Add endpoint-class factory based on PSR-11 container interface

[MAILPOET-4135]

mailpoet/lib/Automation/API/EndpointFactory.php

@@ -0,0 +1,25 @@
+<?php declare(strict_types = 1);
+
+namespace MailPoet\Automation\API;
+
+use MailPoet\InvalidStateException;
+use MailPoetVendor\Psr\Container\ContainerInterface;
+
+class EndpointFactory {
+  /** @var ContainerInterface */
+  private $container;
+
+  public function __construct(
+    ContainerInterface $container
+  ) {
+    $this->container = $container;
+  }
+
+  public function createEndpoint(string $class): Endpoint {
+    $endpoint = $this->container->get($class);
+    if (!$endpoint instanceof Endpoint) {
+      throw new InvalidStateException(sprintf("Class '%s' doesn't implement '%s'", $class, Endpoint::class));
+    }
+    return $endpoint;
+  }
+}

mailpoet/lib/DI/ContainerConfigurator.php

@@ -101,6 +101,9 @@ class ContainerConfigurator implements IContainerConfigurator {
     $container->autowire(\MailPoet\AutomaticEmails\WooCommerce\Events\PurchasedInCategory::class)->setPublic(true);
     $container->autowire(\MailPoet\AutomaticEmails\WooCommerce\Events\PurchasedProduct::class)->setPublic(true);
     // Automation
+    $container->autowire(\MailPoet\Automation\API\EndpointFactory::class)
+      ->setPublic(true)
+      ->setArgument('$container', new Reference(ContainerWrapper::class));
     $container->autowire(\MailPoet\Automation\Automation::class)->setPublic(true);
     // Config
     $container->autowire(\MailPoet\Config\AccessControl::class)->setPublic(true);