Fix multi part request

Author: catalinsymphony

symphony/bdk/gen/api_client.py

@@ -21,6 +21,8 @@
 import mimetypes
 import os
 import re
+
+from urllib3.fields import RequestField
 import tempfile
 
 from urllib.parse import quote
@@ -216,6 +218,9 @@ def param_serialize(
             )
             if files:
                 post_params.extend(self.files_parameters(files))
+            if header_params['Content-Type'].startswith("multipart"):
+                post_params = self.parameters_to_multipart(post_params,
+                                                           (dict))
 
         # auth setting
         self.update_params_for_auth(
@@ -286,6 +291,28 @@ async def call_api(
 
         return response_data
 
+    def parameters_to_multipart(self, params, collection_types):
+        """Get parameters as list of tuples, formatting as json if value is collection_types
+
+        :param params: Parameters as list of two-tuples
+        :param dict collection_types: Parameter collection types
+        :return: Parameters as list of tuple or urllib3.fields.RequestField
+        """
+        new_params = []
+        if collection_types is None:
+            collection_types = (dict)
+        for k, v in params.items() if isinstance(params, dict) else params:  # noqa: E501
+            if isinstance(v, collection_types): # v is instance of collection_type, formatting as application/json
+                v = json.dumps(v, ensure_ascii=False).encode("utf-8")
+                field = RequestField(k, v)
+                field.make_multipart(content_type="application/json; charset=utf-8")
+                new_params.append(field)
+            elif isinstance(v, str):
+                params.append((k, (v, "text/plain; charset=utf-8")))
+            else:
+                new_params.append((k, v))
+        return new_params
+
     def response_deserialize(
         self,
         response_data: rest.RESTResponse,

symphony/bdk/gen/rest.py

@@ -183,6 +183,9 @@ async def request(
                             filename=v[0],
                             content_type=v[2]
                         )
+                    elif isinstance(v, tuple) and len(v) == 2:
+                        # needed because of multipart form data payload while sending messages with attachment
+                        data.add_field(k, v[0], content_type=v[1])
                     else:
                         data.add_field(k, v)
                 args["data"] = data