openapi: remove body preprocessing

Body is already validated using jsonschema. There was also some type
casting but it was wrong: e.g. not recurring deeply into dicts and lists,
relying on existence of "type" in schema (which is not there e.g. if
oneOf is used). Anyway, the only reason why types should be casted is
converting integer values to float if the type is number. But this is in
most cases irrelevant.

Added an example, which did not work before this commit (echoed `{}`)
e.g. for
```
curl localhost:8080/api/foo -H 'content-type: application/json' -d
'{"foo": 1}'
```
but now the example works (echoes `{"foo": 1}`).

connexion/operations/openapi.py

@@ -10,6 +10,7 @@
 
 from ..decorators.uri_parsing import OpenAPIURIParser
 from ..utils import deep_get, deep_merge, is_null, is_nullable, make_type
+from ..http_facts import FORM_CONTENT_TYPES
 
 logger = logging.getLogger("connexion.operations.openapi3")
 
@@ -286,13 +287,28 @@ def _get_body_argument(self, body, arguments, has_kwargs, sanitize):
                           'the requestBody instead.', DeprecationWarning)
             x_body_name = sanitize(self.body_schema.get('x-body-name', 'body'))
 
+        if self.consumes[0] in FORM_CONTENT_TYPES:
+            return self._get_body_argument_form(x_body_name, body, arguments, has_kwargs, sanitize)
+        else:
+            return self._get_body_argument_json(x_body_name, body, arguments, has_kwargs, sanitize)
+
+    def _get_body_argument_json(self, x_body_name, body, arguments, has_kwargs, sanitize):
         # if the body came in null, and the schema says it can be null, we decide
         # to include no value for the body argument, rather than the default body
         if is_nullable(self.body_schema) and is_null(body):
             if x_body_name in arguments or has_kwargs:
                 return {x_body_name: None}
             return {}
 
+        if body is None:
+            default_body = self.body_schema.get('default', {})
+            body = deepcopy(default_body)
+
+        if x_body_name in arguments or has_kwargs:
+            return {x_body_name: body}
+        return {}
+
+    def _get_body_argument_form(self, x_body_name, body, arguments, has_kwargs, sanitize):
         # now determine the actual value for the body (whether it came in or is default)
         default_body = self.body_schema.get('default', {})
         body_props = {k: {"schema": v} for k, v
@@ -302,16 +318,6 @@ def _get_body_argument(self, body, arguments, has_kwargs, sanitize):
         # see: https://github.com/OAI/OpenAPI-Specification/blame/3.0.2/versions/3.0.2.md#L2305
         additional_props = self.body_schema.get("additionalProperties", True)
 
-        if body is None:
-            body = deepcopy(default_body)
-
-        # if the body isn't even an object, then none of the concerns below matter
-        if self.body_schema.get("type") != "object":
-            if x_body_name in arguments or has_kwargs:
-                return {x_body_name: body}
-            return {}
-
-        # supply the initial defaults and convert all values to the proper types by schema
         body_arg = deepcopy(default_body)
         body_arg.update(body or {})
 

examples/openapi3/oneof/oneof.py

@@ -0,0 +1,20 @@
+#!/usr/bin/env python3
+
+import connexion
+import jsonschema
+import six
+from connexion.decorators.validation import RequestBodyValidator
+from connexion.json_schema import Draft4RequestValidator
+
+async def echo(body):
+    return body
+
+if __name__ == '__main__':
+    app = connexion.AioHttpApp(
+        __name__,
+        port=8080,
+        specification_dir='.',
+        options={'swagger_ui': True}
+    )
+    app.add_api('schema.yaml')
+    app.run()

examples/openapi3/oneof/schema.yaml

@@ -0,0 +1,32 @@
+openapi: '3.0.0'
+info:
+  version: '1'
+  title: Custom Validator Example
+servers:
+  - url: http://localhost:8080/{basePath}
+    variables:
+      basePath:
+        default: api
+paths:
+  /echo:
+    post:
+      operationId: oneof.echo
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              type: object
+              additionalProperties: false
+              required:
+                - foo
+              properties:
+                foo:
+                  oneOf:
+                    - {type: boolean}
+                    - {type: number}
+              default:
+                foo: false
+      responses:
+        '200':
+          description: Echo the validated request.