server/api: output JSON for HTTP 405

server/szurubooru/app.py

@@ -1,5 +1,6 @@
 ''' Exports create_app. '''
 
+import json
 import falcon
 from szurubooru import api, errors, middleware
 
@@ -23,8 +24,23 @@ def _on_not_found_error(ex, _request, _response, _params):
 def _on_processing_error(ex, _request, _response, _params):
     raise falcon.HTTPBadRequest(title='Processing error', description=str(ex))
 
+def create_method_not_allowed(allowed_methods):
+    allowed = ', '.join(allowed_methods)
+
+    def method_not_allowed(request, response, **kwargs):
+        response.status = falcon.status_codes.HTTP_405
+        response.set_header('Allow', allowed)
+        request.context.output = {
+            'title': 'Method not allowed',
+            'description': 'Allowed methods: %r' % allowed_methods,
+        }
+
+    return method_not_allowed
+
 def create_app():
     ''' Create a WSGI compatible App object. '''
+    falcon.responders.create_method_not_allowed = create_method_not_allowed
+
     app = falcon.API(
         request_type=api.Request,
         middleware=[

server/szurubooru/middleware/context_adapter.py

@@ -21,6 +21,7 @@ class ContextAdapter(object):
     def process_request(self, request, _response):
         request.context.files = {}
         request.context.input = {}
+        request.context.output = None
         # pylint: disable=protected-access
         for key, value in request._params.items():
             request.context.input[key] = value
@@ -53,14 +54,12 @@ class ContextAdapter(object):
             for key, value in json.loads(body).items():
                 request.context.input[key] = value
         except (ValueError, UnicodeDecodeError):
-            raise falcon.HTTPError(
-                falcon.HTTP_401,
+            raise falcon.HTTPBadRequest(
                 'Malformed JSON',
                 'Could not decode the request body. The '
                 'JSON was incorrect or not encoded as UTF-8.')
 
     def process_response(self, request, response, _resource):
-        if not request.context.output:
-            return
-        response.body = json.dumps(
-            request.context.output, default=json_serializer, indent=2)
+        if request.context.output:
+            response.body = json.dumps(
+                request.context.output, default=json_serializer, indent=2)