5 files changed, 199 insertions, 13 deletions
diff --git a/phpBB/phpbb/controller/helper.php b/phpBB/phpbb/controller/helper.php
index 52e6947c2c..7ee90b10ba 100644
--- a/phpBB/phpbb/controller/helper.php
+++ b/phpBB/phpbb/controller/helper.php
@@ -184,6 +184,8 @@ class helper
 	* @param string $message The error message
 	* @param int $code The error code (e.g. 404, 500, 503, etc.)
 	* @return Response A Response instance
+	*
+	* @deprecated 3.1.3 (To be removed: 3.3.0) Use exceptions instead.
 	*/
 	public function error($message, $code = 500)
 	{
diff --git a/phpBB/phpbb/event/kernel_exception_subscriber.php b/phpBB/phpbb/event/kernel_exception_subscriber.php
index 44e87507f9..eb7831ad34 100644
--- a/phpBB/phpbb/event/kernel_exception_subscriber.php
+++ b/phpBB/phpbb/event/kernel_exception_subscriber.php
@@ -14,9 +14,10 @@
 namespace phpbb\event;
 
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\HttpFoundation\JsonResponse;
+use Symfony\Component\HttpKernel\Exception\HttpExceptionInterface;
 use Symfony\Component\HttpKernel\KernelEvents;
 use Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent;
-use Symfony\Component\HttpKernel\Exception\HttpException;
 use Symfony\Component\HttpFoundation\Response;
 
 class kernel_exception_subscriber implements EventSubscriberInterface
@@ -53,23 +54,55 @@ class kernel_exception_subscriber implements EventSubscriberInterface
 	*/
 	public function on_kernel_exception(GetResponseForExceptionEvent $event)
 	{
-		page_header($this->user->lang('INFORMATION'));
-
 		$exception = $event->getException();
 
-		$this->template->assign_vars(array(
-			'MESSAGE_TITLE'		=> $this->user->lang('INFORMATION'),
-			'MESSAGE_TEXT'		=> $exception->getMessage(),
-		));
+		$message = $exception->getMessage();
+
+		if ($exception instanceof \phpbb\exception\exception_interface)
+		{
+			$message = call_user_func_array(array($this->user, 'lang'), array_merge(array($message), $exception->get_parameters()));
+		}
+
+		if (!$event->getRequest()->isXmlHttpRequest())
+		{
+			page_header($this->user->lang('INFORMATION'));
+
+			$this->template->assign_vars(array(
+				'MESSAGE_TITLE' => $this->user->lang('INFORMATION'),
+				'MESSAGE_TEXT'  => $message,
+			));
+
+			$this->template->set_filenames(array(
+				'body' => 'message_body.html',
+			));
+
+			page_footer(true, false, false);
+
+			$response = new Response($this->template->assign_display('body'), 500);
+		}
+		else
+		{
+			$data = array();
+
+			if (!empty($message))
+			{
+				$data['message'] = $message;
+			}
+
+			if (defined('DEBUG'))
+			{
+				$data['trace'] = $exception->getTrace();
+			}
 
-		$this->template->set_filenames(array(
-			'body'	=> 'message_body.html',
-		));
+			$response = new JsonResponse($data, 500);
+		}
 
-		page_footer(true, false, false);
+		if ($exception instanceof HttpExceptionInterface)
+		{
+			$response->setStatusCode($exception->getStatusCode());
+			$response->headers->add($exception->getHeaders());
+		}
 
-		$status_code = $exception instanceof HttpException ? $exception->getStatusCode() : 500;
-		$response = new Response($this->template->assign_display('body'), $status_code);
 		$event->setResponse($response);
 	}
 
diff --git a/phpBB/phpbb/exception/exception_interface.php b/phpBB/phpbb/exception/exception_interface.php
new file mode 100644
index 0000000000..e8526a35f5
--- /dev/null
+++ b/phpBB/phpbb/exception/exception_interface.php
@@ -0,0 +1,29 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\exception;
+
+/**
+ * Interface exception_interface
+ *
+ * Define an exception which support a language var as message.
+ */
+interface exception_interface
+{
+	/**
+	 * Return the arguments associated with the message if it's a language var.
+	 *
+	 * @return array
+	 */
+	public function get_parameters();
+}
diff --git a/phpBB/phpbb/exception/http_exception.php b/phpBB/phpbb/exception/http_exception.php
new file mode 100644
index 0000000000..0e6ffe4f59
--- /dev/null
+++ b/phpBB/phpbb/exception/http_exception.php
@@ -0,0 +1,70 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\exception;
+
+use Symfony\Component\HttpKernel\Exception\HttpExceptionInterface;
+
+/**
+ * Class http_exception
+ */
+class http_exception extends runtime_exception implements HttpExceptionInterface
+{
+	/**
+	 * Http status code.
+	 *
+	 * @var integer
+	 */
+	private $status_code;
+
+	/**
+	 * Additional headers to set in the response.
+	 *
+	 * @var array
+	 */
+	private $headers;
+
+	/**
+	 * Constructor
+	 *
+	 * @param integer		$status_code	The http status code.
+	 * @param string		$message		The Exception message to throw (must be a language variable).
+	 * @param array			$parameters		The parameters to use with the language var.
+	 * @param \Exception	$previous		The previous exception used for the exception chaining.
+	 * @param array			$headers		Additional headers to set in the response.
+	 * @param integer		$code			The Exception code.
+	 */
+	public function __construct($status_code, $message = "", array $parameters = array(), \Exception $previous = null, array $headers = array(), $code = 0)
+	{
+		$this->status_code = $status_code;
+		$this->headers = $headers;
+
+		parent::__construct($message, $parameters, $previous, $code);
+	}
+
+	/**
+	 * {@inheritdoc}
+	 */
+	public function getStatusCode()
+	{
+		return $this->status_code;
+	}
+
+	/**
+	 * {@inheritdoc}
+	 */
+	public function getHeaders()
+	{
+		return $this->headers;
+	}
+}
diff --git a/phpBB/phpbb/exception/runtime_exception.php b/phpBB/phpbb/exception/runtime_exception.php
new file mode 100644
index 0000000000..6568bbf86f
--- /dev/null
+++ b/phpBB/phpbb/exception/runtime_exception.php
@@ -0,0 +1,52 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\exception;
+
+/**
+ * Class runtime_exception
+ *
+ * Define an exception which support a language var as message.
+ */
+class runtime_exception extends \RuntimeException implements exception_interface
+{
+	/**
+	 * Parameters to use with the language var.
+	 *
+	 * @var array
+	 */
+	private $parameters;
+
+	/**
+	 * Constructor
+	 *
+	 * @param string		$message	The Exception message to throw (must be a language variable).
+	 * @param array			$parameters	The parameters to use with the language var.
+	 * @param \Exception	$previous	The previous runtime_exception used for the runtime_exception chaining.
+	 * @param integer		$code		The Exception code.
+	 */
+	public function __construct($message = "", array $parameters = array(), \Exception $previous = null, $code = 0)
+	{
+		$this->parameters = $parameters;
+
+		parent::__construct($message, $code, $previous);
+	}
+
+	/**
+	 * {@inheritdoc}
+	 */
+	public function get_parameters()
+	{
+		return $this->parameters;
+	}
+}