<?php
/**
 * 重庆赤晓店信息科技有限公司
 * https://www.chixiaodian.com
 * Copyright (c) 2023 赤店商城 All rights reserved.
 */
namespace app\librarys;

use yii\base\Component;
use Yii;
use Exception;
use InvalidArgumentException;
use app\models\Admin;
use app\models\User;
use app\models\SaasUser;

/**
 * Class JwtComponent
 * @package app\librarys
 */
class JwtComponent extends Component
{
    /**
     * 签名算法常量
     */
    const ALGORITHM_HS256 = 'HS256';
    const ALGORITHM_HS384 = 'HS384';
    const ALGORITHM_HS512 = 'HS512';
    const ALGORITHM_RS256 = 'RS256';
    const ALGORITHM_RS384 = 'RS384';
    const ALGORITHM_RS512 = 'RS512';

    /**
     * 密钥
     * @var string
     */
    public $key = '';

    /**
     * 私钥
     * @var string
     */
    public $privateKey = '';

    /**
     * 公钥
     * @var string
     */
    public $publicKey = '';

    /**
     * @var string
     */
    public $headerKey = 'Authorization';

    /**
     * 偏移时间，秒
     * @var int
     */
    public $leeway = 0;

    /**
     * 签名算法
     * @var string
     */
    public $algorithm = self::ALGORITHM_HS256;

    private $admin = null;

    private $user = null;

    private $saasUser = null;

    /**
     * Jwt constructor.
     * @param array $config
     */
    public function __construct($config = [])
    {
        \Firebase\JWT\JWT::$leeway = $this->leeway;
        parent::__construct($config);
    }

    /**
     * 获取有效载荷
     * @return array
     * @throws Exception
     */
    public function getPayload()
    {
        $headers = Yii::$app->getRequest()->getHeaders();
        if ($headers->has($this->headerKey)) {
            $authorization = $headers->get($this->headerKey);
            if (strpos($authorization, 'Bearer ') === 0) {
                $token = (string) substr($authorization, 7);
                return $this->parse($token);
            }
        }
        throw new Exception('提取Token失败.');
    }

    /**
     * 解析token
     * @param string $token
     * @return array
     */
    public function parse(string $token)
    {
        switch ($this->algorithm) {
            case self::ALGORITHM_HS256:
            case self::ALGORITHM_HS384:
            case self::ALGORITHM_HS512:
                return (array) \Firebase\JWT\JWT::decode($token, $this->key, [$this->algorithm]);
                break;
            case self::ALGORITHM_RS256:
            case self::ALGORITHM_RS384:
            case self::ALGORITHM_RS512:
                return (array) \Firebase\JWT\JWT::decode($token, $this->publicKey, [$this->algorithm]);
                break;
            default:
                throw new InvalidArgumentException('无效的签名算法.');
        }
    }

    /**
     * 创建token
     * @param array $payload
     * @return string
     */
    public function createToken(array $payload)
    {
        switch ($this->algorithm) {
            case self::ALGORITHM_HS256:
            case self::ALGORITHM_HS384:
            case self::ALGORITHM_HS512:
                return \Firebase\JWT\JWT::encode($payload, $this->key, $this->algorithm);
                break;
            case self::ALGORITHM_RS256:
            case self::ALGORITHM_RS384:
            case self::ALGORITHM_RS512:
                return \Firebase\JWT\JWT::encode($payload, $this->privateKey, $this->algorithm);
                break;
            default:
                throw new InvalidArgumentException('无效的签名算法.');
        }
    }

    /**
     * @param Admin $admin
     */
    public function setAdmin(Admin $admin)
    {
        $this->admin = $admin;
    }

    /**
     * @return Admin|null
     */
    public function getAdmin()
    {
        return $this->admin;
    }
    /**
     * @param User $user
     */
    public function setUser(User $user)
    {
        $this->user = $user;
    }

    /**
     * @return User|null
     */
    public function getUser()
    {
        return $this->user;
    }

    /**
     * @param SaasUser $saasUser
     */
    public function setSaasUser(SaasUser $user)
    {
        $this->saasUser = $user;
    }

    /**
     * @return SaasUser|null
     */
    public function getSaasUser()
    {
        return $this->saasUser;
    }
}