最近一个YII2的项目正好需要实现SSO, 可是在网上搜了半天没有找到一个解决方案. 于是研究了一下源代码.
其实在Yii2只需要配置 config就能实现.
在config 头加上domain信息

$host = explode('.', $_SERVER["HTTP_HOST"]);
if (count($host) > 2) {
    define('DOMAIN', $host[1] . '.' . $host[2]);
} else {
    define('DOMAIN', $host[0] . '.' . $host[1]);
}
define('DOMAIN_HOME', 'www.' . DOMAIN);
define('DOMAIN_USER_CENTER', 'man.' . DOMAIN);
define('DOMAIN_API', 'api.' . DOMAIN);
define('DOMAIN_EMAIL', 'mail.' . DOMAIN);
define('DOMAIN_LOGIN', 'login.' . DOMAIN);
define('DOMAIN_IMG', 'img.' . DOMAIN);
然后配置User 和 Session:

'user' => [
    'enableAutoLogin' => true,
    'identityCookie' => ['name' => '_identity', 'httpOnly' => true, 'domain' => '.' . DOMAIN],
],
'session' => [
    'cookieParams' => ['domain' => '.' . DOMAIN, 'lifetime' => 0],
    'timeout' => 3600,
],
这样单点登陆基本实现, 从login.xxx.com 登陆后, 去到www.xxx.com session 依然有效果.
另外, 我修改了 urlManager, 使之可以生成其它domain的URL.


'urlManager' => [
    'class' => 'common\components\MutilpleDomainUrlManager',
    'domains' => [
        'man' => '//' . DOMAIN_USER_CENTER,
        'mail' => '//' . DOMAIN_EMAIL,
        'img' => '//' . DOMAIN_IMG,
        'api' => '//' . DOMAIN_API,
        'login' => '//' . DOMAIN_LOGIN,
    ],
    'baseUrl' => '//' . DOMAIN_HOME,   # Default BaseUrl
    'showScriptName' => false,
    'enablePrettyUrl' => true,
],
MutilpleDomainUrlManager.php
 

namespace common\components;
 
use Yii;
 
class MutilpleDomainUrlManager extends \yii\web\UrlManager
{
    public $domains = array();
 
    public function createUrl($domain, $params = array()) {
        if (func_num_args() === 1) {
            $params = $domain;
            $domain = false;
        }
        $bak = $this->getBaseUrl();
        if ($domain) {
            if (!isset($this->domains[$domain])) {
                throw new \yii\base\InvalidConfigException('Please configure UrlManager of domain "' . $domain . '".');
            }
            $this->setBaseUrl($this->domains[$domain]);
        }
        $url = parent::createUrl($params);
        $this->setBaseUrl($bak);
        return $url;
    }
}
这样我们可以使用以下代码生成其它domain url
 

Yii::$app->urlManager->createUrl('site/index'),   # www.xxx.com/site/index
Yii::$app->urlManager->createUrl('login', 'site/login'),  #  login.xxx.com/site/login
Yii::$app->urlManager->createUrl('article/list'),  #  login.xxx.com/article/list
Yii::$app->urlManager->createUrl('man', 'user/view'),  #  man.xxx.com/user/view