Add Session Management instances (including Depenency Injection)

- Prerequesite for mocking Sessions
- Reduce "App" class complexity

src/Factory/SessionFactory.php

@@ -0,0 +1,79 @@
+<?php
+
+namespace Friendica\Factory;
+
+use Friendica\App;
+use Friendica\Core\Cache\Cache;
+use Friendica\Core\Cache\ICache;
+use Friendica\Core\Config\Configuration;
+use Friendica\Core\Session\CacheSession;
+use Friendica\Core\Session\DatabaseSession;
+use Friendica\Core\Session\ISession;
+use Friendica\Core\Session\Memory;
+use Friendica\Core\Session\MemorySession;
+use Friendica\Core\Session\NativeSession;
+use Friendica\Core\System;
+use Friendica\Database\Database;
+use Friendica\Model\User\Cookie;
+use Friendica\Util\Profiler;
+use Psr\Log\LoggerInterface;
+
+class SessionFactory
+{
+	/** @var string The plain, PHP internal session management */
+	const INTERNAL = 'native';
+	/** @var string Using the database for session management */
+	const DATABASE = 'database';
+	/** @var string Using the cache for session management */
+	const CACHE = 'cache';
+	/** @var string A temporary cached session */
+	const MEMORY  = 'memory';
+	/** @var string The default type for Session management in case of no config */
+	const DEFAULT = self::DATABASE;
+
+	/**
+	 * @param App\Mode        $mode
+	 * @param Configuration   $config
+	 * @param Cookie          $cookie
+	 * @param Database        $dba
+	 * @param ICache          $cache
+	 * @param LoggerInterface $logger
+	 * @param array           $server
+	 *
+	 * @return ISession
+	 */
+	public function createSession(App\Mode $mode, Configuration $config, Cookie $cookie, Database $dba, ICache $cache, LoggerInterface $logger, Profiler $profiler, array $server = [])
+	{
+		$stamp1  = microtime(true);
+		$session = null;
+
+		try {
+			if ($mode->isInstall() || $mode->isBackend()) {
+				$session = new MemorySession();
+			} else {
+				$session_handler = $config->get('system', 'session_handler', self::DEFAULT);
+
+				switch ($session_handler) {
+					case self::INTERNAL:
+						$session = new NativeSession($config, $cookie);
+						break;
+					case self::DATABASE:
+					default:
+						$session = new DatabaseSession($config, $cookie, $dba, $logger, $server);
+						break;
+					case self::CACHE:
+						// In case we're using the db as cache driver, use the native db session, not the cache
+						if ($config->get('system', 'cache_driver') === Cache::TYPE_DATABASE) {
+							$session = new DatabaseSession($config, $cookie, $dba, $logger, $server);
+						} else {
+							$session = new CacheSession($config, $cookie, $cache, $logger, $server);
+						}
+						break;
+				}
+			}
+		} finally {
+			$profiler->saveTimestamp($stamp1, 'parser', System::callstack());
+			return $session;
+		}
+	}
+}