add checks for required curl extension

src/Monolog/Handler/IFTTTHandler.php

@@ -38,6 +38,10 @@ class IFTTTHandler extends AbstractProcessingHandler
      */
     public function __construct(string $eventName, string $secretKey, $level = Logger::ERROR, bool $bubble = true)
     {
+        if (!extension_loaded('curl')) {
+            throw new MissingExtensionException('The curl extension is needed to use the IFTTTHandler');
+        }
+
         $this->eventName = $eventName;
         $this->secretKey = $secretKey;
 

src/Monolog/Handler/SendGridHandler.php

@@ -59,6 +59,10 @@ class SendGridHandler extends MailHandler
      */
     public function __construct(string $apiUser, string $apiKey, string $from, $to, string $subject, $level = Logger::ERROR, bool $bubble = true)
     {
+        if (!extension_loaded('curl')) {
+            throw new MissingExtensionException('The curl extension is needed to use the SendGridHandler');
+        }
+
         parent::__construct($level, $bubble);
         $this->apiUser = $apiUser;
         $this->apiKey = $apiKey;

src/Monolog/Handler/SlackWebhookHandler.php

@@ -58,6 +58,10 @@ class SlackWebhookHandler extends AbstractProcessingHandler
         bool $bubble = true,
         array $excludeFields = array()
     ) {
+        if (!extension_loaded('curl')) {
+            throw new MissingExtensionException('The curl extension is needed to use the SlackWebhookHandler');
+        }
+
         parent::__construct($level, $bubble);
 
         $this->webhookUrl = $webhookUrl;

src/Monolog/Handler/TelegramBotHandler.php

@@ -90,6 +90,10 @@ class TelegramBotHandler extends AbstractProcessingHandler
         bool $disableWebPagePreview = null,
         bool $disableNotification = null
     ) {
+        if (!extension_loaded('curl')) {
+            throw new MissingExtensionException('The curl extension is needed to use the TelegramBotHandler');
+        }
+
         parent::__construct($level, $bubble);
 
         $this->apiKey = $apiKey;