allow exception to change the error code from the exception code

src/core/Directus/Application/ErrorHandlers/ErrorHandler.php

@@ -7,6 +7,7 @@
 use Directus\Database\Exception\InvalidQueryException;
 use Directus\Exception\BadRequestException;
 use Directus\Exception\ErrorException;
+use Directus\Exception\Exception;
 use Directus\Exception\ForbiddenException;
 use Directus\Exception\NotFoundException;
 use Directus\Exception\UnauthorizedException;
@@ -82,13 +83,18 @@ public function processException($exception)
         $this->trigger($exception);
 
         $message = $exception->getMessage();
+        $code = null;
         // Not showing internal PHP errors (for PHP7) for production
         if ($productionMode && $this->isError($exception)) {
             $message = 'Internal Server Error';
         } else if (empty($message)) {
             $message = 'Unknown Error';
         }
 
+        if ($exception instanceof Exception) {
+            $code = $exception->getErrorCode();
+        }
+
         $httpStatusCode = 500;
         if ($exception instanceof BadRequestException) {
             $httpStatusCode = 400;
@@ -101,7 +107,7 @@ public function processException($exception)
         }
 
         $data = [
-            'code' => $exception->getCode(),
+            'code' => $code,
             'message' => $message
         ];
 

src/core/Directus/Exception/Exception.php

@@ -5,4 +5,14 @@
 class Exception extends \Exception
 {
     const ERROR_CODE = 0;
+
+    /**
+     * Allows child class to extend the error code value method
+     *
+     * @return int
+     */
+    public function getErrorCode()
+    {
+        return static::ERROR_CODE;
+    }
 }