionInfo {
      my ( $self, $req ) = @_;
      ...
  }
  
  sub authLogout {
      my ( $self, $req ) = @_;
      ...
  }
  
  sub getDisplayType {
      return ...;
  }
  
  1;

=head1 DESCRIPTION

Lemonldap::NG::Portal::Main::Auth must be used to build Lemonldap::NG authentication
modules. Authentication modules are independent objects that are instantiated
by Lemonldap::NG portal. They must provide methods described below.

=head1 METHODS

=head2 Accessors and methods provided by Lemonldap::NG::Portal::Main::Auth

=over

=item p: portal object

=item conf: configuration hash (as reference)

=item logger alias for p->logger accessor

=item userLogger alias for p->userLogger accessor

=item error: alias for p->error method

=item authnLevel: Lemonldap::NG authentication level

=back

=head3 "Routes" management

Like each module that inherits from Lemonldap::NG::Portal::Plugin,
Lemonldap::NG::Portal::Main::Auth provides URI path functions:

=over

=item addAuthRoute: wrapper to L<Lemonldap::NG::Handler::PSGI::Try>
addAuthRoute() method

=item addUnauthRoute: wrapper to L<Lemonldap::NG::Handler::PSGI::Try>
addUnauthRoute() method

=back

Example:

  sub init {
      ...
      $self->addAuthRoute( saml => { proxy => "proxySub" }, [ 'GET', 'POST' ] );
      ...
  }
  sub proxySub {
      my ( $self, $req ) = @_;
      ...
      # This sub must return a PSGI response. Example
      return [ 302, [ Location => 'http://x.y/' ], [] ];
  }

This means that requests http://auth.../saml/proxy will be given to proxySub()
method.

=head2 Methods that must be provided by an authentication module

=head3 init()

Method launched after object creation (after each configuration reload). It
must return a true value if authentication module is ready, false else.

=head3 Methods called at each request

All these methods must return a Lemonldap::NG::Portal::Main::Constants value.
They are called with one argument: a L<Lemonldap::NG::Portal::Main::Request>
object.

Note: if you want to change process() next steps, you just have to change
$req->steps array.

=head4 extractFormInfo($req)

First authentication method called during authentication process. It must set
$req->user that will be used by the userDB object to get user information.

=head4 authenticate($req)

Last method called during authentication process.

=head4 setAuthSessionInfo($req)

Method that must at least set $req->{sessionInfo}->{authenticationLevel} to
an integer that indicates the strong of authentication.

Proposed levels:

=over

=item 1: low level

=item 2: web form level

=item 3: session based level (Kerberos for example)

=item 5: strong authentication

=back

=head4 authForce($req)

=head4 authLogout($req)

=head1 LOGGING

Logging is provided by $self->logger and $self->userLogger. The following rules
must be applied:

=over

=item logger->debug: technical debugging messages

=item logger->info: simple technical information

=item logger->notice: technical information that could interest administrators

=item logger->warn: technical warning

=item logger->error: error that must be reported to administrator

=item userLogger->info: simple information about user's action

=item userLogger->notice: information that may be registered (auth success,...)

=item userLogger->warn: bad action of a user (auth failure). Auth/Combination
transform it to "info" when another authentication scheme is available

=item userLogger->error: bad action of a user that must be reported, (even if
another backend is available with Combination)

=back

=head1 AUTHORS

=over

=item LemonLDAP::NG team L<http://lemonldap-ng.org/team>

=back

=head1 BUG REPORT

Use OW2 system to report bug or ask for features:
L<https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/issues>

=head1 DOWNLOAD

Lemonldap::NG is available at
L<https://lemonldap-ng.org/download>

=head1 COPYRIGHT AND LICENSE

See COPYING file for details.

This library is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see L<http://www.gnu.org/licenses/>.

=cut