catalog/controller/tool/upload.php

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<?php
class ControllerToolUpload extends Controller {
	public function index() {
		$this->load->language('tool/upload');

		$json = array();

		if (!empty($this->request->files['file']['name']) && is_file($this->request->files['file']['tmp_name'])) {
			// Sanitize the filename
			$filename = basename(preg_replace('/[^a-zA-Z0-9\.\-\s+]/', '', html_entity_decode($this->request->files['file']['name'], ENT_QUOTES, 'UTF-8')));

			// Validate the filename length
			if ((utf8_strlen($filename) < 3) || (utf8_strlen($filename) > 64)) {
				$json['error'] = $this->language->get('error_filename');
			}

			// Allowed file extension types
			$allowed = array();

			$extension_allowed = preg_replace('~\r?\n~', "\n", $this->config->get('config_file_ext_allowed'));

			$filetypes = explode("\n", $extension_allowed);

			foreach ($filetypes as $filetype) {
				$allowed[] = trim($filetype);
			}

			if (!in_array(strtolower(substr(strrchr($filename, '.'), 1)), $allowed)) {
				$json['error'] = $this->language->get('error_filetype');
			}

			// Allowed file mime types
			$allowed = array();

			$mime_allowed = preg_replace('~\r?\n~', "\n", $this->config->get('config_file_mime_allowed'));

			$filetypes = explode("\n", $mime_allowed);

			foreach ($filetypes as $filetype) {
				$allowed[] = trim($filetype);
			}

			if (!in_array($this->request->files['file']['type'], $allowed)) {
				$json['error'] = $this->language->get('error_filetype');
			}

			// Return any upload error
			if ($this->request->files['file']['error'] != UPLOAD_ERR_OK) {
				$json['error'] = $this->language->get('error_upload_' . $this->request->files['file']['error']);
			}
		} else {
			$json['error'] = $this->language->get('error_upload');
		}

		if (!$json) {
			$file = $filename . '.' . token(32);

			move_uploaded_file($this->request->files['file']['tmp_name'], DIR_UPLOAD . $file);

			// Hide the uploaded file name so people can not link to it directly.