laravel/laravel/auth/drivers/eloquent.php

<?php namespace Laravel\Auth\Drivers; use Laravel\Hash, Laravel\Config;

class Eloquent extends Driver {

	/**
	 * Get the current user of the application.
	 *
	 * If the user is a guest, null should be returned.
	 *
	 * @param  int         $id
	 * @return mixed|null
	 */
	public function retrieve($id)
	{
		if (filter_var($id, FILTER_VALIDATE_INT) !== false)
		{
			return $this->model()->find($id);
		}
	}

	/**
	 * Attempt to log a user into the application.
	 *
	 * @param  array  $arguments
	 * @return void
	 */
	public function attempt($arguments = array())
	{
		$user = $this->model()->where(function($query) use($arguments) {
			$username = Config::get('auth.username');
			
			$query->where($username, '=', $arguments['username']);

			foreach( array_except($arguments, array('username', 'password')) as $column => $val )
			{
			    $query->where($column, '=', $val);
			}
			})->first();

			// If the credentials match what is in the database we will just
			// log the user into the application and remember them if asked.
			$password = $arguments['password'];

			$password_field = Config::get('auth.password', 'password');

			if ( ! is_null($user) and Hash::check($password, $user->get_attribute($password_field)))
			{
				return $this->login($user->id, array_get($arguments, 'remember'));
			}

		return false;
	}

	/**
	 * Get a fresh model instance.
	 *
	 * @return Eloquent
	 */
	protected function model()
	{
		$model = Config::get('auth.model');

		return new $model;
	}

}