public function contributorUpload()
    {
        if (!($contact = $this->getActiveUser())) {
            throw new Exception\CoreException(
                'invalid user',
                'this action requires an authenticated user',
                401,
                \Phalcon\Logger::ERROR
            );
        }

        if (!($hf = $contact->getContributorHotFolder())) {
            $errors = $contact->getMessagesAsArray();

            throw new Exception\CoreException(
                'forbidden',
                $errors[0],
                403,
                \Phalcon\Logger::ERROR,
                "contact `{$contact->idcontacts}`, ".implode('; ', $errors)
            );
        }

        $myHotfolder = realpath($this->settings['coo']['contributorHotfolderRoot'] . $hf) . DIRECTORY_SEPARATOR;

        if ($myHotfolder == false) {
            throw new Exception\CoreException(
                'internal server error',
                'upload folder is currently unavailable',
                500,
                \Phalcon\Logger::ERROR,
                "contact `{$contact->idcontacts}`, missing upload hotfolder `{$this->settings['coo']['contributorHotfolderRoot']}{$hf}`"
            );
        }

        if (($files = $this->getRequestFiles()) === false) {
            throw new Exception\CoreException(
                'file upload failed',
                $this->getMessages()[0],
                500,
                \Phalcon\Logger::ERROR,
                implode('; ', $this->getMessages())
            );
        }

        $errors = $this->getMessages();

        foreach ($files as $file) {
            $cleanName = General\Utils::normalizeChars($file['name']);
            $hotName = $myHotfolder . $cleanName;

            if (file_exists($hotName)) {
                $dupeName = rtrim($hotName, ".{$file['extn']}");
                $dupeCount = count(glob($dupeName . '*'));

                $hotName = $dupeName . '_' . ++$dupeCount . '.' . $file['extn'];
            }

            $this->logger->debug(__METHOD__.'|'.__LINE__."|file `{$file['name']}`; clean `{$cleanName}`; hot `{$hotName}`");

            if (!rename($file['tempfile'], $hotName)) {
                $errors[] = "failed to upload `{$file['name']}`";
                $this->logger->error(__METHOD__.'|'.__LINE__."|failed to upload `{$file['name']}`" . error_get_last()['message']);
                @unlink($file['tempfile']);
            }
        }