Yii2 SaaS Authentication - database

Question

I'm Developing SaaS application using Yii2 with separate DB architecture. I have a problem in login to system by using tenant database.
I need to get tenant database details from common db and establish tenant db connection after entering company id, username and password in login form.
This is my index.php file.
<?php
defined('YII_DEBUG') or define('YII_DEBUG', true);
defined('YII_ENV') or define('YII_ENV', 'dev');
require(__DIR__ . '/_protected/vendor/autoload.php');
require(__DIR__ . '/_protected/vendor/yiisoft/yii2/Yii.php');
$config = require(__DIR__ . '/_protected/config/web.php');
(new yii\web\Application($config));
if (Yii::$app->session->get('company')) :
$appConnection = \app\models\Userdbconnections::find()->where(['company_id' => Yii::$app->session->get('company')])->one();
\Yii::$app->dbDynamic->dsn = "mysql:host=localhost;dbname=$appConnection->dns";
\Yii::$app->dbDynamic->username = $appConnection->user;
\Yii::$app->dbDynamic->password = $appConnection->password;
\Yii::$app->dbDynamic->charset = 'utf8';
endif;
Yii::$app->run(); // this will run the application
?>
From login function after post logging data, auth controller is like this
if ( Yii::$app->request->post() ){
$connection = \app\models\Userdbconnections::find()->where(['company_id'=>Yii::$app->request->post('LoginForm')['company']])->one();
$_SESSION["dsn"] = $connection->dns;
$_SESSION["user"] = $connection->user;
$_SESSION["pass"] = $connection->password;
$_SESSION["company_id"] = $connection->company_id;
// Yii::$app->db()->close();
Yii::$app->set('db', [
'class' => '\yii\db\Connection',
'dsn' => "mysql:host=localhost;dbname={$connection->dns}",
'username' => $connection->user,
'password' => $connection->password,
]);
$model_db = new LoginForm();
$model_db->load(Yii::$app->request->post());
$model_db->login();
$_SESSION["login_user"] = $model_db->username;
}
User Management Module called in web.php under component part as following
'user' => [
'class' => 'webvimark\modules\UserManagement\components\UserConfig',
// Comment this if you don't want to record user logins
'on afterLogin' => function($event) {
\webvimark\modules\UserManagement\models\UserVisitLog::newVisitor($event->identity->id);
},
'enableSession' =>true,
],
Each model file consist with following code
public static function getDb()
{
return Yii::$app->get('dbDynamic');
}
So now i'm able to log from tenant db. But after checking i noticed User Management part, creation, role creation all these linked to common db when ever i logged in to tenant db. Is there anything I misses in here?

Answer 1

One way to do it is having two connections. One connection for common details coming from common database (user details, tenant db he belongs to, et al). This connection is static, so must be defined in the config (or just rename what comes with Yii Basic app to something like commonDb or use it with just db name.
Another one will be connected to the specific user tenant database. This will be dynamic and details must change. There are many ways to do it. One is to defined it before app runs. See this forum post for details. Another would be setting it up before request using Yii Container and call it inside your models et al. There might be other ways too.
So the process goes like this
User logs in. Connection used is the common connection (let it be defined as Yii::$app->db).
Using details from (1) create the dynamic connection.
Use the connections where needed (in models, Active data providers or Query builders)
Here is untested example
//common database with user login
----------------------------------
| id | name | tenant_database |
----------------------------------
| 1 | Stef | company_a |
----------------------------------
Note here that Yii::$app->user->identity will hold model class that wraps this table
//config/web.php
return [
'components' =>[
'db' => [
'class' => 'yii\db\Connection',
'dsn' => 'mysql:host=localhost;dbname=common_db',
'username' => 'username',
'password' => 'password',
'charset' => 'utf8',
]
'userDb' => [
'class' => 'yii\db\Connection',
'dsn' => 'mysql:host=localhost;dbname=${database}',
'username' => 'username',
'password' => 'password',
'charset' => 'utf8',
]
]
//set it up before request
'on beforeRequest' => function ($event) {
if(Yii::$app->user->isGuest)
{
// redirect user to Login page
}
else
{
$currentDSN = Yii::$app->userDb->dsn;
$tenantDB = Yii::$app->user->identity->tenant_database;
Yii::$app->userDb->dsn = str_replace('${database}', $tenantDB, $currentDSN);
}
},
]
Then in model class override getDb as follows
class Data extends \yii\db\ActiveRecord
{
public static function getDb()
{
return Yii::$app->userDb;
}
}
Then user it as in:
$data = Data::find()->all();
$data = Yii::$app->userDb->createCommand('SELECT * FROM data')->queryAll();
UPDATE
Since OP wants the data to be in tenant db, the only way is having each tenant to have special Tenant Code, and on login page you will provide inputs for Tenant Code, Username and Password. Then
1. Query the common table for the database name associated with that code
2. Change Connection details as shown above
3. Login with TenantLogin class that uses tenant connection as shown above with Data class.
The new common table
----------------------------
| code | tenant_database |
----------------------------
| 12333 | company_a |
----------------------------