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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')

use Carp;
use CGI qw( -no_xhtml);
use Config::Std;
use DateTime;
use Encode;
use English qw(-no_match_vars);
use FCGI;
use File::Basename;
use IO::File;
use List::MoreUtils qw(all);
use List::Util qw(first);
use POSIX qw(setlocale);
use SL::Auth;
use SL::Dispatcher::AuthHandler;
use SL::LXDebug;
use SL::LxOfficeConf;
use SL::Locale;
use SL::ClientJS;
use SL::Common;
use SL::Form;
use SL::Helper::DateTime;
use SL::InstanceConfiguration;
use SL::MoreCommon qw(uri_encode);
use SL::Template::Plugin::HTMLFixes;
use SL::User;

use Rose::Object::MakeMethods::Generic (
scalar => [ qw(restart_after_request) ],
);

# 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;

# Initialize character type locale to be UTF-8 instead of C:
foreach my $locale (qw(de_DE.UTF-8 en_US.UTF-8)) {
last if setlocale('LC_CTYPE', $locale);
}

return $self;
}

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

sub is_admin_request {
my %params = @_;
return ($params{script} eq 'admin.pl') || (($params{routing_type} eq 'controller') && ($params{script_name} eq 'Admin'));
}

sub pre_request_checks {
my (%params) = @_;

_check_for_old_config_files();

if (!$::auth->session_tables_present && !is_admin_request(%params)) {
show_error('login_screen/auth_db_unreachable');
}

if ($::request->type !~ m/^ (?: html | js | json ) $/x) {
die $::locale->text("Invalid request type '#1'", $::request->type);
}
}

sub pre_request_initialization {
my ($self, %params) = @_;

$self->unrequire_bin_mozilla;

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

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

if ($params{client}) {
$::auth->set_client($params{client}) || die("cannot find client " . $params{client});

if ($params{login}) {
die "cannot find user " . $params{login} unless %::myconfig = $::auth->read_user(login => $params{login});
die "cannot find locale for user " . $params{login} unless $::locale = Locale->new($::myconfig{countrycode});

$::form->{login} = $params{login}; # normaly implicit at login
}
}

return $session_result;
}

sub render_error_ajax {
my ($error) = @_;

SL::ClientJS->new
->error($error)
->render(SL::Controller::Base->new);
}

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->{error} = $::locale->text('The action is missing or invalid.') if ($error_type eq 'action');

return render_error_ajax($::form->{error}) if $::request->is_ajax;

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

end_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;
$::request = undef;
%::myconfig = User->get_default_myconfig;
}

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

$SIG{__DIE__} = sub { Carp::confess( @_ ) } if $::lx_office_conf{debug}->{backtrace_on_die};

$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_all_requests {
my ($self) = @_;

my $request = FCGI::Request();
while ($request->Accept() >= 0) {
$self->handle_request($request);

$self->restart_after_request(1) if $self->_interface_is_fcgi && SL::System::Process::memory_usage_is_too_high();
$request->LastCall if $self->restart_after_request;
}

exec $0 if $self->restart_after_request;
}

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

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

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

my $session_result = $self->pre_request_initialization;

$::request->read_cgi_input($::form);

my %routing;
eval { %routing = $self->_route_request($ENV{SCRIPT_NAME}); 1; } or return;
($routing_type, $script_name, $action) = @routing{qw(type controller action)};
$::lxdebug->log_request($routing_type, $script_name, $action);

$::request->type(lc($routing{request_type} || 'html'));

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) unless $script eq 'admin';

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

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

eval {
pre_request_checks(script => $script, action => $action, routing_type => $routing_type, script_name => $script_name);

if ( SL::System::InstallationLock->is_locked
&& !is_admin_request(script => $script, script_name => $script_name, routing_type => $routing_type)) {
$::form->error($::locale->text('System currently down for maintenance!'));
}

# 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)
|| ($script eq 'admin')
|| (SL::Auth::SESSION_EXPIRED() == $session_result)) {
$self->handle_login_error(routing_type => $routing_type,
script => $script,
controller => $script_name,
action => $action,
error => 'session');
}

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

$self->end_request unless $auth_result{auth_ok};

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

if ($action) {
$::form->set_standard_title;
if ($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 (substr($EVAL_ERROR, 0, length(END_OF_REQUEST())) ne END_OF_REQUEST()) {
my $error = $EVAL_ERROR;
print STDERR $error;

if ($::request->is_ajax) {
eval { render_error_ajax($error) };
} else {
$::form->{label_error} = $::request->{cgi}->pre($error);
chdir SL::System::Process::exe_dir;
eval { show_error('generic/error') };
}
}
};

