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package SL::Dispatcher;

use strict;

# Force scripts/locales.pl to parse these templates:
# parse_html_template('login_screen/auth_db_unreachable')
# parse_html_template('login_screen/user_login')
# parse_html_template('generic/error')

BEGIN {
use SL::System::Process;
my $exe_dir = SL::System::Process::exe_dir;

unshift @INC, "${exe_dir}/modules/override"; # Use our own versions of various modules (e.g. YAML).
push @INC, "${exe_dir}/modules/fallback"; # Only use our own versions of modules if there's no system version.
unshift @INC, $exe_dir;
}

use CGI qw( -no_xhtml);
use Config::Std;
use DateTime;
use Encode;
use English qw(-no_match_vars);
use File::Basename;
use List::MoreUtils qw(all);
use List::Util qw(first);
use POSIX;
use SL::Auth;
use SL::Dispatcher::AuthHandler;
use SL::LXDebug;
use SL::LxOfficeConf;
use SL::Locale;
use SL::Common;
use SL::Form;
use SL::Helper::DateTime;
use SL::InstanceConfiguration;
use SL::Template::Plugin::HTMLFixes;
use SL::Layout::None;

# Trailing new line is added so that Perl will not add the line
# number 'die' was called in.
use constant END_OF_REQUEST => "END-OF-REQUEST\n";

my %fcgi_file_cache;

sub new {
my ($class, $interface) = @_;

my $self = bless {}, $class;
$self->{interface} = lc($interface || 'cgi');
$self->{auth_handler} = SL::Dispatcher::AuthHandler->new;

return $self;
}

sub interface_type {
my ($self) = @_;
return $self->{interface} eq 'cgi' ? 'CGI' : 'FastCGI';
}

sub pre_request_checks {
_check_for_old_config_files();

if (!$::auth->session_tables_present) {
if ($::form->{script} eq 'admin.pl') {
::run();
::end_of_request();
} else {
show_error('login_screen/auth_db_unreachable');
}
}
}

sub show_error {
$::lxdebug->enter_sub;
my $template = shift;
my $error_type = shift || '';
my %params = @_;

$::myconfig{countrycode} = delete($params{countrycode}) || $::lx_office_conf{system}->{language};
$::locale = Locale->new($::myconfig{countrycode});
$::form->{error} = $::locale->text('The session is invalid or has expired.') if ($error_type eq 'session');
$::form->{error} = $::locale->text('Incorrect password!') if ($error_type eq 'password');

$::form->header(no_menu => 1);
print $::form->parse_html_template($template, \%params);
$::lxdebug->leave_sub;

::end_of_request();
}

sub pre_startup_setup {
my ($self) = @_;

SL::LxOfficeConf->read;

eval {
package main;
require "bin/mozilla/common.pl";
require "bin/mozilla/installationcheck.pl";
} or die $EVAL_ERROR;

# canonial globals. if it's not here, chances are it will get refactored someday.
{
no warnings 'once';
$::lxdebug = LXDebug->new;
$::auth = SL::Auth->new;
$::form = undef;
%::myconfig = ();
$::request = undef;
}

$SIG{__WARN__} = sub {
$::lxdebug->warn(@_);
};

$self->_cache_file_modification_times;
}

sub pre_startup_checks {
::verify_installation();
}

sub pre_startup {
my ($self) = @_;
$self->pre_startup_setup;
$self->pre_startup_checks;
}

sub require_main_code {
$::lxdebug->enter_sub;
my ($script, $suffix) = @_;

eval {
package main;
require "bin/mozilla/$script$suffix";
} or die $EVAL_ERROR;

if (-f "bin/mozilla/custom_$script$suffix") {
eval {
package main;
require "bin/mozilla/custom_$script$suffix";
};
$::form->error($EVAL_ERROR) if ($EVAL_ERROR);
}
if ($::form->{login} && -f "bin/mozilla/$::form->{login}_$script") {
eval {
package main;
require "bin/mozilla/$::form->{login}_$script";
};
$::form->error($EVAL_ERROR) if ($EVAL_ERROR);
}
$::lxdebug->leave_sub;
}

sub _require_controller {
my $controller = shift;
$controller =~ s|[^A-Za-z0-9_]||g;
$controller = "SL/Controller/${controller}";

eval {
package main;
require "${controller}.pm";
} or die $EVAL_ERROR;
}

sub _run_controller {
"SL::Controller::$_[0]"->new->_run_action($_[1]);
}

sub handle_request {
my $self = shift;
$self->{request} = shift;

