Fragen\GitHub_Updater\Rest_Update::process_request PHP Method

    public function process_request()
    {
        try {
            $show_updates = false;
            $json_encode_flags = 128;
            // 128 == JSON_PRETTY_PRINT
            if (defined('JSON_PRETTY_PRINT')) {
                $json_encode_flags = JSON_PRETTY_PRINT;
            }
            if (!isset($_REQUEST['key']) || $_REQUEST['key'] != get_site_option('github_updater_api_key')) {
                throw new \Exception('Bad api key.');
            }
            $tag = 'master';
            if (isset($_REQUEST['tag'])) {
                $tag = $_REQUEST['tag'];
            } elseif (isset($_REQUEST['committish'])) {
                $tag = $_REQUEST['committish'];
            }
            /**
             * Parse webhook response and convert 'tag' to 'committish'.
             * This will avoid potential race conditions.
             *
             * Throw Exception if `$_REQUEST['tag'] !== webhook branch` this avoids
             * unnecessary updates for PUSH to different branch.
             */
            $webhook_response = $this->get_webhook_data();
            if ($webhook_response) {
                if ($tag === $webhook_response['branch']) {
                    $tag = $webhook_response['hash'];
                } else {
                    throw new \Exception('Request tag and webhook are not matching.');
                }
            }
            if (isset($_REQUEST['plugin'])) {
                $this->update_plugin($_REQUEST['plugin'], $tag);
            } elseif (isset($_REQUEST['theme'])) {
                $this->update_theme($_REQUEST['theme'], $tag);
            } elseif (isset($_REQUEST['updates'])) {
                $show_updates = true;
            } else {
                throw new \Exception('No plugin or theme specified for update.');
            }
        } catch (\Exception $e) {
            http_response_code(500);
            header('Content-Type: application/json');
            echo json_encode(array('message' => $e->getMessage(), 'error' => true), $json_encode_flags);
            exit;
        }
        header('Content-Type: application/json');
        $response = array('messages' => $this->get_messages());
        if ($show_updates) {
            $response = $this->show_updates($response);
        }
        if ($this->is_error()) {
            $response['error'] = true;
            http_response_code(500);
        } else {
            $response['success'] = true;
        }
        echo json_encode($response, $json_encode_flags) . "\n";
        exit;
    }