Update bot.class.php

inc/bot.class.php

@@ -40,9 +40,22 @@ static public function setConfig($key, $value) {
    }
 
    static public function sendMessage($to, $content) {
-      $chat_id = self::getChatID($to);
-      $telegram = self::getTelegramInstance();
-      $result = Request::sendMessage(['chat_id' => $chat_id, 'text' => $content]);
+      global $DB;
+
+      $test_conn = self::isSiteAvailable("https://api.telegram.org/", 2) ? true : false;
+      if (!$test_conn) {
+         $logfile = GLPI_LOG_DIR."/telegrambot.log";
+         if (!file_exists($logfile)) {
+            $newfile = fopen($logfile, 'w+');
+            fclose($newfile); 
+         }
+         error_log(date("Y-m-d H:i:s")." - ERROR: Telegram API is unavailable now!\n", 3, $logfile);
+         return;
+      } else {
+         $chat_id = self::getChatID($to);
+         $telegram = self::getTelegramInstance();
+         $result = Request::sendMessage(['chat_id' => $chat_id, 'text' => $content]);
+      }
    }
 
    static public function getUpdates() {
@@ -102,4 +115,19 @@ static private function getDBCredentials() {
       );
    }
 
+   static private function isSiteAvailable($url, $timeout) {
+      if(!filter_var($url, FILTER_VALIDATE_URL)){
+        return false;
+      }
+
+      $curlInit = curl_init($url);
+      curl_setopt($curlInit,CURLOPT_CONNECTTIMEOUT,$timeout);
+      curl_setopt($curlInit,CURLOPT_HEADER,true);
+      curl_setopt($curlInit,CURLOPT_NOBODY,true);
+      curl_setopt($curlInit,CURLOPT_RETURNTRANSFER,true);
+      $response = curl_exec($curlInit);
+      curl_close($curlInit);
+      return $response ? true : false;
+    }
+
 }