REST: add restbase compat error handling mode

In order to replace certain /api/rest_v1 endpoints, we
need to have something in MediaWiki that generates a compatible
responser. The MediaWiki REST API error format does not match
RESTbase. So the easiest approach seemed to be to
add a compatibility mode, triggered using the x-restbase-compat
header. This can be set via the gateway when rerouting the request.

Bug: T374136
Change-Id: I73934940d367be52941bd27861c248ab5bcfb5d2

1 files changed, 7 insertions, 1 deletions

diff --git a/includes/Rest/Module/Module.php b/includes/Rest/Module/Module.php
index dcfc01af4550..46d73b0b7e18 100644
--- a/includes/Rest/Module/Module.php
+++ b/includes/Rest/Module/Module.php
@@ -268,7 +268,13 @@ abstract class Module {
 
 			$response = $this->executeHandler( $handler );
 		} catch ( HttpException $e ) {
-			$response = $this->responseFactory->createFromException( $e );
+			$extraData = [];
+			if ( $this->router->isRestbaseCompatEnabled( $request )
+				&& $e instanceof LocalizedHttpException
+			) {
+				$extraData = $this->router->getRestbaseCompatErrorData( $request, $e );
+			}
+			$response = $this->responseFactory->createFromException( $e, $extraData );
 		} catch ( Throwable $e ) {
 			// Note that $handler is allowed to be null here.
 			$this->errorReporter->reportError( $e, $handler, $request );