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www.mikescher.com/www/protected/components/UserIdentity.php

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<?php
/**
* UserIdentity represents the data needed to identity a user.
* It contains the authentication method that checks if the provided
* data can identity the user.
*/
class UserIdentity extends CUserIdentity
{
/**
* Authenticates a user.
* The example implementation makes sure if the username and password
* are both 'demo'.
* In practical applications, this should be changed to authenticate
* against some persistent user identity storage (e.g. database).
* @return boolean whether authentication succeeds.
*/
public function authenticate()
{
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$connection = Yii::app()->db;
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$command=$connection->createCommand("SELECT SValue FROM {{othervalues}} WHERE Name = 'AdminPassword'");
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$pw = $command->queryScalar();
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$users=array(
// username => password
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'admin' => $pw,
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);
if(!isset($users[$this->username]))
$this->errorCode=self::ERROR_USERNAME_INVALID;
elseif($users[$this->username]!==$this->password)
$this->errorCode=self::ERROR_PASSWORD_INVALID;
else
$this->errorCode=self::ERROR_NONE;
return !$this->errorCode;
}
}