refactor: Split FrontController into multiple classes

Closes #177

controllers/BaseController.php

@@ -0,0 +1,112 @@
+<?php
+/**
+ * BaseController class.
+ */
+
+namespace Alltube\Controller;
+
+use Alltube\Config;
+use Alltube\Video;
+use Aura\Session\Segment;
+use Aura\Session\SessionFactory;
+use Psr\Container\ContainerInterface;
+use Slim\Http\Request;
+use Slim\Http\Response;
+
+/**
+ * Abstract class used by every controller.
+ */
+abstract class BaseController
+{
+    /**
+     * Current video.
+     *
+     * @var Video
+     */
+    protected $video;
+
+    /**
+     * Default youtube-dl format.
+     *
+     * @var string
+     */
+    protected $defaultFormat = 'best[protocol=https]/best[protocol=http]';
+
+    /**
+     * Slim dependency container.
+     *
+     * @var ContainerInterface
+     */
+    protected $container;
+
+    /**
+     * Config instance.
+     *
+     * @var Config
+     */
+    protected $config;
+
+    /**
+     * Session segment used to store session variables.
+     *
+     * @var Segment
+     */
+    protected $sessionSegment;
+
+    /**
+     * BaseController constructor.
+     *
+     * @param ContainerInterface $container Slim dependency container
+     * @param array              $cookies   Cookie array
+     */
+    public function __construct(ContainerInterface $container, array $cookies = [])
+    {
+        $this->config = Config::getInstance();
+        $this->container = $container;
+        $session_factory = new SessionFactory();
+        $session = $session_factory->newInstance($cookies);
+        $this->sessionSegment = $session->getSegment(self::class);
+
+        if ($this->config->stream) {
+            $this->defaultFormat = 'best';
+        }
+    }
+
+    /**
+     * Get video format from request parameters or default format if none is specified.
+     *
+     * @param Request $request PSR-7 request
+     *
+     * @return string format
+     */
+    protected function getFormat(Request $request)
+    {
+        $format = $request->getQueryParam('format');
+        if (!isset($format)) {
+            $format = $this->defaultFormat;
+        }
+
+        return $format;
+    }
+
+    /**
+     * Get the password entered for the current video.
+     *
+     * @param Request $request PSR-7 request
+     *
+     * @return string Password
+     */
+    protected function getPassword(Request $request)
+    {
+        $url = $request->getQueryParam('url');
+
+        $password = $request->getParam('password');
+        if (isset($password)) {
+            $this->sessionSegment->setFlash($url, $password);
+        } else {
+            $password = $this->sessionSegment->getFlash($url);
+        }
+
+        return $password;
+    }
+}