$::lxdebug->enter_sub;
$::lxdebug->begin_request;

my ($script, $path, $suffix, $script_name, $action, $routing_type);

$self->unrequire_bin_mozilla;

$::locale = Locale->new($::lx_office_conf{system}->{language});
$::form = Form->new;
$::instance_conf = SL::InstanceConfiguration->new;
$::request = {
cgi => CGI->new({}),
layout => SL::Layout::None->new,
};

my $session_result = $::auth->restore_session;
$::auth->create_or_refresh_session;

$::form->read_cgi_input;

eval { ($routing_type, $script_name, $action) = _route_request($ENV{SCRIPT_NAME}); 1; } or return;

if ($routing_type eq 'old') {
$::form->{action} = lc $::form->{action};
$::form->{action} =~ s/( |-|,|\#)/_/g;

($script, $path, $suffix) = fileparse($script_name, ".pl");
require_main_code($script, $suffix);

$::form->{script} = $script . $suffix;

} else {
_require_controller($script_name);
$::form->{script} = "controller.pl";
}

eval {
pre_request_checks();

$::form->error($::locale->text('System currently down for maintenance!')) if -e ($::lx_office_conf{paths}->{userspath} . "/nologin") && $script ne 'admin';

# For compatibility with a lot of database upgrade scripts etc:
# Re-write request to old 'login.pl?action=login' to new
# 'LoginScreen' controller. Make sure to load its code!
if (($script eq 'login') && ($action eq 'login')) {
($routing_type, $script, $script_name, $action) = qw(controller controller LoginScreen login);
_require_controller('LoginScreen');
}

if (($script eq 'login') && !$action) {
print $::request->{cgi}->redirect('controller.pl?action=LoginScreen/user_login');

} elsif ($script eq 'admin') {
$::form->{titlebar} = "kivitendo " . $::locale->text('Version') . " $::form->{version}";
::run($session_result);

} else {
if (SL::Auth::SESSION_EXPIRED == $session_result) {
print $::request->{cgi}->redirect('controller.pl?action=LoginScreen/user_login&error=session');
::end_of_request();
}

my %auth_result = $self->{auth_handler}->handle(
routing_type => $routing_type,
script => $script,
controller => $script_name,
action => $action,
);

::end_of_request() unless $auth_result{auth_ok};

delete @{ $::form }{ grep { m/^\{AUTH\}/ } keys %{ $::form } } unless $auth_result{keep_auth_vars};

if ($action) {
$::instance_conf->init if $auth_result{auth_level} eq 'user';

map { $::form->{$_} = $::myconfig{$_} } qw(charset)
unless $action eq 'save' && $::form->{type} eq 'preferences';

$::form->set_standard_title;
if ($routing_type eq 'old') {
::call_sub('::' . $::locale->findsub($action));
} else {
_run_controller($script_name, $action);
}
} else {
$::form->error($::locale->text('action= not defined!'));
}
}

1;
} or do {
if ($EVAL_ERROR ne END_OF_REQUEST) {
print STDERR $EVAL_ERROR;
$::form->{label_error} = $::request->{cgi}->pre($EVAL_ERROR);
chdir SL::System::Process::exe_dir;
eval { show_error('generic/error') };
}
};

$::form->footer;

# cleanup
$::auth->save_session;
$::auth->expire_sessions;
$::auth->reset;

$::locale = undef;
$::form = undef;
$::myconfig = ();
$::request = undef;
Form::disconnect_standard_dbh;

$::lxdebug->end_request;

