<?php
namespace app\common;

use Firebase\JWT\JWT;
use think\Exception;

class Token
{
    private static $key = '@#$%^&*!';

    /**
     * @param $user
     * @return array
     */
    public static function getToken($user)
    {
        $accessToken = self::createAccessToken($user);
        $refreshToken = self::createRefreshToken($user);
        return [
            'access_token' => $accessToken,
            'refresh_token' => $refreshToken
        ];
    }

    /**
     * @param $user
     * @return string[]
     */
    public static function getClientToken($user)
    {
        $accessToken = self::createAccessToken($user);
        return [
            'access_token' => $accessToken,
        ];
    }

    /**
     * 刷新token
     * @return string[]
     * @throws Exception
     * @throws \think\db\exception\DataNotFoundException
     * @throws \think\db\exception\DbException
     * @throws \think\db\exception\ModelNotFoundException
     */
    public static function refreshToken($user)
    {
        $accessToken = self::createAccessToken($user);
        return [
            'access_token' => $accessToken,
        ];
    }

    /**
     * 创建token
     * @param $user
     * @return string
     */
    private static function createAccessToken($user)
    {
        $payload = [
            'iss' => 'tp6', //签发者
            'iat' => time(), //什么时候签发的
            'exp' => time() + 7200, //过期时间
            'user' => $user,
        ];
        $token = JWT::encode($payload, self::$key);
        return $token;
    }

    /**
     * 创建刷新token
     * @param $user
     * @return string
     */
    private static function createRefreshToken($user)
    {
        $payload = [
            'iss' => 'tp6', //签发者
            'iat' => time(), //什么时候签发的
            'user' => $user,
        ];
        $token = JWT::encode($payload, self::$key);
        return $token;
    }

    /**
     * 根据token获取用户信息
     * @param $token
     * @return mixed|string
     */
    public static function getTokenValue($token)
    {
        $secretKey = self::$key;
        $jwt = (array)JWT::decode($token, $secretKey, ['HS256']);
        return $jwt['user']??'';
    }
}