#!/usr/bin/perl

# This file is part of Koha.
#
# Koha 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 3 of the License, or
# (at your option) any later version.
#
# Koha 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 Koha; if not, see <http://www.gnu.org/licenses>.

use Modern::Perl;

use Test::More tests => 4;
use Test::MockModule;
use Test::MockObject;
use Test::Warn;

use C4::Context;

my $dbh = C4::Context->dbh;
# Start transaction
$dbh->{ AutoCommit } = 0;
$dbh->{ RaiseError } = 1;

# Variables controlling LDAP server config
my $update         = 0;
my $replicate      = 0;
my $auth_by_bind   = 1;
my $anonymous_bind = 1;
# Variables controlling LDAP behaviour
my $desired_authentication_result = 'success';
my $desired_connection_result     = 'error';
my $desired_bind_result           = 'error';
my $desired_compare_result        = 'error';
my $desired_search_result         = 'error';
my $desired_count_result          = 1;
my $non_anonymous_bind_result     = 'error';
my $ret;

# Mock the context module
my $context     = new Test::MockModule( 'C4::Context' );
$context->mock( 'config', \&mockedC4Config );

# Mock the Net::LDAP module
my $ldap = new Test::MockModule( 'Net::LDAP' );

$ldap->mock( 'new',  sub {
    if ( $desired_connection_result eq 'error' ) {
        # We were asked to fail the LDAP conexion
        return;
    } else {
        # Return a mocked Net::LDAP object (Test::MockObject)
        return mock_net_ldap();
    }
});


# C4::Auth_with_ldap needs several stuff set first ^^^
use_ok( 'C4::Auth_with_ldap' );
can_ok( 'C4::Auth_with_ldap', qw/
        checkpw_ldap
        search_method /);

subtest "checkpw_ldap tests" => sub {

    plan tests => 4;

    ## Connection fail tests
    $desired_connection_result = 'error';
    warning_is { $ret = C4::Auth_with_ldap::checkpw_ldap( $dbh, 'hola', password => 'hey' ) }
        "LDAP connexion failed",
        "checkpw_ldap prints correct warning if LDAP conexion fails";
    is( $ret, 0, "checkpw_ldap returns 0 if LDAP conexion fails");

    ## Connection success tests
    $desired_connection_result = 'success';

    subtest "auth_by_bind = 1 tests" => sub {

        plan tests => 5;

        $auth_by_bind          = 1;

        $desired_authentication_result = 'success';
        $anonymous_bind        = 1;
        $desired_bind_result   = 'error';
        $desired_search_result = 'error';
        reload_ldap_module();


        warning_like { $ret = C4::Auth_with_ldap::checkpw_ldap(
                               $dbh, 'hola', password => 'hey' ) }
                    qr/Anonymous LDAP bind failed: LDAP error #1: error_name/,
                    "checkpw_ldap prints correct warning if LDAP anonymous bind fails";
        is( $ret, 0, "checkpw_ldap returns 0 if LDAP anonymous bind fails");

        $desired_authentication_result = 'success';
        $anonymous_bind        = 1;
        $desired_bind_result   = 'success';
        $desired_search_result = 'success';
        $desired_count_result  = 0; # user auth problem
        $non_anonymous_bind_result = 'success';
        reload_ldap_module();
        is ( C4::Auth_with_ldap::checkpw_ldap( $dbh, 'hola', password => 'hey' ),
            0, "checkpw_ldap returns 0 if user lookup returns 0");

        $non_anonymous_bind_result = 'error';
        reload_ldap_module();

        warning_like { $ret = C4::Auth_with_ldap::checkpw_ldap(
                               $dbh, 'hola', password => 'hey' ) }
                    qr/LDAP bind failed as kohauser hola: LDAP error #1: error_name/,
                    "checkpw_ldap prints correct warning if LDAP bind fails";
        is ( $ret, -1, "checkpw_ldap returns -1 LDAP bind fails for user (Bug 8148)");
    };

    subtest "auth_by_bind = 0 tests" => sub {

        plan tests => 8;

        $auth_by_bind = 0;

