OpenID with PHP

Jun 23, 2016 pm 02:36 PM

AVBlog2.0开发手记之一

打酱油先

OpenID已经不算是新鲜事物了,不过至今仍然是处于叫好不叫座的尴尬状态。推广的策略是一方面,从用户体验的角度来看,登录过程中会有可能跳转到OpenID网站,这是对已经习惯了普通注册登录流程的用户一个极大的考验。所以像Facebook Connect这样更简洁的应用反而更容易获得市场。也许OpenID想要获得广泛应用还需要不少改进之处,但OpenID的理念,毫无疑问会在未来大放异彩。

不过这些和本次的Blog并无太大关系,我只是出来打酱油的:P

想要让自己的网站支持OpenID,门槛并不算高,以下以PHP为例,记述PHP环境下OpenID登录过程的开发。

准备工作

OpenID的通讯过程已经有很多库封装好了,在OpenID Wiki里可以看到不少PHP类库,本次我们选择JanRain的OpenID Enabled。

最新的版本是Version 2.1.2,基于OpenID2.0协议,下载到本地后直接运行examples文件夹里的detect.php,可以根据提示调整开发环境,最低限度需要PHP的PEAR支持。具体情况可以根据提示灵活处理,环境调整的工作这里一笔带过。

运行Demo

客户端登录,已经有现成的Demo可供参考,运行examples/consumer/index.php,输入我们想要验证的OpenID然后提交,Win32环境下会很不幸的出现无法创建/tmp/_php_consumer_test的错误。这是为了保存登录过程中的临时文件,修改examples/consumer/common.php第53行,改为相对目录。

    $store_path = "./_php_consumer_test";
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重新运行Demo,仍然报错

Fatal error: Define Auth_OpenID_RAND_SOURCE as null to continue with an insecure random number generator.

在Auth\OpenID\CryptUtil.php的第23行,这里定义了Auth_OpenID_RAND_SOURCE会通过一个特定文件用来生成随机数,这里可以指定本机的一个文件,也可以直接定义为null

define('Auth_OpenID_RAND_SOURCE', null);
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至此如果运行环境没有问题的话,客户端登录的Demo已经可以成功运行了。

数据库模式运行

上面的例子采用了文件的方式保存登录过程中的临时文件,OpenID Enabled同时也提供了数据库方式的存储,数据库连接部分是基于PEAR的DB类实现。以Mysql为例,修改examples/consumer/index.php的getStore函数如下

function getStore() {require_once "Auth/OpenID/MySQLStore.php";$db =& DB::connect(array('phptype'  => 'mysql','username' => 'root','password' => 'root','hostspec' => 'localhost','database' => 'blog'));    $store = new Auth_OpenID_MySQLStore($db);    $store->createTables();    return $store;}
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