Add Send_Preview_Email class for MailPoet email editor

MAILPOET-6092

mailpoet/lib/DI/ContainerConfigurator.php

@@ -364,6 +364,7 @@ class ContainerConfigurator implements IContainerConfigurator {
     $container->autowire(\MailPoet\EmailEditor\Integrations\MailPoet\EmailApiController::class)->setPublic(true);
     $container->autowire(\MailPoet\EmailEditor\Integrations\MailPoet\Blocks\BlockTypesController::class)->setPublic(true);
     $container->autowire(\MailPoet\EmailEditor\Integrations\MailPoet\Blocks\BlockTypes\PoweredByMailpoet::class)->setPublic(true);
+    $container->autowire(\MailPoet\EmailEditor\Integrations\Utils\Send_Preview_Email::class)->setPublic(true);
     // Features
     $container->autowire(\MailPoet\Features\FeaturesController::class)->setPublic(true);
     $container->autowire(\MailPoet\Features\FeatureFlagsController::class)->setPublic(true);

packages/php/email-editor/src/Engine/class-email-api-controller.php

@@ -8,6 +8,7 @@
 declare(strict_types = 1);
 namespace MailPoet\EmailEditor\Engine;
 
+use MailPoet\EmailEditor\Integrations\Utils\Send_Preview_Email;
 use MailPoet\EmailEditor\Validator\Builder;
 use WP_Post;
 use WP_REST_Request;
@@ -17,6 +18,23 @@ use WP_REST_Response;
  * Class for email API controller.
  */
 class Email_Api_Controller {
+
+	/**
+	 * Property for the send preview email controller.
+	 *
+	 * @var Send_Preview_Email Send Preview controller.
+	 */
+	private Send_Preview_Email $send_Preview_Email;
+
+	/**
+	 * Email_Api_Controller constructor.
+	 */
+	public function __construct(
+		Send_Preview_Email $send_Preview_Email
+	) {
+		$this->send_Preview_Email = $send_Preview_Email;
+	}
+
 	/**
 	 * Returns email specific data.
 	 *
@@ -39,7 +57,12 @@ class Email_Api_Controller {
 
 	public function send_preview_email_data( WP_REST_Request $request ): WP_REST_Response {
 		$data = $request->get_params();
-		return new WP_REST_Response(['success' => true, 'data' => $data], 200);
+		try {
+			$result = $this->send_Preview_Email->sendPreviewEmail($data);
+			return new WP_REST_Response(['success' => true, 'result' => $result], 200);
+		} catch ( \Exception $exception ) {
+			return new WP_REST_Response(['error' => $exception->getMessage()], 400);
+		}
 	}
 
 	/**

packages/php/email-editor/src/Integrations/Utils/class-send-preview-email.php

@@ -0,0 +1,75 @@
+<?php
+/**
+ * This file is part of the MailPoet plugin.
+ *
+ * @package MailPoet\EmailEditor
+ */
+
+declare( strict_types = 1 );
+
+namespace MailPoet\EmailEditor\Integrations\Utils;
+
+use MailPoet\EmailEditor\Engine\Renderer\Renderer;
+
+class Send_Preview_Email {
+
+	private Renderer $renderer;
+
+	/**
+	 * Send_Preview_Email constructor.
+	 */
+	public function __construct(
+		Renderer $renderer
+	) {
+	$this->renderer = $renderer;
+	}
+
+	/**
+	 * Sends preview email
+	 * @throws \Exception
+	 */
+	public function sendPreviewEmail(array $data): bool {
+		$this->validateData($data);
+
+		$email = $data['email'];
+		$postId = $data['postId'];
+
+		$post = $this->fetchPost($postId);
+
+		$subject = $post->post_title;
+		$language = get_bloginfo('language');
+
+		$renderedData = $this->renderer->render(
+			$post,
+			$subject,
+			__('Preview', 'mailpoet'),
+			$language
+		);
+
+		$emailHtmlContent = $renderedData['html'];
+
+		return true;
+	}
+
+	private function validateData( array $data ) {
+		if ( empty( $data['email'] ) || empty( $data['postId'] ) ) {
+			throw new \InvalidArgumentException(__('Missing required data', 'mailpoet'));
+		}
+
+		if ( ! is_email( $data['email']) ) {
+			throw new \InvalidArgumentException(__('Invalid email', 'mailpoet'));
+		}
+	}
+
+	/**
+	 *
+	 * @throws \Exception
+	 */
+	private function fetchPost( $postId ): \WP_Post {
+		$post = get_post(intval($postId));
+		if (!$post instanceof \WP_Post) {
+			throw new \Exception(__('Invalid post', 'mailpoet'));
+		}
+		return $post;
+	}
+}