API安全验证之JWT(JSON WEB TOKEN) OLCMS

假如www.olcms.com/getUserInfo获取用户信息,你怎么知道当前用户是谁?有人说登陆时候我把他UID写入session了,如果是API接口,没有session怎么办,那么就需要把UID带到参数里面,如果直接带里面,安全怎么办?所以我们需要加密成别人看不懂的字符串,这就是JWT(JSON WEB TOKEN),你可以把它理解为微信SDK中的access token(其实本身就是一样的东西).JWT加密和解密你自己写也行,不过没有必要重复造轮子,我们在github上搜一下jwt,我搜到一个lcobucci/jwt,看起来用的人也挺多,好,下来我们大概用tp来演示下

下载tp3.2.3

安装lcobucci/jwt

新建composer.json

    {
    "name": "olcms jwt demo",
    "description": "just a jwt demo with tp",
    "type": "demo",
    "keywords": ["jwt","tp"],
    "homepage": "https://www.olcms.com/",
    "license": "Apache2",
    "authors": [
        {
            "name": "olcms",
            "email": "admin@olcms.com"
        }
    ],
    "require": {
        "lcobucci/jwt" : "*"
    }
}

composer update composer安装看 https://www.olcms.com/2015

打开index.php,在载入tp前载入comoposer的自动加载

//composer
require 'vendor/autoload.php';

// 引入ThinkPHP入口文件
require './ThinkPHP/ThinkPHP.php';

生成和使用jwt

IndexController.class.php

namespace HomeController;

use ThinkController;
use LcobucciJWTBuilder;

class IndexController extends Controller {

    public function index(){
        $token = (new Builder())
                        ->set('uid', 1) // Configures a new claim, called "uid"
                        ->getToken(); // Retrieves the generated token
        echo $token; // The string representation of the object is a JWT string (pretty easy, right?)
    }

}

浏览器访问,我们看到生成的jwteyJ0eXAiOiJKV1QiLCJhbGciOiJub25lIn0.eyJ1aWQiOjF9.刷新一下,发现什么?没变,恩，不够安全，我们再修改下代码

namespace HomeController;

use ThinkController;
use LcobucciJWTBuilder;
use LcobucciJWTSignerHmacSha256;

class IndexController extends Controller {

    public function index(){
        $signer = new Sha256();
        $token = (new Builder())
                        ->set('uid', 1) // Configures a new claim, called "uid"
                        ->setExpiration(time() + 3600)
                        ->sign($signer, 'olcms') // creates a signature using "testing" as key
                        ->getToken(); // Retrieves the generated token
        echo $token; // The string representation of the object is a JWT string (pretty easy, right?)
    }

}

生成的jwteyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJ1aWQiOjEsImV4cCI6MTQ2MDYwNjk0Mn0.GdbEXStqQR-5zofQVmorrB4U3yuyCYDdX-jFu58dPpY每次刷新也变- -

从jwt中获取信息

namespace HomeController;

use ThinkController;
use LcobucciJWTBuilder;
use LcobucciJWTSignerHmacSha256;
use LcobucciJWTParser;

class IndexController extends Controller {

    public function index(){
        $signer = new Sha256();
        $token = (new Builder())
                        ->set('uid', 1) // Configures a new claim, called "uid"
                        ->setExpiration(time() + 3600)
                        ->sign($signer, 'olcms') // creates a signature using "testing" as key
                        ->getToken(); // Retrieves the generated token
        echo $token; // The string representation of the object is a JWT string (pretty easy, right?)

        //从jwt获取信息
        $token = (new Parser())->parse((string) $token); // Parses from a string
        echo $token->getClaim('uid'); // will print "1"
    }

}

大概逻辑

用户登录,服务器生成jwt,放入memcache等缓存并返回jwt,client所有请求都必须带jwt