<?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() {
		$users = array (
				// username => password
				'demo' => 'demo',
				'admin' => 'admin' 
		);
		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;
	}
}