\tickyfilter

<?php

namespace ticky;

use ticky\helper\file;

class filter {

    // 全局过滤器
    public static function globals() {
        return self::handler('globals');
    }

    // 模块过滤器
    public static function module() {
        return self::handler('module');
    }

    // 控制器过滤器
    public static function controller($filter, array $only = [], array $except = []) {
        // 加载过滤器
        self::load($filter);
        // 拼装过滤器的命名空间
        $namespace = app::$namespace . '\\' . MODULE_NAME . '\\filter\\';
        // 拼装完整的过滤器类名
        $filter = $namespace . $filter;
        // 实例化过滤器
        $handler = new $filter();
        if (!method_exists($handler, 'run')) {
            throw new exception('Filter ' . $filter . ' must has run method');
        }
        if (array_filter($only) && !in_array(ACTION_NAME, $only)) {
            return true;
        } elseif (array_filter($except) && in_array(ACTION_NAME, $except)) {
            return true;
        }

        $result = $handler->run();
        if ($result !== true) {
            throw new exception($result);
        }
        return true;
    }

    // 加载过滤器
    private static function load($filter) {
        if (is_file($include = FILTER_PATH . DS . APP_ENV . DS . $filter . '.php')) {
            $file = $include;
        } elseif (is_file($include = FILTER_PATH . DS . $filter . '.php')) {
            $file = $include;
        } elseif (is_file($include = FILTER . DS . APP_ENV . DS . FILTER . '.php')) {
            $file = $include;
        } elseif (is_file($include = FILTER . DS . $filter . '.php')) {
            $file = $include;
        }
        return file::load($file);
    }

    private static function handler($type = 'module') {

        switch ($type) {
            case 'globals':
                $file = CONFIG . DS . 'filter.php';
                if (is_file($file)) {
                    $name = 'common';
                    $rule = config::get($file, 'rule');
                }
                break;
            case 'module':
                $file = CONFIG_PATH . DS . 'filter.php';
                if (is_file($file)) {
                    $name = MODULE_NAME;
                    $rule = config::get($file, 'rule');
                }
                break;
        }

        if (!isset($rule)) {
            return false;
        }

        // 拼装过滤器的命名空间
        $namespace = app::$namespace . "\\{$name}\\filter\\";
        $filters = explode(',', $rule);
        foreach ($filters as $filter) {
            $filter = $namespace . $filter;
            $handler = new $filter();
            if (!method_exists($handler, 'run')) {
                throw new exception('Filter ' . $filter . ' must has run method');
            }
            $result = $handler->run();
            if ($result !== true) {
                throw new exception($result);
            }
        }
        return true;
    }

}