Add Doctrine Connection factory

[MAILPOET-2014]

lib/Doctrine/ConnectionFactory.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace MailPoet\Doctrine;
+
+use MailPoet\Config\Env;
+use MailPoetVendor\Doctrine\DBAL\Configuration;
+use MailPoetVendor\Doctrine\DBAL\DriverManager;
+use MailPoetVendor\Doctrine\DBAL\Platforms\MySqlPlatform;
+
+class ConnectionFactory {
+  const DRIVER = 'pdo_mysql';
+  const PLATFORM_CLASS = MySqlPlatform::class;
+
+  function createConnection() {
+    $platform_class = self::PLATFORM_CLASS;
+    $connection_params = [
+      'driver' => self::DRIVER,
+      'platform' => new $platform_class,
+      'host' => Env::$db_host,
+      'port' => Env::$db_port,
+      'socket' => Env::$db_socket,
+      'user' => Env::$db_username,
+      'password' => Env::$db_password,
+      'charset' => Env::$db_charset,
+      'dbname' => Env::$db_name,
+    ];
+    return DriverManager::getConnection($connection_params);
+  }
+}