trigger: initial custom git trigger

endpoints/webhooks.py

@@ -9,7 +9,7 @@ from auth.permissions import ModifyRepositoryPermission
 from util.invoice import renderInvoiceToHtml
 from util.useremails import send_invoice_email, send_subscription_change, send_payment_failed
 from util.http import abort
-from endpoints.trigger import BuildTrigger, ValidationRequestException, SkipRequestException
+from endpoints.trigger import BuildTrigger, ValidationRequestException, SkipRequestException, InvalidPayloadException
 from endpoints.common import start_build
 
 
@@ -88,14 +88,15 @@ def build_trigger_webhook(trigger_uuid, **kwargs):
     try:
       specs = handler.handle_trigger_request(request, trigger)
       dockerfile_id, tags, name, subdir, metadata = specs
-
     except ValidationRequestException:
       # This was just a validation request, we don't need to build anything
       return make_response('Okay')
-
     except SkipRequestException:
       # The build was requested to be skipped
       return make_response('Okay')
+    except InvalidPayloadException:
+      # The payload was malformed
+      abort(400)
 
     pull_robot_name = model.get_pull_robot_name(trigger)
     repo = model.get_repository(namespace, repository)