<?php
/**
 * User: shish
 * Date: 2019/11/20
 * Time: 23:21
 */

namespace common\components;

use Lcobucci\JWT\Builder;
use Lcobucci\JWT\Parser;
use Lcobucci\JWT\ValidationData;
use Lcobucci\JWT\Signer\Key;
use Lcobucci\JWT\Signer\Hmac\Sha256;
use Yii;

class jwt
{
	
	//生成token
	public static function create($sourceId, $userId)
	{
		$time = time();
		$signer = new Sha256();
		$salt = Yii::$app->params['secretKey'];
		$key = new Key($salt);
		$host = httpUtil::getHost();
		$uniqueId = $sourceId . '_' . $userId;
		$token = (new Builder())->issuedBy($host)//发布者的url地址
		->canOnlyBeUsedBy($host)//接受者的url地址
		->identifiedBy($uniqueId, true)//该jwt的唯一ID编号
		->issuedAt($time)//该jwt的发布时间
		->canOnlyBeUsedAfter($time)//该jwt的使用时间不能早于该时间
		->expiresAt($time + 3600)//该jwt销毁的时间
		->set('userId', $userId)//设置一个变量
		->sign($signer, $key)->getToken();
		
		$keyName = self::getKeyName($sourceId, $userId);
		Yii::$app->redis->executeCommand('SET', [$keyName, $token]);
		
		return $token;
	}
	
	public static function getKeyName($sourceId, $userId)
	{
		return 'JWT_' . $sourceId . '_' . $userId;
	}
	
	//返回一个可用的token shish 2019.11.22
	public static function get($sourceId, $userId)
	{
		$keyName = self::getKeyName($sourceId, $userId);
		$cacheToken = Yii::$app->redis->executeCommand('GET', [$keyName]);
		$token = '';
		//从缓存中获取
		if (!empty($cacheToken)) {
			$tokenResource = (new Parser())->parse((string)$cacheToken);
			$data = new ValidationData();
			$r = $tokenResource->validate($data);
			$token = $r == false ? '' : $cacheToken;
		}
		if (empty($token)) {
			$token = self::create($sourceId, $userId);
		}
		return $token;
	}
	
	//验证token
	public static function validate($token)
	{
		$token = (new Parser())->parse($token);
		//数据校验
		$data = new ValidationData(); // 使用当前时间来校验数据
		if (!$token->validate($data)) {
			return ['code' => 1];
		}
		//token校验
		$signer = new Sha256();//生成JWT时使用的加密方式
		$salt = Yii::$app->params['secretKey'];
		if (!$token->verify($signer, new Key($salt))) {
			return ['code' => 1];
		}
		$token->getHeaders(); // 获取JWT的Header(头部)信息
		$token->getClaims(); // 获取JWT的PayLoad(负载)信息
		$userId = $token->getClaim('userId');
		return ['code' => 0, 'data' => ['userId' => $userId]];
	}
	
}