$self->_watch_for_changed_files;

$::lxdebug->leave_sub;
}

sub unrequire_bin_mozilla {
my $self = shift;
return unless $self->_interface_is_fcgi;

for (keys %INC) {
next unless m#^bin/mozilla/#;
next if /\bcommon.pl$/;
next if /\binstallationcheck.pl$/;
delete $INC{$_};
}
}

sub _interface_is_fcgi {
my $self = shift;
return $self->{interface} =~ m/^(?:fastcgi|fcgid|fcgi)$/;
}

sub _route_request {
my $script_name = shift;

return $script_name =~ m/dispatcher\.pl$/ ? ('old', _route_dispatcher_request())
: $script_name =~ m/controller\.pl/ ? ('controller', _route_controller_request())
: ('old', $script_name, $::form->{action});
}

sub _route_dispatcher_request {
my $name_re = qr{[a-z]\w*};
my ($script_name, $action);

eval {
die "Unroutable request -- inavlid module name.\n" if !$::form->{M} || ($::form->{M} !~ m/^${name_re}$/);
$script_name = $::form->{M} . '.pl';

if ($::form->{A}) {
$action = $::form->{A};

} else {
$action = first { m/^A_${name_re}$/ } keys %{ $::form };
die "Unroutable request -- inavlid action name.\n" if !$action;

delete $::form->{$action};
$action = substr $action, 2;
}

delete @{$::form}{qw(M A)};

1;
} or do {
$::form->{label_error} = $::request->{cgi}->pre($EVAL_ERROR);
show_error('generic/error');
};

return ($script_name, $action);
}

sub _route_controller_request {
my ($controller, $action);

eval {
$::form->{action} =~ m|^ ( [A-Z] [A-Za-z0-9_]* ) / ( [a-z] [a-z0-9_]* ) $|x || die "Unroutable request -- inavlid controller/action.\n";
($controller, $action) = ($1, $2);
delete $::form->{action};

1;
} or do {
$::form->{label_error} = $::request->{cgi}->pre($EVAL_ERROR);
show_error('generic/error');
};

return ($controller, $action);
}

sub _cache_file_modification_times {
my ($self) = @_;

return unless $self->_interface_is_fcgi && $::lx_office_conf{debug}->{restart_fcgi_process_on_changes};

require File::Find;
require POSIX;

my $wanted = sub {
return unless $File::Find::name =~ m/\.(?:pm|f?pl|html|conf|conf\.default)$/;
$fcgi_file_cache{ $File::Find::name } = (stat $File::Find::name)[9];
};

my $cwd = POSIX::getcwd();
File::Find::find($wanted, map { "${cwd}/${_}" } qw(config bin SL templates/webpages));
map { my $name = "${cwd}/${_}"; $fcgi_file_cache{$name} = (stat $name)[9] } qw(admin.pl dispatcher.fpl);
}

sub _watch_for_changed_files {
my ($self) = @_;

return unless $self->_interface_is_fcgi && $::lx_office_conf{debug}->{restart_fcgi_process_on_changes};

my $ok = all { (stat($_))[9] == $fcgi_file_cache{$_} } keys %fcgi_file_cache;
return if $ok;
$::lxdebug->message(LXDebug::DEBUG1(), "Program modifications detected. Restarting.");
exit;
}

sub get_standard_filehandles {
my $self = shift;

return $self->{interface} =~ m/f(?:ast)cgi/i ? $self->{request}->GetHandles() : (\*STDIN, \*STDOUT, \*STDERR);
}

sub _check_for_old_config_files {
my @old_files = grep { -f "config/${_}" } qw(authentication.pl console.conf lx-erp.conf lx-erp-local.conf);
return unless @old_files;

$::form->{title} = $::locale->text('Old configuration files');
$::form->header;
print $::form->parse_html_template('login_screen/old_configuration_files', { FILES => \@old_files });

::end_of_request();
}

package main;

use strict;

sub end_of_request {
die SL::Dispatcher->END_OF_REQUEST;
}

1;
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