        # Anonymous bind
        $anonymous_bind            = 1;
        $desired_bind_result       = 'error';
        $non_anonymous_bind_result = 'error';
        reload_ldap_module();

        warning_like { $ret = C4::Auth_with_ldap::checkpw_ldap(
                               $dbh, 'hola', password => 'hey' ) }
                    qr/LDAP bind failed as ldapuser cn=Manager,dc=metavore,dc=com: LDAP error #1: error_name/,
                    "checkpw_ldap prints correct warning if LDAP bind fails";
        is ( $ret, 0, "checkpw_ldap returns 0 if bind fails");

        $anonymous_bind            = 1;
        $desired_bind_result       = 'success';
        $non_anonymous_bind_result = 'success';
        $desired_compare_result    = 'error';
        reload_ldap_module();

        warning_like { $ret = C4::Auth_with_ldap::checkpw_ldap(
                               $dbh, 'hola', password => 'hey' ) }
                    qr/LDAP Auth rejected : invalid password for user 'hola'. LDAP error #1: error_name/,
                    "checkpw_ldap prints correct warning if LDAP bind fails";
        is ( $ret, -1, "checkpw_ldap returns -1 if bind fails (Bug 8148)");

        # Non-anonymous bind
        $anonymous_bind            = 0;
        $desired_bind_result       = 'success';
        $non_anonymous_bind_result = 'error';
        $desired_compare_result    = 'dont care';
        reload_ldap_module();

        warning_like { $ret = C4::Auth_with_ldap::checkpw_ldap(
                               $dbh, 'hola', password => 'hey' ) }
                    qr/LDAP bind failed as ldapuser cn=Manager,dc=metavore,dc=com: LDAP error #1: error_name/,
                    "checkpw_ldap prints correct warning if LDAP bind fails";
        is ( $ret, 0, "checkpw_ldap returns 0 if bind fails");

        $anonymous_bind            = 0;
        $desired_bind_result       = 'success';
        $non_anonymous_bind_result = 'success';
        $desired_compare_result    = 'error';
        reload_ldap_module();

        warning_like { $ret = C4::Auth_with_ldap::checkpw_ldap(
                               $dbh, 'hola', password => 'hey' ) }
                    qr/LDAP Auth rejected : invalid password for user 'hola'. LDAP error #1: error_name/,
                    "checkpw_ldap prints correct warning if LDAP bind fails";
        is ( $ret, -1, "checkpw_ldap returns -1 if bind fails (Bug 8148)");

    };
};

subtest "search_method tests" => sub {

    plan tests => 5;

    my $ldap = mock_net_ldap();

    # Null params tests
    is( C4::Auth_with_ldap::search_method( $ldap, undef), undef,
        "search_method returns undef on undefined userid");
    is( C4::Auth_with_ldap::search_method( undef, "undef"), undef,
        "search_method returns undef on undefined ldap object");

    # search ->code and !->code
    $desired_search_result = 'error';
    reload_ldap_module();
    eval { $ret = C4::Auth_with_ldap::search_method( $ldap, "undef"); };
    like( $@, qr/LDAP search failed to return object : 1/,
        "search_method prints correct warning when db->search returns error code");

    $desired_search_result = 'success';
    $desired_count_result  = 2;
    reload_ldap_module();
    warning_like { $ret = C4::Auth_with_ldap::search_method( $ldap, '123') }
                   qr/^LDAP Auth rejected \: \(uid\=123\) gets 2 hits/,
                   "search_method prints correct warning when hits count is not 1";
    is( $ret, 0, "search_method returns 0 when hits count is not 1" );

};

# Function that mocks the call to C4::Context->config(param)
sub mockedC4Config {

    my $param =  shift;

    my %ldap_mapping = (
        firstname    => { is => 'givenname' },
        surname      => { is => 'sn' },
        address      => { is => 'postaladdress' },
        city         => { is => 'l' },
        zipcode      => { is => 'postalcode' },
        branchcode   => { is => 'branch' },
        userid       => { is => 'uid' },
        password     => { is => 'userpassword' },
        email        => { is => 'mail' },
        categorycode => { is => 'employeetype' },
        phone        => { is => 'telephonenumber' }
    );

    my %ldap_config  = (
        anonymous_bind => $anonymous_bind,
        auth_by_bind   => $auth_by_bind,
        base           => 'dc=metavore,dc=com',
        hostname       => 'localhost',
        mapping        => \%ldap_mapping,
        pass           => 'metavore',
        principal_name => '%s@my_domain.com',
        replicate      => $replicate,
        update         => $update,
        user           => 'cn=Manager,dc=metavore,dc=com'
    );

    return \%ldap_config;
};

