[#1258] Allow context['schema'] and skip validate in validate decorator

ckan/logic/__init__.py

@@ -502,13 +502,21 @@ def get_or_bust(data_dict, keys):
         return values[0]
     return tuple(values)
 
-def validate(schema_func):
+def validate(schema_func, check_schema_in_context=False, can_skip_validator=False):
     ''' A decorator that validates an action function against a given schema
     '''
     def action_decorator(action):
         @functools.wraps(action)
         def wrapper(context, data_dict, **kwargs):
-            schema = schema_func()
+            if can_skip_validator:
+                if context.get('skip_validation'):
+                    return action(context, data_dict)
+
+            if not check_schema_in_context:
+                schema = schema_func()
+            else:
+                schema = context.get('schema') or schema()
+
             data_dict, errors = _validate(data_dict, schema, context)
             if errors:
                 raise ValidationError(errors)