$::form->footer;

if ($self->_interface_is_fcgi) {
# fcgi? send send reponse on its way before cleanup.
$self->{request}->Flush;
$self->{request}->Finish;
}

$::lxdebug->end_request(routing_type => $routing_type, script_name => $script_name, action => $action);

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

$::locale = undef;
$::form = undef;
%::myconfig = ();
$::request = undef;

SL::DBConnect::Cache->reset_all;

$self->_watch_for_changed_files;

$::lxdebug->leave_sub;
}

sub reply_with_json_error {
my ($self, %params) = @_;

my %errors = (
session => { code => '401 Unauthorized', text => 'session expired' },
password => { code => '401 Unauthorized', text => 'incorrect username or password' },
action => { code => '400 Bad request', text => 'incorrect or missing action' },
access => { code => '403 Forbidden', text => 'no permissions for accessing this function' },
_default => { code => '500 Internal server error', text => 'general server-side error' },
);

my $error = $errors{$params{error}} // $errors{_default};
my $reply = SL::JSON::to_json({ status => 'failed', error => $error->{text} });

print $::request->cgi->header(
-type => 'application/json',
-charset => 'utf-8',
-status => $error->{code},
);

print $reply;

$self->end_request;
}

sub handle_login_error {
my ($self, %params) = @_;

return $self->reply_with_json_error(error => $params{error}) if $::request->type eq 'json';

my $action = ($params{script} // '') =~ m/^admin/i ? 'Admin/login' : 'LoginScreen/user_login';
$action .= '&error=' . $params{error} if $params{error};

my $redirect_url = "controller.pl?action=${action}";

if ( $action =~ m/LoginScreen\/user_login/
&& $params{action}
&& 'get' eq lc($ENV{REQUEST_METHOD})
&& !_is_callback_blacklisted(map {$_ => $params{$_}} qw(routing_type script controller action) )
) {

require SL::Controller::Base;
my $controller = SL::Controller::Base->new;

delete $params{error};
delete $params{routing_type};
delete @{ $::form }{ grep { m/^\{AUTH\}/ } keys %{ $::form } };

my $callback = $controller->url_for(%params, %{$::form});
$redirect_url .= '&callback=' . uri_encode($callback);
}

print $::request->cgi->redirect($redirect_url);
$self->end_request;
}

sub _is_callback_blacklisted {
my (%params) = @_;

# You can give a name only, then all actions are blackisted.
# Or you can give name and action, then only this action is blacklisted
# examples:
# {name => 'is', action => 'edit'}
# {name => 'Project', action => 'edit'},
my @script_blacklist = (
{name => 'admin'},
{name => 'login'},
);

my @controller_blacklist = (
{name => 'Admin'},
{name => 'LoginScreen'},
);

my ($name, $blacklist);
if ('old' eq ($params{routing_type} // '')) {
$name = $params{script};
$blacklist = \@script_blacklist;
} else {
$name = $params{controller};
$blacklist = \@controller_blacklist;
}

foreach my $bl (@$blacklist) {
return 1 if _is_name_action_blacklisted($bl->{name}, $bl->{action}, $name, $params{action});
}

return;
}

sub _is_name_action_blacklisted {
my ($blacklisted_name, $blacklisted_action, $name, $action) = @_;

return 1 if ($name // '') eq $blacklisted_name && !$blacklisted_action;
return 1 if ($name // '') eq $blacklisted_name && ($action // '') eq $blacklisted_action;
return;
}

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 ($self, $script_name) = @_;

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

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

eval {
die "Unroutable request -- invalid 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 %{ $::form };
die "Unroutable request -- invalid action name.\n" if !$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 (controller => $script_name, action => $action);
}

sub _route_controller_request {
my ($self) = @_;
my ($controller, $action, $request_type);

eval {
# Redirect simple requests to controller.pl without any GET/POST
# param to the login page.
$self->handle_login_error(error => 'action') if !$::form->{action};

# Show an error if the »action« parameter doesn't match the
# pattern »Controller/action«.
$::form->{action} =~ m|^ ( [A-Z] [A-Za-z0-9_]* ) / ( [a-z] [a-z0-9_]* ) ( \. [a-zA-Z]+ )? $|x || die "Unroutable request -- invalid controller/action.\n";
($controller, $action) = ($1, $2);
delete $::form->{action};

$request_type = $3 ? lc(substr($3, 1)) : 'html';

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

return (controller => $controller, action => $action, request_type => $request_type);
}

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.");
$self->restart_after_request(1);
}

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_request();
}

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

1;
(26-26/82)