Move plugin files to a subfolder

[MAILPOET-3988]

mailpoet/lib/Mailer/Methods/ErrorMappers/SendGridMapper.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace MailPoet\Mailer\Methods\ErrorMappers;
+
+use MailPoet\Mailer\Mailer;
+use MailPoet\Mailer\MailerError;
+use MailPoet\Mailer\SubscriberError;
+use MailPoet\WP\Functions as WPFunctions;
+
+class SendGridMapper {
+  use BlacklistErrorMapperTrait;
+  use ConnectionErrorMapperTrait;
+
+  const METHOD = Mailer::METHOD_SENDGRID;
+
+  public function getErrorFromResponse($response, $subscriber) {
+    $response = (!empty($response['errors'][0])) ?
+      $response['errors'][0] :
+      sprintf(WPFunctions::get()->__('%s has returned an unknown error.', 'mailpoet'), Mailer::METHOD_SENDGRID);
+
+    $level = MailerError::LEVEL_HARD;
+    if (strpos($response, 'Invalid email address') === 0) {
+      $level = MailerError::LEVEL_SOFT;
+    }
+    $subscriberErrors = [new SubscriberError($subscriber, null)];
+    return new MailerError(MailerError::OPERATION_SEND, $level, $response, null, $subscriberErrors);
+  }
+}