Add support for One-Click unsubscribing according to RFC8058

src/Commands/DatabaseSeedCommand.php

@@ -47,6 +47,7 @@ protected function execute(InputInterface $input, OutputInterface $output): int
         $configValues = [
             ['default_mailer', 'Default Mailer', SmtpMailer::ALIAS, '', 'string'],
             [RtmClickReplace::CONFIG_NAME, 'Mail click tracker', false, '', 'boolean'],
+            ['enable_one_click_unsubscribing', 'Enable One-Click Unsubscribing', false, 'Add a header to emails that signals support for One-Click unsubscribe from the newsletter according to RFC 8058. The unsubscribe URL must support the POST method, must immediately unsubscribe the user from the newsletter, must not use redirection or any additional user verification; all the necessary data for unsubscribing must be part of the URL address.', 'boolean']
         ];
         foreach ($configValues as $configValue) {
             $config = $this->configsRepository->findBy('name', $configValue['0']);

src/Forms/ConfigFormFactory.php

@@ -123,7 +123,8 @@ public function create(): Form
                         break;
                     case Config::TYPE_BOOLEAN:
                         $othersContainer->addCheckbox($config['name'], $config['display_name'])
-                            ->setDefaultValue($config['value']);
+                            ->setDefaultValue($config['value'])
+                            ->setOption('description', $config['description']);
                         break;
                     case Config::TYPE_INT:
                         $othersContainer->addText($config['name'], $config['display_name'])

src/Models/Sender.php

@@ -9,6 +9,7 @@
 use Nette\Utils\Json;
 use Psr\Log\LoggerInterface;
 use Remp\MailerModule\Models\Auth\AutoLogin;
+use Remp\MailerModule\Models\Config\Config;
 use Remp\MailerModule\Models\Config\ConfigNotExistsException;
 use Remp\MailerModule\Models\ContentGenerator\ContentGenerator;
 use Remp\MailerModule\Models\ContentGenerator\GeneratorInputFactory;
@@ -40,7 +41,8 @@ public function __construct(
         private ContentGenerator $contentGenerator,
         private GeneratorInputFactory $generatorInputFactory,
         private ServiceParamsProviderInterface $serviceParamsProvider,
-        private EmailAllowList $emailAllowList
+        private EmailAllowList $emailAllowList,
+        private Config $config
     ) {
     }
 
@@ -350,18 +352,28 @@ private function setMessageAttachments(Message $message): ?int
 
     private function setMessageHeaders(Message $message, $mailSenderId, ?array $templateParams, bool $isBatch = false): void
     {
+        $enableOneClickUnsubscribing = $this->config->get('enable_one_click_unsubscribing');
         if (!$this->template->mail_type->locked) {
             if ($isBatch) {
                 $message->setHeader('List-Unsubscribe', '%recipient.list_unsubscribe%');
+                if ($enableOneClickUnsubscribing) {
+                    $message->setHeader('List-Unsubscribe-Post', '%recipient.list_unsubscribe_post%');
+                }
                 foreach ($templateParams as $email => $variables) {
                     if (isset($variables['unsubscribe'])) {
                         $templateParams[$email]['list_unsubscribe'] = "<{$variables['unsubscribe']}>";
+                        if ($enableOneClickUnsubscribing) {
+                            $templateParams[$email]['list_unsubscribe_post'] = 'List-Unsubscribe=One-Click';
+                        }
                     }
                 }
             } else {
                 foreach ($templateParams as $email => $variables) {
                     if (isset($variables['unsubscribe'])) {
                         $message->setHeader('List-Unsubscribe', "<{$variables['unsubscribe']}>");
+                        if ($enableOneClickUnsubscribing) {
+                            $message->setHeader('List-Unsubscribe-Post', 'List-Unsubscribe=One-Click');
+                        }
                     }
                 }
             }