# Function that mocks the call to Net::LDAP
sub mock_net_ldap {

    my $mocked_ldap = Test::MockObject->new();

    $mocked_ldap->mock( 'bind', sub {

        my @args = @_;
        my $mocked_message;

        if ( $#args > 1 ) {
            # Args passed => non-anonymous bind
            if ( $non_anonymous_bind_result eq 'error' ) {
                return mock_net_ldap_message(1,1,'error_name','error_text');
            } else {
                return mock_net_ldap_message(0,0,'','');
            }
        } else {
            $mocked_message = mock_net_ldap_message(
                ($desired_bind_result eq 'error' ) ? 1 : 0, # code
                ($desired_bind_result eq 'error' ) ? 1 : 0, # error
                ($desired_bind_result eq 'error' ) ? 'error_name' : 0, # error_name
                ($desired_bind_result eq 'error' ) ? 'error_text' : 0  # error_text
            );
        }

        return $mocked_message;
    });

    $mocked_ldap->mock( 'compare', sub {

        my $mocked_message;

        if ( $desired_compare_result eq 'error' ) {
            $mocked_message = mock_net_ldap_message(1,1,'error_name','error_text');
        } else {
            # we expect return code 6 for success
            $mocked_message = mock_net_ldap_message(6,0,'','');
        }

        return $mocked_message;
    });

    $mocked_ldap->mock( 'search', sub {

        return mock_net_ldap_search(
            ( $desired_count_result )             # count
                ? $desired_count_result
                : 1, # default to 1
            ( $desired_search_result eq 'error' ) # code
                ? 1
                : 0, # 0 == success
            ( $desired_search_result eq 'error' ) # error
                ? 1
                : 0,
            ( $desired_search_result eq 'error' ) # error_text
                ? 'error_text'
                : undef,
            ( $desired_search_result eq 'error' ) # error_name
                ? 'error_name'
                : undef,
            mock_net_ldap_entry( 'sampledn', 1 )  # shift_entry
        );

    });

    return $mocked_ldap;
}

sub mock_net_ldap_search {
    my ( $count, $code, $error, $error_text,
         $error_name, $shift_entry ) = @_;

    my $mocked_search = Test::MockObject->new();
    $mocked_search->mock( 'count',       sub { return $count; } );
    $mocked_search->mock( 'code',        sub { return $code; } );
    $mocked_search->mock( 'error',       sub { return $error; } );
    $mocked_search->mock( 'error_name',  sub { return $error_name; } );
    $mocked_search->mock( 'error_text',  sub { return $error_text; } );
    $mocked_search->mock( 'shift_entry', sub { return $shift_entry; } );

    return $mocked_search;
}

sub mock_net_ldap_message {
    my ( $code, $error, $error_name, $error_text ) = @_;

    my $mocked_message = Test::MockObject->new();
    $mocked_message->mock( 'code',       sub { $code } );
    $mocked_message->mock( 'error',      sub { $error } );
    $mocked_message->mock( 'error_name', sub { $error_name } );
    $mocked_message->mock( 'error_text', sub { $error_text } );

    return $mocked_message;
}

sub mock_net_ldap_entry {
    my ( $dn, $exists ) = @_;

    my $mocked_entry = Test::MockObject->new();
    $mocked_entry->mock( 'dn',     sub { return $dn; } );
    $mocked_entry->mock( 'exists', sub { return $exists } );

    return $mocked_entry;
}

# TODO: Once we remove the global variables in C4::Auth_with_ldap
# we shouldn't need this...
# ... Horrible hack
sub reload_ldap_module {
    delete $INC{'C4/Auth_with_ldap.pm'};
    require C4::Auth_with_ldap;
    C4::Auth_with_ldap->import;
}

$dbh->rollback;

1;