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

namespace common\components;

use biz\platform\services\WxOpenService;
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($uniqueId)
	{
		$time = time();
		$signer = new Sha256();
		$salt = Yii::$app->params['secretKey'];
		$key = new Key($salt);
		$host = httpUtil::getHost();
		$sourceId = WxOpenService::getSourceId();
		$jwtId = $sourceId . '_' . $uniqueId;
		$token = (new Builder())->issuedBy($host)//发布者的url地址
		->canOnlyBeUsedBy($host)//接受者的url地址
		->identifiedBy($jwtId, 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 + 8640000)//该jwt销毁的时间
		->set('uniqueId', $uniqueId)//设置一个变量
		->sign($signer, $key)->getToken();
		
		$keyName = self::getKeyName($sourceId, $uniqueId);
		Yii::$app->redis->executeCommand('SET', [$keyName, $token]);
		
		return $token;
	}
	
	public static function getKeyName($sourceId, $uniqueId)
	{
		return 'JWT_' . $sourceId . '_' . $uniqueId;
	}
	
	//返回一个可用的token shish 2019.11.22
	public static function get($uniqueId)
	{
		//来源
		$sourceId = WxOpenService::getSourceId();
		$keyName = self::getKeyName($sourceId, $uniqueId);
		$cacheToken = Yii::$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)) {
			$token = self::create($uniqueId);
		}
		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)) {
			Yii::info('token时间验证没有通过。token:' . $token);
			return 0;
		}
		//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))) {
			Yii::info('token解密没有通过。token:' . $token);
			return 0;
		}
		$token->getHeaders(); // 获取JWT的Header(头部)信息
		$token->getClaims(); // 获取JWT的PayLoad(负载)信息
		$uniqueId = $token->getClaim('uniqueId');
		return $uniqueId;
	}
	
	//判断有没登陆并返回id shish 2019.11.22
	public static function getLoginId()
	{
		$header = httpUtil::getHeader();
		$token = isset($header['token']) ? $header['token'] : '';
		if (empty($token)) {
			return 0;
		}
		return self::validate($token);
	}
	
	public static function delToken($token, $uniqueId)
	{
		$sourceId = WxOpenService::getSourceId();
		$jwtId = $sourceId . '_' . $uniqueId;
		$host = httpUtil::getHost();
		$signer = new Sha256();//生成JWT时使用的加密方式
		$salt = Yii::$app->params['secretKey'];
		$signKey = new Key($salt);
		
		$token = (new Parser())->parse($token);
		//数据校验
		$data = new ValidationData();//使用当前时间来校验数据
		$data->setIssuer($host);
		$data->setAudience($host);
		$data->setId($jwtId);
		
		if (!$token->verify($signer, $signKey)) {
			Yii::info('token解密没有通过。token:' . $token);
			return false;
		}
		
		if (!$token->validate($data)) {
			Yii::info('token验证没有通过。token:' . $token);
			return false;
		}
		
		$token->getHeaders(); // 获取JWT的Header(头部)信息
		$token->getClaims(); // 获取JWT的PayLoad(负载)信息
		$returnId = $token->getClaim('uniqueId');
		if ($returnId != $uniqueId) {
			Yii::info('token验证出的id不是登陆用户id。token:' . $token);
			return false;
		}
		
		//设置为过期
		$data->setCurrentTime(time() + 600);
		
		return true;
	}
	
}