use prepared request to format payload before converting

openapi_core/contrib/requests/requests.py

@@ -1,5 +1,8 @@
 """OpenAPI core contrib requests requests module"""
+from typing import Union
 from werkzeug.datastructures import ImmutableMultiDict
+from requests import Request, PreparedRequest
+from urllib.parse import urlparse, parse_qs
 
 from openapi_core.validation.request.datatypes import (
     RequestParameters, OpenAPIRequest,
@@ -9,26 +12,57 @@ from openapi_core.validation.request.datatypes import (
 class RequestsOpenAPIRequestFactory(object):
 
     @classmethod
-    def create(cls, request):
+    def create(cls, request: Union[Request, PreparedRequest]) -> OpenAPIRequest:
+        """
+        Converts a requests request to an OpenAPI one
+
+        Internally converts to a `PreparedRequest` first to parse the exact
+        payload being sent
+        """
+        if isinstance(request, Request):
+            request = request.prepare()
+
+        # Method
         method = request.method.lower()
 
-        cookie = request.cookies or {}
+        # Cookies
+        if request._cookies is not None:
+            # cookies are stored in a cookiejar object
+            cookie = request._cookies.get_dict()
+        else:
+            cookie = {}
+
+        # Preparing a request formats the URL with params, strip them out again
+        o = urlparse(request.url)
+        params = parse_qs(o.query)
+        # extract the URL without query parameters
+        url = o._replace(query=None).geturl()
 
         # gets deduced by path finder against spec
         path = {}
 
-        mimetype = request.headers.get('Accept') or \
-            request.headers.get('Content-Type')
+        # Order matters because all python requests issued from a session include
+        # Accept */* which does not necessarily match the content type
+        mimetype = request.headers.get('Content-Type') or \
+            request.headers.get('Accept')
+
+        # Headers - request.headers is not an instance of dict, which is expected
+        header = dict(request.headers)
+
+        # Body
+        # TODO: figure out if request._body_position is relevant
+        body = request.body
+
         parameters = RequestParameters(
-            query=ImmutableMultiDict(request.params),
-            header=request.headers,
+            query=ImmutableMultiDict(params),
+            header=header,
             cookie=cookie,
             path=path,
         )
         return OpenAPIRequest(
-            full_url_pattern=request.url,
+            full_url_pattern=url,
             method=method,
             parameters=parameters,
-            body=request.data,
+            body=body,
             mimetype=mimetype,
         )