Initial import of tasks application

This initial import is a heavily modified version of the code I had
here, as Arse was modified for other purposes in the meantime and the
application no longer worked with it.

In addition:
 * I did not import the user management part yet,
 * task dependencies are supported in-base, but there is no interface
for that yet.

includes/t-basics/controllers.inc.php

@@ -0,0 +1,121 @@
+<?php
+
+
+class Ctrl_HomePage
+	extends Controller
+{
+
+	public final function handle( Page $page )
+	{
+		session_start( );
+		if (  array_key_exists( 'uid' , $_SESSION ) ) {
+			return 'items';
+		} else {
+			return 'login';
+		}
+	}
+
+}
+
+
+class Ctrl_Logout
+	extends Controller
+{
+
+	public function handle( Page $page )
+	{
+		session_start( );
+		session_destroy( );
+		return 'home';
+	}
+
+}
+
+
+
+class Ctrl_CheckSession
+	extends Controller
+{
+	private $loginURL;
+	private $sessionKey;
+
+	public function __construct( $url = 'login' , $key = 'uid' )
+	{
+		$this->loginURL = $url;
+		$this->sessionKey = $key;
+	}
+
+
+	public function handle( Page $page )
+	{
+		session_start( );
+		if ( array_key_exists( $this->sessionKey , $_SESSION ) ) {
+			return null;
+		}
+		return $this->loginURL;
+	}
+}
+
+
+class Ctrl_LogInForm
+	extends Controller
+{
+
+	public function handle( Page $page )
+	{
+		return Loader::Create( 'Form' , 'Log in' , 'login' )
+			->addField( Loader::Create( 'Field' , 'email' , 'text' )
+					->setDescription( 'E-mail address:' ) )
+			->addField( Loader::Create( 'Field' , 'pass' , 'password' )
+					->setDescription( 'Password:' ) )
+			->setSuccessURL( 'home' )
+			->addController( Loader::Ctrl( 'log_in' ) )
+			->controller( );
+	}
+
+}
+
+
+class Ctrl_LogIn
+	extends Controller
+	implements FormAware
+{
+
+	private $form;
+
+	public function setForm( Form $form )
+	{
+		$this->form = $form;
+	}
+
+	public function handle( Page $page )
+	{
+		$email = $this->form->field( 'email' );
+		$pass = $this->form->field( 'pass' );
+
+		$user = Loader::DAO( 'users' )->checkLogin( $email->value( ) , $pass->value( ) );
+		if ( $user == null ) {
+			$email->putError( 'Invalid credentials.' );
+			return null;
+		}
+
+		$_SESSION[ 'uid' ] = $user->user_id;
+		return true;
+	}
+}
+
+
+class Ctrl_LoggedOut
+	extends Controller
+{
+
+	public function handle( Page $page )
+	{
+		session_start( );
+		if ( array_key_exists( 'uid' , $_SESSION ) ) {
+			return 'home';
+		}
+		return null;
+	}
+
+}