admin/controller/common/login.php

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<?php
class ControllerCommonLogin extends Controller {
	private $error = array();

	public function index() {
		$this->load->language('common/login');

		$this->document->setTitle($this->language->get('heading_title'));

		if ($this->user->isLogged() && isset($this->request->get['user_token']) && ($this->request->get['user_token'] == $this->session->data['user_token'])) {
			$this->response->redirect($this->url->link('common/dashboard', 'user_token=' . $this->session->data['user_token']));
		}

		if (($this->request->server['REQUEST_METHOD'] == 'POST') && $this->validate()) {
			$this->session->data['user_token'] = token(32);
			
			if (isset($this->request->post['redirect']) && (strpos($this->request->post['redirect'], HTTP_SERVER) === 0)) {
				$this->response->redirect($this->request->post['redirect'] . '&user_token=' . $this->session->data['user_token']);
			} else {
				$this->response->redirect($this->url->link('common/dashboard', 'user_token=' . $this->session->data['user_token']));
			}
		}

		if ((isset($this->session->data['user_token']) && !isset($this->request->get['user_token'])) || ((isset($this->request->get['user_token']) && (isset($this->session->data['user_token']) && ($this->request->get['user_token'] != $this->session->data['user_token']))))) {
			$this->error['warning'] = $this->language->get('error_token');
		} elseif (isset($this->error['warning'])) {
			$data['error_warning'] = $this->error['warning'];
		} elseif (isset($this->session->data['error'])) {
			$data['error_warning'] = $this->session->data['error'];

			unset($this->session->data['error']);
		} else {
			$data['error_warning'] = '';
		}

		if (isset($this->session->data['success'])) {
			$data['success'] = $this->session->data['success'];

			unset($this->session->data['success']);
		} else {
			$data['success'] = '';
		}

		$data['action'] = $this->url->link('common/login');

		if (isset($this->request->post['username'])) {
			$data['username'] = $this->request->post['username'];
		} else {
			$data['username'] = '';
		}

		if (isset($this->request->post['password'])) {
			$data['password'] = $this->request->post['password'];
		} else {
			$data['password'] = '';
		}

		if (isset($this->request->get['route'])) {
			$route = $this->request->get['route'];